CN103671301B - A kind of mechanical small-displacement pressure transducer - Google Patents

Abstract

A mechanical small-displacement pressure transducer: including a main cavity, a secondary cavity, a dowel rod and a corrugated membrane assembled together, the main cavity is a shallow cylinder, and a protruding force platform is provided in the middle of the bottom of the cylinder , there is a blind hole in the middle of the bottom of the cylinder as a small guide hole for the dowel rod, and there are axial through holes for locking bolts and radial oil inlet screw holes and oil outlet screw holes on the cylinder wall, and an annular seal is opened at the cylinder mouth Groove; the auxiliary cavity is shallow cylindrical, with a through hole in the middle of the bottom of the cylinder as a large guide hole for the dowel rod and a spring groove arranged in a ring, a through hole for locking bolts is also opened on the cylinder wall, and an annular seal is also opened at the cylinder mouth Groove; the dowel rod is a rod with two diameters, the corrugated film has a hole in the middle corresponding to the small diameter rod, and there are small holes evenly distributed around it corresponding to the through hole for the locking bolt; the small diameter of the dowel rod passes through the middle hole of the corrugated film and is inserted into the small The guide hole and the corrugated film are fixed on the inner end surface of the large-diameter rod by bolts, and the main cavity and the secondary cavity clamp the dowel bar and the corrugated film in the middle and connect them together with bolts.

Description

A Mechanical Small Displacement Pressure Transducer

technical field

The invention relates to a mechanical small displacement pressure converter.

Background technique

At present, most of the devices that convert pressure into mechanical pressure on the market use movable piston hydraulic cylinders. The working principle of this device is: by adjusting the pressure difference between the cylinders on both sides of the piston, the piston will It moves under oil lubrication. If the dowel rod of the piston is subjected to a mechanical pressure, a corresponding pressure difference will be generated on both sides of the piston, and the mechanical pressure will be maintained by this difference. Since the generation of mechanical pressure is accompanied by the movement of the piston and the dowel rod connected to it, finishing machining is required in the production, and the sealing problem at the dowel rod must be considered, and the production cost and manufacturing process are very high.

As for the adjustable oil pressure loading system of the bearing simulation test bench of the axial pumped storage hydraulic unit, its displacement is very small (no more than 5mm), but it is required that there should be no oil leakage.

Contents of the invention

The technical problem to be solved by the present invention is to provide a mechanical small-displacement pressure transducer with no oil leakage, simple manufacture and low cost.

To solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A mechanical small-displacement pressure transducer, characterized in that it includes a main cavity, a secondary cavity, a dowel and a corrugated membrane assembled together, the main cavity is in the shape of a shallow cylinder, and the bottom of the cylinder is set in the middle There is a protruding force platform, a blind hole is opened in the middle of the bottom of the cylinder as a small guide hole for the dowel rod, and there are axial through holes for locking bolts and radial oil inlet screw holes and oil outlet screw holes on the cylinder wall. There is an annular sealing groove at the mouth of the barrel; the auxiliary cavity is shallow cylindrical, and a through hole is opened in the middle of the bottom of the barrel as a large guide hole for the dowel rod and a spring groove is arranged in a ring, and a locking bolt is also opened on the barrel wall. With a through hole, the cylinder mouth is also provided with an annular sealing groove; the dowel rod is a rod with two diameters, the small diameter end corresponds to the small guide hole of the main cavity, the large diameter end corresponds to the large guide hole of the auxiliary cavity, and the large diameter rod An annular sealing groove is arranged on the inner end surface of the inner end, and a convex ring is arranged near the inner end to form a corrugated film protection disk. The inner end of the small-diameter rod has a corrugated film locking thread; the middle of the corrugated film has a hole corresponding to the small-diameter rod. , there are small holes evenly distributed around it corresponding to the through holes for locking bolts; the small diameter of the dowel rod passes through the middle hole of the corrugated membrane and then inserted into the small guide hole, and the corrugated membrane is fixed on the inner end surface of the large diameter rod by bolts, the main The cavity and the sub-cavity sandwich the dowel rod and the corrugated membrane and connect them together with bolts.

