Regulating ball valve, valve core setting method and throat secondary flow injection device

Abstract

The present application relates to the technical field of secondary flow injection, in particular to a regulating ball valve, a valve core setting method and a throat secondary flow injection device. The regulating ball valve comprises a valve seat, a spherical valve core, a sealing seat, an end cover and a sealing gasket. The valve seat comprises a valve seat base body and a communicating valve core cavity and a mounting cavity arranged on the valve seat base body, and the valve core cavity is provided with the mounting cavity on both sides. The valve core comprises a valve core base body and a communicating channel arranged on the valve core base body. The valve core base body is rotationally arranged in the valve core cavity. The sealing seat and the end cover are mounted in each mounting cavity. The sealing gasket is arranged between the sealing seat and the valve core base body. The end cover abuts against the outer side of the sealing seat. The end cover is fixedly connected with the valve seat base body. The sealing seat and the end cover are correspondingly provided with pipelines, and the communicating channel can communicate the two pipelines.

Description

Technical Field

[0001] This invention relates to the field of secondary flow injection technology, and in particular to a regulating ball valve, a valve core setting method, and a throat secondary flow injection device. Background Technology

[0002] Thrust regulation technology can effectively improve the maneuverability and penetration capability of rocket engines, and has become a key technology in rocket engine development. Aerodynamic throat technology generates thrust by injecting a secondary jet at the throat of the rocket engine nozzle, allowing the secondary flow to interact with the main flow. In solid-liquid rocket engines, aerodynamic throat technology typically uses a liquid oxidizer as the secondary flow medium, such as liquid hydrogen peroxide.

[0003] The ability to adjust the thrust of the engine under multiple operating conditions is key to the application of this technology. To adjust the flow rate of the secondary flow, a regulating valve is required. However, commonly used ground test engines are all small engines with extremely small nozzle sizes, resulting in small secondary flow injection mechanisms. The flow rate adjustment accuracy of existing regulating valves is not ideal. Summary of the Invention

[0004] The purpose of this invention is to provide a regulating ball valve and a throat secondary flow injection device to solve, to a certain extent, the technical problem of poor flow regulation accuracy in the prior art.

[0005] This invention provides a regulating ball valve, comprising: a valve seat, a spherical valve core, a sealing seat, an end cap, and a sealing gasket; the valve seat includes a valve seat base and a communicating valve core cavity and a mounting cavity disposed on the valve seat base, with mounting cavities provided on both sides of the valve core cavity; the valve core includes a valve core base and a communicating channel disposed on the valve core base; the valve core base is rotatably disposed within the valve core cavity, and each of the mounting cavities is equipped with the sealing seat and the end cap, with the sealing gasket disposed between the sealing seat and the valve core base, the end cap abutting against the outer side of the sealing seat, and the end cap being fixedly connected to the valve seat base; the sealing seat and the end cap are respectively provided with pipes, and the communicating channel can connect the two pipes.

[0006] Each mounting cavity is equipped with a sealing seat and an end cap, and corresponding pipes are provided on the sealing seat and end cap, forming two pipes. One pipe can be used as an input pipe, and the other as an output pipe. When the valve core base rotates, the regulating ball valve opens when the openings at both ends of the connecting channel are connected to the input and output pipes respectively. By rotating the valve core base, the area of ​​the connecting channel connected to the input pipe and the area of ​​the connecting channel connected to the output pipe can be changed, thereby regulating the fluid flow rate. The regulating ball valve provided by this invention adopts angular stroke adjustment, which can achieve a small size setting and miniaturization of the regulating ball valve, making it more suitable for adjusting the flow rate of secondary flow injection devices.

[0007] Furthermore, the sealing seat includes an annular base plate and an annular baffle fixed on the annular base plate, the annular baffle forming a first step with the annular base plate; the sealing gasket includes a first sealing gasket, one side of the first sealing gasket engaging with the first step, and the other side abutting against the valve core base.

[0008] Furthermore, the annular baffle is disposed in the middle of the annular substrate, a first step is formed between the inner side of the annular baffle and the annular substrate, a second step is formed between the outer side of the annular baffle and the outer side of the annular substrate, and a first mating step that mates with the second step is formed in the mounting cavity; the sealing gasket also includes a second sealing gasket, and the second sealing gasket is sandwiched between the second step and the first mating step.

[0009] Furthermore, a third step is formed on the end cap, a second mating step is formed in the mounting cavity, and a third sealing gasket is sandwiched between the third step and the second mating step.

