Nozzle unit

Abstract

To equalize the concentration of an odorant in a feed gas by stably supplying the odorant to the feed gas.SOLUTION: A nozzle unit (1) for supplying an odorant to a feed gas (X) flowing through a main pipe (Y) includes a liquid reservoir (4) having a storage groove side 4a for storing an odorant liquid (Z) which is a liquid odorant, an odorant liquid feed pipe (5) having a liquid discharge port side 5a for discharging the odorant liquid (Z) located inside the storage groove side 4a, and an odorant liquid guide (8) located below the liquid reservoir (4) for guiding downward the odorant liquid (Z) overflowing from the storage groove side 8a along the storage groove side 4a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a nozzle unit. [Background technology]

[0002] Patent Document 1 discloses an odorant addition device that drips odorant into a gas supply pipe. The odorant addition device disclosed in Patent Document 1 includes a drip nozzle that drips odorant and an odorant receiving member provided below the drip nozzle. The drip nozzle of the odorant addition device disclosed in Patent Document 1 is provided inside with a storage section that stores odorant and a narrow flow path section that guides odorant from the bottom of the storage section toward a drip opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-78295 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a nozzle that drips odorant from a drip opening located at the bottom, as in Patent Document 1, the dripping amount is unstable when the flow rate of the dripped odorant is small. In other words, when the flow rate of the dripped odorant is small, odorant droplets fall intermittently, making it difficult to continuously supply odorant to the gas flowing through the mother pipe. Furthermore, when the flow rate of the dripped odorant is small, droplets are first formed to adhere to the periphery of the drip opening. The droplets formed around the drip opening attempt to become spherical due to surface tension, but fall as their weight increases. This occurs repeatedly, causing odorant droplets to fall intermittently. When odorant droplets fall intermittently in this way, the concentration of odorant in the gas flow becomes uneven.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to make it possible to equalize the concentration of odorant in the gas by stably supplying odorant to the gas. [Means for solving the problem]

[0006] The present invention employs the following configuration as a means for solving the above problems.

[0007] One aspect of the present invention is a nozzle unit that diffuses odorant into a gas flowing through a main pipe, and is configured to include a liquid reservoir section having a reservoir groove that stores odorant liquid, which is the liquid odorant; an odorant liquid supply pipe having a drain port located inside the reservoir groove for discharging the odorant liquid; and an odorant liquid guide section that is located below the liquid reservoir section and guides the odorant liquid that overflows from the reservoir groove downward by running along its surface. [Effects of the Invention]

[0008] In the present invention, odorant liquid is supplied from an odorant liquid supply pipe into the interior of a storage groove in which the odorant liquid is stored. This prevents the odorant liquid discharged from the odorant liquid supply pipe from forming droplets, and prevents intermittent discharge even when the supply amount of odorant liquid is small. Furthermore, according to the present invention, odorant liquid that overflows from the storage groove evaporates while flowing along the surface of the odorant liquid guide portion and diffuses into the sent gas. Therefore, according to the present invention, odorant liquid is continuously supplied from the odorant liquid supply pipe to the storage groove, and the odorant liquid continuously overflows from the storage groove onto the surface of the odorant liquid guide portion, and the odorant is continuously supplied from the surface of the odorant liquid guide portion to the sent gas. Therefore, according to the present invention, by stably supplying odorant to the sent gas, it is possible to equalize the odorant concentration in the sent gas. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a cross-sectional view showing a schematic configuration of a nozzle unit according to an embodiment of the present invention. [Figure 2]FIG. 2 is a schematic enlarged cross-sectional view including a relay section and a liquid reservoir section provided in a nozzle unit according to an embodiment of the present invention. [Figure 3] 10 is a schematic diagram showing a reservoir groove of a nozzle unit in one embodiment of the present invention as viewed from above. FIG. [Figure 4] 3 is a schematic perspective view of a lower end portion of an odorant liquid supply pipe provided in a nozzle unit according to an embodiment of the present invention. FIG. [Figure 5] 3 is a schematic diagram of an odorant liquid guide portion provided in a nozzle unit according to one embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of a nozzle unit according to the present invention will be described with reference to the drawings.

