CN114279616A

CN114279616A - Pressure gauge with adjustable measuring range

Info

Publication number: CN114279616A
Application number: CN202111441421.4A
Authority: CN
Inventors: 钟正发
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-04-05

Abstract

The invention discloses a pressure gauge with adjustable measuring range, which comprises a meter shell, wherein a pointer cavity is fixedly arranged on the right side surface of the meter shell, a spring tube cavity with an upward opening is arranged in the meter shell, a dial is fixedly arranged on the inner wall of the spring tube cavity, a pressure indicating assembly for fixing a pressure value is arranged in the dial, and a measuring range adjusting assembly for adjusting the measuring range of pressure detection is arranged in the lower end wall of the spring tube cavity; the invention adjusts the compression amount of the rack spring by rotating the screw rod, thereby changing the deformation resistance of the spring tube, changing the measuring range of the pressure gauge, enabling the invention to measure pressure values with different magnitudes, improving the applicability of the invention, simultaneously, utilizing the one-way rotation of the second one-way bearing and the limiting function of the ratchet wheel, enabling the pointer to keep static after the measurement is finished, further facilitating the recording of data by operating personnel, and when the pressure in the spring tube cavity is overlarge due to the leakage of the spring tube, releasing the pressure outwards through the pressure release cavity, and improving the use safety of the invention.

Description

Pressure gauge with adjustable measuring range

Technical Field

The invention relates to the related technical field of pressure gauges, in particular to a pressure gauge with adjustable measuring range.

Background

The pressure gauge is a meter which takes an elastic element as a sensitive element and measures and indicates the pressure higher than the ambient pressure, is very commonly applied and almost extends to all the fields of industrial processes and scientific researches.

Present manometer is when measuring pressure, its range is generally not adjustable, lead to when measuring the big pressure, the manometer of wide range only can be changed, detection operation not convenient for, the unable fixed demonstration of numerical value after the while detects, when the manometer breaks away from the check point, pointer on it can resume the normal position, thereby it is inconvenient to lead to data record, and present pressure measurement table generally does not have the pressure release mouth, make in the testing process, when the crack appears in its interior spring pipe, under the effect of high atmospheric pressure, the glass that leads to the manometer easily is cracked, there is certain potential safety hazard.

Disclosure of Invention

The invention aims to provide a pressure gauge with adjustable measuring range, which is used for overcoming the defects in the prior art.

The pressure gauge with the adjustable measuring range comprises a meter shell, wherein a pointer cavity is fixedly arranged on the right side surface of the meter shell, a spring tube cavity with an upward opening is arranged in the meter shell, a dial is fixedly arranged on the inner wall of the spring tube cavity, a pressure indicating assembly for fixing a pressure value is arranged in the dial, and a measuring range adjusting assembly for adjusting the pressure detection measuring range is arranged in the lower end wall of the spring tube cavity;

the pressure indicating assembly comprises a gear sleeve arranged in the dial plate, a second one-way bearing is rotationally matched in the gear sleeve, a first one-way bearing is rotationally matched in the second one-way bearing, a limiting gear is arranged on the right side of the second one-way bearing, a ratchet wheel is arranged on the lower side of the limiting gear, a pawl is arranged on the right side of the ratchet wheel, a pointer shaft is fixed on the upper end surface of the gear sleeve, and a pointer is fixed at the tail end of the upper side of the pointer shaft;

the range adjusting assembly comprises a driven gear, a rack meshed with the driven gear is arranged on the rear side of the driven gear, a sliding block is arranged on the left side of the rack, a rack spring is fixed between the sliding block and the rack, a lead screw is matched with the inner thread of the sliding block, and an indicating sliding block is fixed on the lower end face of the sliding block.

Preferably, a pointer resetting cavity is arranged in the dial plate, the first one-way bearing is mounted in the lower end wall of the pointer resetting cavity through a bearing, the upper side part of the first one-way bearing extends upwards into the pointer resetting cavity, the gear sleeve is located in the pointer resetting cavity, the upper side part of the pointer shaft extends upwards to the upper side of the dial plate, the pointer is located on the upper side of the dial plate, the upper end face of the dial plate is engraved with numbers, and the numbers represent pressure values.

