CN114602675B - A Noise Reduction Nozzle with Split Flow Structure - Google Patents

Abstract

The invention discloses a noise reduction nozzle with a split flow structure. A bamboo tube is installed at the rear end of the base, the front end of the base and the rear end of the nozzle are fixedly connected coaxially, and the front end of the nozzle and the rear end of the outer nozzle head are connected through the inner nozzle head set inside, the base, nozzle It communicates with the inner cavity of the outer nozzle head and installs the nozzle core in the connected inner cavity, the rear end of the nozzle core is connected to the fluid source through the infusion hose, the inner nozzle head is provided with an inner nozzle groove, and the outer peripheral surface of the nozzle core is provided with a nozzle core blind hole . By improving the structure of the nozzle head, the present invention divides the main air flow to form a secondary jet, which can strengthen the air mixing effect of the main jet, strengthen the mixing in the shear layer, and reduce noise, and the manufacturing process is less changed. , has the characteristics of simplicity and economy.

Description

A Noise Reduction Nozzle with Split Flow Structure

technical field

The invention belongs to the noise reduction nozzle structure in the technical field of nozzle noise reduction, and in particular relates to a nozzle that uses gas as a carrier to spray liquid droplets.

Background technique

The commonly used spray production method is pneumatic atomization, which gathers the airflow and liquid in two coaxial pipes, the central pipe conveys the liquid, and the outer pipe conveys the gas, and uses high-pressure gas to strengthen the flow of the airflow around the liquid, so that The liquid contacts each other to generate vibration and friction, and the liquid is broken into fine droplets, which are atomized and sprayed out at the nozzle. This method is commonly used in industrial production to realize the directional delivery of cooling liquid or lubricating liquid.

The main function of the nozzle is to realize the atomization of the liquid, so the existing nozzles often only consider technical indicators such as atomization effect and spray distance in the design process, but the nozzle will also produce particularly serious noise pollution. Although a variety of noise reduction nozzles have appeared at present, such as noise reduction devices and injection systems for minimal lubrication (CN111590386B), this invention reduces the impact of turbulence intensity by opening an outlet to the nozzle body and filling it with noise reduction gas. distribution range for the purpose of noise reduction. A low-noise pneumatic nozzle (CN1876242A), the invention adds a plurality of micro-channels in the circumferential direction to the front end of the nozzle, and a boss with a cavity inside, so that a small amount of high-pressure gas is injected into the main jet of the nozzle to reduce the noise of the impact jet Purpose.

Contents of the invention

In order to solve the problems existing in the background technology, the present invention designs a noise-reducing nozzle that splits the main airflow to form a secondary jet without adding additional gas, and reduces the noise caused by the instability of the flow large-scale vortex structure. The stability of the vortex structure and the jet velocity are changed to reduce the noise.

Technical scheme of the present invention is:

The structure of the present invention includes a base, a nozzle pipe, an outer nozzle head, an inner nozzle head, a nozzle core, an infusion hose and a bamboo pipe; the rear end of the base is equipped with a bamboo pipe, and the front end of the base is coaxial Fixed connection, the front end of the spray pipe and the rear end of the outer nozzle head are connected through the inner nozzle head set inside, the base, the nozzle pipe and the inner cavity of the outer nozzle head are connected, and the nozzle core is installed in the connected inner cavity, behind the nozzle core The end is connected with the fluid source through the infusion hose, the inner nozzle head is provided with an inner nozzle groove, and the outer peripheral surface of the nozzle core is provided with a nozzle core blind hole.

An axial injection channel is arranged inside the nozzle core, and the injection channel communicates with the infusion hose.

The rear end of the base is equipped with multi-section bamboo tubes, and the connection between the bamboo tubes and the base and between adjacent bamboo tubes is universally articulated by ball joints.

