Pipe faucet

Abstract

To suppress outflow of a solid to a downstream side of a pipe opening faucet.SOLUTION: A pipe opening faucet 10 comprises: a pipe-like member 11 including a first opening 20a in an end; and a lid member 12 for switching a cut-off state in which the first opening 20a is closed and a circulation state in which the first opening 20a is opened. The pipe opening faucet 10 comprises a filter 13 which is removably mounted to the first opening 20a by being inserted into the first opening 20a and rotated. The filter 13 includes a disk-like filter main body 50 and a plurality of protrusions 53 protruding from an outer periphery of the filter main body 50. A groove part A into which the protrusion 53 is inserted is provided on an inner peripheral surface of the first opening 20a. The groove part A includes: a circumferential groove A1 including a first sidewall 25a and a second sidewall 31 extending in a circumferential direction and opposed in an axial direction of the pipe-like member 11; and an insertion groove A2 communicating an end of the first opening 20a with the circumferential groove A1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a pipe mouth faucet. [Background technology]

[0002] A pipe mouth faucet is a water gate attached to the inlet or outlet end of a water pipe, such as a supply channel that supplies water from an irrigation canal to a rice field or a discharge channel that discharges water from a rice field to an irrigation canal. The pipe mouth faucet disclosed in Patent Document 1 includes a tubular member attached to the water pipe and a cover member that switches between a water-stopping state in which the opening of the tubular member is closed and a flow-through state in which the opening is open. The cover member is rotatably fixed to a flange formed on the end of the tubular member with screws. This pipe mouth faucet can switch between a water-stopping state and a flow-through state by rotating the cover member relative to the tubular member. Furthermore, the amount of water passing through the pipe mouth faucet can be adjusted by adjusting the amount of rotation of the cover member to change the opening size of the opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Jikko No. 15473-1973 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional pipe mouth faucets had the problem that when the opening was opened to allow flow, solid matter flowing through the irrigation channel would flow into the rice fields, or solid matter such as the coating film of coated fertilizer used in rice fields would flow into the irrigation channel. [Means for solving the problem]

[0005] A pipe mouth faucet that solves the above problem is a pipe mouth faucet that comprises a tubular member having an opening at its end, and a cover member that switches between a water-stop state in which the opening is closed and a flow-through state in which the opening is open, and is equipped with a filter that can be removably attached to the opening by inserting it into the opening and rotating it, the filter comprising a disk-shaped filter body and a plurality of protrusions that protrude from the outer periphery of the filter body, and a groove portion into which the protrusions are inserted on the inner surface of the opening, the groove portion comprising a circumferential groove that extends circumferentially and has a first side wall and a second side wall that face each other in the axial direction of the tubular member, and an insertion groove that connects the end of the opening to the circumferential groove.

[0006] According to the above configuration, the filter attached to the opening of the tubular member captures solids that pass through the pipe mouth faucet. This prevents solids from flowing downstream from the pipe mouth faucet. The filter can be easily attached and detached from the tubular member by simply inserting it into the opening of the tubular member and rotating it, making maintenance such as cleaning and replacement of the filter easy.

[0007] The filter is fixed to the tubular member by positioning a protrusion protruding from the outer periphery of the filter body within a circumferential groove formed on the inner circumferential surface of the opening of the tubular member. In this case, the protrusion of the filter is sandwiched between the first and second side walls that form the groove and are opposed in the axial direction of the tubular member. Therefore, regardless of the direction of water pressure applied to the filter body (i.e., the direction of water flow in the axial direction of the tubular member), the filter can withstand water pressure by abutting the protrusion of the filter against the first or second side wall of the circumferential groove. Therefore, the filter can be stably held in the opening of the tubular member regardless of the fluid flow direction. This makes the filter applicable to both pipe inlet faucets attached to the inlet end of a water pipe and pipe outlet faucets attached to the outlet end of a water pipe.

[0008] In the above pipe mouth water plug, it is preferable that three or more of the protrusions are provided at rotationally symmetric positions on the outer periphery of the filter body. According to the above configuration, the load applied to the filter by water pressure is evenly distributed among the plurality of protrusions, thereby enabling the filter to be more stably held in the opening of the tubular member.

