CN102436966A - Logical switch used for detecting fluid property - Google Patents

Logical switch used for detecting fluid property Download PDF

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Publication number
CN102436966A
CN102436966A CN2011104453083A CN201110445308A CN102436966A CN 102436966 A CN102436966 A CN 102436966A CN 2011104453083 A CN2011104453083 A CN 2011104453083A CN 201110445308 A CN201110445308 A CN 201110445308A CN 102436966 A CN102436966 A CN 102436966A
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China
Prior art keywords
lever
sensing element
logic switch
force
convexity
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CN2011104453083A
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Chinese (zh)
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CN102436966B (en
Inventor
赵知渊
刘琢
陈卫华
瞿晶晶
王介兰
齐丽华
李晓涛
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SHANGHAI ZHUMIAO TECHNOLOGY CO., LTD.
China Nuclear Power Engineering Co Ltd
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SHANGHAI RUIBOSI ENERGY TECHNOLOGY Co Ltd
China Nuclear Power Engineering Co Ltd
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Priority to CN201110445308.3A priority Critical patent/CN102436966B/en
Publication of CN102436966A publication Critical patent/CN102436966A/en
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Abstract

The invention relates to a logical switch used for detecting fluid property. The logical switch comprises a lever, a sensing element, an offsetting element, a force balance base, and a microswitch, wherein the lever is coupled with a lever support and can rotate to roll the lever; the sensing element is used for sensing fluid characteristic variation, and loads an induction force related to the inductive fluid property variation on the lever; the sensing element is provided with a first bulge facing to the lever, the lever is provided with a groove, the groove is used for containing the first bulge, wherein the groove is provided with a concave spherical surface facing to the first bulge, and the first bulge is provided with a convex spherical surface which is matched with the concave spherical surface; the offsetting element is used for loading pretightening force on the lever, and the force balance base is used for loading balance force on the lever; and the microswitch is coupled with the lever, and is used for closing or disconnecting along the variation of the force loaded on the lever through the sensing element, the offsetting element and the force balance base.

