CN202549709U - Logic switch - Google Patents
Logic switch Download PDFInfo
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- CN202549709U CN202549709U CN2011205543519U CN201120554351U CN202549709U CN 202549709 U CN202549709 U CN 202549709U CN 2011205543519 U CN2011205543519 U CN 2011205543519U CN 201120554351 U CN201120554351 U CN 201120554351U CN 202549709 U CN202549709 U CN 202549709U
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- lever
- logic switch
- convexity
- cylindrical shaft
- biasing element
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Abstract
The utility model relates to a logic switch. The logic switch comprises a lever, a sensing element, a biasing element, a force balance base and a microswitch, wherein a cylindrical shaft is arranged on the lever and is inserted into a shaft hole in a lever bracket by way of interference fit so that the lever can rotate around the cylindrical shaft; the sensing element is used for sensing fluid characteristic variation and loading the force related to the sensed fluid characteristic variation on the lever; the biasing element is used for loading pretightening force on the lever; the force balance base is used for loading balance force on the lever; and the microswitch is coupled on the lever and is closed or disconnected in response to variations of the forces loaded by the sensing element, the biasing element and the force balance base on the lever. The logic switch has the following beneficial effects: as the lever is inserted into the lever bracket by way of interference fit, the lever can rotate around the cylindrical shaft on the lever seamlessly, thus avoiding the axial float of the lever and further improving the control precision and stability of the logic switch.
Description
Technical field
The utility model relates to the automatic control technology field, more specifically, relates to a kind of logic switch.
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.
The utility model content
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; An aspect according to the utility model; A kind of logic switch is provided, has comprised: lever, it is provided with cylindrical shaft; Said cylindrical shaft inserts in the axis hole on the lever dolly through interference fit, so that said lever can rotate around said cylindrical shaft; Sensing element is used for the induced flow bulk properties and changes, and on said lever, loads the power that is associated with the fluid behaviour variation of being responded to; 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 foregoing description of the utility model; Because lever inserts in the lever dolly through interference fit; Thereby the lever rotation of the cylindrical shaft on it seamlessly; This has just been avoided the axial endplay of lever, thereby has improved the control precision and stability of logic switch.
In one embodiment, said sensing element has first convexity towards said lever, and 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.
In one embodiment, the radius of curvature of said protruding sphere is less than the radius of curvature of said concave spherical surface.
In the above-described embodiments; 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.
In one embodiment, said biasing element comprises interconnective bias spring and spring base, and wherein said spring base has the circular inner hole with said bias spring centrally aligned; Said lever has second convexity towards said circular inner hole, and said second convexity has convex surface with said circular inner hole coupling to be contained at least in part in the said circular inner hole.
In the above-described embodiments; Because second convexity has adopted sphere to be connected with spring base; When bias spring is compressed the rotation of back drive spring base; Second convexity can be rotated in circular inner hole, thereby can avoid spring to be compressed twisting force that the back produces on second convexity and influence the control precision of lever.
The above characteristic of the utility model 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 utility model will be more obvious, and same or analogous label is represented same or analogous parts in the utility model accompanying drawing.
Fig. 1 shows the logic switch 100 according to an embodiment of the utility model;
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 utility model part.Appended accompanying drawing shows the certain embodiments that can realize the utility model through the mode of example.The embodiment of example is not intended to limit all embodiment according to the utility model.Be appreciated that and under the prerequisite of the scope that does not depart from the utility model, can utilize other embodiment, also can carry out the modification of structural or logicality.Therefore, following specific descriptions are also nonrestrictive, and the scope of the utility model is limited appended claim.
In following specific descriptions, with reference to appended accompanying drawing.Accompanying drawing has constituted the part of the utility model, and the mode through example shows the certain embodiments that can implement the utility model in the accompanying drawings.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 the embodiment of the utility model 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 of the scope that does not depart from the utility model, can utilize other embodiment, also can carry out structural or the logicality modification.Therefore, following specific descriptions are also nonrestrictive, and the scope of the utility model is limited appended claim.
Fig. 1 shows the logic switch 100 according to an embodiment of the utility model.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:
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.
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.
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.
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 first protruding 141 of the utility model; 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 utility model, should think that this is illustrated and describes is illustrative and exemplary, rather than restrictive; The utility model is not limited 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 utility model, 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 (7)
1. a logic switch is characterized in that, comprising:
Lever, it is provided with cylindrical shaft, and said cylindrical shaft inserts in the axis hole on the lever dolly through interference fit, so that said lever can rotate around said cylindrical shaft;
Sensing element is used for the variation of induced flow bulk properties, and on said lever, loads the induction force that is associated with the fluid behaviour variation of being responded to;
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 induction force on the said lever closed or break off.
2. logic switch according to claim 1 is characterized in that said fluid behaviour comprises fluid pressure or fluid temperature (F.T.).
3. logic switch according to claim 1 is characterized in that said lever is made up of allumen.
4. logic switch according to claim 1 is characterized in that, said sensing element has first convexity towards said lever, and 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.
5. logic switch according to claim 4 is characterized in that the radius of curvature of said protruding sphere is less than the radius of curvature of said concave spherical surface.
6. logic switch according to claim 1 is characterized in that said biasing element comprises interconnective bias spring and spring base, and wherein said spring base has the circular inner hole with said bias spring centrally aligned; Said lever has second convexity towards said circular inner hole, and said second convexity has convex surface with said circular inner hole coupling to be contained at least in part in the said circular inner hole.
7. logic switch according to claim 6 is characterized in that, the said second protruding convex surface is sphere or hemisphere is planar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205543519U CN202549709U (en) | 2011-12-27 | 2011-12-27 | Logic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205543519U CN202549709U (en) | 2011-12-27 | 2011-12-27 | Logic switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202549709U true CN202549709U (en) | 2012-11-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205543519U Withdrawn - After Issue CN202549709U (en) | 2011-12-27 | 2011-12-27 | Logic switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202549709U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436965A (en) * | 2011-12-27 | 2012-05-02 | 上海瑞勃思能源科技有限公司 | Logical switch |
-
2011
- 2011-12-27 CN CN2011205543519U patent/CN202549709U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436965A (en) * | 2011-12-27 | 2012-05-02 | 上海瑞勃思能源科技有限公司 | Logical switch |
| CN102436965B (en) * | 2011-12-27 | 2014-09-10 | 上海瑞勃思能源科技有限公司 | Logical switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121121 Effective date of abandoning: 20140910 |
|
| RGAV | Abandon patent right to avoid regrant |