CN114923628A - Water pressure gauge calibrating device - Google Patents

Abstract

The invention belongs to the technical field of water transport engineering measurement, and discloses a water pressure gauge calibration device which comprises a pressure tank body, a cover plate and a sealing gasket member, wherein the end part of the pressure tank body radially extends outwards to form a connecting edge, the cover plate is movably connected with the connecting edge, the top surface of the connecting edge and the bottom surface of the cover plate are respectively provided with a sealing groove, the two sealing grooves are correspondingly arranged, when viewed from the axis direction of the pressure tank body, the sealing groove is closed, the width of the bottom of the sealing groove is smaller than that of a notch, the sealing gasket member is arranged between the two sealing grooves to form an annular sealing strip, and the sealing gasket member radially expands along with the increase of pressure to enable the sealing gasket member to be tightly attached to the sealing grooves, so that self-tightening sealing is realized, the sealing performance is improved, the calibration result is more accurate and reliable, and the quantity value tracing range is expanded.

Description

Water pressure gauge calibrating device

Technical Field

The invention belongs to the technical field of water transport engineering measurement, and particularly relates to a water pressure gauge calibrating device.

Background

The pore water pressure gauge is a sensor installed inside civil engineering to measure the pressure of pore water or the pressure of permeated water. The soil pressure gauge is a sensor for monitoring the pressure of soil body in structures such as side slopes, road beds, earth and rockfill dams, earth dikes and the like for a long time. The accuracy of the measured data of the two types of sensors is related to the safety of the structure, and the measured data must be calibrated according to the corresponding measurement technical specifications through a measurement technical mechanism before being used so as to be put into use. The calibration of a water pressure gauge and a soil pressure gauge (hereinafter referred to as a water pressure gauge) is generally carried out by placing the water pressure gauge and the soil pressure gauge in a pressure tank, and then pressurizing step by step to obtain the corresponding relation between a standard pressure value and an output signal value of the water pressure gauge, thereby realizing the calibration of the water pressure gauge.

The prior art provides a metrological verification device for a pore water pressure meter, which is pressurized step by adding air, and the method is easy to cause the excitation effect of the water surface in a pressure tank, so that the water pressure output signal value has large fluctuation and long stabilization time, and the accuracy of a calibration result is poor.

Also through adopting the mode of water pressurization and flowing into to the pressure chamber bottom, this kind of method avoids the surface of water to produce the excitation phenomenon, improve the accuracy of calibration result, but all adopt flat packing rubber seal between the device and the pressure tank body of above-mentioned device and apron, this kind of structure is calibrating the water pressure timing of the slightly high range, need great pretightning force, and the seepage easily takes place when pressure is higher, pressure drop is obvious, pressure stability is poor, consequently, current water pressure gauge calibrating device's sealed effect is not good enough, seriously influence the accuracy of calibration result, also lead to the quantity value range of tracing to the source lower.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a water pressure gauge calibration device which can realize self-tightening sealing, improve the sealing property, further improve the accuracy of a calibration result and enlarge the quantity value tracing range.

In order to solve the problems, the invention provides a water pressure gauge calibration device which comprises a pressure tank body, a cover plate and a sealing pad piece, wherein a pressure cavity is arranged in the pressure tank body, an opening communicated with the pressure cavity is formed in the end part of the pressure tank body, a connecting edge is radially and outwardly extended from the end part of the pressure tank body, the cover plate is movably connected with the connecting edge, sealing grooves are respectively formed in the top surface of the connecting edge and the bottom surface of the cover plate, the two sealing grooves are correspondingly arranged, the sealing grooves are closed when viewed from the axis direction of the pressure tank body, the width of the groove bottom of each sealing groove is smaller than that of each notch, and the sealing pad piece is arranged between the two sealing grooves.

In some embodiments, the pressure tank further comprises a locking member, the connecting edge and the cover plate are respectively provided with a locking through groove penetrating through the connecting edge and the cover plate from top to bottom, the locking member is matched with the locking through groove, and the length direction of the locking through groove is parallel to the axis direction of the pressure tank body.