Description

The logic switch that is used for the test fluid characteristic
Technical field
The present invention relates to the automatic control technology field, more specifically, relate to a kind of logic switch that is used for the test fluid characteristic.
Background technology
Logic switch (or being called the pressure logic switch) is a kind of control instrument that is widely used in automation control system.Logic switch is generally used for the pressure or the temperature of fluids such as measurement gas or liquid.When the pressure of detected fluid or temperature were higher or lower than rated value, logic switch can corresponding actions and change the on off operating mode of its sensitive switch that comprises, and then reaches the purpose of automatic control.
Existing logic switch adopts straight top type or the lever-type controller of knife support usually.The straight top type controller architecture is simple, but its parts requirement on machining accuracy is high, and its setting spring power and pressure element be in line, and controller pressure is bigger.For the bigger controlled pressure of balance, need to adopt the big biasing element of rigidity, but torsion and stress that the big biasing element of rigidity produces are bigger, this can influence the performance of controller.Knife support lever controller adopts the lever that is formed by steel plate bending to transmit the pressure or the variations in temperature of institute's sensing, and its shortcoming is that build is big, need to use more bellows, and precision is relatively poor.
Summary of the invention
Based on above-mentioned analysis, it is desirable that a kind of logic switch simple in structure, that precision is high is provided.
In order to address the above problem, according to an aspect of the present invention, a kind of logic switch that is used for the test fluid characteristic is provided, comprising:
Lever is coupled on the lever dolly so that it can rotate around said lever dolly;
Sensing element; Be used for the variation of induced flow bulk properties, and on said lever, load the induction force that is associated with the fluid behaviour variation of being responded to, said sensing element has first convexity towards said lever; Said lever has groove, and said groove is used to hold said first convexity; Wherein, said groove has the concave spherical surface towards said first convexity, and said first convexity has the protruding sphere with said concave spherical surface coupling;
Biasing element is used on said lever, loading pretightning force;
The dynamic balance pedestal is used for load balance power on said lever;
Sensitive switch, it is couple on the said lever, is used in response to said sensing element, said biasing element and said dynamic balance pedestal are carried in the variation of the power on the said lever closed or break off.
Logic switch for the above embodiment of the present invention; Owing to be used for engagement, levers has adopted protruding sphere with first convexity that on lever, loads induction force structure on the sensing element; First convexity than traditional acicular texture; First convexity of this protruding sphere is difficult for because of wearing and tearing with contacting of lever, thereby can reduce the departure of logic switch effectively, and improves the stability of logic switch.
Above characteristic of the present invention and other characteristics are partly set forth embodiment hereinafter clearly.
Description of drawings
Be elaborated to combining the shown embodiment of accompanying drawing through hereinafter, above-mentioned and other characteristics of the present invention will be more obvious, and same or analogous label is represented same or analogous parts in the accompanying drawing of the present invention.
Fig. 1 shows logic switch 100 according to an embodiment of the invention;
Fig. 2 a and Fig. 2 b show the lever of logic switch 100 and being connected of lever dolly of Fig. 1;
Fig. 3 shows the sensing element of the logic switch 100 of Fig. 1;
Fig. 4 shows the sensing element of Fig. 3 and being connected of lever;
Fig. 5 shows the biasing element of logic switch 100 and being connected of lever of Fig. 1;
Fig. 6 shows the stressed sketch map of the logic switch 100 of Fig. 1.
Embodiment
In the specific descriptions of following preferred embodiment, will be with reference to the appended accompanying drawing that constitutes the present invention's part.The mode of appended accompanying drawing through example shows and can realize certain embodiments of the present invention.The embodiment of example is not intended to limit according to all embodiment of the present invention.Be appreciated that and under the prerequisite that does not depart from scope of the present invention, can utilize other embodiment, also can carry out the modification of structural or logicality.Therefore, following specific descriptions are also nonrestrictive, and scope of the present invention is limited appended claim.
In following specific descriptions, with reference to appended accompanying drawing.Accompanying drawing has constituted a part of the present invention, in the accompanying drawings the mode through example show can embodiment of the present invention certain embodiments.In this regard, the term of directivity, for example " left side ", " right side " " top ", " bottom ", " preceding ", " back ", " guiding ", " forward ", " delaying " etc. are used with reference to the direction of describing in the accompanying drawing.Therefore the parts of embodiments of the invention can be placed in multiple different direction, and the term of directivity is to be used for the purpose of example and nonrestrictive.Be appreciated that and under the prerequisite that does not depart from scope of the present invention, can utilize other embodiment, also can carry out structural or the logicality modification.Therefore, following specific descriptions are also nonrestrictive, and scope of the present invention is limited appended claim.
Fig. 1 shows logic switch 100 according to an embodiment of the invention.In practical application, this logic switch 100 is typically connected in the fluid, for example neutral gas such as air and water, refrigerant, wet goods liquid, and be used to measure the characteristic of fluid, the for example temperature of the pressure of fluid or fluid.This logic switch 100 can shift out through lever with measurement result, can not be to avoid traditional contact type measurement at intense radiation environment or inflammable and explosive environment measurement, and the problem that the electronic measurements element can not contact corrosion property fluid.