[0009] In the above-mentioned pipe mouth faucet, it is preferable that the total angular range in the axial direction over which the first side wall and the second side wall of the circumferential groove overlap with the protrusion in the circumferential direction of the outer periphery of the filter body is greater than or equal to 60 degrees and less than 180 degrees.

[0010] According to the above configuration, the first side wall and the second side wall of the circumferential groove support the protruding portion over a wide area, so that the filter can be more stably held in the opening of the tubular member. In the above-mentioned pipe mouth faucet, it is preferable that the tubular member comprises a tubular first member having protrusions on its inner surface that form the insertion groove and the first side wall, and a second member that is fixed to the inner surface of the first member and forms the second side wall, and that the groove portion is formed by the first member and the second member.

[0011] According to the above configuration, the groove can be easily provided on the inner circumferential surface of the opening. [Effects of the Invention]

[0012] According to the present invention, the outflow of solid matter to the downstream side of the pipe mouth plug can be suppressed. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of a pipe mouth faucet in a flow state. [Figure 2] FIG. 1 is a perspective view of a pipe mouth faucet with the filter removed. [Figure 3] FIG. [Figure 4] FIG. 4 is a cross-sectional view showing the relationship between a protrusion and a groove. [Figure 5] 5 is a cross-sectional view taken along line 5-5 in FIG. 4. [Figure 6] FIG. [Figure 7]FIG. 10 is a front view of a tubular member with a filter attached thereto. [Figure 8] FIG. 10 is a front view of a modified filter. [Figure 9] FIG. 10 is a front view of a modified filter. [Figure 10] 10A and 10B are explanatory diagrams of protrusions in a modified example. [Figure 11] FIG. 10 is a perspective view of a pipe mouth faucet in a flow state according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described below. The pipe mouth faucet 10 of this embodiment is an opening and closing device that is attached to the end of a water pipe (not shown) and adjusts the discharge of water from the water pipe or the flow of water into the water pipe.

[0015] 1 and 2, the pipe mouth faucet 10 comprises a tubular member 11, a cover member 12 that opens and closes the opening of the tubular member 11, and a filter 13 that is detachably attached to the opening of the tubular member 11. Note that the axial direction, circumferential direction, and radial direction described below refer to the respective directions based on the axis of the tubular member 11.

[0016] (Tubular member) As shown in FIG. 3 , the tubular member 11 is formed by combining a first member 20 and a second member 30. The first member 20 is a circular tube with a first opening 20a and a second opening 20b at both ends. The first member 20 is the portion into which a water pipe (not shown) is inserted and fits onto the outer circumferential surface of the water pipe. The shape of the inner circumferential surface of the first member 20 is formed to match the outer circumferential surface of the water pipe. As an example, this drawing shows a first member 20 with cylindrical inner and outer circumferential surfaces. In addition, a plurality of axially extending ridges 21 are formed at equal intervals around the circumferential direction on the outer circumferential surface of the first member 20. The ridges 21 reinforce the first member 20 and also function as a rotation restrictor that restricts rotation of the pipe mouth faucet 10 after installation.

[0017] An annular flange 22 that protrudes radially outward is provided at the end of the first member 20 on the side where the first opening 20a is located. The flange 22 has a through hole 23 for attaching the cover member 12. The outer surface of the flange 22 is provided with a rotation prevention portion 24 that protrudes outward. The rotation prevention portion 24 is configured to restrict rotation of the cover member 12 beyond a specific position.

[0018] 3 and 4, groove walls 25 that protrude radially outward and inward are formed on the inner circumferential surface of the first opening 20a of the first member 20. The groove walls 25 are L-shaped walls that include a first side wall 25a that extends circumferentially along the end of the first member 20 on the first opening 20a side, and an axial wall 25b that extends axially from one end of the first side wall 25a. The first member 20 includes four groove walls 25. The four groove walls 25 are arranged at equal intervals in the circumferential direction.

[0019] 3, the second member 30 is an annular member that is inserted into the first member 20 through the second opening 20b and fixed to the inner circumferential surface of the first member 20. The method for fixing the second member 30 to the first member 20 is not particularly limited, and known fixing methods such as adhesion and welding can be applied.

