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CN103390526A - Logic switch and lever thereof - Google Patents

Logic switch and lever thereof Download PDF

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Publication number
CN103390526A
CN103390526A CN2013103177352A CN201310317735A CN103390526A CN 103390526 A CN103390526 A CN 103390526A CN 2013103177352 A CN2013103177352 A CN 2013103177352A CN 201310317735 A CN201310317735 A CN 201310317735A CN 103390526 A CN103390526 A CN 103390526A
Authority
CN
China
Prior art keywords
lever
bearing pin
logic switch
hole
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2013103177352A
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Chinese (zh)
Inventor
赵知渊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HENGFENG SAITE INDUSTRIAL (SHANGHAI) Co Ltd
Original Assignee
HENGFENG SAITE INDUSTRIAL (SHANGHAI) Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HENGFENG SAITE INDUSTRIAL (SHANGHAI) Co Ltd filed Critical HENGFENG SAITE INDUSTRIAL (SHANGHAI) Co Ltd
Priority to CN2013103177352A priority Critical patent/CN103390526A/en
Publication of CN103390526A publication Critical patent/CN103390526A/en
Pending legal-status Critical Current

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  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Abstract

The invention discloses a logic switch and a lever thereof. The logic switch comprises a casing, the lever rotationally connected to a pin shaft, an inductive element used for sensing characteristic variation of fluid outside the casing and loading induction torque relevant to the sensed characteristic variation of the fluid on a first part on one side of the pin shaft, an offset element used for loading pretension torque opposite to the induction torque on the first part of the lever, and a microswitch which is turned on or off by responding the variation of torque on the lever loaded on the inductive element and the offset element, wherein the lever further comprises a middle part positioned between the first part and a second part, and the middle part is provided with at least two through holes which are formed at an interval, have the centers aligned and are basically the same as the pin shaft in size to allow the pin shaft to penetrate therein. Compared with the lever of a logic switch in the prior art, the lever provided by the invention has the advantage that the condition that a long hole is processed is changed in the condition that two short holes are processed, so that processing can be easier, and the tolerance requirements on shaft-hole matching can be ensured more easily.