[0011] FIG. 1 is a cross-sectional view showing a schematic configuration of a nozzle unit 1 of this embodiment. Note that a mesh groove portion 8d and an annular groove portion 8e, which will be described later, are omitted from the illustration in FIG. 1. The nozzle unit 1 of this embodiment is disposed inside a mother pipe Y through which a delivery gas X, such as city gas, flows, and supplies an odorant to the delivery gas X. In other words, the nozzle unit 1 of this embodiment is disposed in the flow path of the delivery gas X. As shown in FIG. 1, the nozzle unit 1 of this embodiment includes a base portion 2, a relay portion 3 (cover portion), a liquid reservoir portion 4, an odorant liquid supply pipe 5, an internal pipe 6, a filling member 7, and an odorant liquid guide portion 8.

[0012] The base 2 is a portion fixed to the main pipe Y, and directly or indirectly supports the relay section 3, the liquid reservoir section 4, the odorant liquid supply pipe 5, the internal pipe 6, the filling member 7, and the odorant liquid guide section 8. As shown in Fig. 1, the base 2 includes a cylindrical main body section 2a and a flange section 2b.

[0013] The cylindrical main body 2a is formed in a cylindrical shape with its axial direction extending in the vertical direction. In other words, the cylindrical main body 2a is formed hollow. An odorant liquid supply pipe 5 and an internal pipe 6 are inserted into the interior of the cylindrical main body 2a. A filler 7 is also housed inside the cylindrical main body 2a. In other words, the interior of the cylindrical main body 2a is filled with the filler 7. However, the filler 7 does not necessarily have to be provided inside the cylindrical main body 2a.

[0014] The flange portion 2b is a disk-shaped portion provided so as to protrude radially outward from the circumferential surface of the cylindrical main body portion 2a. The flange portion 2b has bolt insertion holes 2b1 formed therein, through which bolts (not shown) are inserted. For example, the nozzle unit 1 of this embodiment is fixed by fastening the flange portion 2b to a piping nozzle (not shown) connected to the mother pipe Y with bolts. Alternatively, the nozzle unit 1 of this embodiment may be fixed to the mother pipe Y by fastening the flange portion 2b to the mother pipe Y with bolts. However, the method of fixing the nozzle unit 1 to the mother pipe Y is not limited to that of this embodiment, and other fixing methods such as welding or adhesive may be used.

[0015] The relay portion 3 is a member located below the base portion 2, and located between the base portion 2 and the liquid reservoir portion 4. The relay portion 3 is a cover portion that covers the odorant liquid supply pipe 5 from the radial outside. The relay portion 3 is arranged so as to form a gap S between itself and a storage groove 4a (described later) of the liquid reservoir portion 4. This gap S connects the upper space of the storage groove 4a and the external space of the nozzle unit 1 of this embodiment.

[0016] 2 is a schematic enlarged cross-sectional view including the relay section 3 and the liquid reservoir section 4. As shown in this figure, the relay section 3 is a hollow member having an internal space 3a located above the reservoir groove 4a. The internal space 3a is formed in a circular ring shape when viewed from above.

[0017] 2, the relay section 3 has an air hole 3b. The air hole 3b connects the internal space 3a of the relay section 3 (the space above the storage groove 4a) to the external space of the relay section 3. More specifically, the air hole 3b is formed so as to penetrate from the inner wall surface of the internal space 3a to the outer wall surface of the relay section 3. A plurality of such air holes 3b are provided and arranged in a ring shape when viewed from above.

[0018] The relay section 3 also has a central through-hole 3c located in the center when viewed from above. The central through-hole 3c is a through-hole that passes through the relay section 3 in the vertical direction. An internal pipe 6 is inserted through the central through-hole 3c. Furthermore, a shaft section 4b (described later) of the liquid reservoir section 4 is inserted into the central through-hole 3c.

