Spray nozzle components, sprayer, and cleaning device

Abstract

The present invention provides a nozzle component for a rotary nozzle type sprayer that enables smoother sliding between the shaft and cylindrical portion used in the rotation holding mechanism. [Solution] An injector comprising an arm portion on which a shaft portion is provided, and an injection nozzle rotatably held on the arm portion by a rotation holding mechanism, wherein liquid is circulated from the arm portion to the injection nozzle via a path in contact with the rotation holding mechanism, wherein an injection nozzle member provided on the injection nozzle and constituting the rotation holding mechanism together with the shaft portion has a cylindrical portion into which the shaft portion is fitted and which rotates while sliding with the shaft portion, and the cylindrical portion is provided with a communication hole that connects the outside and the inside to allow the liquid to pass through.

Description

Technical Field

[0001] The present invention relates to a member for an injection nozzle, as well as an injector and a washer including the same.

Background Art

[0002] Conventionally, there has been proposed an injector including an arm portion to which a liquid is supplied and an injection nozzle rotatably held by a rotation holding mechanism on the arm portion, and circulating the liquid from the arm portion to the injection nozzle so that the injection nozzle injects the liquid (hereinafter, may be referred to as "rotating nozzle type" for convenience).

[0003] For example, Patent Document 1 discloses a cleaning device including a cleaning tank in which an object to be cleaned is accommodated, a cleaning arm (an example of an arm portion) provided in the cleaning tank, and a cleaning nozzle (an example of an injection nozzle) rotatably held on the cleaning arm and injecting a liquid, and the cleaning nozzle injects the liquid while rotating in the cleaning tank. According to such a cleaning device, it is possible to effectively clean the object to be cleaned by injecting the liquid while rotating the cleaning nozzle.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As for the rotation holding mechanism described above, it is possible to employ a mechanism in which a shaft is provided on the cleaning arm side and a cylindrical part is provided on the cleaning nozzle side, with the shaft being fitted inside the cylindrical part, so that the cylindrical part rotates while sliding against the shaft. However, if a material that has relatively good sliding properties (smoothness in sliding with the shaft) is used for the cylindrical part (for example, PTFE with a dynamic friction coefficient of 0.1 and a hardness of R20), then the low hardness makes it prone to uneven wear due to sliding with the shaft.

[0006] On the other hand, if a material with relatively high hardness (for example, POM with a dynamic friction coefficient of 0.18 and a hardness of R118) is used for the cylindrical part, uneven wear can be minimized, but the sliding properties will decrease, which may hinder the smooth rotation of the cleaning nozzle. Therefore, even when forming the cylindrical part with a material that prioritizes hardness over sliding properties, it is preferable that the sliding between the shaft and the cylindrical part be smooth.

[0007] In view of the above-mentioned problems, the present invention aims to provide a spray nozzle member that can make the sliding between the shaft portion and the cylindrical portion used in the rotation holding mechanism of a rotary nozzle type sprayer smoother, as well as a sprayer and a cleaning device equipped therewith. [Means for solving the problem]

[0008] The spray nozzle member according to the present invention comprises an arm portion on which a shaft portion is provided, and a spray nozzle rotatably held on the arm portion by a rotation holding mechanism, wherein liquid is circulated from the arm portion to the spray nozzle via a path in contact with the rotation holding mechanism, and the spray nozzle member provided on the spray nozzle and constituting the rotation holding mechanism together with the shaft portion has a cylindrical portion into which the shaft portion is fitted and which rotates while sliding with the shaft portion, and the cylindrical portion is provided with a communication hole that connects the outside and the inside to allow the liquid to pass through. With this configuration, in a rotary nozzle type sprayer, it is possible to make the sliding between the shaft portion and the cylindrical portion used in the rotation holding mechanism smoother.

[0009] More specifically, the above configuration may be such that the cylindrical portion is provided with a first group of communication holes arranged in the axial direction, and adjacent communication holes in the first group of communication holes are connected to each other by a first auxiliary hole extending in the axial direction, allowing the liquid to pass through. More specifically, the above configuration may be such that the cylindrical portion is provided with a plurality of the first group of communication holes in the circumferential direction.

[0010] More specifically, the above configuration may be such that the cylindrical portion is provided with a second group of communication holes arranged in the circumferential direction, and adjacent communication holes in the second group of communication holes are connected to each other by a second auxiliary hole extending in the circumferential direction, allowing the liquid to pass through. More specifically, the above configuration may be such that the cylindrical portion is provided with a plurality of the second group of communication holes in the axial direction. Furthermore, more specifically, the above configuration may be such that a flange portion extending radially is provided at one end of the cylindrical portion in the axial direction, and the flange portion is used to fix it to the injection nozzle.

[0011] Furthermore, the sprayer according to the present invention comprises an arm portion on which a shaft portion is provided, and a spray nozzle rotatably held in the arm portion by a rotation holding mechanism, wherein liquid is circulated from the arm portion to the spray nozzle via a path in contact with the rotation holding mechanism, and the spray nozzle has a spray nozzle member having the above configuration, which is provided in the spray nozzle and together with the shaft portion constitutes the rotation holding mechanism.

[0012] Furthermore, the cleaning device according to the present invention is a cleaning device equipped with a sprayer having the above configuration, comprising a cleaning tank in which an object to be cleaned is contained, the arm portion and the spray nozzle are provided inside the cleaning tank, and the spray nozzle sprays the liquid while rotating, and the object to be cleaned is cleaned by applying the sprayed liquid to it. [Effects of the Invention]

[0013] According to the member for an injection nozzle according to the present invention, in a rotary nozzle type injector, it is possible to make the sliding between the shaft portion and the cylindrical portion used for the rotation holding mechanism smoother. Further, according to the injector or the washer according to the present invention, it is possible to enjoy the advantages of the member for an injection nozzle according to the present invention.

Brief Description of the Drawings

[0014] [Figure 1] It is a schematic view showing the washer according to the present embodiment. [Figure 2] It is a schematic perspective view showing the washing rack of the present embodiment. [Figure 3] It is a view showing a part of the washing rack in a state of being stored in the washing tank. [Figure 4] It is an exploded perspective view showing the attachment structure of the washing nozzle to the water distribution member. [Figure 5] It is a front view of the member for a washing nozzle according to the present embodiment. [Figure 6] It is a perspective view of the member for a washing nozzle. [Figure 7] It is a perspective view of the member for a washing nozzle. [Figure 8] It is a perspective view of the member for a washing nozzle when cut along a plane including the central axis. [Figure 9] It is a perspective view of the member for a washing nozzle provided with a second auxiliary hole. [Figure 10] It is a perspective view of the member for a washing nozzle in which the arrangement pattern of the communication holes is staggered. [Figure 11] It is a perspective view of the member for a washing nozzle in which the arrangement pattern of the communication holes is staggered. [Figure 12] It is a schematic longitudinal sectional view of the rotation holding mechanism according to the present embodiment and its vicinity. [Figure 13] It is a table regarding the conditions and results of the evaluation test.