[0020] 3 to 5, the second member 30 includes a second side wall 31 and a support wall 32. The second side wall 31 is an annular wall that abuts against the axial wall 25b of the groove wall portion 25 in the first member 20 and faces the first side wall 25a of the groove wall portion 25 in the axial direction. The support wall 32 is an annular wall that protrudes radially inward from the second side wall 31. The support wall 32 is provided on the edge of the second side wall 31 on the side of the second opening 20b.

[0021] As shown in Figures 2 and 4, when the second member 30 is fixed to the first member 20, the groove wall portion 25 of the first member 20 and the second side wall 31 of the second member 30 form multiple groove portions A on the inner surface of the first opening 20a.

[0022] The groove portion A is an L-shaped groove including a circumferential groove A1 and an insertion groove A2. The circumferential groove A1 is a groove formed between the first side wall 25a and the second side wall 31 that face each other in the axial direction. In other words, the circumferential groove A1 is a groove that extends in the circumferential direction and has the first side wall 25a and the second side wall 31 that face each other in the axial direction. The insertion groove A2 is a groove that is formed between the circumferential ends of adjacent groove wall portions 25, and is a groove that communicates between the end of the first member 20 on the first opening 20a side and the circumferential groove A1.

[0023] (Cover member) 1 and 3, the cover member 12 is a plate-like member having a planar shape that is slightly larger than the first opening 20a of the first member 20. A through hole 12a is provided in the cover member 12. The cover member 12 is attached to the outer surface side of the flange 22 of the first member 20 by screwing together a bolt 40 and a nut 41 that are inserted into the through hole 12a of the cover member 12 and the through hole 23 of the flange 22 of the first member 20.

[0024] The cover member 12 is rotatable relative to the first member 20 around the bolt 40. By rotating the cover member 12 relative to the first member 20, the pipe mouth faucet 10 can be switched between a water-stopping state in which the cover member 12 closes the first opening 20a, and a flow-through state in which the first opening 20a is partially or completely open. The edge of the cover member 12 abuts against the anti-rotation portion 24 of the first member 20, preventing further rotation of the cover member 12 in the direction of switching from the flow-through state to the water-stopping state. In addition, an operating portion 12b is provided on the outer surface of the cover member 12 to be used as a knob when rotating the cover member 12.

[0025] (filter) As shown in FIG. 2, the filter 13 includes a disk-shaped filter body 50. The filter body 50 includes an annular frame 51 and a filter section 52 formed inside the frame 51. The outer diameter of the frame 51 is set to be slightly smaller than the inner diameter of the first opening 20a of the tubular member 11. The structure of the filter section 52 is set according to the size of solid matter that needs to be prevented from flowing out of or into the pipe mouth faucet 10, and is not particularly limited as long as it is a structure that restricts the passage of solid matter above a certain size while allowing the passage of water. As an example, the drawing shows a filter section 52 formed by a lattice-shaped wall.

[0026] The filter 13 has a plurality of protrusions 53 protruding from the outer peripheral surface of the frame 51 of the filter body 50. The protrusions 53 are ridges extending circumferentially along the outer peripheral surface of the frame 51. The circumferential length of the protrusions 53 is less than the circumferential length of the insertion groove A2 of the groove A. The thickness, which is the axial length of the protrusions 53, is less than the width of the circumferential groove A1 of the groove A, i.e., less than the distance between the first side wall 25a and the second side wall 31. On the outer periphery of the frame 51, the plurality of protrusions 53 are provided at positions that are rotationally symmetric when the filter 13 is rotated by a predetermined angle around the axial direction. The number of protrusions 53 provided on the filter 13 is the same as the number of grooves A provided on the first member 20.

[0027] The filter 13 is detachably attached to the first opening 20a of the tubular member 11 by inserting it into the first opening 20a of the tubular member 11 and rotating it so that the protrusion 53 is positioned within the groove A of the tubular member 11. The specific attachment method is as follows.