[0010] Furthermore, the valve seat base has a through hole at its top and the valve core base has a transmission groove at its top. The through hole and the transmission groove are positioned opposite each other, and the transmission groove is used to insert the power output shaft of the motor.

[0011] Furthermore, an accommodating step is provided on the outside of the valve core base, above the through hole, and a sealing layer is provided on the accommodating step.

[0012] Furthermore, a groove is formed on the valve core base from a first side to a second side opposite to the first side, and the groove forms the communicating channel.

[0013] Furthermore, the valve core base is provided with mounting cavities on opposite sides, thereby making the pipe arranged in a straight line.

[0014] This invention provides a valve core setting method for setting the valve core of the aforementioned regulating ball valve, comprising:

[0015] The diameter of the pipe is determined based on the type of working fluid, the flow rate, and the flow rate adjustment range; the diameter of the valve core is then determined based on the pipe diameter.

[0016] The flow characteristics of the regulating ball valve are linear.

[0017] Determine the initial shape of the connecting channel under the corresponding flow characteristics, and express the shape of the connecting channel using a mathematical expression;

[0018] Calculate the resistance coefficient of the regulating ball valve under its initial shape;

[0019] Multiple different opening degrees are selected as design points, and the flow area of ​​the connecting channel under each opening degree is calculated, thereby calculating the flow coefficient of the regulating ball valve under different opening degrees.

[0020] The shape of the connecting channel is continuously changed, and the flow coefficient of the regulating ball valve under the corresponding connecting channel shape is calculated. The calculated flow coefficient is compared with the target flow coefficient. The shape of the connecting channel corresponding to the flow coefficient with the smallest difference from the target flow coefficient is the final shape of the connecting channel.

[0021] The present invention provides a throat secondary flow injection device, including the above-mentioned regulating ball valve, wherein the motor is drivenly connected to the regulating ball valve; the throat secondary flow injection device further includes a nozzle and a pipeline, one of the pipelines is used to communicate with an external secondary flow supply device, the other pipeline is connected to the pipeline, and the pipeline is connected to the nozzle.

[0022] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is an exploded view of a regulating ball valve according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 The cross-sectional view of the regulating ball valve shown;

[0026] Figure 3 This is a schematic diagram of the valve core in a regulating ball valve according to another embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the valve core in a regulating ball valve according to another embodiment of the present invention;

[0028] Figure 5 To adopt such Figure 4 The flow characteristic curve of the regulating ball valve shown is shown.

[0029] Figure 6 This is a schematic diagram of the secondary flow jet device according to an embodiment of the present invention.

[0030] Icons: 1-Valve seat; 2-Valve core; 3-Sealing seat; 4-End cap; 5-Pipeline; 6-First sealing gasket; 7-Second sealing gasket; 8-Third sealing gasket; 9-Sealing layer; 10-Motor; 20-Nozzle; 30-Pipeline; 201-Connecting channel; 202-Transmission groove. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0033] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] like Figures 1 to 3As shown, the present invention provides a regulating ball valve, comprising: a valve seat 1, a spherical valve core 2, a sealing seat 3, an end cap 4, and a sealing gasket; the valve seat 1 includes a valve seat base and a valve core cavity and an installation cavity disposed on the valve seat base, with installation cavities on both sides of the valve core cavity; the valve core 2 includes a valve core base and a communicating channel 201 disposed on the valve core base; the valve core base is rotatably disposed in the installation cavity of the valve core 2, and a sealing seat 3 and an end cap 4 are installed in each installation cavity, with a sealing gasket disposed between the sealing seat 3 and the valve core base, and the end cap 4 abutting against the outer side of the sealing seat 3, and the end cap 4 being fixedly connected to the valve seat base; the sealing seat 3 and the end cap 4 are respectively provided with pipes 5, specifically, the sealing seat 3 is provided with a sealing seat 3 pipe 5, and the end cap 4 is provided with an end cap 4 channel, the sealing seat 3 pipe 5 and the end cap 4 channel are connected to form a pipe 5 that allows fluid to flow, and the communicating channel 201 can connect the two pipes 5.

