CN102543567B - Lever-type logic switch - Google Patents
Lever-type logic switch Download PDFInfo
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- CN102543567B CN102543567B CN201110445898.XA CN201110445898A CN102543567B CN 102543567 B CN102543567 B CN 102543567B CN 201110445898 A CN201110445898 A CN 201110445898A CN 102543567 B CN102543567 B CN 102543567B
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- logic switch
- dynamic balance
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Abstract
The invention relates to a lever-type logic switch, which comprises a lever, a sensing element, an offset element, a force balance base and a micro-switch, wherein the lever is coupled to a lever bracket so as to be enabled to rotate around the lever bracket; the sensing element is used for sensing fluid characteristic change and loading a sensing force relevant to the sensed fluid characteristic change on the lever; the offset element is used for loading a pre-tightening force on the lever; the force balance base is used for loading a balance force on the lever; the micro-switch is coupled to the lever and is closed or switched off by responding to change of force loaded on the lever by the sensing element, the offset element and the force balance base; wherein the offset element comprises an offset spring and a spring base which are connected mutually, wherein the spring base is provided with a circular internal hole which is aligned to the center of the offset spring; the lever is provided with a second protuberance toward the circular internal hole; and the second protuberance is provided with a convexity matching the circular internal hole so as to be contained in the circular internal hole at least in part.
Description
Technical field
The present invention relates to automatic control technology field, more specifically, relate to a kind of lever-type logic switch.
Background technology
Logic switch (or being called pressure logic switch) is a kind of control instrument being widely used in automation control system.Logic switch is generally used for pressure or the temperature of the fluid such as measurement gas or liquid.When the pressure of detected fluid or temperature are higher or lower than rated value, logic switch can corresponding actions and change the on off operating mode of the sensitive switch that it comprises, and then reaches the object automatically controlled.
Existing logic switch adopts straight top type or the lever-type controller of knife support usually.Straight top type controller architecture is simple, but its parts machining required precision is high, and its setting spring power and pressure element are in line, and controller pressure is larger.In order to balance larger controlled pressure, need to adopt the large biasing element of rigidity, but the torsion that produces of the large biasing element of rigidity and stress comparatively large, this can affect the performance of controller.Knife support lever controller adopts and transmits sensed pressure or variations in temperature by the lever of steel plate bending, and its shortcoming is that build is large, need to use more bellows, and precision is poor.
Summary of the invention
Based on above-mentioned analysis, the lever-type logic switch that a kind of structure is simple, precision is high is provided to be desirable.
In order to solve the problem, according to an aspect of the present invention, provide a kind of lever-type logic switch, comprising:
Lever, is coupled on lever dolly to make it can rotate around described lever dolly;
Sensing element, for the change of induced flow bulk properties, and loads the induction force being associated with responded to fluid behaviour change on described lever;
Biasing element, for loading pretightning force on described lever;
Dynamic balance pedestal, for load balance power on described lever;
Sensitive switch, it is couple on described lever, closes for being carried in the change of the power on described lever in response to described sensing element, described biasing element and described dynamic balance pedestal or disconnecting;
Wherein, described biasing element comprises interconnective bias spring and spring base, and wherein said spring base has the circular inner hole aimed at described bias spring center; Described lever has towards second of described circular inner hole protruding, and described second projection has the convex surface that mates with described circular inner hole to be at least partly accommodated in described circular inner hole.
In the above-described embodiments, the second projection is connected owing to have employed sphere with spring base, when bias spring is compressed the rotation of rear band flexible spring seat, second projection can be rotated in circular inner hole, thus spring can be avoided in the second projection, to be affected the control precision of lever by the twisting force compressing rear generation.This makes the precision of logic switch be improved.
Embodiment part is hereinafter set forth by above characteristic of the present invention and other characteristics clearly.
Accompanying drawing explanation
By being hereafter described in detail to embodiment shown by reference to the accompanying drawings, above-mentioned and other features of the present invention will be more obvious, and in accompanying drawing of the present invention, same or analogous label represents same or analogous parts.
Fig. 1 shows logic switch 100 according to an embodiment of the invention;
Fig. 2 a and Fig. 2 b shows the lever of logic switch 100 and the connection 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 the connection of lever;
Fig. 5 shows the biasing element of logic switch 100 and the connection of lever of Fig. 1;
Fig. 6 shows the stressed schematic diagram of the logic switch 100 of Fig. 1.