In some embodiments, the locking through groove is communicated with the connecting edge and the outer edge of the cover plate, two ends of the locking piece are respectively a fixed end and a movable end, and the movable end is movably connected with the connecting edge and the cover plate.

In some embodiments, a rotating shaft is fixedly installed on the pressure tank body, the fixed end is connected with a sleeve, the sleeve is sleeved on the rotating shaft, and the sleeve is located below the locking through groove.

In some embodiments, the rotating shaft is fixed on the pressure tank body through a mounting seat, the mounting seat includes two brackets, the two brackets are distributed at intervals, and two ends of the rotating shaft are respectively fixed on the two brackets.

In some embodiments, the top surface of the cover plate is provided at an outer edge thereof with a wedge portion, the wedge portion is inclined from the outer edge toward the center of the cover plate, and the locking through-groove is located at an outer edge of the wedge portion.

In some embodiments, when the locking member is locked in the locking through groove, the axis of the locking member is perpendicular to the upper surface of the wedge portion.

In some embodiments, a plurality of first preformed holes and a plurality of second preformed holes are formed in the cover plate, the first preformed holes and the second preformed holes are through holes penetrating through two plate surfaces of the cover plate, and the aperture of the first preformed holes is larger than that of the second preformed holes.

In some embodiments, the cover plate is provided with an exhaust hole, the exhaust hole is correspondingly provided with a float exhaust valve, and the float exhaust valve can move up and down relative to the cover plate under the action of pressure.

In some embodiments, a cover plate balancer is further included, the cover plate and the connecting edge being movably connected through the balancer.

In some embodiments, a grid plate is removably disposed within the pressure tank.

In some embodiments, the outer periphery of the gasket member is tightly wrapped with a deformable gasket.

The water pressure gauge calibrating device has the beneficial effects that the provided water pressure gauge calibrating device comprises a pressure tank body, a cover plate and a sealing gasket piece, wherein the end part of the pressure tank body radially extends outwards to form a connecting edge, the cover plate is movably connected with the connecting edge, the top surface of the connecting edge and the bottom surface of the cover plate are respectively provided with a sealing groove, the two sealing grooves are correspondingly arranged, the sealing groove is closed when seen from the axis direction of the pressure tank body, the width of the groove bottom of the sealing groove is smaller than that of a notch, the sealing gasket piece is arranged between the two sealing grooves to form an annular sealing strip, and the sealing gasket piece radially expands along with the increase of pressure, so that the sealing gasket piece is tightly attached to the sealing grooves, the self-tightening sealing is realized, the sealing performance is improved, the accuracy of a calibrating result is improved, and the range of a value source is expanded.

Drawings

FIG. 1 is a schematic perspective view of a water pressure gauge calibration apparatus;

FIG. 2 is a schematic diagram of an exploded configuration of the water pressure gauge calibration apparatus shown in FIG. 1;

FIG. 3 is a cross-sectional view of the seal of FIG. 1;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is an enlarged view of a portion of FIG. 3 at B;

fig. 6 is a schematic perspective view of the water pressure gauge calibration device shown in fig. 1.

Description of reference numerals:

10. a pressure tank body; 11. a rotating shaft; 12. a support; 121. mounting holes; 13. positioning a stop block; 14. a water injection port; 15. a water outlet; 16. a grid plate; 20. a cover plate; 21. a wedge portion; 22. a first preformed hole; 23. a second preformed hole; 24. a measurement standard interface; 25. a float vent valve; 26. a special hollow closed bolt; 27. a handle; 30. a gasket member; 40. a connecting edge; 41. a sealing groove; 42. locking the through groove; 50. a deformable pad; 51. a gap; 60. a locking member; 61. a kit; 62. a nut; 70. supporting legs; 71. a support sheet; 72. a base plate; 73. a fixing member; 80. a balancer; 81. an upper frame; 82. a lower frame; 90. a water pressure gauge; 91. a fine joint wire; 92. and (4) thick joint conducting wires.

Detailed Description

In order to facilitate an understanding of the invention, specific embodiments thereof will be described in more detail below with reference to the accompanying drawings.