As shown in Figure 1, this logic switch 100 comprises:
Lever 101, it is provided with cylindrical shaft 102, and this cylindrical shaft 102 inserts in the axis hole 103 on the lever dolly 120 through interference fit, so that lever 101 can rotate around cylindrical shaft 102;
Sensing element 121, it operationally is couple on the lever 101, is used for the induced flow bulk properties and changes, and on lever 101, load the induction force that is associated with the fluid behaviour variation of being responded to;
Biasing element 122, it operationally is couple on said 101, is used on lever 101, loading pretightning force;
Dynamic balance pedestal 123, it operationally is couple on said 101, is used for load balance power on lever 101;
Sensitive switch 105, it operationally is couple on the lever 101, is used in response to sensing element 121, biasing element 122 and dynamic balance pedestal 123 are carried in the variation of the power on the lever 101 closed or break off.
Particularly, logic switch 100 comprises shell 124, and lever dolly 120 promptly is arranged in this shell 124, is usually located at the middle part of its inboard face.Correspondingly, the middle part of lever 101 is connected on this lever dolly 120.The cylindrical shaft 102 that is provided with on the lever 101 has the basic identical or bigger diameter in aperture with the axis hole 103 of lever dolly 120, thereby makes this cylindrical shaft 102 to be inserted in the axis hole 103 with interference fit.When actual installation, can use extrusion process and lubricant to make that lever 101 is comparatively smooth with contacting of lever dolly 120 so that cylindrical shaft 102 is inserted in the axis hole 103.In one embodiment, can adopt pin to fix lever 101.Owing to adopt interference fit to connect lever 101 and lever dolly 120, both can be so that lever 101 can rotate around the cylindrical shaft 102 and the axle center of axis hole 103 flexibly, can guarantee again very close to each other therebetween, to avoid the axial play of lever 101.This can guarantee adjustment screw 104 on the lever 101 with respect to the invariant position of sensitive switch 105, thereby guarantees that logic switch 100 has high control precision and stability.
Be appreciated that in practical application lever 101 also can be connected on the lever dolly 120 through other connected modes, and make it rotate around this lever dolly 120.
Fig. 2 a and 2b show the lever of logic switch 100 and being connected of lever dolly of Fig. 1, and wherein Fig. 2 b is the generalized section of Fig. 2 a.
Shown in Fig. 2 a and 2b, the cylindrical shaft 102 of lever 101 inserts in the axis hole 103 of lever dolly 120 with interference fit, and the cross section of this axis hole 103 is rounded basically, to be suitable for holding the part or all of of cylindrical shaft 102.In the embodiment shown in Figure 2, the two ends of cylindrical shaft 102 are embedded in the axis hole 103.
Still as shown in Figure 1, in one embodiment, dynamic balance pedestal 123 has first one and second one that is positioned at lever dolly 120 both sides, and it is overlapping with the two end portions ground of lever 101 respectively.When the stressed back of lever 101 when the axle center of its axis hole 103 clockwise rotates; First one of first end of lever 101 and dynamic balance pedestal 123 engages, thereby makes this dynamic balance pedestal 123 load balance power on lever 101 continue to clockwise rotate to stop lever 101; Similarly, when the stressed back of lever 101 when the axle center of its axis hole 103 rotates counterclockwise, second one of second end of lever 101 and dynamic balance pedestal 123 engages, thereby makes this dynamic balance pedestal 123 load balance power on lever 101.This dynamic balance pedestal 123 is used for balance sensing element 121, biasing element 122 is carried in the power on the lever 101.
Adjustment screw 104 is arranged on the side of lever 101 towards sensitive switch 105, and it operationally engages sensitive switch 105.When lever 101 clockwise rotated and engages sensitive switch 105, this sensitive switch 105 received the power that lever 101 applies via adjustment screw 104.When this power surpassed predetermined threshold, the state variation of sensitive switch 105 for example converted open mode into by closure state, perhaps converts closure state into by open mode.When lever 101 rotated counterclockwise and leaves sensitive switch 105, this sensitive switch 105 no longer received the power that lever 101 applies via adjustment screw 104, and perhaps applied force is less than predetermined threshold, and the state of sensitive switch 105 is respective change also.
In one embodiment, lever 101 and shell 124 adopt allumen to constitute, and for example the casting of ZAMAK aluminium forms.Allumen is lightly firm, and wear-resisting resistance to compression.With respect to the lever that adopted steel plate bending to form usually in the past, the lever 101 that this employing allumen casting forms can be avoided the gap occurring between lever 101 and the shell 124, thereby has further improved control precision.
Sensitive switch 105 is installed in the shell 124, and it is connected on the controlled device through binding post 107, with the work of control controlled device.Cable to sensitive switch 105 power supplies can be connected in the shell 124 through the lead collar on the shell 124 106.Biasing element 122 comprises two bias springs 108 and 111, and wherein, bias spring 108 is connected on the lever 101 through spring base 112, and is connected on the shell 124 through spring base 109, wherein, has circular inner hole 113 in the spring base 112; And bias spring 111 is connected on the lever 101 through spring base 114, and is connected on the shell 124 through spring base 110, wherein has circular inner hole 115 in the spring base 114.In practical application, bias spring 108 and 111 is set to be basically perpendicular to lever 101, so that the pretightning force that it loaded also is basically perpendicular to lever 101, thus the precision of raising logic switch.
