Pressure gauge with built-in heating diaphragm

Abstract

The invention relates to a pressure gauge with a built-in heat compensation diaphragm, and the pressure gauge comprises a pressure gauge housing which comprises a pressure connection region, a heat compensation region, and a pressure detection region. The pressure transmission mechanism comprises a pressure transmission valve plate which is in sliding sealing connection with the bottom of the shell; the heat compensation area is located between the detection area and the connection area; the pressure detection mechanism is located in the detection area and comprises a connecting frame fixed to the top of the shell and a plurality of strain gauge assemblies; the strain gauge assembly comprises an elastic supporting sheet and a pressure strain gauge which are symmetrical, the middle of the supporting sheet is provided with an arc-shaped protrusion located in the heat compensation area, the strain gauge comprises a strain part and a compensation part, the strain part is provided with a strain resistance circuit, the compensation part is provided with a compensation resistance circuit, the end of the supporting sheet clamps the strain part, one end of the supporting sheet is embedded into the transfer valve plate, and the other end of the supporting sheet is embedded into the connecting frame; the heat compensation mechanism comprises a top compensator and a bottom heat compensation device; the top compensator comprises a first heat compensation body penetrating through the connecting frame; the bottom heat supplementing device comprises a second heat supplementing body penetrating through the shell, and a heat supplementing area is filled with heat conduction liquid.

Description

Technical Field

[0001] The present invention relates to a pressure gauge with a built-in heat compensation diaphragm, belonging to the field of pressure monitoring devices. Background Art

[0002] The pressure liquid of the pressure gauge will affect the strain curves of the pressure transmission mechanism and the pressure sensing mechanism due to low temperature. At the same time, low temperature will also have a certain internal pressure impact on the internal chamber of the pressure gauge, thereby affecting the accuracy of the pressure gauge data. In current technology, pressure values are converted according to different liquid temperatures. However, the influence indexes of temperature on each part of the pressure gauge are numerous, and it is difficult to obtain accurate pressure values only through conversion. Moreover, in extremely low temperature environments, traditional pressure gauges may directly malfunction. In the prior art, a heat compensation mechanism is set inside the pressure gauge to heat the pressure gauge, but it is difficult for the heat compensation unit to ensure the uniformity of the temperature inside the entire pressure gauge. The uneven temperature will still affect the accuracy of the pressure, and the pressure transmission mechanism cannot be heated either. 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 pressure gauge with a built-in heat compensation diaphragm.

[0004] The technical solution adopted by the present invention to solve its technical problems is: A pressure gauge with a built-in heat compensation diaphragm, comprising: A pressure gauge housing, which includes a pressure connection area, a heat compensation area, and a pressure detection area. The pressure connection area is hermetically connected to the pressure source, and the pressure of the pressure source is transmitted through a pressure transmission mechanism. The pressure detection area is connected to the pressure connection area, and a pressure detection mechanism is arranged in the pressure detection area to detect the transmitted pressure. The heat compensation area is filled with a heat-conducting liquid; A pressure transmission mechanism, which includes a pressure transmission valve plate that is slidably and hermetically connected to the bottom of the pressure gauge housing; the heat compensation area is arranged between the pressure detection area and the pressure connection area, and a compensator is further connected to the heat compensation area, and a compensation cavity communicating with the heat compensation area is arranged inside the compensator; A pressure detection mechanism, which is located in the pressure detection area. The pressure detection mechanism includes a connection frame fixed to the top of the pressure gauge housing; the pressure detection mechanism further includes a plurality of strain gauge assemblies. The strain gauge assembly includes two groups of symmetrically arranged elastic support sheets and pressure strain gauges. An arc-shaped protrusion is arranged in the middle of the elastic support sheet, and the arc-shaped protrusion is arranged in the heat compensation area. The pressure strain gauge includes a strain part and a compensation part. A strain resistance circuit is arranged in the strain part, and a compensation resistance circuit is arranged in the compensation part. The strain part of the pressure strain gauge is clamped and connected between the ends of the elastic support sheet. One end of the elastic support sheet is embedded in the pressure transmission valve plate, and the other end is embedded in the connection frame. The compensation part of the pressure strain gauge is fixed through a strain gauge clamping groove arranged on the connection frame; Heat supplement mechanism, the heat supplement mechanism includes a top compensator and a bottom heat supplementer. The top compensator includes a first heat supplement body penetrating through the connecting frame. The first heat supplement body adjusts the temperature of the compensation part of the pressure strain gauge through the heat conduction of the connecting frame. The bottom heat supplementer includes a second heat supplement body penetrating through the pressure gauge housing in the heat supplement area. A heat-conducting liquid is filled in the heat supplement area, and the second heat supplement body adjusts the temperature of the heat-conducting liquid; The pressure strain gauge is pre-tightened by an array of elastic support sheets. The pre-tightened pressure strain gauge ensures the sensitivity of pressure strain. At the same time, each group of strain gauges has its own compensation part. While accurately measuring temperature through the compensation part, the temperature control of the heat supplement for the pressure strain gauge can be accurately carried out; and the elastic support sheet that can change the pressure curve with temperature can accurately control the strain curve through the heat supplement mechanism, improving the accuracy rate.

