JP2019030271A - Pipe junction structure and sprinkling apparatus - Google Patents

Abstract

To provide a pipe junction structure capable of securing internal airtightness while preventing deformation and damage of its junction part.SOLUTION: A pipe junction structure X comprises: a cylindrical and resin supply pipe part, provided on a liquid chemical tank for storing liquid, for circulating the liquid; a hose boot 20 attached to the supply pipe part, the hose boot including a cylindrical wall part 21 into which the supply pipe part is to be inserted; and a toric and resin clamp 30 to be attached to the outer peripheral surface 21a of the cylindrical wall part 21 in a state in which the supply pipe part 2c is inserted into the cylindrical wall part 21 of the hose boot 20. A toric inner rib 38 protruding inward in the radial direction is provided on the inner peripheral surface 31a of the clamp 30.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pipe joint structure and a spraying device in a resin pipe provided in a container such as a chemical tank.

  Conventionally, as described in Patent Document 1, a back-loading type sprayer in which a pump is attached to a chemical solution tank is known. In this sprayer, in order to send the chemical solution in the chemical solution tank to the pump, a water supply hose is hung toward the bottom of the chemical solution tank. In order to attach the water supply hose to the chemical tank, a hose boot (lid member) is attached to a cylindrical supply pipe provided in the chemical tank. The hose boot is fastened to the supply pipe with an annular clamp (band) so that the chemical liquid does not leak from the gap between the supply pipe of the chemical liquid tank and the hose boot.

JP 2014-117221 A

  In the above apparatus, the chemical tank is often made of a hard resin material. On the other hand, the hose boot is often made of a soft resin material. When a hose boot made of a soft material is attached to a supply pipe made of a hard material, it is common to tighten the joint portion with a metal or resin clamp. Tightening with a clamp increases the airtightness of the joint. Further, it is possible to prevent the fluid from leaking from the joint or the hose coming off due to the pressure of the internal fluid or the tensile force applied to the hose.

  However, a metal clamp, for example, is not only expensive but also heavy, and is not suitable for a device such as a back sprayer. On the other hand, although the resin clamp (band) is lightweight, its strength is low, and if it is tightened strongly, it may cause deformation or breakage. If a clamp that is tightened with a screw is used, the tightening force can be increased to increase the tightening pressure. When the pressure increases, the airtightness increases. However, for example, the supply pipe of the chemical solution tank cannot withstand the tightening load and may be deformed.

  An object of the present invention is to provide a pipe joint structure and a spraying device that can ensure internal airtightness while preventing deformation and breakage of a joint portion.

  A pipe joint structure (X) according to one embodiment of the present invention is provided in a container (2) for storing a liquid, and has a cylindrical and resin pipe part (2c) for circulating the liquid, and a pipe part (2c). ) And a tubular member (20) including a cylindrical wall part (21) into which the pipe part (2c) is inserted, the soft resin formed from a material softer than the material forming the pipe part (2c) A tubular member (20) made of a tubular member (20), and the tubular member (20) is attached to the outer peripheral surface (21a) of the cylindrical wall portion (21) in a state where the tube portion (2c) is inserted into the cylindrical wall portion (21); An annular and resin clamp (30) that clamps and fixes the cylindrical wall portion (21) to the tube portion (2c), and the inner peripheral surface (31a) of the clamp (30) has a radial direction. An annular rib (38) protruding inward is provided.

  According to this pipe joint structure (X), the pipe part (2c) of the container (2) is inserted into the cylindrical wall part (21) of the tubular member (20), and the outer peripheral surface of the cylindrical wall part (21) ( The cylindrical wall part (21) is fixed to the pipe part (2c) by the clamp (30) attached to 21a). The rib (38) of the clamp (30) is in contact with the outer peripheral surface (21a) of the tubular member (20) made of a soft resin that is softer than the tube portion (2c). By providing the rib (38), the surface pressure (load per area) at the portion of the rib (38) is increased. Thereby, a cylindrical wall part (21) is firmly clamped with respect to a pipe part (2c), and the airtightness in a container (2) can be ensured. Further, the tubular member (20) may be tightened at the rib (38), and it is not necessary to tighten the entire clamp (30). Therefore, deformation and breakage of the clamp (30) are prevented. Since the load (tightening load) with respect to the entire inner peripheral surface (31a) of the clamp (30) is low, deformation of the pipe portion (2c) of the container (2) is also prevented. Further, the rib (38) bites into the outer peripheral surface (21a) and is caught, thereby preventing the clamp (30) from being displaced in the axial direction of the pipe portion (2c).

