CN206488882U - A kind of pressure-measuring system - Google Patents

Abstract

The utility model discloses a kind of pressure-measuring system, including computer, collector, control unit, temperature sensor, test object, sensor cooling device, nitrogen stop valve and pressure sensor；Wherein, sensor cooling device includes the cooling heat exchange structure with hollow cavity, the hollow cavity of the cooling heat exchange structure is divided into inside and outside two cavitys, and outer chamber is spaced apart two parts of bottom connection, the temperature sensor mounting seat for being provided through a part of outer chamber in the circumference for cooling down heat exchange structure and being connected with inner chamber body, and the nitrogen supply pipe being connected through another part outer chamber and with inner chamber body；The output end of temperature sensor connects the input of collector and the input of control unit respectively, the output end of control unit connects the control end of nitrogen stop valve, the output end of pressure sensor connects the input of collector, and the output end of collector connects the input of computer.

Description

A kind of pressure-measuring system

Technical field：

The utility model is related to a kind of pressure-measuring system, more particularly to a kind of hot environment pressure-measuring system.

Background technology：

Pressure is one of important parameter in industrial processes, in order to ensure production safety reliability service, it is necessary to pressure Power is monitored and controlled.Pressure in industrial production, life and scientific research field generally falls into transient state parameter, that is, the work studied Matter pressure changes with moment time, with behavioral characteristics.Such as pressure in internal combustion engine, gas turbine, steam turbine, rocket engine Power is substantially dynamically, and the gun pressure and explosion wave of firearms are dynamic pressures, various industrial control equipments and engine The pulse of hydraulic pressure, pneumatic means in tool is also dynamic pressure.Therefore the measurement of progress working medium dynamic pressure is needed, to grind Study carefully its hydrodynamic characteristic.

Existing hot environment fluid working substance Dynamic Pressure Measurement System is main by pressure sensor, collector and longer Impulse conduit is constituted, and impulse conduit is primarily used to reduce the temperature of tested working medium.It is limited to the highest of existing pressure sensor Operating temperature is limited, length and the substantially proportional increase of high temperature refrigerant of impulse conduit, i.e., measured Temperature of Working is higher, impulse Catheter length is longer.But the error of dynamic pressure measurement is in inverse ratio with impulse catheter length, and the longer measurement error of impulse conduit is more Greatly.Particularly with high frequency unstable state TRANSFER BY PULSATING FLOW working medium, after longer impulse conduit, the pressure measured by pressure sensor There is larger difference in amplitude-frequency and phase frequency analysis result between signal and fluid working substance true pressure signal.

Utility model content：

In order to reduce the error of unstable state fluid working substance dynamic pressure measurement under existing hot environment, the utility model proposes A kind of pressure-measuring system.The pressure sensor cooling technology of adaptive preset cold conditions nitrogen is employed in the utility model, when When pressure sensor measurement end temperature is higher than sensor maximum operating temperature, the cut-off of control unit output control instruction unpack nitrogen Valve, introduces the cold conditions nitrogen for being slightly above test environment pressure, and turning off nitrogen stop valve after nitrogen is full of test pipeline blocks The cold conditions nitrogen being full of in cold conditions nitrogen stream, test pipeline can effectively prevent thermal shock of the high temperature refrigerant to sensor from making With improving the hot adaptability of pressure sensor；In addition the pressure sensor cooling structure in the utility model employs cold conditions Water high-speed circulating is cooled down and high temperature refrigerant side rib piece enhancing cooling technology, can be shortened the cooling distance that high temperature is tested working medium, be reduced Cooling structure length physical dimension, and then the intrinsic dynamic characteristic of cooling structure is improved, reduce the pressure letter measured by sensor Amplitude-frequency and phase frequency difference number between fluid working substance true pressure signal.

