CN208297034U - A kind of protector of fluid pressure sensor - Google Patents

Abstract

The utility model provides a kind of protector of fluid pressure sensor, cavity is equipped in the protector body, the diaphragm that cavity is divided into first chamber and second chamber is equipped in protector body, diaphragm is made of soft materials, the protector body is externally provided with for connecting detection device pipeline and the first connector for being connected to first chamber, protector body is externally provided with for connecting fluid pipeline and the second connector for being connected to second chamber, the inner wall of the second chamber is the cambered surface that vortex is formed for fluid, the tangent setting of cambered surface of the described connection of the second connector second chamber one end and second chamber inner wall, the utility model principle is simple, preparation is easy, it is easy to use, ideal is isolated with pressure detector for fluid, it can reach large-scale production, it plays and promotes research application of the biological medicine in relation to biological products pressure monitoring.

Description

A kind of protector of fluid pressure sensor

Technical field

The utility model relates to a kind of protectors of sensor for measuring Fluid pressure, and in particular to a kind of isolation of sealing Device, for when preventing measured pressure gas or liquid may pollution to susceptor element or signal processing, corrosion or Damage, protective gas or liquid-pressure pick-up.

Background technique

Pressure sensor (Pressure Transducer), which refers to, can experience pressure signal, and can be according to certain rule Pressure signal is converted into the device or device of the electric signal of available output.Pressure sensor usually by pressure-sensing device and Signal processing unit composition.By different test pressure types, pressure sensor can be divided into gauge pressure transducer, differential pressure pick-up and Absolute pressure sensor；

Pressure sensor is a kind of sensor the most commonly used in industrial practice, is widely used in various industrial automatic control rings Border, be related to water conservancy and hydropower, railway traffic, intelligent building, production automatic control, aerospace, military project, petrochemical industry, oil well, electric power, ship, Numerous industries such as lathe, pipeline, there are also medical pressure sensors；It is used primarily in pressurized cylinder, booster, pneumohydraulic pressure-cylinder, gas-liquid In the equipment such as booster, press machine, compressor, air conditioner refrigerating.Pressure sensor is also very common in life, such as in most of friendship There is pressure sensor in logical tool, as there is its application on automobile and on common motorcycle；

The range of pressure sensor, precision, temperature characterisitic, chemical characteristic all select to consider when pressure sensor, And the operation mode of pressure sensor is also major issue in need of consideration when selecting pressure sensor.Such as sensor is used for gas The measurement of body pressure and situation when the measurement of fluid pressure are just different.Gas is compressible fluid, and increasing can store certain when taking by force Compression energy is released again with kinetic energy when decompression, applies shock wave to sensor elastic membrane.It is required that pressure sensor have it is biggish Overload capacity.Liquid is incompressible fluid, and in pressure sensor installation, liquid can then be made without compressible space again by tightening snail Body pressure rise is more than the pressure-resistant limit of elastic membrane, and elastic membrane is caused to rupture.Since such case repeated, pressure is also required Sensor has biggish overvoltage capabilities.When the working environment of pressure sensor is severe, such as there are big vibration, impact, big electricity Magnetic disturbance proposes more strict requirements to sensor.Not only overvoltage capabilities are strong, but also require mechanical seal reliable, anti-loosening, Sensor installation is correct.Lead, pin and the outer conductor of sensor itself should be all electromagnetically shielded, and shielding is well connect Ground.In addition, being considered as the consistency problem of pressure sensor Yu fluid being measured medium.Such as the elastic membrane structure of sensor should be with Corrosive media is spaced, and uses stainless steel radiation fins sensor at this time, and the interior silicone oil of sensor makees transmission medium.Sensor inspection When surveying inflammable, explosive pressure medium, using low current, spark, Mars are generated when preventing elastic membrane from rupturing, and increase pressure sensing The voltage endurance capability of device housing.

For pressure sensor application in all trades and professions, especially industrial application is very more, but industrial general requirement pressure Force snesor being capable of anticorrosion.Pressure sensor connector and cavity generally use import stainless steel overall processing, become as pressure Send stainless steel material corrosion resistance height, the fade performance of device body good, the medium usually detected need to be mutually compatible with the material.But if Some special medias are encountered when use, the guard method of conventional pressure sensor has:

(1) whether mutually compatible with pressure sensor material understand measured medium.By taking material 316L as an example, 316,317L alloys In 100 hours 5% salt spray tests, all do not corrode.

