CN103105154A

CN103105154A - Angular transducer

Info

Publication number: CN103105154A
Application number: CN2012104454339A
Authority: CN
Inventors: 土岐善邦
Original assignee: Azbil Corp
Current assignee: Azbil Corp
Priority date: 2011-11-11
Filing date: 2012-11-08
Publication date: 2013-05-15
Anticipated expiration: 2032-11-08
Also published as: CN103105154B; JP2013104708A

Abstract

An angular transducer disclosed makes tight attachment of a bearing and a rotary shaft difficult, machining of a through hole of a housing is easy, clamping problem is prevented, and anti-explosion gap is reduced. The through hole (6') is a straight through hole with the same diameter from an opening part at one end to an opening part at the other end. A first bearing (16) and a second bearing (17) are pressed into and fixed at one end opening part of the through hole (6') and the other end opening part of the through hole (6'). A sleeve cylinder (19) is loosely inserted in space (18) between the first bearing (16) and the second bearing (17) formed in the through hole (6'), a first anti-explosion gap (h1) is formed between an inner peripheral surface (19a) of the sleeve cylinder (19) and an outer peripheral surface (5a) of a rotary shaft (5), and a second anti-explosion gap (h2) is formed between an outer peripheral surface (19b) of the sleeve cylinder (19) and an inner peripheral surface (3a) of a housing (3), as a fire extinguisher, effect is taken.

Description

Angular transducer

Technical field

The present invention relates to detect the angular transducer of the anglec of rotation of turning axle.

Background technology

In chemical plant etc., in its flow being processed, variable valve used arranges steady arm always, by the aperture of this steady arm regulating and controlling valve.This steady arm comprises: obtain the setting aperture sent here from epigyny device and by the deviation between the actual aperture of variable valve feedback, and generate according to the electric signal of this deviation control algorithm section as control signal, the control signal that this control algorithm section is generated is transformed to the electric empty transformation component of air pressure signal, and will amplify from the air pressure signal of the empty transformation component of this electricity, supply with the air pressure signal enlarging section (pilot relay) (for example with reference to patent documentation 1) of the manipulater of variable valve as output pressure.

Use angular transducer as the displacement detecting section of the actual aperture that detects variable valve as the displacement of valve shaft in this steady arm, this angular transducer has by the turning axle of feedback rod according to the displacement rotation of valve shaft.Will be according to the electric signal of the anglec of rotation of the turning axle of this angular transducer signal as the actual aperture of expression, feed back to control algorithm section.

Fig. 2 illustrates the formation of the angular transducer shown in patent documentation 2.Fig. 2 (a) is the sectional drawing of seeing from the front, and Fig. 2 (b) is the sectional drawing that arrives from the side.It constitutes angular transducer 1, hold with in the housing 3 of cylinder 2 taking in the stationary cylinder oblique crank Z, be fixed with the turning axle 5 of yoke body 4 from its underside contain, and make the through hole 6 of upper end above housing 3 of turning axle 5 outstanding, then clog the following opening 9 of housing 3 with the lid 8 that magnetic sensor 7 is housed.

In being fixed in the yoke body 4 of turning axle 5, take in

magnet retaining member

10 and 2 blocks of

permanent magnets

11,12, magnetic sensor 7 be fixed in support platform 13 above.In addition, 14 are mounted in the set collar in the annular ditch of the top turning axle 5 that protrudes from housing 3, and the 15th, insert the ring between yoke body 4 and bearing use cylinder 2.

In angular transducer 1, turning axle 5 with bearing with the inner peripheral surface 2a of cylinder 2 as bearing surface, rotate with yoke body 4 with being integral.Like this, change in the lip-deep magnet 11 of magnetic sensor 7, the direction of 12 magnetic lines of force that produce, the resistance value of magnetic sensor 7 changes, and generates the electric signal according to the anglec of rotation of turning axle 5.

The steady arm that sometimes has this angular transducer is used in the environment that has explosion danger.At this moment, steady arm must have Antiexplosive structure.

