CN200989293Y - Micro water spraying propulsion pump - Google Patents

Abstract

The utility model relates to a miniature water jet propulsion pump which can be applied to underwater or surface miniature aircraft, and is especially suitable for special fields subject to serious electromagnetic interference. Its purpose is designed to overcome the shortcomings of existing propulsion pumps that are difficult to realize miniaturization and the shortcomings of traditional piezoelectric pumps with valves, such as small flow rate and low flow rate. The specific technical solution is: the propulsion pump is composed of a pump body, a pump chamber, and a piezoelectric vibrator, with the piezoelectric vibrator (4) as the driving element, and the piezoelectric vibrator (4) is supported on the pump body (9) by its surrounding elastic elements. In the cavity formed between the cover (6), the pump body (9) is provided with an inlet flow channel and an outlet flow channel. The rubber stop valve is used as the inlet valve, and the outlet is the spout (8). There is no valve at the spout (8), and it is normally connected to the outside world. The pump cavity composed of the pump cavity, the valve cavity and the spout is an unclosed cavity. .

Description

Mini water jet propulsion pump

technical field

The utility model is applied to the propulsion device of the underwater or water surface micro-vehicle, and is especially suitable for the special driving field subject to severe electromagnetic interference.

Background technique

The water jet propulsion uses the reaction force of the water sprayed by the propulsion pump as the power. In terms of maneuverability, the water jet propulsion has the advantages of low operating noise, suitable for shallow water navigation, small attached body resistance, simple transmission shaft system, good protection performance and variable work. The advantages of a wide range of conditions. It can change the direction of propulsion by changing the direction of the nozzle, and guide the water flow to reverse spray through the cooperation of the steering device to achieve deceleration and reversing. At present, domestic and foreign waterjet propellers generally use axial-flow pumps or mixed-flow pumps, and their efficiency has reached 85% to 90%, but their large volume limits the miniaturization of underwater vehicles. There is a bigger breakthrough in performance, and a kind of novel miniature water jet propeller must be developed.

Ordinary piezoelectric pump is a kind of miniature fluid conveying device made by using the principle of inverse piezoelectric effect. The so-called inverse piezoelectric effect is that when an electric field is applied to the piezoelectric body, the crystal not only produces polarization, but also produces strain and stress. This phenomenon of strain or stress generated by the electric field is called the inverse piezoelectric effect. If an alternating excitation electric field is given to the piezoelectric disc vibrator, the piezoelectric vibrator will expand or contract in the radial direction, that is, reciprocating vibration will occur. Through the integration of piezoelectric pump technology and water jet propulsion technology, a new type of micro water jet propulsion pump——piezoelectric reverse thrust jet pump was developed.

Piezoelectric pumps are generally divided into two categories: valveless and valved. The output flow rate of the existing valveless piezoelectric pump is small, so it is not suitable for the use of the propulsion pump. The valved piezoelectric pump uses the radial bending deformation of the piezoelectric vibrator to change the volume of the inner cavity of the pump body, thereby changing the internal pressure and forcing the valve to open or close. Fig. 4 is a schematic structural diagram of a conventional valved piezoelectric pump. Among them, 9 is the pump body, 4 is the piezoelectric vibrator, 3 is the pump cavity, 15 and 16 are the inlet valve and the outlet valve respectively. Its working principle is: the pump body 1, the piezoelectric vibrator 4, the inlet valve 15 and the outlet valve 16 form a closed cavity, and an alternating electric signal is applied to the piezoelectric vibrator 4, and the piezoelectric vibrator 4 produces reciprocating radial bending deformation. In this way, the pressure in the closed cavity changes. During the suction process, the pressure in the pump decreases, and the pressure outside the pump is greater than the pressure inside the pump. Under the action of the internal and external pressure difference, the inlet valve 15 is opened and the outlet valve 16 is closed. During the discharge process, the pressure inside the pump increases, and the pressure inside the pump is greater than the pressure outside the pump. Under the action of the pressure difference between the inside and outside, the inlet valve 15 is closed and the outlet valve 16 is opened. Under the periodic change of the piezoelectric vibrator 4, the inlet and outlet valves 15, 16 are periodically opened and closed, and the fluid in the pump body forms a one-way flow. Affected by the inlet flow area and the hysteresis of the pump valve, the liquid cannot fill the inner cavity of the pump in each cycle, which affects the output flow of the pump. And due to the existence of the outlet valve, the outflow resistance of the fluid is greatly improved, and the outflow speed and flow rate of the fluid are very greatly restricted. The most important thing for a propulsion pump is to require a large flow rate injection and a high flow rate, which cannot be satisfied by a traditional piezoelectric pump with a valve. In addition, the inlet and outlet structure arrangement of traditional piezoelectric pumps with valves is not suitable as a propulsion pump.

