CN102810431B - Differential pressure switch - Google Patents

Abstract

The present invention relates to a kind of differential pressure switch, it includes a housing, first housing parts of this housing and the second housing parts form a construction unit and jointly limit an inner chamber, and this inner chamber is divided into the first pressure chamber with the first compression fittings and the second pressure chamber with the second compression fittings by diaphragm device.Differential pressure switch also includes the 3rd housing parts, can take ground fixed structure unit and the 3rd housing parts away and the second housing parts jointly limits one and connects chamber on the 3rd housing parts.One fixing switch contact part and a quick acting contact part being adjacent to switch contact part at on-position handled by diaphragm device is set in the second pressure chamber.Switch contact part and quick acting contact part are connected with each plug contacts part, described plug contacts part is arranged on, with configuration, the connecting terminal part synergism being connected in chamber on the 3rd housing parts, making when construction unit is arranged on the 3rd housing parts, each plug contacts part engages with each connecting terminal part.

Description

Differential pressure switch

Technical field

The present invention relates to a kind of differential pressure switch, comprising: housing, the first housing parts of this housing With second housing parts formed a construction unit and jointly limit an inner chamber, this inner chamber by Diaphragm device is divided into the first pressure chamber with the first compression fittings and the second pressure chamber；It is arranged on Spring in one pressure chamber, this spring at side and diaphragm device opposite side be used for regulating bullet The adjusting means synergism of spring pretension；At least one fixing opening being arranged in the second pressure chamber Close contact part；It is similarly disposed in the second pressure chamber, that handled by diaphragm device, in connection position Put the quick acting contact part being adjacent on switch contact part；And contact point part.

Background technology

In addition it is used for determining smaller pressure reduction and and then triggering according to the differential pressure switch of the present invention Corresponding circuit.Utilize differential pressure switch mainly can monitor the filter in vent passages and electric fan And the valve in primary/secondary adjusting means.It is also contemplated that by differential pressure switch as overheated Protect or be used for monitoring industrial air loop.

Traditional differential pressure switch has that caused, not enough switching accuracy or the pressure reduction of deficiency by structure Sensitivity.The switching accuracy of this deficiency is by the diaphragm of diaphragm suspension on housing and differential pressure switch Move with this not enough friction free contacted and cause.Diaphragm in tradition pressure difference switch is usually Only it is insufficient to without frictionally supporting.Additionally, traditional pressure difference switch is in most of the cases as complete Whole component assembling.Connect electric wire being connected to this and be probably on the pressure difference switch assembled completely Problem and functional fault can be caused.

Summary of the invention

Therefore it is an object of the invention to, it is provided that a kind of adjustable differential pressure switch, this differential pressure switch can To assemble simply and there is high pressure reduction sensitivity simultaneously.

This purpose is reached by the feature of embodiment according to the present invention.Illustrate excellent in the following description The form of implementation of choosing.

The present invention relates to a kind of differential pressure switch, this differential pressure switch includes a housing, the first of this housing Housing parts and the second housing parts form a construction unit and jointly limit an inner chamber.In Chamber is divided into the first pressure chamber with the first compression fittings and with the second pressure by a diaphragm device Second pressure chamber of power joint.Additionally, housing has the 3rd housing parts of a formation base, Can fix with taking away on 3rd housing parts described construction unit and the 3rd housing parts with Second housing parts jointly limits one and connects chamber.Differential pressure switch also has one and is arranged on the first pressure Spring in room, this spring at side and diaphragm device opposite side be used for regulating spring pre-tightening Adjusting means synergism.At least one fixing switch contact part is set in the second pressure chamber With one handled by diaphragm device, the quick acting that is adjacent in on-position on switch contact part Contact part, wherein, switch contact part and quick acting contact part are connected with each plug contacts part, Described plug contacts part sealingly extend through by the second housing parts formed in the second pressure chamber and company Connect the central floor panel between chamber.Each plug contacts part and configuration, setting on the 3rd housing parts Connecting terminal part synergism in connecting chamber, and make or rather when by described structure When unit is arranged on the 3rd housing parts, each plug contacts part enters with each connecting terminal part and connects Close.

