CN209205570U - A kind of double rank high-pressure water jet self-vibration spray nozzle devices - Google Patents

Abstract

The utility model provides a double-stage high-pressure water jet self-vibrating nozzle device, which belongs to the technical field of industrial cleaning. The device includes an inlet shrink tube, a first-order resonant cavity, a second-order resonant cavity, and a water outlet nozzle. The inlet shrink tube and the water outlet nozzle are fixed on the upper end of the first-order resonant cavity and the lower end of the second-order resonant cavity, The double-stage resonant cavity composed of the inlet shrink tube and the two-stage resonant cavity in series enriches the acoustic harmonic natural frequency of the resonant cavity, and realizes the adaptive adjustment of the oscillation mode when the working condition changes, so that the strong self-excited oscillation can be In addition, the outlet nozzles are nested with different materials, which can greatly improve the stability of the jet flow and prolong the service life of the nozzle. The combination of the strong self-vibration effect of the double-stage nozzle and the long-life nozzle greatly expands the working field and continuous operation time of the self-vibration jet.

Description

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

technical field

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

Background technique

Due to the advantages of pulse jet and cavitation jet, the self-vibrating jet has attracted extensive attention due to its strong erosion effect and greatly improved jet efficiency, and has been successfully used in oil drilling, deep-sea resource extraction, drilling platforms and ship cleaning.

The self-oscillating nozzle device is the core of the self-oscillating jet, and its resonant cavity size and outlet structure directly determine the working effect of the jet. The premise of strong self-excited oscillating jet flow produced by the self-oscillating nozzle is that the acoustic harmonic natural frequency of the resonant cavity is consistent with the shedding frequency of the jet vortex ring, and the cavitation and water hammer effects are most obvious at this time. However, in the actual application process, the shedding frequency of the jet vortex ring changes in real time with factors such as jet flow velocity and environmental confining pressure, and the acoustic harmonic natural frequency of the resonator is single and the parameters are difficult to adjust, making it difficult for the two to match each other in real time, so that they cannot be time-varying. Under working conditions, it can efficiently generate a self-vibrating jet with strong oscillation. For this reason, it is particularly important to design a self-vibrating jet nozzle transposition with multiple acoustic harmonic natural frequencies and a wide working range.

Our research group has obtained one related national authorized patent (ZL2014100030975.9), which is a high-pressure water jet self-oscillating nozzle device (hereinafter referred to as "the original utility model"). The original utility model can produce a self-oscillating jet with a strong oscillation effect , and detect the high-frequency oscillation effect through the pipeline pressure signal. However, the resonant cavity of the original utility model is composed of a first-order mode, and the cemented carbide nozzle is used, so there are problems such as a narrow working range of the jet oscillation peak, inability to realize self-adaptive adjustment of different working conditions, and short life of the nozzle. The utility model has the following differences from the original utility model: (1) The utility model adopts a second-order resonant cavity, which expands the frequency band of the harmonic frequency of the resonant cavity, thereby greatly improving the dynamic response range of the jet to the self-excited frequency, and realizing different Adaptation to working conditions. (2) Different resonant cavities are connected in series, which increases the jet oscillation mode and improves the oscillation intensity. (3) The utility model has innovatively designed the nozzle structure, and nested polycrystalline diamond on the basis of the original hard alloy, so that the life of the nozzle and the continuous working time are greatly improved.

Utility model content

The technical problem to be solved by the utility model is to provide a double-stage high-pressure water jet self-vibration nozzle device, which has multi-order acoustic harmonic natural frequencies by increasing the order of the resonant cavity, so as to realize the self-vibration mode of the jet under wide working conditions. The self-adaptive adjustment of the state greatly improves the working range of the nozzle and the generated jet; at the same time, the polycrystalline diamond is nested at the exit nozzle, which improves the stability of the jet and prolongs the service life and continuous working time of the nozzle. The utility model provides a guarantee for jet flow modulation and obtaining the best self-vibration effect under different confining pressures and variable working conditions, and also lays a foundation for further expanding the application range of the self-vibration jet.