(2) when choosing product sensor, seek advice from whether medium has an impact to pressure sensor to supplier；By to bullet The selection of body resistant material, to reach the demand that user uses.(3) isolation method can be used: had before pressure transmitter Molybdenum-titanium and tantalum piece transmit pressure with methyl-silicone oil between diaphragm and trajectory pipe, and minimum range can accomplish 0~100kPa, if film Sheet material also not corrosion resistant, then can add one layer of F46 diaphragm, but instrument sensitivity can decrease.Isolation film directly can also be made with F46 Piece, transmitting liquid can be selected fluorocarbon oil, then can play dual resisteance.(4) pressure sensor once finds it not in use Just more emat sensor, corresponding some special media special material or special can must be used at once with media compatibility Structure measure.

Other using when points for attention include: that (1) will avoid pressure sensor with excessively high with corrosivity and temperature Media contact to avoid damage it；The position of connecting pipe installation is preferably in the lesser occasion of temperature fluctuation；Measuring some Jie When matter has very high temperature, it is necessary to condenser is connected, this is because to avoid pressure sensor at work Temperature is more than certain limit；The unblocked of catheter interior is kept；In cold winter in use, if pressure sensing If device is mounted on outdoor, must pay attention to having taken antifreeze measure, this be the liquid in order not to allow in some impulse mouths because The reason of icing leads to its volume expansion, is easy damage sensor in this way；(2) user passes through cable in wiring The connector of waterproof or be then to tighten sealing nut around pipe, can prevent liquid from leaking into pressoreceptor by cable Shell inside.(3) it to be distinguished when measuring fluid pressure and gas pressure clear.When measuring fluid pressure, pressure tappings must It need be opened in the side place of pass tubes, this is the reason for there are dregs to precipitate in order to prevent, installs pressoreceptor at this time Place should prevent the impact of other liquid, avoid pressure sensor and damage because the pressure being subject to is excessive.And it is measuring When gas pressure, this pressure tappings must just be opened in the apical position of pass tubes, this is variant with measurement fluid pressure. (4) pressure more than rated insulation voltage power is not applied.If being applied with the pressure of compression resistance or more, breakage may cause.(5) it avoids It is used in the environment of having flammable and explosive gas.It please not exceed when use using voltage range.If being applied with use Voltage more than voltage range then may cause rupture or burn.It avoids making load short circuits.Otherwise rupture or burning be may cause It ruins.It avoids carrying out polarity of power supply etc. wrong wiring, otherwise may cause rupture or burn.

Pressure sensor is certain in use it is noted that protection, although there is stainless steel protection, it is still easy to Damage, especially improper use easily causes pressure sensor to damage, machine is easy to cause to break down, or causes to measure Accuracy decline even data are wrong, cause to lose.Therefore, certain when in use it is noted that protect it, otherwise its damage meeting Cause the loss in production.But for the pressure monitoring of some special industries, such as medical industry, to prevent bacterium or virus pollution Sensor, the liquid or gas monitored cannot directly be contacted with pressure probe；Or it is (general under lower than -20 DEG C warm environment The operating temperature of pressure sensor is -20-80 DEG C), when monitoring the pressure of the stronger gas of toxic or corrosivity or liquid, Be not suitable for cryogenic gas or liquid directly contacting pressure monitor, it is therefore desirable to which there is some strength in an outside, and inside is The baroceptor protective device of deformable airtight mantle indirectly to measure the pressure of gas or liquid.To medical industry For, it is more likely to disposable baroceptor protective device.