  The clamp (30) has an annular and resin-made clamp body (31) having an opening (39) in at least one place in the circumferential direction, and is provided on the opening (39) side of the clamp body (31). A pair of projecting pieces (32, 33) each formed with a hole (32a, 33a) projecting outward in the direction and penetrating in the tangential direction of the clamp body (31), and a pair of projecting pieces (32, 33) A bolt (34) inserted through the hole (32a, 33a) and a nut (36) screwed into the bolt (34), and an open portion ( 39) is reduced and the clamp body (31) clamps the cylindrical wall (21) of the tubular member (20). In this case, the clamp body (31) can be securely and easily tightened using the bolt (34) and the nut (36). The tightening load can be easily adjusted.

  An annular second rib (37) protruding radially outward is provided on the outer peripheral surface (31d) of the clamp (30), and the center axis (L) of the pipe portion (2c) is provided. The position of the second rib (37) in the direction corresponds to the position of the rib (38) in the direction of the central axis (L). In this case, the annular portion (clamp body (31)) of the clamp (30) and the rib (38) on the inner peripheral surface (31a) side are reinforced by the second rib (37).

  Moreover, as another aspect of the present invention, a pump (10) that pumps the liquid in the container (2) to be sprayed is fixed to the pipe part (2c) via any of the pipe joint structures (X) described above. A spraying device (1) may be provided. In the spraying device (1), the tubular member (20) includes a bottom wall portion (23) provided at an end of the cylindrical wall portion (21) opposite to the container (2), and the tubular member (20). The water supply port (24) into which the hose (H) for inhaling the liquid in the container (2) is inserted is formed in the bottom wall portion (23) of the water supply port (23). The inlet pipe (11) of the pump (10) is inserted into H) and fixed to the water supply port (24), whereby the hose (H) is fixed to the tubular member (20) and the tubular member (20). The pump (10) is fixed to the container (2) via In this case, the tubular member (20) can be used to fix the hose (H), and furthermore, the pump (10) can be fixed. With the pipe joint structure (X), while preventing deformation and breakage of the pipe part (2c) and the tubular member (20), air tightness in the container (2) is ensured, and liquid pumping by the pump (10) is performed. Scattering is preferably performed.

  According to the present invention, airtightness in the container (2) can be ensured, and deformation and breakage of the clamp (30) and the pipe part (2c) are prevented.

It is a perspective view showing the state where the bracket was removed in the spraying device to which the tube junction structure concerning one embodiment of the present invention was applied. It is a disassembled perspective view which shows the container and pump unit in FIG. It is a disassembled perspective view which shows the pump unit in FIG. It is a disassembled perspective view which shows the joining structure in FIG. It is a perspective view which shows the clamp in FIG. It is sectional drawing which cut | disconnects and shows the joining structure of FIG. 4 in the surface which passes along the axis line of a water supply port.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the terms “upper” and “lower” and “front” and “backward” are directions with reference to the case of the operator carrying the backpack type power sprayer 1, and the left and right words are the operations carried on the backpack type power sprayer 1. The direction is based on the case where the person is viewed from the front.

  As shown in FIG. 1 and FIG. 2, a backpack type power sprayer 1 that is a spraying device is configured to remove a chemical solution (liquid) stored in a chemical solution tank (container) 2 while an operator carries the chemical solution tank 2 and the like. For spraying (spreading). The chemical liquid tank 2 has a concave portion 2a at its lower portion, and a flat pump mounting surface 2b to which the pump 10 is mounted is formed in the concave portion 2a. 1 and 2 show a state in which the bracket that covers the recess 2a of the chemical tank 2 is removed.