By machinery setting in construction unit, this can complete or prefabricated in factory, protects Protect it from damaging and externalities and be supplied to user with having let us say that.Even The adjustment of differential pressure pickup can also be carried out when producing in theory.

3rd housing parts therefore can be the most such as on ventilation equipment due to selected composition Pre-assembled.Same each connecting terminal part can have been coupled to connect on electric wire and assemble regularly. All these work can be implemented in the case of not having the construction unit disposed.Switch at assembling pressure Time construction unit need not be splitted into each single parts.

Additionally, adjusting means, such as, apply pretightning force to spring, have the advantage that, i.e. Differential pressure switch can be used for bigger pressure differential range.

Adjusting means also allows for making pressure difference switch be matched with specific requirement.

Another advantage is, adjusting means can be conditioned under the assembled state of pressure difference switch, and There is not the danger contacted with conducting element.

Construction unit can not without damage split into or be divided into the first and second housing parts.First With the non-removable connection that second between housing parts such as realizes by ultrasonic bonding.

First compression fittings is one-body molded or is formed on the first housing parts, this first housing parts It it is the first pressure chamber configuration.Second compression fittings is one-body molded or is formed on the second housing parts, This second housing parts is the second pressure chamber configuration.

Base can be assemblied on wall, the most just connection is wired on this base, then Construction unit is arranged on base.

Each plug contacts part and each connecting terminal part through central floor panel have flat contacts, this A little flat contacts are constructed so that the sword shape part of each plug contacts part is joined to each connecting terminal part During one is pitched by the contact of two fingers formation.

Another form of implementation relates to a kind of pressure difference switch, and this pressure difference switch includes a second switch contact Part, this second switch contact part is arranged in the second pressure chamber, and wherein, quick acting contact part can To be moved back and forth by diaphragm device between the two switch contact part.

Thus can not only distinguish between two states " on " and "off", and at shape State " the first on-off circuit is connected " or " the first on-off circuit disconnects " are with " second switch circuit breaks Open " or " second switch circuit ON " between distinguish.Thus people control connect, such as Control air register instrument time be more flexibly and various control probability can be selected.

Second switch contact part is connected with a plug contacts part equally, and wherein, this plug contacts part is again Can connect by connecting terminal part corresponding with.

According to another form of implementation, construction unit can be fixed on cup-shaped by buckle connecting structure On three housing parts.

Buckle connecting structure is typically removable attachment structure.The most when needed can be by structure Unit removes from the 3rd housing parts again, and this simplifies structure when functional fault or when defective The replacing of unit.

There is device according to the present invention, these devices allow construction unit only the most predetermined at one The relative position to each other that is between the 3rd housing parts and construction unit in be arranged to On three housing parts.

Construction unit is stoped to be inserted to mistakenly on the 3rd housing parts by this feature.Thus be excluded that Loading error.In addition guarantee to make each plug contacts part and relevant connecting terminal part from being dynamically connected.

Each device is configured to the pin of different molding at this, and these pins can only be joined to corresponding shaping respectively Hole in.Each pin and hole are the most one-body molded in central floor panel or on the 3rd housing parts at this. Substantially it is also possible to arrange each pin and hole unevenly, in order to can be by construction unit only at one Relative position about the 3rd housing parts is arranged on the 3rd housing parts.

According to another form of implementation, central floor panel extends at least close to being parallel to diaphragm device.

Thus, differential pressure switch is configured to compact and at construction unit or central floor panel and the 3rd shell Connection between body component is stable.Use additionally, there is enough spaces in such composition To arrange each switch contact and each quick acting contact.

In a preferred form of implementation, the 3rd housing parts has and is preferably provided with wearing in the sidewall Logical portion is used for connecting electric wire.