Contents of the invention

The purpose of the utility model is to provide a novel combination of piezoelectric pump technology and The miniature water jet propulsion pump of water jet propulsion technology, that is, the piezoelectric reverse thrust jet pump.

The above-mentioned purpose of the utility model is achieved in that, in conjunction with accompanying drawing, description is as follows:

A miniature water jet propulsion pump is composed of a pump body, a pump cavity, and a piezoelectric vibrator. The piezoelectric vibrator 4 is used as a driving element. The piezoelectric vibrator 4 is supported between the pump body 9 and the cover 6 by elastic elements around it. In the chamber, the pump body 9 is provided with an inlet flow channel and an outlet flow channel. The axis of the valve cavity corresponding to the inlet flow channel and the axis of the outlet flow channel are on the same plane and perpendicular to each other. A rubber stop valve is used as the inlet valve at the inlet, and the outlet is It is spout 8, and there is no valve at spout 8, and it is often connected with the outside world, and the pump inner cavity composed of pump cavity, valve cavity and spout is in an unsealed state.

Said inlet channel adopts two, one is the inlet A13, and the other is the inlet B11, the axis of the valve chamber A5 corresponding to the inlet A13 is parallel to the axis of the valve chamber B7 corresponding to the inlet B11 and placed directly below the pump chamber 3, the two The axis of the valve chamber and the axis of the spout 8 are in the same plane, and both are perpendicular to the axis of the spout.

The valve chamber A5 corresponding to the inlet A13 and the valve chamber B7 corresponding to the inlet B11 are arranged in a stepped shape, and one of the larger valve chambers B7 directly communicates with the nozzle 8, and the inner surface of the outlet channel is connected to the base plane of the valve chamber Tangent.

Said rubber shut-off valve is an integral open valve, its spool is fixed, its periphery is fully opened, and its longitudinal section is umbrella-shaped.

The beneficial effect of the utility model is that the compact piezoelectric element is both a prime mover and a working machine, and has the characteristics of large output jet flow per unit volume, high energy density, no electromagnetic interference, good controllability, and greater propulsion. Can be well integrated with underwater vehicles. Moreover, the simple control of multiple degrees of freedom of the underwater vehicle can be realized through the combination of multiple pumps, and it can be applied to special fields subject to serious electromagnetic interference.

Description of drawings

Fig. 1 is a structural main sectional view of the present utility model;

Fig. 2 is the A-A sectional view of Fig. 2;

Fig. 3 is the B direction diagram of Fig. 2;

Fig. 4 is a main cross-sectional view of the structure of a conventional valved piezoelectric pump.

In the figure: 1. Seal ring, 2. Upper support seal ring, 3. Pump chamber, 4. Piezoelectric vibrator, 5. Valve chamber A, 6. Cover, 7. Valve chamber B, 8. Nozzle, 9. Pump Body, 10. rubber stop valve B, 11. inlet B, 12. rubber stop valve A, 13. inlet A, 14. lower support seal ring, 15. is the inlet valve, 16 outlet valve.

Detailed ways

Below in conjunction with the embodiment shown in the accompanying drawings, the specific content and working principle of the present utility model will be further described.

Miniature water jet propulsion pump-piezoelectric reverse thrust jet flow pump is made by using the principle of inverse piezoelectric effect. The pump inner cavity of the propulsion pump is in an unsealed state, and is directly communicated with the outside world through the nozzle 8 . Its working principle is: when an alternating electric signal is applied to the piezoelectric vibrator 4, the piezoelectric vibrator 4 produces reciprocating radial bending deformation. Although the cavity of the propulsion pump is not closed, since the propulsion pump works in water, when the water fills the entire cavity, the cavity is equivalent to a closed state, and any pressure change in the cavity can cause the valve plate to on or off. Therefore, when an alternating electric signal is applied to the piezoelectric vibrator 4, the piezoelectric vibrator 4 undergoes reciprocating radial bending deformation, thus changing the pressure in the closed cavity. During the suction process, the pressure inside the pump decreases, and the pressure outside the pump is greater than the pressure inside the pump. Under the action of the pressure difference between the inside and outside, the inlet valve is opened, and the fluid flows into the pump from the nozzle and the inlet at the same time. During the discharge process, the pressure inside the pump increases, and the pressure inside the pump is greater than the pressure outside the pump. Under the action of the pressure difference between the inside and outside, the inlet valve is closed, and the fluid is only discharged from the pump body through a single outlet, that is, the nozzle. Under the periodic action of the piezoelectric vibrator, the fluid forms a one-way jetting motion.