Description

A kind of logic switch with and lever
Technical field
The present invention relates to a kind of logic switch with and lever.
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 pressure or the temperature of the fluids such as measurement gas or liquid.In the pressure of detected fluid or temperature during 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 generally all is furnished with lever in housing, this lever is generally formed through die casting by aluminium alloy.This lever also be provided with in rough central position the lengthwise through hole that runs through its whole width be fixed on housing on bearing pin coordinate rotationally.
Yet, the practice discovery, so long through hole is to be difficult to very much process and guarantee its precision.Namely allow to process, to reaming bit, reaming number of times even workman's technical ability require all very high.This is very disadvantageous for cost control undoubtedly.
Summary of the invention
Provide a kind of processing request to realize simultaneously that easily high-precision logic switch is desirable.
Therefore, according to an aspect of the present invention, disclose a kind of logic switch, it comprises: housing, be furnished with support and the dynamic balance pedestal that is positioned at described support both sides in it, and wherein, be provided with bearing pin on described support; Lever, be pivotally connected on described bearing pin so that described lever two ends respectively near described dynamic balance pedestal in described housing, wherein said lever comprises in the first of described bearing pin one side, at second portion and the mid portion between described first and second portion of described bearing pin opposite side, described mid portion have that at least two isolated, center is aimed at and the basic through hole consistent with described bearing pin of size so that described bearing pin be arranged in wherein; Sensing element, be used for responding to the variation of the outer fluid behaviour of described housing, and load the induction force distance that is associated with the fluid behaviour variation of responding in the first of described lever; Biasing element, it is arranged in described housing and is used for loading the pre-fastening moment opposite with described induced moment in the first of described lever; And sensitive switch, the second portion of its relatively described lever is arranged in described housing, is used in response to described sensing element and described biasing element are carried in the variation of the moment on described lever closed or disconnect.
Particularly, described mid portion comprise the base portion of approximate horizontal and the first side wall section of from described base portion, extending perpendicular to the direction of described bearing pin and with isolated the second side wall portion of the first side wall section, has the first through hole in described the first side wall section, have the second through hole on described the second side wall portion, described the second through hole is aimed at described the first through hole center and its diameter all is configured to be suitable for holding the size of described bearing pin.
More specifically, described mid portion becomes U-shaped substantially.
Preferably, described lever is that the stainless steel material machine work forms.
According to another aspect of the present invention, a kind of lever of logic switch is disclosed, described lever has the part that the bearing pin for use as fulcrum passes, its be limited with that at least two isolated, center is aimed at and the basic through hole consistent with described bearing pin of size so that described bearing pin be arranged in wherein.
Preferably, described lever is that the stainless steel material machine work forms.
Have following advantage in the present invention:
The mid portion of the lever of logic switch of the present invention defines two through holes so that bearing pin passes this two through holes.Only define a very long through hole with the mid portion of the lever of the logic switch of prior art and compare, owing to from the processing slotted hole, having become and only having processed two short holes, therefore, be more prone to process and more easily guarantee the tolerance of shaft-hole match.This is very important for the very high logic switch of required precision.And logic switch disclosed by the invention processes by numerical control machining center, need to be by the drilling machine reaming than the through hole of the lever of the logic switch of prior art, and precision is higher, thereby can reduce friction, and improves the accuracy of switch.
In addition, lever-pin shaft structure disclosed by the invention can make bearing pin expose from centre, and therefore, the contact-making surface between lever and bearing pin reduces, and frictional force also reduces thereupon, and precision is improved.
On the other hand, the material of the lever of logic switch of the present invention is stainless steel, and its life-span is increased greatly.
Moreover the lever that the aluminium of prior art is made needs die casting to form, and, needs die sinking that is; And the lever that the stainless steel of logic switch of the present invention is made does not need die sinking, has saved the die sinking expense from reducing costs.
Description of drawings
In order to explain the present invention, its illustrative embodiments will be described with reference to the drawings hereinafter, in accompanying drawing:
Fig. 1 shows the perspective view of a kind of logic switch of the present invention;
Fig. 2 shows the perspective view of a kind of logic switch of the present invention, wherein, has removed biasing element and sensitive switch etc.; And
Fig. 3 shows the lever of a kind of logic switch of the present invention.
Similar features in different figure is by similar Reference numeral indication.
Embodiment
In the detailed description of following execution mode, the accompanying drawing that reference forms the part of this description describes.Accompanying drawing shows specific execution mode in the mode of example, and the present invention is implemented in these execution modes.Shown execution mode is not according to all of the embodiments of the present invention for limit.The execution mode that is appreciated that other can be utilized, and change structural or logicality can be made under the prerequisite that does not depart from the scope of the present invention.For accompanying drawing, the term of directivity, such as D score, " on " etc., with reference to the orientation of described accompanying drawing using.Because the assembly of embodiments of the present invention can be implemented with multiple orientation, these directional terminology are the purposes for explanation, rather than the purpose of restriction.Therefore, following embodiment is not the meaning as restriction, and scope of the present invention is limited by appending claims.
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, such as the neutral gas such as air and water, refrigerant, wet goods liquid, and is used for measuring the characteristic of fluid, for example the temperature of the pressure of fluid or fluid.This logic switch 100 can be shifted out measurement result by lever, can not be at intense radiation environment or inflammable and explosive environment measurement to avoid traditional contact type measurement, and the problem that the electronic measurements element can not the contact corrosion fluid.
As shown in Figure 1-Figure 3, this logic switch 100 comprises:
Housing 102, be furnished with support 104 and the dynamic balance pedestal 106 that is positioned at described support 104 both sides in it, wherein, be provided with bearing pin 108 on described support 104;
Lever 110, be pivotally connected on described bearing pin 108 so that described lever 110 two ends respectively near described dynamic balance pedestal 106 in described housing 102;
Sensing element 112, be used for responding to the variation of the outer fluid behaviour of described housing 102, and load the induction force distance that is associated with the fluid behaviour variation of responding on the 110a of first of described bearing pin 108 1 sides of being positioned at of described lever 110;
Biasing element 114, it is arranged in described housing 102 and is used for loading the pre-fastening moment opposite with described induced moment on the 110a of first of described lever 110; And
Sensitive switch 116, the second portion 110b that is positioned at described bearing pin 108 opposite sides of its relatively described lever 110 is arranged in described housing 102, is used in response to described sensing element 112 and described biasing element 114 are carried in the variation of the moment on described lever 110 closed or disconnect;