This clean and tidy assembling allowing to connect electric wire and simple guiding.In addition avoid damaging connecting electricity Line.

According to another preferred form of implementation, diaphragm device has a diaphragm dish and being centrally located Being arranged on diaphragm on diaphragm dish, annular, flexible in perimeter sides, this diaphragm is at radial outside It is fixed on housing.

Diaphragm dish is configured to rigidity, such as, be made up of the plastics of a kind of dimensionally stable, simultaneously diaphragm As title is made up of material, the such as silicones of a kind of flexibility with having been described above.

The advantage of such composition of diaphragm device is, on the one hand can be excellent by pretightning force by spring It is applied on diaphragm dish with changing, and when on the other hand there is pressure reduction between first and second pressure chamber The motion of diaphragm dish is allowed by diaphragm.

Another advantage is, the diaphragm dish of rigidity can handle quick acting contact without difficulty.

Diaphragm is bearing on diaphragm dish in perimeter sides by groove-protuberance attachment structure.Diaphragm equally by Groove-protuberance attachment structure is bearing on housing and is additionally clamped in the first housing parts and second Between housing parts.

According to another particularly preferred form of implementation, adjusting means has one about the first housing parts The spring shield rotationally fixedly supported and a regulation screw can handled from hull outside, wherein, spring Cover can move back and forth along screw longitudinal axis by the rotation of regulation screw and spring is at diaphragm device And work between spring shield.

By spring shield, regulation screw and diaphragm device between synergism, can be simply The pretightning force of spring is regulated by rotating regulation screw.Regulation screw is bearing in the first housing parts On.

Even if additionally, can also be from hull outside when construction unit is arranged on the 3rd housing parts Regulate simply and mate the pretightning force of spring if desired and thus be accordingly used in the pressure reduction of conversion.

First pressure chamber and the second chamber arrangement become that seal with versus environmental the most each other, preferably Airtight.

When diaphragm device is not at resting state, the first pressure chamber has relative to the second pressure chamber Superpressure.

According to the present invention, spring is bearing on spring shield with the one end towards diaphragm device and with face To one end of the first housing parts and one and diaphragm device, if desired and the holding that is connected of diaphragm dish Element synergism so that holding element or diaphragm device are being applied in bullet on the direction of housing Spring force.

If spring shield moves towards the direction of housing, then the pretightning force of spring becomes big, and if bullet Spring cover moves towards the direction of diaphragm, then pretightning force diminishes.Because holding element or diaphragm device quilt Press to housing and be under static state close to this housing, so need not the list for diaphragm device Only backstop.

Holding element can also such as be configured to keep sleeve, keep arm or retaining clip.

In another preferred form of implementation, spring and holding element have distance from regulation screw.

Thus avoid producing friction between regulation screw and spring or holding element.Therefore, diaphragm Dish can be almost without frictionally moving together with holding element, diaphragm and spring.

According to another form of implementation, the first housing parts rotatably supports one and regulates screw Synergistic, visible from hull outside, set graduated disk, and make or rather Must rotate together by disk when regulating screw and rotating.

Thus can regulate pressure limit simply, differential pressure switch should work in this pressure limit. The pretightning force of spring may be described as visible to a certain extent.

Disk can also be any other application configuration, or is provided with scale.

It is provided with a speed reduction gearing between regulation screw and disk.Regulation screw has two Screw thread.

According to the present invention, diaphragm dish has a push rod towards the side of the second pressure chamber, by this Push rod can handle quick acting contact.

By using push rod, determine the contact point between diaphragm dish and quick acting contact and letter The structure of Switching machinery.

In another form of implementation, diaphragm dish can be fixed on holding element by the attachment structure of buckle On.

Therefore, diaphragm dish Fixed Design in holding element becomes simple.

The attachment structure of buckle can be such as by composition in holding element or on diaphragm dish Tongue piece and the corresponding recess on diaphragm dish or in holding element reach.

