A nozzle and assembly for switching spray patterns by varying flow rate

Abstract

This invention discloses a nozzle and assembly that switch spray modes by changing the flow rate, relating to the field of nozzle technology and applicable to edible oil spraying scenarios. The nozzle includes a first channel, a second channel, and a straight flow channel. The first channel has a conical converging structure, and the second channel has a fan-shaped diffuser structure. A through-hole transitions between the two channels, incorporating a planar and stepped design. The assembly includes a nozzle and a press-type pump head, with the nozzle and pump head snap-fitted together and rotatable. Dual-mode switching is achieved by controlling the fluid flow rate: low flow rate forms a concentrated water column, suitable for targeted oil injection; high flow rate forms a uniform fan-shaped atomization, suitable for controlled oil spraying. This invention features a simple structure, is integrally injection molded, eliminates leakage risks, requires no additional switching mechanism, is easy to operate and clean, has a simple production process, and is suitable for mass production, effectively solving the shortcomings of existing nozzles such as single mode and inconvenient switching.

Description

Technical Field

[0001] This invention relates to the field of nozzle technology, specifically to a nozzle and assembly that switches the spray mode by changing the flow rate. It is particularly suitable for spraying edible liquids such as cooking oil and can be widely used in kitchen cooking, food processing and other fields to achieve flexible switching between uniform oil spraying and fixed-point oil injection. Background Technology

[0002] Existing spraying devices for edible liquids such as cooking oil mostly use nozzles as their core component, which typically only form a cone-shaped atomized spray, making it difficult to meet the diverse usage needs in the cooking process.

[0003] For example, in actual cooking, users need both fan-shaped atomized spray to achieve even oil spraying on the surface of food and to control oil and reduce fat, and concentrated water jet spray to inject oil into localized areas such as the bottom and sides of the pan to avoid oil waste. Traditional single-mode oil spray nozzles are limited by their flow channel structure design and cannot achieve quick switching between water jet mode and fan-shaped mode on the same structure, resulting in extremely poor flexibility and difficulty in adapting to different cooking scenarios.

[0004] Currently, the few multi-mode spray nozzles on the market still have many shortcomings and cannot meet the needs of practical applications: First, the flow channel structure design is complex, often using multiple sets of valves or movable parts to achieve mode switching. When switching between two modes, problems such as liquid cross-contamination and unstable spray patterns can easily occur, affecting the user experience. Second, the switching mechanism is cumbersome to operate, and the connection between the movable parts and the flow channel has poor sealing, which can easily lead to oil leakage and seepage during use and storage, resulting in grease waste and safety hazards. Third, the internal flow channel has many bends and a complex structure, making it easy for grease to remain after use, which is difficult to clean and does not meet food hygiene and safety requirements. Fourth, the large number of parts and complex assembly process lead to high production costs, which is not conducive to mass production and market application.

[0005] Therefore, developing an edible oil spray nozzle that is simple in structure, reliable in switching, has good sealing performance, is hygienic and safe, and can stably achieve dual-mode spraying of water jet and fan surface through simple operation, to solve the above-mentioned defects of the existing technology, has important practical application value and broad market demand. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing edible oil spray nozzles, such as single spray mode and inconvenient switching, and to provide an edible oil spray nozzle with a simple structure, convenient switching, and stable dual-mode spray of water jet and fan, which meets the diverse needs of uniform oil spray and fixed-point oil injection during cooking, improves user experience, reduces production costs, and is suitable for mass production applications.

[0007] The present invention first discloses a nozzle that switches the injection mode by changing the flow rate, including a first channel (1) and a second channel (2) for fluid to pass through, wherein the fluid enters the nozzle through the first channel (1) and is ejected from the second channel (2);

[0008] The first channel (1) includes two opposing lateral surfaces (11) and two opposing frontal surfaces (12). The two lateral surfaces (11) gradually approach each other along the fluid flow direction, so that the first channel (1) is constructed into a conical structure, which can pressurize the fluid. The end of the first channel (1) along the fluid flow direction is a through hole (3) connected to the second channel (2). The through hole (3) serves as a transition structure between the first channel (1) and the second channel (2) to achieve smooth fluid flow.

