JPH067881U - Support device for rotary cleaning nozzle - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate sliding resistance when the nozzle body rotates and ensure smooth rotation. A nozzle body 9a, 11a, 13a having a cleaning injection hole 17 and a rotation injection hole 23 is provided with a vertically extending through hole 27 at approximately the center of the upper and lower surfaces thereof. In a supporting device for a rotary cleaning nozzle, which is rotatably fitted and supported on a main shaft 25 that also serves as a flow path through which cleaning water sent from a pump is fed, in either the upper surface side or the lower surface side of the nozzle bodies 9a, 11a, 13a. A bearing member 29 having a shaft hole 29a having a diameter smaller than the hole diameter of the through hole 27 is provided in one of the through holes 27, and the first shaft 25 is rotatably fitted into the main shaft 25 while being fitted into the shaft hole 29a of the bearing member 29. The shaft diameter portion 33 and the second shaft diameter portion 35 that is rotatably fitted and inserted into the through hole 27 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a support device for a rotary cleaning nozzle.

[0002]

[Prior art]

 Conventionally, in automatic washing machines for washing flasks, test tubes, etc., the washing water is not concentrated in one place, but is washed while rotating the washing nozzle so that the washing water hits the whole area. A specific example of is shown in FIG.

In FIG. 5, reference numeral 101 denotes a nozzle main body of a cleaning nozzle. The nozzle main body 101 has an injection hole 103 for injecting cleaning water for cleaning upward and a main shaft 105 as a vertical axis. It has a shape having a pair of left and right injection holes 107 for rotation, which inject in the tangential direction of the center rotation locus to give a rotational force to the nozzle body 101.

In addition, a through hole 109 that penetrates vertically is provided in a substantially central portion of the nozzle body 101, and the through hole 109 is provided with respect to the main shaft 105 that also serves as a flow passage 111 through which cleaning water is fed. The upper end is rotatably fitted, and the upper end is restricted by the flange 115 of the cap 113 screwed to the main shaft 105, and the lower end is restricted by the flange 117 provided on the main shaft 105 in the axial direction. It has a support structure that allows it to rotate in the state.

[0005]

[Problems to be solved by the device]

 As described above, the wash water is sent from the pump (not shown) into the nozzle body 101 via the main shaft 105, so that the wash water is vigorously jetted from the jet holes 103 for washing. At the same time, the cleaning water is jetted vigorously from the jetting holes 107 for rotation, and the nozzle body 101 rotates about the main axis 105, which is the vertical axis, by the thrust due to the jetting pressure.

When the nozzle body 101 is rotated, a large load FA downward in the thrust direction acts on the nozzle body 101 due to a reaction at the time of jetting from the jetting holes 103 for cleaning. The load in the thrust direction becomes a sliding resistance, which is a factor that hinders the rotation of the nozzle body 101. For this reason, the pump that feeds the cleaning water is made larger, but the cost is increased and the size of the entire device is increased.

Therefore, in this invention, it was confirmed as a result of an experiment that a load is generated in the thrust direction when the diameters of the through holes on the upper surface side and the lower surface side provided in the nozzle body are almost the same. Therefore, it is an object of the present invention to provide a support device for a rotary cleaning nozzle that can prevent sliding resistance from occurring when the nozzle body rotates by a simple device and can obtain a smooth rotary motion.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a vertically penetrating through hole at approximately the central portion of the upper and lower surfaces of a nozzle body having a cleaning jet hole and a rotating jet hole. In a rotary cleaning nozzle support device that is rotatably fitted and supported by a main shaft that also serves as a flow path for the cleaning water sent from the pump, and is installed in either the upper surface side or the lower surface side of the nozzle body. While providing a bearing member having a shaft hole having a diameter smaller than that of the through hole, a first shaft diameter portion rotatably fitted into the shaft hole of the bearing member is rotatably fitted into the main shaft. A second shaft diameter portion to be inserted is provided.

[0009]

[Action]

 According to the cleaning nozzle support device, the cleaning water is pumped into the nozzle body through the main shaft, so that the cleaning water is vigorously sprayed from the cleaning spray hole. At the same time, the washing water is jetted vigorously from the jetting water for rotation, and the thrust of the jetting pressure causes the nozzle body to rotate about the main axis. When the nozzle body rotates, the diameter of the shaft hole of the bearing member is smaller than the diameter of the through hole. Pressure is generated and balanced. As a result, the sliding resistance at the time of rotation becomes close to zero, and the nozzle body can ensure smooth rotation even with a small pump.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings of FIGS.

In FIG. 1, reference numeral 1 shows a cleaning chamber of the automatic cleaning machine 3.