According to another preferred form of implementation, can by an adjustment screw being bearing in central floor panel The position of regulation switch contact part, described adjustment screw can be from construction unit external control.

Switching point when this allows regulation quick acting contact to redirect.

In addition also the differential pressure switch sensitivity about pressure reduction can be regulated in factory by this adjustment screw.

In the case of the effect not having diaphragm device, quick acting contact part touches with following switch Put part, be therefore connected with that switch contact part being closer to be connected chamber.If diaphragm device Have passed past switching point, then quick acting contact part with above switch contact part, therefore with closer to That switch contact part in the first pressure chamber is connected.

Accompanying drawing explanation

Preferably form of implementation is shown graphically in the attached figures in 1 to 6.Wherein:

Fig. 1 illustrates one according to the side view of the differential pressure switch of the present invention；

Fig. 2 illustrates the front view of differential pressure switch；

Fig. 3 illustrates the top view of differential pressure switch；

Fig. 4 illustrates the sectional view of the line IV-IV intercepting along Fig. 3；

Fig. 5 illustrates the sectional view of the line V-V intercepting along Fig. 3；With

Fig. 6 illustrates the sectional view of the line VI-VI intercepting along Fig. 3.

Detailed description of the invention

Fig. 1 illustrates the side view of a differential pressure switch 10.Housing 12 include the first housing parts 14, Second housing parts 16 and the 3rd housing parts 18, the 3rd housing parts concurrently forms base 20. First housing parts 14 and the second housing parts 16 are collectively forming a construction unit 22, this structure Unit is arranged on the 3rd housing parts 18 by buckle connecting structure 24.First and second housings Parts 14,16 limit an inner chamber 25 (see Fig. 4) jointly.Buckle connecting structure 24 has two Individual clamping plate 26 opposite each other, the two clamping plate are formed on the 3rd housing parts 18.These folders On protuberance 28 that is that plate 26 is hooked in corresponding shaping and that arrange, these protuberances are formed in the second shell On body component 16.By pushing each clamping plate 26 on the direction away from the 3rd housing parts 18 open, can Take buckle connecting structure 24 apart.

First housing parts 14 has the first compression fittings 30, and the second housing parts 16 has Two compression fittings 32.Pipe or hoseline (the most not shown) may be coupled to these pressure and connect On 30,32.But it is also contemplated that one in these compression fittings 30,30 is vacated and thus Measure the pressure change/pressure reduction relative to environment.

First housing parts 14 be configured to lid, second and the 3rd housing parts 16,18 respectively constitute For cup-shaped component.First housing parts 14 has multiple opening in the marginal area 34 outside Mouth 36.Multiple protruding 40 are had on cup-shaped the second housing parts 16 on top edge 38, these Projection is joined in the opening 36 of the second cup-shaped housing parts 16 or through these openings.First Housing parts 14 rotationally fixedly and is fixedly provided on the second housing parts 16 and construction unit 22 are consequently formed.Connection between first and second housing parts 14,16 is firm and not Dismountable.This firmly connects and can such as realize by ultrasonic bonding.

Base 20 includes a buck plate 42, and this buck plate has multiple space 44 (can in Fig. 3 It is best seen from) for such as by the assembling of screw.It is also contemplated that at the 3rd housing parts 18 Go up or on base 20, constitute multiple buck plate 42.

3rd housing parts 18 also has a penetrating part 46.The example of flexibility is embedded in penetrating part 46 Such as the element 48 being made up of rubber.Flexible element 48 has breach 50 (see Fig. 2), connects electricity Line (not shown) can pass this breach.Breach 50 constructs conglobate.Flexible element 48 Selected constitute allow to connect the airtight of electric wire or at least close to airtight connection.

First housing parts 14 has the jut 54 of blind hole shape, these juts on upside 52 May be used for such as being assemblied on wall, if this is desirable to the first housing parts 14.No Cross assembling generally to realize in base side.