Embodiments for Carrying Out the Invention

[0015] Embodiments of the present invention will be described below while referring to the respective drawings.

[0016] 1. Structure of the washer, etc. FIG. 1 is a schematic view showing the washer 1 of the present embodiment, with a part shown in cross-section. Here, for convenience of explanation, the left-right direction in FIG. 1 is defined as the left-right direction of the washer 1, the up-down direction in FIG. 1 is defined as the up-down direction of the washer 1, and the direction orthogonal to the plane of the paper in FIG. 1 is defined as the front-back direction of the washer 1 (the front side is the front, that is, the front face). In FIG. 1, the two-dot chain line indicates the outer shape of the washing rack 2 and the shelf 3.

[0017] The washer 1 includes a washing tank 4 that forms a washing space for the object to be washed, a liquid storage part 5 connected to the lower part of the washing tank 4, a washing rack 2 on which the object to be washed is placed and taken in and out of the washing tank 4, washing nozzles 6 provided on the washing tank 4 and the washing rack 2, a water supply means 7 to the liquid storage part 5, a drainage means 8 from the liquid storage part 5, a chemical liquid supply means 9 to the liquid storage part 5, a heating means 10 for heating the liquid L in the liquid storage part 5, a circulation means 11 for supplying the liquid L in the liquid storage part 5 to the washing nozzles 6, and a control means (not shown) for controlling each of these means 7 to 11.

[0018] The object to be washed is not particularly limited, but for example, it is a medical instrument such as forceps. In the state where the washing rack 2 is stored in the washing tank 4, a plurality of washing nozzles 6 are provided in the washing tank 4 in upper and lower multiple stages, and the object to be washed is arranged between the upper and lower washing nozzles 6. The object to be washed is placed on the shelf 3 of the washing rack 2, and the washing rack 2 is taken in and out of the washing tank 4 as a whole. At that time, the object to be washed may be accommodated in a basket or the like if desired.

[0019] In the example of the present embodiment, the washing tank 4 is in the shape of a substantially rectangular hollow box. The washing tank 4 is made openable and closable by a door (not shown). By opening the door, the washing rack 2 can be taken in and out of the washing tank 4. The door is provided on the front face of the washing tank 4, but may be provided on both the front and back faces of the washing tank 4.

[0020] A liquid storage section 5 is connected to the lower part of the cleaning tank 4. In other words, the cleaning tank 4 is equipped with a liquid storage section 5 at its lower part. In this embodiment, the lower wall of the cleaning tank 4 is formed as an inclined surface 12 at both the left and right ends, which slope downward as they move inward in the left-right direction, and the central part in the left-right direction is formed as a roughly rectangular recess downward, and the lower part of the cleaning tank 4, including this recess, is the liquid storage section 5.

[0021] The washing rack 2 comprises shelves 3 on which objects to be washed are placed, and washing nozzles 6 positioned below the shelves 3. In the illustrated example, the washing rack 2 has multiple shelves 3 arranged vertically, with washing nozzles 6 provided below each shelf 3. Each shelf 3 is formed by combining wires. As will be described in detail later, a water distribution member 13 is provided at one end of the washing rack 2, and the washing nozzles 6 are rotatably held by the water distribution member 13 via a washing arm 14.

[0022] In the storage position where the cleaning rack 2 is pushed to a predetermined position within the cleaning tank 4, the water passage duct 15 provided on the inner wall of the cleaning tank 4 and the water distribution member 13 provided on the cleaning rack 2 are connected, allowing liquid L to be supplied from the water passage duct 15 to the water distribution member 13.

[0023] The cleaning nozzle 6 sprays liquid L onto the object to be cleaned. When the cleaning rack 2 is stored inside the cleaning tank 4, the cleaning nozzles 6 are provided in multiple vertical rows inside the cleaning tank 4 via cleaning arms 14. In this embodiment, as shown in Figure 1, the cleaning nozzles 6 provided at both the upper and lower ends inside the cleaning tank 4 are provided on the cleaning tank 4 itself via cleaning arms 14, while the other cleaning nozzles 6 are provided on the cleaning rack 2 via cleaning arms 14. More specifically, regarding the holding of the cleaning nozzles 6 when the cleaning rack 2 is stored inside the cleaning tank 4, the base ends of hollow pipe-shaped cleaning arms 14 are held in multiple vertical rows on one side (the left side in Figure 1) of the central part in the front-to-back direction of the cleaning tank 4 (or cleaning rack 2), and each cleaning arm 14 extends from one side of the cleaning tank 4 toward the central part in the left-to-right direction. The longitudinal center of the cleaning nozzle 6 is held at the extension end so as to be rotatable around a vertical axis.

[0024] The cleaning nozzle 6 has multiple nozzle holes 16 (see Figure 4) that eject liquid L supplied through the cleaning arm 14. When liquid L is supplied to the cleaning nozzle 6 via the cleaning arm 14, the liquid L is ejected from the nozzle holes 16 of the cleaning nozzle 6. This jet causes the cleaning nozzle 6 to rotate around the end of the cleaning arm 14. The cleaning nozzle 6 located at the upper end of the cleaning tank 4 ejects liquid L only downwards, the cleaning nozzle 6 located at the lower end of the cleaning tank 4 ejects liquid L only upwards, and the cleaning nozzles 6 located at all ends eject liquid L both upwards and downwards. The cleaning arm 14 and the cleaning nozzle 6 are made of metal, such as stainless steel.

[0025] The water supply means 7 supplies water into the liquid storage section 5 (and optionally the washing tank 4) via a water supply channel 17. A water supply valve 18 is provided in the water supply channel 17. By opening the water supply valve 18, water can be supplied into the liquid storage section 5. The water supply means 7 may be configured to supply water selected from multiple types of water (for example, tap water, hot water, membrane filtered water, etc.).

[0026] The cleaning tank 4 is equipped with a liquid level detector 19. The liquid level detector 19 does not have a particularly specific configuration, but for example, it is composed of a pressure sensor installed at the bottom of the liquid storage section 5. In this case, the liquid level is determined by utilizing the fact that the water pressure changes according to the liquid level in the liquid storage section 5 and the cleaning tank 4.