To reach above-mentioned purpose, the utility model adopts the following technical scheme that to realize：

A kind of pressure-measuring system, including computer, collector, control unit, temperature sensor, test object, sensing Device cooling device, nitrogen stop valve and pressure sensor；Wherein,

Sensor cooling device include with hollow cavity cooling heat exchange structure, the cooling heat exchange structure it is hollow Cavity is divided into inside and outside two cavitys, and outer chamber is spaced apart at the top of two parts of bottom connection, cooling heat exchange structure and set It is equipped with the cooling water inlet pipe being connected with a part of outer chamber, and the coolant outlet being connected with another part outer chamber Sensor installation seat is provided with the top of pipe, inner chamber body, bottom is provided with impulse conduit, is set in the circumference for cooling down heat exchange structure The temperature sensor mounting seat for being equipped with through a part of outer chamber and being connected with inner chamber body, and through another part outer chamber And the nitrogen supply pipe being connected with inner chamber body；

Temperature sensor is arranged in temperature sensor mounting seat, and pressure sensor is arranged in sensor installation seat, is surveyed The inner chamber body that working medium is passed through sensor cooling device by impulse conduit, the signal output part of temperature sensor are tested in examination object The input of collector and the input of control unit are connected respectively, and the output end of control unit connects the control of nitrogen stop valve End, the output end of pressure sensor connects the input of collector, and the output end of collector connects the input of computer, nitrogen Stop valve is arranged in nitrogen supply pipe.

The utility model, which is further improved, to be, the installation site of nitrogen supply pipe is higher than temperature sensor mounting seat Installation site.

The utility model, which is further improved, to be, cooling device installation is additionally provided with the circumference for cooling down heat exchange structure Seat.

The utility model, which is further improved, to be, cooling device mounting seat installs two kinds of forms using flange and screw thread.

The utility model, which is further improved, to be, impulse conduit uses stagnation pressure impulse conduit and static pressure impulse conduit two Kind, it is respectively used for measuring the stagnation pressure and static pressure of tested working medium.

The utility model, which is further improved, to be, sensor installation seat is connected through a screw thread the top for being arranged on inner chamber body Portion, impulse conduit is connected through a screw thread the bottom for being arranged on inner chamber body.

The utility model, which is further improved, to be, the cooling cavity outer wall of cooling heat exchange structure including concentric arrangement and Cavity wall is cooled down, the cooling chamber cover plate at the top of cooling cavity outer wall and at the top of cooling cavity wall is arranged on, and be arranged on cooling chamber Outer wall bottom and the cooling chamber bottom plate of cooling cavity wall bottom, wherein, cooling cavity wall and cooling chamber cover plate and cooling chamber bottom plate Between form inner chamber body, form outer chamber between cooling cavity outer wall and cooling cavity wall and cooling chamber cover plate and cooling chamber bottom plate, The outer chamber is two parts by cooling chamber baffle interval, and a part is left semicircle shape cooling flowing path, and another part is right semi-circle Shape cooling flowing path, the left cooling that left and right semicircle cooling flowing path is connected by being formed between cooling chamber dividing plate and cooling chamber bottom plate Stream hole and right cooling flowing path hole.

The utility model, which is further improved, to be, the cooling first-class even angle of cavity wall rounded internal surface is disposed with some Strip heat exchange fin.

The utility model, which is further improved, to be, inner chamber body is circular cylindrical cavity, and outer chamber is annular cavity.

Compared with prior art, the utility model has the advantages that：

The utility model proposes a kind of pressure-measuring system, using the method for pre-fill cold conditions nitrogen, can prevent pressure from passing Sensor measurement end face improves the acclimation to heat ability of sensor directly by the high wind-warm syndrome of tested high temperature refrigerant；Tested Working medium stream side is designed with strip heat exchange fin, tested working medium stream outside and is designed with cooling-water duct, can improve tested height Warm working medium cooling effectiveness, accelerates scattering and disappearing for tested working medium heat, shortens the length of tested working medium impulse stream, improve cooling The intrinsic dynamic characteristic of device, reduces the width between the pressure signal measured by sensor and tested working medium true pressure signal Frequency and phase frequency difference；It is tested in cooling device on working medium stream and devises fluid working substance temperature point, and it is real to combine control unit Cooling nitrogen is showed to automatically feed and close, has further increased the thermal protection effect of pressure sensor, can reach hot environment The long-time measurement effect of lower pressure.