Figure 2 illustrates the view of differential pressure switch 10.The first compression fittings 30 can be found out well With the second compression fittings 32.Can find out well equally penetrating part 46, flexible element 48 and The flexible breach 50 in element 48.

One of them clamping plate 26 engaged with one of them protuberance 28 are set directly at penetrating part Above in the of 46.Another clamping plate 26 are arranged on opposed side, equally another protuberance 28.

Fig. 3 illustrates that differential pressure switch 10 is from top view above.Can find out well in base 20 Or the space 44 in buck plate 42.Also can see opening 36 and the jut of blind hole shape well 54, protruding 40 are joined in these openings.

Being provided with an adjusting means 56 on the first housing parts 14, this adjusting means has a tune Joint screw 58 and one carries graduated disk 60.Disk 60 regulate screw 58 rotate time by Gear connection structure 61 rotates together with this regulation screw.Ring 64 and the composition of regulation screw 58 Head 62 for gear engages each other.Gear connection structure 61 has the composition of regulation screw 58 For the head 62 of gear with equally constitute the ring 64 (see Fig. 4) for gear, this ring is firmly attached to Disk 60.Therefore, when regulating screw 58 and rotating, disk 60 rotates together.The quarter of disk 60 Degree can be any other user printing in factory.Additionally, on the first housing parts 14 Constitute the datum mark having arrow 66 form.By arrow 66, disk 60 is relative to datum mark Or the regulation of arrow 66 is visible.

Fig. 4 illustrates the sectional view of the line IV-IV intercepting along Fig. 3.First compression fittings 30 is passed through In first pressure chamber 68, the second compression fittings 32 is passed through in the second pressure chamber 70.First pressure Room 68 is formed by the first housing parts 14 and a diaphragm device 72, and this diaphragm device includes a film Sheet dish 74 and the diaphragm 76 of an annular, and the first pressure chamber is by diaphragm device 72 and the second pressure Power room 70 separates.The lip 78 of the diaphragm 76 of annular is pressed into recessed by the first housing parts 14 In groove 80 and so firmly holding, this groove prolongs along the circumference of the second cup-shaped housing parts 16 Stretch and be arranged on the upper end of the second cup-shaped housing parts 16.Diaphragm 76 is by inner lip 82 Being bearing on diaphragm dish 74, this inner lip is embedded on diaphragm dish 74 in the inner groovy 84 constituted. Inner groovy 84 is open towards the direction of the first housing parts 14.

Regulation screw 58 puts in the first pressure chamber 68 and screws in a spring shield 86.Spring shield 86 can along regulation screw 58 move back and forth and by mutually opposing guide rail 88 rotationally fixedly but can Keeping movably, these guide rails are integrally formed on the first housing parts 14 and put in the first pressure In power room 68.Spring shield 86 thus can move along the screw longitudinal axis A of regulation screw 58, and And or rather by the rotation of regulation screw 58.Along screw longitudinal axis A, one spring 90 is set. Regulation screw 58 extends through the center of spring 90.Spring 90 is with towards the one of diaphragm device 72 End bearing is bearing in a holding element 92 with the one end towards housing 12 on spring shield 86 Upper (see Fig. 5).Spring 90 and holding element 92 have a segment distance from regulation screw 58, from And the fortune of spring 90 and holding element 92 and therefore diaphragm device can be realized almost without friction Dynamic.In the ideal case, motion is entirely without frictionally realizing.

Therefore spring 90 can be regulated by the rotation of regulation screw 58 by the device described Pretension.

It is provided with an O between head 62 and first housing parts 14 of regulation screw 58 Sealing member 94.Disk 60 is sleeved on a jut 96 constituted on the first housing parts.The One housing parts 14 has four reinforcements 98, these four reinforcements in side in the first housing section At opposite side in an annular projection 102 of the first housing parts 14 on the inner side 100 of part 14 On be integrally formed.These four reinforcements along the first housing parts 14 circumference with 90 angle Spacing is arranged.