[0027] The drainage means 8 discharges water from the liquid storage section 5 through the drainage channel 20. The drainage channel 20 is equipped with a drain valve 21. By opening the drain valve 21, water can be drained from the washing tank 4 and the liquid storage section 5.

[0028] The chemical supply means 9 supplies chemical solution from the chemical solution tank 22 to the liquid storage section 5 (or cleaning tank 4) via the supply passage 23. A chemical solution pump 24 is provided in the supply passage 23. By operating the chemical solution pump 24, a set amount of chemical solution can be supplied to the liquid storage section 5. The chemical supply means 9 may be configured to supply a chemical solution selected from multiple types of chemical solutions (for example, alkaline detergents, enzyme-based detergents, lubricating rust inhibitors, drying accelerators, etc.).

[0029] The heating means 10 heats the stored liquid in the liquid storage section 5. In this embodiment, the heating means 10 consists of a heater 25 provided in the liquid storage section 5. In the illustrated example, the heater 25 is an electric heater, but it may be a steam heater depending on the circumstances. In the case of an electric heater, it is typically controlled on and off, but the output may be adjusted depending on the circumstances. On the other hand, in the case of a steam heater, steam can be supplied into the steam pipe, and the condensed water of the steam is discharged to the outside via a steam trap. The opening and closing or degree of opening of the steam supply valve provided in the steam supply passage is controlled.

[0030] A temperature sensor 26 is provided in the liquid storage section 5. By controlling the heater 25 based on the temperature detected by the temperature sensor 26, the temperature of the liquid stored in the liquid storage section 5 can be adjusted.

[0031] The circulation means 11 circulates and supplies the liquid L from the liquid storage section 5 to the cleaning nozzles 6. Specifically, the circulation means 11 comprises a circulation pipe 27 and a circulation pump 28. The circulation pipe 27 is the piping from the liquid storage section 5 to the cleaning arms 14 of each cleaning nozzle 6, and includes the aforementioned water passage duct 15. The circulation pump 28 is located upstream of the water passage duct 15 in the circulation pipe 27, and a check valve 29 is provided at the outlet side of the circulation pump 28. When the circulation pump 28 is operated, the liquid L from the liquid storage section 5 is supplied to the cleaning nozzles 6 via the circulation pipe 27 (including the water passage duct 15), the water distribution member 13, and the cleaning arms 14, and is ejected from the cleaning nozzles 6. The liquid L ejected from the cleaning nozzles 6 is returned to the liquid storage section 5 at the bottom of the cleaning tank 4.

[0032] The cleaning unit 1 is also equipped with a drying blower 80 that generates hot air and supplies it to the circulation piping 27. The hot air supplied from the drying blower 80 to the circulation piping 27 is then sent into the cleaning tank 4 via the cleaning arm 14 and the cleaning nozzle 6 in sequence. This allows the cleaning unit 1 to drive the drying blower 80 and perform a drying operation to dry the objects to be cleaned.

[0033] In addition, the cleaning device 1 may be equipped with ultrasonic transducers 30 as desired. In the illustrated example, ultrasonic transducers 30 are provided on the left and right inclined surfaces 12 at the bottom of the cleaning tank 4. The ultrasonic transducers 30 are connected to an ultrasonic oscillator (not shown) to control their oscillation. By operating the ultrasonic transducers 30 while the object to be cleaned is immersed, the object to be cleaned can be ultrasonically cleaned.

[0034] The control means is a controller (not shown) connected to the liquid level detector 19 and temperature sensor 26, in addition to the means 7 to 11 described above. Specifically, the water supply valve 18, drain valve 21, chemical pump 24, heater 25, circulation pump 28, ultrasonic oscillator, liquid level detector 19, temperature sensor 26, and drying blower 80 are connected to the controller. The controller then attempts to clean the objects to be cleaned in the cleaning tank 4 according to a predetermined procedure (program). At this time, it is possible to perform at least the shower cleaning operation described below.

[0035] In the shower washing operation, liquid L is stored in the liquid reservoir 5, and the liquid L is circulated and supplied to the washing nozzle 6 by the circulation means 11, and then sprayed onto the object to be washed from the washing nozzle 6. Specifically, first, water is supplied to the liquid reservoir 5 by the water supply means 7 until the liquid level detector 19 detects the set water level. Later, when the circulation pump 28 is activated, the water level will drop, so the set water level at the time of initial water supply may be above the liquid reservoir 5.

[0036] After supplying water to the liquid storage section 5, the chemical solution supply means 9 is used to add the desired chemical solution to the liquid storage section 5 as needed. The amount of chemical solution supplied by the chemical solution supply means 9 is added in order to achieve the set concentration in relation to the water supplied by the water supply means 7. Furthermore, the heating means 10 is used to heat the water stored in the liquid storage section 5 to the set temperature as needed. The addition of the chemical solution and the heating of the stored water may be performed not only before the operation of the circulation means 11, but also during the operation of the circulation means 11.

[0037] In any case, with the desired amount of liquid L stored in the liquid storage section 5, the circulation pump 28 is activated to supply the stored liquid to the cleaning nozzles 6 via the circulation pipe 27 and cleaning arm 14, and spray it, cleaning the object to be cleaned while rotating the cleaning nozzles 6. The liquid L sprayed from each cleaning nozzle 6 is then returned to the liquid storage section 5 at the bottom of the cleaning tank 4. When a predetermined termination condition (for example, the elapsed of a set time) is met, the circulation pump 28 is stopped and the liquid L in the liquid storage section 5 is discharged by the drainage means 8.

[0038] Typically, this shower washing operation is repeated to wash and rinse the object to be washed. For example, a preliminary wash with room temperature water L without any chemicals is performed, followed by a main wash (typically multiple times) with warm water L to which detergent or other chemicals are added as desired, and a rinsing wash (typically multiple times) with warm water L to which a rinsing agent is added as desired. After the washing or rinsing operation is completed, a drying operation is performed to dry the object to be washed by driving the drying blower 80 as needed.

[0039] Next, with reference to Figures 2 to 4, we will explain the washing rack 2 and other components in the washing machine 1 in more detail.

[0040] Figure 2 is a schematic perspective view showing the cleaning rack 2 of this embodiment. Figure 3 is a diagram showing a part of the cleaning rack 2 when it is stored inside the cleaning tank 4, and is a schematic front view showing the connection between the water passage duct 15 of the cleaning tank 4 and the water distribution member 13 of the cleaning rack 2, and the mounting state of the cleaning nozzle 6 to the water distribution member 13, with a part cut out to show a cross-section. Furthermore, Figure 4 is an exploded perspective view showing the mounting structure of the cleaning nozzle 6 to the water distribution member 13.