As used herein, unless otherwise specified or defined, "first" and "second" … are used merely to distinguish between names and do not denote a particular quantity or order.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, unless specified or otherwise defined.

It should be noted that "fixed to" or "connected to" in this document may be directly fixed to or connected to one element or may be indirectly fixed to or connected to one element.

As shown in fig. 1 to 6, an embodiment of the present invention discloses a water pressure gauge calibration apparatus, including a pressure tank 10, a cover plate 20 and a sealing gasket 30, wherein a pressure chamber is disposed in the pressure tank 10, an opening communicated with the pressure chamber is disposed at an end of the pressure tank 10, a connecting edge 40 is radially and outwardly extended from the end of the pressure tank 10, the cover plate 20 is movably connected to the connecting edge 40, sealing grooves 41 are respectively disposed on a top surface of the connecting edge 40 and a bottom surface of the cover plate 20, the two sealing grooves 41 are correspondingly disposed, when viewed from an axial direction of the pressure tank 10, the sealing groove 41 is closed, a width of a groove bottom of the sealing groove 41 is smaller than a width of a notch, the sealing gasket 30 is disposed between the two sealing grooves 41 to form an annular sealing band, and as pressure increases, the sealing gasket 30 radially expands, the sealing gasket 30 is more tightly attached to the sealing groove 41, thereby realizing self-tightening sealing and improving sealing performance, and further, the accuracy of the calibration result is improved, and the magnitude tracing range is expanded.

The pressure tank 10 is preferably a cylindrical tank, and the seal groove 41 is preferably an annular trapezoidal groove. In this embodiment, the gasket member 30 is also configured as an annular gasket, and the deformable gasket 50 is tightly wrapped around the outer surface of the gasket member 30. Specifically, the deformable gasket 50 is also configured to be annular, and a gap 51 is formed at an outer diameter edge of the deformable gasket 50, the deformable gasket 50 is sleeved around the outer periphery of the gasket 30 through the gap 51 and tightly covers the gasket 30, the sealing cross-sectional view of the deformable gasket 50 is shown in fig. 3 to 5, when the cover plate 20 is closed and the cover plate 20 and the pressure tank 10 are locked, the deformable gasket 50 is tightly attached to the upper and lower sealing grooves 41 under the axial compression effect, and the deformable gasket 50 and the gasket 30 form an annular sealing band with better sealing performance, so that the sealing effect is better.

Wherein the gasket member 30 includes, but is not limited to, an octagonal gasket and an oval gasket, in this embodiment the gasket member 30 is preferably configured as an annular octagonal gasket, and the deformable gasket 50 includes, but is not limited to, a flexible rubber gasket. The deformable gasket is detachably and tightly wrapped around the outer surface of the octagonal gasket like a rubber leather sheath and is always placed in an annular sealing groove 41 formed in the connecting edge 40.

The radially outer groove walls of the upper and lower seal grooves 41 and the radially outer wall of the gasket member 30 serve as sealing surfaces of the seal structure, and the radially inner groove walls of the upper and lower seal grooves 41 serve as support conical surfaces of the octagonal gasket. With the increase of the pressure, although the cover plate 20 and the connecting edge 40 are deformed to cause the relative separation between the sealing surfaces and the relative reduction of the sealing ratio of the gasket, the pressure inside the pressure chamber also radially expands the octagonal gasket to compress the flexible rubber gasket to be more tightly attached to the outer side groove wall of the sealing groove 41, so that the self-tightening effect is generated, and the sealing effect is improved.

In particular, a flange may be welded to the end of the pressure tank 10 to form a connecting edge 40 extending outward in the radial direction, and the cover plate 20 may also be a flange of the same size, so that the cover plate 20 and the pressure tank 10 may be more conveniently locked.

The water pressure gauge calibration device further comprises a locking member 60, the locking member 60 is movably connected with the connecting edge 40 and the cover plate 20, the connecting edge 40 and the cover plate 20 are respectively provided with a locking through groove 42 which penetrates up and down, the locking member 60 is matched with the locking through groove 42, the connecting edge 40 and the cover plate 20 can be locked through the locking member 60, and the length direction of the locking through groove 42 is parallel to the axis direction of the pressure tank body 10.