Embodiment
In the specific descriptions of following preferred embodiment, with reference to the accompanying drawing formed appended by a part of the present invention.Appended accompanying drawing shows by way of example and can realize specific embodiment of the present invention.The embodiment of example is not intended to limit according to all embodiments of the present invention.Be appreciated that under the prerequisite not departing from scope of the present invention, other embodiments can be utilized, also can carry out amendment that is structural or logicality.Therefore, following specific descriptions are also nonrestrictive, and scope of the present invention limited by appended claim.
In following specific descriptions, with reference to appended accompanying drawing.Figures constitute a part of the present invention, show by way of example in the accompanying drawings and can implement specific embodiment of the present invention.In this regard, the term of directivity, such as "left", "right" " top ", " bottom ", "front", "rear", " guiding ", " forward ", " delaying " etc., use with reference to the direction described in accompanying drawing.Therefore the parts of embodiments of the invention can be placed in multiple different direction, and the term of directivity is nonrestrictive for the object of example.Be appreciated that under the prerequisite not departing from scope of the present invention, other embodiments can be utilized, also can carry out structural or logicality amendment.Therefore, following specific descriptions are also nonrestrictive, and scope of the present invention limited by appended claim.
Fig. 1 shows logic switch 100 according to an embodiment of the invention.In actual applications, this logic switch 100 is typically connected in fluid, neutral gas and water, refrigerant, the wet goods liquid such as such as air, and for measuring the characteristic of fluid, the pressure of such as fluid or the temperature of fluid.Measurement result can be shifted out by lever by this logic switch 100, can not at strong radiation environment or inflammable and explosive environment measurement to avoid conventional contact to measure, and electronic measurements element can not the problem of contact corrosion fluid.
As shown in Figure 1, this logic switch 100 comprises:
Lever 101, is provided with cylindrical shaft 102, and this cylindrical shaft 102 is inserted in the axis hole 103 on lever dolly 120 by interference fit, can rotate to make lever 101 around cylindrical shaft 102;
Sensing element 121, it is operationally couple on described lever 101, for the change of induced flow bulk properties, and on lever 101, loads the induction force being associated with responded to fluid behaviour change;
Biasing element 122, it is operationally couple on described lever 101, for loading pretightning force on lever 101;
Dynamic balance pedestal 123, it is operationally couple on described lever 101, for load balance power on lever 101;
Sensitive switch 105, it is couple on lever 101, closes for being carried in the change of the power on lever 101 in response to sensing element 121, biasing element 122 and dynamic balance pedestal 123 or disconnecting.
Particularly, logic switch 100 comprises shell 124, and namely lever dolly 120 is arranged in this shell 124, is usually located at the middle part in a face inside it.Correspondingly, the middle part of lever 101 is connected on this lever dolly 120.The cylindrical shaft 102 that lever 101 is arranged has the diameter substantially identical or bigger with the aperture of the axis hole 103 of lever dolly 120, thus this cylindrical shaft 102 can be inserted in axis hole 103 with interference fit.When actual installation, what extrusion process and lubricant can be used to make lever 101 and lever dolly 120 contacts comparatively smooth so that inserted in axis hole 103 by cylindrical shaft 102.In one embodiment, pin can be adopted to fix lever 101.Owing to adopting interference fit to connect lever 101 and lever dolly 120, lever 101 both can be made around the axle center flexible rotating of cylindrical shaft 102 with axis hole 103, can to ensure again very close to each other therebetween, to avoid the play of lever 101 axis.This can ensure the invariant position of the adjustment screw 104 on lever 101 relative to sensitive switch 105, thus ensures that logic switch 100 has higher control precision and stability.
Be appreciated that in actual applications, lever 101 also can be connected on lever dolly 120 by other connected modes, and it is rotated around this lever dolly 120.
Fig. 2 a and 2b shows the lever of logic switch 100 and the connection of lever dolly of Fig. 1, and wherein Fig. 2 b is the generalized section of Fig. 2 a.
As illustrated in figures 2a 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 substantially rounded, 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 axis hole 103.
Still as shown in Figure 1, in one embodiment, dynamic balance pedestal 123 has first and second being positioned at lever dolly 120 both sides, and it is overlapping with the two end portions ground of lever 101 respectively.When rotating clockwise around the axle center of its axis hole 103 after lever 101 is stressed, the first end of lever 101 engages with first of dynamic balance pedestal 123, thus makes this dynamic balance pedestal 123 continue to rotate clockwise to load balance power on lever 101 to stop lever 101; Similarly, when rotating counterclockwise around the axle center of its axis hole 103 after lever 101 is stressed, the second end of lever 101 engages with second of dynamic balance pedestal 123, thus makes this dynamic balance pedestal 123 to load balance power on lever 101.This dynamic balance pedestal 123 for balancing sensing element 121, biasing element 122 is carried in power on 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 rotates clockwise and engages sensitive switch 105, this sensitive switch 105 is subject to the power that lever 101 applies via adjustment screw 104.When this power exceedes predetermined threshold, the state variation of sensitive switch 105, such as, be converted to open mode by closure state, or be converted to closure state by open mode.When lever 101 rotates counterclockwise and leaves sensitive switch 105, this sensitive switch 105 is no longer subject to the power that lever 101 applies via adjustment screw 104, or applied force is less than predetermined threshold, the state also respective change of sensitive switch 105.