Beneficial effects: the invention utilizes the effective elastic deformation of the corrugated membrane to convert pressure into a device that does not take or only takes a small amount of flow and has no leakage, and is suitable for converting fluid pressure into mechanical pressure with small displacement. A conversion device is a purely mechanical small displacement pressure converter.

The present invention is applied to the adjustable oil pressure loading system of the self-designed vertical shaft pumped storage hydraulic unit bearing simulation test bench. By adjusting the pressure of the oil inlet, the purpose of changing the pressure of the loader can be achieved. The device that converts pressure into small displacement pressure, which is cheap, high-quality and has no leakage, has a good application prospect and promotion value.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the structure of the present invention;

Fig. 2 is a schematic diagram of the structure of the main cavity of the present invention;

Fig. 3 is the schematic diagram of the sub-cavity structure of the present invention;

Fig. 4 is the structure diagram of dowel bar of the present invention;

Fig. 5 is a schematic diagram of the structure of the corrugated membrane of the present invention.

Reference signs: 1-force platform, 2-lock screw hole, 3-small guide hole of dowel rod, 4-oil inlet screw hole, 5-seal groove, 6-pressure oil chamber, 7-oil outlet screw hole , 8-Auxiliary cavity air cavity, 9-Auxiliary cavity sealing groove, 10-Auxiliary cavity spring groove, 11-Auxiliary cavity dowel rod guide hole, 12-Auxiliary cavity locking screw hole, 13-Force transmission Rod upper guide shaft, 14-corrugated film locking thread, 15-dowel rod sealing groove, 16-dowel rod corrugated film protection disc, 17-dowel rod lower guide shaft, 18 corrugated film lock nut.

Detailed ways

Referring to Figures 1 to 4, the embodiment of the mechanical small displacement pressure transducer of the present invention includes a main cavity, a secondary cavity, a dowel and a corrugated membrane assembled together, the main cavity is shallow cylindrical, and the bottom of the tube is There is a protruding force platform 1 in the middle of the outside, a blind hole is opened in the middle of the bottom of the cylinder as a small guide hole 3 for the dowel rod, and there are axial through holes 2 for locking bolts and radial oil inlet holes on the cylinder wall. The screw hole 4, the oil outlet screw hole 7, the barrel mouth is opened with an annular sealing groove 5; the auxiliary cavity is shallow cylindrical, and a through hole is opened in the middle of the bottom of the barrel as a large guide hole 11 for the dowel rod and a spring groove 10 is arranged in a ring. There is also a through hole 12 for locking bolts on the wall, and an annular sealing groove 9 is also opened on the cylinder mouth; the dowel rod is a rod with two diameters, the small diameter end corresponds to the small guide hole of the main cavity, and the large diameter end corresponds to the auxiliary cavity. Large guide hole, the inner end surface of the large-diameter rod is provided with an annular sealing groove 15, and a convex ring is provided near the inner end to form a corrugated film protection disc 16, and the inner end of the small-diameter rod has a corrugated film locking thread 14; the middle of the corrugated film There are holes corresponding to small-diameter rods, and small holes evenly distributed around correspond to through holes for locking bolts.

The small diameter of the dowel rod passes through the middle hole of the corrugated film and is inserted into the small guide hole. The corrugated film is fixed on the inner end surface of the large-diameter rod by bolts, and the main cavity and the auxiliary cavity sandwich the dowel bar and the corrugated film in the middle. Bolt together.

Working principle: See the attached figure, the pressure oil enters the pressure oil chamber 6 in the main chamber through the pressure oil pipe and the oil inlet screw hole 4 in the main chamber, and the air chamber 8 of the auxiliary chamber directly leads to the atmosphere. In this way, a pressure difference is generated on both sides of the corrugated membrane, and a pressure is generated on the corrugated membrane: the force is transmitted through the dowel rod. The dowel upper guide shaft 13 of the dowel is inserted into the dowel guide hole 3 of the main cavity, which is a blind end hole, and the motion damping coefficient of the dowel can be adjusted through the matching precision of their processing; The dowel lower guide shaft 17 of the dowel passes through the auxiliary cavity dowel guide hole 11 of the auxiliary cavity, which can control the direction of motion of the dowel; the auxiliary cavity spring groove 10 of the auxiliary cavity is equipped with a spring, When the dowel rod moves downward, it pushes against the dowel corrugated film protection disk 16 of the dowel rod to adjust the elastic coefficient of the dowel rod movement. Another purpose of the dowel corrugated film protection disc 16 is to protect the corrugated film so that it deforms as little as possible and produces as much pressure as possible.