Wherein, in other possible embodiments, the locking member 60 is generally configured as a straight bolt, and the cover plate 20 is directly anchored using threads. That is, the connecting edge 40 (end flange) of the pressure tank 10 is connected with the cover plate 20 through the straight bolt, and the structure is complex and inconvenient to disassemble and can not be rapidly disassembled and assembled; moreover, the cover plate 20 is generally heavy and not easy to open and close, two persons are generally required to cooperate to open the cover plate 20, time and labor are wasted, and the calibration efficiency is low.

Therefore, it is preferable that the locking through-groove 42 is communicated with the connecting edge 40 and the outer edge of the cover 20, and the locking member 60 has a fixed end and a movable end at its two ends, the movable end is movably connected with the connecting edge 40 and the cover 20, and the fixed end is fixed on the pressure tank 10, although in other possible embodiments, the fixed end can be fixed on the connecting edge 40. The movable end can swing up and down by 180 degrees with the fixed end as a fixed point, and when the movable end swings to the highest point, the locking part 60 can enter the locking through groove 42 so as to be matched with the locking through groove 42 to realize the locking between the cover plate 20 and the connecting edge 40.

For example, in the present embodiment, the locking member 60 is provided as a loose joint bolt, the movable end of the locking member 60 is connected with the nut 62, when the cover plate 20 is in the open state, the movable end is located below the fixed end, the nut 62 is located below the connecting edge 40, and when the bolt is located in the locking through groove 42 (the cover plate 20 is in the locked state), the movable end is located above the fixed end, and the nut 62 is located above the cover plate 20.

The cover plate 20 may be tightened by tightening the nut 62 and the loose joint bolt to compress the distance between the nut 62 and the fixed end of the loose joint bolt. The quick-opening structure of the loose joint bolt structure matched with the nut can realize quick opening and closing of the pressure tank body 10 and the cover plate 20, improve the calibration efficiency and realize the quick-opening function.

Alternatively, in some other possible embodiments, the locking member 60 can also achieve the quick-opening function through a clip structure, so as to replace the quick-opening structure of the loose-joint bolt in the embodiment.

It is contemplated that excessive pressure within the pressure chamber may cause the cover plate 20 to tend to arch relative to one another, thereby causing the retaining member 60 to slide out of the retaining channel 42. It is further preferable that the edge of the top surface of the cover plate 20 is provided with a wedge 21, the wedge 21 is inclined from the outer edge to the center of the cover plate 20, the wedges 21 are distributed along the circumferential direction of the cover plate 20, and the locking through-groove 42 is located at the outer edge of the wedge 21. As shown in fig. 5, when the locking member 60 is locked in the locking through groove 42, the locking member 60 is inclined at a certain angle and is located in the locking through groove 42, an included angle is formed between the axis of the locking member 60 and the length direction of the locking through groove 42, the axis of the locking member 60 is perpendicular to the upper surface of the wedge portion 21, at the moment, the nut 62 (generally, a flange nut) on the movable end is parallel to the upper surface of the wedge portion 21 in the radial section, so that the quick-opening function can be realized, the locking member 60 can be prevented from sliding out along the locking through groove 42, and the locking force can be increased.

The locking through grooves 42 and the locking pieces 60 are correspondingly arranged in a plurality, the locking through grooves 42 are distributed in the circumferential direction of the connecting edge 40 (end flange) at intervals, the locking through grooves 42 are respectively communicated with the outer edge of the end flange, and similarly, the locking through grooves 42 are correspondingly distributed in the circumferential direction of the outer edge of the wedge-shaped part 21. Correspondingly, a plurality of locking members 60 are correspondingly arranged on the pressure tank 10, and the plurality of locking members 60 correspond to the plurality of locking through grooves 42 one by one.