[0041] In Figure 2, the washing rack 2 is roughly cubic, and with the lower right side as the front. The washing rack 2 is equipped with roughly rectangular frames 31 on the left and right sides, and multiple shelves 3 are provided vertically, spanning between these frames 31. Specifically, the left and right frames 31 are formed as a roughly rectangular shape by an upper piece 32 that extends horizontally in the front-to-back direction, front and rear pieces 33 that extend downward from each of the front and rear ends of the upper piece 32, and a lower piece 34 that connects the lower ends of the front and rear pieces 33. The left and right frames 31 are connected by appropriate upper members 35 at the upper pieces 32, while the lower pieces 34 are also connected by appropriate lower members (in this case, the lowest shelf 3). As a result, the washing rack 2 is configured as a roughly cubic shape. Multiple wheels 36 are provided on the lower pieces 34 of the left and right frames 31 at intervals from front to back. By moving these wheels 36 along the bottom (or rails) of the washing tank 4, the washing rack 2 can be easily moved in and out of the washing tank 4.

[0042] The washing rack 2 is equipped with shelves 3 in multiple tiers (five tiers in the illustrated example). Specifically, roughly rectangular shelves 3 are held horizontally, spanning the left and right frames 31. Each shelf 3 is constructed by assembling rods in a grid pattern, but may also be constructed from mesh material or perforated metal depending on the circumstances.

[0043] As mentioned above, a cleaning nozzle 6 is rotatably mounted at the bottom of each shelf 3. Specifically, a water distribution member 13 is provided along the vertical direction on one side of the central part in the front-to-back direction of the cleaning rack 2, and the cleaning nozzle 6 is mounted on this water distribution member 13 via a cleaning arm 14. In Figure 2, a square pipe-shaped water distribution member 13 is fixed to the left frame 31 along the vertical direction, and cleaning arms 14 are provided at multiple locations above and below the water distribution member 13 (a predetermined distance below each shelf 3, excluding the bottom shelf). The base end (left end) of each cleaning arm 14 is detachably connected to the water distribution member 13, and the tip (right end) extends to the center in the left-to-right direction of the cleaning rack 2. The longitudinal center of the cleaning nozzle 6 is rotatably held at the extended tip.

[0044] As shown in Figures 3 and 4, the cleaning arm 14 in this embodiment is a hollow member in the shape of a square pipe with a substantially rectangular cross-section. The cleaning arm 14 is positioned with its longitudinal dimension facing left to right in the cleaning rack 2 direction, and its short dimension (width dimension) facing front to back. Furthermore, the thickness dimension in the vertical direction is preferably formed to be shorter than the short dimension in the front to back direction. Here, the terms left to right direction, front to back direction, and vertical direction refer to the front view when the lower right surface of the substantially cubic cleaning rack 2 in Figure 2 is considered the front.

[0045] The hollow hole 37 of the cleaning arm 14 is open at the base end (left end) and closed at the tip end (right end) by the end wall 38 (see Figure 3). A cylindrical portion 41 is formed protruding from the upper wall 39 (or lower wall 40) of the tip of the cleaning arm 14, and the hollow portion (hollow hole 37) inside the cleaning arm 14 is opened through the hollow hole 42 of this cylindrical portion 41 (see Figure 4). On the other hand, the cleaning nozzle 6 is formed from an elongated hollow member and has multiple nozzle holes 16 formed therein. Furthermore, a circular ring mounting hole 45 is formed in the lower wall 43 (or upper wall 44) of the longitudinal center of the cleaning nozzle 6, and an annular mouth ring 46 made of synthetic resin (for example, fluororesin) is fitted into this ring mounting hole 45.

[0046] Preferably, the flow path cross-sectional area of ​​the hollow hole 37 of the cleaning arm 14 (the flow path cross-sectional area perpendicular to the axial direction of the cleaning arm 14) is formed to be larger than the flow path cross-sectional area of ​​the hollow hole 73 of the cleaning nozzle 6 (the flow path cross-sectional area perpendicular to the axial direction of the cleaning nozzle 6). This allows the liquid supplied from the cleaning arm 14 to the cleaning nozzle 6 via the cylindrical portion 41 to be forcefully ejected from the nozzle hole 16 of the cleaning nozzle 6.

[0047] The cleaning arm 14 has a shaft portion 47 protruding along the axis of the cylindrical portion 41, while the cleaning nozzle 6 has a cylindrical portion 481 protruding along the axis of the ring mounting hole 45. When assembling the cleaning nozzle 6 to the cleaning arm 14, the cylindrical portion 481 is rotatably fitted onto the shaft portion 47. The cylindrical portion 481 is part of the cleaning nozzle component 48, which will be described later.

[0048] In Figure 3, the shaft portion 47 protrudes upward from the lower wall 40 of the tip of the cleaning arm 14 (protruding above the cylindrical portion 41 of the upper wall 39), and the cylindrical portion 481 protrudes downward from the upper wall 44 of the cleaning nozzle 6 (protruding below the ring mounting hole 45 of the lower wall 43), with the cylindrical portion 481 rotatably fitted onto the shaft portion 47.

[0049] The cylindrical portion 481 is fitted onto the shaft portion 47, thereby rotatably holding the cleaning nozzle 6 relative to the cleaning arm 14. In this way, the cleaning nozzle member 48 having the cylindrical portion 481 together with the shaft portion 47 constitutes a rotation holding mechanism RH. This rotation holding mechanism RH makes it possible to rotate the cleaning nozzle 6 by allowing the cylindrical portion 481 to rotate while sliding against the shaft portion 47.

[0050] Furthermore, because the cleaning nozzle 6 is rotatable relative to the cleaning arm 14, a small gap may occur between the cylindrical portion 41 of the cleaning arm 14 and the mouth ring 46 of the cleaning nozzle 6. Taking this into consideration, the mouth ring 46 is configured to minimize liquid leakage to the outside through this gap.

[0051] A connecting member 49 is fixed to the base end of the cleaning arm 14. The connecting member 49 is formed by bending a roughly rectangular metal plate into a roughly U-shape, so that connecting pieces 51 are connected to both sides in the width direction of the central piece 50. In this case, the pair of connecting pieces 51 are positioned roughly perpendicular to the plate surface of the central piece 50. The distance between the connecting pieces 51 also roughly corresponds to the front-to-back width dimension of the water distribution member 13.