The propulsion pump consists of five parts: cover 6, pump body 9, piezoelectric vibrator 4, sealing ring 1 and rubber stop valves A and B. The upper and lower sides of the periphery of the piezoelectric vibrator 4 pass through the elastic support elements, namely the upper support seal ring 2 and the lower support seal ring 14, which can effectively increase the volume change of the pump body. Since it will be used underwater, in order to improve the sealing performance of the system, a sealing ring 1 is added around the periphery of the piezoelectric vibrator 4 . These sealing rings are all arranged in the grooves of the pump body 9 and the cover 6 . The pump body 9 is composed of four parts: the pump chamber 3, the valve chamber A5 and the valve chamber B7, the outlet flow channel nozzle 8, the inlet A13 and the inlet B11. There are two valve chambers and inlets, and the two valve chambers are parallel and placed in the pump chamber. 3 directly below, and the axes of the two valve chambers A5, B7 are in the same plane as the axis of the spout 8, and both are perpendicular to the axis of the spout; the valve chambers are facing the entrance and are arranged on the same axis. The volume of the valve cavity A5 far from the spout 8 is small, just enough to place a rubber stop valve A12, the height of the valve cavity A5 is equal to the thickness of the valve body after installation, that is, the thickness of the valve plate; the volume of the valve cavity connected with the spout is large, and its height can be adjusted. Refer to the following formula to determine:

h _g +Φ _j +h _v -h _p +2≥H≥h _g +Φ _j +h _v -h _p +1

In the formula, H, h _g , Φ _j , h _v and h _p are the height of the valve cavity B7, the depth of the groove, the diameter of the spout 8, the height of the valve body 9 and the height of the pump cavity 3, respectively.

There is a rubber stop valve between the inlet and the valve cavity, that is, the inlet valve: rubber stop valve A12 and rubber stop valve B10. There is no valve at the outlet, that is, the nozzle 8, and the inner surface of the outlet flow channel is tangent to the base surface of the connected valve cavity B7. , so that the layout can effectively improve the outlet flow velocity and jet flow. The double inlet structure minimizes the volume of the pump body, which can further improve its self-priming capacity and spray flow.

In FIG. 2 , the piezoelectric vibrator 4 is supported by the upper support seal ring 2 and the lower support seal ring 14 , and is placed directly above the pump chamber 3 . The cover 6 has an annular groove for inlaying the upper support sealing ring 2 and the sealing ring 1 .

The pump body 9 is composed of a pump chamber 3 , a valve chamber A5 , a valve chamber B7 , an inlet A13 , an inlet B11 and a spout 8 .

The inlet A13 and the inlet B11 face the valve cavity A5 and the valve cavity B7 respectively, and their axis lines are respectively perpendicular to the axis line of the spout 8 and are in the same plane. The valve cavity A5 and the valve cavity B7 are arranged in steps, and the valve cavity B7 is connected with the nozzle 8 . The rubber stop valve A12 and the rubber stop valve B10 are inlet valves, which are respectively fixed directly above the inlet A13 and the inlet B11, and the periphery of the valve plate is just in contact with the base of the valve chamber. There are no valve plates at 8 outlets, that is, the nozzles, which can effectively reduce the resistance of the nozzles and improve the injection performance. Similarly, grooves are provided in the pump body for inlaying the lower support sealing ring 14 and the sealing ring 1 .

Claims (4)

1, a kind of miniature water jet propulsion pump is by the pump housing, pump chamber, piezoelectric vibrator is formed, it is characterized in that with piezoelectric vibrator (4) be driving element, piezoelectric vibrator (4) is supported in the cavity that constitutes between the pump housing (9) and the capping (6) by its peripheral elastic element, the pump housing (9) is provided with entrance channel and outlet flow, the valve pocket axis of entrance channel correspondence is in same plane and vertical mutually with the outlet flow axis, the ingress adopts the rubber stop valve as inlet valve, outlet promptly is spout (8), spout (8) locates not establish valve, with extraneous normal open, by pump chamber, the pump inner chamber body that valve pocket and spout are formed is sealed cavity not.

2, miniature water jet propulsion pump according to claim 1, it is characterized in that said entrance channel adopts two, one is inlet A (13), another is inlet B (11), valve pocket B (7) parallel axes that valve pocket A (5) axis that inlet A (13) is corresponding is corresponding with the B (11) that enters the mouth and place pump chamber (3) under, the axis of the axis of two valve pockets and spout (8) is in same plane, and all perpendicular with the spout axis.

3, miniature water jet propulsion pump according to claim 1 and 2, it is characterized in that the corresponding valve pocket A (5) of said inlet A (13) the valve pocket B (7) corresponding with inlet B (11) presents stepped arrangement, one of them highly bigger valve pocket B (7) directly communicates with spout (8), and the coupled valve pocket base plane of outlet flow internal surface is tangent.

4, miniature water jet propulsion pump according to claim 1 is characterized in that said rubber stop valve is whole open valve, and its spool is fixed, peripheral full open, and longitudinal section is a umbrella.

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