As shown in Figure 3, described lever 110 also comprises the mid portion 110c between the described 110a of first and second portion 110b, described mid portion 110c have that at least two isolated, centers are aimed at and basic through hole 110c1, the 110c3 consistent with described bearing pin of size so that described bearing pin 108 be arranged in wherein.
Wherein, described mid portion 110c comprise the base portion 110c5 of approximate horizontal and the 110c7 of the first side wall section that extends perpendicular to the direction of described bearing pin 108 from described base portion 110c5 and with isolated the second side wall portion 110c9 of the 110c7 of the first side wall section, aforementioned through-hole 110c1 is limited on the described the first side wall 110c7 of section, aforementioned through-hole 110c3 is limited on described the second side wall portion 110c9, and two through hole 110c3,110c1 center aligning and its diameter all are configured to be suitable for holding the size of described bearing pin 108.And this mid portion 110c is U-shaped.
More specifically, this lever 110 can be formed through machine work by stainless steel material.
Particularly, housing 102 can be formed by stainless steel, aluminium alloy or allumen, for example with the casting of ZAMAK aluminium, forms.
Support 104 be from the middle part of the inner surface of housing 102 to cavity in outstanding boss.Correspondingly, the middle part of lever 110 is connected on this support 104.Bearing pin 108 is roughly cylindrical, and it has the diameter basic identical or bigger with the aperture of the axis hole 103 of support 104, thereby makes this bearing pin 108 to be inserted in axis hole 103 with interference fit.Owing to adopting interference fit to connect lever 110 and support 104, both can be so that lever 110 can be around the axle center flexible rotating of bearing pin 108 with axis hole 103, can guarantee again very close to each other therebetween, to avoid the axial play of lever 110.This can guarantee adjustment screw 118 on lever 110 with respect to the invariant position of sensitive switch 116, thereby guarantees that logic switch 100 has higher control precision and stability.
Dynamic balance pedestal 106 forms the first horizontal surface and second horizontal surface of basic horizontal in support 104 both sides, it is corresponding with the two ends of lever 110 so that when lever 110 is positioned at horizontal level lever two ends spaced apart with the first horizontal surface of described dynamic balance pedestal 106 and the second horizontal surface (, do not contact) respectively respectively.When lever 110 stressed after when its bearing pin 108 clockwise rotates, the first horizontal surface laminating of the 110a of first of lever 110 and dynamic balance pedestal 106, thus this dynamic balance pedestal 106 to load balance power on lever 110 to stop lever 110 to continue to clockwise rotate; Similarly, when its bearing pin 108 rotated counterclockwise, the second horizontal surface of the second portion 110b of lever 110 and dynamic balance pedestal 106 was fitted after lever 110 is stressed, thereby this dynamic balance pedestal 106 is to load balance power on lever 110.In brief, this dynamic balance pedestal 106 is used for balance sensing element 112 and biasing element 114 and is carried in power on lever 110.
Sensing element 112 is used for the characteristic of the fluids such as induction fluid pressure, fluid temperature (F.T.), and loads the induction force that is associated with the fluid behaviour variation of responding on lever 110.In actual applications,, according to different application demands or demand for control, can use different transducers to be used as sensing element 112.As shown in the figure, this sensing element 112 can be contained in another housing and this another housing can with housing 102 Fluid Sealings link together.By this, one end of sensing element 112 can be responded to the characteristic to be measured (such as the fluid pressure in certain pipeline) of fluid and at the other end of sensing element 112, this be responded, thereby this response is exerted pressure with the 110a of first to lever 110 and the power that overcomes biasing element 114 makes lever 110 produce that anticlockwise moments realize.
Biasing element 114 can comprise a bias spring.In actual applications, bias spring can be set to be basically perpendicular to lever 110, so that its pretightning force that loads also is basically perpendicular to lever 110, thus the precision of raising logic switch 100.
This sensitive switch 116 is installed in housing 102, and it is connected on controlled device by binding post 120, to control the work of controlled device.Cable to sensitive switch 116 power supplies can be connected in housing 102 by the lead collar 122 on housing 102.
More specifically, adjustment screw 118 is arranged on the side of lever 110 towards sensitive switch 116, and it operationally engages sensitive switch 116.Particularly, when lever 110 clockwise rotated and contacts sensitive switch 116, this sensitive switch 116 was subject to the power that lever 110 applies via adjustment screw 118.When this power surpassed predetermined threshold, the state of sensitive switch 116 can change, and for example can be converted to open mode by closure state, perhaps can be converted to closure state by open mode, as for from which kind of state, starting to change, depended on predetermined design.When lever 110 rotated counterclockwise and leaves sensitive switch 116, this sensitive switch 116 no longer was subject to the power of lever 110, and when perhaps applied force was less than predetermined threshold, the state of sensitive switch 116 is respective change also.Easily understand, when lever 110 rotated counterclockwise, the conversion of the state of sensitive switch 116 just clockwise rotated with lever 110 and makes the state transition reverse of sensitive switch 116 generations.
In logic switch 100 disclosed in this invention, its lever 110 is all different with prior art, particularly, as described below aspect shape, structure and material characteristics:
The mid portion 110c of the lever 110 of logic switch 100 of the present invention defines two through hole 110c1,110c3 so that bearing pin 108 passes this two through holes.Only define a very long through hole with the mid portion of the lever of the logic switch of prior art and compare, owing to from the processing slotted hole, having become and only having processed two short holes, therefore, be more prone to process and more easily guarantee the tolerance of shaft-hole match.This is very important for the very high logic switch of required precision.And logic switch 100 disclosed by the invention processes by numerical control machining center, need to be by the drilling machine reaming than the through hole of the lever of the logic switch of prior art, and precision is higher, thereby can reduce friction, and improves the accuracy of switch.
In addition, lever-pin shaft structure disclosed by the invention can make bearing pin 108 expose from centre, and therefore, the contact-making surface between lever 110 and bearing pin 108 reduces, and frictional force also reduces thereupon, and precision is improved.
On the other hand, the material of the lever 110 of logic switch 100 of the present invention is stainless steel, and its life-span is increased greatly.
Moreover the lever that the aluminium of prior art is made needs die casting to form, and, needs die sinking that is; And the lever 110 that the stainless steel of logic switch 100 of the present invention is made does not need die sinking, has saved the die sinking expense from reducing costs.
The those skilled in the art of those the art can be by research specification, disclosed content and accompanying drawing and appending claims, understanding and enforcement other changes to the execution mode of disclosure.In the claims, 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 quoting during a part possibility enforcement of rights requires.Any Reference numeral in claim should not be construed as the restriction to scope.
The present invention is limited to the illustrative embodiments that presents in specification and accompanying drawing never in any form.Within all combinations of the execution mode that illustrates and describe (part) are interpreted as clearly and incorporate this specification into and be interpreted as and fall within the scope of the present invention clearly.And in the scope of the present invention of summarizing as claims, a lot of distortion are possible.In addition, any reference marker in claims should be configured to limit the scope of the invention.