[0028] 2 and 4, the filter 13 is inserted into the first opening 20a of the tubular member 11 with the circumferential positions of the protrusions 53 of the filter 13 aligned with the circumferential positions of the insertion grooves A2 of the groove portion A of the tubular member 11. At this time, as shown in Fig. 4, the protrusions 53 of the filter 13 are inserted into the insertion grooves A2 of the groove portion A of the tubular member 11. Then, when the protrusions 53 of the filter 13 come into contact with the second side wall 31, the insertion of the filter 13 into the first opening 20a is stopped.

[0029] Next, the filter 13 inserted into the first opening 20a is rotated to one side in the circumferential direction. At this time, as shown in FIG. 4, the protrusion 53 of the filter 13 moves to one side in the circumferential direction within the circumferential groove A1 of the groove portion A of the tubular member 11. Then, when the protrusion 53 of the filter 13 abuts against the axial wall 25b of the groove wall portion 25, the rotation of the filter 13 in the first opening 20a is stopped. This attaches the filter 13 to the first opening 20a of the tubular member 11. Note that, to remove the filter 13, the above-described operation is performed in reverse. Note that, hereinafter, the state in which the filter 13 is attached to the tubular member 11 will be referred to as the attached state.

[0030] 4 and 5 , the protrusion 53 of the filter 13 in the attached state is sandwiched in the axial direction between the first side wall 25a and the second side wall 31 that form the groove A. Furthermore, the surface of the filter body 50 of the filter 13 located toward the axial center of the tubular member 11 abuts against the support wall 32 provided on the second member 30 of the tubular member 11. The filter 13 in the attached state is restricted from moving toward the axial center by the protrusion 53 abutting against the second side wall 31 and the filter body 50 abutting against the support wall 32. The filter 13 in the attached state is restricted from moving toward the axial end sides by the protrusion 53 abutting against the first side wall 25a.

[0031] (Dimensions of protrusions and grooves) 6, the circumferential length of the protrusion 53 is such that the central angle α formed between both circumferential ends of the protrusion 53 and the center P of the filter body 50 is, for example, 22 degrees or more and less than 90 degrees. Furthermore, the circumferential length of the protrusion 53 is preferably such that the central angle α is 30 degrees or more and less than 90 degrees.

[0032] The number of protrusions 53 of the filter 13 is set so that the circumferential length of each protrusion 53 is within the above-mentioned range and so that the protrusions 53 can be arranged at rotationally symmetric positions. The number of protrusions 53 of the filter 13 is, for example, 2 or more, and preferably 3 or more. The number of protrusions 53 of the filter 13 is, for example, 8 or less, and preferably 6 or less.

[0033] As an example, Fig. 6 shows a filter 13 having four protrusions 53 with a circumferential length such that the central angle α is 38 degrees. Fig. 8 shows a filter 13 having two protrusions 53 with a circumferential length such that the central angle α is 80 degrees. Fig. 9 shows a filter 13 having eight protrusions 53 with a circumferential length such that the central angle α is 18 degrees.

[0034] The total circumferential length of the multiple protrusions 53 is, for example, a length such that the sum of the central angles α is equal to or greater than 60 degrees and less than 180 degrees. Furthermore, the total circumferential length of the multiple protrusions 53 is preferably a length such that the sum of the central angles α is equal to or greater than 140 degrees, more preferably equal to or greater than 150 degrees, and even more preferably equal to or greater than 160 degrees.

[0035] The circumferential length of the circumferential grooves A1 of the groove portion A is set so that the total angle range β shown in FIG. 7 falls within a specific range. FIG. 7 is a front view of the pipe mouth faucet 10 in an installed state, with the cover member 12 omitted. The tubular member 11 is indicated by a solid line, and the filter 13 is indicated by a dashed line. The angle range β is the range in which the first side wall 25a and the second side wall 31 (not shown) overlap with the protrusion in the axial direction. In other words, the angle range β is the central angle formed between the center P of the filter body 50 and both ends of the circumferential range in which the first side wall 25a and the second side wall 31 overlap with the protrusion 53 in the axial direction. The total angle range β is, for example, greater than or equal to 60 degrees and less than 180 degrees. The total angle range β is preferably greater than or equal to 140 degrees, more preferably greater than or equal to 150 degrees, and even more preferably greater than or equal to 160 degrees.