Preferably, pointer chamber right side intercommunication that resets is equipped with the limit gear chamber, limit gear chamber lower extreme wall normal running fit has a limit gear axle, limit gear axle upside part upwards extends to in the limit gear chamber, limit gear and the ratchet is all fixed in the limit gear axle periphery, limit gear axle up end with be fixed with the torsional spring between the limit gear chamber upper end wall, limit gear with intermeshing between the gear sleeve, the limit gear accessible the torsion of torsional spring makes the pointer resets.

Preferably, the pawl is in sliding fit with the dial plate, the left side part of the pawl extends leftwards into the limiting gear cavity, the right side part of the pawl extends rightwards out of the watch case, the ratchet wheel is abutted against the pawl, a sliding plate cavity is arranged on the right side of the limiting gear cavity, the pawl penetrates through the sliding plate cavity, a sliding plate is in sliding fit in the sliding plate cavity and fixed on the periphery of the pawl, a sliding plate spring is fixed between the right end face of the sliding plate and the right end wall of the sliding plate cavity, and the pawl can be abutted against the outer side face of the ratchet wheel through the elastic force of the sliding plate spring to limit the ratchet wheel.

Preferably, a rack cavity is arranged on the lower side of the spring tube cavity, the lower side part of the first one-way bearing extends downwards into the rack cavity, a driven gear shaft is rotationally matched in the driven gear, the driven gear shaft is rotationally matched with the lower end of the first one-way bearing, the rack is in sliding fit with the rack cavity, the slider is in sliding fit with the rack cavity, an indicating slider cavity is communicated with the lower side of the rack cavity and is in sliding fit with the indicating slider cavity, the lower end face of the watch case is engraved with numbers on the rear side of the indicating slider cavity, the left side part of the lead screw extends leftwards to the outside of the watch case, and the lead screw is rotated, so that the compression amount of the rack spring is changed, the resistance of the spring tube during deformation is adjusted, and the range adjustment is realized.

Preferably, an air inlet pipe is fixed in the pointer cavity, the left side of the air inlet pipe extends leftwards into the spring pipe cavity, the right side of the air inlet pipe extends rightwards out of the pointer cavity, an arc-shaped spring pipe is fixed on the lower end face of the air inlet pipe, an air inlet cavity with a right opening is formed in the air inlet pipe, the air inlet cavity and the spring pipe are communicated, a connecting rod is hinged to the right end face of the spring pipe, a shifting rod is hinged between the lower end face of the dial plate and the lower end wall of the spring pipe cavity, the right end of the connecting rod is hinged to the upper end of the shifting rod, an arc-shaped rack is fixed at the lower end of the shifting rod, the arc-shaped rack and the driven gear can be meshed, high-pressure gas is introduced into the spring pipe to deform, so that the arc-shaped rack is driven to rotate, the driven gear is rotated, and the pointer is driven to rotate, and pressure measurement is realized.

Preferably, two pressure relief cavities which are symmetrical front and back are arranged in the dial plate, the left ends of the two pressure relief cavities are both provided with openings and communicated with the spring tube cavity, a piston is in sliding fit in the pressure relief cavities, a piston spring is fixed between the piston and the bottom wall of the pressure relief cavities, the outer sides of the pressure relief cavities are communicated with exhaust ports with outward openings, and when the pressure in the spring tube cavity is too high, the pressure can be relieved outwards through the exhaust ports, so that the safety in use of the dial plate is ensured.

The invention has the beneficial effects that: the invention adjusts the distance between the sliding block and the rack by rotating the screw rod, further adjusts the compression amount of the rack spring, thereby increasing the torque of the rotation of the driven gear, increasing the resistance of the deformation of the spring tube, thereby changing the measuring range of the pressure gauge, enabling the invention to measure pressure values with different magnitudes, improving the applicability of the invention, simultaneously, utilizing the one-way rotation of the second one-way bearing and the limiting function of the ratchet wheel to enable the pointer to keep static after the measurement is finished, further realizing that the invention can still display the pressure detection value after the pressure is detected to be taken down from the detection point, facilitating the data recording of the operating personnel, and when the pressure in the spring tube cavity is overlarge due to the leakage of the spring tube, the pressure can be released outwards through the pressure release cavity, thus improving the use safety of the invention.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic view of the overall structure of a pressure gauge with adjustable measuring range according to the present invention;

FIG. 3 is a schematic view of A-A of FIG. 2 in accordance with the present invention;

FIG. 4 is an enlarged, fragmentary illustration of the gear sleeve 22 components of FIG. 2 of the present invention;

FIG. 5 is an enlarged, fragmentary, schematic view of a portion of the slider 42 of FIG. 2 in accordance with the present invention;

FIG. 6 is an enlarged, fragmentary view of the components of the needle chamber 23 of FIG. 3 in accordance with the present invention;

FIG. 7 is a schematic top view of a portion of the face plate 32 of FIG. 2 in accordance with the present invention;

fig. 8 is a bottom schematic view of the components of the indicator slide 30 of fig. 2 of the present invention.