[0019] The relay section 3 also has pipe insertion holes 3d through which the odorant liquid supply pipes 5 are inserted. A plurality of the pipe insertion holes 3d are provided so as to be arranged in the circumferential direction around the central through-hole 3c when viewed from above. Specifically, the number of the pipe insertion holes 3d is the same as the number of the odorant liquid supply pipes 5. Each of the pipe insertion holes 3d is provided so as to extend in the vertical direction, and is formed so as to reach from the upper end surface of the relay section 3 to the internal space 3a.

[0020] The upper end of the relay part 3 is fixed to the lower end of the base part 2. For example, a male thread is formed on the circumferential surface of the upper end of the relay part 3, and a female thread is formed on the inner circumferential surface of the lower end of the base 2, and the male thread of the relay part 3 is screwed into the female thread of the base part 2, thereby fixing the relay part 3 and the base part 2 together.

[0021] The liquid reservoir 4 has a reservoir groove 4a that stores odorant liquid Z, which is a liquid odorant. As shown in FIG. 2, the liquid reservoir 4 has a shaft portion 4b and a large diameter portion 4c. The shaft portion 4b has a through-hole 4d that penetrates in the vertical direction and is formed in a cylindrical shape. An internal pipe 6 is inserted through the through-hole 4d. The upper part of the shaft portion 4b is inserted into the central through-hole 3c of the relay portion 3 from below.

[0022] For example, a female thread is formed on the inner peripheral surface of the central through-hole 3c of the relay part 3, and a male thread is formed on the upper outer peripheral surface of the shaft part 4b of the liquid reservoir part 4. The male thread of the shaft part 4b is screwed into the female thread of the relay part 3, thereby fixing the relay part 3 and the liquid reservoir part 4 together.

[0023] The large diameter portion 4c is located at the center of the shaft portion 4b in the up-down direction and is formed to protrude radially outward from the shaft portion 4b. The large diameter portion 4c is formed to have a larger diameter than the shaft portion 4b. The above-mentioned storage groove 4a is provided on the upper end surface of the large diameter portion 4c. The storage groove 4a is a groove that is filled with the odorant liquid Z and is formed in an annular shape when viewed from above. The storage groove 4a is arranged so as to overlap the internal space 3a of the relay portion 3 when viewed from above.

[0024] The diameter of the large diameter portion 4c is formed to be the same or approximately the same as the diameter of the relay portion 3. Therefore, the outer peripheral surface of the large diameter portion 4c and the outer peripheral surface of the relay portion 3 are arranged to overlap when viewed from above. The above-mentioned gap S is provided between the large diameter portion 4c and the relay portion 3. The odorant liquid Z that has overflowed from the storage groove 4a flows out through the gap S.

[0025] 3 is a schematic diagram including the storage groove 4a as seen from above. As shown in this figure, a plurality of odorant liquid supply pipes 5 are connected to the annular storage groove 4a. These odorant liquid supply pipes 5 are arranged at equal intervals along the storage groove 4a.

[0026] The odorant liquid supply pipe 5 is a pipe for supplying the odorant liquid Z to the storage groove 4a. As shown in Fig. 1, a supply unit 100 for supplying the odorant liquid Z to the odorant liquid supply pipe 5 is connected to the odorant liquid supply pipe 5. Also, as shown in Fig. 1, the lower end of the odorant liquid supply pipe 5 is disposed inside the storage groove 4a.

[0027] 4 is a schematic perspective view of the lower end of the odorant liquid supply pipe 5. As shown in this figure, a drain port 5a is provided at the lower end of the odorant liquid supply pipe 5 for discharging the odorant liquid Z from the inside of the odorant liquid supply pipe 5 to the outside. The drain port 5a opens to the side (i.e., horizontally). For example, a plurality of drain ports 5a are provided at the lower end of each odorant liquid supply pipe 5. These drain ports 5a are located below the upper end of the storage groove 4a. In other words, the drain ports 5a are located below the liquid level of the odorant liquid Z stored in the storage groove 4a.