In this embodiment, the rotating shaft 11 is fixedly installed on the pressure tank 10, the fixed end of the locking member 60 is connected to the sleeve 61, the sleeve 61 is sleeved on the rotating shaft 11, and the sleeve 61 is located below the locking through groove 42. The rotating shaft 11 is fixed on the pressure tank 10 through a mounting seat, the mounting seat comprises two brackets 12, the two brackets 12 are distributed at intervals, mounting holes 121 are correspondingly formed in the two brackets 12, and two ends of the rotating shaft 11 penetrate through the mounting holes 121 respectively and are fixed on the two brackets 12. Wherein, the interval distribution forms the activity space between two supports 12, and the activity space is located the below of locking logical groove 42, and external member 61 is located the activity space. Preferably, the movable space is connected to the locking through-groove 42 on the connecting edge 40, that is, the two brackets 12 are respectively adjacently distributed below two sidewalls of the locking through-groove 42.

Considering that the water pressure meter (less than or equal to 0.6MPa) in the calibration low range is directly placed at the bottom in the pressure tank body 10 for calibration, but due to the static pressure of water, the initial signal value of the water pressure meter is seriously deviated, and the accuracy of the calibration result of the water pressure meter is seriously influenced.

Therefore, the pressure tank body 10 is internally detachably provided with a grid plate 16, the plate surface of the grid plate 16 is parallel to the cross section of the pressure tank body 10, and the grid plate 16 divides the pressure cavity into an upper pressure space and a lower pressure space which are communicated. The grid plate 16 is used for placing a water pressure gauge, is particularly suitable for the water pressure gauge with low measuring range, can greatly reduce the influence of the static pressure of the water in the pressure tank body 10 on the initial signal value of the water pressure gauge, and ensures the accuracy and reliability of calibration data. The grid plates 16 are fully movable and when the large-sized water pressure gauge needs to be calibrated, the grid plates 16 can be directly taken out of the pressure tank body 10 to meet the calibration requirement of the large-sized water pressure gauge.

In particular, in some other possible embodiments, the outer edge of the grid plate 16 may be provided with a first plug connector, and the inner side wall of the pressure tank 10 may be provided with a second plug connector in a protruding manner, so that the grid plate 16 is inserted into the pressure chamber of the pressure tank 10 by the first plug connector and the second plug connector being engaged. The relative movement direction between the first plug connector and the second plug connector is parallel to the axial center direction of the pressure tank 10.

In this embodiment, the positioning block 13 is protruded from the inner sidewall of the pressure tank 10, so that the grid plate 16 can be directly placed into the pressure chamber and clamped above the positioning block 13. The positioning stop 13 is arranged inside the pressure tank 10 and can support and hold the grating plate 16.

Furthermore, considering the single design and function of the existing pressure tank cover plate 20, the number of the disposable calibration water pressure meters is small, and the calibration requirements of the water pressure meters in the forms of thick joints and special joints cannot be met.

Based on this, in the present invention, preferably, the cover plate 20 is provided with a plurality of first preformed holes 22 and a plurality of second preformed holes 23, the first preformed holes 22 and the second preformed holes 23 are through holes penetrating through two plate surfaces of the cover plate 20, and the aperture of the first preformed holes 22 is larger than the aperture of the second preformed holes 23. For example, in the present embodiment, three large first prepared holes 22 and seven small second prepared holes 23 are provided in the upper portion of the pressure cover plate 20. The water pressure gauge of polylinker form can be calibrated to the preformed hole not of uniform size like this, adapts to the water pressure gauge calibration of thick joint, special joint form, and application scope is wide, and can calibrate a plurality of water pressure gauges with the range simultaneously, improves calibration efficiency greatly, and the function is diversified.

In addition, a metering standard device interface 24 and an exhaust hole are also arranged on the cover plate 20, a float exhaust valve 25 is correspondingly arranged at the exhaust hole, and the float exhaust valve 25 can move up and down relative to the cover plate 20 under the action of pressure. When water is injected and pressurized, air in the pressure tank body 10 can be automatically exhausted from the float exhaust valve 25, so that the air in the pressure tank body 10 can be automatically exhausted without manual adjustment, and the shock excitation effect of the air on the water surface can be avoided. And the gauge interface 24 is adapted to receive a gauge (e.g., a precision digital pressure gauge or pressure transducer) through which the water pressure level within the pressure chamber may be observed and recorded in real time.