A nozzle core fixing hole is provided in the middle of the inner cavity of the base, and the nozzle core fixing hole and the nozzle core are fitted together through threaded connection;

The front end of the base is provided with an internal thread as the connecting thread of the nozzle base, the rear end of the nozzle is provided with an external thread as the connecting thread of the nozzle base, the connecting thread of the base nozzle and the connecting thread of the nozzle base The screw connection makes the coaxial connection between the nozzle and the base.

The rear end of the nozzle is provided with an internal thread as the connecting thread of the inner nozzle head of the nozzle, the rear end of the outer nozzle head is provided with an internal thread as the inner thread of the outer nozzle head, and the outer peripheral surface of the main body of the inner nozzle head is provided with There is an external thread as the external thread of the internal nozzle, the second half of the external thread of the internal nozzle of the internal nozzle head is connected with the internal nozzle head of the spray pipe, and the first half of the external thread of the internal nozzle of the internal nozzle head is connected with the external nozzle of the external nozzle head. Head internally threaded threaded connection.

The outer thread of the inner nozzle provided in the inner nozzle head is provided with multiple inner nozzle grooves along the circumference, and each inner nozzle groove is arranged in the axial direction and extends to the front end of the inner nozzle head.

The front end of the outer nozzle head is processed into a conical truncated cone with a reduced diameter, and the front end of the inner nozzle head is processed into an inner nozzle truncated cone consistent with the conical truncated cone at the front end of the outer nozzle head.

The rear end of the nozzle core is provided with a nozzle core connector, which is connected to the infusion hose; the middle part of the nozzle core is processed with an outer flange as a nozzle core boss, and the gap between the nozzle core boss and the nozzle core connector is The outer peripheral surface of the nozzle core is processed as the connecting thread of the nozzle core base; the nozzle core part at the front end of the nozzle core boss is used as the main body of the nozzle core, and a plurality of blind hole groups arranged at intervals along the circumferential direction are set on the surface of the nozzle core main body. Each group is formed by a plurality of nozzle core blind holes arranged in a square along the axial direction.

The groups of blind holes of the nozzle core are arranged in one-to-one alignment with the inner nozzle grooves opened in the inner nozzle head in radial position along the circumferential direction.

The air flows through the base, the nozzle pipe and the inner cavity of the outer nozzle head, and is divided by the gas at the inner nozzle head. Most of the gas passes through the inner nozzle head, and a small part of the gas passes through the inner nozzle head groove on the outer wall of the inner nozzle head. Part of the separated gas joins at the front nozzle opening of the inner nozzle tip.

The invention can be used for the device about lubricating liquid delivery in the field of micro-lubrication.

The present invention adopts the method of splitting the main air flow to form a secondary jet flow at the nozzle opening without adding additional gas, which solves the problem that an additional high-pressure gas source needs to be added in the prior art.

The invention injects the main jet of the nozzle into the micro jet at a certain angle to form a secondary jet, strengthens the mixing of the main jet, accelerates the development of the shear layer, breaks the large-scale vortex structure, and forms a small-scale vortex to reduce noise.

Advantages of the present invention:

The present invention divides the main air flow to form a secondary jet by improving the structure of the nozzle head without adding additional gas separately. This structure can slightly increase the pressure of the gas injected into the nozzle, and the main gas split can reduce the axial velocity of the main jet. The diverted secondary jet is injected into the main jet at the nozzle mouth, which can strengthen the air mixing effect of the main jet, and at the same time, a number of evenly distributed blind holes are opened on the surface of the first half of the nozzle core, which affects the flow and pressure distribution near the wall in the nozzle core. Strengthen the mixing in the shear layer, thereby affecting the formation and development of the large-scale vortex structure at the nozzle mouth, reducing the stability of the large-scale vortex structure, breaking it into small-scale vortices faster, shortening the core length of the jet, and reducing noise role.

The present invention does not need to add additional equipment, but changes the structure of the nozzle itself, the manufacturing process is slightly modified, and has the characteristics of simplicity and economy, so it can be applied to various nozzles or nozzles that are not convenient to add other equipment. Noise reduction of nozzles that eject droplets as a carrier has a positive effect.