Second pressure chamber 70 is formed, in the middle of this by the second housing parts 16 and a central floor panel 104 Base plate by the second housing parts 16 relative to 106 points of the connection chamber formed by the 3rd housing parts 18 Separate.

Diaphragm dish 74 has the structure of rib shape, this structure towards the side of the first pressure chamber 68 For strengthening.Diaphragm dish 74 has a push rod 110 towards the side of the second pressure chamber 70.Push away Bar 110 is arranged on the quick acting contact 112 in the second pressure chamber 70 for handling one.Fast quick-action Making contact 112 and have a quick acting contact part 113, this quick acting contact part can be on one , towards below the switch contact part 114 and of the first pressure chamber 68, towards the second pressure Move back and forth between the switch contact part 116 of room 70.One is arranged on quick acting contact part 113 On contact element 118 come in contact with corresponding switch contact part 114/116 respectively.

On off state shown in the diagram is equivalent to such instantaneous photo (between the extremely short time Every), wherein, contact element 118 or quick acting contact part 113 neither touch with following switch Point part 116, the most it is not in switch contact part 114 above and contacts.

Under static state, therefore when there is not pressure reduction between first and second pressure chamber 68/70 Time, or this pressure reduction is the least or when being under the value of setting, quick acting contact part 113 with Following switch contact part 116 is in contact.This is equivalent to on-position.If pressure reduction is beyond setting Fixed value, then diaphragm device will be fast towards direction motion and the push rod 110 of the second pressure chamber 70 Quick-action is made contact 112 and is pressed to the direction of central floor panel 104, now one arrive switching point, fast quick-action Make contact part 113 just to redirect.In the first pressure chamber 68, one exists superpressure, occurs as soon as pressure reduction. Pressure reduction one arrives greatly the degree of switching point, and contact element 118 just redirects and and then with above Switch contact part 114 contacts.This is equivalent to open position.

In order to reach corresponding functional mode, quick acting contact 112 has a connection piece 120, This connector is arranged on the rocking bar 122 handled by push rod 110 and has the quick of contact element 118 Between action contact part 113.

Quick acting contact 112 or quick acting contact part 113 and the two switch contact part 114/116 passes central floor panel 104 by plug contacts part 125 respectively, these plug contacts parts electricity It is connected to switch contact part 114/116.Each plug contacts part 125 is such as by being firmly bonded with close Feud is held in central floor panel 104.On the side towards connection chamber 106, each plug contacts Part 125 has sword shape part 126 (see Fig. 5 and 6).

By one be bearing in central floor panel 104 and screw in adjustment screw 128 therein, permissible Regulate following switch contact part 116 and thus the position of switching point.This is in most of the cases Presetting in factory.If adjusting screw 128 to be screwed into and therefore towards the side of the first pressure chamber 68 To motion, then following switch contact part 116 is pressed to the first pressure chamber 68 by this adjustment screw Direction.If adjusting screw 128 be screwed out and therefore move, then towards the direction connecting chamber 106 Following switch contact part moves towards the direction connecting chamber 106 equally, owing to it is as elasticity The composition of cantilever.

In order to avoid switching when high pressure reduction occurs suddenly between first and second pressure chamber 68/70 Device is damaged, and constituting on the second housing parts 16 has four stop strut 130, and these four only Dynamic pillar limits diaphragm device 72 towards the motion connecting direction, chamber 106.Each stop strut 130 Be arranged so that they contact when contacting with diaphragm device 72 diaphragm dish 74 and thus stop towards The continuation campaign of central floor panel 104.

Being provided with connecting terminal part 132 in connecting chamber 106, these connecting terminal parts are at structure list The corresponding sword with each plug contacts part 125 is entered when unit 22 is arranged on the 3rd housing parts 18 The connection of shape part 126.Each connecting terminal part 132 is held in the 3rd housing parts by screw 134 In 18.

The penetrating part 46 for connecting electric wire (not shown) can be found out the most equally well And each clamping plate 26 of buckle connecting structure 24 and each protuberance 28.