10. A watch case; 11. a spring tube; 12. a driven gear; 13. an arc-shaped rack; 14. a connecting rod; 15. a deflector rod; 16. an air inlet cavity; 17. an air inlet pipe; 18. a piston; 19. a spring lumen; 20. a slider; 21. a pointer; 22. a gear sleeve; 23. a pointer chamber; 24. a rack; 25. a driven gear; 26. a first one-way bearing; 27. a rack spring; 28. a rack cavity; 29. an indication slider cavity; 30. an indication slider; 31. a screw rod; 32. a dial plate; 33. a pointer shaft; 34. a driven gear shaft; 35. a limiting gear cavity; 36. a pawl; 37. a torsion spring; 38. a limit gear shaft; 39. a limit gear; 40. a second one-way bearing; 41. a pointer reset cavity; 42. a slide plate; 43. a skateboard chamber; 44. a slider spring; 45. a pressure relief cavity; 46. an exhaust port; 47. a piston spring; 48. and (4) ratchet wheels.

Detailed Description

For purposes of making the objects and advantages of the present invention more apparent and the following detailed description of the invention, taken in conjunction with the examples, it is to be understood that the following text is intended merely to illustrate one or more specific embodiments of the invention, and is not intended to limit the scope of the invention as specifically claimed, and that, as used herein, the terms up, down, left, and right are not limited to the strict geometric definitions thereof, but include tolerances for reasonable and inconsistent machining or human error, the specific features of such an adjustable-range pressure gauge being described in detail below:

referring to fig. 1-8, a pressure gauge with adjustable measuring range according to an embodiment of the present invention includes a case 10, a pointer cavity 23 is fixedly disposed on a right side of the case 10, a spring tube cavity 19 with an upward opening is disposed in the case 10, a dial 32 is fixedly disposed on an inner wall of the spring tube cavity 19, a pressure indicating assembly for fixing a pressure value is disposed in the dial 32, and a measuring range adjusting assembly for adjusting a measuring range of pressure detection is disposed in a lower end wall of the spring tube cavity 19;

the pressure indicating assembly comprises a gear sleeve 22 arranged in the dial 32, a second one-way bearing 40 is rotationally matched in the gear sleeve 22, a first one-way bearing 26 is rotationally matched in the second one-way bearing 40, a limiting gear 39 is arranged on the right side of the second one-way bearing 40, a ratchet wheel 48 is arranged on the lower side of the limiting gear 39, a pawl 36 is arranged on the right side of the ratchet wheel 48, a pointer shaft 33 is fixed on the upper end face of the gear sleeve 22, and a pointer 21 is fixed at the tail end of the upper side of the pointer shaft 33;

the range adjusting assembly comprises a driven gear 25, a rack 24 meshed with the driven gear 25 is arranged on the rear side of the driven gear 25, a sliding block 20 is arranged on the left side of the rack 24, a rack spring 27 is fixed between the sliding block 20 and the rack 24, a screw rod 31 is matched with the inner thread of the sliding block 20, and an indicating sliding block 30 is fixed on the lower end face of the sliding block 20.

Advantageously, a pointer resetting cavity 41 is arranged in the dial 32, the first one-way bearing 26 is mounted in the lower end wall of the pointer resetting cavity 41 through a bearing, the upper side part of the first one-way bearing 26 extends upwards into the pointer resetting cavity 41, the gear sleeve 22 is positioned in the pointer resetting cavity 41, the upper side part of the pointer shaft 33 extends upwards to the upper side of the dial 32, the pointer 21 is positioned on the upper side of the dial 32, and the upper end surface of the dial 32 is engraved with numbers, wherein the values represent pressure values.