[0036] Furthermore, the circumferential length of the range in which the first side wall 25a and the second side wall 31 face each other in the circumferential groove A1 is longer than the circumferential length of the protruding portion 53. The circumferential length of the insertion groove A2 of the groove portion A may be a length into which the protrusion 53 of the filter 13 can be inserted, i.e., it may be longer than the circumferential length of the protrusion 53. However, from the viewpoint of increasing the total angle range β, it is preferable that the circumferential length be slightly longer than the circumferential length of the protrusion 53.

[0037] Next, the operation of this embodiment will be described. The pipe mouth faucet 10 of this embodiment is attached by inserting the end of the second opening 20b of the tubular member 11 into the inlet or outlet end of a water pipe (not shown). By rotating the cover member 12 of the pipe mouth faucet 10 attached to the water pipe, it is possible to switch between a water-stopping state in which the cover member 12 closes the first opening 20a and a flow-through state in which the first opening 20a is partially or completely open. In addition, by adjusting the amount of rotation of the cover member 12 to change the opening amount of the first opening 20a, the amount of water passing through the pipe mouth faucet 10 can be adjusted.

[0038] The pipe mouth faucet 10 is equipped with a filter 13 attached to the first opening 20a of the tubular member 11. Solid matter attempting to pass through the pipe mouth faucet 10 is captured by the filter 13, thereby preventing solid matter from flowing downstream of the pipe mouth faucet 10. Examples of solid matter captured by the filter 13 include coating films of coated agricultural fertilizers, driftwood, and fallen leaves. The filter 13 can be attached and detached to the tubular member 11 by the simple operation of inserting it into the first opening 20a of the tubular member 11 and rotating it. This allows for easy maintenance, such as cleaning and replacement of the filter 13.

[0039] Furthermore, when the filter 13 is installed, the water pressure of the water flowing through the pipe mouth faucet 10 is applied, and this water pressure can sometimes rise excessively. For example, if large surface-shaped solid objects such as fallen leaves are collected on the filter body 50 of the filter 13, the solid objects will act as a resistance to the water flow, and high water pressure will be applied to the filter 13 through the solid objects. If excessively high water pressure is applied to the filter 13, there is a risk that the filter 13 will come off the tubular member 11 or be damaged.

[0040] Here, the filter 13 of this embodiment is fixed to the tubular member 11 by positioning a protruding portion 53 protruding from the outer periphery of the filter body 50 within a groove portion A provided on the inner circumferential surface of the first opening 20a of the tubular member 11. At this time, the protruding portion 53 of the filter 13 is sandwiched in the axial direction between the first side wall 25a and the second side wall 31 that form the circumferential groove A1. The abutment of the protruding portion 53 of the filter 13 with the first side wall 25a or the second side wall 31 of the circumferential groove A1 allows the filter 13 to withstand high water pressure applied to it. Therefore, the filter 13 can be stably held in the first opening 20a of the tubular member 11.

[0041] In particular, the effect of improving water pressure resistance obtained by the above-mentioned abutment can be obtained regardless of the direction of water pressure applied to the filter 13 along the axial direction of the tubular member 11. Therefore, the pipe mouth tap 10 of this embodiment can be used as both a pipe mouth tap attached to the inlet side of a water pipe and a pipe mouth tap attached to the outlet side of a water pipe.

[0042] Next, the effects of this embodiment will be described. (1) The pipe mouth faucet 10 comprises a tubular member 11 having a first opening 20a at its end, and a cover member 12 that switches between a water-stop state in which the first opening 20a is closed and a flow-through state in which the first opening 20a is open. The pipe mouth faucet 10 comprises a filter 13 that is detachably attached to the first opening 20a by inserting it into the first opening 20a and rotating it. The filter 13 comprises a disk-shaped filter body 50 and multiple protrusions 53 that protrude from the outer periphery of the filter body 50. The inner circumferential surface of the first opening 20a is provided with a groove A into which the protrusions 53 are inserted. The groove A comprises a circumferential groove A1 that extends circumferentially and has a first side wall 25a and a second side wall 31 that face each other in the axial direction of the tubular member 11, and an insertion groove A2 that connects the end of the first opening 20a to the circumferential groove A1.