For example, with angular transducer shown in Figure 21 during as the monomer Antiexplosive structure, with bearing with the gap h1 between the outer peripheral face 5a of the inner peripheral surface 2a of cylinder 2 and turning axle 5 as TIIS(Industrial Security technological associations) the d(gap of stipulating) * the I(degree of depth) flameproof gap.For example, at d=0.15mm and following, I=12.5mm and when above, the total (bearing is poor with the external diameter of the internal diameter of cylinder 2 and turning axle 5) that is set in the two gap h1 that survey of turning axle 5 is 0.15mm and following.

[patent documentation]

[patent documentation 1] Japan opens clear 62-28118 communique in fact

[patent documentation 2] Japan opens flat 11-83422 communique in fact

[patent documentation 3] Japan opens flat 02-55303 communique in fact

Summary of the invention

The problem that invention will solve

Yet, in bearing construction shown in Figure 2, for with bearing with the gap h1 between the outer peripheral face 5a of the inner peripheral surface 2a of cylinder 2 and turning axle 5 as flameproof gap, be necessary turning axle 5 without be supported on bearing with on the inner peripheral surface 2a of cylinder 2 time oilyly, use the high material (material that rigidity is high) of mar proof as bearing with cylinder 2 and turning axle 5.In addition, because the regulation flameproof gap must consist of with metal, therefore with oil-impregnated sintered metal etc. as the material of bearing with cylinder 2, do not regard as and need refuel (not oiling from the outside), but the shortcoming that exists is to be adsorbed in the contained oil of cylinder 2 that this bearing uses when dust etc., turning axle 5 and bearing are close to cylinder 2, are easily caused turning axle 5 not rotate.

Therefore, such bearing construction shown in the 2nd figure of consideration employing patent documentation 3 is for Fig. 3 illustrates such bearing construction.In this bearing construction, the 1st bearing 16 and the 2nd bearing 17 are set to devices spaced apart on an end and the other end of the through hole 6 of housing 3, by inner peripheral surface 16a and the 17a supporting rotating shaft 5 of the 1st bearing 16 and the 2nd bearing 17.

In addition, the 1st bearing 16 and the 2nd bearing 17 are done and are circularized, and are pressed into the end that is fixed in through hole 6 and the peristome of the other end.Again, gap ha between the inner peripheral surface 16a of the 1st bearing 16 and the outer peripheral face 5a of turning axle 5, gap hb between the inner peripheral surface 17a of the 2nd bearing 17 and the outer peripheral face 5a of turning axle 5, not as flameproof gap, the gap hc that replaces between the inner peripheral surface 3a of the outer peripheral face 5a of turning axle 5 and housing 3 is flameproof gap.

Bearing construction if so, in

bearing

16,17, therefore its gap ha, hb can use the low material of mar proof as bearing 16,17 not as flameproof gap, and gap ha, hb also can obtain wider, can make bearing 16,17 and turning axle 5 between be close to and be difficult to occur.

Yet, due to the gap hc between the inner peripheral surface 3a of the outer peripheral face 5a of turning axle 5 and housing 3 as flameproof gap, therefore the problem that exists is, the through hole 6 of housing 3 can not be become from the peristome of an end the straight through hole that connects with the footpath to other end peristome, it is complicated that the shape of through hole 6 becomes, poor in processability.

In addition, when gap hc is too small, namely when respond want with the size (gap) of flameproof gap d than 0.15mm less require the time, the problem of blocking between the outer peripheral face 5a of the inner peripheral surface 3a of housing 3 and turning axle 5 occurs.In addition, the machining precision of the through hole 6 of housing 3 also becomes strict.Otherwise when gap hc was decided to be the size that does not occur to block, the depth dimensions that should increase the gap satisfied explosion-proof performance, and total length is just elongated.

The present invention does for solving such problem, and its purpose is to provide and is difficult to being close between bearing and turning axle occur, and the through hole handling ease of housing, and the problem of not blocking can be dwindled the angular transducer of flameproof gap.