Beneficially, pointer chamber 41 right side intercommunication that resets is equipped with limit gear chamber 35, limit gear chamber 35 end wall internal rotation fit has limit gear axle 38, limit gear axle 38 upside part upwards extends to in the limit gear chamber 35, limit gear 39 and ratchet 48 all is fixed in on the limit gear axle 38 periphery, limit gear axle 38 up end with be fixed with torsional spring 37 between the limit gear chamber 35 upper end wall, torsional spring 37 can twist reverse the power of holding, limit gear 39 with intermeshing between the gear sleeve 22, limit gear 39 accessible the torsion of torsional spring 37 makes pointer 21 resets.

Advantageously, the pawl 36 is in sliding fit with the dial 32, a left side portion of the pawl 36 extends leftwards into the limit gear cavity 35, a right side portion extends rightwards out of the watch case 10, the ratchet wheel 48 and the pawl 36 are in mutual abutment, a slide plate cavity 43 is arranged at the right side of the limit gear cavity 35, the pawl 36 penetrates through the slide plate cavity 43, a slide plate 42 is in sliding fit in the slide plate cavity 43, the slide plate 42 is fixed on the periphery of the pawl 36, a slide plate spring 44 is fixed between a right end surface of the slide plate 42 and a right end wall of the slide plate cavity 43, and the pawl 36 can be in abutment with an outer side surface of the ratchet wheel 48 to limit the position through the elastic force of the slide plate spring 44.

Advantageously, a rack cavity 28 is provided at the lower side of the spring cavity 19, a lower side portion of the first one-way bearing 26 extends downward into the rack cavity 28, a driven gear shaft 34 is rotatably fitted in the driven gear 25, the driven gear shaft 34 is rotatably fitted to the lower end of the first one-way bearing 26, the rack 24 is slidably fitted in the rack cavity 28, the slider 20 is slidably fitted in the rack cavity 28, an indicating slider cavity 29 is provided at the lower side of the rack cavity 28 in communication, an indicating slider 30 is slidably fitted in the indicating slider cavity 29, a pointer is engraved on the lower end surface of the indicating slider 30, a number is engraved on the rear side of the indicating slider cavity 29 at the lower end surface of the watch case 10, a left side portion of the lead screw 31 extends leftward out of the watch case 10, and by rotating the lead screw 31, the compression amount of the rack spring 27 is changed, and then the resistance when the spring tube 11 deforms is adjusted, and further the range adjustment is realized.

Beneficially, an air inlet pipe 17 is fixed in the pointer cavity 23, a left side portion of the air inlet pipe 17 extends leftwards into the spring cavity 19, a right side portion extends rightwards out of the pointer cavity 23, an arc-shaped spring pipe 11 is fixed on a lower end face of the air inlet pipe 17, an air inlet cavity 16 with a right opening is arranged in the air inlet pipe 17, the air inlet cavity 16 is communicated with the spring pipe 11, a connecting rod 14 is hinged on a right end face of the spring pipe 11, a shift lever 15 is hinged between a lower end face of the dial 32 and a lower end wall of the spring cavity 19, a right end of the connecting rod 14 is hinged on an upper end of the shift lever 15, an arc-shaped rack 13 is fixed on a lower end of the shift lever 15, the arc-shaped rack 13 and the driven gear 12 can be meshed, when in an initial state, the driven gear 12 and the arc-shaped rack 13 are in a state of being meshed, high-pressure gas is introduced into the spring pipe 11 to deform, thereby driving the arc rack 13 to rotate, so that the driven gear 12 rotates, and further the pointer 21 rotates to realize pressure measurement.

Beneficially, two pressure relief cavities 45 which are symmetrical back and forth are arranged in the dial 32, the left ends of the two pressure relief cavities 45 are both provided with openings and communicated with the spring cavity 19, a piston 18 is in sliding fit in the pressure relief cavities 45, a piston spring 47 is fixed between the piston 18 and the bottom wall of the pressure relief cavity 45, an exhaust port 46 with an outward opening is communicated with the outer side of the pressure relief cavity 45, and when the pressure in the spring cavity 19 is too high, the pressure can be relieved outwards through the exhaust port 46, so that the use safety of the present invention is ensured.

The invention relates to a pressure gauge with adjustable measuring range, which comprises the following working procedures:

when the invention is in the initial state, the arc-shaped rack 13 and the driven gear 12 are not meshed, the rack spring 27 is in the relaxed state, and the rack 24 and the driven gear 25 are just meshed.