In one embodiment, lever 101 and shell 124 adopt allumen to form, and such as the casting of ZAMAK aluminium forms.Allumen is lightly firm, and wear-resistant pressure-resistant.Relative to the lever usually adopting steel plate bending in the past, the lever 101 of this employing allumen casting can be avoided occurring gap between lever 101 and shell 124, thus further increases control precision.
Sensitive switch 105 is installed in shell 124, and it is connected on controlled device by binding post 107, to control the work of controlled device.The cable of powering to sensitive switch 105 can be connected in shell 124 by the lead collar 106 on shell 124.Biasing element 122 comprises two bias springs 108 and 111, and wherein, bias spring 108 is connected on lever 101 by spring base 112, and is connected on shell 124 by spring base 109, wherein, has circular inner hole 113 in spring base 112; And bias spring 111 is connected on lever 101 by spring base 114, and be connected on shell 124 by spring base 110, wherein in spring base 114, there is circular inner hole 115.In actual applications, bias spring 108 and 111 is set to be basically perpendicular to lever 101, and the pretightning force loaded to make it is also basically perpendicular to lever 101, thus improves the precision of logic switch.
Sensing element 121 for responding to the characteristic of the fluid such as fluid pressure, fluid temperature (F.T.), and loads the induction force being associated with responded to fluid behaviour change on lever 101.In actual applications, according to different application demands or demand for control, different transducers can be used to be used as sensing element 121.
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 welds with housing 131, and screw element 136 is fixed on housing 131 to limit the motion of bellows 134.O type circle 137 is by the miscellaneous part of sensing element and logic switch, and the shell 124 of such as Fig. 1 connects hermetically.Come directly towards 138 for regulating the position of the transmission of power between sensing element and lever.
Fig. 4 shows the sensing element of Fig. 3 and the connection of lever.
As shown in Figure 4, sensing element has towards the first projection 141 of lever 101.This first projection 141 is specifically positioned at the end of top 138.Lever 101 has groove 142, and this groove 142 is for holding the first projection 141.Wherein, groove 142 has the concave spherical surface 143 towards the first projection 141, and the first projection 141 has the convex spherical 144 mated with this concave spherical surface 143.Protruding compared to first of traditional acicular texture, for the first projection 141 of the present invention, when after the pressure or variations in temperature of sense element senses fluid towards lever move and engagement lever 101 time, have larger contact area between first protruding 141 of convex spherical and lever 101, thus the pressure that receives of contact-making surface is less.Therefore, the first projection 141 is is not easily worn and torn because of the contact with lever 101, thus effectively can reduce the departure of logic switch, and improves the stability of logic switch.
Still as shown in Figure 1, biasing element 122 for loading pretightning force on lever 101.In certain embodiments, spring can be adopted to be used as biasing element 122, and control the size of the pretightning force that biasing element 122 loads by the reduction length change of spring.Shell 124 and lever 101 arrange a spring base respectively, thus makes one end of spring to be connected to by the spring base on shell 124 on shell 124, the other end of spring is then connected on lever 101 by the spring base on lever 101.In traditional logic switch, spring base and lever are all that plane is connected with plane, and owing to can rotate after spring stress compression, this can apply torsion on lever, and for the spring that rigidity is higher, this torsion is larger.The torsion be carried on lever can affect the distribution of force of lever, thus reduces the control precision of logic switch.
Fig. 5 shows the biasing element of logic switch 100 and the connection 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 aimed at bias spring 151 center; Lever 101 has the second projection 154 towards this circular inner hole 153, and this second projection 154 has the convex surface mated with circular inner hole 153, thus it can be at least partly accommodated in circular inner hole 153.In certain embodiments, the convex surface of the second projection 154 spherically or hemisphere planar, or in taper seat.The second projection 154 is connected owing to have employed sphere with spring base 152, when bias spring 151 compressed rear band flexible spring seat 152 rotate time, second projection 154 can be rotated in circular inner hole 153, thus bias spring 151 can be avoided in the second projection 154, to be affected the control precision of lever 101 by the twisting force compressing rear generation.It should be noted that, in actual applications, biasing element can comprise the spring base of one or more bias spring and correspondence, is carried in pretightning force on lever 101 to control biasing element respectively.