[0028] The internal pipe 6 is a connecting pipe that is housed inside the base 2, the relay section 3, and the liquid reservoir section 4, and is connected to an internal space 8f (described later) of the odorant liquid guide section 8. The internal pipe 6 is inserted from above through the central through-hole 3c of the relay section 3 and the through-hole 4d of the liquid reservoir section 4, and its lower end is connected to an internal space 8f (described later) of the odorant liquid guide section 8. This internal pipe 6 can be used, for example, as a passage for inserting a heating section (e.g., hot water piping) inside the odorant liquid guide section 8. Note that if a heating section is not installed, it is possible to configure the odorant liquid guide section 8 without providing the internal pipe 6.

[0029] The filling member 7 is filled inside the cylindrical main body 2a of the base 2. The filling member 7 fills the spaces between the plurality of odorant liquid supply pipes 5 and the internal pipes 6 inside the cylindrical main body 2a. Such a filling member 7 may be, for example, a heat insulating material.

[0030] The odorant liquid guide portion 8 is fixed to the lower end of the liquid reservoir portion 4 and hangs down from the liquid reservoir portion 4. In other words, the odorant liquid guide portion 8 is located below the liquid reservoir portion 4. This odorant liquid guide portion 8 guides the odorant liquid Z that has overflowed from the storage groove 4a downward by allowing it to flow along the surface 8a.

[0031] FIG. 5 is a schematic diagram of the odorant liquid guide section 8. As shown in this figure, the odorant liquid guide section 8 has a body section 8b and a tip section 8c. The body section 8b is located above the tip section 8c and is a rod-shaped section whose upper end is connected to the liquid reservoir section 4. The diameter of the body section 8b decreases downward. In other words, the body section 8b is formed so as to taper downward. A mesh-like groove section 8d (groove section) is formed on the surface of this body section 8b.

[0032] The mesh grooves 8d are formed so as to recess from the surface of the body portion 8b toward the radially inward direction of the body portion 8b, forming a mesh shape. For example, the mesh grooves 8d are formed by intersecting a spiral groove wound clockwise when viewed from above with a spiral groove wound counterclockwise when viewed from above. Such mesh grooves 8d increase the surface area of ​​the body portion 8b. In other words, the surface area of ​​the body portion 8b is increased by providing the mesh grooves 8d compared to a case where the mesh grooves 8d are not provided. This increases the contact area between the odorant liquid Z and the gas X in the body portion 8b, thereby facilitating evaporation and diffusion of the odorant liquid Z.

[0033] The tip portion 8c is connected to the lower end of the body portion 8b and is formed in a spherical shape. As shown in Fig. 5, in this embodiment, the diameter of the tip portion 8c is larger than the diameter of the lower end of the body portion 8b. Therefore, the tip portion 8c bulges outward in the radial direction more than the body portion 8b, and prevents the odorant liquid Z from dropping downward from the lower end of the body portion 8b. A plurality of annular grooves 8e (grooves) are formed on the surface of such tip portion 8c.

[0034] Each annular groove 8e is a groove formed to have a circular ring shape when viewed from above. A plurality of such annular grooves 8e are arranged in the vertical direction on the surface of the tip portion 8c. Each annular groove 8e is formed to be recessed from the surface of the tip portion 8c toward the radially inward direction of the tip portion 8c, thereby increasing the surface area of ​​the tip portion 8c. In other words, the surface area of ​​the tip portion 8c is increased by providing the annular grooves 8e compared to when the annular grooves 8e are not provided. This increases the contact area between the odorant liquid Z and the gas X at the tip portion 8c, thereby facilitating evaporation and diffusion of the odorant liquid Z.

[0035] 1, an internal space 8f is formed inside the odorant liquid guide portion 8. The internal space 8f is formed to extend in the vertical direction along the odorant liquid guide portion 8, with its upper end opening upward. The internal space 8f is formed to a length that reaches the tip end 8c in the vertical direction. This internal space 8f is connected to the internal piping 6 as described above. This internal space 8f can be used, for example, as a space for inserting a heating unit (e.g., hot water piping) inside the odorant liquid guide portion 8. Note that if a heating unit is not installed, it is possible to configure the odorant liquid guide portion 8 without providing the internal space 8f.

[0036] In the nozzle unit 1 of this embodiment configured as described above, the odorant liquid Z is supplied from the supply unit 100 to each odorant liquid supply pipe 5. The odorant liquid Z supplied to the odorant liquid supply pipe 5 is supplied to the storage groove 4a from a drain port 5a provided at the lower end of the odorant liquid supply pipe 5.