Solve the means of problem

For reaching the present invention of this purpose, the angular transducer that detects the anglec of rotation of turning axle is characterized in that possessing: the housing with the through hole that runs through turning axle; Be arranged to devices spaced apart on an end and the other end of through hole of housing, and turning axle carried out the 1st bearing and the 2nd bearing of axial support; Reach on the space that loosely is inserted between the bearing that is formed at the 1st interior bearing of through hole and the 2nd bearing, inner circumferential surface is relative with the outer peripheral face of turning axle by the 1st flameproof gap, and its outer peripheral face is by the 2nd flameproof gap sleeve relative with the inner peripheral surface of housing.

According to the present invention, on an end of the through hole of housing and the other end, the 1st bearing and the 2nd bearing are set, by the 1st bearing and the 2nd bearing supporting rotating shaft.In addition, sleeve cylinder loosely on space between the 1st bearing in being formed at through hole and the bearing of the 2nd bearing, form the 1st flameproof gap between the inner peripheral surface of sleeve and the outer peripheral face of turning axle, form the 2nd flameproof gap between the outer peripheral face of sleeve and the inner peripheral surface of housing.

At this moment, because in the 1st and the 2nd bearing and the gap between its turning axle also can be as flameproof gap, therefore can use the low material of mar proof as the 1st and the 2nd bearing, and its gap also can obtain widelyr, can make to be difficult to generation being close between the 1st and the 2nd bearing and turning axle.

In addition, by the formation on the space between the bearing that sleeve loosely is inserted in the 1st bearing that is formed in through hole and the 2nd bearing, the through hole that makes housing becomes possibility to other end peristome for the straight through hole that connects with the footpath from the peristome of one end, the simple shape of through hole, handling ease.

In addition, flameproof gap between the outer peripheral face of turning axle and the inner peripheral surface of housing clips sleeve and is divided into the 1st flameproof gap and the 2nd flameproof gap, in the 1st flameproof gap and the 2nd flameproof gap, for example the flameproof gap of 0.15mm is divided into 2, can not block problem, make requirement on machining accuracy not tight, and may dwindle the gap of flameproof gap.

The effect of invention

According to the present invention, owing on an end of the through hole of housing and the other end, the 1st bearing and the 2nd bearing being set, sleeve cylinder loosely on the space between the bearing of the 1st bearing and the 2nd bearing, form the 1st flameproof gap between the inner peripheral surface of this sleeve and the outer peripheral face of turning axle, form the 2nd flameproof gap between the outer peripheral face of sleeve and the inner peripheral surface of housing, therefore, make and be difficult to being close between bearing and turning axle occur, make the processing that is formed at the through hole on housing become easy, and do not block problem, can dwindle the gap of flameproof gap.

Description of drawings

Fig. 1 illustrates the pie graph of an example of angular transducer of the present invention.

Fig. 2 illustrates the pie graph of the angular transducer shown in patent documentation 1.

Pie graph when Fig. 3 is illustrated in the bearing construction that adopts in the angular transducer shown in patent documentation 1 shown in patent documentation 2.

Embodiment

Below, describe with reference to the accompanying drawings example of the present invention in detail.

Fig. 1 illustrates the pie graph of an example of angular transducer of the present invention.(a) of Fig. 1 is the sectional drawing of seeing from the front, and (b) of Fig. 1 is the sectional drawing that arrives from the side.In figure, the inscape that the symbolic representation identical with Fig. 3 is identical with the inscape that illustrated with reference to Fig. 3 or equal, the description thereof will be omitted.

In this angular transducer 100, the through hole 6 ' of the housing 3 that turning axle 5 is run through, peristome from the peristome of one end to the other end is the straight through hole that connects with the footpath, the 1st bearing 16 and the 2nd bearing 17 the be fixed peristome of the end that is pressed into this through hole 6 ' and the peristome of the other end.

In addition, in the space 18 between the 1st bearing 16 in being formed at through hole 6 ' and the bearing of the 2nd bearing 17, loosely insert the member that columnar stainless steel is made, as sleeve 19.This sleeve 19 forms the 1st flameproof gap h1 between the outer peripheral face 5a of inner circumferential surface 19a and turning axle 5, form the 2nd flameproof gap h2 between the inner peripheral surface 3a of its outer peripheral face 19b and housing 3, brings into play its function as flame snuffer.