[0052] The base end of the cleaning arm 14 is fixed to the center of the plate surface of the central piece 50 (the side opposite to the extending side of the connecting piece 51). An opening 52 is formed in the central piece 50 at a position corresponding to the hollow hole 37 of the cleaning arm 14. In other words, the opening 52 of the central piece 50 and the hollow hole 37 of the cleaning arm 14 are basically the same size and are arranged continuously. Therefore, in the following explanation, the two will not be distinguished, and when referring to the hollow hole 37 of the cleaning arm 14, it will also include the opening 52 of the central piece 50 of the connecting member 49.

[0053] The connecting pieces 51 of the connecting member 49 are provided at both ends in the width direction of the central piece 50 (the front and rear ends in the short direction of the cleaning arm 14) and extend toward the base end side of the cleaning arm 14 (left side in Figures 3 and 4) substantially perpendicular to the central piece 50. An engagement groove 53 is formed in each connecting piece 51. The engagement groove 53 is formed by opening at the end edge of the connecting piece 51 (the end edge extending from the central piece 50) and being cut out in a substantially L shape. As a result, a downward-facing substantially U-shaped engagement portion 54 is formed at the upper end of each connecting piece 51.

[0054] On the other hand, the water distribution member 13 has an opening 56 formed on the connection surface (right side in Figures 3 and 4) 55 with the cleaning arm 14. This opening 56 is approximately rectangular in shape. In addition, pin-shaped engaging portions 58 are provided on both side walls (front and rear side walls) 57 in the width direction of the water distribution member 13, protruding outward in the width direction (outward in the front and rear direction). The thickness of this engaging portion (pin) 58 is approximately the same as the groove width of the engaging portion (approximately U-shaped groove) 54 of the connecting piece 51. By hooking the engaging portion 54 of the connecting piece 51 of the cleaning arm 14 onto the engaging portion 58 of the water distribution member 13, the cleaning arm 14 can be attached and detached to the water distribution member 13 without tools. When the cleaning arm 14 is connected to the water distribution member 13, it is preferable that the axes of the opening 56 of the water distribution member 13 and the hollow hole 37 of the cleaning arm 14 coincide. In any case, when the cleaning arm 14 is connected to the water distribution member 13, the connection surface (central piece 50) of the cleaning arm 14 is positioned so that it overlaps with the connection surface 55 of the water distribution member 13, and the opening hole 56 of the water distribution member 13 and the hollow hole 37 of the cleaning arm 14 are in communication.

[0055] Incidentally, an opening 60 for water supply from the water passage duct 15 of the washing tank 4 is formed on the outer surface (left side in Figure 3) 59 of the water distribution member 13. In Figure 2, the water distribution member 13 has openings 60 at two locations, top and bottom. At that time, as shown in Figure 3, a roughly rectangular plate-shaped rack joint 61 made of synthetic resin (for example, polyacetal) is provided on the water distribution member 13 via a packing 62, and openings 63 are also formed on these members 61 and 62.

[0056] On the other hand, a rectangular pipe-shaped water passage duct 15 is provided along the vertical direction on one side wall (left side wall) of the washing tank 4, and an opening hole 64 for supplying water to the water distribution member 13 is formed in this water passage duct 15. In the illustrated example, the water passage duct 15 has opening holes 64 at two locations, upper and lower, at heights corresponding to the water distribution member 13. At that time, a thick-walled cylindrical duct joint 65 made of synthetic resin (for example, polyacetal) is provided in the water passage duct 15 via an annular packing 66, and an opening hole 67 is also formed in the duct joint 65.

[0057] When the cleaning rack 2 is pushed into the cleaning tank 4 to its predetermined position, the cleaning rack 2 is biased to the left by a biasing means (for example, a leaf spring) built into the right side wall of the cleaning tank 4. In this state, the end faces of the duct joint 65 of the water passage duct 15 and the rack joint 61 of the water distribution member 13 come into contact, and the openings 63 and 67 of the joints 61 and 65 are connected. If the duct joint 65 is provided to be slightly oscillating due to the elasticity of the packing 66, the watertight connection between the duct joint 65 and the rack joint 61 can be made even more reliable. With the cleaning rack 2 stored in the cleaning tank 4, when the circulation pump 28 is operated as a shower cleaning operation, liquid L from the liquid storage section 5 is supplied from the water passage duct 15 to the water distribution member 13 and then to the cleaning nozzle 6 via the cleaning arm 14, and can be sprayed from the nozzle hole 16 of the cleaning nozzle 6.

[0058] Incidentally, Figures 3 and 4 show one of the cleaning nozzles 6 that are provided in multiple vertical rows on the cleaning rack 2, but the same applies to the cleaning nozzles 6 in other locations. Also, in Figure 1, the uppermost and lowermost cleaning nozzles 6 are provided in the cleaning tank 4 itself, but the structure for attaching and detaching the cleaning nozzles 6 to and from the cleaning tank 4 via the cleaning arms 14 can be the same. Furthermore, the mounting structure for the cleaning nozzles 6 to each cleaning arm 14 can also be the same, and in that case, the connection part can be configured as shown in Figure 12.

[0059] Furthermore, in Figures 3 and 4, the cleaning nozzle 6 is rotatably held on the upper wall 39 of the cleaning arm 14, but in some cases, the cleaning nozzle 6 may be rotatably held on the lower wall 40 of the cleaning arm 14. For example, in Figure 1, the cleaning nozzle 6 installed at the uppermost level in the cleaning tank 4 is rotatably held on the lower wall 40 of the tip of the cleaning arm 14.

[0060] When the cleaning nozzle 6 is held on the lower wall 40 of the cleaning arm 14, a cylindrical portion 41 protruding downward can be formed on the lower wall 40 of the cleaning arm 14. On the other hand, a ring mounting hole 45 is formed on the upper wall 44 of the cleaning nozzle 6, and a mouth ring 46 similar to the one described above is fitted into this ring mounting hole 45. Then, the mouth ring 46 of the cleaning nozzle 6 is fitted into the cylindrical portion 41 of the cleaning arm 14, and the cleaning nozzle 6 is rotatably held on the cleaning arm 14.

[0061] Furthermore, while the washing rack 2 (and washing tank 4) is equipped with washing nozzles 6 in multiple vertical rows, the washing arms 14 are detachable from the water distribution member 13, so the washing arms 14 and washing nozzles 6 can be easily cleaned by removing the washing arms 14 from the water distribution member 13. In addition, the washing rack 2 may be configured so that shelves 3 are detachable from the left and right frames 31 (in other words, the number of shelves 3 can be changed), in which case the number and position of the shelves 3 should be changed according to the size of the object to be washed. At that time, the washing nozzles 6 corresponding to the removed shelves 3 should also be removed. The openings 56 of the water distribution member 13 where washing nozzles 6 are not installed can be sealed with a sealing material. The sealing material is a component with the same configuration as the connecting member 49, and instead of the washing arms 14 being installed, the openings 56 are not formed (i.e., sealed).