Among them, the main cavity (Fig. 2) is a semi-cylindrical structure with an opening below which is processed by a complete ordinary steel, including a force platform 1, 12 locking screw holes 2 with a diameter of 8 mm, and a dowel guide. Hole 3, oil inlet screw hole 4, oil outlet screw hole 7, pressure oil seal groove 5 and pressure oil chamber 6; the auxiliary chamber (Figure 3) is a semi-cylindrical shape with an upper opening processed from a complete ordinary steel Structure, including auxiliary chamber air chamber 8, auxiliary chamber sealing groove 9, auxiliary chamber spring groove 10, auxiliary chamber dowel rod guide hole 11 and 12 auxiliary chamber locking screw holes 12 with a diameter of 8 mm; The dowel (Fig. 4) is processed from a complete piece of ordinary steel, including the dowel upper guide shaft 13, corrugated film locking thread 14, dowel sealing groove 15, dowel corrugated film protection disc 16. The lower guide shaft 17 of the dowel bar.

The above-mentioned dowel rod (Fig. 4) is inserted into the middle hole of the corrugated film (Fig. 5), and screwed on the corrugated film locking thread 14 of the dowel rod (Fig. 4) through the cushion and the corresponding nut, and the corrugated film The film (Fig. 5) is compressed, and the O-shaped sealing strip is embedded in the dowel sealing groove 15 of the dowel.

The above-mentioned main cavity (Fig. 2) and sub-cavity (Fig. 3) press the corrugated membrane tightly through 12 bolts with a diameter of 8 mm, and the pressure oil seal groove 5 in the main cavity and the sub-cavity in the sub-cavity O-shaped sealing strips are respectively embedded in the cavity sealing grooves 9 .

The dowel upper guide shaft 13 of the above-mentioned dowel is inserted into the dowel guide hole 3 of the main cavity; the dowel lower guide shaft 17 of the dowel passes through the auxiliary cavity dowel guide of the auxiliary cavity. Hole 11.

The oil inlet screw hole 4 in the above-mentioned main cavity is connected with the threaded oil inlet pipe to receive high-pressure oil; the oil outlet screw hole 7 is connected with the threaded oil outlet pipe and locked by a valve.

The above-mentioned corrugated membrane is made of high-elastic steel material and pressed at one time.

Claims (1)

1. A mechanical small-displacement pressure transducer, characterized in that it includes a main cavity, a secondary cavity, a dowel and a corrugated membrane assembled together, the main cavity is shallow cylindrical, and the bottom of the tube is outside There is a protruding force platform in the middle, a blind hole is opened in the middle of the bottom of the cylinder as a small guide hole for the dowel rod, and there are axial through holes for locking bolts and radial oil inlet screw holes and outlet holes on the cylinder wall. There is an oil screw hole, and there is an annular sealing groove at the mouth of the barrel; the auxiliary cavity is shallow cylindrical, and a through hole is opened in the middle of the bottom of the barrel as a large guide hole for the dowel rod and a spring groove is arranged in a ring, and a lock is also opened on the barrel wall. There is a through hole for tightening the bolt, and the cylinder mouth is also provided with an annular sealing groove; the dowel rod is a rod with two diameters, the small diameter end corresponds to the small guide hole of the main cavity, the large diameter end corresponds to the large guide hole of the auxiliary cavity, and the large diameter end corresponds to the large guide hole of the auxiliary cavity. The inner end surface of the diameter rod is provided with an annular sealing groove, and a protruding ring is provided near the inner end to form a corrugated film protection disk, and the inner end of the small diameter rod is provided with a corrugated film locking thread; the middle of the corrugated film has a hole corresponding to Small-diameter rods are evenly distributed with small holes corresponding to the through holes for locking bolts; the small diameter of the dowel rod passes through the middle hole of the corrugated film and is inserted into the small guide hole, and the corrugated film is fixed on the inner end surface of the large-diameter rod by bolts , the main cavity and the secondary cavity clamp the dowel rod and the corrugated membrane in the middle and connect them together with bolts.