Description of drawings

Fig. 1 is a structural schematic diagram and a sectional view of a noise reduction nozzle;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the B-B sectional view of Fig. 1;

FIG. 4 is a schematic perspective view of the three-dimensional structure of the base 11;

FIG. 5 is a schematic cross-sectional structural view of the base 11;

Fig. 6 is the structural representation of nozzle 12;

Fig. 7 is a schematic structural view of the outer nozzle head 13;

Figure 8 is a schematic structural view of the inner nozzle head 14;

FIG. 9 is an end view of the inner nozzle head 14;

Fig. 10 is the A-A sectional view of Fig. 9;

FIG. 11 is a schematic diagram of a three-dimensional structure of the nozzle core 15;

FIG. 12 is a schematic cross-sectional structural view of the nozzle core 15 .

Figure 13 is a schematic diagram of the size of the nozzle head of the embodiment of the present invention;

Fig. 14 is a schematic diagram of the size of the nozzle core of the embodiment of the present invention;

Fig. 15 is a schematic diagram of the location of the noise reduction test implemented in the present invention.

Among the figure, base 11, base connector 111, base nozzle core fixing hole 112, base side wing plate 113, base nozzle connecting thread 114, nozzle 12, nozzle base connecting thread 121, nozzle in the nozzle Head connection thread 122, outer nozzle head 13, outer nozzle head internal thread 131, outer nozzle head front face 132, inner nozzle head 14, inner nozzle groove 141, inner nozzle round table 142, inner nozzle outer thread 143, nozzle core 15, nozzle Core connector 151, nozzle core base connecting thread 152, nozzle core boss 153, nozzle core body 154, nozzle core blind hole 155, nozzle core front face 156, infusion hose 16, bamboo tube 17.

specific implementation

The present invention will be further described below in conjunction with the accompanying drawings and specific implementation.

As shown in Fig. 1-Fig. 3, it is a structural schematic diagram and a cross-sectional view of the noise reduction nozzle. Its structure comprises base 11, nozzle pipe 12, outer nozzle head 13, inner nozzle head 14, nozzle core 15, infusion hose 16 and bamboo tube 17; It is coaxially fixedly connected with the rear end of the nozzle pipe 12,

The front end of the spray pipe 12 and the rear end of the outer nozzle head 13 are connected by the inner nozzle head 14 which is set inside, and the inner nozzle head 14 is located in the front end of the nozzle pipe 12 and the rear end of the outer nozzle head 13. A coaxial cavity is provided inside the outer nozzle head 13. The base 11, the nozzle pipe 12 and the inner cavity of the outer nozzle head 13 are connected and a nozzle core 15 is installed in the connected inner cavity. The rear end of the core 15 is connected to the fluid source through the infusion hose 16, the infusion hose 16 is arranged through the bamboo tube 17, the front end of the nozzle core 15 extends into the front end of the inner nozzle head 14, and the inner nozzle head 14 is provided with an inner nozzle groove 141 , a nozzle core blind hole 155 is provided on the outer peripheral surface of the nozzle core 15 .

An axial injection channel is arranged inside the nozzle core 15 , and the injection channel communicates with the infusion hose 16 .

The rear end of the base 11 is equipped with multi-section bamboo tubes 17, and between the bamboo tubes 17 and the base 11, and between adjacent bamboo tubes 17, are universally hinged by ball joints. In a specific implementation, a hemispherical base connector 111 is provided at the tail of the base 11, and the base connector 111 forms a spherical connection with the bamboo tube 16 to realize airflow injection.

The liquid is conveyed through the infusion hose 16, and the compressed air is conveyed through the channels inside the bamboo tube 17 and outside the infusion hose 16, and finally the two converge at the front end of the nozzle core front face 156 of the nozzle core 15 to form an aerosol.