Conventional baroceptor protective device is more rare in the market, and the sensor needed for special industry is even more several Without launch.It is seen in existing patent retrieval, relevant patent has: (1) a kind of steam cleaner Automatic-boosting protection dress It sets (patent No.: ZL201621358405.3), this utility model discloses a kind of steam cleaner Automatic-boosting protective device, in work Plug-like connects relay, and when high pressure muzzle or the blocking of heater any position or closing, steam is in conduit and heater body Space forms energy storage high-pressure space, and in safe range when pressure reaches setting value, pressure protector starting is disconnected after automatically controlled Device processed controls power supply, and band pressure high-temperature steam moment strength is discharged after high pressure muzzle is opened, and generates high-pressure wash steam.(2) Hydraulic oil cooling unit (patent No.: ZL201620924356.9) with oil pressure protection, this utility model are related to a kind of with oil The hydraulic oil cooling unit of protection is pressed, compression shock when energy absorption refrigerating machine starts prevents the damage of cooler.The pressure protection Device is a kind of electric motor type pressure protector.(3) medical soft tissue sacculus dilator (patent No.: ZL03208042.5), this is practical It is novel to be related to a kind of medical soft tissue sacculus dilator comprising: a conduit is circle conduit, one end of conduit made of silica gel For open end, the other end of conduit is that closed end is provided with small side hole near away from closed end end on catheter wall；One inflates/fills Water installations are sealedly connected on the open end of the conduit；One dilating sacculus, is made of silica gel, and integrated with the conduit Forming, sealing is nested near the closed end of the conduit, and the small side hole on catheter wall is contained in its blister cavities.This reality It is fully able to reach 600-1000ml with the capacity of novel expanded balloon expandable, but sheathing material is softer, is easy in pressure medium Middle deformation.(4) oil pressure protector of diesel engine for vehicle (patent No.: ZL02269077.8), which is related to The protective device for the diesel engine that automobile uses.A kind of oil pressure protector of diesel engine for vehicle is provided, by gas Cylinder, exhaust brake butterfly valve, gas solenoid valve and control circuit form, and exhaust brake butterfly valve is mounted at the exhaust pipe of engine, gas Body solenoid valve, cylinder and exhaust brake butterfly valve pass sequentially through compressed air line and are connected, and gas solenoid valve is connected with control circuit It connects.The utility model uses Electronic control, implements automatic stopping protection to automobile.(5) engine oil pressure protector (patent No.: ZL95203336.4), which is an engine oil pressure protector, by diode D1 and C1, C2 and double-contact relay G group At.The engine auto extinguishing when automobile engine oil pressure is abnormal has the function that protect engine；The equal body of these protective devices Purposes in long-pending biological medicine larger or relatively difficult to achieve.

It is supervised to prepare the liquid or gas and pressure suitable for biomedical uses for monitoring needed for completely cutting off Device is surveyed, prevents it from directly contacting, protects sensor, the utility model provides a kind of protector of fluid pressure sensor.

Utility model content

Aiming at the shortcomings of the prior art, it is straight to provide a kind of fluid that can completely cut off pressure sensor and be measured for the utility model Contact, while not influencing the protector for the fluid pressure sensor that pressure sensor uses again.

To achieve the goals above, technical solution adopted in the utility model is: a kind of guarantor of fluid pressure sensor Protect device, including protector body is equipped with cavity in the protector body, is equipped in protector body cavity being divided into the The diaphragm of one chamber and second chamber, diaphragm are made of soft materials, and the protector body is externally provided with for connecting detection Device pipeline and the first connector being connected to first chamber, protector body are externally provided with for connecting fluid pipeline and and second chamber Second connector of connection, the inner wall of the second chamber are the cambered surface that vortex is formed for fluid, the second connector connection the The tangent setting of cambered surface of two chambers and second chamber inner wall, when fluid is entered in second chamber by the second connector, second Chamber forces the pressure in first chamber to be arranged to detector pipeline and is passed through detector by the cooperation generation expansion with diaphragm.

The protector body includes upper casing and lower casing, between the diaphragm setting upper casing and lower casing, and outside diaphragm Cooperate along being sealed with the junction of upper casing and lower casing.

Pass through welding manner sealing assembly between the upper casing, diaphragm and lower casing.

First connector is arranged on upper casing, and second connector is arranged on lower casing, and the lower casing is half Spherical or half elliptic structure.

The plane of second connector and lower casing is arranged in parallel angle.

First connector and the second connector is type conical bench connector.

The upper casing and diaphragm forms first chamber, and first chamber passes through the first connector connecting detection device pipeline and detection Device connection.

The lower casing and diaphragm forms second chamber, and second chamber passes through the second fittings fluid line.

The diaphragm surface area is always consistent.

The detector is pressure sensor.