[0038] In this embodiment, each mounting cavity is provided with a sealing seat 3 and an end cap 4, and the sealing seat 3 and end cap 4 are respectively provided with pipes 5, thus forming two pipes 5. One pipe 5 can be used as an input pipe 5, and the other pipe 5 can be used as an output pipe 5. When the valve core base rotates, and the openings at both ends of the connecting channel 201 are connected to the input pipe 5 and the output pipe 5 respectively, the regulating ball valve opens. By rotating the valve core base, the area of ​​the connecting channel 201 connected to the input pipe 5 and the area of ​​the connecting channel 201 connected to the output pipe 5 can be changed, thereby adjusting the fluid flow rate. The regulating ball valve provided in this embodiment adopts angular stroke adjustment, which can achieve a small volume setting and a miniaturized setting of the regulating ball valve. It is more suitable for adjusting the amount of secondary flow injection device and is conducive to the direct connection of the regulating ball valve to the nozzle through the pipeline.

[0039] The end cap 4 and the mounting cavity can be connected by threads for easy installation.

[0040] The valve core cavity has mounting cavities on both sides, and the two sides of the valve core cavity can be arranged adjacent to each other, that is, the depth direction of the two mounting cavities intersects and the length direction of the two pipes 5 intersects. At this time, the connecting channel on the valve core base has a corner.

[0041] Optionally, mounting cavities are provided on opposite sides of the valve core base, so that the pipe 5 is arranged in a straight line. This can be understood as the center lines of the pipes 5 on both sides of the mounting cavity being on the same straight line, which allows the fluid to flow straight and reduces fluid resistance.

[0042] like Figure 1 and Figure 2 As shown, based on the above embodiment, the sealing seat 3 further includes an annular base plate and an annular baffle fixed on the annular base plate, the annular baffle and the annular base plate forming a first step; the sealing gasket includes a first sealing gasket 6, one side of the first sealing gasket 6 is engaged with the first step, and the other side abuts against the valve core base.

[0043] In this embodiment, the valve core base is spherically shaped, allowing the first step to be engaged with it. One side of the first sealing gasket 6 rests against the first step, and the other side rests against the transmitter body, thus achieving the installation of the first sealing gasket 6. Furthermore, fluid pressure is applied to the valve core, and then through the valve core, to the first sealing gasket. This compression action achieves a good sealing effect.

[0044] like Figure 1 and Figure 2 As shown, based on the above embodiment, the annular baffle is further disposed in the middle of the annular substrate, a first step is formed between the inner side of the annular baffle and the annular substrate, a second step is formed between the outer side of the annular baffle and the outer side of the annular substrate, and a first mating step that mates with the second step is formed in the mounting cavity; the sealing gasket also includes a second sealing gasket 7, and the second sealing gasket 7 is sandwiched between the second step and the first mating step.

[0045] In this embodiment, the fit between the second step and the first mating step not only secures the second sealing gasket 7 but also positions the sealing seat 3 during installation. The second sealing gasket 7 further improves the sealing performance of the regulating ball valve.

[0046] like Figure 1 and Figure 2 As shown, based on the above embodiment, a third step is formed on the end cap 4, a second mating step is formed in the mounting cavity, and a third sealing gasket 8 is sandwiched between the third step and the second mating step.

[0047] In this embodiment, the third step and the second mating step cooperate to position the end cover 4 and fix the third sealing gasket 8. The third sealing gasket 8 can further improve the sealing performance of the regulating ball valve.

[0048] like Figure 2 As shown, based on the above embodiment, the valve seat base is further provided with a through hole at the top and a transmission groove 202 at the top of the valve core base. The through hole and the transmission groove 202 are directly opposite each other. The transmission groove 202 is used to insert the power output shaft of the motor 10.

[0049] In this embodiment, the power output shaft of the motor 10 can pass through the through hole and extend into the transmission groove 202, thereby connecting with the valve core base and driving the valve core base.

[0050] like Figure 2 As shown, based on the above embodiment, a receiving step is further provided on the outside of the valve core substrate above the through hole, and a sealing layer 9 is provided on the receiving step.

[0051] In this embodiment, after the power output shaft of the motor is assembled with the valve core base, a sealing layer 9 is provided on the receiving step to seal the connection between the motor 10 and the regulating ball valve, thereby further improving the sealing performance of the regulating ball valve.

[0052] like Figure 3 As shown, based on the above embodiment, a groove is further formed on the valve core base in the direction from the first side of the valve core base to the second side opposite to the first side, and the groove forms the communication channel 201.

[0053] In this embodiment, under the premise that the valve core base can block the opening of the pipe 5, a groove is opened on the valve core base to reduce the weight of the valve core base and achieve lightweighting of the valve core base, thereby achieving lightweighting of the regulating ball valve.