[0005] As a further improvement of the present invention, a number of top clamping grooves are arranged in an array on the connecting frame. The strain gauge clamping groove communicates with the top clamping groove. A number of bottom clamping grooves are arranged in an array on the pressure transmission valve plate; the top of the pressure detection area of the pressure strain gauge is clamped and fixed to the top clamping groove through the top of the elastic support sheet, and the bottom of the pressure detection area of the pressure strain gauge is clamped and fixed to the bottom clamping groove through the bottom of the elastic support sheet; The strain gauge is fixed by clamping. Compared with forms such as bonding fixation, mechanical fixation has no adhesives or intermediates, is not easily affected by temperature, has high stability and high accuracy.

[0006] As a further improvement of the present invention, a first through hole is arranged in the middle of the pressure detection area of the pressure strain gauge. The strain resistance circuit of the pressure strain gauge is arranged around the outer circle of the first through hole. A third through hole is arranged in the middle of the elastic support sheet; wherein, the second heat supplement body penetrates through the first through hole and the third through hole; the diameter of the second heat supplement body is less than 80% of the diameters of the first through hole and the third through hole; The second heat supplement body penetrates through the pressure strain gauge and the elastic support sheet, ensuring that the temperature distribution gradient is distributed from the middle of the pressure strain gauge and the elastic support sheet to both sides, ensuring the uniformity of the heat supplement of the heat supplement body to the pressure strain gauge and the elastic support sheet, and ensuring the accuracy of the pressure data.

[0007] As a further improvement of the present invention, a second through hole is arranged on the compensation part of the pressure strain gauge. The compensation resistance circuit of the pressure strain gauge is arranged around the outer circle of the second through hole; wherein, the first heat supplement body penetrates through the second through hole.

[0008] The first heat supplement body penetrates through the pressure strain gauge, ensuring that the temperature distribution gradient is distributed from the middle of the pressure strain gauge to both sides, and ensuring the uniformity of the heat supplement of the heat supplement body to the pressure strain gauge.

[0009] As a further improvement of the present invention, a plurality of heat-conducting protrusions integrated with the strain resistance circuit and the compensation resistance circuit are provided at the top ends of the strain resistance circuit and the compensation resistance circuit of the pressure strain gauge corresponding to the positions of the second vias.

[0010] The heating area of the strain resistance circuit and the compensation resistance circuit is increased, ensuring temperature consistency and uniformity.

[0011] As a further improvement of the present invention, a plurality of clamping mechanisms are arranged in a linear array within the connecting frame. Each clamping mechanism includes two groups of clamping blocks. A clamping hole is provided within the connecting frame, and the two groups of clamping blocks are symmetrically fixed within the same group of clamping holes; The clamping mechanism realizes clamping through the combination of the clamping hole and the clamping blocks. The combination is more convenient and easy to disassemble and maintain.

