JP2018043215A - Spray nozzle unit with variable jet direction - Google Patents

Abstract

[PROBLEMS] To improve the reliability and durability of a pipe joint that enables a spray head to bend at the same time so that the spray direction of the spray direction variable spray nozzle unit can be stably switched to at least three directions. Provide spray nozzle units. A pipe joint 10 combined with a spray head 2 includes a first member 11, a second member 12, and a posture holding mechanism 15. The posture holding mechanism 15 is inserted into a shaft hole 12c and a bearing hole 11c. A shaft body 13 that rotatably supports the cylindrical portion 11a, a plurality of engagement grooves 15a that are provided on the inner peripheral surface of the bearing hole 11c at intervals in the circumferential direction, and a free end that can be displaced in the radial direction. The spray direction variable spray nozzle unit 1 has a spring piece 13a and an engaging protrusion 13d, and the engaging protrusion 13d is fitted into the engaging groove 15a to maintain the bending posture of the first member. . [Selection] Figure 4

Description

  The present invention relates to a spray nozzle unit used for spraying a liquid such as a medicine, and more particularly to a spray direction variable spray nozzle unit that enables switching of a liquid spray direction.

  As a conventional example of the spray direction variable spray nozzle unit mentioned above, for example, there is one described in Patent Document 1 below.

  The liquid spray nozzle described in this document is capable of switching between straight jet and wide angle jet, and is provided between an operating rod having a liquid supply path and a spray head (nozzle head) provided at the tip of the operating rod. A pipe joint that allows the spray head to be bent with respect to the operating rod is provided.

  In the present invention, a portion of the liquid spray nozzle excluding the operation rod, that is, a portion in which the pipe joint and the spray head are combined is referred to as a spray nozzle unit.

  The spray nozzle unit includes a first member having a spherical portion movable at one end in the pipe joint, a second member having a concave spherical surface that closely contacts the spherical portion, and the first member. It is comprised with the connection tool which connects a spray head.

  Further, one of the flow path connection ports provided in correspondence with the first member and the second member has a shape extending long in the bending direction of the first member, and the spray head bent by the pipe joint is used as a bending end point. A return mechanism having a bent posture capable of releasing the holding is provided.

Japanese Patent No. 5596190

  The spray nozzle unit described in Patent Document 1 has two directions for switching the injection direction. That is, the spray head is fixed at two positions, ie, a straight position where the direction of the spray head is straight and a bending end position where the spray head is bent to the maximum, and liquid is ejected at each of the fixed positions.

  By the way, spraying of a medicine or the like by a liquid spraying device is preferable because the spraying efficiency and accuracy can be improved so that the spraying direction can be finely adjusted.

  Then, about the said spray nozzle unit, it examined considering making the direction of injection into three directions or more.

  However, the spray nozzle unit employed in the liquid spray nozzle of Patent Document 1 does not have a mechanism for holding the relative position of the first member and the second member at the intermediate point between the two fixed positions, and therefore, the spray head is placed in the middle. If an attempt is made to bend up to a point, there is a high possibility that the bending angle of the spray head will naturally fluctuate due to vibration or the like. This does not guarantee that the medicine or the like is ejected in the intended direction.

  The bending posture return mechanism provided in the liquid spray nozzle of Patent Document 1 has a relatively complicated structure, and further, both the connection of the lock cover to the first member and the connection of the ring-shaped member to the lock cover, This is done by engaging a small protrusion provided on the inner peripheral surface of the other member with a guide groove provided on the outer periphery of one member, improving the connection reliability and improving the durability of the engaging protrusion. But there was still room for improvement.

  Therefore, the present invention enables the spray direction variable spray nozzle unit to stably switch the liquid spray direction to at least three directions, and at the same time, the reliability and durability of the pipe joint that enables the spray head to be bent. The challenge is to improve.

  In order to solve the above-described problems, the present invention provides a spray direction variable spray nozzle unit having a combination of a spray head and a pipe joint having the following configuration.

  The pipe joint includes a first member, a second member, and a posture holding mechanism. The first member has a cylindrical portion having a channel connection port on one end side and a connecting portion for either the spray head or the operating rod on the other end side.