Fig. 6 shows the stressed schematic diagram of the logic switch 100 of Fig. 1.Next, the operation principle of composition graphs 6 pairs of logic switches 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, rotates after it is stressed around this balance pivot 166.Further, biasing element 163 comprises two adjustable bias spring 163a and 163b to load pretightning force.
Be in operation, controlled fluid pressure F is delivered on the right arm of lever 161 by sensing element 162.When sensitive switch 165 does not trigger, the moment that fluid pressure produces exceedes 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 lever 161, sensitive switch 165 realizes the lower switching of state.When sensitive switch 165 triggers, the moment that fluid pressure produces is 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 lever 161, then sensitive switch 165 realizes the upper switching of state.Being appreciated that by using different sensitive switches 165 and biasing element 163, control logic switch 100 can switching and the scope of lower switching, not repeating them here.
Although above embodiment described the present invention, it is illustrative and exemplary for should thinking that this is illustrated and describes, instead of restrictive; The invention is not restricted to above-mentioned execution mode.
The those skilled in the art of those the art can pass through research specification, disclosed content and accompanying drawing and appending claims, understand and implement other changes to the execution mode disclosed.In the claims, word " comprises " element and step of not getting rid of other, and wording " one " does not get rid of plural number.In the practical application of invention, the function of the multiple technical characteristics quoted during a part possibility enforcement of rights requires.Any Reference numeral in claim should not be construed as the restriction to scope.
Claims (4)
1. a lever-type logic switch, is characterized in that, comprising:
Lever, is coupled on lever dolly to make it can rotate around described lever dolly;
Sensing element, for the change of induced flow bulk properties, and loads the induction force being associated with responded to fluid behaviour change on described lever;
Biasing element, for loading pretightning force on described lever;
Dynamic balance pedestal, for load balance power on described lever;
Sensitive switch, it is couple on described lever, closes for being carried in the change of the power on described lever in response to described sensing element, described biasing element and described dynamic balance pedestal or disconnecting;
Wherein, described biasing element comprises interconnective bias spring and spring base, and wherein said spring base has the circular inner hole aimed at described bias spring center; Described lever has towards second of described circular inner hole protruding, and described second projection has the convex surface that mates with described circular inner hole to be at least partly accommodated in described circular inner hole;
Wherein, described dynamic balance pedestal has first and second being positioned at described lever dolly both sides, it is overlapping with the two end portions ground of described lever respectively, when the axle center around its axis hole after described lever stress rotates clockwise, the first end of described lever engages with first of described dynamic balance pedestal, thus make described dynamic balance pedestal continue to rotate clockwise to load balance power on described lever to stop described lever, when the axle center around its axis hole after described lever stress rotates counterclockwise, second end of described lever engages with second of described dynamic balance pedestal, thus make described dynamic balance pedestal to load balance power on described lever.
2. lever-type logic switch according to claim 1, is characterized in that, the convex surface of described second projection spherically or hemisphere planar.
3. lever-type logic switch according to claim 1, is characterized in that, described fluid behaviour comprises fluid pressure or fluid temperature (F.T.).
4. lever-type logic switch according to claim 1, is characterized in that, described lever is made up of allumen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110445898.XA CN102543567B (en) | 2011-12-27 | 2011-12-27 | Lever-type logic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110445898.XA CN102543567B (en) | 2011-12-27 | 2011-12-27 | Lever-type logic switch |
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| Publication Number | Publication Date |
|---|---|
| CN102543567A CN102543567A (en) | 2012-07-04 |
| CN102543567B true CN102543567B (en) | 2015-06-10 |
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| CN201110445898.XA Active CN102543567B (en) | 2011-12-27 | 2011-12-27 | Lever-type logic switch |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1257410B (en) * | 1992-03-18 | 1996-01-15 | Valter Falavegna | CONTROL FLOW SWITCH PARTICULARLY FOR PRIMARY CIRCUITS IN HEATING SYSTEMS |
| CN2138338Y (en) * | 1992-08-23 | 1993-07-14 | 马连泰 | Pressure relay |
| CN201844068U (en) * | 2010-02-09 | 2011-05-25 | 陕西秦峰液压有限责任公司 | High-pressure hydraulic one-way valve |
| CN202454493U (en) * | 2011-12-27 | 2012-09-26 | 上海瑞勃思能源科技有限公司 | Lever-type logic switch |
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| CN102543567A (en) | 2012-07-04 |
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Effective date of registration: 20170622 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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