The device includes an inlet shrink tube, a first-order resonance cavity, a second-order resonance cavity, a water outlet nozzle, a support base and a connecting sleeve. The inlet shrink tube is fixed on the upper end of the first-order resonance cavity, and the water outlet nozzle is fixed on the second 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.

Wherein, the first-order resonant cavity is a hollow cylinder, the front part of the inlet shrink tube is provided with threads to connect with 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, and the middle part of the water outlet nozzle is provided with a water outlet, and the water outlet is placed at the bottom of the second-order resonant cavity.

The inlet shrink tube is fixed at one end of the first-order resonance cavity through the external thread and the connecting sleeve, the first-order resonance cavity is located in the connecting sleeve, and the outlet nozzle is fixed on the second-order resonance cavity through the external thread of the support base and the connecting sleeve the other end of the body.

The inlet shrink tube, the first-order resonant cavity, the second-order resonant cavity and the water outlet nozzle 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 sealing ring is placed in the inner ring of the groove to cooperate with the inlet shrink tube to seal; the upper end of the second-order resonant cavity is provided with a groove, and the groove is The ring is equipped with an O-shaped rubber sealing ring, which cooperates with the first-order resonant cavity to seal; there is a groove on the connection surface between the second-order resonant cavity and the spray plate of the water outlet, and an O-shaped rubber sealing ring is arranged in the groove to cooperate and seal.

Since the self-vibrating jet has strong cavitation and high-frequency self-excited oscillation, its own working conditions are also very harsh. Therefore, the water outlet nozzle is made of cemented carbide substrate and polycrystalline diamond inner hole nested.

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

The beneficial effects of the above-mentioned technical solution of the utility model are as follows:

The utility model provides a self-vibrating jet nozzle with multiple acoustic harmonic natural frequencies, which realizes self-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 working range of a single nozzle is improved; at the same time, the outlet nozzle embedded with polycrystalline diamond is used, which greatly improves the service life of the nozzle, prolongs the continuous working time of the nozzle and reduces the working cost, which is the further popularization and application of the self-vibrating jet. Foundation.

Description of drawings

Fig. 1 is the structural schematic diagram of the dual-stage high-pressure water jet self-oscillating nozzle device of the present invention;

Figure 2 is a comparison of the oscillation intensity of single-stage nozzles and double-stage nozzles under different working conditions;

Fig. 3 is a spectrum diagram of the pressure oscillation of a single-stage nozzle and a two-stage nozzle under a certain working condition, where (a) is a two-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-water outlet spray piece; 5-support base; 6-connecting sleeve; 7-O-shaped rubber sealing ring ; 8-O-shaped rubber seal ring two; 9-O-shaped rubber seal ring three.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, the following will describe in detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a double-stage high-pressure water jet self-vibrating nozzle device.

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

Wherein, the first-order resonant cavity 2 is a hollow cylinder, the front part of the inlet shrink tube 1 is provided with threads to connect with 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, and the middle part of the water outlet nozzle 4 is provided with a water outlet, 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 the external thread and the connecting sleeve 6, the first-order resonant cavity 2 is located in the connecting sleeve 6, and the outlet nozzle 4 is connected through the external thread of the support base 5 and The casing 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 nozzle 4 are connected in series to form a resonant cavity.

The upper end of the first-order resonant cavity 2 is provided with a groove, and the inner ring of the groove is equipped with an O-shaped rubber sealing ring 7 to cooperate with the inlet shrink tube 1; the upper end of the second-order resonant cavity 3 is provided with a groove , the inner ring of the groove is equipped with an O-shaped rubber sealing ring 2 8 to cooperate with the first-order resonant cavity 2 to seal; the second-order resonant cavity 3 is provided with a groove on the connection surface of the water outlet spray piece 4, and the groove is provided with an O Three 9-shaped rubber sealing rings are used for sealing.

In the design, the water outlet nozzle 4 is formed by nesting a cemented carbide substrate and a polycrystalline diamond inner hole.