  In addition, the second member has a concave portion provided with a cylindrical surface for tightly contacting the cylindrical portion on one end side, and a connecting portion for either the spray head or the operating rod on the other end side.

  Either one of the flow path connection ports provided corresponding to the abutting surface of the cylindrical portion and the cylindrical surface extends long in the bending direction of the first member.

  The posture holding mechanism includes a bearing hole provided on both side surfaces of the cylindrical part, a shaft hole provided through both side walls of the second member, and the cylindrical part inserted into the shaft hole and the bearing hole. And a free end provided in a cantilevered state on the shaft body, and a plurality of engagement grooves arranged on the inner peripheral surface of the bearing hole at intervals in the circumferential direction. A spring piece displaceable in the radial direction and an engaging protrusion provided at a free end of the spring piece.

  The shaft body is a shaft that serves as a pivot point for the cylindrical portion, and the shaft body rotatably supports both side portions of the cylindrical portion.

  In the spray nozzle unit, the engaging protrusion is selectively fitted into any of the engaging grooves at a position where the first member is bent at a predetermined angle with respect to the second member and a position where the bending angle is 0 °. The bending posture of the first member is retained and the first member is bent toward the bending end point or the return side with a force exceeding a predetermined value. The spring piece is pushed inward in the radial direction by a working force, and the engagement protrusion is disengaged from the engagement groove.

  The shaft body is detachably fixed to the second member using a clip.

  The engagement groove is a tapered surface inclined in a direction in which the opposite groove side surfaces oppose each other.

  It is preferable to install at least three engagement grooves. The position where the first member is bent by a predetermined angle with respect to the second member from the position where the bending angle is 0 ° is not limited to one.

  For example, if the engagement groove is provided at a pitch of 25 ° in the circumferential direction with the maximum bending angle of the first member being 90 °, the total number of engagement grooves is 5, so that the position of the bending angle of 0 ° A total of three engaging grooves are arranged between the bending angle end position and the direction of injection can be changed in five stages.

  In this spray direction variable spray nozzle unit, the first member, the second member, the shaft body, and the clip of the pipe joint are preferably formed of a high-strength resin such as polyacetal.

Further, the shaft body is fixed by the clip by providing a locking groove with a groove bottom in parallel at a position rotated 180 ° on the outer periphery of the shaft body, and engaging the clip with the locking groove. It is preferable to carry out by a method of maintaining the engagement state of the clip with respect to the shaft body by holding with two members.

  The clip preferably includes two parallel arranged symmetrical check pawls inserted into the two locking grooves on the outer periphery of the shaft body and a bridge connecting the rear portion of each check pawl.

  Further, the holding of the clip by the second member is provided with a hole for inserting the check claw and a locking portion for engaging the barb of the check claw tip on both side walls of the second member. Is preferable.

  In addition, it is preferable that the shaft body is assembled to the shaft hole so that the shaft body cannot be rotated relative to the shaft hole by inserting a key provided on the outer periphery of the shaft body into a key groove formed on the hole surface of the shaft hole.

  In the spray direction variable spray nozzle unit of the present invention, the engagement protrusion provided on the shaft body is engaged with any one of the engagement grooves provided in the bearing hole of the first member, so that the first member relative to the second member is engaged. The bending posture (this can be considered as the bending posture of the second member with respect to the first member) is maintained.

  According to this structure, it is possible to switch the injection direction to at least three directions by setting the number of the engagement grooves to three or more, and the performance of the product can be improved.

  Further, the first member and the second member are connected by the shaft body, and further, the bending posture of the first member is maintained using the shaft body, so that the structure is not complicated, and the first member and The reliability of the connection of the second member and the durability of the shaft body are also improved.

It is sectional drawing which shows an example of the spray nozzle unit of this invention. It is a perspective view which decomposes | disassembles and shows the pipe joint of the spray nozzle unit of FIG. It is an expanded sectional view of the position along the III-III line of FIG. It is a partially broken side view which shows the bending pattern of the spray head of the spray nozzle unit of FIG. It is sectional drawing which showed the condition from which the protrusion for engagement of a attitude | position holding | maintenance mechanism removed from an engagement groove | channel. It is sectional drawing which showed the condition where the protrusion for engagement of a attitude | position holding mechanism fits in an engagement groove | channel. It is sectional drawing which shows the condition where the 1st member (spray head) of the pipe joint bent.