[0009] The second channel (2) includes two opposing lateral surfaces (21) and two opposing frontal surfaces (22). The two lateral surfaces (21) gradually move away from each other along the fluid flow direction, so that the second channel (2) is constructed into a fan-shaped structure. This fan-shaped structure can guide the fluid to achieve atomization and diffusion, forming a fan-shaped spray pattern.

[0010] As a preferred embodiment of the present invention, the included angle between the two opposing lateral surfaces (11) is 30° to 50°. This angle range was determined through multiple experiments and optimizations. It ensures the effective pressurization effect of the first channel (1) on the fluid, enabling the fluid to form a stable water column at low flow rates, while avoiding excessive flow resistance and increased energy consumption due to an excessively small angle, or insufficient pressurization and inability to achieve stable mode switching due to an excessively large angle. Preferably, the included angle between the two lateral surfaces (11) is 40°, at which point the pressurization effect and flow resistance reach the optimal balance, and the stability of mode switching is optimal.

[0011] As a preferred embodiment of the present invention, the included angle between the two lateral surfaces (21) is 60° to 120°. This included angle range is used to control the width of the fan-shaped spray, which can meet the needs of large-area uniform oil spraying, and avoid the problem of the fluid dispersing too quickly and the spraying distance being too short if the included angle is too large, or the fan surface being too narrow and unable to achieve uniform coverage if the included angle is too small. Preferably, the included angle between the two lateral surfaces (21) is 100°, at which point the fan-shaped spray width is moderate, the atomization effect is uniform, and it is suitable for most cooking scenarios.

[0012] As a preferred technical solution of the present invention, the minimum distance between the two lateral surfaces (21) is greater than the minimum distance between the two lateral surfaces (11), ensuring that the fluid can diffuse smoothly when it enters the second channel (2) from the first channel (1), avoiding problems such as fluid congestion and disordered jet pattern; a plane (23) is provided at the junction of the lateral surface (21) and the lateral surface (11), which plays a transitional guiding role, reducing the flow resistance of the fluid at the junction of the two channels, avoiding eddies, and further improving the stability of the jet pattern.

[0013] As a preferred embodiment of the present invention, the angle between the plane (23) and the fluid flow direction is ≤90°. This angle design guides the fluid smoothly into the fan-shaped structure of the second channel (2) along the plane (23), avoiding backflow or turbulence at the transition point, ensuring that a uniform fan-shaped jet can be quickly formed at high flow rates, while further optimizing the smoothness of fluid flow and reducing energy loss. Preferably, the angle between the plane (23) and the fluid flow direction is 80° to 90°, which provides the best transition and guiding effect.

[0014] As a preferred embodiment of the present invention, the distance between the two positive surfaces (12) is greater than the distance between the two positive surfaces (22), and a step (24) is provided at the junction of the positive surface (12) and the two positive surfaces (22). The step (24) can further pressurize and limit the fluid at high flow rates, so that the excess fluid forms an instantaneous high pressure under the obstruction of the step (24), and then spreads rapidly under the guidance of the fan-shaped structure of the second channel (2), forming a uniform fan-shaped atomized spray; while at low flow rates, the fluid can smoothly cross the step (24) to form a stable water column spray. Preferably, the distance between the two positive surfaces (12) is 1.2 mm, the distance between the two positive surfaces (22) is 1 mm, and the height of the step (24) is 0.2 mm. These size parameters have been optimized through experiments to achieve optimal sensitivity and stability in mode switching.

[0015] As a preferred technical solution of the present invention, the fluid enters the first channel (1) through a straight flow channel (4). The straight flow channel (4) is formed by an inner wall (41), and its inlet end is a square through hole (7). The inner wall (41) is seamlessly connected to the lateral surface (11) and the front surface (12) respectively. The straight flow channel (4) is used to realize the pre-buffering and smooth flow of the fluid, which can provide a stable fluid volume for the pressurization process of the first channel (1) and avoid the failure of the injection mode switching or the disorder of the injection pattern due to the unstable fluid supply. The inner wall (41) is seamlessly connected to the lateral surface (11) and the front surface (12) of the first channel (1), which can eliminate the gaps at the connection of the flow channel, avoid the risk of oil leakage and seepage, reduce the fluid flow resistance, and facilitate cleaning, which meets the requirements of food hygiene.