[0012] As a further improvement of the present invention, two groups of floating diaphragms with a wavy structure are inlaid and fixed on the side wall of the pressure transmission valve plate. The outer ring of the floating diaphragm is embedded into the inner wall of the pressure gauge housing; a circular sealing ring is also provided at the edge of the pressure transmission valve plate, and the sealing ring is in sliding sealing contact with the inner wall of the pressure gauge housing; The pressure transmission valve plate uses the floating diaphragm for liquid isolation and uses the sealing ring for sliding support, reducing the possibility of the measured pressure fluid flowing into the heat-conducting liquid.

[0013] As a further improvement of the present invention, two groups of second sealing blocks are fixed to the middle side wall of the pressure gauge housing by means of threads. The two groups of second sealing blocks are arranged coaxially. A second heat-conducting sleeve is provided outside the second heat-supplementing body, and both ends of the second heat-supplementing body are fixed to the middle of the first sealing block through the second heat-conducting sleeve; a second sealing groove is provided at one axial end of the second sealing block, and a second sealing cover is fixed in the second sealing groove by means of threads. A second plug for connecting to the second heat-supplementing body is provided at the end of the second sealing cover; two groups of socket connectors are fixed to the two axial ends of the connecting frame, and two groups of first sealing blocks are fixed to the top side wall of the pressure gauge housing by means of threads. The front end of the first sealing block is inserted into the socket connector. A first heat-conducting sleeve is provided outside the first heat-supplementing body, and both ends of the first heat-supplementing body are fixed to the middle of the first sealing block through the first heat-conducting sleeve. A first sealing groove is provided at one axial end of the first sealing block, and a first sealing cover is fixed in the first sealing groove by means of threads. A first plug for connecting to the first heat-supplementing body is provided at the end of the first sealing cover; The second heat-supplementing body is fixed using a secondary nested thread structure, improving the sealing and pressure resistance effects and being easy to disassemble and maintain; the combination of the socket connector of the first heat-supplementing body and the first sealing block can not only assist in fixing the connecting frame, reducing the burden on the heat-supplementing body caused by the self-weight of the connecting frame, but also improve the sealing and pressure resistance effects.

[0014] As a further improvement of the present invention, the compensator includes a compensation bottle, which is connected to the pressure gauge housing at the heat compensation area through a rigid pipeline. A floating piston is slidably connected inside the compensation bottle. A pressure valve is arranged at the top of the compensation bottle. The compensation chamber is located between the floating piston and the compensation bottle. A low-pressure spring is also arranged between the top of the compensation bottle and the floating piston; The air pressure inside the compensation bottle can provide a relatively stable driving pressure for the heat-conducting liquid and can provide compensation for the floating of the heat-conducting liquid; while the low-pressure spring can not only assist the air pressure inside the compensation bottle to ensure the linearity of the compression curve of the floating piston, but also ensure a certain driving pressure for the heat-conducting liquid in case of pressure leakage.

[0015] As a further improvement of the present invention, the two ends of the strain resistance circuit and the compensation resistance circuit extend towards the top of the pressure strain gauge; several U-shaped elastic bending parts are arranged on the strain resistance circuit; The two ends of the strain resistance circuit and the compensation resistance circuit extend towards the top, so that the pins of the strain resistance circuit and the compensation resistance circuit can be led out towards the top of the entire pressure gauge, saving the bottom space and preventing the pollution of the wiring socket caused by setting up a wiring mechanism at the pressure source position. And the bending parts increase the sensitivity of the strain resistance circuit.