As shown in FIGS. 4-5 , they are schematic structural views of the base 11 . A nozzle core fixing hole 112 is provided in the middle of the inner cavity of the base 11, and the nozzle core fixing hole 112 is fixedly connected with the inside of the cavity of the base 11 through a plurality of base side wings 113 arranged at intervals along the outer peripheral surface along the circumferential direction. The side wings 113 connect the nozzle core fixing hole 112 with the base 11 , and the sheet-shaped base side wings 113 increase the flow area of the gas and reduce the generation of noise. The nozzle core fixing hole 112 and the nozzle core 15 are fitted together through threaded connection; the nozzle core fixing hole 112 has threads for threaded connection with the nozzle core base connecting thread 152 of the nozzle core 15 to fix the axial position of the nozzle core 15.

The front end of the base 11 is provided with an internal thread as the base nozzle connecting thread 114, and the rear end of the nozzle 12 is provided with an external thread as the nozzle base connecting thread 121, and the base nozzle connecting thread 114 and the nozzle base connecting thread 121 The threaded connection makes the coaxial connection between the spout 12 and the base 11 .

As shown in Figure 6, the rear end of the spray pipe 12 is provided with an internal thread as the nozzle head connecting thread 122 in the spray pipe, the rear end of the outer nozzle head 13 is provided with an internal thread as the internal thread 131 of the outer nozzle head, and the outer peripheral surface of the inner nozzle head 14 main body All be provided with external thread as internal nozzle external thread 143, the second half of internal nozzle external thread 143 of internal nozzle head 14 is threadedly connected with the inner nozzle head connection thread 122 of nozzle head of spray pipe 12, the internal nozzle external thread 143 of internal nozzle head 14 The first half is threadedly connected with the inner thread 131 of the outer nozzle head 13 , so that the front end of the spray pipe 12 and the rear end of the outer nozzle head 13 are coaxially connected through the inner nozzle head 14 .

The inner nozzle thread 143 provided by the inner nozzle head 14 is provided with a plurality of inner nozzle grooves 141 along the circumference, and each inner nozzle groove 141 is opened and arranged in the axial direction, and extends to the front end of the inner nozzle head 14, and also extends to the nozzle. The junction between the front end of the nozzle core front face 156 of the core 15 and the outer nozzle tip front face 132 .

The front end surface 132 of the outer nozzle tip and the front end surface of the inner nozzle tip 14 converge at the front surface 156 of the nozzle core.

The front end of the outer nozzle head 13 is processed into a conical frustum with a reduced diameter, and the front end of the inner nozzle head 14 is processed into an inner nozzle frustum 142 consistent with the conical frustum at the front end of the outer nozzle head 13 .

As shown in FIG. 7 , the outer nozzle head 13 is a rotary body structure with an internal thread, and cooperates with a plurality of grooves 141 on the outer surface of the inner nozzle 14 to form a split gas flow channel.

As shown in FIGS. 8-10 , the inner nozzle head 14 is composed of a threaded cylinder 143 and a circular platform 142 . There are a plurality of inner nozzle slots 141 on the outer surface, which cooperate with the outer nozzles 13, and are used for splitting the flow of gas. The inner nozzle groove 141 has a width b and a depth a. Among them, the preferred range of b is 0.5 mm to 1.5 mm, and the preferred range of a is 0.5 mm to 1 mm.

Nozzle core 15 rear end is provided with nozzle core connector 151, and nozzle core connector 151 is connected with infusion hose 16;

The nozzle core 15 is a metal tube with a hollow interior. The middle part is processed with an outer flange as the nozzle core boss 153. The outer peripheral surface of the nozzle core 15 between the nozzle core boss 153 and the nozzle core connector 151 is processed as a nozzle core base connection. Thread 152, the nozzle core base connecting thread 152 is used for threaded connection with the nozzle core fixing hole 112;

The nozzle core 15 part at the front end of the nozzle core boss 153 is used as the nozzle core main body 154, and the surface of the nozzle core main body 154 is provided with a plurality of blind hole groups arranged at intervals in the circumferential direction, and each blind hole group is composed of a plurality of nozzle core blind holes 155. Arranged in a square shape along the axis.