[0016] As a preferred embodiment of the present invention, the through hole (3) is a rectangular hole formed by the plane (23), the lateral surface (11), and the step (24). The joint between the plane (23) and the lateral surface (11) is 0.5-0.6 mm, and the step (24) is 0.6-0.7 mm. The design of the rectangular through hole enables the fluid to be ejected from the cross section of the through hole when it enters the second channel (2) from the first channel (1) if the flow rate is low; if the flow rate is high, the flow rate on the lateral surface (11) side of the cross section is higher, and it is easier to form a fan-shaped spray by adhering to the lateral surface (21) under the action of the Coanda effect. Preferably, the size of the rectangular through hole 3 is 0.5 mm × 0.6 mm, which matches the size parameters of the first channel (1) and the second channel (2), and can realize the smooth transition and efficient flow of the fluid. Of course, the oil output can also be increased or decreased by adjusting the size of the through hole 3.

[0017] The present invention further discloses a nozzle and assembly, the specific technical solution of which is as follows:

[0018] A nozzle and assembly, comprising the nozzle described in any of the above technical solutions and a press-type pump head (5), wherein the nozzle is detachably mounted on the press-type pump head (5), and when the press-type pump head (5) is pressed down, the fluid in the container enters the nozzle under the suction of the pump body and is ejected through the nozzle, and the greater the speed at which the press-type pump head (5) is pressed down, the greater the flow rate of the fluid, thereby realizing the rapid switching of the injection mode.

[0019] As a preferred technical solution of the present invention, the nozzle is made of polyoxymethylene (POM) and the press-type pump head (5) is made of polypropylene (PP) by injection molding. Polypropylene is non-toxic, odorless, high temperature resistant, oil resistant and hard, which is suitable for the contact requirements of edible liquids, and is easy to injection mold, reducing the difficulty of production; Polypropylene is low hardness, good wear resistance and strong toughness, which can meet the repeated pressing needs of the press-type pump head (5) and extend the service life of the components; Both are integrally molded by injection molding, which has high production efficiency, and are fixedly connected by snap-fit, which is easy to assemble and easy to disassemble and clean, further improving the convenience and hygiene safety of use.

[0020] Compared with the prior art, the nozzle and components of the present invention have the following significant advantages through optimized flow channel structure design:

[0021] (1) Simple structure, excellent sealing performance, and no risk of leakage: The nozzle of the present invention adopts an integrated injection molding process, and the first channel, the second channel, the straight flow channel and the through hole are seamlessly connected without any gaps or moving parts. This fundamentally solves the problem of oil leakage and seepage of existing multi-mode nozzles, while avoiding sealing failure caused by wear of moving parts and extending the service life of the product. Moreover, the overall structure is simple, without complex corners, and easy to clean after use, which meets the requirements of food hygiene and safety.

[0022] (2) No additional switching mechanism required, achieving stable switching between two modes: This invention sets up a first channel with conical contraction and a second channel with fan-shaped diffusion, combined with the structural design of steps and transition planes. No additional switching mechanism such as valves or knobs is required. The two spray modes of water column and fan surface can be quickly and stably switched by controlling the fluid flow rate. At low flow rate, a concentrated water column is formed, which is suitable for fixed-point oil injection requirements. At high flow rate, a uniform fan surface atomization is formed, which is suitable for uniform oil spraying and oil control and grease reduction requirements. The switching sensitivity is high, the spray pattern is stable, and there is no cross-contamination phenomenon.

[0023] (3) Simple operation and high flexibility of use: The components of this invention are equipped with a press-type pump head. Users can adjust the fluid flow rate by controlling the speed of the press-type pump head, thereby switching the spray mode. The operation is convenient and there is no need for complicated learning costs. At the same time, the nozzle and the pump head are connected by a snap-fit, which allows the nozzle to be rotated flexibly to adjust the direction of the fan spray, adapting to different cooking scenarios and usage needs, and further improving the flexibility of use.