[0016] The beneficial effects of the present invention are: The present invention pre-tightens the pressure strain gauge through the elastically supported sheets arranged in an array. The pre-tightened pressure strain gauge ensures the sensitivity of the pressure strain. At the same time, each group of strain gauges has its own compensation part. While accurately measuring the temperature through the compensation part, the heat compensation of the pressure strain gauge can be accurately controlled; and the elastically supported sheets that can change the pressure curve with temperature can accurately control the strain curve through the heat compensation mechanism, improving the accuracy rate. Description of the Drawings

[0017] The present invention will be further described below in conjunction with the drawings and embodiments.

[0018] Figure 1 is a schematic cross-sectional view of the present invention; Figure 2 is a schematic structural view of the connecting frame; Figure 3 is a schematic structural view of the pressure strain gauge.

[0019] In the figure: 1, pressure gauge housing; 2, pressure connection area; 3, floating frame; 4, first compression ring; 5, second compression ring; 6, limit ring; 7, floating diaphragm; 8, sealing ring; 9, bottom sealing plate; 10, pressure connection nozzle; 11, pressure transmission valve plate; 12, bottom clamping groove; 13, sealing piece; 14, heat compensation area; 15, connecting frame; 16, socket; 17, clamping block; 18, strain gauge clamping groove; 19, top clamping groove; 20, compensation part; 21, strain part; 22, elastic support piece; 23, insertion hole; 24, terminal block; 25, top sealing plate; 26, hub; 27, external interface; 28, second sealing block; 29, second sealing cover; 30, second plug; 31, second heat compensation body; 32, second heat conducting sleeve; 33, first sealing block; 34, first plug; 35, copper pipe; 36, compensation bottle; 37, floating piston; 38, compensation cavity; 39, low-pressure spring; 40, pressure valve; 41, strain resistance circuit; 42, elastic bending part; 43, first through hole; 44, compensation resistance circuit; 45, second through hole; 46, heat conducting protrusion. Detailed implementation manners

[0020] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0021] A pressure gauge with an internally built heat compensation diaphragm, comprising: As Figure 1 , a pressure gauge housing 1, the pressure gauge housing 1 includes a pressure connection area 2, a heat compensation area 14 and a pressure detection area. The pressure connection area 2 is hermetically connected to a pressure source, and the pressure of the pressure source is transmitted through a pressure transmission mechanism. The pressure detection area is connected to the pressure connection area 2, and a pressure detection mechanism is arranged in the pressure detection area for detecting the transmitted pressure.

[0022] As Figure 1, Pressure transmission mechanism. An annular limit ring 6 is provided at the bottom of the pressure gauge housing 1. A floating frame 3 is arranged at the position corresponding to the pressure connection area 2 at the bottom of the pressure gauge housing 1 through the limit ring 6. A first pressure ring 4 and a second pressure ring 5 are successively arranged between the floating frame 3 and the limit ring 6. Two sets of floating diaphragms 7 with a wavy structure are arranged between the top of the floating frame 3 and the first pressure ring 4, and between the first pressure ring 4 and the second pressure ring 5. The pressure transmission mechanism includes a pressure transmission valve plate 11 that is slidably and hermetically connected to the bottom of the pressure gauge housing 1. The inner ring of the floating diaphragm 7 is embedded in the pressure transmission valve plate 11. An annular sealing ring 8 is also arranged at the edge of the pressure transmission valve plate 11 corresponding to the position between the two sets of floating diaphragms 7. The sealing ring 8 is in slidable and hermetic contact with the inner wall of the floating frame 3; A bottom sealing plate 9 is also fixed to the bottom of the pressure gauge housing 1 through a flange. The floating frame 3, the first pressure ring 4, and the second pressure ring 5 are pressed between the bottom sealing plate 9 and the limit ring 6. A pressure connection nozzle 10 is connected to the middle of the bottom sealing plate 9. The pressure connection nozzle 10 is connected to the pressure output pipeline through a tee; The pressure transmission valve plate 11 in the pressure connection area 2 will float with the pressure liquid input in the pressure connection nozzle 10.