When measuring atmospheric pressure, with intake pipe 17 access check point, the high-pressure gas of check point gets into in the spring pipe 11 through air inlet chamber 16 for spring pipe 11 warp, through connecting rod 14 pulling driving lever 15, make driving lever 15 use the pin joint to rotate as the centre of a circle, thereby drive arc rack 13 and use the pin joint to rotate as the centre of a circle, make arc rack 13 and driven gear 12 mesh, arc rack 13 continues to rotate and then makes driven gear 12 rotate, thereby drives first one-way bearing 26 and rotates.

The first one-way bearing 26 rotates, and the gear sleeve 22 is rotated by the second one-way bearing 40, so that the pointer shaft 33 is rotated, and the pointer 21 is rotated.

In this process, the gear sleeve 22 rotates to rotate the limit gear 39, so that the limit gear shaft 38 rotates to drive the torsion spring 37 to generate torsional force, and simultaneously the limit gear shaft 38 rotates to drive the ratchet 48 to rotate, so that the pawl 36 moves to the right.

After the measurement is finished, the present invention is taken down from the detection point, and because no air pressure is input into the spring tube 11, the spring tube 11 is recovered to the initial state under the action of the self elastic force, so that the first one-way bearing 26 is enabled to rotate reversely, and because of the action of the second one-way bearing 40, the first one-way bearing 26 rotates reversely without driving the gear sleeve 22 to rotate reversely.

At this time, due to the limiting effect of the pawl 36, the ratchet wheel 48 cannot rotate reversely, so that the gear sleeve 22 keeps a static state, that is, the pointer 21 keeps a static state, and the number pointed by the pointer 21 is the current measured value.

If the pointer 21 needs to be reset, the pawl 36 is pulled rightwards, so that the pawl 36 is separated from the contact with the ratchet wheel 48, the limit gear shaft 38 rotates reversely under the torsion action of the torsion spring 37, the limit gear 39 rotates reversely, the gear sleeve 22 is driven to rotate reversely, and the pointer 21 rotates reversely and resets.

At the same time, the gear sleeve 22 reversely rotates to drive the first one-way bearing 26 to reversely rotate through the second one-way bearing 40, so that the driven gear 12 reversely rotates, and the driven gear 12 reversely rotates without driving the arc-shaped rack 13 to reversely rotate because the driven gear 12 is disengaged from the arc-shaped rack 13 at the moment.

During the pressure measurement, the first one-way bearing 26 rotates, and the driven gear 25 is rotated by the driven gear shaft 34, so that the rack 24 moves leftward against the elastic force of the rack spring 27, and the rack spring 27 is compressed.

After the measurement is finished, during the first reverse rotation of the first one-way bearing 26 due to the elastic force of the spring tube 11, the rack 24 moves to the right by the elastic force of the rack spring 27, so that the driven gear 25 is reversely rotated.

During the second reverse rotation of the first one-way bearing 26 driven by the limit gear 39 after the pawl 36 is disengaged from the ratchet 48, the first one-way bearing 26 rotates reversely without driving the driven gear 25 to rotate reversely due to the driven gear shaft 34.

If the current measuring range is insufficient during measurement, the screw rod 31 is rotated, so that the slide block 20 moves rightwards, the indicating slide block 30 moves rightwards to point to the direction of X5, the compression amount of the rack spring 27 is increased, the resistance caused by the rotation of the first one-way bearing 26 is increased, the resistance caused by the deformation of the spring tube 11 is increased, and the expansion of the measuring range is realized.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.

Claims

1. A pressure gauge with adjustable measuring range comprises a gauge shell (10), and is characterized in that: a pointer cavity (23) is fixedly arranged on the right side face of the watch case (10), a spring tube cavity (19) with an upward opening is arranged in the watch case (10), a watch plate (32) is fixed on the inner wall of the spring tube cavity (19), a pressure indicating assembly for fixing a pressure value is arranged in the watch plate (32), and a range adjusting assembly for adjusting a pressure detection range is arranged in the lower end wall of the spring tube cavity (19);

the pressure indicating assembly comprises a gear sleeve (22) arranged in the dial (32), a second one-way bearing (40) is rotationally matched in the gear sleeve (22), a first one-way bearing (26) is rotationally matched in the second one-way bearing (40), a limiting gear (39) is arranged on the right side of the second one-way bearing (40), a ratchet wheel (48) is arranged on the lower side of the limiting gear (39), a pawl (36) is arranged on the right side of the ratchet wheel (48), a pointer shaft (33) is fixed on the upper end face of the gear sleeve (22), and a pointer (21) is fixed at the tail end of the upper side of the pointer shaft (33);

the range adjusting assembly comprises a driven gear (25), a rack (24) meshed with the driven gear (25) is arranged on the rear side of the driven gear (25), a sliding block (20) is arranged on the left side of the rack (24), a rack spring (27) is fixed between the sliding block (20) and the rack (24), a lead screw (31) is matched with an internal thread of the sliding block (20), and an indicating sliding block (30) is fixed on the lower end face of the sliding block (20).

