CN2399574Y

CN2399574Y - Piezoelectric pericon valve

Info

Publication number: CN2399574Y
Application number: CN 99250930
Authority: CN
Inventors: 王子成; 党李军
Original assignee: Wuzhong Meter Co ltd
Current assignee: Wuzhong Meter Co ltd
Priority date: 1999-11-17
Filing date: 1999-11-17
Publication date: 2000-10-04
Anticipated expiration: 2009-11-17

Abstract

The utility model relates to a piezoelectric twin crystal valve, which is composed of piezoelectric ceramic crystal sheets. A U-shaped elastic electrode sheet is tightly clamped between an upper and a lower covers which are airtight coupled. An upper and a lower piezoelectric sheets partitioned by an electricity conductive interlayer are clamped between the elastic electrode sheet. The elastic electrode sheet is connected with a positive electrode threading out of the upper cover. The interlayer is connected with a negative electrode threading out of the lower cover. Different electrical voltages are exerted on the positive and the negative electrodes, and as a result, the two piezoelectric sheets can bend upwards or downwards. Consequently, the connection and the cut of gas circuits on the upper and the lower covers can be controlled. The gas inflow and outflow can be controlled. The utility model overcomes the defects of a traditional mechanical lever balance valve, and has the advantages of small volume, low cost, good performance, and intelligence facilitation.

Description

Piezoelectric bimorph body valve

The utility model relates to the gas-electric converter in pneumatic control field, particularly a kind of piezoelectric bimorph body valve of being made by piezoelectric constant.

In the pneumatic control field, people also still rest on and utilize the mechanical lever equilibrium structure to realize electric conversion, the valve of being made thus, and not only volume is big, complex structure, and the cost height.

The purpose of this utility model is to overcome the shortcoming of traditional mechanical lever or gas-electric converter, and the novel piezoelectric bicrystal that a kind of volume is little, cost is low, simple in structure valve is provided.

The purpose of this utility model is achieved in that a kind of piezoelectric bimorph body valve, it is characterized in that having a pair of loam cake that is tightly connected and the lower cover of making by insulating material, end in loam cake and lower cover is crimped with one unequal-sided " U " shape elastic electrode sheet, " U " shape gap of elastic electrode sheet accompanies the last piezo-electric sheet and the lower piezoelectric sheet of being separated by by a conduction interlayer, three's one end is fixed, and the other end is unsettled; On the position, long limit that covers corresponding to " U " shape elastic electrode sheet be provided with an electrode, cover down the minor face afterbody of it " U " shape elastic electrode of lower piezoelectric sheet with it electrical isolation be provided with another electrode, the electrode electrical isolation is passed the lower piezoelectric sheet and is electrically connected with the conduction interlayer; Be provided with outgassing nozzle at loam cake middle part, corresponding on the free end of piezo-electric sheet on cover and be provided with gas source nozzle; Following covering corresponding to lower piezoelectric sheet free end below is provided with a blowdown nozzles.

The utility model is the contrary a kind of novel valve of pressing effect and developing that utilizes piezoelectric constant, when applying the voltage of opposed polarity on two electrodes, on, the polarised direction of lower piezoelectric sheet produces a contraction mutually on the contrary, an extension, thereby will go up, following two bicrystal sheets are crooked up or down, and play the effect of switch gas source nozzle and blowdown nozzles, can adjust the size of gas circuit pressure thus, the utility model has overcome traditional mechanical balance bar stem valve, and to have a volume little, cost is low, simple in structure, reliable advantage of high precision has realized the purpose of this utility model preferably.

Make more detailed description below in conjunction with drawings and Examples.

Fig. 1 is a structural representation of the present utility model.

Embodiment:

Piezoelectric bimorph body valve as mentioned above, comprise insulation loam cake 3, lower cover 5 and elastic electrode compressing tablet 1, positive electrode 2, negative electrode 6, conduction interlayer 7, go up gas source nozzle 9 on piezo-electric sheet 4, lower piezoelectric sheet 8 and the upper and lower cover 3,5, blowdown nozzles 10, outgassing nozzle 11 etc.

With loam cake 3 and lower cover 5 combined pressures, guarantee that elastic electrode compressing tablet 1 is adjacent to the electrode surface of upper and lower piezo-electric sheet 1,2, make circuit turn-on, simultaneously upper and lower piezo-electric sheet 1,2 and conduction interlayer 7 one ends are fixed, and become that an end is fixed, the other end piezoelectric actuator freely.When positive source is received positive electrode 2, when power cathode being received on the negative electrode 6, according to the inverse piezoelectric effect of piezoelectric constant, because 1,2 making alive polarity differences of upper and lower piezo-electric sheet, last piezo-electric sheet 1 polarised direction and institute's making alive be contraction on the contrary mutually; Lower piezoelectric sheet 2 polarised directions are identical with institute making alive direction and uphold, and cause the bicrystal sheet to be bent upwards therefrom, thereby gas source nozzle 9 is closed, and blowdown nozzles 10 is opened, thereby reaches the purpose of adjusting gas circuit pressure size.If otherwise upper and lower piezo-electric sheet 1,2 adds opposite voltage, then upper and lower piezo-electric sheet 1,2 is bent downwardly and gas source nozzle 9 is opened, blowdown nozzles 10 is closed, and the feasible thus gas circuit that is made of outgassing nozzle 11, gas source nozzle 9, blowdown nozzles 10 is finished the function of inlet and outlet.

The utility model and the supporting use of Siemens's intelligent positioner can be converted into frequency signal with the current signal of outside input, and electric current is big more, frequency is high more, then in cycle time, piezoelectric bimorph body valve events number of times is many more, constantly controls inlet and outlet, thereby can control gas circuit pressure.

Claims

1, a kind of piezoelectric bimorph body valve, it is characterized in that having a pair of loam cake that is tightly connected (3) and the lower cover of making by insulating material (5), end in loam cake (3) and lower cover (5) is crimped with unequal-sided " U " shape elastic electrode sheet (1), " U " shape gap of elastic electrode sheet (1) accompanies the last piezo-electric sheet (4) and the lower piezoelectric sheet (8) of being separated by by a conduction interlayer (7), three's one end is fixed, and the other end is unsettled; The position, long limit that loam cake (3) is gone up corresponding to " U " shape elastic electrode sheet is provided with an electrode (2), lower cover (5) go up the minor face afterbody of it " U " shape elastic electrode (1) of lower piezoelectric sheet (8) with it electrical isolation be provided with another electrode (6), electrode (6) electrical isolation is passed lower piezoelectric sheet (8) and is electrically connected with conduction interlayer (7); Be provided with outgassing nozzle (11) at loam cake (3) middle part, corresponding on be provided with gas source nozzle (9) on the loam cake (3) on the free end of piezo-electric sheet (4); Lower cover (5) corresponding to lower piezoelectric sheet (8) free end below is provided with a blowdown nozzles (10).