[0023] As Figure 1 , The heat supplement area 14 is arranged between the pressure detection area and the pressure connection area 2. A compensator is also connected to the heat supplement area 14. The compensator includes a compensation bottle 36. The compensation bottle 36 is connected to the pressure gauge housing 1 at the position of the heat supplement area 14 through a copper pipe 35. A floating piston 37 is slidably connected in the compensation bottle 36. A pressure valve 40 is arranged at the top of the compensation bottle 36. A compensation chamber 38 is located between the floating piston 37 and the compensation bottle 36. A low-pressure spring 39 is also arranged between the top of the compensation bottle 36 and the floating piston 37; When the pressure transmission valve plate 11 floats, the internal pressure of the heat-conducting liquid in the heat supplement area 14 will increase. Since the compressibility of the liquid is low, the internal pressure of the liquid will be released into the compensation chamber 38 of the compensation bottle 36 through the copper pipe 35. The pressure valve 40 and the low-pressure spring 39 on the compensation bottle 36 directly determine the sensitivity of the pressure gauge.

[0024] As Figure 1 , Pressure detection mechanism. The pressure detection mechanism includes a connecting frame 15 fixed to the top of the pressure gauge housing 1; The pressure detection mechanism also includes a number of strain gauge assemblies. The strain gauge assembly includes two sets of symmetrically arranged elastic support sheets 22 and pressure strain gauges. An arc-shaped protrusion is arranged in the middle of the elastic support sheet 22. The arc-shaped protrusion is arranged in the heat supplement area 14. As Figure 3, the pressure strain gauge includes a strain portion 21 and a compensation portion 20. The strain portion 21 of the pressure strain gauge is clamped and connected between the end portions of the elastic support piece 22. A number of U-shaped elastic bending portions 42 are arranged on the strain resistance circuit 41. One end portion of the elastic support piece 22 is embedded in the pressure transmission valve plate 11, and the other end portion is embedded in the connecting frame 15. The compensation portion 20 of the pressure strain gauge is fixed through the strain gauge clamping groove 18 provided on the connecting frame 15; a number of lead wires are linearly arranged in an array on the top of the connecting frame 15. The lead wires are used to connect with the compensation resistance circuit 44 and the strain resistance circuit 41 of the pressure strain gauge. A number of plug holes 23 are arranged in an array on the top of the pressure gauge housing 1. A wiring seat 24 is arranged in the plug hole 23, and the wiring seat 24 is connected with the lead wire. A top cover plate 25 is connected to the top of the pressure gauge housing 1 through a flange structure. A hub 26 is arranged in the top cover plate 25. A number of wiring heads inserted into the plug holes 23 are arranged in an array on the hub 26. An external interface 27 is arranged on the top of the top cover plate 25. The external interface 27 is connected with each wiring head. The external interface 27 outputs the compensation resistance values and strain resistance values of each pressure strain gauge through the bridge of the control circuit; when the pressure transmission valve plate 11 is pressed and floats, it will further squeeze each elastic support piece 22, so that the tightened pressure strain gauge is gradually released, and during the release process, the pressure strain gauge will rebound and the resistance value will decrease. The detection of the pressure value is realized through the bridge and the compensation resistance circuit 44.

[0025] As Figure 1 , the heat compensation mechanism, the heat compensation mechanism includes a top compensator and a bottom heat compensator. The top compensator includes a first heat compensating body penetrating through the connecting frame 15. The first heat compensating body adjusts the temperature of the compensation portion 20 of the pressure strain gauge through the heat conduction of the connecting frame 15. The bottom heat compensator includes a second heat compensating body 31 penetrating through the pressure gauge housing 1 in the heat compensation area 14. A heat conducting liquid is filled in the heat compensation area 14. The second heat compensating body 31 adjusts the temperature of the heat conducting liquid; a first through hole 43 is arranged in the middle of the pressure detection area of the pressure strain gauge. The strain resistance circuit 41 of the pressure strain gauge is arranged around the outer circle of the first through hole 43. A third through hole is arranged in the middle of the elastic support piece 22; wherein, the second heat compensating body 31 penetrates through the first through hole 43 and the third through hole; the diameter of the second heat compensating body 31 is less than 80% of the diameters of the first through hole 43 and the third through hole; a second through hole 45 is arranged on the compensation portion 20 of the pressure strain gauge. The compensation resistance circuit 44 of the pressure strain gauge is arranged around the outer circle of the second through hole 45; wherein, the first heat compensating body penetrates through the second through hole 45. A number of heat conducting protrusions 46 integrated with the strain resistance circuit 41 and the compensation resistance circuit 44 are arranged at the positions corresponding to the second through hole 45 at the top ends of the strain resistance circuit 41 and the compensation resistance circuit 44; wherein, the two ends of the strain resistance circuit 41 and the compensation resistance circuit 44 extend towards the top of the pressure strain gauge.