[0024] (4) Simple production process, low production cost, suitable for mass production: The nozzle and the press pump head of the present invention are both integrally molded by injection molding process, with fewer parts and simple assembly process, which effectively reduces the production difficulty and production cost; the selected polypropylene and polyoxymethylene raw materials are readily available and inexpensive, and the injection molding production efficiency is high, which can meet the needs of mass industrial production and facilitate market promotion and application. Attached Figure Description

[0025] Figure 1 This is a perspective view of one side of the nozzle outlet of the present invention;

[0026] Figure 2 This is a half-sectional view of the nozzle of the present invention (along the lateral surface direction).

[0027] Figure 3 This is a perspective view of the liquid inlet side of the nozzle of the present invention;

[0028] Figure 4 This is a half-sectional view of the nozzle of the present invention (section and...). Figure 2 (perpendicular, along the positive surface direction);

[0029] Figure 5 This is a three-dimensional view of the nozzle of the present invention;

[0030] Figure 6 This is a schematic diagram of an application scenario (initial spray direction) of the nozzle and component of the present invention.

[0031] Figure 7 This is a schematic diagram of another application scenario of the nozzle and components of the present invention (spray direction after rotation).

[0032] Wherein: 1-first channel, 11-lateral surface of the first channel, 12-frontal surface of the first channel, 2-second channel, 21-lateral surface of the second channel, 22-frontal surface of the second channel, 23-plane, 24-step, 3-through hole, 4-straight flow channel, 41-inner wall of the straight flow channel, 5-press pump head, 6-fixing ring, 7-square through hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] This embodiment provides a nozzle that switches the spray mode by changing the flow rate. It is integrally injection molded from polypropylene (PP) raw material, and its structure is as follows: Figures 1 to 5 As shown, it includes a first channel 1, a second channel 2, and a straight flow channel 4 for fluid to pass through. The fluid flows in the following direction: it first enters the first channel 1 through the straight flow channel 4, then enters the second channel 2 through the through hole 3 at the end of the first channel 1, and finally exits from the second channel 2.

[0036] Specifically, the first channel 1 includes two opposing lateral surfaces 11 and two opposing frontal surfaces 12. The included angle between the two lateral surfaces 11 is 30° to 50°, and in this embodiment, it is preferably 40°. This included angle causes the two lateral surfaces 11 to gradually approach each other along the fluid flow direction, thereby constructing the first channel 1 into a conical contraction structure, which can effectively pressurize the fluid passing through. The end of the first channel 1 along the fluid flow direction is a through hole 3 that is seamlessly connected to the second channel 2. The through hole 3 is a rectangular through hole with a preferred size of 0.5mm × 0.6mm, which is used to realize the smooth transition and guidance of fluid from the first channel 1 to the second channel 2.

[0037] The second channel 2 includes two opposing lateral surfaces 21 and two opposing frontal surfaces 22. The included angle between the two lateral surfaces 21 is 60° to 120°, and is preferably 100° in this embodiment. This included angle setting causes the two lateral surfaces 21 to gradually move away from each other along the fluid flow direction, thereby constructing the second channel 2 into a fan-shaped diffusion structure to guide the fluid to achieve atomization diffusion and form a uniform fan-shaped spray pattern.

[0038] Furthermore, the minimum distance between the two lateral surfaces 21 is greater than the minimum distance between the two lateral surfaces 11, ensuring that the fluid can diffuse smoothly when entering the second channel 2 from the first channel 1, avoiding problems such as fluid congestion and disordered jet pattern; a plane 23 is provided at the junction of the lateral surface 21 and the lateral surface 11, and the distance of the plane 23 from the lateral surface 21 to the lateral surface 11 is 0.5~0.6mm, preferably 0.55mm in this embodiment; the angle between the plane 23 and the fluid flow direction is ≤90°, preferably 85° in this embodiment. This angle design can guide the fluid to smoothly enter the fan-shaped structure of the second channel 2 along the plane 23, reduce flow resistance, and avoid eddies.

[0039] In addition, the distance between the two positive surfaces 12 is 1.2 mm, the distance between the two positive surfaces 22 is 1 mm, and a step 24 with a height of 0.2 mm is provided at the junction of the positive surface 12 and the two positive surfaces 22. The step 24 can further pressurize and limit the fluid at high flow rates, and optimize the uniformity of the fan-shaped jet.

