CN109201360B - Double-order high-pressure water jet self-vibration nozzle device - Google Patents

Abstract

The invention provides a dual-stage high-pressure water jet self-vibration nozzle device, and belongs to the technical field of industrial cleaning. The device comprises an inlet shrinkage tube, a first-order resonant cavity, a second-order resonant cavity, a water outlet spray sheet and the like, wherein the inlet shrinkage tube and the water outlet spray sheet are respectively fixed at the upper end of the first-order resonant cavity and the lower end of the second-order resonant cavity, and the inlet shrinkage tube and the second-order resonant cavity are connected in series to form a double-order resonant cavity, so that the natural frequency of acoustic resonance of the resonant cavity is enriched, and the self-adaptive adjustment of an oscillation mode is realized when the working condition is changed, so that strong self-excited oscillation can be generated in a large range; in addition, the outlet spray sheet is formed by nesting different materials, so that the jet stability can be greatly improved, and the service life of the nozzle can be prolonged. The combination of the strong self-vibration effect of the double-stage nozzle and the long-service-life spray sheet greatly widens the working field of the self-vibration jet flow and the continuous operation time.

Description

A two-stage high-pressure water jet self-oscillating nozzle device

Technical field

The invention relates to the technical field of industrial cleaning, and in particular to a double-stage high-pressure water jet self-oscillating nozzle device.

Background technique

Since the self-oscillating jet has the advantages of pulse jet and cavitation jet, it can produce strong erosion and greatly improve the jet working efficiency, and has received widespread attention. It has been successfully used in oil drilling, deep sea resource extraction, drilling platform and ship cleaning and other fields.

The self-resonating nozzle device is the core of the self-resonating jet generation. Its resonant cavity size and outlet structure directly determine the working effect of the jet. The premise for a self-oscillating nozzle to produce a strong self-oscillating jet is that the acoustic harmonic natural frequency of the resonant cavity is consistent with the shedding frequency of the jet vortex ring. At this time, the cavitation and water hammer effects are most obvious. However, in the actual application process, the shedding frequency of the jet vortex ring changes in real time with the jet flow velocity, environmental confining pressure and other factors. Moreover, the acoustic harmonic natural frequency of the resonator is single and the parameter adjustment is difficult, making it difficult for the two to match each other in real time, making it impossible to change the time-varying frequency. Under working conditions, it can efficiently generate a self-oscillating jet with strong oscillation. For this reason, it is particularly important to design a self-oscillating jet nozzle transposition with multiple acoustic harmonic natural frequencies and a wide operating range.

This research group has obtained a relevant national authorized patent (ZL2014100030975.9), which is a high-pressure water jet self-oscillating nozzle device (hereinafter referred to as the "original invention"). The original invention can produce a self-oscillating jet with strong oscillation effect, and Detect high-frequency oscillation effects through pipeline pressure signals. However, the resonant cavity of the original invention is composed of a first-order mode and uses carbide spray blades, which has problems such as a narrow working range of the jet oscillation peak, the inability to realize adaptive adjustment under different working conditions, and a short spray blade life. The present invention has the following differences from the original invention: (1) The present invention uses a second-order resonant cavity, which expands the frequency band of the resonant cavity's acoustic harmonic frequency, thereby greatly increasing the dynamic response range of the jet to the self-excited frequency, and realizing the response to different working conditions. Adaptive. (2) Different resonant cavities are connected in series, which increases the jet oscillation mode and improves the oscillation intensity. (3) The present invention makes an innovative design of the spray blade structure, and nests polycrystalline diamond on the basis of the original carbide, which greatly improves the spray blade life and continuous working time.

Contents of the invention

The technical problem to be solved by the present invention is to provide a double-stage high-pressure water jet self-oscillation nozzle device. By increasing the order of the resonant cavity, it has a multi-order acoustic resonance natural frequency and realizes the self-oscillation mode of the jet under a wide range of working conditions. The adaptive adjustment greatly increases the working range of the nozzle and the generated jet; at the same time, polycrystalline diamond is embedded at the outlet spray blade, which improves the stability of the jet and extends the service life and continuous working time of the nozzle. The invention provides guarantee for jet modulation and obtaining the best self-oscillation effect under different confining pressures and changing working conditions, and also lays a foundation for further expanding the application range of self-oscillation jets.

The device includes an inlet shrink tube, a first-order resonant cavity, a second-order resonant cavity, an outlet spray plate, a supporting base and a connecting sleeve. The inlet shrink tube is fixed on the upper end of the first-order resonant cavity, and the outlet spray plate is fixed on the second-order resonant cavity. At the lower end of the first-order resonant cavity, the support base is located at the bottom of the device, and the connecting sleeve wraps the first-order resonant cavity and the second-order resonant cavity.

Among them, the first-order resonant cavity is hollow cylindrical, the front part of the inlet shrink tube is provided with threads to connect to the water inlet pipeline, and the rear part of the inlet shrink tube is connected to the first-order resonant cavity.