  The chemical tank 2 is made of a hard resin material such as polyethylene. As shown in FIG. 2, the pump mounting surface 2b is a vertical surface substantially orthogonal to the front-rear direction, and a cylindrical supply pipe portion 2c protruding rearward is formed on the pump mounting surface 2b. The supply pipe portion 2 c provided at the lower part of the chemical liquid tank 2 forms a liquid supply port for communicating the inside and outside of the chemical liquid tank 2. A pump 10 is attached to the supply pipe portion 2c. The supply pipe part 2c is a pipe part for supplying (circulating) the chemical liquid stored in the chemical liquid tank 2. The supply pipe portion 2c formed integrally with the chemical liquid tank 2 is made of a hard resin material such as polyethylene.

  As shown in FIGS. 2 and 3, the pump 10 constitutes a pump unit U together with a hose boot (tubular member) 20 and a hose H attached to the supply pipe portion 2 c. The pump 10 includes a pump main body 3, a motor 5, and a pressure regulating valve 4. The pump 10 pumps the chemical solution in the chemical solution tank 2 to spray it from a nozzle (not shown). The pump 10 includes an inlet pipe 11 that sucks the chemical liquid from the chemical liquid tank 2, an outlet pipe (not shown) that sends out the chemical liquid, a sewage pipe 12 provided in the pressure regulating valve 4, and a pressure regulating valve outlet pipe 4 a. The pressure regulating valve 4 introduces the chemical liquid fed from the pump body 3 and controls the pressure of the chemical liquid fed from the pressure regulating valve outlet pipe 4a to the nozzle and sprayed. The pressure regulating valve 4 returns the excess chemical liquid to the chemical liquid tank 2 through the residual water pipe 12 inserted into the through hole 26 a (see FIG. 4) of the residual water port 26 of the hose boot 20. The spillage port 26 and the spillage pipe 12 are fixed to each other by tightening a band 28 extrapolated to the outer peripheral surface of the spillage port 26.

  The inlet pipe 11 protruding forward from the casing 6 of the pump 10 is inserted into a through hole 24 a (see FIG. 4) of the water supply port 24 of the hose boot 20 and sucks the chemical solution in the chemical solution tank 2 through the hose H. The water supply port 24 and the inlet pipe 11 are fixed to each other in a state where the base end Ha of the hose H is interposed (see FIG. 6) by tightening a band 27 that is extrapolated to the outer peripheral surface of the water supply port 24. . The tip Hb of the hose H hangs down toward the bottom of the chemical tank 2.

  With reference to FIG. 3 and FIG. 6, the fixing structure of the pump 10 will be described in more detail. The pump 10 is fixed to the supply pipe portion 2c via the pipe joint structure X of the present embodiment. The hose boot 20 is joined to the supply pipe portion 2 c by the pipe joining structure X, and the pump 10 is fixed via the hose boot 20.

  The hose boot 20 is made of a material softer than the material forming the chemical liquid tank 2, that is, the supply pipe portion 2c. The hose boot 20 is a soft resin member formed of, for example, soft vinyl chloride. The hose boot 20 may be formed from a thermoplastic elastomer or the like. The hose boot 20 includes a cylindrical wall portion 21 into which the supply pipe portion 2c is inserted, and a bottom wall portion 23 provided at an end portion of the cylindrical wall portion 21 opposite to the chemical liquid tank 2 and closing the end portion. Including. The bottom wall 23 is formed with one water supply port 24 and one spillage port 26 described above (see also FIG. 4). The water supply port 24 and the excess water port 26 are both formed so as to protrude rearward. The base end Ha of the hose H is inserted into the through hole 24a of the water supply port 24 from the front. The inlet pipe 11 of the pump 10 is inserted into the base end Ha of the hose H from behind, and these are fastened together by a band 27. Thereby, the hose H is fixed to the hose boot 20, and at the same time, the pump 10 is fixed to the chemical liquid tank 2.