The utility model has the beneficial effects that the utility model provides a kind of protector of fluid pressure sensor, this product By the way that one end chamber inner wall of protector connecting fluid pipeline is arranged to form the cambered surface of vortex for fluid, while by lower end The cambered surface that mating protection device inner wall is laterally arranged in pipe joint and protector, which is formed, to be vortexed to reach the mesh of protection pressure sensor , it avoids fluid directly and membrane contacts, reduces noise, improve measurement precision, the utility model principle is simple, system Standby to be easy, easy to use, ideal is isolated with pressure detector for fluid, can reach large-scale production, plays promotion biology doctor Research application of the medicine in relation to biological products pressure monitoring.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model.

Specific embodiment

As shown in Figure 1, a kind of protector of fluid pressure sensor, including protector body, the protector body It is interior to be equipped with cavity, the diaphragm 100 that cavity is divided into first chamber a and second chamber b, diaphragm 100 are equipped in protector body It is made of soft materials, the protector body is externally provided with for connecting detection device pipeline 210 and is connected to first chamber a First connector 200, protector body are externally provided with for connecting fluid pipeline 310 and the second connector for being connected to second chamber b The inner wall of 300, the second chamber b are the cambered surface s that vortex is formed for fluid, and second connector 300 connects second chamber b The tangent setting of cambered surface s of one end and second chamber b inner wall enters in second chamber b, second when fluid passes through the second connector 300 Chamber b forces the pressure in first chamber a to be arranged to detector pipeline 210 and is passed through inspection by the cooperation generation expansion with diaphragm 100 It surveys device (not shown).

The protector body includes upper casing 400 and lower casing 500, and upper casing 400 and lower casing is arranged in the diaphragm 100 Between 500, and the junction of 100 outer of diaphragm and upper casing 400 and lower casing 500 seals and cooperates, and attend class is with the design of lower casing 500 For the ease of the installation of diaphragm 100, if 400 lower casing 500 of upper casing is arranged to integral structure, the assembly difficulty of diaphragm 100 Then can be very big, it is not easy to produce and process.

Pass through welding manner sealing assembly, the seam weldering of junction between the upper casing 400, diaphragm 100 and lower casing 500 Connecing technique can be ultrasonic bonding, thermal compression welding or laser welding process.

First connector 200 is arranged on upper casing 400, and second connector 300 is arranged on lower casing 500, institute The lower casing 500 stated is hemispherical or half elliptic structure, and 400 shape of upper casing can be semicircle, half elliptic, circle without limitation Cylindricality or cone etc., the inner wall surface of lower casing 500 are necessary for forming the cambered surface s or vortex sheet of vortex for fluid.

The plane of described second connector 300 and lower casing 500 is arranged in parallel angle, the purpose that parallel angle is arranged be for Cambered surface s cooperation with second chamber b inner wall forms the purpose of vortex for fluid.

First connector 200 and the second connector 300 is type conical bench connector, convenient for fluid line 310 and detection Device pipeline 210 is connected to the leakproofness of connector, and traditional connection type needs to lock by other modes such as bands, and this product passes through The wedge structure of first connector 200 and the second connector 300 realizes the cooperation with pipeline.

The upper casing 400 and diaphragm 100 forms first chamber a, and first chamber a passes through 200 connecting detection of the first connector Device pipeline 210 is connected to detector, and first chamber a is connected to the fluid channel to form a sealing with detector.

The lower casing 500 and diaphragm 100 forms second chamber b, and second chamber b is connected to fluid by the second connector 300 Pipeline 310, second chamber b and fluid line 310 form the fluid channel of sealing, and that circulates in fluid line 310 can be blood Liquid, digestive juice or nutrient solution etc..

100 surface area of diaphragm is always consistent, and diaphragm 100 is that airtight soft 100 shape of diaphragm can be Hemispherical, butterfly, truncated cone-shaped or irregular type, unified size is arranged at the bottom of these soft diaphragms 100, generally circular in cross section, directly Diameter is identical as the internal diameter of shell；If shell is spherical shape, the height of internal soft diaphragm 100 is no more than shell inner spherical half Diameter, if shell is cone, the height of internal soft diaphragm 100 is no more than the height of internal circular cone, if shell is ellipse Spherical shape, then the height of internal soft diaphragm 100 is no more than internal elliposoidal polar radius, since diaphragm 100 itself does not have elasticity Extension ability and elastic dilatation ability, so the surface area of diaphragm 100 will not change always, only according to the difference of pressure The gauffer degree of diaphragm 100 is different, if diaphragm 100 has elastic extension ability and elastic dilatation ability, diaphragm itself Be resiliently formed certain pressure, influence whether the measurement precision of detector, so the surface area of diaphragm is always consistent, Diaphragm 100 does not have elastic extension ability and elastic dilatation ability is only the state that diaphragm is under normal pressure, but if When pressure is sufficiently large, elastic deformation can all occur for any object, refer to so the surface area of diaphragm 100 is always consistent just Under normal pressure state.