[0062] 2. Configuration of components for the cleaning nozzle, etc. Next, the configuration of the cleaning nozzle member 48 having a cylindrical portion 481 will be described in detail with reference to Figures 5 to 8. Figure 5 shows a front view of the cleaning nozzle member 48, and Figures 6 and 7 show perspective views of the cleaning nozzle member 48 viewed from different directions. Figure 8 shows a perspective view of the cleaning nozzle member 48 when cut by a plane containing the central axis (the dashed line X shown in Figure 5).

[0063] As shown in Figures 5 to 8, the cleaning nozzle member 48 has a cylindrical portion 481, a flange portion 482, a communication hole 483, a first auxiliary hole 484a, a fixing hole 485, and a protruding portion 486. The basic shape of the cleaning nozzle member 48, excluding the holes, is a rotating body based on a central axis extending vertically.

[0064] The cylindrical portion 481 is formed in a cylindrical shape with holes, and the shaft portion 47 is fitted inside it and rotates while sliding with the shaft portion 47. The flange portion 482 is formed to protrude radially from the entire circumference of the axial upper end of the cylindrical portion 481 and is used to fix it to the cleaning nozzle 6. The protruding portion 486 is formed to protrude upward from a region near the center when viewed from above of the flange portion 482.

[0065] The cylindrical portion 481 is provided with a plurality of communication holes 483 (through holes extending radially) that connect the outside and the inside to allow liquid L to pass through. More specifically, the cylindrical portion 481 is provided with a first group of communication holes 483X (see Figure 5 in particular) in which a plurality of communication holes 483 (15 in this embodiment, at equal intervals) are arranged in the axial direction. Furthermore, adjacent communication holes 483 in the first group of communication holes 483X are connected to each other by a first auxiliary hole 484a (see Figure 8 in particular) that extends in the axial direction to allow liquid L to pass through.

[0066] Multiple such first communication hole groups 483X are provided in the circumferential direction of the cylindrical portion 481 (in this embodiment, 12 holes at 30° intervals). As shown in Figure 8, each first auxiliary hole 484a is provided so as to penetrate axially at the central position between the inner and outer surfaces of the cylindrical portion 481. As shown in Figure 5, it can also be seen that the cylindrical portion 481 has multiple second communication hole groups 483Y arranged in the circumferential direction, with multiple communication holes 483 arranged in the axial direction. In addition, the flange portion 482 has two fixing holes 485 that penetrate axially, each positioned opposite the central axis.

[0067] Regarding the main dimensions of the cleaning nozzle component 48, in this embodiment, the length L1 from the upper end of the flange portion 482 to the lower end of the cylindrical portion 481 is 34 mm, the thickness T1 of the flange portion 482 is 3 mm, and the thickness of the protruding portion 486 is 1 mm. The outer diameter D1 of the cylindrical portion 481 is 14 mm, the outer diameter D2 of the flange portion 482 is 35 mm, and the outer diameter D3 of the protruding portion 486 is 17.9 mm. The inner diameter of the cylindrical portion 481 is appropriately set so that the cylindrical portion 481 can rotate while sliding with the shaft portion 47, and in this embodiment, it is set to 8.1 mm. The inner diameters of the flange portion 482 and the protruding portion 486 are the same as the inner diameter of the cylindrical portion 481.

[0068] The diameters of the communication holes 483 and the first auxiliary holes 484a are appropriately set so as to allow the liquid L to pass through smoothly without compromising the necessary strength of the cylindrical portion 481, and are preferably set within the range of 0.5 to 1.5 mm. In this embodiment, the diameter is set to 1 mm. Furthermore, the spacing (pitch) of the communication holes 483 in the first communication hole group 483X is preferably at least twice the diameter of the communication holes 483, and in this embodiment, it is set to 2.88 mm.

[0069] The cleaning nozzle component 48 can be formed by manufacturing methods such as 3D printing or machining, and its material can be a resin, metal, or ceramic that can be used in such manufacturing methods. For example, the resin can be polyacetal (POM) resin, polyphenylene sulfide (PPS) resin, or epoxy resin, and the metal can be SUS316L, TAB6400, or AlSi10Mg. Furthermore, various methods can be used to form the cleaning nozzle component 48, and for example, additive processing can be done using a 3D printer (e.g., PBF method or VPP method), and subtractive processing can be done using a drill, machining, or laser processing.

[0070] Furthermore, in the second group of communication holes 483Y (see Figure 5), in which multiple communication holes 483 are arranged in the circumferential direction, adjacent communication holes 483 may be connected to each other by a second auxiliary hole 484b extending in the circumferential direction, allowing liquid L to pass through. A perspective view of the cleaning nozzle member 48 in this case (a perspective view when cut in a plane including the central axis) is illustrated in Figure 9. In the example shown in Figure 9, all adjacent communication holes 483 in the second group of communication holes 483Y are connected to each other by the corresponding second auxiliary hole 484b. The second auxiliary hole 484b shown in Figure 9 has a hole diameter equivalent to that of the communication hole 483 and is provided to extend 360° in the circumferential direction and penetrate at the central position between the inner and outer surfaces of the cylindrical portion 481.

[0071] Furthermore, various configurations can be adopted for the arrangement pattern of the communication holes 483 in the cylindrical portion 481, as long as they do not depart from the spirit of the present invention. For example, the arrangement pattern of the communication holes 483 may be staggered, as shown in the perspective views (perspective views when cut along a plane including the central axis) shown in Figures 10 and 11. The cleaning nozzle member 48 shown in Figures 10 and 11 is provided with a first auxiliary hole 484a and a second auxiliary hole 484b, similar to the cleaning nozzle member 48 shown in Figure 11.

[0072] Figure 12 is a schematic longitudinal cross-sectional view showing an enlarged view of the rotation holding mechanism RH and its vicinity. As shown in this figure, the flange portion 482 of the cleaning nozzle member 48 is used to fix it to the upper wall 44 of the cleaning nozzle 6. More specifically, a bolt 83 is passed through a hole and a fixing hole 485 provided in the upper wall 44, and the flange portion 482 is fixed to the upper wall 44 by screwing the bolt 83 and a nut 84 together. Note that the specific method for fixing the cleaning nozzle member 48 to the cleaning nozzle 6 is not particularly limited, and other methods may be used.