  Embodiments of the spray direction variable spray nozzle unit of the present invention will be described below with reference to FIGS. 1 to 7 of the accompanying drawings.

  An exemplary spray direction variable spray nozzle unit 1 is a combination of a spray head 2 and a pipe joint 10. The spray head 2 is connected to an operation rod 20 having a liquid supply path inside via a pipe joint 10 so as to be bendable. The operation rod 20 is a rod that an operator holds and operates, and includes a liquid supply path (not shown) inside.

  The illustrated spray head 2 is a combination of a nozzle 2a, a flow dividing sleeve 2b, an operation knob 2c, and a union nut 2d.

  The nozzle 2a has an injection port Jo. The diversion sleeve 2 b is liquid-tightly connected to the first member 11 of the pipe joint 10 via the O-ring 3. The operation knob 2c is for switching the injection pattern, and is screwed into a male screw on the outer periphery of the flow dividing sleeve 2b. A space between the flow dividing sleeve 2b and the operation knob 2c is liquid-tightly sealed by an O-ring 4.

  The nozzle 2a is connected to the tip of the flow dividing sleeve 2b by a union nut 2d, and the space between the nozzle 2a and the flow dividing sleeve 2b is liquid-tightly sealed by an O-ring 5.

  The diversion sleeve 2b includes a direct injection passage S1 that makes the supplied liquid go straight, and a branch passage S2 that branches to the outer periphery of the diversion sleeve 2b before the direct injection passage S1. The liquid that has passed through the branch passage S2 is formed between the nozzle 2a and the tip of the flow dividing sleeve 2b (the outer periphery of the tip has a twisted groove that causes a swirl flow). It flows forward through the annular passage S3.

  The opening degree of the annular passage S3 is changed by changing the screwing amount of the operation knob 2c. When the annular passage S3 is sufficiently open, no swirling flow is generated, and the supplied liquid flows through both the direct injection passage S1 and the branch passage S2, and the two flows merge to inject the nozzle 2a. Liquid is sprayed directly from the mouth Jo.

  On the other hand, when the annular passage S3 is closed, the liquid that has passed through the branch passage S2 is forced to pass through the spiral groove on the outer periphery of the flow dividing sleeve 2b, so that it becomes a swirling flow. The liquid is diffused and ejected in a full cone shape. The spray head 2 is not limited to the illustrated one.

  The pipe joint 10 includes a first member 11, a second member 12, two shaft bodies 13, 13 (see FIGS. 2 to 5), and two clips 14, 14 (see FIGS. 2 and 3). ) And a posture holding mechanism 15.

  The first member 11 of this pipe joint has a cylindrical portion 11a having a flow passage connection port 11d on one end side and a connecting portion 11b (see FIGS. 1 and 7) for the spray head 2 on the other end side. .

  Moreover, it has the bearing hole 11c (refer FIGS. 2-6) concentric with the axial center of the cylindrical part 11a in the both sides | surfaces of the cylindrical part 11a. The bearing hole 11c has engagement grooves 15a (see FIGS. 4 to 6) arranged on the inner peripheral surface at a plurality of intervals (three in the figure) at intervals in the circumferential direction.

  The engagement groove 15a is a groove configured as a tapered surface in which the groove side surface gs (see FIG. 5) opposed to each other is inclined in the opposite direction.

  The second member 12 has a concave portion 12a having a cylindrical surface cs that allows the cylindrical portion 11a to be pivotably attached to one end side, and a connecting portion 12b to the operating rod 20 on the other end side.

  Further, both side walls sandwiching the recess 12a have a shaft hole 12c, a key groove 12d, a claw insertion hole 12e, and a claw locking portion 12f for locking a check claw described later.

  The shaft hole 12c penetrates each side wall portion of the second member 12 in the axial direction. The key groove 12d is formed to extend in the axial direction in the circumferential direction of the shaft hole 12c.