The detector is pressure sensor, and pressure sensor, which refers to, can experience pressure signal, and can be according to certain rule Pressure signal is converted into the device or device of the electric signal of available output by rule, accurately measures out fluid by pressure sensor Pressure.

Abdomen is perfused along abdominal aorta with UW liquid for example, when Adult Pig organ is obtained in the specifically used method of product Portion's organ connects pressure sensor, the pressure of liquid when can measure UW perfusion, the pressure value using this Fluid pressure protector We are understood with the speed and degree, the thrombus degree of abdomen organ of abdomen organ's UW perfusion, and judges abdomen organ's matter The quality of amount has important directive significance.

The utility model has the beneficial effects that the utility model provides a kind of protector of fluid pressure sensor, this product By the way that one end chamber inner wall of protector connecting fluid pipeline is arranged to form the cambered surface of vortex for fluid, while by lower end The cambered surface that mating protection device inner wall is laterally arranged in pipe joint and protector, which is formed, to be vortexed to reach the mesh of protection pressure sensor , it avoids fluid directly and membrane contacts, reduces noise, improve measurement precision.

Basic principles, main features, and advantages of the present invention has been shown and described above.Current row The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments Only illustrate the principles of the present invention, it is on the premise of not departing from the spirit and scope of the utility model, in the art common Simply changing and replacing for technical staff be all within the protection scope of the utility model.

Claims (10)

1. a kind of protector of fluid pressure sensor, including protector body, which is characterized in that in the protector body Equipped with cavity, the diaphragm that cavity is divided into first chamber and second chamber is equipped in protector body, diaphragm is soft materials It is made, the protector body is externally provided with for connecting detection device pipeline and the first connector for being connected to first chamber, protection Device ontology is externally provided with for connecting fluid pipeline and the second connector for being connected to second chamber, and the inner wall of the second chamber is to supply Fluid forms the cambered surface of vortex, and the cambered surface of described second connector connection second chamber one end and second chamber inner wall is tangent to be set It sets, when fluid is entered in second chamber by the second connector, second chamber generates expansion by the cooperation with diaphragm and forces first The indoor gas of chamber, which is arranged to detector pipeline, is passed through detector.

2. a kind of protector of fluid pressure sensor as described in claim 1, which is characterized in that the protector body Including upper casing and lower casing, the diaphragm is set between upper casing and lower casing, and the junction of diaphragm outer and upper casing and lower casing Sealing cooperation.

3. a kind of protector of fluid pressure sensor as claimed in claim 2, which is characterized in that the upper casing, diaphragm It is sealed and is assembled by welding manner between lower casing.

4. a kind of protector of fluid pressure sensor as claimed in claim 2, which is characterized in that first connector is set It sets on upper casing, second connector is arranged on lower casing, and the lower casing is hemispherical or half elliptic structure.

5. a kind of protector of fluid pressure sensor as claimed in claim 4, which is characterized in that second connector with The plane of lower casing is arranged in parallel angle.

6. a kind of protector of fluid pressure sensor as described in claim 1, which is characterized in that first connector with Second connector is type conical bench connector.

7. a kind of protector of fluid pressure sensor as claimed in claim 2, which is characterized in that the upper casing and diaphragm First chamber is formed, first chamber is connected to by the first connector connecting detection device pipeline with detector.

8. a kind of protector of fluid pressure sensor as claimed in claim 2, which is characterized in that the lower casing and diaphragm Second chamber is formed, second chamber passes through the second fittings fluid line.

9. a kind of protector of fluid pressure sensor as described in claim 1, which is characterized in that the membrane surface face Product is always consistent.

10. a kind of protector of fluid pressure sensor as claimed in claim 7, which is characterized in that the detector is Pressure sensor.