The second-order resonant cavity is hollow cylindrical. The lower part of the first-order resonant cavity is connected to the upper part of the second-order resonant cavity. There is a water outlet in the middle of the water outlet spray plate, and the water outlet is placed at the bottom of the second-order resonant cavity.

The inlet shrink tube is fixed to one end of the first-order resonant cavity through external threads and connecting sleeves. The first-order resonant cavity is located in the connecting sleeve. The outlet spray plate is fixed to the second-order resonant cavity through external threads and connecting sleeves on the support base. the other end of the body.

The inlet shrink tube, the first-order resonant cavity, the second-order resonant cavity and the outlet spray plate are connected in series to form a resonant cavity.

There is a groove at the upper end of the first-order resonant cavity, and an O-shaped rubber seal ring is placed inside the groove to cooperate with the inlet shrink tube for sealing; there is a groove at the upper end of the second-order resonant cavity, and inside the groove There are two O-shaped rubber sealing rings in the ring to cooperate with the first-order resonant cavity for sealing; there is a groove at the connection surface between the second-order resonant cavity and the water outlet spray plate, and there are three O-shaped rubber sealing rings in the groove for cooperative sealing.

Since the self-oscillating jet has strong cavitation and high-frequency self-oscillation, its working conditions are also very harsh. Therefore, the outlet spray plate is made of a cemented carbide matrix and a polycrystalline diamond inner hole nested in it.

The inner diameters of the inlet shrink tube, the first-order resonant cavity, and the second-order resonant cavity are reduced in sequence according to a certain proportion.

The beneficial effects of the above technical solutions of the present invention are as follows:

The invention provides a self-vibrating jet nozzle with multiple acoustically harmonic natural frequencies, realizes the adaptive adjustment of the self-vibrating frequency of the self-vibrating jet under different working conditions, expands the parameter adjustment range of the self-vibrating nozzle, and improves the efficiency of the self-vibrating jet. The working range of a single nozzle; at the same time, the use of a water outlet spray plate nested with polycrystalline diamond greatly improves the service life of the nozzle, extends the continuous working time of the nozzle and reduces the working cost, laying the foundation for the further promotion and application of self-oscillating jets foundation.

Description of the drawings

Figure 1 is a schematic structural diagram of the double-stage high-pressure water jet self-oscillating nozzle device of the present invention;

Figure 2 shows the comparison of changes in oscillation intensity between single-stage nozzles and double-stage nozzles under different working conditions;

Figure 3 shows the pressure oscillation spectrum diagrams of single-stage nozzles and double-stage nozzles under a certain working condition, where (a) is a double-stage nozzle and (b) is a single-stage nozzle.

Among them: 1-inlet shrink tube; 2-first-order resonant cavity; 3-second-order resonant cavity; 4-outlet spray plate; 5-support base; 6-connecting sleeve; 7-O-shaped rubber sealing ring ; 8-O-shaped rubber sealing ring two; 9-O-shaped rubber sealing ring three.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

The invention provides a double-stage high-pressure water jet self-oscillating nozzle device.

As shown in Figure 1, the device includes an inlet shrink tube 1, a first-order resonant cavity 2, a second-order resonant cavity 3, an outlet spray plate 4, a support base 5 and a connecting sleeve 6. The inlet shrink tube 1 is fixed on a The upper end of the first-order resonant cavity 2, the water outlet spray plate 4 is fixed on the lower end of the second-order resonant cavity 3, the supporting base 5 is located at the bottom of the device, and the connecting sleeve 6 wraps the first-order resonant cavity 2 and the second-order resonant cavity 3.

Among them, the first-order resonant cavity 2 is hollow cylindrical, the front part of the inlet shrink tube 1 is provided with threads to connect to the water inlet pipeline, and the rear part of the inlet shrink tube 1 is connected to the first-order resonant cavity 2.

The second-order resonant cavity 3 is a hollow cylinder. The lower part of the first-order resonant cavity 2 is connected to the upper part of the second-order resonant cavity 3. There is a water outlet in the middle of the water outlet spray plate 4, and the water outlet is placed at the bottom of the second-order resonant cavity 3. .

The inlet shrink tube 1 is fixed at one end of the first-order resonant cavity 2 through external threads and the connecting sleeve 6. The first-order resonant cavity 2 is located in the connecting sleeve 6. The outlet spray plate 4 is connected through the external threads and the supporting base 5 The sleeve 6 is fixed at the other end of the second-order resonant cavity 3 .

The inlet shrink tube 1, the first-order resonant cavity 2, the second-order resonant cavity 3 and the water outlet spray plate 4 are connected in series to form a resonant cavity.

There is a groove at the upper end of the first-order resonant cavity 2, and an O-shaped rubber seal ring 7 is placed inside the groove to cooperate with the inlet shrink tube 1 for sealing; there is a groove at the upper end of the second-order resonant cavity 3 , an O-shaped rubber seal ring 28 is placed in the groove to cooperate with the first-order resonant cavity 2 for sealing; a groove is provided at the connection surface between the second-order resonant cavity 3 and the water outlet spray plate 4, and an O-shaped ring is provided in the groove. The rubber sealing ring three 9 cooperates with the seal.