2. The pressure gauge with adjustable measuring range of claim 1, wherein: be equipped with pointer chamber (41) that resets in dial plate (32), first one way bearing (26) pass through the bearing install in pointer chamber (41) lower extreme wall, the part upwards extends to in first one way bearing (26) upside the pointer chamber (41) that resets, gear sleeve (22) are located pointer chamber (41) that resets, pointer axle (33) upside part upwards extends to dial plate (32) upside, pointer (21) are located dial plate (32) upside, dial plate (32) up end is carved with the digit, and its numerical value represents the pressure value.

3. The pressure gauge with adjustable measuring range of claim 2, wherein: pointer chamber (41) right side intercommunication that resets is equipped with limit gear chamber (35), limit gear chamber (35) end wall internal rotation cooperation limit gear axle (38) down, limit gear axle (38) upside part upwards extends to in the limit gear chamber (35), limit gear (39) and ratchet (48) all are fixed in on the periphery of limit gear axle (38), limit gear axle (38) up end with be fixed with torsional spring (37) between limit gear chamber (35) the upper end wall, limit gear (39) with intermeshing between gear sleeve (22).

4. The pressure gauge with adjustable measuring range of claim 3, wherein: pawl (36) with dial plate (32) sliding fit, pawl (36) left side part extends to left in spacing gear chamber (35), and right side part extends to right outside watchcase (10), ratchet (48) with mutual butt between pawl (36), spacing gear chamber (35) right side is equipped with slide chamber (43), pawl (36) run through slide chamber (43), sliding fit has slide (42) in slide chamber (43), slide (42) are fixed in on pawl (36) periphery, slide (42) right-hand member face with be fixed with slide spring (44) between slide chamber (43) the right-hand member wall.

5. The pressure gauge with adjustable measuring range of claim 1, wherein: a rack cavity (28) is arranged on the lower side of the spring tube cavity (19), the lower side part of the first one-way bearing (26) extends downwards into the rack cavity (28), a driven gear shaft (34) is rotationally matched in the driven gear (25), the driven gear shaft (34) is rotationally matched with the lower end of the first one-way bearing (26), the rack (24) is in sliding fit with the rack cavity (28), the slider (20) is in sliding fit with the rack cavity (28), an indicating slider cavity (29) is communicated with the lower side of the rack cavity (28), the indicating slider (30) is in sliding fit with the indicating slider cavity (29), the lower end face of the watch case (10) is carved with numbers positioned at the rear side of the indicating slider cavity (29), and the left side part of the screw rod (31) extends to the outside of the watch case (10) leftwards.

6. The pressure gauge with adjustable measuring range of claim 1, wherein: an air inlet pipe (17) is fixed in the pointer cavity (23), the left side part of the air inlet pipe (17) extends leftwards into the spring pipe cavity (19), the right side part extends rightwards out of the pointer cavity (23), an arc-shaped spring tube (11) is fixed on the lower end surface of the air inlet tube (17), an air inlet cavity (16) with a right opening is arranged in the air inlet tube (17), the air inlet cavity (16) is communicated with the spring tube (11), the right end face of the spring tube (11) is hinged with a connecting rod (14), a deflector rod (15) is hinged between the lower end surface of the dial (32) and the lower end wall of the spring tube cavity (19), the right end of the connecting rod (14) is hinged with the upper end of the deflector rod (15), an arc-shaped rack (13) is fixed at the lower end of the deflector rod (15), the arc-shaped rack (13) and the driven gear (12) can be meshed.

7. The pressure gauge with adjustable measuring range of claim 6, wherein: dial plate (32) are equipped with two symmetrical pressure release chamber (45) around, two in the dial plate (32) the equal opening setting in pressure release chamber (45) left end and with spring tube chamber (19) intercommunication, sliding fit has piston (18) in pressure release chamber (45), piston (18) with be fixed with piston spring (47) between pressure release chamber (45) diapire, pressure release chamber (45) outside intercommunication is equipped with outside gas vent (46) of opening.