When the bolt is used, the inner walls of the first preformed hole 22 and the second preformed hole 23 are provided with threads, the first preformed hole 22 is screwed in a matched mode through a first bolt end socket (such as a special hollow slotted bolt) with matched size, and the second preformed hole 23 is screwed in a matched mode through a second bolt end socket (such as a special hollow closed bolt 26) with matched size. In addition, a hollow slotted stainless steel gasket with a slotted opening and a hollow slotted rubber sealing gasket are also adopted between the bottom of the first preformed hole 22 and the special hollow slotted bolt, and are matched with the special hollow slotted bolt to extrude and seal the lead. Wherein, the groove opening refers to a gap for communicating the central through groove and the outer edge, and the thick connector lead 92 is sleeved in the central through groove of the hollow grooved stainless steel gasket and the hollow grooved rubber sealing gasket through the groove opening; a hollow sealed stainless steel gasket and a hollow sealed rubber gasket which are only provided with a central through groove are also adopted between the bottom of the second preformed hole 23 and the special hollow sealed bolt 26, the hollow sealed stainless steel gasket and the hollow sealed rubber gasket are matched with the special hollow sealed bolt 26 to extrude a sealed lead, and the thin joint lead 91 can directly penetrate through the central through grooves of the hollow sealed stainless steel gasket and the hollow sealed rubber gasket. When the sealing device is not used, the first preformed hole 22 and the second preformed hole 23 can be sealed and stored through the cooperation and extrusion sealing of a solid sealing gasket (such as a solid rubber sealing gasket) and a special solid bolt.

When the water pressure meter is calibrated, the water pressure meter 90 is placed on the grid plate 16, if the lead of the water pressure meter 90 is a fine joint lead 91 which directly adopts a bare fine lead as a joint, the lead penetrates out of a small second reserved hole 23 on the cover plate 20, then a hollow closed stainless steel gasket and a hollow closed rubber sealing gasket with corresponding lead diameters penetrate through the fine joint lead 91, and then a special hollow closed bolt 26 is screwed in threaded fit with the inner wall of the hole to extrude and seal the lead, so that the water is prevented from overflowing along the lead, and the water pressure meter lead sealing in a fine joint form is realized;

if the wire of water pressure gauge 90 is thick joint wire 92 that adopts thick joint, then wear out from the big first preformed hole 22 on the apron 20, overlap outside thick joint wire 92 with crossing the mode cover that overlaps with two hollow fluting rubber seal pads and two hollow fluting stainless steel gaskets, reuse special hollow fluting bolt and downthehole wall screw-thread fit are screwed with extrusion sealing wire, prevent that water from spilling over along the wire, thereby realize that the water pressure gauge wire of thick joint form is sealed, avoided in the current scheme just can carry out the drawback of calibration through destroying the wire.

In this embodiment, a balancer 80 is further included, and the cover plate 20 and the connecting edge 40 are movably connected by the balancer 80. The balancer 80 includes an upper frame 81, a lower frame 82 and a spiral spring mechanism, the upper frame 81 and the lower frame 82 are hinged, the spiral spring mechanism is connected between the upper frame 81 and the lower frame 82, the upper frame 81 is fixedly connected with the cover plate 20, and the lower frame 82 is fixedly connected with the connecting edge 40.

The working principle of the balancer 80 is mainly that the hung external load is in a suspension state in the air by means of energy accumulated by the volute spring in the balancer 80, so that elastic potential energy and gravity are balanced, and an operator can easily stop a hung object at any position by using small force. Suitable for devices that open and close frequently.

The handle 27 is further arranged on one side, far away from the balancer 80, of the cover plate 20, the pressure cover plate 20 can be opened and closed easily in a labor-saving mode through the handle 27 by means of the balancer 80, the balancer 80 can enable the cover plate 20 to be opened and closed between 0 degree and 96 degrees and can hover at any position, the quick-opening function is further achieved, the water pressure gauge is placed and taken out conveniently, the labor intensity of calibration is greatly relieved, and meanwhile the working efficiency is also improved.