The liquid is ejected from the front port of the nozzle core 15 through the nozzle core 15, and the air flows through the base 11, the nozzle 12 and the inner cavity of the outer nozzle head 13, and is diverted by the gas at the inner nozzle head 14, most of which are from the inner nozzle head 14 through, a small portion of gas passes through the inner nozzle head groove 141 on the outer wall of the inner nozzle head 14, and the two parts of the separated gas merge at the front nozzle opening of the inner nozzle head 14. This can enhance the gas mixing at the nozzle mouth, and at the same time, evenly open multiple blind holes in the first half of the nozzle core, affect the flow and pressure distribution near the wall in the nozzle core, and strengthen the mixing in the shear layer, so that the nozzle Noise reduction.

Under such a structure, the present invention splits the nozzle head into two inner and outer parts, and opens a number of grooves on the outer wall of the inner nozzle head to form flow passages for the distribution gas to flow through. The jet stream rejoins the main air stream. These secondary jets are mixed into the main airflow of the nozzle, which strengthens the flow mixing of the main airflow, reduces the stability of the large-scale vortex structure at the nozzle mouth, breaks into small-scale vortices faster, and achieves the purpose of reducing noise.

As shown in Figures 11-12, the inverted tapered connector 151 at the end of the nozzle core 15 is connected to the infusion hose 16 for liquid injection. The outer thread 152 of the nozzle core is connected with the nozzle core fixing hole 112 of the base to fix the nozzle core. The boss 153 is used to limit the position of the nozzle core, so that the distance from the front end surface 156 of the nozzle core to the front end surface 132 of the nozzle head is t, and the preferred range of t is 2mm-3mm.

The main body 154 of the nozzle core is provided with a plurality of uniformly distributed blind holes 155, which affect the flow and pressure distribution near the wall in the nozzle core, and strengthen the mixing in the shear layer.

The blind hole has a depth d and a diameter c. Wherein, the preferred range of d is 0.5-1.5 mm, the preferred range of c is 1 mm-2 mm, and the preferred number of blind holes is 4-6.

Examples of nozzle cores:

The gas pressure used in the present invention ranges from 0.3MPa to 0.7MPa.

As shown in Figure 11, the diameter of the nozzle core blind hole in the example is 1 mm, the depth is 0.5 mm, and 6 blind holes are respectively opened in four directions.

As shown in FIG. 12 , in the example, the groove of the inner nozzle head has a width of 0.7 mm and a depth of 0.5 mm.

Noise reduction effect of nozzle core example:

Noise tests were carried out on the original nozzle structure without a shunt groove and the nozzle structure of the present invention (as shown in Figures 13-14). The test plan diagram is shown in Figure 15. The measurement radius R is 0.5m, and the measurement angle θ is respectively 15°, 30°, 45°, 60°, 75°, and 90° to obtain the following data (see Table 1).

Table 1

Through comparison, it can be obtained that in the six selected measurement angles, the noise of the split nozzle is lower than that of the original nozzle, and the maximum value can reach 3.48dB, so the present invention has a better noise reduction effect.

Claims (9)