  In the present embodiment, “soft”, “soft” or “hard” can be defined by various indices representing “hardness” used by those skilled in the art. For example, examples of the hardness index include Rockwell hardness (HRC), Vickers hardness (Hv), Shore hardness, and the like.

  Then, with reference to FIGS. 3-5, the pipe joint structure X of this embodiment is demonstrated in detail. The pipe joint structure X includes a supply pipe portion 2c of the chemical liquid tank 2, a hose boot 20 that is a tubular member attached to the supply pipe portion 2c, and a clamp 30 that fastens and fixes the hose boot 20 to the supply pipe portion 2c. With. The supply pipe portion 2c, the hose boot 20, and the clamp 30 are provided concentrically around the central axis L of the supply pipe portion 2c. The clamp 30 is characterized in that the rigid supply pipe portion 2c and the soft hose boot 20 are suitably fixed (that is, the tightening load is not excessive) and the air tightness in the chemical tank 2 is secured. It has a certain structure. Hereinafter, the clamp 30 will be mainly described.

  The clamp 30 is made of resin and is formed of a material harder than the material forming the hose boot 20. The clamp body 31 of the clamp 30 is made of a hard resin material, and is made of, for example, PA (polyamide) or POM (polyacetal). The clamp 30 is provided at an annular clamp body 31 having an open portion 39 at one place in the circumferential direction and two adjacent ends on the open portion 39 side of the clamp body 31 and protrudes radially outward. A pair of protruding pieces 32 and 33 are provided. The clamp body 31 and the pair of protruding pieces 32 and 33 are integrally formed, for example. The pair of projecting pieces 32 and 33 are formed with a pair of holes 32 a and 33 a penetrating in the tangential direction of the clamp body 31.

  The clamp 30 further includes a hole 32 a of the pair of projecting pieces 32 and 33, a bolt 34 through which the shaft portion 34 a is inserted into the hole 33 a, and a nut 36 that is screwed into the bolt 34. The protruding piece 32 may be formed with a recess 32b (see FIG. 4) in which the head 34b of the bolt 34 is accommodated.

  As shown in FIG. 5, the outer peripheral surface 31 d of the clamp body 31 is provided with an annular outer rib (second rib) 37 protruding outward in the radial direction. An annular inner rib 38 that protrudes radially inward is provided on the inner peripheral surface 31 a of the clamp body 31. The outer rib 37 and the inner rib 38 are provided at substantially the center of the length (width) of the clamp body 31 in the direction of the central axis L. That is, in the direction of the central axis L, the position of the outer rib 37 and the position of the inner rib 38 coincide with each other. Thus, the position of the outer rib 37 in the direction of the central axis L corresponds to the position of the inner rib 38 in the direction of the central axis L. According to this configuration, the clamp main body 31 and the inner rib 38 are reinforced by the outer rib 37.

  The height of the inner rib 38 (height protruding inward) can be set as appropriate according to the tightening pressure required to tighten the hose boot 20. The height of the inner rib 38 may be constant over the entire circumference of the clamp body 31. The peripheral surface portion 31b other than the inner rib 38 on the inner peripheral surface 31a forms a cylindrical surface having a certain radius.

  As shown in FIGS. 4 and 6, in the pipe joint structure X, the clamp 30 is attached to the outer peripheral surface 21 a of the cylindrical wall portion 21 in a state where the supply pipe portion 2 c is inserted into the cylindrical wall portion 21 of the hose boot 20. The open portion 39 is reduced by screwing the bolt 34 and the nut 36, and the clamp body 31 clamps the cylindrical wall portion 21. Thereby, the clamp 30 clamp | tightens and fixes the cylindrical wall part 21 of the hose boot 20 with respect to the supply pipe part 2c. The inner rib 38 provided on the inner peripheral surface 31a of the clamp 30 that faces the outer peripheral surface 21a of the cylindrical wall portion 21 is in pressure contact with the outer peripheral surface 21a over the entire circumference (excluding the open portion 39). The inner peripheral surface 21b of the cylindrical wall portion 21 is in pressure contact with the outer peripheral surface 7 of the supply pipe portion 2c.

