CN206146587U - Pressure sensor and plug member that inserts who is used for pressure sensor - Google Patents
Pressure sensor and plug member that inserts who is used for pressure sensor Download PDFInfo
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- CN206146587U CN206146587U CN201620295518.7U CN201620295518U CN206146587U CN 206146587 U CN206146587 U CN 206146587U CN 201620295518 U CN201620295518 U CN 201620295518U CN 206146587 U CN206146587 U CN 206146587U
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- plug
- pressure transducer
- communication paths
- liquid
- sensing element
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Abstract
The utility model relates to a pressure sensor, it includes: a housing. And sensing element, sensing element sets up in the casing, wherein be in be formed with the intercommunication route in the casing, sensing element passes through the intercommunication route with the outside fluid intercommunication of casing is and wherein pressure sensor still is provided with compensation structure, when passing through the intercommunication route gets into the liquid of casing volume expansion appears and when leading to the contact force increase, the compensation structure compensation volume expansion. The utility model discloses still relate to the plug member that inserts who is used for pressure sensor. The technical scheme of the utility model can be holding that liquid in pressure sensor freezes compensate the increase of this kind of volume during the volume increase to prevent the damage of each part of pressure sensor.
Description
Technical field
This utility model is related to sensor field, and specifically, this utility model is related to a kind of pressure transducer, and the pressure is passed
Sensor is mainly used in measuring the pressure of liquid, in particular for measuring the pressure of such as aqueous solution of urea.
This utility model is further related to for the plug of this pressure transducer.
Background technology
The pressure that liquid is measured using pressure transducer is well-known.In measurement process, usual pressure transducer
The liquid of contact measured amount is needed, specifically, liquid inlet pressure sensor simultaneously contacts sensing element, thus measurement obtains liquid
Pressure.
In certain environments, the liquid into pressure transducer may freeze because such as temperature is reduced, and liquid freezes
Form the expansion that solid normally results in volume, this may cause the damage of the part of pressure transducer, especially connect with liquid
The damage of tactile part, for example, cause sensing element to damage.
It is well known that substantial amounts of pollutant effulent may be produced in commercial Application, such as in vehicle, it is possible to create
The substantial amounts of waste gas containing nitrogen oxides (NOx).In order to reduce such exhaust emission, many skills for reducing discharge have been developed
Art.SCR (SCR, selective catalytic reduction) is exactly the one kind being wherein widely used.
In most of selective catalytic reduction system operatings, generally using aqueous solution of urea (AUS, aqueous urea
Solution) as working media, for example with 32.5% aqueous solution of urea reducing amount of nitrogen oxides.In choosing now
In selecting property catalyst reduction system, generally can also be monitored using carbamide pressure transducer (UPS, urea pressure sensor)
The pressure of aqueous solution of urea, to guarantee the normal operation of selective catalytic reduction system operating.During operating process, carbamide pressure is passed
A part (such as sensing element) for sensor is contacted with aqueous solution of urea, thus measures the pressure of aqueous solution of urea.
However, for selective catalytic reduction system operating, the technical problem of a key is, at about -11 DEG C or
Under lower temperature, aqueous solution of urea can freeze.Aqueous solution of urea volume increase after freezing, as a result considerably increases and urine
The contact force of such as sensing element of plain pressure transducer, this may cause contacting with aqueous solution of urea for carbamide pressure transducer
Part (such as sensing element) damage.
In the environment using selective catalytic reduction system operating, for example, it is used in vehicle in selective catalytic reduction system operating
In the case of, it is easy to run into -11 DEG C or lower temperature.In this case, how to tackle aqueous solution of urea freeze for
It is a greatly challenge for the normal operation of selective catalytic reduction system operating.
Utility model content
A purpose of the present utility model is to provide a kind of pressure transducer, especially carbamide pressure transducer, with gram
Take above-mentioned problems of the prior art.
A purpose of the present utility model is to provide a kind of pressure transducer, and it can be contained in pressure transducer
Liquid freeze and volume compensates the increase of this volume when increasing, so as to prevent the damage of each part of pressure transducer.
Another purpose of the present utility model is to provide a kind of pressure transducer, and it can control to be contained in pressure sensing
Liquid in device freeze order, so as to prevent the damage of each part of pressure transducer.
Another purpose of the present utility model is to provide a kind of pressure transducer, and it adopts various supplementary meanss to compensate
Volume increase when liquid freezes in pressure transducer.
A further object of the present utility model is offer for the plug of pressure transducer and manufactures the plug
Method.
Above and other purpose of the present utility model is achieved through the following technical solutions.
This utility model provides a kind of pressure transducer, and it includes：
Housing；And
Sensing element, the sensing element is arranged in the housing；
Communication paths are wherein formed with the housing, the sensing element is by the communication paths and the housing
External fluid connection, and
Wherein described pressure transducer is additionally provided with collocation structure, when the liquid that the housing is entered by the communication paths
When body volumetric expansion occurs and causes contact force to increase, the collocation structure compensates the volumetric expansion.
In one embodiment of pressure transducer, the collocation structure includes increasing the volume of the communication paths
The first collocation structure and/or to control the second collocation structure for freezing order into the liquid of the pressure transducer.
In one embodiment of pressure transducer, first collocation structure includes plug, and the housing is formed with
Manometer tube, wherein the plug is removably engaged in the manometer tube of the housing.
In one embodiment of pressure transducer, the plug is formed with through hole, and the through hole constitutes the connection
At least a portion of path；Or groove is formed with the periphery of the plug, the groove constitutes the communication paths
At least partially；Or forming fluted on the inwall of the manometer tube, the groove coordinates to constitute with the plug
State at least a portion of communication paths.
In one embodiment of pressure transducer, the part to constitute the communication paths of the plug can
Elastic deformation, to change the volume of the communication paths.
In one embodiment of pressure transducer, the chamber for being internally formed closing of the plug.The chamber exists
Be conducive to the molding of plug during the mold forming process of plug.Additionally, the chamber contributes to forming the portion of communication paths
Point deformation and facilitate compensating for the volumetric expansion of liquid in pressure transducer.
In one embodiment of pressure transducer, one end of the close described sensing element of the chamber is provided with chamber
Room covering.The chamber covering contributes to preventing moulding material from entering chamber during the mold forming process of plug.
In one embodiment of pressure transducer, the chamber covering is configured to contribute to the plug cooperation
In the manometer tube of the housing.Such as chamber covering be it is rigid or semirigid, for example can be by rigid or semi-rigid
Material is made, and contributes to forming certain interference fit between plug and manometer tube.
In one embodiment of pressure transducer, second collocation structure is configured to control and enters the pressure
The liquid of force transducer freeze order so that near the sensing element liquid ratio away from the sensing element liquid elder generation
Freeze.