In this embodiment, a water injection port 14 is provided below the connecting edge 40 of the pressure tank 10, and water is injected into the pressure tank 10 through the water injection port 14 by a pressurizing means. The pressure cover plate 20 is provided with a measuring standard device, and the pressure of water injection can be displayed in real time from the measuring standard device. Further, a water outlet 15 is formed at the bottom of the pressure tank 10 for discharging the sewage in the pressure tank 10 after the pressure tank 10 is irregularly cleaned. And a plurality of supporting feet 70 are further disposed at the bottom of the pressure tank 10, and the supporting feet 70 are uniformly distributed at intervals along the circumferential edge of the bottom of the pressure tank 10, for example, in this embodiment, three supporting feet 70 are disposed.

Further, the supporting leg 70 includes two supporting pieces 71, a bottom plate 72 and a fixing piece 73, wherein the two supporting pieces 71 are vertically disposed above the bottom plate 72, the fixing piece 73 is folded along two ends of the length direction to form a clamping piece with a certain angle, the angle of the clamping piece matches with the angle formed by the joint of the lower portion of the outer sidewall and the bottom of the pressure tank 10, the clamping piece can be seamlessly attached to the joint of the lower portion and the bottom of the outer sidewall of the pressure tank 10, the clamping piece can be fixed to the joint of the lower portion and the bottom of the outer sidewall of the pressure tank 10 in a welding manner, the top of the supporting piece 71 is also recessed inwards to form an installation groove, the radian of the installation groove matches with the angle formed by the clamping piece, and therefore, the supporting pieces 71 can be attached to the lower portion of the fixing piece 73 through the installation groove, and therefore, the supporting leg can be more stable. Alternatively, the two supporting pieces 71 are spaced apart from each other at the top surface of the bottom plate 72 near the two side edges, and the two supporting pieces 71 are spaced apart from each other at the bottom surface of the fixing member 73 near the two side edges.

The use process of the quick-open type water pressure gauge calibration device with the self-tightening function comprises the following steps of S1-S5:

s1, first, the pressure cover plate 20 is pulled up to a proper angle by the handle 27, the calibrated water pressure gauge 90 is placed on the grid plate 16, and the thin joint lead 91 is passed through the second reserved hole 23 if the water pressure gauge is a thin joint type water pressure gauge, or at most seven thin joint type water pressure gauges can be simultaneously passed through seven second reserved holes 23 if the water pressure gauge is a same-scale water pressure gauge. In the case of the thick tap type water pressure gauge, the thick tap wire 92 is passed through the first prepared hole 22, and at most three thick tap type water pressure gauges may be simultaneously passed through the three first prepared holes 22 for the same amount. If a large scale water pressure gauge is calibrated, the grid plate 16 can be removed and the large scale water pressure gauge can be placed into the bottom of the pressure vessel 10.

S2, pressing the cover plate 20 downwards by using the handle 27, enabling the sealing groove 41 on the bottom surface of the pressure cover plate 20 to be attached to the octagonal pad coated by the flexible rubber gasket, enabling the locking through grooves 42 of the cover plate 20 to correspond to the loose joint bolts below the end flanges one by one, and then screwing the loose joint bolts in pairs to ensure good sealing performance.

S3, sequentially passing the hollow sealed rubber sealing gasket and the hollow sealed stainless steel gasket through the thin joint lead 91 to be placed in the second reserved hole 23, screwing the hollow sealed bolt 26 and the second reserved hole 23 to extrude and seal the thin joint lead 91, reserving a lead with a certain length for connecting a special data acquisition instrument to acquire a water pressure gauge signal, and plugging other unused second reserved holes 23 by using a solid rubber sealing gasket and a special solid bolt. Sleeving two hollow slotted rubber sealing gaskets and two hollow slotted stainless steel gaskets outside the coarse joint lead 92 in a cross overlapping mode, placing the hollow slotted stainless steel gaskets in the first reserved hole 22, sleeving the coarse joint lead 92 into the first reserved hole 22 through a slotted opening by using a special hollow slotted bolt, screwing the special hollow slotted bolt with the first reserved hole 22 to extrude and seal the coarse joint lead 92, reserving a coarse joint with a certain lead length, connecting a special data acquisition instrument to acquire a water pressure gauge signal, and plugging other unused first reserved holes 22 by using a solid rubber sealing gasket and a special solid bolt.

