CN201133852Y

CN201133852Y - Screw spring pressure gauges

Info

Publication number: CN201133852Y
Application number: CNU2007200154433U
Authority: CN
Inventors: 祁胜
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-23
Filing date: 2007-10-23
Publication date: 2008-10-15
Anticipated expiration: 2017-10-23

Abstract

A coil spring manometer is provided with a manometer shell, which is provided with an adapter tube; a movement in the shell is provided with a central shaft, which is provided with a central gear and a pointer; a segment gear engaged with the central gear is arranged beside the central shaft; a rubber spacer is arranged in the fluid inflow adapter tube and connected with a transmission rod; the upper nozzle of the fluid inflow adapter tube is extended from the upper end of the transmission rod; coil springs are arranged in the fluid inflow adapter tube and between the transmission rod and the fluid inflow adapter tube; and a link rod is arranged between the upper end of the transmission rod and the segment gear. The coil spring manometer uses the coil springs as pressure-sensitive elements; the deformation range of the linear relation between pressure and deformation is wide; the linear relation between pressure and deformation is good, and as a result, the coil spring manometer can be used in the full range; the coil springs can be made of cheap steel, less material is used, fabrication is easy, and therefore the production cost of the coil spring manometer is low; when the coil spring manometer is used, the pressure-sensitive elements are not contacted with fluid media, so use reliability is high.

Description

The volute spring tensimeter

Technical field

The utility model relates to a kind of mechanical compression table, particularly a kind of pressure-sensing device of mechanical compression table.

Background technology

At present, the mechanical compression table used of measuring fluid pressure is bourdon gauges mostly.Bourdon gauges has the round box shape watchcase, the box mouth of round box shape watchcase has dial and protective glass plate, the side of round box shape watchcase has and has externally threaded fluid importing adapter, at the bottom of the shell in the round box shape watchcase core frame is arranged, on the core frame, the central shaft of axis on same straight line that axis and round box shape watchcase are arranged, the central gear of axis on same straight line that axis and central shaft are arranged on the central shaft, central shaft is connected with the pointer vertical with central shaft, the return hairspring is arranged between central shaft and the frame, on the core frame, sector shaft with central axes is arranged, the sector gear that is meshed with central gear is arranged on the sector shaft, one end of sector gear has support arm, fluid imports the circular arc bourdon tube that the inner spout of taking over is connected with the sectional area ovalize, and the other end of bourdon tube links to each other with the support arm of sector gear by pull bar.Bourdon tube is also referred to as Bourdon tube, bourdon tube is the pressure-sensing device of mechanical compression table, when the pressure of measured fluid media (medium) acts in the bourdon tube, the oval cross section of bourdon tube has the distortion that is tending towards round section, because this distortion of bourdon tube, produce certain circumference stress, this circumference stress makes the generation displacement that stretches out of the other end of bourdon tube, the size of its displacement depends on the pressure size of measured fluid media (medium), because the other end of bourdon tube links to each other with the support arm of sector gear by connecting rod, the displacement of the bourdon tube other end can be stirred sector gear and be rotated, and the pointer on the driving central shaft demonstrates the pressure of measured fluid.Above-mentioned bourdon gauges has following deficiency:

1. not fine as the pressure of the bourdon tube of pressure-sensing device and the linear relationship between the distortion, be easy to generate permanent strain, during the bourdon tube stress deformation, pressure is less with the deformation range that is deformed into linear relation, so when using bourdon tube to be stressed measuring fluid pressure, work reliably in the safe range of elastic deformation in order to guarantee flexible member, when selection pressure table range, must consider and leave sufficient leeway, general under the situation more stable by measuring pressure, maximum force value should be no more than 3/4 of full scale, under the bigger situation of tested pressure surge, maximum pressure value should be no more than 2/3 of full scale, in order to guarantee measuring accuracy, tested force value should be not less than 1/3 of full scale, and bourdon gauges can not use in full scale;

2. the bourdon tube in the bourdon gauges is to make with copper material, and the material cost of copper material is higher, and the manufacturing process of bourdon tube is also complicated, so the production cost of bourdon gauges is higher;

3. fluid media (medium) directly contacts with the pressure-sensing device bourdon tube, bourdon tube is subjected to the corrosive attack of measured medium for a long time, make bourdon tube be subjected to corrosion failure easily and cause the fluid media (medium) leakage, bourdon tube is easy to generate fracture by fatigue under the pulsating load effect, make sealed at both ends place produce the fluid media (medium) seepage, so the dependability of bourdon tube pressure is relatively poor.

Summary of the invention

The purpose of this utility model is in order to overcome above-mentioned deficiency, good, the pressure of linear relationship that proposes between a kind of pressure and the distortion is bigger with the deformation range that is deformed into linear relation, can in full scale, use, dependability by force, volute spring tensimeter that production cost is lower.

The utility model is realized with the following method.

The volute spring tensimeter has the round box shape watchcase, the box mouth of round box shape watchcase has dial and protective glass plate, at the bottom of the shell in the round box shape watchcase core frame is arranged, on the core frame, the central shaft of axis on same straight line that axis and round box shape watchcase are arranged, the central gear of axis on same straight line that axis and central shaft are arranged on the central shaft, central shaft is connected with the pointer vertical with central shaft, on the core frame, sector shaft with central axes is arranged, the sector gear that is meshed with central gear is arranged on the sector shaft, one end of sector gear has support arm, the side of round box shape watchcase has and has externally threaded fluid importing adapter, in fluid imports adapter, the rubber isolation pad is arranged, in fluid imports adapter, there is drive link rubber isolation pad top, the lower end of drive link and rubber isolation pad offset and connect, the upper end of drive link is stretched out fluid and is imported the inner spout of taking over, in fluid imports and takes over, drive link and fluid have the volute spring that makes drive link be subjected to downward direction power between importing and taking over, and are connected with connecting rod between the inner of drive link and the support arm of sector gear.