[0026] As Figure 1 and Figure 2 , a number of top clamping grooves 19 are arranged in an array on the connecting frame 15. The strain gauge clamping groove 18 communicates with the top clamping groove 19. A number of bottom clamping grooves 12 are arranged in an array on the pressure transmission valve plate 11. The top of the pressure detection area of the pressure strain gauge is clamped and fixed to the top clamping groove 19 through the top of the elastic support piece 22, and the bottom of the pressure detection area of the pressure strain gauge is clamped and fixed to the bottom clamping groove 12 through the bottom of the elastic support piece 22. A detection groove is arranged at the bottom of the pressure transmission valve plate 11. The top of the detection groove communicates with the bottom clamping groove 12. A sealing piece 13 made of POM is embedded in the detection groove. The detection groove can facilitate the adjustment of the position of the bottom of the pressure strain gauge, and the POM sealing piece 13 can prevent the fluid to be measured from corroding the pressure strain gauge. A number of clamping mechanisms are arranged in a linear array in the connecting frame 15. The clamping mechanism includes two groups of clamping blocks 17. A clamping hole is arranged in the connecting frame 15. The two groups of clamping blocks 17 are symmetrically fixed in the same clamping hole. The top clamping groove 19 and the strain gauge clamping groove 18 are arranged between the two groups of clamping blocks 17.

[0027] As Figure 1, wherein, two groups of second sealing blocks 28 are fixed on the middle side wall of the pressure gauge housing 1 by threads, and the two groups of second sealing blocks 28 are coaxially arranged. A second heat conduction sleeve 32 is arranged outside the second heat supplement body 31, and both ends of the second heat supplement body 31 are fixed to the middle of the first sealing block 33 through the second heat conduction sleeve 32; a second sealing groove is arranged at one axial end of the second sealing block 28, and a second sealing cover 29 is fixed in the second sealing groove by threads. A second plug 30 for connecting with the second heat supplement body 31 is arranged at the end of the second sealing cover 29; two groups of socket connectors 16 are fixed on the axial two ends of the connecting frame 15, and two groups of first sealing blocks 33 are fixed on the top side wall of the pressure gauge housing 1 by threads. The front end of the first sealing block 33 is inserted into the socket connector 16. A first heat conduction sleeve is arranged outside the first heat supplement body, and both ends of the first heat supplement body are fixed to the middle of the first sealing block 33 through the first heat conduction sleeve. A first sealing groove is arranged at one axial end of the first sealing block 33, and a first sealing cover is fixed in the first sealing groove by threads. A first plug 34 for connecting with the first heat supplement body is arranged at the end of the first sealing cover; the first plug 34 and the second plug 30 are connected to a thermostat of a control circuit. According to the standard value calibrated during manufacturing, in cooperation with the temperature measuring resistors arranged in the first heat supplement body and the second heat supplement body 31, through a PID control circuit, the first heat supplement body and the second heat supplement body 31 perform constant temperature heat supplement, so that the heat-conducting liquid is at the set standard temperature. At this time, the heat-conducting liquid should be in a flowing state with lower viscosity. At the same time, according to the heat supplement temperature and the resistance value of the current compensation resistance circuit 44, the resistance error caused by reasons such as line loss is calibrated in real time, further ensuring the accuracy of the pressure calculated by the strain resistance circuit 41; in addition, the heated heat-conducting liquid can heat the pressure transmission valve plate 11 in real time, preventing the pressure transmission valve plate 11 from being stuck or the seal from failing caused by a low-temperature pressure source, and also preventing the resin material of the pressure strain gauge from being damaged due to low temperature.

