CN202793674U

CN202793674U - Differential pressure transducer

Info

Publication number: CN202793674U
Application number: CN201220439758.1U
Authority: CN
Inventors: 张宁; 胡军
Original assignee: WAL FUEL SYETEMS (HEFEI) Ltd
Current assignee: Anhui Weil Low Carbon Technology Co ltd
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2013-03-13
Anticipated expiration: 2022-08-31

Abstract

The utility model relates to a differential pressure transducer which comprises an internal component and an outer casing for packaging the internal component. The internal component comprises a pressure chip, a high-pressure chamber casing and a low-pressure chamber casing. Positive and negative electrode pins and a signal electrode pin are arranged on the pressure chip and are exposed outside the outer casing; and a high-pressure chamber and a low-pressure chamber connected with an oil inlet and an oil outlet of a filter respectively are further arranged on the pressure chip, and the high-pressure chamber casing and the low-pressure chamber casing are in seal connection and communicated with the high-pressure chamber and the low-pressure chamber respectively. According to the technical scheme, pressure of the oil inlet and the oil outlet acts on the high-pressure chamber and the low-pressure chamber of the pressure chip respectively, voltages are output by the signal electrode pin relative to the negative electrode pin under the action of differences between pressure of the oil inlet and pressure of the oil outlet, and the voltages are changed along with the pressure differences, accordingly, damping of the filter can be monitored in real time, and a filter element can be changed timely.

Description

Differential pressure pickup

Technical field

The utility model relates to a kind of sensor, relates to specifically a kind of differential pressure pickup.

Background technology

The fuel filter of diesel motor, in use for some time, the impurity that is filtered can accumulate gradually, and be attached to the surface of filter core, make the resistance of filter core become large, if can not change timely or clean, the power of engine is descended, can not normally use.And the user of engine often can not judge the congestion situations of fuel oil fitering element exactly, just rule of thumb, the periodic replacement filter core, can cause like this: one, filter core does not arrive and is changed in advance serviceable life, causes unnecessary waste; Two, filter core has arrived serviceable life, and is not in time changed, and affects the normal operation of engine.At present; domestic monitoring mode to the fuel oil fitering element degree of congestion mostly is the mechanical type pressing difference switch; because mechanically operated problem; the measuring accuracy of this switch is low; reliability is not high; and can only action report to the police under specific pressure difference, and phenomenon or the phenomenon of not reporting to the police often can appear reporting by mistake.

The utility model content

The purpose of this utility model is to provide a kind of differential pressure pickup, and can be the accurately real-time pressure difference with oil inlet and outlet of this differential pressure pickup is converted to voltage signal output, can realize Real-Time Monitoring to the degree of congestion of filter core, and measuring accuracy is high.

For achieving the above object, the utility model has adopted following technical scheme: comprise intraware and be used for encapsulating the shell body of intraware, described intraware comprises pressure chip, high pressure chest housing and low pressure chamber housing, described pressure chip just is provided with, negative electrode contact pin and signal electrode contact pin, just described, negative electrode contact pin and signal electrode contact pin are exposed outside respectively outside, also be provided with the high pressure chest and the low pressure chamber that link to each other with filter cleaner oil-in and oil-out respectively on the described pressure chip, described high pressure chest housing and low pressure chamber housing are tightly connected with high pressure chest and low pressure chamber respectively and connect.

Also be respectively equipped with high pressure chest interface and low pressure chamber interface on high pressure chest housing of the present utility model and the low pressure chamber housing, described high pressure chest interface and low pressure chamber interface link to each other with oil-in and the oil-out of filter cleaner respectively.

The position of matching with positive and negative electrode contact pin and signal electrode contact pin on the shell body of the present utility model is provided with electric connector jack.

Shell body integral molded plastic of the present utility model moulding.

High pressure chest housing of the present utility model and low pressure chamber housing are tightly connected by first, second O RunddichtringO and first, second back-up ring and high pressure chest and low pressure chamber respectively.

Intraware integral molded plastic encapsulation of the present utility model.

Shell body of the present utility model is provided with mounting hole, is provided with metallic sheath in the described mounting hole.

As shown from the above technical solution, the utility model acts on respectively high pressure chest and the low pressure chamber of pressure chip when the pressure of the oil-in of filter cleaner and oil-out, under the effect of oil-in pressure and oil-out pressure difference, the signal electrode contact pin has Voltage-output with respect to the negative electrode contact pin, this voltage changes along with the variation of pressure difference, the damping to filter cleaner that can be real-time is monitored, in time renew cartridge more.

Description of drawings

Fig. 1 is front view of the present utility model;

Fig. 2 is the A-A cut-open view of Fig. 1;

Fig. 3 is perspective view of the present utility model;

Fig. 4 is the perspective view of the utility model intraware;

Fig. 5 is the explosive view of the utility model intraware.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further:

Such as Fig. 1-a kind of differential pressure pickup shown in Figure 5, comprise intraware 1 and be used for encapsulating the shell body 2 of intraware 1, intraware 1 comprises pressure chip 11, high pressure chest housing 12 and low pressure chamber housing 13, pressure chip 11 just is provided with, negative

electrode contact pin

31,32 and signal electrode contact pin 33, just, negative

electrode contact pin

31,32 and signal electrode contact pin 33 be exposed outside respectively housing 2 outsides, further, on the shell body 2 with just, negative

electrode contact pin

31,32 and signal electrode contact pin 33 position of matching be provided with electric connector jack 21, electric connector jack 21 can make things convenient for being connected of differential pressure pickup and external circuit; Also be provided with the high pressure chest 14 and low pressure chamber 15 that link to each other with filter cleaner oil-in and oil-out respectively on the pressure chip 11, high pressure chest housing 12 and low pressure chamber housing 13 are tightly connected with high pressure chest 14 and low pressure chamber 15 respectively and connect, specifically, high pressure chest housing 12 and low pressure chamber housing 13 are respectively by first, the 2nd O RunddichtringO 41,42 and first, the second back-up

ring

43,44 are tightly connected with high pressure chest 14 and low pressure chamber 15, and connect, on high pressure chest housing 12 and low pressure chamber housing 13, also be respectively equipped with high pressure chest interface 16 and low pressure chamber interface 17, high pressure chest interface 16 and low pressure chamber interface 17 link to each other with oil-in and the oil-out of filter cleaner respectively, namely high pressure chest 14 and low pressure chamber 15 are sealed and matched with high pressure chest housing 12 and low pressure chamber housing 13 respectively, be communicated with high pressure chest interface 16 and low pressure chamber interface 17 on high pressure chest housing 12 and the low pressure chamber housing 13 simultaneously, thereby reach the state that links to each other with oil-in and the oil-out of filter cleaner.

As preferred version, the encapsulation of intraware 1 integral molded plastic, the net shape of formation product can guarantee that intraware tightens together, and relative displacement can not occur in the use; Shell body 2 is fixing with high pressure chest housing, low pressure chamber housing and the encapsulation of the parts that are connected thereof, and shell body 2 adopts nylon to add the moulding of glass fiber material integral molded plastic, has simplified assembly technology; The material of main part of pressure chip 11 adopts pottery and stainless steel, and corrosion resistance is strong like this.

As preferred version, shell body 2 is provided with mounting hole 22, and metallic sheath 23 presses fit in the mounting hole 22, and it is in order to prevent that differential pressure pickup is when mounted owing to the excessive conquassation that causes shell body 2 of the pretightning force of mounting screw that metallic sheath 23 is set.

The specific works process is as follows:

High pressure chest 14 on the pressure chip 11 and low pressure chamber 15 link to each other with oil-in and the oil-out of filter cleaner respectively, positive and negative

electrode contact pin

31,32 and signal electrode contact pin 33 respectively with pressure chip 11 welding and conductings, positive and negative

electrode contact pin

31,32 links to each other with negative pole with the positive pole of power supply respectively; When fuel oil is flowed through the filter core of filter cleaner, because the damping action of filter core, oil-in pressure P1 is greater than oil-out pressure P2, P1, P2 act on respectively high pressure chest 14 and the low pressure chamber 15 of pressure chip 11, under the pressure difference effect of P1 and P2, signal electrode contact pin 33 relative negative electrode contact pins 32 have a Voltage-output, this magnitude of voltage changes with the difference of P1 and P2, and be linear output, the size of the magnitude of voltage of exporting according to signal electrode contact pin 33, can monitor the variation of filter cleaner oil-in and oil-out pressure difference, i.e. the damping change of filter core.

The beneficial effects of the utility model are: 1) differential pressure pickup of the present utility model matches with external control circuit, but Real-Time Monitoring fuel oil fitering element congestion situations, timely renew cartridge more, and can make the life-span of filter core obtain maximum performance; 2) the mechanical drive problem of the utility model machinery-free type pressure difference switch is measured precisely, and reliability is high.

Above-described embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model all should fall in the definite protection domain of the utility model claims.

Claims

1. differential pressure pickup, it is characterized in that: comprise intraware (1) and be used for encapsulating the shell body (2) of intraware (1), described intraware (1) comprises pressure chip (11), high pressure chest housing (12) and low pressure chamber housing (13), described pressure chip (11) just is provided with, negative electrode contact pin (31,32) and signal electrode contact pin (33), just described, negative electrode contact pin (31,32) and signal electrode contact pin (33) be exposed outside respectively housing (2) outside, also be provided with the high pressure chest (14) and low pressure chamber (15) that link to each other with filter cleaner oil-in and oil-out respectively on the described pressure chip (11), described high pressure chest housing (12) and low pressure chamber housing (13) are tightly connected with high pressure chest (14) and low pressure chamber (15) respectively and connect.

2. differential pressure pickup according to claim 1, it is characterized in that: also be respectively equipped with high pressure chest interface (16) and low pressure chamber interface (17) on described high pressure chest housing (12) and the low pressure chamber housing (13), described high pressure chest interface (16) and low pressure chamber interface (17) link to each other with oil-in and the oil-out of filter cleaner respectively.

3. differential pressure pickup according to claim 1 is characterized in that: the upper position of matching with positive and negative electrode contact pin (31,32) and signal electrode contact pin (33) of described shell body (2) is provided with electric connector jack (21).

4. differential pressure pickup according to claim 1 is characterized in that: described shell body (2) integral molded plastic moulding.

5. differential pressure pickup according to claim 1 is characterized in that: described high pressure chest housing (12) and low pressure chamber housing (13) are tightly connected with high pressure chest (14) and low pressure chamber (15) by first, second O RunddichtringO (41,42) and first, second back-up ring (43,44) respectively.

6. differential pressure pickup according to claim 1 is characterized in that: the encapsulation of described intraware (1) integral molded plastic.

7. differential pressure pickup according to claim 1, it is characterized in that: described shell body (2) is provided with mounting hole (22), is provided with metallic sheath (23) in the described mounting hole (22).