Sensing element 121 is used to respond to the characteristic of fluids such as fluid pressure, fluid temperature (F.T.), and on lever 101, loads the induction force that is associated with the fluid behaviour variation of being responded to.In practical application,, can use different sensor to be used as sensing element 121 according to different application requirements or demand for control.
Fig. 3 shows the sensing element of the logic switch 100 of Fig. 1.
As shown in Figure 3, dish 133 and bellows welding, pipe 132 and joint 135 and bellows welding.Pipe 132 is fixed on the housing 131 to limit the motion of bellows 134 with housing 131 welding, screw element 136.O type circle 137 is with the miscellaneous part of sensing element and logic switch, and for example the shell 124 of Fig. 1 connects hermetically.Come directly towards 138 positions that are used to regulate the transmission of power between sensing element and the lever.
Fig. 4 shows the sensing element of Fig. 3 and being connected of lever.
As shown in Figure 4, sensing element has towards first protruding 141 of lever 101.This first convexity 141 specifically is positioned at the end of top 138.Lever 101 has groove 142, and this groove 142 is used to hold first protruding 141.Wherein, groove 142 has the concave spherical surface 143 towards first convexity 141, and first convexity 141 has the protruding sphere 144 that matees with this concave spherical surface 143.First convexity than traditional acicular texture; For of the present invention first protruding 141; When moving and during engagement lever 101 towards lever after the pressure of sense element senses fluid or the variations in temperature; Have bigger contact area between first protruding 141 and the lever 101 of protruding sphere, thereby the pressure that contact-making surface is received is less.Therefore, first protruding 141 is difficult for because of wearing and tearing with contacting of lever 101, thereby can reduce the departure of logic switch effectively, and improves the stability of logic switch.
Still as shown in Figure 1, biasing element 122 is used on lever 101, loading pretightning force.In certain embodiments, can adopt spring to be used as biasing element 122, and the reduction length through spring change the size of controlling the pretightning force that biasing element 122 loaded.On shell 124 and the lever 101 spring base is set respectively, thereby makes an end of spring to be connected to through the spring base on the shell 124 on the shell 124, the other end of spring then is connected on the lever 101 through the spring base on the lever 101.In traditional logic switch, spring base all is that the plane is connected with the plane with lever, because can rotation after the spring stress compression, this can apply torsion on lever, and for the higher spring of rigidity, this torsion is bigger.The torsion that is carried on the lever can influence the stressed distribution of lever, thereby reduces the control precision of logic switch.
Fig. 5 shows the biasing element of logic switch 100 and being connected of lever of Fig. 1.
As shown in Figure 5, biasing element comprises interconnective bias spring 151 and spring base 152, and wherein this spring base 152 has the circular inner hole 153 with bias spring 151 centrally aligneds; Lever 101 has second convexity 154 towards this circular inner hole 153, and this second convexity 154 has the convex surface with circular inner hole 153 couplings, thereby makes it to be contained at least in part in the circular inner hole 153.In certain embodiments, second protruding 154 convex surface is sphere or hemisphere is planar, perhaps is taper seat.Adopted sphere to be connected owing to second protruding 154 with spring base 152; When bias spring 151 is compressed 152 rotations of back drive spring base; Second protruding 154 can rotate in circular inner hole 153, thereby can avoid bias spring 151 to be compressed twisting force that the back produces on second convexity 154 and influence the control precision of lever 101.Need to prove that in practical application, biasing element can comprise one or more bias springs and corresponding spring seat, be carried in the pretightning force on the lever 101 to control biasing element respectively.
Fig. 6 shows the stressed sketch map of the logic switch 100 of Fig. 1.Next, in conjunction with Fig. 6 the operation principle of logic switch 100 is described.
As shown in Figure 6, this logic switch comprises lever 161, sensing element 162, biasing element 163, dynamic balance pedestal 164 and sensitive switch 165.Wherein, lever 161 comprises balance pivot 166, and rotate around this balance pivot 166 its stressed back.And biasing element 163 comprises that two adjustable bias spring 163a and 163b load pretightning force.
Be in operation, controlled fluid pressure F is delivered on the right arm of lever 161 through sensing element 162.When sensitive switch 165 did not trigger, the moment that fluid pressure produces surpassed the pretightning force F of biasing element 163 1, F 2And the directed force F of sensitive switch 165 OfAct on the resultant moment on the lever 161, sensitive switch 165 is realized the following switching of state.When sensitive switch 165 triggered, the moment that fluid pressure produces was less than the pretightning force F of biasing element 163 1, F 2And the directed force F of sensitive switch 165 OfAct on the resultant moment on the lever 161, then sensitive switch 165 is realized the switching of going up of state.Be appreciated that through using different oligodynamic switch 165 and biasing element 163, can switch and the following scope of switching on the control logic switch 100, repeat no more at this.
Though the foregoing description has been described the present invention, should think that this is illustrated and describes is illustrative and exemplary, rather than restrictive; The invention is not restricted to above-mentioned execution mode.
The those skilled in the art in those present technique fields can be through research specification, disclosed content and accompanying drawing and appending claims, and understanding and enforcement are to other changes of the execution mode of disclosure.In claim, word " comprises " element and the step of not getting rid of other, and wording " one " is not got rid of plural number.In the practical application of invention, the function of a plurality of technical characterictics of being quoted during a part possibility enforcement of rights requires.Any Reference numeral in the claim should not be construed as the restriction to scope.

