CN2138338Y

CN2138338Y - Pressure relay

Info

Publication number: CN2138338Y
Application number: CN 92231619
Authority: CN
Inventors: 马连泰
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-23
Filing date: 1992-08-23
Publication date: 1993-07-14
Anticipated expiration: 2002-08-23

Abstract

The utility model relates to a pressure relay, which is especially suitable for being mounted in a lube oil and cooling system in a diesel engine. The utility model comprises a shell, a micro stroke switch, a corrugated pipe for sensing liquid pressure, an ejector rod, a lateral lever for enlarging the stroke of the ejector rod, a pressure adjusting spring, etc. The utility model is characterized in that the end part of the ejector rod is provided with the lateral lever which can enlarge the stroke by 1-2 times, so the measurement range of the pressure relay is enlarged. A normally open contact point, a light emitting diode and a displayer of a resistive are serially connected, so operators can conveniently observe that if the work of the relay is normal.

Description

Pressure relay

The utility model relates to a kind of pressure switch, can be used for the pressure control of fluid-pressure system, is specially adapted in the lubrication assistant and cooling system of diesel engine.

Employed pressure switch in existing diesel engine lubrication assistant and cooling system, employing be that push rod with sensed pressure output directly acts on the meeting and discussing of micro limit switch, as homemade TJYIA type pressure switch.Because this structure is comparatively complicated, is subjected to the restriction of lift rod stroke, makes the pressure control range of pressure switch less, only is 0.08～0.1MPa as TJYIA type pressure switch.Be not with display unit on this pressure switch, be difficult for being operated personnel when micro limit switch breaks down and discover.

The purpose of this utility model is exactly to overcome the deficiency that existing pressure switch exists, and utilizes horizontal lever that the stroke of push rod is amplified, to enlarge the pressure control range of relay.Install display additional and be easy to make operating personnel in time to find fault, so that in time get rid of.

The pressure switch that the utility model relates to comprises: be fixed on micro limit switch in the box housing with cover and the energising lead assemblies on the described box housing sidewall by support, the pressure-bearing shell of band fluid import and export also is housed on the right of this sidewall, its inner chamber is equipped with an end and is fixed on bellows on the guide holder lower surface, the push rod that the fore-set that can move along its axis is housed in the cavity that is formed by guide holder and bellows and is fixed on the fore-set upper end and can stretches out in the box housing along the guide holder centre bore.Its design feature is: the push rod end in putting in the box housing is provided with on an end fixes on described box housing by hinges fixing the sidewall, the other end acts on the horizontal lever on the meeting and discussing of micro limit switch, with described push rod pressure-adjusting spring is housed coaxially at this above the horizontal lever, this spring lower end is provided with lower spring cup and is pressed against steel ball on the horizontal lever by lower spring cup.The upper end of described spring leans upper spring seat and the locking nut in double as pressure adjustment usefulness.In the centre bore of described upper spring seat and locking nut, screw in the screw that is fixed on the tank shell upper side wall.Also be provided with the display of indication micro limit switch action on the described pressure switch.Length between the application point that the fixed hinge of the horizontal lever of application point distance of described push rod and horizontal lever and the horizontal lever of distance and micro limit switch are met and discussed is than being 1:1～1:2.Display is to terminate at normally opened contact, light-emitting diode and the resistance that positive source, the other end are contacted successively and be electrically connected by one, and the loop that is electrically connected with ground wire composition.

Owing to utilize horizontal lever that the stroke of push rod is concerned amplification by a certain percentage, make the pressure control range of pressure switch be extended to 0～1.8MPa.In addition, make designs simplification because of having reduced number of spare parts.Set up display in the relay, be convenient to operating personnel and find in time whether micro limit switch work is normal, in time to fix a breakdown.Whole pressure switch adopts closed structure, waterproof protection against the tide, thereby enlarged its scope of application.

Now details are as follows for the pressure switch that in conjunction with the accompanying drawings the utility model is related to:

Fig. 1 is the general assembly drawing of pressure switch.

Fig. 2 is the line map of display.