Further, the installation site of nitrogen supply pipe is higher than temperature sensor mounting seat, and this is mainly due to tested working medium Upper end is flowed to from cooling device lower end, when temperature sensor, which experiences tested Temperature of Working, to transfinite, nitrogen cut-off is opened at once Valve, cooling nitrogen is filled with sensor measurement end, can effectively prevent high temperature from being tested working medium feeler measuring cell.In addition it is set The fluid working substance temperature point of meter can monitor the real time temperature of pressure sensor measurement end fluid working substance, facilitate user to grasp pressure The real-time working environment of sensor, and can for pressure sensor damage fail the reason for analysis effective test data is provided.

Further, nitrogen supply pipe and nitrogen stop valve, previously-introduced before experimental test can be slightly above test environment pressure The cold conditions nitrogen of power, the cold conditions nitrogen being pre-filled with cold conditions nitrogen stream, test pipeline is blocked during beginning to be tested to be had Effect prevents high temperature refrigerant to the direct high wind-warm syndrome of sensor, improves the hot adaptability of pressure sensor.

Further, the thread connecting mode of pressure guiding pipe facilitates removing and installing for pressure guiding pipe, and cooling device stagnation pressure can be achieved Or static pressure measurement function.

Further, cooling cavity wall is cooled down by the semicircle cooling flowing path in left and right, accelerates high temperature and be tested working medium The heat for passing to cooling cavity wall scatters and disappears；High temperature is strengthened by strip heat exchange fin and is tested working medium and cooling cavity wall Heat exchange efficiency.The above-mentioned cooling effectiveness for improving tested high temperature refrigerant, accelerates scattering and disappearing for tested working medium heat, shortens tested The length of working medium impulse stream, improves the intrinsic dynamic characteristic of cooling device, reduces the pressure signal measured by sensor Amplitude-frequency and phase frequency difference between tested working medium true pressure signal, reduce unstable state fluid working substance dynamic under hot environment Pressure measurement errors.

Brief description of the drawings：

Fig. 1 is the total integrated figure of the utility model；

Fig. 2 is isometric of the utility model screw thread mounting means pressure sensor cooling device with stagnation pressure impulse conduit Figure；

Fig. 3 a are the top views of the pressure sensor cooling device shown in Fig. 2, and Fig. 3 b are Fig. 3 a A-A to sectional view；

Fig. 4 a are the front views of the pressure sensor cooling device shown in Fig. 2, and Fig. 4 b are Fig. 4 a A-A to sectional view, figure 4c is Fig. 4 a B-B direction sectional view；

Fig. 5 is isometric of the utility model flange mounting means pressure sensor cooling device with stagnation pressure impulse conduit Figure；

Fig. 6 is front view of the utility model pressure sensor cooling device with static pressure impulse conduit；

Wherein：1st, computer；2nd, collector；3rd, control unit；4th, temperature sensor；5th, test object；6th, sensor is cold But device；7th, nitrogen stop valve；8th, pressure sensor 8；9th, cooling water inlet is managed；10th, sensor installation seat；11st, cooling water goes out Mouth pipe；12nd, temperature sensor mounting seat；13rd, cooling device mounting seat；14th, heat exchange structure is cooled down；15th, impulse conduit；16、 Nitrogen supply pipe；17th, cooling chamber dividing plate；18th, exchange heat fin；19th, cavity outer wall is cooled down；20th, cavity wall is cooled down；21st, cooling chamber bottom Plate；22nd, cooling chamber cover plate；23rd, left semicircle shape cooling flowing path；24th, right semicircular cooling flowing path；25th, left cooling flowing path hole；26、 Right cooling flowing path hole；27th, it is tested working medium stream.

Embodiment：

The utility model specific embodiment is described in detail below in conjunction with the accompanying drawings.

Refer to shown in Fig. 1, the utility model discloses a kind of pressure-measuring system, including computer 1, collector 2, control Unit 3 processed, temperature sensor 4, test object 5, sensor cooling device 6, nitrogen stop valve 7 and pressure sensor 8.