In one embodiment of pressure transducer, second collocation structure is included in the sensing element and the shell
The cavity formed between the manometer tube of body, the cavity is in fluid communication with the communication paths.
In one embodiment of pressure transducer, the surface area-to-volume ratio of the cavity is more than the communication paths
Surface area-to-volume ratio.
In one embodiment of pressure transducer, the table of the surface area-to-volume ratio of the cavity and the communication paths
The ratio of area-volume ratio is 1.25:1 to 3:Between 1.
In one embodiment of pressure transducer, the table of the surface area-to-volume ratio of the cavity and the communication paths
The ratio of area-volume ratio is of about 2:1.
In one embodiment of pressure transducer, the average conduction for forming the material of the cavity is described more than being formed
The average conduction of the material of communication paths.
In one embodiment of pressure transducer, average conduction and the formation company of the material of the cavity is formed
All the ratio of the average conduction of the material on road is of about 35:1 or bigger.
In one embodiment of pressure transducer, the flange that the manometer tube of the housing is formed with a inwardly extending is described
Flange is between the sensing element and the communication paths, and the flange is formed with intercommunicating pore, and the intercommunicating pore constitutes institute
State a part for communication paths.
In one embodiment of pressure transducer, the communication paths are longilineal, in the liquid for reducing receiving
While volume, the deformation of communication paths is also helped.
In one embodiment of pressure transducer, the collocation structure also includes to deform to keep the pressure to pass
3rd collocation structure of the liquid volume in sensor, the 3rd collocation structure includes installation component, and the installation component is arranged
On the lateral surface of the housing, the installation component has elasticity so that in the pressure transducer because liquid volume is swollen
It is swollen and when being acted on by power, the installation component can elastic deformation keeping the liquid volume in the pressure transducer.
This utility model also provides a kind of plug for pressure transducer, and the pressure transducer includes housing and sense
Element is surveyed, the housing is formed with manometer tube, and the sensing element is arranged in the housing, wherein the shape in the manometer tube
Into there is communication paths, the sensing element is connected by the communication paths with external fluid；Characterized in that, the plug
In being removably engaged in the manometer tube of the housing, when there is volume into the fluid of the housing by the communication paths
When expanding and causing contact force to increase, the plug compensates the volumetric expansion.
In one embodiment of plug, the plug is formed with through hole, and the through hole constitutes the communication paths
At least a portion；Or groove is formed with the periphery of the plug, the groove constitutes the communication paths at least
A part.
In one embodiment of plug, the part to constitute the communication paths of the plug being capable of elasticity
Deformation, to change the volume of the communication paths.
In one embodiment of plug, the chamber for being internally formed closing of the plug.The chamber is in plug
Mold forming process during be conducive to the molding of plug.Additionally, the chamber contributes to forming the change of the part of communication paths
Shape and facilitate compensating for the volumetric expansion of liquid in pressure transducer.
In one embodiment of plug, in the end of the close described sensing element of the plug, around institute
State through hole and be formed with annular protrusion outwardly directed from the plug.
In one embodiment of plug, in the within the chamber, it is formed with along the plug axially and radially
The multiple flanks for extending.
In one embodiment of plug, one end of the close described sensing element of the chamber is provided with chamber and covers
Cover material.The chamber covering contributes to preventing moulding material from entering chamber during the mold forming process of plug.
In one embodiment of plug, the chamber covering is configured to contribute to the plug cooperation in institute
In stating the manometer tube of housing.Such as chamber covering be it is rigid or semirigid, for example can be by rigidity or semi-rigid material
Make, contribute to forming certain interference fit between plug and manometer tube.
In one embodiment of plug, the through hole, groove or groove are longilineal, in the liquid for reducing receiving
Volume while, also help the deformation of communication paths.
In one embodiment of plug, the thermal conductivity of the material of the formation plug is less than and forms the sensing
The average conduction of the material of part and the manometer tube.
The method that this utility model further relates to a kind of above-mentioned plug of manufacture, methods described includes：
A, one-shot forming step：Internally there is the main body of closed cavity using elastomeric material；
B, covering step：Chamber covering is placed in closed cavity, to cover the closed cavity；
C, post forming step：Post forming raw material is molded on chamber covering.
In one embodiment of method, methods described also includes fuse step：By one-time formed main body with it is secondary into
Partially fused, the closed cavity of the complete housing of formation and sealing of type.
In one embodiment of method, in one-shot forming step, the axle along plug is formed in closed cavity
To with the multiple flanks for radially extending.
In one embodiment of method, in one-shot forming step, the through hole for running through is formed in main body, or led
Groove is formed on the periphery of body.
In one embodiment of method, in post forming step, in the upper end of main body, around the through hole shape
Into from the outwardly directed annular protrusion of main body.
In one embodiment of method, the post forming raw material is generally annular in shape, is arranged around the through hole.
According to the method institute of pressure transducer of the present utility model, the plug for pressure transducer and manufacture plug
Having the technical effect that for obtaining is significant：
(1) can be deformed to change the volume of communication paths, control to be accommodated in cavity by constituting the part of communication paths
Liquid freeze order, resilient mounting flange of tool etc. be set, the volumetric expansion after liquid freezes can be compensated, it is to avoid
The damage of sensing element etc., even if closed freezing (situation of the liquid full of completely enclosed sensor space most harsh
Under freeze) under, it is also possible to effectively compensate for the volumetric expansion after liquid freezes, prevent the damage of each part of pressure transducer
It is bad；
(2) plug goes for different application requirements (temperature, medium, pressure etc.), and the description more than can be with
See, plug can select material, thermal conductivity etc. according to different application requirements；
(3) rigid covering can provide favourable cooperation, simplify structure；
(4) volumetric expansion when plastic flange or sheet metal flange freeze to liquid can also provide a certain degree of benefit
Repay；
(5) plug has certain motility and versatility, can be used in the application of different configuration and size, from the above
Description can see that plug is mounted to the single part in manometer tube, thus in pressure sensor dimensions and construction
Different application scenarios, can neatly select plug, and plug can be used for other with same size
Pressure transducer, with certain versatility；
(6) plug can be as optional adnexa, without special design.