[0037] The storage groove 4a is filled with the supplied odorant liquid Z. Therefore, when the odorant liquid Z is supplied to the storage groove 4a from the drain port 5a provided at the lower end of the odorant liquid supply pipe 5, the odorant liquid Z overflows from the storage groove 4a. The odorant liquid Z that overflows from the storage groove 4a passes through the gap S and flows downward along the surface of the relay section 3 due to the influence of gravity. Furthermore, the odorant liquid Z flows downward on the surface 8a of the odorant liquid guide section 8. The odorant liquid Z evaporates on the surface 8a of the odorant liquid guide section 8 and is diffused into the sent gas X.

[0038] The nozzle unit 1 of this embodiment as described above supplies odorant to the gas X flowing through the main pipe Y. The nozzle unit 1 of this embodiment also includes a liquid reservoir 4, an odorant liquid supply pipe 5, and an odorant liquid guide 8. The liquid reservoir 4 has a storage groove 4a that stores odorant liquid Z, which is a liquid odorant. The odorant liquid supply pipe 5 has a drain port 5a that discharges the odorant liquid Z, located inside the storage groove 4a. The odorant liquid guide 8 is located below the liquid reservoir 4, and guides the odorant liquid Z that overflows from the storage groove 4a downward by flowing along its surface 8a.

[0039] In the nozzle unit 1 of this embodiment, the odorant liquid Z is supplied from the odorant liquid supply pipe 5 into the storage groove 4a in which the odorant liquid Z is stored. This prevents the odorant liquid Z discharged from the odorant liquid supply pipe 5 from forming droplets, and prevents intermittent discharge even when the supply amount of the odorant liquid Z is small. Furthermore, according to the nozzle unit 1 of this embodiment, the odorant liquid Z that overflows from the storage groove 4a evaporates while flowing along the surface 8a of the odorant liquid guide portion 8 and diffuses into the sent gas X. Therefore, according to the nozzle unit 1 of this embodiment, the odorant liquid Z is continuously supplied from the odorant liquid supply pipe 5 to the storage groove 4a, the odorant liquid Z continuously overflows from the storage groove 4a onto the surface 8a of the odorant liquid guide portion 8, and the odorant is continuously supplied from the surface 8a of the odorant liquid guide portion 8 to the sent gas X. Therefore, according to the nozzle unit 1 of this embodiment, the odorant is stably supplied to the delivered gas X, and the concentration of the odorant in the delivered gas X can be made uniform.

[0040] Furthermore, in the nozzle unit 1 of this embodiment, the odorant liquid Z evaporates on the surface of the odorant liquid guide portion 8 and diffuses into the supplied gas X. This makes it possible to prevent the odorant liquid Z from accumulating on the wall surface of the parent pipe Y. If the odorant liquid Z accumulates on the wall surface of the parent pipe Y, the temperature of the parent pipe Y will affect the evaporation rate of the odorant liquid Z, and the amount of diffusion of the odorant liquid Z into the supplied gas X will change depending on the temperature of the parent pipe Y. In the nozzle unit 1 of this embodiment, it is possible to prevent the odorant liquid Z from accumulating on the wall surface of the parent pipe Y, and therefore it is possible to prevent the amount of diffusion of the odorant liquid Z into the supplied gas X from depending on the temperature of the parent pipe Y.

[0041] Furthermore, inside the mother pipe Y, the flow velocity of the supplied gas X is slower near the wall than in the central portion, and the evaporation efficiency of the odorant liquid Z (diffusion efficiency into the supplied gas X) decreases. In the nozzle unit 1 of this embodiment, by adjusting the length of the base 2, the odorant liquid guide section 8 can be positioned in the central portion of the mother pipe Y, and the evaporation efficiency of the odorant liquid Z (diffusion efficiency into the supplied gas X) can be increased.

[0042] Furthermore, in the nozzle unit 1 of this embodiment, the odorant liquid guide section 8 has a body section 8b and a tip section 8c. The body section 8b is formed in a rod shape with its upper end connected to the liquid reservoir section 4. The tip section 8c is connected to the lower end of the body section 8b and is formed in a spherical shape.