Fig. 5 illustrates the sectional view of the line V-V intercepting along Fig. 3.Holding element 92 is by a buckle Attachment structure 136 firmly keep diaphragm dish 74.The attachment structure 136 of removable buckle has Keep tongue piece 138, these keep tongue pieces be snapped into be arranged on diaphragm dish 74 towards the first pressure chamber In each recess 140 on the side of 68.

The composition of following and above switch contact part 114/116 can be found out in Figure 5 well. It is arranged on each connecting terminal part 132 connected in chamber 106 and there are each two fingers 142, accordingly The corresponding sword shape part 126 of plug contacts part 125 be joined in described finger.Finger 142 It is configured so that each sword shape part 26 is clamped.Selected by sword shape part 126 and finger 142 The composition selected, can dispose construction unit 22 without difficulty or be snapped into the 3rd housing parts 18 Go up or connect on chamber 106.

Constitute on the second housing parts 16 and on the 3rd housing parts 18 and have device 144, this A little devices allow only between construction unit 22 and the 3rd housing parts 18 one the most predetermined Relative position in construction unit 22 is arranged on the 3rd housing parts 18.Device 144 includes Two cylinders 146 constituted on the 3rd housing parts 18, wherein, the two cylinder 146 One of there is laterally protruding flange (not shown).That cylinder 146 is joined to constitute accordingly, It is arranged in the sleeve 148 on the second housing parts 16.One of the two sleeve 148 is configured to That cylinder 146 with the flange of protrusion can be engaged into it.There is the convex of protrusion The cylinder 146 of edge can only be joined in one of the two sleeve 148, in order to construction unit 22 Plug-in mounting on the 3rd housing parts 18 is only at the two component (construction unit 22 and the 3rd housing Parts 18) a turned position in be only possible.

Fig. 6 illustrates the top view of the section of the line VI-VI intercepting along Fig. 3.It is arranged on central floor panel Adjustment screw 128 in 104 is in following switch contact part 116 and contacts, this switch contact Part is configured to elastic cantilever.Elastic cantilever has returning place force, and this returning place force is by cantilever correspondingly The most again push back from the direction deflecting towards resting position.Therefore when being executed by adjustment screw 128 The power added or displacement are latched in adjustment screw 128 when reducing or make it fall back when reversing, opening below Close contact part 116 and correspondingly back within resting position.Can find out that the two is opened well equally Close contact part through central floor panel 104.

It is contemplated that diaphragm device 72 to be configured to a unique component.Such as consider rubber, It is strengthened at center and constitutes accordingly the thickest and have in a radially outward direction along screw The thickness of the reduction that longitudinal axis A is measured.

Buckle connecting structure 24 between construction unit 22 and the 3rd housing parts 18 can also It is force closure, such as by the Magnet of strength.

Claims (16)

1. differential pressure switch (10), including: housing (12), first housing parts (14) of this housing Form a construction unit (22) with the second housing parts (16) and jointly limit an inner chamber (25), this inner chamber is divided into the first pressure chamber (68) and the second pressure by diaphragm device (72) Room (70), described first pressure chamber is with the first compression fittings (30)；It is arranged on the first pressure chamber (68) spring (90) in, this spring at side and diaphragm device (72) opposite side with For regulating adjusting means (56) synergism of spring (90) pretension；At least one is arranged on The first fixing switch contact part (116) in second pressure chamber (70)；It is similarly disposed at second In pressure chamber (70), that handled by diaphragm device (72), in on-position (119) patch Tight quick acting contact part (113) on the first switch contact part (116)；And connect tactile Point part (132), it is characterised in that the second pressure chamber (70) has the second compression fittings (32), There is the 3rd housing parts (18) forming base (20), desirable on the 3rd housing parts Fix described construction unit (22) and the 3rd housing parts with walking together with the second housing parts (16) limit one together and connect chamber (106), the first switch contact part (116) and fast quick-action Making contact part (113) to be connected with each plug contacts part (125), described plug contacts part is close Feud through by the second housing parts (16) formed the second pressure chamber (70) be connected chamber (106) Between central floor panel (104), and each plug contacts part (125) with configuration, the 3rd It is arranged on each connecting terminal part (132) connected in chamber (106) on housing parts (18) to work in coordination with Effect so that when described construction unit (22) being arranged to the 3rd housing parts (18) being upper, Each plug contacts part (125) enters with each connecting terminal part (132) and engages.