[0040] The straight flow channel 4 is enclosed by an inner wall 41, which is seamlessly connected to the lateral surface 11 and the front surface 12 of the first channel 1 to form a complete fluid passage. The inlet of the straight flow channel 4 is a square through hole 7 with a size of 1.5mm × 1.5mm. The function of the straight flow channel 4 is to realize the pre-buffering and smooth flow of fluid, provide a stable fluid volume for the pressurization process of the first channel 1, and avoid the failure of injection mode switching or the disorder of injection pattern due to unstable fluid supply.

[0041] The working principle of the nozzle in this embodiment is as follows: After the fluid enters the nozzle through the square through-hole 7, it is first smoothly guided to the first channel 1 through the straight flow channel 4. Under the action of the conical contraction structure of the first channel 1, the pressure is gradually increased. When the controlled fluid flow rate is lower than the critical value (the critical flow rate in this embodiment is 0.8 m / s), the fluid can smoothly cross the step 24 after passing through the through-hole 3 and flow along the positive surface 22 of the second channel 2, eventually forming a concentrated and stable liquid column spray, which is suitable for the fixed-point oil injection requirement. When the controlled fluid flow rate is higher than the critical value, the excess fluid is further pressurized by the blocking effect of the step 24 when passing through the through-hole 3. Under the guidance of the transition flow of the plane 23 and the fan-shaped structure of the second channel 2, the fluid spreads rapidly and forms a uniform fan-shaped atomized spray, which is suitable for the requirements of uniform oil spraying and oil control and fat reduction. Among them, the included angle of the lateral surface 21 and the depth of the positive surface 22 of the second channel 2 can flexibly adjust the width of the fan-shaped liquid surface and the atomization effect, which can be adjusted according to the actual cooking needs.

[0042] Example 2

[0043] This embodiment further provides a nozzle and assembly, including the nozzle described in Embodiment 1 and a press-type pump head 5, structurally as follows: Figure 5 and Figure 6 As shown, the nozzle can be detachably installed on the press-type pump head 5. The specific connection method is as follows: the outer wall of the fluid inlet end of the nozzle (i.e. the inlet end of the straight flow channel 4) is cylindrical, and a fixing ring 6 is provided on it. The press-type pump head 5 is provided with a groove at the position that cooperates with it. The fixing ring 6 and the groove are engaged with each other to realize the quick fixing and disassembly of the nozzle and the pump head, which is convenient for cleaning and replacement.

[0044] In this embodiment, the press-type pump head 5 is made of polypropylene (PP) in one piece through injection molding. The material has high hardness and good wear resistance, which can meet the needs of repeated pressing. The nozzle is made of polyoxymethylene (POM) through injection molding. It is non-toxic, oil-resistant, and high-temperature resistant, and is suitable for contact with edible liquids.

[0045] The working principle of the component in this embodiment is as follows: During use, the component is installed on a container filled with edible liquids such as cooking oil. When the press-type pump head 5 is pressed down, a negative pressure is generated inside the pump body, drawing the fluid from the container into the straight flow channel 4. The fluid then passes sequentially through the first channel 1, the through hole 3, and the second channel 2, finally being sprayed out through the second channel 2. The user can adjust the fluid flow rate by controlling the downward movement speed of the press-type pump head 5—when the pressing speed is slow, the fluid flow rate is below a critical value, and the nozzle sprays a concentrated liquid column, achieving targeted oil injection; when the pressing speed is fast, the fluid flow rate is above the critical value, and the nozzle sprays a uniform fan-shaped atomization, achieving uniform oil spraying. Simultaneously, because the nozzle and the press-type pump head 5 are connected by a snap-fit ​​mechanism, the nozzle can be rotated flexibly to adjust the direction of the fan-shaped spray, such as... Figure 7 As shown, it further enhances the flexibility of use and adapts to different cooking scenarios (such as frying, stir-frying, roasting, etc.).

[0046] Example 3

[0047] This embodiment is a further improvement on embodiment 1. Its structure is basically the same as that of embodiment 1, except that: the included angle between the two lateral surfaces 11 is 35°, the included angle between the two lateral surfaces 21 is 80°, the distance from the lateral surface 21 to the lateral surface 11 of the plane 23 is 0.5mm, and the included angle between the plane 23 and the fluid flow direction is 90°; the size of the square through hole 7 is 1.4mm × 1.4mm, the distance between the two positive surfaces 12 is 1.1mm, the distance between the two positive surfaces 22 is 0.9mm, and the height of the step 24 is 0.18mm.