[0028] Inspired by the above ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A pressure gauge with an internal heat compensation diaphragm, characterized in that it comprises: A pressure gauge housing (1), the pressure gauge housing (1) includes a pressure connection area (2), a heat compensation area (14) and a pressure detection area. The pressure connection area (2) is hermetically connected to a pressure source, and the pressure of the pressure source is transmitted through a pressure transmission mechanism. The pressure detection area is connected to the pressure connection area (2), and a pressure detection mechanism is arranged in the pressure detection area to detect the transmitted pressure; A pressure transmission mechanism, the pressure transmission mechanism includes a pressure transmission valve plate (11) that is slidably and hermetically connected to the bottom of the pressure gauge housing (1); the heat compensation area (14) is arranged between the pressure detection area and the pressure connection area (2), and a compensator is also connected to the heat compensation area (14), and a compensation cavity (38) communicating with the heat compensation area (14) is arranged in the compensator; A pressure detection mechanism, the pressure detection mechanism includes a connection frame (15) fixed to the top of the pressure gauge housing (1); the pressure detection mechanism also includes a number of strain gauge assemblies. The strain gauge assembly includes two groups of symmetrically arranged elastic support sheets (22) and pressure strain gauges. An arc-shaped protrusion is arranged in the middle of the elastic support sheet (22), and the arc-shaped protrusion is arranged in the heat compensation area (14). The pressure strain gauge includes a strain part (21) and a compensation part (20). The strain part (21) of the pressure strain gauge is clamped and connected between the ends of the elastic support sheet (22). One end of the elastic support sheet (22) is embedded in the pressure transmission valve plate (11), and the other end is embedded in the connection frame (15). The compensation part (20) of the pressure strain gauge is fixed through a strain gauge clamping groove (18) arranged on the connection frame (15); A heat compensation mechanism, the heat compensation mechanism includes a top compensator and a bottom heat compensator. The top compensator includes a first heat compensation body penetrating through the connection frame (15). The first heat compensation body adjusts the temperature of the compensation part (20) of the pressure strain gauge through the heat conduction of the connection frame (15). The bottom heat compensator includes a second heat compensation body (31) penetrating through the pressure gauge housing (1) in the heat compensation area (14). A heat-conducting liquid is filled in the heat compensation area (14), and the second heat compensation body (31) adjusts the temperature of the heat-conducting liquid.

2. The pressure gauge with an internal heat compensation diaphragm as claimed in claim 1, characterized in that: A number of top clamping grooves (19) are arranged in an array on the connection frame (15). The strain gauge clamping groove (18) communicates with the top clamping grooves (19). A number of bottom clamping grooves (12) are arranged in an array on the pressure transmission valve plate (11); the top of the pressure detection area of the pressure strain gauge is clamped and fixed to the top clamping groove (19) through the top of the elastic support sheet (22), and the bottom of the pressure detection area of the pressure strain gauge is clamped and fixed to the bottom clamping groove (12) through the bottom of the elastic support sheet (22).

3. The pressure gauge with an internal heat compensation diaphragm according to claim 1, characterized in that: A first through hole (43) is arranged in the middle of the pressure detection area of the pressure strain gauge. The strain resistance circuit (41) of the pressure strain gauge is arranged around the outer circle of the first through hole (43). A third through hole is arranged in the middle of the elastic support sheet (22); wherein, the second heat compensation body (31) penetrates through the first through hole (43) and the third through hole; the diameter of the second heat compensation body (31) is less than 80% of the diameters of the first through hole (43) and the third through hole.