During use, fluid media (medium) imports the outer mouth of pipe of taking over from fluid and enters fluid importing adapter, the pressure of fluid media (medium) acts on the rubber isolation pad, the rubber isolation pad produces elastic deformation because of hydrodynamic pressure, promote the drive link of the company of offseting with it, drive link overcomes helical spring elastic force and moves upward, and its upper end is stirred sector gear by connecting rod and rotated, and the pointer on the driving central shaft demonstrates the pressure of measured fluid.

The utility model uses volute spring as pressure-sensing device, during the volute spring stress deformation, the linear relationship between pressure and the distortion is good, and pressure is bigger with the deformation range that is deformed into linear relation, be difficult for permanent strain takes place, the volute spring tensimeter can use in full scale; Volute spring can be made with lower-cost steel, and materials are few, makes easily, makes the manometric production cost of volute spring lower; The volute spring tensimeter in use, pressure-sensing device does not contact with fluid media (medium), long service life, reliability height.

Below in conjunction with accompanying drawing, the utility model is further described.

Description of drawings

Fig. 1 is that synoptic diagram cuts open in a kind of volute spring tensimeter of proposing according to invention scheme of the present utility model master office of looking after stressed;

Fig. 2 is that synoptic diagram cuts open in the manometric side-looking of volute spring office among Fig. 1;

Fig. 3 is that the master of rubber isolation pad analyses and observe enlarged diagram;

Fig. 4 is that the master of sector gear looks synoptic diagram;

Fig. 5 is that the master of the connecting rod between drive link the inner and the sector gear support arm looks synoptic diagram;

Fig. 6 is the main cross-sectional schematic with externally threaded shutoff.

Embodiment

Among Fig. 1～Fig. 6, the volute spring tensimeter has round box shape watchcase 1, the box mouth of round box shape watchcase has dial 2 and protective glass plate 3, at the bottom of the shell in the round box shape watchcase core frame 4 is arranged, on the core frame, the central shaft 5 of axis on same straight line that axis and round box shape watchcase are arranged, the central gear 6 of axis on same straight line that axis and central shaft are arranged on the central shaft, central shaft is connected with the pointer vertical with central shaft 7, on the core frame, sector shaft 8 with central axes is arranged, the sector gear 9 that is meshed with central gear is arranged on the sector shaft, one end of sector gear has support arm 10, the side of round box shape watchcase has and has externally threaded fluid importing adapter 11, in fluid imports adapter, rubber isolation pad 12 is arranged, the rubber isolation pad has the corrugated tube 13 of bottom sealing, the mouth of pipe of corrugated tube is connected with sealing ring 14, fluid imports to take in the outer mouth of pipe internal thread, be rotary with on the internal thread and have externally threaded shutoff 15, there is fluid entrance hole 16 at the axis place of shutoff, shutoff and fluid import between the inner tubal wall of taking over corrugated tube ferrule annular groove 17, in fluid imports adapter, there is drive link 18 rubber isolation pad top, the lower end of drive link and rubber isolation pad offset and connect, the upper end of drive link is stretched out fluid and is imported the inner spout of taking over, in fluid imports and takes over, drive link and fluid have the volute spring 19 that makes drive link be subjected to downward direction power between importing and taking over, and are connected with connecting rod 20 between the inner of drive link and the support arm of sector gear.

In order to make the volute spring tensimeter when the fluid medium pressure fluctuation is big, have certain surge capability, have the center that the damping gasket 22 of aperture 21 is arranged between the outer wall of the corrugated tube bottom of shutoff and rubber isolation pad, the diameter of aperture is 5%～10% of a shutoff axis place fluid entrance hole diameter.

Claims

1. volute spring tensimeter, the round box shape watchcase is arranged, the box mouth of round box shape watchcase has dial and protective glass plate, at the bottom of the shell in the round box shape watchcase core frame is arranged, on the core frame, the central shaft of axis on same straight line that axis and round box shape watchcase are arranged, the central gear of axis on same straight line that axis and central shaft are arranged on the central shaft, central shaft is connected with the pointer vertical with central shaft, on the core frame, sector shaft with central axes is arranged, the sector gear that is meshed with central gear is arranged on the sector shaft, one end of sector gear has support arm, the side of round box shape watchcase has and has externally threaded fluid importing adapter, it is characterized in that: in fluid imports adapter, the rubber isolation pad is arranged, in fluid imports adapter, there is drive link rubber isolation pad top, the lower end of drive link and rubber isolation pad offset and connect, the upper end of drive link is stretched out fluid and is imported the inner spout of taking over, in fluid imports and takes over, drive link and fluid have the volute spring that makes drive link be subjected to downward direction power between importing and taking over, and are connected with connecting rod between the inner of drive link and the support arm of sector gear.

2. by the described volute spring tensimeter of claim 1, it is characterized in that: described rubber isolation pad has the corrugated tube of bottom sealing, the mouth of pipe of corrugated tube is connected with sealing ring, fluid imports to take in the outer mouth of pipe internal thread, be rotary with on the internal thread and have externally threaded shutoff, there is the fluid entrance hole at the axis place of shutoff, and shutoff and fluid import between the inner tubal wall of taking over corrugated tube ferrule annular groove.

3. by the described volute spring tensimeter of claim 2, it is characterized in that: between the corrugated tube bottom outer wall of described shutoff and rubber isolation pad the foraminate damping gasket in center is arranged, the diameter of aperture is 5%～10% of a shutoff axis place fluid entrance hole diameter.