S4, mounting a metering standard device (such as a precise digital pressure gauge or a pressure sensor) on a metering standard device interface 24, then injecting water into the pressure tank body 10 through the water injection port 14 by using a pressurizing device for pressurizing, stopping pressurizing when a standard pressure value reaches a required calibration pressure point, and simultaneously recording a pressure value of the metering standard device and a collected signal value of a water pressure gauge, thus completing calibration of all the pressure points in sequence.

S5, after the calibration is finished, sequentially detaching the thread seal head of the second preformed hole 23 and/or the thread seal head of the first preformed hole 22, detaching the loose joint bolt, lifting the cover plate 20 by using the handle 27 after the detachment is finished, taking out the water pressure gauge, and then calibrating the water pressure gauge in the next measuring range.

The above examples are not intended to be exhaustive list based on the present invention, and there may be many other embodiments other than those listed. Any replacement or improvement made without departing from the concept of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a water pressure gauge calibrating device, its characterized in that, includes the pressure tank body, apron and sealing pad spare, the internal pressure chamber that is equipped with of pressure tank, the tip of the pressure tank body be equipped with the opening that the pressure chamber is linked together, the tip of the pressure tank body radially outwards extends to be provided with connects the edge, the apron with swing joint is followed in the connection, connect the top surface on edge with the bottom surface of apron is provided with the seal groove respectively, and two seal grooves are corresponding to be set up, follow the axial center direction of the pressure tank body is seen, the seal groove is the closed form, the tank bottom width of seal groove is less than the notch width, sealing pad spare is arranged in two between the seal groove.

2. The water pressure gauge calibration device according to claim 1, further comprising a locking member, wherein the connecting edge and the cover plate are respectively provided with a locking through groove which penetrates through the upper part and the lower part, the locking member is matched with the locking through groove, and the length direction of the locking through groove is parallel to the axis direction of the pressure tank body.

3. The water pressure gauge calibration device according to claim 2, wherein the locking through groove is communicated with both the connecting edge and the outer edge of the cover plate, two ends of the locking member are respectively a fixed end and a movable end, and the movable end is movably connected with the connecting edge and the cover plate.

4. The water pressure gauge calibration device according to claim 3, wherein a rotating shaft is fixedly installed on the pressure tank body, the fixed end is connected with a kit, the kit is sleeved on the rotating shaft, and the kit is located below the locking through groove.

5. The water pressure gauge calibration device according to claim 4, wherein the rotating shaft is fixed on the pressure tank body through a mounting seat, the mounting seat comprises two brackets which are distributed at intervals, and two ends of the rotating shaft are respectively fixed on the two brackets.

6. Water pressure gauge calibrating device according to any one of claims 3 to 5, characterized in that a wedge is provided at the outer edge of the top surface of said cover plate, said wedge being inclined from the outer edge towards the center of said cover plate, said locking through-slot being located at the outer edge of said wedge.

7. The water pressure gauge calibration device according to any one of claims 1 to 5, wherein the cover plate is provided with a plurality of first prepared holes and a plurality of second prepared holes, the first prepared holes and the second prepared holes are through holes penetrating through two plate surfaces of the cover plate, and the aperture of the first prepared holes is larger than that of the second prepared holes.

8. The water pressure gauge calibration device according to any one of claims 1 to 5, wherein the cover plate is provided with an exhaust hole, a float exhaust valve is correspondingly arranged at the exhaust hole, and the float exhaust valve can move up and down relative to the cover plate under the action of pressure.

9. Water pressure gauge calibration device according to any one of claims 1 to 5, wherein the outer periphery of said gasket member is tightly wrapped with a deformable gasket.

10. Water pressure gauge calibration device according to any of claims 1 to 5, wherein a grid plate is removably arranged inside the pressure tank.

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