As shown in Figure 1, the pressure switch that relates to of the utility model comprises: be fixed on the micro limit switch 4 in the box housing 3 of plate 10 with cover by support 2 and be contained in fixedly energising lead assemblies 1 on box housing 3 sidewalls.The pressure-bearing shell 19 of band fluid import and export is housed on this sidewall the right, the bellows 17 that an end is fixed on guide holder 16 lower ends is equipped with in the chamber within it, in the cavity C that guide holder 16 in screwing in pressure-bearing shell 19 upper end screws and the bellows of lower end closed 17 form, the fore-set 18 that can move along its axis with bellows is housed coaxially and is fixed in the fore-set 18 upper end centre bores, and the push rod 15 that can in box housing 3, stretch out along guide holder 16 centre bores.Push rod 15 tops near sliding in the hole of guide holder 16 are provided with an end and are fixed on by hinge 14 on the sidewall of box housing 3, and the other end acts on the horizontal lever 13 on the meeting and discussing of micro limit switch 4.With push rod 15 pressure-adjusting spring 6 is housed coaxially above horizontal lever 13, this spring lower end is pressed against lower spring cup 11 and is pressed against on the steel ball 12 on the horizontal lever 13 by lower spring cup 11.The upper end of described spring 6 leans on the upper spring seat 7 of double as pressure adjustment usefulness, with and on locking nut 8.In the center screw of upper spring seat 7 and locking nut 8, screwed in the screw 9 of the upper wall that is fixed on box housing 3.Length between the application point that the fixed hinge 14 of the horizontal lever 13 of end points distance of push rod 15 and the horizontal lever 13 of distance and micro limit switch 4 are met and discussed is preferably 1:1.58 than being 1:1～1:2.The upper end of micro limit switch 4 is provided with the loop that normally opened contact K, LED and resistance R that display 5 is electrically connected through polyphone successively by a positive pole that terminates at power supply, the other end be electrically connected with ground wire and forms.

During work, when the fluid pressure through the inlet port B of pressure-bearing shell 19 inflow cavity A rises to a certain set pressure, force bellows 17 compression and promote fore-set 18 and the push rod 15 on it along moving on the centre bore of guide holder 16, the upper end of sensed pressure by described push rod 15 affacted on the horizontal lever 13, make horizontal lever 13 do clockwise swing around hinge 14 fulcrums of one end, laterally meeting and discussing of micro limit switch 4 of the other end of lever 13 promotion makes it to move, and the normally opened contact closure of ordering about in it is sent the signal of telecommunication that pressure raises, and connects the display loop simultaneously and makes diode displaying.

When the pressure in A chamber is reduced to a certain set pressure, each movement parts is to move with above-mentioned opposite direction, and the normally opened contact of micro limit switch 4 returns to normally open by closure state, and open circuit sends the signal of telecommunication that sensed pressure reduces, light-emitting diode opens circuit simultaneously, and display extinguishes.

Claims

1, a kind of pressure switch can be used for the pressure control of fluid-pressure system, is particularly suitable in the lubrication assistant and cooling system of diesel engine, and this pressure switch comprises:

Be fixed on the micro limit switch in the box housing and be installed in energising lead assemblies on the described box housing sidewall by support, the pressure-bearing shell of band fluid import and export also is housed on this sidewall, its inner chamber is equipped with an end and is fixed on bellows on the guide holder lower surface, the push rod that the fore-set that can move along its axis is housed in the cavity that is formed by guide holder and bellows and is fixed on the fore-set upper end and can stretches out in the box housing along the guide holder centre bore is characterized in that:

(a) described push rod end is provided with horizontal lever, and the length ratio between the application point that the application point of push rod end and horizontal lever is met and discussed apart from the fixed hinge of horizontal lever one end with apart from laterally the lever other end and micro limit switch is 1: 1～1: 2,

(b) laterally be provided with pressure-adjusting spring above the lever, its upper end relies on the locking nut of adjusting pressure and adjusts screw through upper spring seat, and its lower end is pressed against steel ball on the horizontal lever through lower spring cup,

(c) micro limit switch top is provided with between power supply and ground wire and has been connected in series the display that normally opened contact, light-emitting diode and resistance are formed.