Description of the drawings
By combining following explanation of the accompanying drawing with reference to this utility model embodiment, above and other feature of the present utility model
Will become more apparent, and be better understood this utility model, wherein：
Figure 1A is the decomposition diagram of the pressure transducer according to this utility model embodiment；
Figure 1B is the perspective view of the pressure transducer according to this utility model embodiment；
Fig. 1 C are that pressure transducer according to this utility model embodiment looks up decomposition diagram；
Fig. 1 D are the face upwarding view of the pressure transducer according to this utility model embodiment；
Fig. 2A is the perspective view of the plug according to this utility model embodiment；
Fig. 2 B are the cross-sectional view of the plug according to this utility model embodiment；
Fig. 2 C are the longitdinal cross-section diagram of the plug according to this utility model embodiment；
Fig. 3 is the sectional view of the pressure transducer according to this utility model embodiment；
Fig. 4 A-4D are the schematic diagram of the pressure transducer according to this utility model another embodiment and its plug；
Fig. 5 A-5B are the schematic diagram of the pressure transducer according to this utility model another embodiment and its plug；
Fig. 6 A are the signal of the general shape of the liquid freezed in the pressure transducer according to this utility model embodiment
Figure；
Fig. 6 B are the signal of the general shape of the liquid freezed in the pressure transducer according to this utility model embodiment
Figure；
The schematic diagram of the step of Fig. 7 A-7D are the formation plug according to this utility model embodiment.
Specific embodiment
Embodiment of the present utility model is described in detail below with reference to accompanying drawing.
According to embodiment of the present utility model, there is provided a kind of pressure transducer, it is mainly used in measuring the pressure of liquid,
When liquid freezes, especially in the case where liquid carries out closed freezing, can keep each part of pressure transducer not by
Damage.For example, in vehicle, in order to reduce exhaust emissions in nitrogen oxides, generally using selective catalytic reduction system operating,
Generally using aqueous solution of urea as working media in selective catalytic reduction system operating.Pressure transducer of the present utility model can
To be applied to this selective catalytic reduction system operating, as aqueous solution of urea pressure transducer, even if in harsh closed jelly
In the case of knot, pressure transducer also will not be damaged.Certainly, pressure transducer of the present utility model is not limited to above-mentioned application.
In fact, it will be understood by those skilled in the art that above-mentioned being merely examples property of aqueous solution of urea, this practicality is new
The pressure transducer of type can be used for measuring the pressure of various liquid.
Figure 1A -1D respectively illustrate the decomposition diagram of the pressure transducer 1 according to this utility model embodiment, perspective
Scheme, look up decomposition diagram and face upwarding view.
As illustrated, generally comprising housing 100 and sensing element according to the pressure transducer 1 of this utility model embodiment
200 (not shown in Figure 1A -1D, referring to Fig. 3).Sensing element 200 is installed in a housing 100.
Fig. 3 shows the sectional view of the pressure transducer 1 according to this utility model embodiment.With reference to Fig. 3, housing 100
Upper part is formed with housing chamber 110, and in the illustrated embodiment, the housing chamber 110 is substantial cylindrical, but is not limited to
This, it will be understood by those skilled in the art that housing chamber can also for such as cuboid, square, taper and Else Rule or
It is irregularly shaped.Sensing element 200 is contained in the housing chamber 110, in operation, the sensing element 200 and liquid (example
Such as aqueous solution of urea) contact, to the pressure for sensing liquid.
In most of the cases, sensing element 200 is fixedly provided in housing 100, that is, sensing element 200 is relative
It is fixed in housing 100, coordinates other parts to form rigid closed construction.In the illustrated embodiment, sensing element
200 are rigidly secured in housing chamber 110.
Pressure transducer 1 also include electrical fitting 400, the electrical fitting 400 be arranged on sensing element 200 and
It is electrically connected with sensing element 200, to transmit the pressure signal of the sensing of sensing element 200.
The low portion of housing 100 is formed with manometer tube 120, and in the illustrated embodiment, the manometer tube 120 is also substantially to justify
Cylindricality, but be not limited to this, those skilled in the art can according to actual needs select other pressure tube shapes, including but not
It is limited to cuboid, square, taper etc..The size for being smaller in size than housing chamber 110 of manometer tube 120, thus in the He of manometer tube 120
Shoulder 130 is formed between housing chamber 110.Sensing element 200 is positioned adjacent to the shoulder 130.
In a preferred embodiment, in order to prevent liquid (such as aqueous solution of urea) in housing chamber 110 pass through sensing
Part 200 is leaked at electrical fitting 400, and inner seal 201 can be provided between sensing element 200 and shoulder 130.
Communication paths are formed with manometer tube 120, sensing element 200 is connected by the communication paths with external fluid.
During pressure transducer 1 is operated, pressure transducer 1 is contacted with liquid to be measured.Liquid to be measured is partly into
To contact sensing element 200, thus sensing element 200 can measure the pressure of liquid to pressure transducer 1.Specifically, liquid Jing
Pressure transducer 1 is entered by communication paths and contact sensing element 200, it is logical in connection thus during the operation of pressure transducer 1
There is liquid in road, and liquid contacts to measure the pressure of liquid with sensing element 200.
In one embodiment, manometer tube 120 itself can form communication paths, and liquid to be measured passes through manometer tube
120 are directly entered pressure transducer and contact with sensing element 200.In other embodiments, can by other structure come
The communication paths are formed, this will be described in detail further below.
When the operating environment of pressure transducer 1 changes, for example when the temperature decreases, liquid to be measured may
Freeze (such as freeze), it will be understood by those skilled in the art that liquid freeze typically result in such as expansion and volume increase.And
This volume increase is most likely to damage the part contacted with liquid, such as sensing element 200, so as to build-up of pressure sensor
Damage.
Thus, according to embodiment of the present utility model, pressure transducer 1 is additionally provided with collocation structure, when logical by connection
Road into the liquid of pressure transducer 1 there is change in volume when, the collocation structure compensates this change in volume.For example, as above institute
State, when whne liquid liquid because temperature is reduced when freezing, volumetric expansion, now the collocation structure of pressure transducer 1 can be with
The such volumetric expansion of compensation, it is to avoid the damage of the part contacted with liquid.Certainly, it will be appreciated by those skilled in the art that on
Stating temperature reduces causing what change in volume was merely exemplary, and the collocation structure in pressure transducer of the present utility model can also
For compensation due to liquid volume change caused by other reasons.
According to principle of the present utility model, collocation structure can have various ways, at least can include changing (example
As increased) the first collocation structure of the volume of communication paths, control freezes the second of order into the liquid of pressure transducer
Collocation structure and/or can deform to keep the 3rd collocation structure of liquid volume in pressure transducer.Though these collocation structures
It is slightly different in right structure and principle, but contribute to compensate this when change in volume occurs in the liquid into pressure transducer
Plant change in volume.These exemplary collocation structures described in detail below, it will be appreciated by those skilled in the art that these compensation
Structure both can individually work, it is also possible to combine to obtain more preferable compensation effect.Meanwhile, those skilled in the art are also
It should be appreciated that these being merely examples property of collocation structure, and nonrestrictive, without departing from spirit of the present utility model and
In the case of scope, it is contemplated that other compensating forms.
In embodiment of the present utility model, the first collocation structure can include plug 300, connector described in detail below
Embodiment of the part 300 as collocation structure.