The following will be described in conjunction with 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 water outlet nozzle in series 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 frequency is more abundant in high-order modes, so that when the working conditions change and the self-excited frequency changes, the self-resonating jet can adaptively select a similar natural frequency to achieve 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, enters through the inlet shrinkage tube 1, and the high-pressure water flow enters the resonance cavity composed of the first-order resonance cavity 2 and the second-order resonance cavity 3, After the water outlet spray sheet 4 shrinks the section, a self-vibrating jet is formed to be ejected from the water outlet of the water outlet spray sheet 4. Furthermore, when the environmental confining pressure and 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 value of pressure oscillation under different cavitation numbers for a single-stage nozzle with a resonant cavity length L1 and a double-stage nozzle with a resonant cavity length L1+L2 under the same incoming flow conditions. It can be seen from the figure that compared with the single-stage nozzle, the two-stage nozzle has a higher pressure oscillation amplitude in a wider cavitation number range.

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

The above is a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. And retouching should also be regarded as the protection scope of the present utility model.

Claims (8)

1. a kind of double rank high-pressure water jet self-vibration spray nozzle devices, it is characterised in that: including entrance collapsible tube (1), single order resonant cavity Body (2), second order resonant cavity (3), water outlet spray piece (4), backing seat (5) and connecting sleeve (6), entrance collapsible tube (1) are fixed In single order resonant cavity (2) upper end, water outlet spray piece (4) is fixed on second order resonant cavity (3) lower end, and backing seat (5) is located at dress Bottom set portion, connecting sleeve (6) wrap up single order resonant cavity (2) and second order resonant cavity (3).

2. double rank high-pressure water jet self-vibration spray nozzle devices according to claim 1, it is characterised in that: the single order resonant cavity Body (2) is hollow cylinder, and entrance collapsible tube (1) front is equipped with screw thread and is connected with inlet pipeline, entrance collapsible tube (1) rear portion It connects single order resonant cavity (2).

3. double rank high-pressure water jet self-vibration spray nozzle devices according to claim 1, it is characterised in that: the second order resonant cavity Body (3) is hollow cylinder, and single order resonant cavity (2) lower part is connected with second order resonant cavity (3) top, and water outlet sprays piece (4) Middle part is equipped with water outlet, and water outlet is placed in second order resonant cavity (3) bottom.

4. double rank high-pressure water jet self-vibration spray nozzle devices according to claim 1, it is characterised in that: the entrance collapsible tube (1) one end of single order resonant cavity (2) is fixed on by external screw thread and connecting sleeve (6), single order resonant cavity (2) is located at connection In casing (6), water outlet spray piece (4) is fixed on second order resonant cavity by the external screw thread and connecting sleeve (6) of backing seat (5) (3) the other end.

5. double rank high-pressure water jet self-vibration spray nozzle devices according to claim 1, it is characterised in that: the entrance collapsible tube (1), single order resonant cavity (2), second order resonant cavity (3) and water outlet spray piece (4) series connection, cooperation constitute resonant cavity.

6. double rank high-pressure water jet self-vibration spray nozzle devices according to claim 1, it is characterised in that: the single order resonant cavity Body (2) upper end end point is equipped with groove, and groove inner ring is equipped with O shape rubber seal one (7) and entrance collapsible tube (1) cooperation is close Envelope；Second order resonant cavity (3) upper end end point is equipped with groove, and groove inner ring is equipped with O shape rubber seal two (8) and single order resonance Cavity (2) cooperation sealing；It is equipped with groove at second order resonant cavity (3) and water outlet spray piece (4) joint face, is provided with O in groove Shape rubber seal three (9) cooperation sealing.

7. double rank high-pressure water jet self-vibration spray nozzle devices according to claim 1, it is characterised in that: the water outlet sprays piece (4) it is formed by hard alloy substrate is nested with polycrystalline diamond inner hole.

8. double rank high-pressure water jet self-vibration spray nozzle devices according to claim 1, it is characterised in that: the entrance collapsible tube (1), single order resonant cavity (2), second order resonant cavity (3) internal diameter be sequentially reduced.