[0043] The above configuration can prevent solid matter from flowing downstream of the pipe mouth tap 10. Furthermore, whether the configuration is applied to a pipe mouth tap attached to the inlet end of a water pipe or a pipe mouth tap attached to the outlet end of a water pipe, the filter 13 can be stably held in the first opening 20a of the tubular member 11.

[0044] (2) Three or more protrusions 53 are provided at rotationally symmetric positions on the outer periphery of the filter body 50 . According to the above configuration, the load applied to the filter 13 by water pressure is evenly distributed to the plurality of protrusions 53. Therefore, the filter 13 can be held in the first opening 20a of the tubular member 11 more stably.

[0045] (3) In the circumferential direction of the outer periphery of the filter body 50, the total angle range β over which the first side wall 25a and the second side wall 31 of the circumferential groove A1 overlap with the protrusion 53 in the axial direction is equal to or greater than 60 degrees and less than 180 degrees.

[0046] According to the above configuration, the range in which the protrusion 53 is supported by the first side wall 25a and the second side wall 31 of the circumferential groove A1 is increased. This increases the effect of improving water pressure resistance due to contact between the protrusion 53 and the first side wall 25a or the second side wall 31. Therefore, the filter 13 can be more stably held in the first opening 20a of the tubular member 11.

[0047] (4) The tubular member 11 includes a tubular first member 20 having a groove wall portion 25 formed on its inner circumferential surface, which forms the insertion groove A2 and the first side wall 25a, and a second member 30 fixed to the inner circumferential surface of the first member 20 and which forms the second side wall 31. The groove wall portion 25 of the first member 20 and the second member 30 form a groove portion A.

[0048] According to the above configuration, the groove portion A can be easily provided on the inner circumferential surface of the first opening portion 20a of the tubular member 11. (5) The circumferential length of the protrusion 53 is such that the central angle α is equal to or greater than 30 degrees and less than 90 degrees. In other words, the protrusion 53 is provided so that the angular range in the circumferential direction of the outer periphery of the filter body 50 is equal to or greater than 30 degrees and less than 90 degrees.

[0049] According to the above configuration, the protruding portion 53 is made long in the circumferential direction, thereby improving the strength of the protruding portion 53 itself. This further enhances the effect of improving water pressure resistance due to the abutment between the protruding portion 53 and the first side wall 25a or the second side wall 31. Therefore, the filter 13 can be more stably held in the first opening 20a of the tubular member 11.

[0050] (6) The tubular member 11 includes a support wall 32 that protrudes from the inner peripheral surface and supports the outer periphery of the end face of the filter body 50 in the axial direction. The above configuration also improves water pressure resistance due to the contact between the filter body 50 and the support wall 32. This provides higher water pressure resistance against the water pressure of the water flowing from the first opening 20a to the second opening 20b. This allows the filter 13 to be more stably held in the first opening 20a of the tubular member 11 when used as a pipe inlet faucet attached to the inlet end of a water pipe.

[0051] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. The materials forming the components of the pipe outlet faucet 10 are not particularly limited. Examples of such materials include synthetic resin materials and metal materials. Specific examples include a pipe outlet faucet 10 comprising a first member 20, a second member 30, and a cover member 12 made of polyvinyl chloride, and a filter 13 made of polyethylene. When the first member 20 and the second member 30 are bonded together with an adhesive, it is preferable that the materials forming the first member 20 and the second member 30 and the material forming the filter 13 are different materials. In this case, the adhesive used to bond the first member 20 and the second member 30 can prevent the filter 13 from being bonded to the filter 13.

[0052] The multiple protrusions 53 provided on the filter 13 may be different in dimensions other than the circumferential length. In other words, the multiple protrusions 53 provided on the filter 13 may be a combination of protrusions 53 having shapes that differ in dimensions other than the circumferential length. In this case, the shape of the groove A of the tubular member 11 is changed to match the shape of each protrusion 53.