[0054] This invention provides a method for setting a valve core 2, used to set the valve core 2 of a regulating ball valve in any of the above technical solutions, comprising:

[0055] The diameter of pipe 5 is determined based on the type of working fluid, flow rate, and flow rate adjustment range. The diameter of valve core 2 is then determined based on the diameter of pipe 5.

[0056] The flow characteristics of the regulating ball valve are linear.

[0057] Based on experience, the initial shape of the connecting channel 201 under the corresponding flow characteristics is determined, and the shape of the connecting channel 201 is expressed by a mathematical expression (mainly to facilitate simulation calculation by simulation software).

[0058] Use simulation software (e.g., ANSYS FLUENT) to calculate the resistance coefficient of the regulating ball valve under its initial shape;

[0059] Multiple different opening degrees are selected as design points, and the flow area of ​​the connecting channel 201 under each opening degree is calculated, thereby calculating the flow coefficient of the regulating ball valve under different opening degrees.

[0060] The shape of the connecting channel 201 is continuously changed, and the flow coefficient under the corresponding shape of the connecting channel 201 is calculated. The calculated flow coefficient is compared with the target flow coefficient. The shape of the connecting channel 201 corresponding to the flow coefficient with the smallest difference from the target flow coefficient is the final shape of the connecting channel.

[0061] Specifically, on the cross-section of the spherical valve core perpendicular to the length of the pipe, the outline of the connecting channel includes an arc segment and straight segments located on both sides of the arc segment; the shape of the connecting channel can be described by the radius r of the arc segment, the radian 2θ corresponding to the arc segment, the length l of the straight segment, and the angle ψ between the straight segment and the horizontal direction.

[0062] The flow characteristic refers to the relationship between the flow rate of fluid passing through the regulating ball valve and the opening degree of the regulating ball valve. Generally, the flow characteristic of a ball valve is a constant percentage regulation characteristic. However, under this characteristic, as the opening degree of the ball valve increases, the flow rate passing through the ball valve increases faster and faster, making it difficult to meet the high-precision regulation requirements within a small flow range. This embodiment selects a linear flow characteristic, which offers higher regulation accuracy and is also easier to control. The formula is as follows:

[0063]

[0064] In the formula, K v ξ is the flow coefficient, which can be calculated from the flow range and flow characteristics of the secondary flow regulation; A is the cross-sectional area of ​​pipe 5; ξ is the resistance coefficient, which is related to the flow area of ​​the regulating ball valve. Its specific expression is obtained through simulation calculation and fitting after initially selecting the opening shape of the valve core 2 connecting channel 201. The flow coefficient of the regulating ball valve under different shapes of the connecting channel 201 can be calculated using the above formula.

[0065] For example: the secondary working fluid is liquid hydrogen peroxide, the required flow rate adjustment range is 20–40 g / s, the selected pipe diameter is DN2 (30), and the throat inner diameter of the working nozzle 20 is Φ15 mm. The opening shape of the valve core of the designed regulating ball valve is as follows: Figure 4 As shown, the formula for calculating the drag coefficient obtained from simulation is:

[0066]

[0067] In the formula, A r Let A be the flow area of ​​the ball valve, and let A be the cross-sectional area of ​​pipe 5. The parameters of the connecting channel 201 are r = 0.7 mm, θ = 38°, l = 1.3 mm, and ψ = 5°.

[0068] The overall dimensions of the regulating ball valve are 10x6x6mm, the selected motor 10 is Φ3.4x11mm, and the nozzle 20 has a throat diameter of Φ15mm and a length of 50mm. It is evident that the designed regulating ball valve can achieve high-precision regulation within a relatively small flow regulation range, while its extremely small size allows for good matching with the small nozzle 20, representing an integrated design. The flow characteristic curves obtained from design and simulation are as follows... Figure 5 As shown, the maximum error between the simulated value and the target value is less than 10%.

[0069] The valve core 2 obtained by using the setting method provided in this embodiment can ensure the accuracy of flow regulation.

[0070] like Figure 6As shown, an embodiment of the present invention also provides a throat secondary flow injection device, including a motor 10 and a regulating ball valve of any of the above-described technical solutions, wherein the motor 10 is operatively connected to the regulating ball valve; the throat secondary flow injection device further includes a nozzle 20 and a pipeline 30, one pipeline 5 for communicating with an external secondary flow supply device, another pipeline 5 for communicating with the pipeline 30, and the pipeline 30 for communicating with the nozzle 20. Therefore, it possesses all the beneficial technical effects of the regulating ball valve, which will not be elaborated further here.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. Numerous specific details are set forth in the specification provided herein. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification. Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the present invention and form different embodiments.