[0043] The nozzle unit 1 of this embodiment can increase the surface area of ​​the odorant liquid guide portion 8 compared to a nozzle unit 1 that does not have a spherical tip portion 8c. This makes it possible to more reliably evaporate the odorant liquid Z on the surface of the odorant liquid guide portion 8, and prevent the odorant liquid Z from dropping onto the wall surface of the main pipe Y. Furthermore, the tip portion 8c can block the downward flow of the odorant liquid Z, and increase the retention time of the odorant liquid Z on the surface of the odorant liquid guide portion 8. This further prevents the odorant liquid Z from dropping onto the wall surface of the main pipe Y.

[0044] Furthermore, in the nozzle unit 1 of this embodiment, grooves (mesh grooves 8d and annular grooves 8e) are formed on the surface 8a of the odorant liquid guide portion 8. This increases the surface area of ​​the odorant liquid guide portion 8, and makes it possible to more reliably evaporate the odorant liquid Z on the surface of the odorant liquid guide portion 8. The grooves may be provided on either the body portion 8b or the tip portion 8c.

[0045] The nozzle unit 1 of this embodiment also has a relay section 3. The relay section 3 is located above the liquid reservoir section 4 and is formed in a hollow shape so as to form a gap S between it and the storage groove 4a. The relay section 3 also has an air hole 3b that connects the internal space 3a of the storage groove 4a to the external space of the relay section 3.

[0046] For example, when maintenance is performed on the supply unit 100, etc., the purge gas used for the maintenance may remain in the supply unit 100, and may flow into the odorant liquid supply pipe 5 after the maintenance. When the purge gas flows into the odorant liquid supply pipe 5, the purge gas is discharged into the storage groove 4a. In the nozzle unit 1 of this embodiment, the purge gas discharged into the storage groove 4a can be discharged to the outside via the air hole 3b. This prevents the purge gas from interfering with the passage of the odorant liquid Z through the gap S, and enables the odorant liquid Z to be stably supplied to the gas supply X.

[0047] Furthermore, in the nozzle unit 1 of this embodiment, an internal space 8f with an open upper end is provided inside the odorant liquid guide portion 8. Furthermore, the nozzle unit 1 of this embodiment includes an internal pipe 6 connected to the internal space 8f. According to such a nozzle unit 1 of this embodiment, it becomes possible to insert a heating portion (e.g., a hot water pipe) into the odorant liquid guide portion 8, for example.

[0048] Furthermore, in the nozzle unit 1 of this embodiment, the storage groove 4a is provided in an annular shape when viewed from above. Therefore, according to the nozzle unit 1 of this embodiment, the odorant liquid Z can be made to overflow in all directions from the nozzle unit 1 when viewed from above, and the odorant liquid Z can be supplied to the gas X more evenly.

[0049] Furthermore, in the nozzle unit 1 of this embodiment, a plurality of odorant liquid supply pipes 5 are provided so as to be arranged in a ring shape along the storage groove 4a when viewed from above. According to such a nozzle unit 1 of this embodiment, the odorant liquid Z can be made to overflow evenly in all directions from the nozzle unit 1 when viewed from above, and the odorant liquid Z can be supplied more evenly to the sent gas X.

[0050] Furthermore, in the nozzle unit 1 of this embodiment, the drain port 5a is open toward the side. According to the nozzle unit 1 of this embodiment, it is possible to prevent the drain port 5a from being blocked by the bottom surface of the storage groove 4a, and it is possible to reduce the pressure loss in the odorant liquid supply pipe 5.

[0051] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above-described embodiments. The shapes and combinations of the components shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0052] The above embodiment can also be described as follows, for example:

[0053] (Appendix 1) A nozzle unit for supplying odorant to a gas flowing through a main pipe, a liquid reservoir having a reservoir groove for storing the liquid odorant; an odorant liquid supply pipe having a drain port for discharging the odorant liquid located inside the storage groove; an odorant liquid guide portion that is located below the liquid reservoir portion and that guides the odorant liquid that overflows from the reservoir groove downward by running along its surface; Equipped with A nozzle unit characterized by:

[0054] (Appendix 2) The odorant liquid guide portion is a rod-shaped body portion whose upper end is connected to the liquid reservoir portion; a spherical tip portion connected to the lower end of the body portion; have 2. The nozzle unit according to claim 1.