  Further, the claw insertion hole 12e is formed in each side wall portion of the second member 12 so as to penetrate from the outer periphery of each side wall portion to the shaft hole 12c.

  The shaft body 13 is a shaft that becomes a pivot point of the cylindrical portion 11a, and is inserted into the shaft hole 12c and the bearing hole 11c. As a result, both side portions of the cylindrical portion 11 a are rotatably supported by the shaft body 13.

  The shaft body 13 shown in the figure is provided with a cantilevered spring piece 13a integrally formed on the tip side. Further, two locking grooves 13b having parallel groove bottoms are formed on the outer periphery of the rear portion of the shaft body 13, and a key 13c to be inserted into the key groove 12d is formed.

  The free end of the spring piece 13a can be displaced in the radial direction, and has an engaging projection 13d on the outer peripheral surface of the free end. The engaging protrusion 13d is a tapered tapered protrusion corresponding to the engaging groove 15a, and the engaging protrusion 13d is selectively fitted into any of the engaging grooves 15a.

The posture holding mechanism 15 is a combination of the bearing hole 11c, the shaft hole 12c, the shaft body 13, the engagement groove 15a, and the spring piece 13a.
Thus, the bending posture of the first member 11 is maintained.

  Specifically, when the first member 11 is located at a bending angle of 0 ° with respect to the second member 12, a position bent by a predetermined angle from the position of the bending angle 0 °, and a bending end point 13d. Is fitted (engaged) into the engaging groove 15a at the corresponding position.

  Thereby, resistance is applied to the rotation of the first member 11, and the bending posture of the first member 11 (that is, the bending posture of the spray head 2) is stably maintained.

  The engagement state of the engagement protrusion 13d with respect to the engagement groove 15a is such that the taper contact between the engagement groove 15a and the engagement protrusion 13d occurs when the first member 11 is bent to the bending end point side or the return side with a force exceeding a predetermined value. The free end side of the spring piece 13a is pushed inward in the radial direction by the component force acting on the surface and can be released.

  The clip 14 is removably engaged with the second member 12. In the illustrated clip 14, two symmetrically arranged check pawls 14a that are individually inserted into the two locking grooves 13b and a bridge 14b that connects the rear portion of each check pawl 14a are integrated. A molded resin clip is used.

  The check claw 14a is inserted into the claw insertion hole 12e, and the tip end is locked to the claw locking portion 12f to be prevented from coming off from the claw insertion hole 12e. In the retaining state, the check pawl 14a is inserted into a locking groove 13b provided on the outer periphery of the shaft body 13, and thereby the shaft body 13 is retained from the shaft hole 12c. At this time, the bridge 14 b is fitted into a groove provided on the outer periphery of the side wall portion of the second member 12.

The check claw 14 a also has a function of preventing the shaft body 13 from rotating. Accordingly, the key 13c is not necessarily required (the key groove 12d is necessary for passing the engaging protrusion 13d).
However, when the key 13c is inserted into the key groove 12d, the posture of the shaft body 13 can be fixed and the check pawl 14a can be inserted into the locking groove 13b, so that the pipe joint 10 can be easily assembled.

  The second member 12 has a channel connection port 12g corresponding to the channel connection port 11d of the first member.

  One of the flow path connection ports 11d and 12g (11d in the drawing) is a port extending long in the bending direction of the first member 11.

  In addition, the positional relationship between the cylindrical portion 11a having the flow path connection port 11d and the recess 12a having the flow path connection port 12g may be reversed from the drawing. That is, the cylindrical portion 11 a may be provided in the second member 12, and the concave portion 12 a may be provided in the first member 11.

  In the spray direction variable spray nozzle unit 1 configured as described above, the O-ring 16 that seals the periphery of the flow path connection port 11d is assembled in the seal groove 11e provided in the first member 11, and in this state, the cylindrical portion 11a. Is inserted into the recess 12 a of the second member 12.

  Further, the two shaft bodies 13 are inserted into the shaft hole 12c of the second member 12 and the bearing hole 11c of the first member 11, and then the clip 14 is inserted into the claw insertion hole 12e for assembly. Since this operation is simple and easy to perform, it is excellent in assembling.