Claims (4)

1. a logic switch that is used for the test fluid characteristic is characterized in that, comprising:
Lever is coupled on the lever dolly so that it can rotate around said lever dolly;
Sensing element; Be used for the variation of induced flow bulk properties, and on said lever, load the induction force that is associated with the fluid behaviour variation of being responded to, said sensing element has first convexity towards said lever; Said lever has groove, and said groove is used to hold said first convexity; Wherein, said groove has the concave spherical surface towards said first convexity, and said first convexity has the protruding sphere with said concave spherical surface coupling;
Biasing element is used on said lever, loading pretightning force;
The dynamic balance pedestal is used for load balance power on said lever;
Sensitive switch, it is couple on the said lever, is used in response to said sensing element, said biasing element and said dynamic balance pedestal are carried in the variation of the power on the said lever closed or break off.
2. logic switch according to claim 1 is characterized in that the radius of curvature of said protruding sphere is less than the radius of curvature of said concave spherical surface.
3. logic switch according to claim 1 is characterized in that said fluid behaviour comprises fluid pressure or fluid temperature (F.T.).
4. logic switch according to claim 1 is characterized in that said lever is made up of allumen.
CN201110445308.3A 2011-12-27 2011-12-27 Logical switch used for detecting fluid property Active CN102436966B (en)

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Application Number Priority Date Filing Date Title
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CN102436966B CN102436966B (en) 2014-10-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2923626Y (en) * 2006-05-18 2007-07-18 杭州富沃德电子电器有限公司 Mechanism for detecting track state
CN201252049Y (en) * 2008-09-09 2009-06-03 胡大舟 Totally enclosed adjustable flow switch
CN201898085U (en) * 2010-04-13 2011-07-13 上海奉申制冷控制器有限公司 Target sheet type flow switch
CN202549710U (en) * 2011-12-27 2012-11-21 上海瑞勃思能源科技有限公司 Logic switch for detecting fluid characteristics

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2923626Y (en) * 2006-05-18 2007-07-18 杭州富沃德电子电器有限公司 Mechanism for detecting track state
CN201252049Y (en) * 2008-09-09 2009-06-03 胡大舟 Totally enclosed adjustable flow switch
CN201898085U (en) * 2010-04-13 2011-07-13 上海奉申制冷控制器有限公司 Target sheet type flow switch
CN202549710U (en) * 2011-12-27 2012-11-21 上海瑞勃思能源科技有限公司 Logic switch for detecting fluid characteristics

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Effective date of registration: 20170629

Address after: 201203, 5, Lane 572, Lane 115, blue wave road, Zhangjiang hi tech park, Shanghai, Pudong New Area

Co-patentee after: China Nuclear Power Engineering Co., Ltd.

Patentee after: SHANGHAI ZHUMIAO TECHNOLOGY CO., LTD.

Address before: 200135 room 1403, information building, No. 503 Minsheng Road, Shanghai, Pudong New Area

Co-patentee before: China Nuclear Power Engineering Co., Ltd.

Patentee before: Shanghai Ruibosi Energy Technology Co., Ltd.

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