Plug 300 is removably engaged in the manometer tube 120 of housing 100, the shape and manometer tube of plug 300
120 shape substantially matches, i.e., in the illustrated embodiment, plug 300 is also substantial cylindrical, but is not limited to this,
Those skilled in the art can according to actual needs select other pressure tube shapes, including but not limited to cuboid, square,
Taper etc..
Fig. 2A -2C respectively illustrate the perspective view of the plug 300 according to this utility model embodiment, cross-sectional view and vertical
To sectional view.Plug 300 have first end 311, the second end 312 and first end 311 and the second end 312 it
Between the lateral wall 301 that extends, first end 311, the second end 312 and lateral wall 301 constitute substantial cylindrical.
Plug 300 is formed with through hole 303, and the through hole 303 is along the axially extending of plug 300.Through hole 303 constitutes institute
State at least a portion of communication paths, liquid to be measured via through hole 303 enter pressure transducer 1 and with sensing element 200
Contact.In one embodiment, communication paths are made up of completely through hole 303, and such liquid directly enters pressure by through hole 303
Sensor 1.In other embodiments, through hole 303 can together constitute communication paths with other structures, and this will hereinafter enter
One step is described.
In the illustrated embodiment, the center of plug 300 is formed with through hole 303, however, this is merely exemplary
, it will be understood by those skilled in the art that the position of through hole 303 is not limited to be located at the center of plug 300, it can also position
In the other positions of plug 300, for example, deviate the longitudinal axis of plug 300.The position of through hole 303 can be according to actual need
Selected.
The part to constitute communication paths of plug 300 can elastic deformation, so as to (concrete by communication paths
Ground, through plug 300) into pressure transducer 1 liquid occur change in volume (such as the liquid in pressure transducer due to
Freeze and volumetric expansion) when, this part of plug 300 carries out elastic deformation, to change the volume of communication paths, so as to mend
Repay this change in volume.
The hole wall 302 of through hole 303 is formed on the inside of lateral wall 301, hole wall 302 and lateral wall 301 are in first end 311
Connect with the second end 312, to form the chamber 304 of hollow closing between hole wall 302 and lateral wall 301.Also
It is, the chamber 304 for being internally formed closing of plug 300.One of this closed chamber being internally formed acts predominantly on
In the elastic deformation for accommodating communication paths, for example, it is used for the deformation of receiving opening 303 in the present embodiment.
For example, for the embodiment of such as Fig. 3, when liquid due to freeze and volume increase when, in through hole 303
Liquid volume increase, now hole wall 302 can elastic deformation, for example diagram orientation in along plug radial direction become
Shape, increases the volume of through hole 303, and the volume of the liquid that through hole 303 can be accommodated is increased then, so as to the volume for compensating liquid increases
Greatly.When hole wall 302 deforms, chamber 304 can accommodate this deformation, such that it is able to further such that hole wall 302 can
Easier and faster deform.
In a preferred embodiment, the chamber 304 of closing can be formed around communication paths, such as around the shape of through hole 303
Into to facilitate the deformation for accommodating hole wall 302.
During plug molding, the molding and the demoulding of lateral wall and hole wall for convenience, in chamber 304, in hole wall
The multiple flanks 305 for axially and radially extending along plug 300 are connected between 302 and lateral wall 301.These flanks
305 can be symmetrically distributed around hole wall 302, and to facilitate the molding of plug, the operation can adopt as known in the art
Method, here is not described in detail.
As shown in Figure 2 C, in chamber 304, in one end of the close sensing element 200 of chamber 304, i.e., in first end
Between 111 and flank 305, chamber covering 307 is provided with, a purpose for arranging the chamber covering 307 is, in connector
Moulding material is avoided to enter chamber during part molding.
With reference to Fig. 3 is referred to, when plug 300 coordinates in manometer tube 120, the first end 311 of plug 300 is close
Sensing element 200 is positioned, and the second end 312 is positioned away from sensing element 200.In this case, as shown in figure 3, through hole 303
Generally perpendicularly position relative to sensing element 200, sensing element 200 is connected by the through hole 303 and the outside of pressure transducer
It is logical.
Cavity 202 is formed between sensing element 200 and manometer tube 120, specific to the embodiment of Fig. 3, in sensing
Cavity 202 is formed between part 200, housing 100 and plug 300, the cavity 202 is connected with through hole 303.Work as pressure transducer
1 be arranged on such as selective catalytic reduction system operating in when, liquid via through hole 303 enter cavity 202, thus with sensing element
200 contact, so as to pressure transducer can measure the pressure of liquid.However, it will be understood by those skilled in the art that cavity
202 it is not necessary to, liquid with sensing element 200 by directly contacting after through hole 303.The setting of cavity is another
A form of collocation structure, this will be described below.
According to embodiment of the present utility model, forming the hole wall 302 of through hole 303 can deform, to change the body of through hole 302
Product.In one embodiment, hole wall 302 is formed by the material of elastically deformable, such as but not limited to by rubber, plastics or thermoplastic
Property material is formed.So, when ambient temperature is under -11 DEG C or lower temperature, (for example carbamide is water-soluble for liquid to be measured
Liquid) can freeze, thus, the volume increase of the liquid in through hole 303 and cavity 202.If plug 300 is also rigid structure,
The liquid for so expanding applies the contact force of increase to sensing element 200, thus may cause the damage of at least sensing element 200
It is bad.In fact, each part contacted with liquid of pressure transducer is likely to be damaged because contact force increases.In this practicality
In new embodiment, hole wall 302 can deform, so, liquid can freeze and volume increase in the case of, hole wall 302 becomes
Shape, increases the volume of through hole 303, that is, increase the amount of the liquid accommodated in through hole 303, has thereby compensated for liquid due to freezing
Caused volume increase, prevents the damage of each part of caused pressure transducer due to contact force increase.
Description according to more than can be seen, even if (namely may cause in the case of above-mentioned rigid closed construction
It is closed to freeze), the construction of plug also can compensate for the volume increase of liquid, so as to prevent each part of pressure transducer
Damage.
For a specific embodiment, Fig. 3 is refer to, under the construction of the embodiment, when liquid freezes, the body of liquid
Product increase can cause the contact force for applying vertically to sensing element 200, however, due to sensing element 200 be rigidly connected and
Hole wall 302 can deform, so now liquid volume increase can extrude hole wall 302 and cause hole wall 302 radially deformed first,
Now, due to having chamber 304 in plug 300 so that hole wall 302 can radially deform, so that through hole 303
Volume increase, increased with the volume for compensating liquid, prevent the damage of each part of pressure transducer especially sensing element 200
It is bad.