Refer to shown in Fig. 2, sensor cooling device 6 includes the cooling heat exchange structure 14 with hollow cavity, and this is cold But the hollow cavity of heat exchange structure 14 is divided into inside and outside two cavitys, and outer chamber is spaced apart two parts of bottom connection, cold But the top of heat exchange structure 14 is provided with the cooling water inlet pipe 9 being connected with a part of outer chamber, and and another part Sensor installation seat 10 is provided with the top of the cooling water outlet pipe 11 that outer chamber is connected, inner chamber body, bottom is provided with impulse The temperature for being provided through a part of outer chamber in conduit 15, the circumference for cooling down heat exchange structure 14 and being connected with inner chamber body is passed Sensor mounting seat 12, and the nitrogen supply pipe 16 being connected through another part outer chamber and with inner chamber body；Temperature sensor 4 It is arranged in temperature sensor mounting seat 12, pressure sensor 8 is arranged in sensor installation seat 10, is tested in test object 5 Working medium is passed through the inner chamber body of sensor cooling device 6 by impulse conduit 15, and the signal output part of temperature sensor 4 is connected respectively The input of collector 2 and the input of control unit 3, the control end of the output end connection nitrogen stop valve 7 of control unit 3, The output end of pressure sensor 8 connects the input of collector 2, and the output end of collector 2 connects the input of computer 1, nitrogen Gas stop valve 7 is arranged in nitrogen supply pipe 16.

The collector 2 can be simultaneously also pressure and temperature in addition to the measurement signal that can gather the sensors such as pressure and temperature The sensors such as degree provide stable dc power supply.Temperature signal of the described control unit 3 according to measured by temperature sensor 4, analysis And judge whether measured Temperature of Working exceedes the maximum operating temperature limitation of pressure sensor 8, export control according to judged result Instruction effect nitrogen stop valve 7 processed, and control instruction maintains certain time by internal timer, realizes that cooling nitrogen is full of and surveys Test tube road.

Refer to shown in Fig. 3 a to Fig. 4 c, the cooling cavity outer wall 19 of cooling heat exchange structure 14 including concentric arrangement and cold But cavity wall 20, are arranged on the cooling chamber cover plate 22 at the top of cooling cavity outer wall 19 and the top of cooling cavity wall 20, and are arranged on The cooling chamber bottom plate 21 of the bottom of cavity outer wall 19 and cooling cavity wall 20 bottom is cooled down, wherein, cooling cavity wall 20 and cooling chamber lid Form inner chamber body between plate 22 and cooling chamber bottom plate 21, cooling cavity outer wall 19 and cool down cavity wall 20 and cooling chamber cover plate 22 and cold But outer chamber is formed between bottom of chamber plate 21, the outer chamber is by cooling chamber dividing plate 17 at intervals of two parts, and a part is left semicircle Shape cooling flowing path 23, another part is right semicircular cooling flowing path 24, and left and right semicircle cooling flowing path passes through cooling chamber dividing plate 17 The left cooling flowing path hole 25 and right cooling flowing path hole 26 being connected are formed between cooling chamber bottom plate 21.

Embodiment

The long 80mm of heat exchange structure 14 is cooled down in the present embodiment, cooling cavity outer wall 19 is in concentric cloth with cooling cavity wall 20 Put, cool down cavity outer wall 19 external diameter 25mm, internal diameter 21mm, wall thickness 2mm, cool down cavity wall 20 external diameter 9mm, internal diameter 5mm, wall thickness 2mm, The standard female of long 15mm M6 × 0.5, cooling are designed with cooling inner surface of the cavity wall 20 away from the end of cooling chamber bottom plate 21 Bottom of chamber plate 21 and the wall thickness 2mm of cooling chamber cover plate 22；Cooling chamber dividing plate 17 long 70mm, thick 2mm, with cooling cavity outer wall 19 and cooling chamber Inwall 20 is connected, and will cool down cavity outer wall 19 and cool down the annular space formed between cavity wall 20 and be divided into left semicircle shape and cool down and flow Road 23 and right semicircular cooling flowing path 24；8 heat exchange fins 18 are angularly evenly arranged in the inner surface of cooling cavity wall 20, change The hot thickness of fin 18 0.5mm, wide 1mm, long 65mm；Cooling water inlet pipe 9 external diameter 5mm, internal diameter 3mm, the external diameter of cooling water outlet pipe 11 5mm, internal diameter 3mm, the two arrangement that is centrosymmetric, and by cooling chamber cover plate 22 respectively with left semicircle shape cooling flowing path 23 and the right side Semicircle cooling flowing path 24 is connected；The external diameter 9mm of sensor installation seat 10, high 12mm, Center is the through hole mark of M5 × 0.5 Quasi- internal thread, it is in concentric arrangement with cooling cavity wall 20, is connected by cooling chamber cover plate 22 with tested working medium stream 27； The external diameter 5mm of nitrogen supply pipe 16, internal diameter 3mm, its axle center is 13mm, nitrogen supply pipe 16 from the distance between cooling chamber cover plate 22 Sequentially pass through cooling cavity outer wall 19 and cooling cavity wall 20 is connected with tested working medium stream 27, set simultaneously in nitrogen supply pipe 16 In respect of nitrogen stop valve 7, to control the supply of cold conditions nitrogen；Temperature sensor mounting seat 12 external diameter 10mm, internal diameter 6mm, are installed Section is designed with the standard female of long 15mm M6 × 1.0, and its axle center is 20mm, temperature from the distance between cooling chamber cover plate 22 Sensor installation seat 12 sequentially passes through cooling cavity outer wall 19 and cooling cavity wall 20 is connected with tested working medium stream 27；Impulse is led Pipe 15 external diameter 6mm, internal diameter 3mm, the upper end of impulse conduit 15 are designed with the standard external of long 15mm M6 × 0.5, and passing through screw thread will Impulse conduit 15 is connected with cooling heat exchange structure 14；Cooling device mounting seat 13 is designed with the mark of long 15mm M30 × 1.5 Quasi- external screw thread, the upper surface of the hex nut of cooling device mounting seat 13 is 35mm from the distance between cooling chamber cover plate 22.