[0048] The nozzle in this embodiment has been tested and verified to have good pressurization effect and mode switching stability. At low flow rates, the water column is concentrated and there is no dispersion. At high flow rates, the fan surface is uniform, the atomization effect is good, the flow resistance is smaller, and the energy consumption is lower, making it suitable for the use of small-capacity edible liquid containers.

[0049] Example 4

[0050] This embodiment is a further improvement on embodiment 1. Its structure is basically the same as that of embodiment 1, except that: the included angle between the two lateral surfaces 11 is 45°, the included angle between the two lateral surfaces 21 is 110°, the distance from the lateral surface 21 to the lateral surface 11 of the plane 23 is 0.6 mm, and the included angle between the plane 23 and the fluid flow direction is 80°; the size of the square through hole 7 is 1.6 mm × 1.6 mm, the distance between the two positive surfaces 12 is 1.3 mm, the distance between the two positive surfaces 22 is 1.1 mm, and the height of the step 24 is 0.22 mm.

[0051] The nozzle in this embodiment has been tested and verified to have a wider fan-shaped spray width and a more uniform atomization effect, making it suitable for large-area uniform oil spraying needs (such as oil spraying on baking trays, oil spraying on food surfaces, etc.). It also has higher sensitivity in mode switching and a more comfortable feel when pressing.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A nozzle that switches injection modes by changing flow rate, characterized in that, It includes a first channel (1) and a second channel (2) for fluid to pass through, the fluid enters the nozzle through the first channel (1) and is ejected through the second channel (2); The first channel (1) includes two opposing lateral surfaces (11) and two opposing frontal surfaces (12). The two lateral surfaces (11) gradually approach each other along the fluid flow direction, so that the first channel (1) is constructed into a conical structure. The end of the first channel (1) along the fluid flow direction is a through hole (3) connected to the second channel (2). The second channel (2) includes two opposing lateral surfaces (21) and two opposing frontal surfaces (22), the two lateral surfaces (21) gradually moving away from each other along the fluid flow direction so that the second channel (2) is constructed as a fan-shaped structure.

2. The nozzle according to claim 1, characterized in that, The included angle between the two opposing lateral surfaces (11) is 30° to 50°.

3. The nozzle according to claim 1, characterized in that, The included angle between the two lateral surfaces (21) is 60° to 120°.

4. The nozzle according to claim 1, characterized in that, The minimum distance between the two lateral surfaces (21) is greater than the minimum distance between the two lateral surfaces (11), and a plane (23) is provided at the junction of the lateral surface (21) and the lateral surface (11).

5. The nozzle according to claim 4, characterized in that, The angle between the plane (23) and the direction of fluid flow is ≤90°.

6. The nozzle according to claim 1, characterized in that, The distance between the two positive surfaces (12) is greater than the distance between the two positive surfaces (22), and a step (24) is provided at the junction of the positive surface (12) and the two positive surfaces (22).

7. The nozzle according to claim 1, characterized in that, Fluid enters the first channel (1) through a straight flow channel (4), which is surrounded by an inner wall (41) that is connected to the lateral surface (11) and the front surface (12) respectively.

8. The nozzle according to claim 6, characterized in that, The through hole (3) is a rectangular hole formed by the plane (23), the side surface (11), and the step (24). The joint between the plane (23) and the side surface (11) is 0.5-0.6 mm, and the step (24) is 0.6-0.7 mm.

9. A nozzle and assembly comprising any one of claims 1 to 8, characterized in that, Includes a press-type pump head (5), the nozzle is installed on the press-type pump head (5), when the press-type pump head (5) is pressed down, the fluid in the container is ejected through the nozzle, and the greater the speed at which it is pressed down, the greater the flow rate of the fluid.

10. The nozzle and assembly according to claim 9, characterized in that, The nozzle is made of polyoxymethylene and the press-type pump head (5) is made of polypropylene, respectively, through injection molding.

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