Certainly, accordingly deformation is not limited to above-mentioned concrete structure for the contact force applied when liquid volume increases and hole wall
Make, i.e., being not necessarily in other applications to the axially contact power of sensing element applying and hole wall carries out radial deformation.In fact, root
According to this utility model, when liquid volume increases, as long as hole wall deformation is so that the volume increase of through hole, can compensate for liquid
Volume increases, it is possible to prevent the damage of each part of pressure transducer.
Additionally, the volume that through hole 303 can be formed as longilineal, to accommodate in reduction liquid (can reduce then
Volume increase when liquid freezes) while, also help the deformation of hole wall 302.
Fig. 4 A-4D show the pressure transducer and its plug according to this utility model another embodiment.
The agent structure of the embodiment with it is substantially similar shown in Fig. 3, difference essentially consists in being used for for plug 300
Constitute the part of communication paths.Therefore, it is no longer detailed with the embodiment identical part here of Fig. 3 in the embodiment of Fig. 4 A-4D
Description, and the parts different from the embodiment of Fig. 3 are only described.
In the embodiment of Fig. 4 A-4D, groove 351 is formed with the periphery of plug 300, the groove 351 constitutes described
At least a portion of communication paths.The groove 351 be also it is longilineal, reduce accommodate liquid volume while, also
Beneficial to the deformation of groove 351.
In a further embodiment, on one end of plug 300, such as in the close sensing element of plug 300
On 200 end, rake 352 is provided with, can be seen with reference to Fig. 4 D, the rake 352 also constitutes of communication paths
Point, liquid enters pressure transducer 1 and contacts with sensing element 200 via groove 351 and rake 352.
However, it is understood by those of ordinary skill in the art that, the rake it is not necessary to, its structure only to facilitate with
General manometer tube coordinates.
Fig. 5 A-5B show the pressure transducer and its plug according to this utility model another embodiment.
This example show another form of collocation structure.Fluted 125 are formed on the inwall of manometer tube 120.
Now, plug 300 can be not provided with through hole or groove.In fact, in this case, plug 300 itself and groove
125 coordinate at least a portion that can form communication paths.As shown in Figure 5 B, liquid enters pressure transducer via groove 125
And contact with sensing element 200.
Groove 125 preferably can also be longilineal, while the volume of the liquid for accommodating is reduced, also help slotting
The deformation of the part coordinated with groove 125 of plug member 300.
Another kind of collocation structure of the present utility model described in detail below, i.e. the second collocation structure, second collocation structure
It is configured to control to freeze order into the liquid of pressure transducer, makes the liquid arm of close sensing element away from sensing
The liquid of element first freezes.So, the liquid near sensing element freezes in advance, caused volumetric expansion make partially liq from
Communication paths are discharged, and then the volume of the liquid in pressure transducer and the liquid for freezing does not increase, will not breakdown pressure
The part contacted with liquid of sensor.Meanwhile, the liquid near sensing element freezes in advance, and the liquid after freezing is now to sense
Survey element and form protective effect, subsequent liquid freezes caused volumetric expansion will not produce impact to sensing element, further
Sensing element is prevented to be destroyed due to volumetric expansion.
Second collocation structure is included in the cavity 202 formed between sensing element 200 and manometer tube 120, the cavity 202
It is in fluid communication with communication paths, the surface area-to-volume ratio of cavity 202 is more than the surface area-to-volume ratio of communication paths.
Damage of the volume increase to pressure transducer each part during in order to further prevent liquid from freezing, it may be considered that control
The liquid of receiving freezes order in pressure transducer.For example, the liquid in cavity 202 is made first freezes, then through hole 303
In liquid freeze again in the case of, can further reduce when liquid freezes to the impact of each part of sensor.
Specifically, with reference to reference to Fig. 6 A and 6B, it illustrates freezing of being formed when liquid freezes in the structure shown in Fig. 3
Partial schematic diagram.
When liquid freezes in the structure shown in Fig. 3, the frozen fraction for being formed can be divided into two parts, and first freezes
The frozen fraction 502 of knot point 501 and second.First frozen fraction 501 is the liquid portion freezed in cavity 202, and second freezes
Knot point 502 is the liquid portion freezed in through hole 303.Therefore, the shape of the shape of the first frozen fraction 501 and cavity 202
Shape is corresponding, and the shape of the second frozen fraction 502 is corresponding with the shape of through hole 303.In this case, shown in Fig. 6 A and 6B
Shape be actually also cavity 202 and through hole 303 shape.
For the purpose of simplifying the description, by taking the construction of the cavity 202 shown in Fig. 3 and through hole 303 as an example illustrating how to control liquid
Freeze order.
First frozen fraction 501 and the second frozen fraction 502 are substantial cylindrical.Assume the first frozen fraction 501
Radius is R, is highly x, then the surface area of the first frozen fraction 501 is 2 π R2+ 2 π Rx, volume is π R2X, then first
The surface area-to-volume ratio of frozen fraction 501 is：
It is similarly assumed that the radius of the second frozen fraction 502 is r, it is highly h, then the surface area of the second frozen fraction 502
For 2 π r2+ 2 π rh, volume is π r2H, then the surface area-to-volume ratio of the second frozen fraction 502 be：
In most sensor application, dashed rectangle part is limited to the size of sensor and sets in both the above formula
Count and may be considered definite value, and generally R<H, therefore, by the size for designing x and r, for example, cause x<R, then can
So that surface area-to-volume ratio of the surface area-to-volume ratio of the first frozen fraction 501 more than the second frozen fraction 502.And if
So that x is much smaller than r, then the surface area-to-volume ratio that can cause the first frozen fraction 501 is much larger than the second frozen fraction 502
Surface area-to-volume ratio, i.e.,
Accordingly, the surface area-to-volume ratio of cavity 202 is more than the surface area-to-volume ratio of through hole 303, or cavity 202
Surface area-to-volume ratio much larger than through hole 303 surface area-to-volume ratio.
In general pressure transducer, R can be about 1 to 15, r and can be about 0.2 to 5, r can be about
0.25 to 15, h can be 0.5 to 20.In such sensor, the surface area-to-volume ratio of cavity 202 and the table of through hole 303
The ratio of area-volume ratio preferably can be 1.25:1 to 3:Between 1, you can preferably control liquid freezes suitable
Sequence.
In the particular embodiment, R can be chosen to 4.5, x can be chosen to 0.5, r and can be chosen to 1, h to select
Into 10, so, the surface area-to-volume ratio of cavity 202 is close to about 2 with the ratio of the surface area-to-volume ratio of through hole 303:1.
Surface area-to-volume ratio can measuring as liquid heat transfer (cooling) speed of unit volume (quality), numerical value is got over
Greatly, conduct heat faster, it is more early to freeze (on the premise of the coefficient of heat conduction difference of contact interface is not considered).Therefore, by upper
Design is stated, the liquid in cavity 202 can be caused to freeze first, that is, freezed first near the liquid of sensing element 200, so
Afterwards the liquid in through hole 303 freezes again.