Claims (6)

1. a logic switch, is characterized in that, comprising:
Housing, be furnished with support and the dynamic balance pedestal that is positioned at described support both sides in it, wherein, be provided with bearing pin on described support;
Lever, be pivotally connected on described bearing pin so that described lever two ends respectively near described dynamic balance pedestal in described housing, wherein said lever comprises in the first of described bearing pin one side, at second portion and the mid portion between described first and second portion of described bearing pin opposite side, described mid portion have that at least two isolated, center is aimed at and the basic through hole consistent with described bearing pin of size so that described bearing pin be arranged in wherein;
Sensing element, be used for responding to the variation of the outer fluid behaviour of described housing, and load the induction force distance that is associated with the fluid behaviour variation of responding in the first of described lever;
Biasing element, it is arranged in described housing and is used for loading the pre-fastening moment opposite with described induced moment in the first of described lever; And
Sensitive switch, the second portion of its relatively described lever are arranged in described housing, are used in response to described sensing element and described biasing element are carried in the variation of the moment on described lever closed or disconnect.
2. logic switch according to claim 1, it is characterized in that, described mid portion comprise the base portion of approximate horizontal and the first side wall section of from described base portion, extending perpendicular to the direction of described bearing pin and with isolated the second side wall portion of the first side wall section, has the first through hole in described the first side wall section, have the second through hole on described the second side wall portion, described the second through hole is aimed at described the first through hole center and its diameter all is configured to be suitable for holding the size of described bearing pin.
3. logic switch according to claim 2, is characterized in that, described mid portion becomes U-shaped substantially.
4. according to claim 1-3 described logic switches of any one, is characterized in that, described lever is that the stainless steel material machine work forms.
5. the lever of a logic switch, it is characterized in that, described lever has the part that the bearing pin for use as fulcrum passes, its be limited with that at least two isolated, center is aimed at and the basic through hole consistent with described bearing pin of size so that described bearing pin be arranged in wherein.
6. logic switch according to claim 5, is characterized in that, described lever is that the stainless steel material machine work forms.
CN2013103177352A 2013-07-25 2013-07-25 Logic switch and lever thereof Pending CN103390526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013103177352A CN103390526A (en) 2013-07-25 2013-07-25 Logic switch and lever thereof

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Application Number Priority Date Filing Date Title
CN2013103177352A CN103390526A (en) 2013-07-25 2013-07-25 Logic switch and lever thereof

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CN103390526A true CN103390526A (en) 2013-11-13

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0747918A1 (en) * 1993-11-05 1996-12-11 Furnas Electric Company Pressure switch
CN101430987A (en) * 2007-11-06 2009-05-13 上海立新液压有限公司 Pressure relay
CN102436965A (en) * 2011-12-27 2012-05-02 上海瑞勃思能源科技有限公司 Logical switch
CN202549713U (en) * 2012-03-31 2012-11-21 潍坊金丝达环境工程股份有限公司 Contactless pressure relay

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0747918A1 (en) * 1993-11-05 1996-12-11 Furnas Electric Company Pressure switch
CN101430987A (en) * 2007-11-06 2009-05-13 上海立新液压有限公司 Pressure relay
CN102436965A (en) * 2011-12-27 2012-05-02 上海瑞勃思能源科技有限公司 Logical switch
CN202549713U (en) * 2012-03-31 2012-11-21 潍坊金丝达环境工程股份有限公司 Contactless pressure relay

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Application publication date: 20131113