[0053] The arrangement of the plurality of protrusions 53 on the outer periphery of the filter body 50 may not be rotationally symmetric. The groove portion A may be configured so that the axial wall 25b is omitted. In this case, it is easy to increase the total angle range β over which the first side wall 25a and the second side wall 31 of the circumferential groove A1 overlap with the protrusion 53 in the axial direction.

[0054] In the above embodiment, when the filter 13 is rotated during installation, the rotation of the filter 13 is stopped when the protrusion 53 abuts against the axial wall 25b. The configuration for stopping the rotation of the filter 13 is not limited to the above configuration. For example, a configuration may be adopted in which uneven portions are provided on the opposing surfaces of the protrusion 53 and the first side wall 25a or the second side wall 31, and the rotation of the filter 13 is stopped and the position in the rotational direction is fixed when the uneven portions engage with each other.

[0055] The tubular member 11 may have a shape in which the support wall 32 is omitted. The tubular member 11 may be formed by combining three or more members, or may be formed by a single member.

[0056] The position where the first side wall 25a is formed in the axial direction may be changed. For example, in the example shown in Fig. 5, the first side wall 25a is provided so that a connection portion B between the end face of the tubular portion of the first member 20 on the first opening 20a side and the side face of the first side wall 25a forms a continuous surface without any steps. In this case, it is possible to prevent solid matter and other debris from the water flow from accumulating at the connection portion B. Furthermore, the first side wall 25a may be provided at a position where the side face of the first side wall 25a is recessed in the axial direction or protrudes in the axial direction with respect to the end face of the tubular portion of the first member 20 on the first opening 20a side.

[0057] The filter 13 may have a shape that is symmetrical between the front and back, when the surfaces on both sides in the axial direction are the front and back, respectively, or may have a shape that is asymmetrical between the front and back. If the filter 13 has a shape that is symmetrical between the front and back, the filter 13 can be attached to the tubular member 11 with either the front or back surface facing the tubular member 11. Therefore, there is no need to check the front and back of the filter 13 when attaching it to the tubular member 11.

[0058] The shape of the protrusion 53 is not particularly limited, but is preferably a shape that facilitates the attachment of the filter 13 to the tubular member 11. For example, the protrusion 53 shown in Fig. 10 has tapered surfaces 53a at both circumferential ends of the protrusion 53, the width (axial length) of which gradually decreases from the center toward the ends. In this case, when the filter 13 is attached, the protrusion 53 is less likely to get caught on the groove A when it is inserted into the insertion groove A2 of the groove A of the tubular member 11 and when it moves within the circumferential groove A1 of the groove A. This facilitates the attachment of the filter 13 to the tubular member 11.

[0059] The filter 13 may be provided with a filter operating part for facilitating attachment and detachment to and from the tubular member 11. The filter operating part is configured to be able to be gripped or to have a finger hooked, such as a through-hole, a recess, or a protrusion. The filter operating part is provided, for example, on the surface of the filter body 50 that faces outward when attached.

[0060] Furthermore, the position of the filter operation part is preferably within a sector of a central angle α, with vertices at both circumferential ends of the protrusion 53 and the center P of the filter body 50, as shown in Fig. 6. The part of the filter body 50 where the filter operation part is provided is more likely to experience locally high water pressure, either directly or via solid matter in the water flow, compared to the part where the filter operation part is not provided. By providing the filter operation part within the above range, even if high water pressure is locally applied to the part where the filter operation part is provided, the abutment between the protrusion 53 and the circumferential groove A1 allows the part to withstand high water pressure.

[0061] The configuration of the lid member 12 is not limited to the above embodiment as long as it can open and close the opening of the tubular member 11. For example, as shown in Fig. 11, the lid member 12 may be a sliding type.

[0062] The pipe mouth faucet 10A shown in Figure 11 comprises a tubular member 11, a cover member 12 that opens and closes the opening of the tubular member 11, and a filter 13 that is detachably attached to the opening of the tubular member 11. A groove wall portion 25 that protrudes radially outward and inward is formed on the inner circumferential surface of the first opening 20a of the tubular member 11. The groove wall portion 25 is provided at a position where the side surface of the first side wall 25a is recessed in the axial direction relative to the end face of the tubular portion of the tubular member 11 on the first opening 20a side.