4. The pressure gauge with an internal heat compensation diaphragm according to claim 1, characterized in that: A second via hole (45) is provided on the compensation part (20) of the pressure strain gauge, and the compensation resistance circuit (44) of the pressure strain gauge is arranged around the outer ring of the second via hole (45); wherein, the first heat compensation body penetrates through the second via hole (45).

5. The pressure gauge with an internal heat compensation diaphragm according to claim 5, characterized in that: At the position corresponding to the second via hole (45) at the top ends of the strain resistance circuit (41) and the compensation resistance circuit (44) of the pressure strain gauge, a number of heat-conducting protrusions (46) integrated with the strain resistance circuit (41) and the compensation resistance circuit (44) are provided.

6. The pressure gauge with an internally installed heat compensation diaphragm according to claim 1, characterized in that: A number of clamping mechanisms are arranged in a linear array within the connecting frame (15). The clamping mechanism includes two groups of clamping blocks (17). Clamping holes are provided within the connecting frame (15), and the two groups of clamping blocks (17) are symmetrically fixed within the same group of clamping holes.

7. The pressure gauge with an internal heat compensation diaphragm as claimed in claim 1, characterized in that: Two groups of floating diaphragms (7) with a wavy structure are inlaid and fixed on the side wall of the pressure transmission valve plate (11). The outer ring of the floating diaphragm (7) is embedded into the inner wall of the pressure gauge housing (1); an annular sealing ring (8) is further provided at the edge of the pressure transmission valve plate (11), and the sealing ring (8) is in sliding sealing contact with the inner wall of the pressure gauge housing (1).

8. The pressure gauge with an internal heat compensation diaphragm according to claim 1, characterized in that: Two groups of second sealing blocks (28) are fixed to the middle side wall of the pressure gauge housing (1) by means of threads. The two groups of second sealing blocks (28) are arranged coaxially. A second heat-conducting sleeve (32) is provided outside the second heat compensation body (31). The two end parts of the second heat compensation body (31) are fixed to the middle part of the first sealing block (33) through the second heat-conducting sleeve (32); a second sealing groove is provided at one axial end of the second sealing block (28), and a second sealing cover (29) is fixed in the second sealing groove by means of threads. A second plug (30) for connecting with the second heat compensation body (31) is provided at the end of the second sealing cover (29); two groups of socket connectors (16) are fixed to the two axial end parts of the connecting frame (15), and two groups of first sealing blocks (33) are fixed to the top side wall of the pressure gauge housing (1) by means of threads. The front end parts of the first sealing blocks (33) are inserted into the socket connectors (16). A first heat-conducting sleeve is provided outside the first heat compensation body. The two end parts of the first heat compensation body are fixed to the middle part of the first sealing block (33) through the first heat-conducting sleeve. A first sealing groove is provided at one axial end of the first sealing block (33), and a first sealing cover is fixed in the first sealing groove by means of threads. A first plug (34) for connecting with the first heat compensation body is provided at the end of the first sealing cover.

9. The pressure gauge with an internal heat compensation diaphragm as claimed in claim 1, wherein: The compensator includes a compensation bottle (36). The compensation bottle (36) is connected to the pressure gauge housing (1) at the position of the heat compensation area (14) through a rigid pipeline. A floating piston (37) is slidably connected within the compensation bottle (36). A pressure valve (40) is provided at the top end of the compensation bottle (36). A compensation cavity (38) is located between the floating piston (37) and the compensation bottle (36). A low-pressure spring (39) is further provided between the top end of the compensation bottle (36) and the floating piston (37).

10. A pressure gauge with an internal heat compensation diaphragm as claimed in claim 1, characterized in that: The two end parts of the strain resistance circuit (41) and the compensation resistance circuit (44) extend towards the top of the pressure strain gauge; a number of U-shaped elastic bending parts (42) are arranged on the strain resistance circuit (41).

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