The specific works mode of the present embodiment hot environment pressure-measuring system is as follows：

Cooling water enters left semicircle shape cooling flowing path through cooling water inlet pipe 9 when hot environment pressure-measuring system works 23, the then left cooling flowing path hole 25 and right cooling flowing path hole 26 by being formed between cooling chamber dividing plate 17 and cooling chamber bottom plate 21 Into right semicircular cooling flowing path 24, most flowed out afterwards through cooling water outlet pipe.High temperature is tested working medium directly with cooling down cavity wall 20 And heat exchange fin 18 is in contact, the heat that high temperature is tested working medium is mainly ultimately transferred to cool down cavity wall by heat convection form 20, heat exchange fin 18 improves the transmission efficiency of tested working medium heat because adding heat exchange area；Pass to cooling cavity wall 20 heat is mainly scattered and disappeared by cooling water with cooling cavity wall 20 outside wall surface heat convection, and remaining a part of heat then passes through Cooling chamber dividing plate 17 passes to cooling cavity outer wall 19 by heat-conducting mode, then by cooling cavity outer wall 19 and outer wall cooling air and Inwall cooling water heat convection scatters and disappears.

Before pressure sensor is formally measured, nitrogen stop valve 7 is opened, and pressure is slightly above the cold conditions nitrogen warp of tested working medium Nitrogen supply pipe 16 flows into tested working medium stream 27, is discharged after being full of through impulse conduit 15, when pressure sensor is formally measured Nitrogen stop valve 7 is closed.Cold conditions nitrogen is pre-charged with tested working medium stream 27, pressure sensor is tested working medium with high temperature It is spaced, it is to avoid pressure sensor is directly tested working medium with high temperature and is in contact, and has preferable protective effect to sensor.Pressure When force snesor starts measurement, the cold conditions nitrogen full of stagnation in tested working medium stream becomes a kind of good pressure fluctuation transmission Medium, and under the efficient cooling of cooling water, long-time is maintained into low-temperature condition, is conducive under pressure sensor hot environment Long-term measurement, improve the hot adaptability of pressure sensor.

When pressure sensor is formally measured, computer 1 controls collector 2 to gather pressure sensing by acquisition software system Pressure and temperature signal that device 8 and temperature sensor 4 are experienced, and be stored in the storage device of computer 1, for later stage working medium Analysis of flow characteristics；The temperature signal measured by temperature sensor 4 is admitted to control unit 3 simultaneously, and control unit 3 is by comparing Analysis, judges whether the measurement end Temperature of Working of pressure sensor 4 exceedes the maximum operating temperature limit value of sensor, if defeated more than if Go out control instruction and open nitrogen stop valve 7, and continue for some time, until cold conditions nitrogen is full of tested working medium stream 27, then Nitrogen stop valve 7 is closed, if output control is not instructed not less than if, nitrogen stop valve 7 is remained off, so circulation, is begun Pressure sensor measurement end operating temperature is kept to be less than sensor highest limit value eventually.