  In the spray direction variable spray nozzle unit 1 that has been assembled, the first member 11 is bent with respect to the second member 12 at a bending angle of 0 °, a position where the bending angle is 0 °, and a bending end point position. The engaging protrusion 13d engages with the engaging groove 15a at the corresponding position.

  Thereby, the bending attitude | position of the 1st member 11 is stably hold | maintained in multiple places (the spray nozzle unit of a figure is 3 places).

  According to this structure, three or more engagement grooves 15a can be provided, and the demand for fine adjustment in the injection direction can be met.

  In addition, since the components of the pipe joint 10 including the posture holding mechanism 15 are only the first member 11, the second member 12, the shaft body 13, the clip 14, and the O-ring 16, the structure is not complicated.

DESCRIPTION OF SYMBOLS 1 Injection direction variable spray nozzle unit 2 Spray head 2a Nozzle Jo Injection port 2b Diverging sleeve S1 Direct injection path S2 Branching path S3 Annular path 2c Operation knob 2d Union nut 3, 4, 5 O-ring 10 Pipe joint 11 First member 11a Cylinder Part 11b Connecting part 11c Bearing hole 11d Flow path connection port 11e Seal groove 12 Second member 12a Recess cs Cylindrical surface 12b Connection part 12c Shaft hole 12d Key groove 12e Claw insertion hole 12f Claw locking part 12g Channel connection port 13 Shaft body 13a Spring piece 13b Locking groove 13c Key 13d Engaging projection 14 Clip 14a Checking claw 14b Bridge 15 Posture holding mechanism 15a Engaging groove gs Groove side face 16 O-ring 20 Operating rod

Claims (3)

A spray direction variable spray nozzle unit combining a spray head (2) and a pipe joint (10), wherein the pipe joint (10) includes a first member (11), a second member (12), and a posture holding mechanism. (15)
The first member (11) has a cylindrical portion (11a) having a flow path connection port (11d) on one end side, and a connecting portion (11b) for either the spray head (2) or the operating rod (20). On the other end side,
The second member (12) has a concave portion (12a) provided with a cylindrical surface (cs) that allows the cylindrical portion (11a) to be pivotably attached to one end side, and the spray head (2) and the operation rod (20). ) Each having a connecting portion (12b) on the other end side,
One of the flow path connection ports (11d) and (12g) provided corresponding to the abutting surface of the cylindrical portion (11a) and the cylindrical surface (cs) extends in the bending direction of the first member (11). And
The posture holding mechanism (15) includes a bearing hole (11c) provided on both side surfaces of the cylindrical portion (11a) and a shaft hole (12c) provided through both side wall portions of the second member (12). ), A shaft body (13) that is inserted into the shaft hole (12c) and the bearing hole (11c) and rotatably supports the cylindrical portion (11a), and circumferentially on the inner peripheral surface of the bearing hole (11c). A plurality of engaging grooves (15a) installed at intervals, a free-moving spring piece (13a) provided in a cantilevered state on the shaft body (13), and the spring An engaging projection (13d) provided at the free end of the piece (13a);
The engaging protrusion (13d) is inserted into any of the engaging grooves (15a) at a position where the first member (11) is bent at a predetermined angle with respect to the second member (12) and at a bending angle of 0 °. ) Is selectively fitted and the bending posture of the first member (11) is maintained, and the first member (11) is bent to the bending end point side or the return side with a force exceeding a predetermined value. The spring piece (13a) is pushed radially inward by a component force acting on the contact surface between the engagement groove (15a) and the engagement protrusion (13d), and the engagement protrusion (13d) with respect to the engagement groove (15a). ) The spray direction variable spray nozzle unit configured to be disengaged.   The engagement groove (15a) is a tapered surface inclined in a direction in which opposite groove side surfaces oppose each other, and at least three engagement grooves (15a) are provided at intervals in the circumferential direction. Item 4. The spray direction variable spray nozzle unit according to Item 1.   The spray direction variable spray nozzle unit according to claim 1 or 2, wherein the shaft body (13) is detachably fixed to the second member (12) using a detachable clip (14).

Images