[0063] A flange 22 having a rectangular shape in plan view is provided at the end of the tubular member 11 on the side where the first opening 20a is located. A pair of guide walls 26 that support both side ends of the cover member 12 are provided on both sides of the flange 22. The guide walls 26 have guide grooves 26a into which both side ends of the cover member 12 are inserted and which guide the cover member 12 as it moves up and down.

[0064] The lid member 12 comprises a rectangular lid body 60 and a grip portion 61 provided on the top of the lid body 60. The lid member 12 is attached so that it can be raised and lowered freely relative to the tubular member 11 by inserting both side ends of the lid body 60 into the guide grooves 26a of the guide wall 26. By raising and lowering the lid member 12 relative to the tubular member 11, the pipe mouth faucet 10A can be switched between a water-stopping state in which the lid member 12 closes the first opening 20a, and a flow-through state in which the first opening 20a is partially or completely open.

[0065] Guide wall 26 is provided with a holding portion 27 for holding lid member 12 at any vertical position. Holding portion 27 is a bolt that is threaded into a screw hole provided in guide wall 26. Holding portion 27 holds lid member 12 at any vertical position by pressing its tip, which is located within guide groove 26a, against lid main body 60 of lid member 12.

[0066] The lid main body 60 is provided with a movement restricting portion 62 that restricts the lifting and lowering movement of the lid member 12 beyond a preset range. The movement restricting portion 62 is a bolt that is screwed into a threaded hole provided in the lid main body 60 and has a tip that is located inside the first opening 20a of the tubular member 11. The tip of the movement restricting portion 62 abuts against the upper part of the inner circumferential surface of the first opening 20a, thereby restricting the lifting of the lid member 12 beyond the abutting position.

[0067] Next, the technical ideas that can be understood from the above-described embodiment and modified examples will be described below. (i) The pipe mouth faucet, wherein the protrusion is provided so that the angle range in the circumferential direction of the outer periphery of the filter body is 30 degrees or more and less than 90 degrees.

[0068] (b) The pipe mouth faucet, wherein the tubular member has a support wall that protrudes from the inner peripheral surface and supports the outer periphery of the end face of the filter body in the axial direction. [Explanation of symbols]

[0069] α…Central angle β...Angle range A...Groove A1…Circumferential groove A2…insertion groove 10...Pipe faucet 11...Tubular member 12...Cover member 13...Filter 20...First member 20a…1st opening 20b…Second opening 25...Groove wall 25a...First side wall 25b…Axial wall 30...Second member 31...Second side wall 32…Supporting wall 50...Filter body 51...Frame 52...Filter section 53...Protrusion

Claims

1. A pipe outlet faucet comprising a tubular member having an opening at an end, and a cover member that switches between a water-stop state in which the opening is closed and a flow-through state in which the opening is open, a filter that is detachably attached to the opening by being inserted into the opening and rotated; The filter includes a disk-shaped filter body and a plurality of protrusions protruding from an outer periphery of the filter body, a groove into which the protrusion is inserted is provided on an inner circumferential surface of the opening, The groove portion is A pipe mouth faucet characterized by having a circumferential groove extending circumferentially and having a first side wall and a second side wall opposing each other in the axial direction of the tubular member, and an insertion groove connecting the end of the opening and the circumferential groove.

2. The pipe mouth faucet according to claim 1, wherein three or more of the protrusions are provided at rotationally symmetric positions on the outer periphery of the filter body.

3. 3. A pipe outlet faucet as described in claim 1 or claim 2, wherein the total angular range in which the first side wall and the second side wall of the circumferential groove overlap with the protrusion in the axial direction in the circumferential direction of the outer periphery of the filter body is greater than or equal to 60 degrees and less than 180 degrees.

4. the tubular member includes a tubular first member having a groove wall portion on an inner circumferential surface thereof that forms the insertion groove and the first side wall, and a second member that is fixed to the inner circumferential surface of the first member and that forms the second side wall, A pipe mouth faucet according to any one of claims 1 to 3, wherein the groove portion is formed by the groove wall portion of the first member and the second member.

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