Claims (9)

1. a kind of pressure-measuring system, it is characterised in that passed including computer (1), collector (2), control unit (3), temperature Sensor (4), test object (5), sensor cooling device (6), nitrogen stop valve (7) and pressure sensor (8)；Wherein,

Sensor cooling device (6) includes the cooling heat exchange structure (14) with hollow cavity, the cooling heat exchange structure (14) hollow cavity is divided into inside and outside two cavitys, and outer chamber is spaced apart two parts of bottom connection, cools down heat exchange knot Be provided with the top of structure (14) be connected with a part of outer chamber cooling water inlet pipe (9), and with another part outer chamber Sensor installation seat (10) is provided with the top of the cooling water outlet pipe (11) being connected, inner chamber body, bottom is provided with impulse and led Manage (15), a part of outer chamber and the temperature being connected with inner chamber body are provided through in the circumference of cooling heat exchange structure (14) Sensor installation seat (12), and the nitrogen supply pipe (16) being connected through another part outer chamber and with inner chamber body；

Temperature sensor (4) is arranged in temperature sensor mounting seat (12), and pressure sensor (8) is arranged on sensor installation seat (10) inner chamber body that working medium is passed through sensor cooling device (6) by impulse conduit (15), temperature are tested in, in test object (5) The signal output part of degree sensor (4) connects the input of collector (2) and the input of control unit (3) respectively, and control is single The control end of the output end connection nitrogen stop valve (7) of first (3), the output end of pressure sensor (8) connects the defeated of collector (2) Enter end, the input of the output end connection computer (1) of collector (2), nitrogen stop valve (7) is arranged on nitrogen supply pipe (16) On.

2. a kind of pressure-measuring system according to claim 1, it is characterised in that the installation site of nitrogen supply pipe (16) Higher than the installation site of temperature sensor mounting seat (12).

3. a kind of pressure-measuring system according to claim 1, it is characterised in that the circumference of cooling heat exchange structure (14) On be additionally provided with cooling device mounting seat (13).

4. a kind of pressure-measuring system according to claim 3, it is characterised in that cooling device mounting seat (13) uses method Blue and screw thread installs two kinds of forms.

5. a kind of pressure-measuring system according to claim 1, it is characterised in that impulse conduit (15) uses stagnation pressure impulse Two kinds of conduit and static pressure impulse conduit, are respectively used for measuring the stagnation pressure and static pressure of tested working medium.

6. a kind of pressure-measuring system according to claim 1, it is characterised in that sensor installation seat (10) passes through screw thread Connection is arranged on the top of inner chamber body, and impulse conduit (15) is connected through a screw thread the bottom for being arranged on inner chamber body.

7. a kind of pressure-measuring system according to claim 1, it is characterised in that cooling heat exchange structure (14) includes same The cooling cavity outer wall (19) and cooling cavity wall (20) of axle center arrangement, are arranged at the top of cooling cavity outer wall (19) and cooling cavity wall (20) the cooling chamber cover plate (22) at the top of, and be arranged on cooling cavity outer wall (19) bottom and cool down the cold of cavity wall (20) bottom But bottom of chamber plate (21), wherein, form inner chamber between cooling cavity wall (20) and cooling chamber cover plate (22) and cooling chamber bottom plate (21) Body, exocoel is formed between cooling cavity outer wall (19) and cooling cavity wall (20) and cooling chamber cover plate (22) and cooling chamber bottom plate (21) Body, the outer chamber is by cooling chamber dividing plate (17) at intervals of two parts, and a part is left semicircle shape cooling flowing path (23), another portion It is divided into right semicircular cooling flowing path (24), left and right semicircle cooling flowing path passes through cooling chamber dividing plate (17) and cooling chamber bottom plate (21) Between form the left cooling flowing path hole (25) being connected and right cooling flowing path hole (26).

8. a kind of pressure-measuring system according to claim 7, it is characterised in that cooling cavity wall (20) rounded internal surface First-class even angle is disposed with some strip heat exchange fins (18).

9. a kind of pressure-measuring system according to claim 7, it is characterised in that inner chamber body is circular cylindrical cavity, exocoel Body is annular cavity.