In the design, the water outlet spray plate 4 is made of a cemented carbide matrix and a polycrystalline diamond inner hole nested in it.

It will be described below with reference to specific embodiments.

In this device, the second-order resonant cavity composed of the inlet shrink tube, the first-order resonant cavity, the second-order resonant cavity, and the outlet spray plate are connected in series. Each of the second-order resonant cavities has three different resonant frequencies in the first-order resonant mode, corresponding to The cavity lengths are L1, L2 and L1+L2 respectively, and the resonant frequencies are more abundant in high-order modes. Therefore, when the working conditions change and the self-excited frequency changes, the self-resonant jet can adaptively select a close self-resonant frequency to achieve a strong peak resonance state.

The working principle of the device is as follows: the high-pressure water provided by the working system is connected to the nozzle device through the high-pressure pipeline and enters through the inlet shrink tube 1. The high-pressure water flow enters the resonant cavity composed of the first-order resonant cavity 2 and the second-order resonant cavity 3. After the water outlet spray plate 4 shrinks in section, a self-oscillating jet is formed and is ejected from the water outlet of the water outlet spray plate 4 . Furthermore, when the ambient confining pressure and the incoming flow pressure change, the self-excited frequency changes accordingly, and the resonant cavity can adaptively select and amplify the self-excited frequency.

Figure 2 shows the root mean square values of pressure oscillation under different cavitation numbers for a single-stage nozzle with a resonant cavity length of L1 and a double-stage nozzle with a resonant cavity length of L1+L2 under the same incoming flow conditions. It can be seen from the figure that the double-stage nozzle has a higher pressure oscillation amplitude in a wider cavitation number range than the single-stage nozzle.

Figure 3 is the self-oscillating jet pressure oscillation spectrum diagram of different nozzles under the condition of cavitation number 0.08 in Figure 2. (a) is a double-stage nozzle, (b) is a single-stage nozzle. There are two in Figure 3(a) The resonance peak and amplitude are higher than those in Figure 3(b). It can be seen from the comparison that compared with the single-stage nozzle, the double-stage nozzle has multi-order acoustic harmonic natural frequencies and can selectively amplify different ranges of self-excited frequencies.

The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (3)

1. A two-stage high-pressure water jet self-oscillating nozzle device, characterized by: including an inlet shrink tube (1), a first-order resonant cavity (2), a second-order resonant cavity (3), and an outlet spray plate (4 ), support base (5) and connecting sleeve (6), the inlet shrink tube (1) is fixed on the upper end of the first-order resonant cavity (2), and the outlet spray plate (4) is fixed on the second-order resonant cavity (3) At the lower end, the support base (5) is located at the bottom of the device, and the connecting sleeve (6) wraps the first-order resonant cavity (2) and the second-order resonant cavity (3); the first-order resonant cavity (2) is a hollow cylindrical shape , the front part of the inlet shrink tube (1) is provided with a thread to connect to the water inlet pipe, and the rear part of the inlet shrink tube (1) is connected to the first-order resonant cavity (2); The second-order resonant cavity (3) is in the shape of a hollow cylinder. The lower part of the first-order resonant cavity (2) is connected to the upper part of the second-order resonant cavity (3). There is a water outlet in the middle of the water outlet spray plate (4). The nozzle is placed at the bottom of the second-order resonant cavity (3); The inlet shrink tube (1) is fixed at one end of the first-order resonant cavity (2) through an external thread and a connecting sleeve (6). The first-order resonant cavity (2) is located in the connecting sleeve (6), and the water outlet The spray plate (4) is fixed on the other end of the second-order resonant cavity (3) through the external thread of the support base (5) and the connecting sleeve (6); The inlet shrink tube (1), first-order resonant cavity (2), second-order resonant cavity (3) and outlet spray plate (4) are connected in series to form a resonant cavity; The inner diameters of the inlet shrink tube (1), the first-order resonant cavity (2), and the second-order resonant cavity (3) decrease in sequence. 2. The double-stage high-pressure water jet self-oscillating nozzle device according to claim 1, characterized in that: a groove is provided at the upper end of the first-order resonant cavity (2), and an O-shaped ring is placed inside the groove. The rubber sealing ring one (7) cooperates with the inlet shrink tube (1) for sealing; there is a groove at the upper end of the second-order resonant cavity (3), and an O-shaped rubber sealing ring two (8) and two are placed inside the groove. The first-order resonant cavity (2) cooperates and seals; the second-order resonant cavity (3) and the water outlet spray plate (4) are provided with a groove at the connection surface, and three O-shaped rubber sealing rings (9) are provided in the groove to cooperate. seal. 3. The double-stage high-pressure water jet self-oscillating nozzle device according to claim 1, characterized in that: the water outlet spray piece (4) is made of a cemented carbide matrix and a polycrystalline diamond inner hole nested therein.