  More specifically, the inner rib 38 bites into the outer peripheral surface 21a of the hose boot 20 made of a soft material. In the portion where the inner rib 38 is provided, a tightening load is applied with a locally high pressure. A part of the peripheral surface portion 31b other than the inner rib 38 on the inner peripheral surface 31a of the clamp 30 does not contact the outer peripheral surface 21a of the hose boot 20 and floats from the outer peripheral surface 21a. 20 is in surface contact with the outer peripheral surface 21a. In a portion where the inner rib 38 is not provided, that is, the peripheral surface portion 31b, a tightening load is applied with a relatively low pressure. In addition, in FIG. 6, illustration of the part which floated from the outer peripheral surface 21a is abbreviate | omitted.

  The flange portion 22 of the hose boot 20 is brought into contact with and in surface contact with the pump mounting surface 2b of the chemical liquid tank 2, and the end surface 31c of the clamp body 31 on the chemical liquid tank 2 side is in contact with the flange portion 22.

  According to the pipe joint structure X of the present embodiment, the supply pipe part 2 c of the chemical liquid tank 2 is inserted into the cylindrical wall part 21 of the hose boot 20, and is clamped by the clamp 30 attached to the outer peripheral surface 21 a of the cylindrical wall part 21. The cylindrical wall portion 21 is fixed to the supply pipe portion 2c. The inner rib 38 of the clamp 30 contacts the outer peripheral surface 21a of the soft resin hose boot 20 that is softer than the supply pipe portion 2c. By providing the inner rib 38, the surface pressure (load per area) in the portion of the inner rib 38 is increased. Thereby, the cylindrical wall part 21 is firmly tightened with respect to the supply pipe part 2c, and the airtightness in the chemical | medical solution tank 2 is ensured. Further, the hose boot 20 may be tightened at the inner rib 38, and the entire clamp 30 need not be tightened strongly. Therefore, deformation and breakage of the clamp 30 are prevented. Since the load (tightening load) with respect to the entire inner peripheral surface 31a of the clamp 30 is low, deformation of the supply pipe portion 2c of the chemical liquid tank 2 is also prevented. Further, the inner rib 38 bites into the outer peripheral surface 21a and is caught, so that the clamp 30 is prevented from being displaced in the axial direction of the supply pipe portion 2c. In addition, the resin clamp 30 reduces the weight.

  According to the clamp 30, the clamp body 31 can be securely and easily tightened using the bolt 34 and the nut 36. The tightening load can be easily adjusted.

  The clamp main body 31 and the inner rib 38 are reinforced by the outer rib 37 formed at a position corresponding to the inner rib 38. Even if local clamping is performed at the portion of the inner rib 38 by the clamp 30, the clamp 30 reinforced by the outer rib 37 can sufficiently withstand the tightening load.

  Since a part of the peripheral surface portion 31b of the clamp body 31 is in surface contact with the outer peripheral surface 21a of the hose boot 20, the clamping and holding of the hose boot 20 and the supply pipe portion 2c by the clamp 30 is stabilized. On the other hand, a part of the peripheral surface portion 31 b is separated from the outer peripheral surface 21 a of the hose boot 20. Thereby, it is prevented that the load (tightening load) with respect to the whole inner peripheral surface 31a of the clamp 30 becomes excessive.

  According to the backpack type power sprayer 1 to which the pipe joint structure X is applied, the hose H can be fixed using the hose boot 20, and further, the pump 10 can be fixed. By the pipe joint structure X, the pumping pipe 10 is suitably pumped and sprayed while ensuring the airtightness in the chemical tank 2 while preventing the supply pipe 2c and the hose boot 20 from being deformed or damaged.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, in the said embodiment, although the spreading | diffusion apparatus is the back type power sprayer 1 which sprays a chemical | medical solution, the apparatus which spreads other liquids may be sufficient. When a tubular member is joined to a pipe part of a container other than the chemical liquid tank 2, the pipe joint structure of the present invention may be applied. The specific aspect of the clamp may be changed as appropriate. The present invention is not limited to the case where one clamp body 31 is provided, and a clamp body divided into two pieces may be coupled by a fastening member. The cross-sectional shape of the inner rib may be a rectangle, but may be a shape with a rounded tip.