Claims

1. A valve core setting method for setting the valve core (2) of a regulating ball valve, characterized in that, The regulating ball valve includes: a valve seat (1) and a ball valve core (2); the valve core (2) includes a valve core base and a connecting channel (201) provided on the valve core base; the valve seat (1) is provided with pipes (5) on both sides, and the connecting channel (201) can connect the two pipes (5); The setup method includes the following steps: The diameter of the pipe (5) is determined according to the type of working fluid, the flow rate and the flow rate adjustment range, and the diameter of the valve core (2) is determined according to the diameter of the pipe (5); The flow characteristics of the regulating ball valve are linear. Determine the initial shape of the connecting channel (201) under the corresponding flow characteristics, and express the shape of the connecting channel (201) using a mathematical expression; Calculate the resistance coefficient of the regulating ball valve under its initial shape; Multiple different opening degrees are selected as design points, and the flow area of ​​the connecting channel (201) under each opening degree is calculated, so as to calculate the flow coefficient of the regulating ball valve under different opening degrees. The shape of the connecting channel (201) is continuously changed, and the flow coefficient of the regulating ball valve under the corresponding shape of the connecting channel (201) is calculated. The calculated flow coefficient is compared with the target flow coefficient. The shape of the connecting channel (201) corresponding to the flow coefficient with the smallest difference from the target flow coefficient is the final shape of the connecting channel.

2. A regulating ball valve based on the valve core setting method of claim 1, characterized in that, The regulating ball valve further includes: a sealing seat (3), an end cap (4), and a sealing gasket; the valve seat (1) includes a valve seat base and a communicating valve core cavity and a mounting cavity disposed on the valve seat base, and the mounting cavity is provided on both sides of the valve core cavity; The valve core base is rotatably disposed in the valve core cavity. Each of the mounting cavities is equipped with a sealing seat (3) and an end cap (4). A sealing gasket is provided between the sealing seat (3) and the valve core base. The end cap (4) abuts against the outer side of the sealing seat (3). The end cap (4) is fixedly connected to the valve seat base. Corresponding pipes (5) are provided on the sealing seat (3) and the end cap (4). The connecting channel (201) can connect the two pipes (5).

3. The regulating ball valve according to claim 2, characterized in that, The sealing seat (3) includes an annular base plate and an annular baffle fixed on the annular base plate. The annular baffle forms a first step with the annular base plate. The sealing gasket includes a first sealing gasket (6). One side of the first sealing gasket (6) is engaged with the first step, and the other side abuts against the valve core substrate.

4. The regulating ball valve according to claim 3, characterized in that, The annular baffle is disposed in the middle of the annular substrate. A first step is formed between the inner side of the annular baffle and the annular substrate, and a second step is formed between the outer side of the annular baffle and the outer side of the annular substrate. A first mating step that mates with the second step is formed in the mounting cavity. The sealing gasket also includes a second sealing gasket (7), and the second sealing gasket (7) is sandwiched between the second step and the first mating step.

5. The regulating ball valve according to claim 4, characterized in that, A third step is formed on the end cap (4), a second mating step is formed in the mounting cavity, and a third sealing gasket (8) is sandwiched between the third step and the second mating step.

6. The regulating ball valve according to claim 2, characterized in that, The valve seat base has a through hole at the top and the valve core base has a transmission groove (202) at the top. The through hole and the transmission groove (202) are directly opposite each other. The transmission groove (202) is used to insert the power output shaft of the motor (10).

7. The regulating ball valve according to claim 6, characterized in that, An accommodating step is provided on the outside of the valve core base, above the through hole, and a sealing layer (9) is provided on the accommodating step.

8. The regulating ball valve according to claim 2, characterized in that, A groove is formed on the valve core base from a first side to a second side opposite to the first side, and the groove forms the communicating channel (201).

9. The regulating ball valve according to claim 2, characterized in that, The valve core base is provided with mounting cavities on opposite sides, so that the pipe (5) is arranged in a straight line.

10. A throat secondary flow injection device, characterized in that, The device includes a motor (10) and a regulating ball valve as described in any one of claims 2-9, wherein the motor (10) is operatively connected to the regulating ball valve; the throat secondary flow injection device further includes a nozzle (20) and a pipeline (30), one of the pipelines (5) being connected to an external secondary flow supply device, and the other pipeline (5) being connected to the pipeline (30), wherein the pipeline (30) is connected to the nozzle (20).

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