In the case that liquid in cavity 202 freezes first, now due to freezing, caused volume increases due to logical
Liquid in hole 303 does not freeze and obtains certain compensation so that the volume of cavity 202 will not increase, therefore, the liquid for freezing
The contact force of increase will not be applied to such as sensing element 200, so as to prevent the damage of each part of pressure transducer.
More than be for Fig. 3 embodiment describe collocation structure for control freezing order and compensate when liquid freezes
Volume increases.It will be understood by those skilled in the art that the above-mentioned collocation structure for control freezing order may be equally applicable for
Other embodiments, such as, for the embodiment of Fig. 4 A-4D and 5A-5B, the surface area-to-volume ratio of cavity 202 is more than groove 351
Surface area-to-volume ratio, more than the surface area-to-volume ratio of groove 125, can obtain above-mentioned technique effect.And in manometer tube
120 are provided with flange 121 and in the case that flange 121 is provided with intercommunicating pore 126, and the surface area-to-volume ratio of cavity 202 is more than logical
Hole 303, groove 351 or groove 125 can equally obtain above-mentioned technique effect plus the surface area-to-volume ratio of intercommunicating pore 126.
Except being more than the surface area-to-volume ratio of communication paths come control freezing by configuring the surface area-to-volume ratio of cavity
Outside order, or carry out control freezing more than the surface area-to-volume ratio of communication paths as the surface area-to-volume ratio for configuring cavity
The replacement scheme of order, in a preferred embodiment, is selected, it is also possible to control pressure by the material of each part of pressure transducer
The liquid of receiving freezes order in sensor.Specifically so that the thermal conductivity of cavity can be with more than the thermal conductivity of communication paths
Control liquid freezes order.
Herein, the thermal conductivity of cavity refers to the average conduction of the part contacted with liquid of cavity (namely
Form the average conduction of the material of cavity), the thermal conductivity of communication paths refers to the part contacted with liquid in communication paths
Average conduction (namely formed communication paths material average conduction).
For example, by the selection of material so that the average conduction of the part near cavity 202 is more than near through hole 303
Part average conduction.So, the thermal conductivity of the part near cavity 202 is big, and heat transfer is fast so that the liquid in cavity 202
Body freezes first, and the thermal conductivity of the part near through hole 303 is little, and heat transfer is slow so that freeze after the liquid in through hole 303, therefore,
Equally order can be freezed with the liquid that accommodates in control pressure sensor, obtain above-mentioned technique effect.
Specifically, for one embodiment of the present utility model, such as the embodiment shown in Fig. 3 forms sensing element 200
It is more than the thermal conductivity of the material for forming plug 300 with the average conduction of the material of housing 100, or perhaps forms plug
Average conduction of the thermal conductivity of 300 material less than the material for forming sensing element 200 and housing 100.For example, sensing element
200 and housing 100 can be formed by the higher plastics of metal or thermal conductivity, or can by ceramics or semi-conducting material be formed,
And plug 300 is made up of the relatively low rubber of thermal conductivity or plastics.In the case where there is sealing member 201, the sealing member is by example
As rubber is made.
So, the average conduction for forming the material of the part of cavity is flat higher than the material of the part for forming communication paths
Equal thermal conductivity.
In a specific embodiment, the material of the part for contacting with liquid selects as follows.Sensing element 200 is by ceramic
Into sealing member 201 is made up of rubber, and manometer tube 102 is made of metal, and plug 300 is made up of rubber, so, forms cavity
Part material average conduction and the ratio of average conduction of the material of the part for forming communication paths be of about 35:1,
I.e. the average conduction of cavity and the ratio of the average conduction of communication paths are of about 35:1.Sense is enough to ensure that in this case
The liquid surveyed near element first freezes.And if the average conduction of cavity is more than with the ratio of the average conduction of communication paths
35:1, then more easily ensure that the liquid near sensing element first freezes, and prevent the damage of sensing element.
Can see from the description above, cavity 202 is formed between sensing element 200, housing 100 and plug 300,
Namely a part for plug 300 is used for forming cavity 202, in the fig. 3 embodiment, the first end 311 of plug 300
Surface be used for forming the part of cavity 202.
In this case, the liquid in cavity 202 some contact with the first end 311 of plug 300, therefore
The freezing speed of this part is affected by the material of plug 300 and is become slower.Freeze to further enhance above-mentioned control
Technique effect produced by knot speed, it may be considered that using following measure.
The flange 121 that the manometer tube 120 of housing 100 is formed with a inwardly extending, the flange 121 in sensing element 200 with
Between communication paths, intercommunicating pore 126 is formed with flange 121, the intercommunicating pore 126 constitutes a part for communication paths.For example,
In the case of the above embodiments, liquid enters pressure transducer 1 via through hole 303, groove 351 or groove 125, and then passes through
Intercommunicating pore 126 in flange 121, and contact with sensing element 200.
In the case where plug 300 is formed with through hole 303, at the first end 311 of plug 300, around through hole
303 are formed with annular protrusion 306 outwardly directed from first end 311.
The flange 121 covers the first end 311 of plug 300 around the annular protrusion 306 of plug 300.So,
First end 311 before annular protrusion 306 and the replacement of flange 121 is forming the part of cavity 202.So, in operation
Process, the part that the liquid in cavity 202 is contacted with plug 300 greatly reduces.
However, above-mentioned annular protrusion it is not necessary to, without in the case of annular protrusion 306, flange 121 covers
Lid plug 300, as shown in Fig. 4 D and 5B.
Flange 121 can be formed by the higher material of thermal conductivity, for example, formed by the higher plastics of metal or thermal conductivity.By
This further improves the thermal conductivity of the part contacted with the liquid in cavity 202, so as to further enhancing control freezing speed
Produced technique effect.
Certainly, the effect for strengthening control freezing speed is not limited to the measure of the above, can also adopt other modes.Example
Such as, in order to reduce the part contacted with the liquid in cavity of plug, plug can be set in first end using two-piece type
Meter, i.e., at the first end of plug, be formed with annular protrusion outwardly directed from first end, while carrying around through hole
For such as metal covering, cover the first end of plug around the annular protrusion and be fixedly connected to the first end
Portion.