[0073] Furthermore, with the cleaning nozzle member 48 (cylindrical portion 481) fitted onto the shaft portion 47, a knurled screw 81 is screwed onto the upper part of the shaft portion 47, thereby preventing the cleaning nozzle member 48 from disengaging from the shaft portion 47. A spacer 82 is positioned between the flange portion of the knurled screw 81 and the upper part of the cleaning nozzle member 48. The surface of the spacer 82 is formed to be smooth, so as not to hinder the smooth rotation of the cleaning nozzle 6 as much as possible.

[0074] The rotation-holding mechanism RH (particularly the outer surface of the cylindrical portion 481 of the cleaning nozzle member 48) is exposed to the liquid L path inside the cleaning arm 14 and cleaning nozzle 6. When liquid L is supplied to the cleaning nozzle 6 via the cleaning arm 14, the liquid L comes into contact with the rotation-holding mechanism RH. In this way, the cleaning device 1 is configured to circulate liquid L from the cleaning arm 14 to the cleaning nozzle 6 through a path that comes into contact with the rotation-holding mechanism RH.

[0075] Therefore, a portion of this liquid L enters the communication hole 483 which is open on the outer surface of the cylindrical portion 481 and reaches the inner surface of the cylindrical portion 481 (the sliding surface between the cylindrical portion 481 and the shaft portion 47). As a result, the liquid L acts as a lubricant to smooth the sliding between the cylindrical portion 481 and the shaft portion 47, contributing to ensuring the smooth rotation of the cleaning nozzle 6.

[0076] Furthermore, since multiple communication holes 483 are provided in both the axial and circumferential directions of the cylindrical portion 481, it is possible to more reliably guide the liquid L to the inner surface of the cylindrical portion 481. In addition, in this embodiment, it is also possible to circulate the liquid L that enters through any of the communication holes 483 in the axial direction via the first auxiliary hole 484a, making it easier to guide the liquid L more evenly to the inner surface of the cylindrical portion 481. Moreover, with the cleaning nozzle member 48 (see Figure 9) provided with the aforementioned second auxiliary hole 484b, it is also possible to circumferentially circulate the liquid L that enters through any of the communication holes 483 via the second auxiliary hole 484b. Therefore, it becomes even easier to guide the liquid L more evenly to the inner surface of the cylindrical portion 481.

[0077] Furthermore, during the drying operation of the cleaning machine 1, a portion of the hot air (drying air) from the drying blower 80 flows from the outer surface of the cylindrical portion 481 through the communication hole 483 into the inner surface of the cylindrical portion 481 (the sliding surface between the cylindrical portion 481 and the shaft portion 47). As a result, this drying air supports the rotation of the cleaning nozzle 6 by the air pressure between the cylindrical portion 481 and the shaft portion 47.

[0078] 3. About the evaluation test To evaluate the performance of the cleaning nozzle member 48 according to this embodiment (particularly the sliding properties of the cylindrical portion 481), the evaluation tests described below were conducted.

[0079] For the evaluation test, cleaning nozzle components for the Example (corresponding to this embodiment), Comparative Example 1, and Comparative Example 2 were prepared. The cleaning nozzle component for the Example was made of PPS resin (polyphenylene sulfide resin), and its shape was the same as the cleaning nozzle component 48 of this embodiment (shown in Figures 5 to 8).

[0080] The cleaning nozzle component of Comparative Example 1 is made of PTFE resin (polytetrafluoroethylene resin), and its shape is the same as that of the cleaning nozzle component 48 of this embodiment, but without all of the communication holes 483 and the first auxiliary hole 484a.

[0081] The cleaning nozzle component of Comparative Example 2 is made of PPS resin, and its shape is the same as that of the cleaning nozzle component 48 of this embodiment, but with all the outer ends of the communication holes 483 (the outer ends of the cylindrical portion 481) closed.

[0082] Furthermore, the PPS resin material used in the Examples and Comparative Example 2 has higher hardness than the PTFE resin material used in Comparative Example 1. While this reduces uneven wear when used in the cleaning nozzle component, there is a concern that the cleaning nozzle 6 may become difficult to rotate (a decrease in the sliding properties of the cylindrical portion 481). In view of this, if the ease of rotation of the cleaning nozzle 6 in the Examples is the same as or better than that of Comparative Example 1, then the shape of the cleaning nozzle component 48 in this embodiment can be said to have superior sliding properties of the cylindrical portion 481 compared to one without the communication hole 483 and the first auxiliary hole 484a.

[0083] The evaluation test involved using a washing machine 1 to which one of the washing nozzle components 48 from Example, Comparative Example 1, or Comparative Example 2 was applied. After performing one rinse cycle with room temperature water, the temperature inside the washing tank 4 was controlled to 60°C or 130°C by a drying cycle, and the time required to rotate the washing nozzle 6 five times was measured. A shorter measured time indicates that the washing nozzle 6 rotates more easily and that the sliding properties of the cylindrical portion 481 are superior.

[0084] The table in Figure 13 shows the test conditions and results for each evaluation test conducted for Tests No. 1 to 19. According to this table, for example, in Test No. 1, the cleaning nozzle component of "Comparative Example 1" was applied, and the evaluation test was conducted with the temperature inside the cleaning tank 4 controlled to "60°C". The result showed that it took "19 seconds" to rotate the cleaning nozzle 6 five times. For Tests No. 17 to 19, the time required to rotate the cleaning nozzle 6 five times was measured 10 minutes after the temperature inside the cleaning tank 4 reached 130°C.

[0085] As shown in the table in Figure 13, the time required to rotate the cleaning nozzle 6 five times was approximately the same for both the embodiment and Comparative Example 1. This confirms that the shape of the cleaning nozzle member 48 in this embodiment provides superior sliding performance of the cylindrical portion 481 compared to those without the communication hole 483. In Comparative Example 2, however, the time required to rotate the cleaning nozzle 6 five times increased compared to the embodiment and Comparative Example 1. This phenomenon is presumed to be due to the use of PPS resin as the material, as well as the fact that the outer end of the communication hole 483 is closed, which hinders the entry of liquid L into the cylindrical portion 481.

[0086] 4. Summary As described above, the cleaning nozzle member 48 (an example of a spray nozzle member) of this embodiment is provided on the cleaning nozzle 6 and constitutes the rotation holding mechanism RH together with the shaft portion 47 in a cleaning device 1 (an example of a device equipped with the sprayer) which includes a cleaning arm 14 (an example of an arm portion) on which a shaft portion 47 is provided, and a cleaning nozzle 6 (an example of a spray nozzle) which is rotatably held on the cleaning arm 14 by a rotation holding mechanism RH, and which facilitates the flow of liquid L from the cleaning arm 14 to the cleaning nozzle 6 via a path in contact with the rotation holding mechanism RH. Furthermore, the cleaning nozzle member 48 has a cylindrical portion 481 into which the shaft portion 47 is fitted and which rotates while sliding with the shaft portion 47, and the cylindrical portion 481 is provided with a communication hole 483 that connects the outside and the inside to allow liquid L to pass through.