Therefore in this bearing construction, because sleeve 19 works as flame snuffer, in the 1st bearing 16 and the 2nd bearing 17, gap ha, the hb between itself and turning axle 5 also can be as flameproof gap.Like this, can use low abrasive materials as the 1st bearing 16 and the 2nd bearing 17, gap ha, hb also can widen, and just are difficult to being close between the 1st bearing 16 and the 2nd bearing 17 and turning axle 5 generate.

In addition, in this bearing construction, by the such formation of sleeve cylinder 19 loosely in the space 18 between the bearing of the 1st bearing 16 and the 2nd bearing 17, the through hole 6 ' of housing 3 peristome from the peristome of one end to the other end can be become the straight through hole that connects with the footpath.Like this, the shape of through hole 6 ' is become simply, it is easy that the processing of housing 3 becomes.

In addition, in this bearing construction, flameproof gap between the outer peripheral face 5a of turning axle 5 and the inner peripheral surface 3a of housing 3 is divided into the 1st flameproof gap h1 and the 2nd flameproof gap h2 that clips sleeve 19, makes the gap of flameproof gap be divided into 2 with the 1st flameproof gap h1 and the 2nd flameproof gap h2.That is, when the gap of the flameproof gap between the inner peripheral surface 3a of the outer peripheral face 5a of turning axle 5 and housing 3 is 0.15mm, be positioned at turning axle 5 both sides the 1st flameproof gap h1 add up to that 0.075mm(is one-sided is 0.075mm/2).Be positioned at sleeve 19 both sides the 2nd flameproof gap h2 to add up to 0.075mm(one-sided for 0.075mm/2).Like this, the gap smaller of flameproof gap.

In addition, in this bearing construction, owing to keeping loosely inserting in the space 18 of sleeve 19 between the bearing of the 1st bearing 16 and the 2nd bearing 17, therefore do not occur in the problem of blocking between the inner peripheral surface of the outer peripheral face 5a of turning axle 5 or housing 3 yet.In addition, due to the insertion by sleeve 19, form flameproof gap h1, h2, therefore also unnecessarily be strict with the machining precision of the through hole 6 ' of housing 3.

In addition, in bearing construction shown in Figure 1, if remove sleeve 19, can be with angular transducer 100 as non-explosion-proof product.In addition, sleeve 19 is made as multiple, also may further dwindles flameproof gap.

[expansion of example]

Above, with reference to example, the present invention has been described, but has the invention is not restricted to above-mentioned example.In formation of the present invention and details, can do the accessible all changes of technician in technical scope of the present invention.

The explanation of symbol

3 housings, 3a inner peripheral surface, 4 yoke bodies, 5 turning axles, the 5a outer peripheral face, 6 ' through hole, 7 magnetic sensors, 8 lids, 9 openings, 10 magnet retaining members, 11,12 permanent magnets, 13 support platform, 14 set collars, 15 rings, 16 the 1st bearings, 17 the 2nd bearings, space between 18 bearings, 19 sleeves, 19a inner peripheral surface, 19b outer peripheral face, h1 the 1st flameproof gap, h2 the 2nd flameproof gap, ha, hb gap, 100 angular transducers.

Claims

1. angular transducer, the anglec of rotation that it detects turning axle is characterized in that possessing:

Housing with the through hole that is penetrated with described turning axle;

Be arranged to devices spaced apart on an end and the other end of through hole of described housing, and described rotating shaft carried out the 1st bearing and the 2nd bearing of axial support; And

Sleeve, described sleeve loosely is inserted in space between the bearing of described the 1st bearing that is formed in described through hole and described the 2nd bearing, inner circumferential surface is relative with the outer peripheral face of described turning axle by the 1st flameproof gap, and its outer peripheral face is relative with the inner peripheral surface of described housing by the 2nd flameproof gap.