In the case where plug is by for example rubber is made, because rubber has elasticity, in plug housing is coupled to
When in manometer tube, plug there is a possibility that from manometer tube to come off to a certain extent because of its elasticity.For this purpose, chamber
Room covering 307 is rigid or semirigid, for example, can be made up of rigidity or semi-rigid material, including but not limited to rubber
Glue, plastics, metal, ceramic lamp.Rigid or semirigid chamber covering 307 is against lateral wall 301 and to the lateral wall 301
Apply outwardly radial power and extrude lateral wall 301, so, when plug 300 is removably coupled in manometer tube 120,
Such structure can form certain interference fit between plug 300 and manometer tube 120, to contribute to plug 300
In being snugly fit inside the manometer tube 120 of housing 100, so as to significantly reduce the risk that plug comes off from manometer tube.At this
In the case of kind, it is not necessary to which extra fit structure is guaranteeing the tight fit of plug and manometer tube.
More than in addition to the first and second collocation structures, embodiment of the present utility model can also have other compensation
Structure, such as the 3rd collocation structure.3rd collocation structure can include installation component, and the installation component is used for pressure sensing
Device is installed in the environment that it is applied.
Installation component is arranged on the lateral surface of the housing of pressure transducer, and installation component has elasticity so that in pressure
Sensor is acted on (such as because the liquid into pressure transducer freezes caused volumetric expansion to pressure transducer by power
The power of applying) when, installation component can elastic deformation, to keep the liquid volume in pressure transducer constant.
Installation component can take various forms, if its can elastic deformation, for example to compensate caused by liquid freezes
Volumetric expansion.For example, installation component below can will come detailed with mounting flange in the form of mounting flange as example
3rd collocation structure of the present utility model is described, it will be recognized to those skilled in the art that installation component as herein described is simultaneously
It is not limited to mounting flange.
As illustrated, in a preferred embodiment, be provided with the lateral surface of housing 100 mounting flange 140 for use as
3rd collocation structure, for example, on the lateral surface of the housing chamber 110 of housing 100 mounting flange 140 is provided with.The mounting flange
140 have elasticity, can be made up of elastomer, for example, can be made up of elastoplast or sheet metal so that in pressure transducer 1
When being acted on by power, mounting flange 140 being capable of elastic deformation.
Installing hole 141 is formed with mounting flange 140, pressure transducer passes through the installing hole 141 on mounting flange 140,
It is installed to via securing member on such as selective catalytic reduction system operating.When the liquid in sensor freezes, due to liquid
Volume increase and the contact force of increase is produced in sensor, due to mounting flange 140 can elastic deformation, so in contact force
In the case of increase, mounting flange 140 is resiliently flexible so that sensor can be along the direction position of mounting flange deformation
Move, so as to the liquid in sensor is partly removed from sensor during volumetric expansion freezing, make to stay in sensing as far as possible
The volume of the liquid in device keeps constant, and to partially compensate for volume when liquid freezes brought impact is increased, and further subtracts
Less or prevent the damage of pressure transducer each several part.
Below with reference to Fig. 7 A-7D, describe according to the method for forming plug of the present utility model, Fig. 7 A-7D are root
According to this utility model embodiment formation plug the step of schematic diagram.
According to this utility model, a kind of method of manufacture plug 300 is also provided, the method includes：
A, one-shot forming step：Internally there is the main body of closed cavity using elastomeric material；
B, covering step：Chamber covering is placed in closed cavity, to cover the closed cavity；
C, post forming step：Post forming raw material is molded on chamber covering.
According to preferred scheme, said method can also include fuse step：By one-time formed main body and post forming
It is partially fused, form the closed cavity of complete housing and sealing.
In detail below for the embodiment of such as Fig. 3 explaining the detailed step of said method.In the plug 300 of Fig. 3
In the case of, its forming step includes：
A, one-shot forming step：Main body 310 of the molding with internal cavities 313 and through hole 303, the main body 310 has outer
The hole wall 302 of side wall 301 and formation through hole 303, forms the hole wall 302 of through hole 303 in the inner side of lateral wall 301, the He of hole wall 302
The internal cavities 313 are formed between lateral wall 301.Hole wall 302 and lateral wall 301 connect in lower end.In hole wall 302 and outward
The multiple flanks 305 for axially and radially extending along plug 300 are connected between side wall 301.These flanks 305 can be around
Hole wall 302 to be symmetrically distributed, to facilitate the molding of plug, the operation can adopt method as known in the art, here
It is not described in detail.
B, covering step：Chamber covering 307 is placed on into the upper end of main body 310, to cover internal cavities 313.
One purpose of the chamber covering 307 is to avoid moulding material from entering chamber during plug molding.Chamber covering
307 can be rigid, for example, can be made up of rigid material, and to contribute to plug 300 housing 100 is snugly fit inside
In manometer tube 120.
C, post forming step：Post forming raw material 330 is molded into into the upper of main body 310 in the top of chamber covering 307
End.The post forming raw material 330 is generally annular in shape, is arranged around hole wall 302 and through hole 303.
D, fuse step：One-time formed main body is partially fused with post forming, form complete housing and sealing
Internal cavities, i.e. hollow structure.The plug with the structure above with reference to described in Fig. 2A -2C is formed after fusion.
And the embodiment of such as Fig. 4 A-4D is directed to, and method is substantially similar, and difference is, in one-shot forming step,
Groove is formed on the periphery of main body, rather than through hole is formed in main body.
Further, in the case where rake 352 is provided with, in one-shot forming step, post forming step and fusion
The rake is formed in step.
According to the method institute of pressure transducer of the present utility model, the plug for pressure transducer and manufacture plug
Having the technical effect that for obtaining is significant：
(1) can be deformed to change the volume of communication paths, control to be accommodated in cavity by constituting the part of communication paths
Liquid freeze order, resilient mounting flange of tool etc. be set, the volumetric expansion after liquid freezes can be compensated, it is to avoid
The damage of sensing element etc., even if closed freezing (situation of the liquid full of completely enclosed sensor space most harsh
Under freeze) under, it is also possible to effectively compensate for the volumetric expansion after liquid freezes, prevent the damage of each part of pressure transducer
It is bad；
(2) plug goes for different application requirements (temperature, medium, pressure etc.), and the description more than can be with
See, plug can select material, thermal conductivity etc. according to different application requirements；
(3) rigid covering can provide favourable cooperation, simplify structure；
(4) volumetric expansion when plastic flange or sheet metal flange freeze to liquid can also provide a certain degree of benefit
Repay；
(5) plug has certain motility and versatility, can be used in the application of different configuration and size, from the above
Description can see that plug is mounted to the single part in manometer tube, thus in pressure sensor dimensions and construction
Different application scenarios, can neatly select plug, and plug can be used for other with same size
Pressure transducer, with certain versatility；
(6) plug can be as optional adnexa, without special design.
Although it will be appreciated by those skilled in the art that the foregoing describing multiple embodiments, these embodiments are belonged to
In the range of general idea of the present utility model.Do not exist it is clearly contradicted in the case of, one or more skills of one embodiment
Art feature can be advantageously incorporated in other embodiments, without departing from scope of the present utility model.In all embodiments
Technical characteristic can be deleted and be combined to form new embodiment, these new embodiments are still within this utility model
In the range of.