1. A noise-reducing nozzle with a split flow structure, characterized in that: its structure includes a base (11), a spray pipe (12), an outer nozzle tip (13), an inner nozzle tip (14), a nozzle core (15) , the infusion hose (16) and the bamboo tube (17); the bamboo tube (17) is installed at the rear end of the base (11), and the coaxial fixed connection between the front end of the base (11) and the rear end of the spray pipe (12) , the front end of the nozzle pipe (12) and the rear end of the outer nozzle head (13) are connected through the inner nozzle head (14) set inside, the base (11), the nozzle pipe (12) and the outer nozzle head (13) The cavity is connected and a nozzle core (15) is installed in the connected inner cavity, the rear end of the nozzle core (15) is connected to the fluid source through an infusion hose (16), and the inner nozzle head (14) is provided with an inner nozzle groove (141), The outer peripheral surface of the nozzle core (15) is provided with a nozzle core blind hole (155); The inner nozzle external thread (143) of the inner nozzle head (14) is provided with multiple inner nozzle grooves (141) along the circumference, and each inner nozzle groove (141) is arranged along the axial direction and extends to the inner nozzle head. (14) front face; The rear end of the nozzle core (15) is provided with a nozzle core connector (151), and the nozzle core connector (151) is connected to the infusion hose (16); the middle part of the nozzle core (15) is processed with an outer flange as a nozzle The core boss (153), the nozzle core (15) peripheral surface between the nozzle core boss (153) and the nozzle core connector (151) is processed into the nozzle core base connecting thread (152); the nozzle core boss (153 ) part of the nozzle core (15) at the front end is used as the nozzle core main body (154), and the surface of the nozzle core main body (154) is provided with a plurality of blind hole groups arranged at intervals in the circumferential direction, and each blind hole group is formed by a plurality of nozzle core blind holes. The holes (155) are formed in a square arrangement along the axial direction. 2. A noise reduction nozzle with a split flow structure according to claim 1, characterized in that: The nozzle core (15) is provided with an axial injection channel inside, and the injection channel communicates with the infusion hose (16). 3. A noise reduction nozzle with a split flow structure according to claim 1, characterized in that: The rear end of the base (11) is equipped with multi-section bamboo tubes (17), and between the bamboo tubes (17) and the base (11) and between adjacent bamboo tubes (17) are all connected by ball hinges. hinged. 4. A noise reduction nozzle with a split flow structure according to claim 1, characterized in that: A nozzle core fixing hole (112) is provided in the middle of the inner cavity of the base (11), and the nozzle core fixing hole (112) and the nozzle core (15) are fitted together through threaded connections. 5. A noise reduction nozzle with a split flow structure according to claim 1, characterized in that: The front end of the base (11) is provided with an internal thread as the base nozzle connecting thread (114), and the rear end of the nozzle (12) is provided with an external thread as the nozzle base connecting thread (121). The nozzle pipe connecting thread (114) and the nozzle base connecting thread (121) are threadedly connected so that the nozzle pipe (12) and the base (11) are coaxially connected. 6. A noise reduction nozzle with a split flow structure according to claim 1, characterized in that: The rear end of the nozzle (12) is provided with an internal thread as the nozzle head connecting thread (122) in the nozzle, and the rear end of the outer nozzle head (13) is provided with an internal thread as the inner thread (131) of the outer nozzle head. The outer peripheral surface of the main body of the inner nozzle head (14) is provided with an external thread as the outer thread of the inner nozzle (143), and the second half of the outer thread of the inner nozzle (143) of the inner nozzle head (14) is connected with the nozzle pipe (12) Nozzle head connecting thread (122) is threaded in the spray pipe, and the first half of the inner nozzle external thread (143) of the inner nozzle head (14) is threaded with the outer nozzle head internal thread (131) of the outer nozzle head (13). 7. A noise reduction nozzle with a split flow structure according to claim 1, characterized in that: The front end of the outer nozzle head (13) is processed into a conical truncated cone with a reduced diameter, and the front end of the inner nozzle head (14) is processed into an inner nozzle truncated cone (142) consistent with the front end of the outer nozzle head (13). ). 8. A noise reduction nozzle with a split flow structure according to claim 1, characterized in that: Each blind hole group of the nozzle core (15) is arranged in one-to-one alignment with each inner nozzle groove (141) opened in the inner nozzle head (14) in a radial position along the circumferential direction. 9. A noise reduction nozzle with a split flow structure according to claim 1, characterized in that: The air flows through the inner cavity of the base (11), nozzle (12) and outer nozzle head (13), and is divided by gas at the inner nozzle head (14), most of which pass through the inner nozzle head (14), less Part of the gas passes through the inner nozzle groove (141) on the outer wall of the inner nozzle head (14), and the two parts of the separated gas merge at the front nozzle opening of the inner nozzle head (14).

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