[0087] Therefore, the cleaning nozzle member 48 makes it possible to make the sliding between the shaft portion 47 and the cylindrical portion 481 used in the rotation holding mechanism RH of a rotary nozzle type sprayer smoother. The spray nozzle member according to the present invention is not limited to the cleaning nozzle member as in this embodiment, but can be used as a member provided on the spray nozzle and constituting the rotation holding mechanism together with the shaft portion in sprayers for various applications in which liquid is circulated from the arm portion to the spray nozzle via a path in contact with the rotation holding mechanism.

[0088] It should be noted that the above embodiments are illustrative in all respects and not restrictive. The technical scope of the present invention is indicated by the claims rather than by the above descriptions of embodiments, and should be understood to include all modifications that fall within the meaning and scope equivalent to the claims.

[0089] 5. Other application examples The spray nozzle component and the sprayer equipped therewith according to the present invention can be applied not only to cleaning devices but also to liquid film type steam generators and cooling devices. In a liquid film type steam generator, waste hot water (for example, jacket cooling water for a gas engine generator) is circulated through horizontally arranged heat transfer tubes, while water is sprayed onto the surface of the heat transfer tubes from a rotating nozzle type sprayer. This creates a uniform liquid film on the surface of the heat transfer tubes, enabling efficient steam generation. In a liquid film type cooling device, cooling water is sprayed onto the object to be cooled in the cooling tank (for example, heat-sterilized packaged food) from a rotating nozzle type sprayer. This allows the object to be cooled to be rapidly cooled by utilizing the heat of vaporization of the cooling water.

[0090] <Contribution to the United Nations-led Sustainable Development Goals (SDGs)> The nozzle component for injection described herein can significantly extend the lifespan of the rotation holding mechanism in a rotary nozzle type injector. Therefore, industrial machinery equipped with injection nozzles is expected to have a longer service life from installation to disposal. This can contribute to solving the problem of SDG (Sustainable Development Goal) Goal 12, "Responsible Consumption and Production." [Industrial applicability]

[0091] This invention can be used in sprayers and the like that which eject liquids. [Explanation of symbols]

[0092] 1. Washer 2 Washing racks 3 shelves 4. Washing tank 5. Liquid storage section 6. Cleaning nozzle 7 Water supply means 8 Drainage means 9. Drug supply means 10 Heating means 11 Circulation means 12 Slope 13 Water distribution components 14 Washing Arm 15 Water supply duct 16 nozzle holes 17 Water supply channel 18 Water supply valve 19 Liquid level detector 20 Drainage Channel 21 Drain valve 22 Chemical tanks 23 Liquid supply path 24 Chemical pump 25 Heater 26 Temperature Sensor 27 Circulation piping 28 Circulation pump 29 Check valve 30 Ultrasonic transducers 31 Frame 32 Top piece 33 Front and rear pieces 34 Lower piece 35 Top material 36 wheels 37 Hollow hole (of the washing arm) 38 End wall (of the washing arm) 39 Upper wall (of the washing arm) 40 (Lower wall of the washing arm) 41 Cylindrical section 42 Hollow hole (in the cylindrical part) 43 Lower wall (of the cleaning nozzle) 44 (Upper wall of the cleaning nozzle) 45 ring mounting holes 46 Mouse Rings 47 Shaft section 48 Cleaning nozzle components 481 Cylindrical part 482 Flange section 483 Communication hole 483X 1st communication hole group 483Y 2nd communication hole group 484a 1st auxiliary hole 484b 2nd auxiliary hole 485 Fixing hole 486 Protrusion 49 Connecting Member 50 center piece 51 connecting piece 52 Opening hole (of the central piece of the connecting member) 53 Engagement groove 54 Engagement part 55 Connection surface (of water distribution component) 56 (Opening hole of water distribution member) 57 (Width-direction side walls of the water distribution member) 58 Engaged portion 59 (Outer surface of the water distribution member) 60 (Opening hole of water distribution member) 61 Rack joint 62 Packing 63 (Opening holes for rack joints) 64 (Opening hole for water duct) 65 Duct joint 66 Packing 67 (Opening hole for duct joint) 73 Hollow hole (of the cleaning nozzle) 80 Drying blower

Claims

1. In a sprayer comprising an arm portion on which a shaft portion is provided, and a spray nozzle rotatably held in the arm portion by a rotation holding mechanism, wherein liquid is circulated from the arm portion to the spray nozzle via a path in contact with the rotation holding mechanism, the spray nozzle member provided in the spray nozzle and constituting the rotation holding mechanism together with the shaft portion, It has a cylindrical part inside which the shaft is fitted and which rotates while sliding against the shaft, The cylindrical portion is a spray nozzle member provided with a communication hole that connects the outside and the inside to allow the liquid to pass through.

2. The cylindrical portion is provided with a first group of communication holes arranged in the axial direction, The spray nozzle member according to claim 1, wherein adjacent communication holes in the first group of communication holes are connected by a first auxiliary hole extending in the axial direction to allow the liquid to pass through.

3. The injection nozzle member according to claim 2, wherein the cylindrical portion is provided with a plurality of the first group of communication holes in the circumferential direction.

4. The cylindrical portion is provided with a second group of communication holes arranged in the circumferential direction, The spray nozzle member according to claim 1, wherein adjacent communication holes in the second group of communication holes are connected by a second auxiliary hole extending in the circumferential direction to allow the liquid to pass through.

5. The injection nozzle member according to claim 4, wherein the cylindrical portion is provided with a plurality of the second group of communication holes in the axial direction.

6. A flange portion is provided at one axial end of the cylindrical portion, which protrudes radially. The injection nozzle member according to claim 1, wherein the flange portion is used for fixing to the injection nozzle.

7. An injector comprising an arm portion on which a shaft portion is provided, and an injection nozzle rotatably held in the arm portion by a rotation holding mechanism, wherein liquid is circulated from the arm portion to the injection nozzle via a path in contact with the rotation holding mechanism, A sprayer having a spray nozzle member according to any one of claims 1 to 6, which is provided on the spray nozzle and, together with the shaft portion, constitutes the rotation holding mechanism.

8. A cleaning device equipped with the sprayer described in claim 7, It is equipped with a washing tank in which the objects to be washed are contained, The arm portion and the spray nozzle are provided inside the cleaning tank. The injection nozzle sprays the liquid while rotating, A cleaning device that cleans the object to be cleaned by applying the sprayed liquid.

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