[0055] (Appendix 3) 3. The nozzle unit according to claim 2, wherein a groove is formed on at least a part of the surface of the odorant liquid guide portion.

[0056] (Appendix 4) a hollow cover portion located above the liquid reservoir portion and arranged to form a gap between the cover portion and the reservoir groove; The cover portion has an air hole that connects the upper space of the reservoir groove to the external space of the cover portion. 4. The nozzle unit according to any one of claims 1 to 3.

[0057] (Appendix 5) an internal space having an open upper end is provided inside the odorant liquid guide portion; a connecting pipe connected to the internal space; 5. The nozzle unit according to any one of claims 1 to 4.

[0058] (Appendix 6) 6. The nozzle unit according to any one of claims 1 to 5, wherein the reservoir groove is provided in an annular shape when viewed from above.

[0059] (Appendix 7) 7. The nozzle unit according to any one of claims 1 to 6, wherein a plurality of the odorant liquid supply pipes are provided so as to be arranged in a ring shape along the storage groove when viewed from above.

[0060] (Appendix 8) 8. The nozzle unit according to claim 1, wherein the drain port is open to the side. [Explanation of symbols]

[0061] DESCRIPTION OF SYMBOLS 1...Nozzle unit, 2...Base, 2a...Cylindrical main body, 2b...Flange, 2b1...Bolt insertion hole, 3...Relay section (cover), 3a...Internal space, 3b...Air hole, 3c...Central through-hole, 3d...Pipe insertion hole, 4...Liquid reservoir, 4a...Storage groove, 4b...Shaft, 4c...Large diameter section, 4d...Through-hole, 5...Odorant liquid supply pipe, 5a...Drain port, 6...Internal pipe (connecting pipe), 7...Filling member, 8...Odorant liquid guide section, 8a...Surface, 8b...Body, 8c...Tip, 8d...Reticulated groove section (groove section), 8e...Annular groove section (groove section), 8f...Internal space, 100...Supply section, S...Gap, X...Gas supply, Y...Main pipe, Z...Odorant liquid

Claims

1. A nozzle unit for supplying odorant to a gas flowing through a main pipe, a liquid reservoir having a reservoir groove for storing the liquid odorant; an odorant liquid supply pipe having a drain port for discharging the odorant liquid located inside the storage groove; an odorant liquid guide portion that is located below the liquid reservoir portion and that guides the odorant liquid that overflows from the reservoir groove downward by running along its surface; Equipped with A nozzle unit characterized by:

2. The odorant liquid guide portion is a rod-shaped body portion whose upper end is connected to the liquid reservoir portion; a spherical tip portion connected to the lower end of the body portion; have 2. The nozzle unit according to claim 1.

3. 3. The nozzle unit according to claim 2, wherein a groove is formed on at least a part of the surface of the odorant liquid guide portion.

4. a hollow cover portion located above the liquid reservoir portion and arranged to form a gap between the cover portion and the reservoir groove; The cover portion has an air hole that connects the upper space of the reservoir groove to the external space of the cover portion.

4. The nozzle unit according to claim 1, wherein the nozzle unit is a nozzle unit having a nozzle hole.

5. an internal space having an open upper end is provided inside the odorant liquid guide portion; a connecting pipe connected to the internal space; 4. The nozzle unit according to claim 1, wherein the nozzle unit is a nozzle unit having a nozzle hole.

6. 4. The nozzle unit according to claim 1, wherein the reservoir groove is provided in an annular shape when viewed from above.

7. 4. The nozzle unit according to claim 1, wherein a plurality of the odorant liquid supply pipes are provided so as to be arranged in a ring shape along the storage groove when viewed from above.

8. 4. The nozzle unit according to claim 1, wherein the drain port is open to the side.

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