Although by this utility model, as an example property design is described, it is also possible in the spirit of the disclosure and
In the range of this utility model is modified.Therefore this utility model is intended to using any of this utility model General Principle
Modification pattern, purposes or adaptive version.
Claims (28)
1. a kind of pressure transducer, it includes：
Housing；And
Sensing element, the sensing element is arranged in the housing；
Communication paths are wherein formed with the housing, the sensing element is outer with the housing by the communication paths
Portion is in fluid communication, and
Wherein described pressure transducer is additionally provided with collocation structure, when the liquid discharge that the housing is entered by the communication paths
When showing volumetric expansion and causing contact force to increase, the collocation structure compensates the volumetric expansion.
2. pressure transducer according to claim 1, it is characterised in that the collocation structure includes increasing the company
First collocation structure of the volume on road and/or to control to freeze the of order into the liquid of the pressure transducer all
Two collocation structures.
3. pressure transducer according to claim 2, it is characterised in that first collocation structure includes plug, institute
State housing and be formed with manometer tube, wherein the plug is removably engaged in the manometer tube of the housing.
4. pressure transducer according to claim 3, it is characterised in that the plug is formed with through hole, the through hole
Constitute at least a portion of the communication paths；Or groove is formed with the periphery of the plug, the groove constitutes institute
State at least a portion of communication paths；Or form fluted on the inwall of the manometer tube, the groove and the plug
Coordinate to constitute at least a portion of the communication paths.
5. pressure transducer according to claim 4, it is characterised in that the plug it is logical to constitute the connection
The part on road can elastic deformation, to change the volume of the communication paths.
6. the pressure transducer according to any one of claim 3-5, it is characterised in that the plug is internally formed
There is the chamber of closing.
7. pressure transducer according to claim 6, it is characterised in that in the close described sensing element of the chamber
One end is provided with chamber covering.
8. pressure transducer according to claim 7, it is characterised in that the chamber covering is configured to contribute to
The plug coordinates in the manometer tube of the housing.
9. the pressure transducer according to any one of claim 2-5 and 7-8, it is characterised in that the second compensation knot
Structure is configured to control to freeze order into the liquid of the pressure transducer, so that near the liquid of the sensing element
Body ratio first freezes away from the liquid of the sensing element.
10. the pressure transducer according to any one of claim 2-5 and 7-8, it is characterised in that the second compensation knot
Structure is included in the cavity formed between the manometer tube of the sensing element and the housing, the cavity and the communication paths stream
Body is connected.
11. pressure transducers according to claim 10, it is characterised in that the surface area-to-volume ratio of the cavity is more than
The surface area-to-volume ratio of the communication paths.
12. pressure transducers according to claim 11, it is characterised in that the surface area-to-volume ratio of the cavity and institute
The ratio of surface area-to-volume ratio of communication paths is stated 1.25:1 to 3:Between 1.
13. pressure transducers according to claim 11, it is characterised in that the surface area-to-volume ratio of the cavity and institute
The ratio for stating the surface area-to-volume ratio of communication paths is of about 2:1.
14. pressure transducers according to any one of claim 11-13, it is characterised in that form the material of the cavity
Average conduction of the average conduction of material more than the material for forming the communication paths.
15. pressure transducers according to claim 14, it is characterised in that form the average heat conduction of the material of the cavity
Rate is 35 with the ratio of the average conduction of the material for forming the communication paths:1 or bigger.
16. pressure transducers according to claim 14, it is characterised in that the manometer tube of the housing is formed with and inwardly prolongs
The flange stretched, the flange is between the sensing element and the communication paths, and the flange is formed with intercommunicating pore, described
Intercommunicating pore constitutes a part for the communication paths.
17. pressure transducers according to claim 1, it is characterised in that the communication paths are longilineal.
18. pressure transducers according to any one of claim 2-5,7-8,11-13 and 15-17, it is characterised in that institute
Stating collocation structure also includes to deform to keep the 3rd collocation structure of the liquid volume in the pressure transducer, described
3rd collocation structure includes installation component, and the installation component is arranged on the lateral surface of the housing, the installation component tool
It is flexible so that when the pressure transducer is acted on because liquid volume expands by power, the installation component can
Elastic deformation is keeping the liquid volume in the pressure transducer.
A kind of 19. plugs for pressure transducer, the pressure transducer includes housing and sensing element, the housing shape
Into there is manometer tube, the sensing element is arranged in the housing, wherein communication paths are formed with the manometer tube, it is described
Sensing element is connected by the communication paths with external fluid；Characterized in that, the plug is removably engaged in institute
In stating the manometer tube of housing, when there is volumetric expansion into the fluid of the housing by the communication paths contact force is caused
During increase, the plug compensates the volumetric expansion.
20. plugs according to claim 19, it is characterised in that the plug is formed with through hole, the through hole structure
Into at least a portion of the communication paths；Or groove is formed with the periphery of the plug, the groove constitutes described
At least a portion of communication paths.
21. plugs according to claim 20, it is characterised in that the plug to constitute the communication paths
Part can elastic deformation, to change the volume of the communication paths.
22. plugs according to claim 21, it is characterised in that the chamber for being internally formed closing of the plug.
23. plugs according to claim 20, it is characterised in that in the close described sensing element of the plug
End, around the through hole annular protrusion outwardly directed from the plug is formed with.
24. plugs according to claim 22, it is characterised in that in the within the chamber, are formed with along the connector
The multiple flanks for axially and radially extending of part.
25. plugs according to claim 22, it is characterised in that the one of the close described sensing element of the chamber
End is provided with chamber covering.
26. plugs according to claim 25, it is characterised in that the chamber covering is configured to contribute to described
Plug coordinates in the manometer tube of the housing.
27. plugs according to claim 20, it is characterised in that the through hole, groove or groove are longilineal.
28. plugs according to any one of claim 19-27, it is characterised in that form the material of the plug
Thermal conductivity less than formed the sensing element and the manometer tube material average conduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620295518.7U CN206146587U (en) | 2016-04-11 | 2016-04-11 | Pressure sensor and plug member that inserts who is used for pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620295518.7U CN206146587U (en) | 2016-04-11 | 2016-04-11 | Pressure sensor and plug member that inserts who is used for pressure sensor |
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| CN206146587U true CN206146587U (en) | 2017-05-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387322A (en) * | 2017-08-08 | 2019-02-26 | 罗伯特·博世有限公司 | Pressure sensor and method for manufacturing pressure sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387322A (en) * | 2017-08-08 | 2019-02-26 | 罗伯特·博世有限公司 | Pressure sensor and method for manufacturing pressure sensor |
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