2. according to the differential pressure switch described in claim 1, it is characterised in that at the second pressure chamber (70) second switch contact part (114), and quick acting contact part (113) it are provided with in Can be filled by diaphragm between the first switch contact part (116) and second switch contact part (114) Put (72) to move back and forth.

3. according to the differential pressure switch described in claim 1 or 2, it is characterised in that described structure Unit (22) can be fixed on the 3rd cup-shaped housing parts (18) by buckle connecting structure (24) On.

4. according to the differential pressure switch described in claim 1 or 2, it is characterised in that there is device (144), described device allow construction unit (22) only the 3rd housing parts and construction unit it Between a unique predetermined relative position in be arranged on the 3rd housing parts (18).

5. according to claim 1 or 2 described differential pressure switches, it is characterised in that the middle end Plate (104) extends at least close to being parallel to diaphragm device (72).

6. according to the differential pressure switch described in claim 1 or 2, it is characterised in that the 3rd housing Parts (18) have penetrating part (46) and are used for connecting electric wire.

7. according to the differential pressure switch described in claim 1 or 2, it is characterised in that diaphragm device (72) there is the diaphragm dish (74) being centrally located and be arranged on the annular on diaphragm dish in perimeter sides Flexible diaphragm (76), this diaphragm is fixed on housing (12) at radial outside.

8. according to the differential pressure switch described in claim 1, it is characterised in that adjusting means (56) There is the spring shield (86) rotationally fixedly supported about the first housing parts (14) and can be from housing (12) the regulation screw (58) of external control, wherein, spring shield (86) can be by regulation spiral shell The rotation of nail (58) moves back and forth along screw longitudinal axis (A), and spring (90) is at diaphragm Work between device (72) and spring shield (86).

9. according to the differential pressure switch described in claim 8, it is characterised in that spring (90) with One end towards diaphragm device (72) is bearing on spring shield (86) and with towards the first housing One end of parts (14) with and the holding element (92) that is connected of diaphragm device (72) is collaborative makees With so that holding element (92) is applied in spring force on the direction towards housing (12).

10. according to the differential pressure switch described in claim 9, it is characterised in that spring (90) and Holding element (92) has distance from regulation screw (58).

11. according to the differential pressure switch described in claim 8, it is characterised in that in the first housing section Rotatably support and regulate screw (58) on part (14) synergistic, from housing (12) Externally visible set graduated disk (60) so that the disk when regulating screw (58) and rotating (60) rotate together.

12. according to the differential pressure switch described in claim 7, it is characterised in that diaphragm dish (74) Towards the side of the second pressure chamber (70), there is push rod (110), can handle soon by this push rod Contact part (113) is made in quick-action.

13. according to the differential pressure switch described in one of claim 9 to 11 item, it is characterised in that Diaphragm dish (74) can be fixed in holding element (92) by the attachment structure (136) of buckle.

14. according to the differential pressure switch described in claim 1 or 2, it is characterised in that by supporting Adjustment screw (128) in central floor panel (104) can regulate the first switch contact part (116) Position, described adjustment screw can be from construction unit (22) external control.

15. according to the differential pressure switch described in claim 1 or 2, it is characterised in that the 3rd housing Parts (18) have the penetrating part (46) arranged in the sidewall and are used for connecting electric wire.

16. according to the differential pressure switch described in claim 12, it is characterised in that diaphragm dish (74) Can be fixed in holding element (92) by the attachment structure (136) of buckle.