  The tubular member made of a soft resin attached to the pipe portion is not limited to the lid member such as the hose boot 20 of the above embodiment. The tubular member may be any member as long as the tubular member includes a cylindrical wall portion into which the tube portion is inserted. The tubular member may be a pipe connected to the container.

  DESCRIPTION OF SYMBOLS 1 ... Back type power sprayer (dispersing device), 2 ... Chemical tank (container), 2c ... Supply pipe part (pipe part), 10 ... Pump, 11 ... Inlet pipe, 20 ... Hose boot (tubular member), 21 ... Cylindrical wall portion, 21a ... outer peripheral surface, 23 ... bottom wall portion, 24 ... water supply port, 30 ... clamp, 31 ... clamp body, 31a ... inner peripheral surface, 31b ... peripheral surface portion (other than ribs), 32 ... projecting piece 32a ... hole, 33 ... projection piece, 33a ... hole, 34 ... bolt, 36 ... nut, 37 ... outer rib (second rib), 38 ... inner rib (rib), 39 ... opening portion, X ... Pipe joint structure.

Claims (4)

A cylindrical and resin-made tube portion (2c) provided in the container (2) for storing the liquid and for circulating the liquid;
A tubular member (20) that includes a cylindrical wall (21) that is attached to the tube (2c) and into which the tube (2c) is inserted, and is softer than the material that forms the tube (2c). A tubular member (20) made of a soft resin made of a material;
The tubular member (20) is attached to the outer peripheral surface (21a) of the cylindrical wall portion (21) in a state where the tubular portion (2c) is inserted into the cylindrical wall portion (21), and the cylindrical wall portion ( 21) an annular and resin clamp (30) for fastening and fixing the tube portion (2c) to the pipe portion (2c),
The pipe joint structure (X) is provided with an annular rib (38) protruding radially inward on the inner peripheral surface (31a) of the clamp (30). The clamp (30)
An annular and resin clamp body (31) having an open portion (39) in at least one place in the circumferential direction;
A pair of holes (32a, 33a) provided on the opening (39) side of the clamp body (31) and projecting radially outward and penetrating in the tangential direction of the clamp body (31). Projecting pieces (32, 33) of
A bolt (34) inserted through the hole (32a, 33a) of the pair of projecting pieces (32, 33), and a nut (36) screwed into the bolt (34);
The open portion (39) is reduced by screwing the bolt (34) and the nut (36), and the clamp body (31) tightens the cylindrical wall portion (21) of the tubular member (20). The pipe joint structure (X) according to claim 1. The outer peripheral surface (31d) of the clamp (30) is provided with an annular second rib (37) protruding outward in the radial direction,
The position of the second rib (37) in the direction of the central axis (L) of the pipe part (2c) corresponds to the position of the rib (38) in the direction of the central axis (L). Item 3. The pipe joint structure (X) according to item 1 or 2. A pump (10) that pumps the liquid in the container (2) through the pipe joint structure (X) according to any one of claims 1 to 3 to the pipe part (2c). A fixed spreading device (1),
The tubular member (20) includes a bottom wall (23) provided at an end of the cylindrical wall (21) opposite to the container (2),
A water supply port (24) into which a hose (H) for sucking the liquid in the container (2) is inserted is formed in the bottom wall portion (23) of the tubular member (20),
The inlet pipe (11) of the pump (10) is inserted into the hose (H) in the water supply port (24) and fixed to the water supply port (24), so that the hose (H) is tubular. The spraying device (1) fixed to the member (20) and the pump (10) to the container (2) via the tubular member (20).

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