The cleaning chamber 1 is divided into two stages, an upper cleaning unit 5 and a lower cleaning unit 7. The upper cleaning unit 5 includes a first cleaning nozzle 9 and a second cleaning nozzle 11, and a lower cleaning unit. A third cleaning nozzle 13 is arranged in the section 7, and the upper cleaning section 5 can be cleaned from above and below by the first and second cleaning nozzles 9 and 11. Further, in the lower cleaning section 7, the third cleaning nozzle 13 enables cleaning from below.

The nozzle bodies 9a, 11a, 13a of the first, second, third cleaning nozzles 9, 11, 13 are formed in a horizontally long box shape, and the upper surface 15 is provided with a cleaning injection hole 17 for cleaning. A large number of injection holes 23.23 for rotation are provided on the outer sides of the front surface 19 and the rear surface 21 in the tangential direction of the rotation locus W and have different 180-degree directions. .

Further, through holes 27, 27 rotatably fitted in and supported by the main shaft 25 are provided at substantially central portions of the upper surface 15 and the lower surface 16 of the nozzle bodies 9a, 11a, 13a. .

A synthetic resin bearing member 29 having a shaft hole 29 a having a diameter D 2 smaller than the hole diameter D 1 of the through hole 27 is integrally fixed to the through hole 27 on the upper surface side with a screw 31. The main shaft 25 side corresponding to the bearing member 29 is a first shaft diameter portion 33 that is rotatably fitted and inserted into the shaft hole 29a of the bearing member 29.

The main shaft 25 is directly fitted and supported in the through hole 27 on the lower surface side, and the support shaft 25 side corresponding to the through hole 27 has the second shaft diameter portion 35, and the relationship of D1> D2 is satisfied. Has become.

The diameter D2 of the hole of the shaft hole 29a is set based on the load FA in the thrust direction generated downward by the injection pressure injected from the cleaning injection hole 17.

That is, by making the hole diameters of the through holes 27, 27 of the nozzle bodies 9a, 11a, 13a large and small, the load obtained by applying the internal pressure to the area difference of the through holes 27 has a smaller hole diameter. An upward differential pressure is generated at.

Here, the slight load acting on the nozzle bodies 9a, 11a, 13a is FA (kg), the larger hole diameter of the through holes 27 is D1 (m), and the shaft of the smaller bearing member 29. The diameter of the holes 29a is D2 (m), the diameter of the injection holes 17 for cleaning is d (m), the number is n, the water pressure is P (kg / m ² ), and the retained water of the nozzle bodies 9a, 11a, 13a is When these relationships are shown as an equation for the included self-weight (Wkg), FA = W ± F ± π / 4 (D ₁ 2 −D ₂ ² ) × P. Note that F is the thrust (kg) of water sprayed from the spray hole 17, and is calculated by the following equation.

F = K × ρ × Q × v = K × π / 2 × d ² × n × P K: Coefficient [−] Q: Flow rate [m ³ / s] of water ejected from the cleaning injection hole v: speed of jet water [m / s] Therefore, if the value of D2 is set so that FA = 0 due to the differential pressure FV having the opposite direction to the thrust load FA, the thrust load FA can be made almost zero. It is possible. Specifically, assuming that 50 nozzles 17 for cleaning having a diameter of 2 mm are provided on the upper surface of the nozzle bodies 9a, 11a, 13a, and that water pressure acts on 0.3 kg / cm ² , FA = 0 W = 1 kg K = 0.7 d = 0.002 m n = 50 P = 0.3 × 10 ⁴ kg / m ^{2 When} D1 = 0.05 m is inserted into the above formula, 0 = 1 + 0.7 × π / 2 × 0.002 ² From D50 = 0.3 × 10 ⁴ −π / 4 (0.05 ² −D ₂ ² ) × 0.3 × 1D ⁴ , D2 becomes D2 = 0.0424 m.

Therefore, in the case of the calculation example, if the inner diameter of the shaft hole 29a of the bearing member 29 is set to 42.4 mm, the thrust load FA can be made substantially zero.

On the other hand, the threaded portion of the cap 37 is screwed onto the upper end of the main shaft 25, and the collar portion 39 of the cap 37 acts on the upper surface of the bearing member 29. As a result, the main shaft 25 and the nozzle bodies 9a, 11a, 13a are rotatably supported by the flange portion 39 of the cap 37 and the step portion 41 of the bearing member 29 in a state in which the vertical movement is restricted.

The main shaft 25, on which the first, second and third cleaning nozzles 9, 11, 13 are rotatably mounted, has a pipe 47 extending from the discharge port 45 of the pump 43 with the internal space serving as a flow path. It is in communication with.

Further, the intake port 49 of the pump 43 is connected and communicated with a water tank 53 provided in the bottom portion 51 of the cleaning chamber 1 via a pipe 55.

The water tank 53 is configured such that washing water and detergent water from a detergent tank 57 containing a detergent flow in through the bottom surface of the washing chamber 1, and a supply valve 59 is provided to the bottom portion 51 of the washing chamber 1. The first wash water supply pipe 61, which is controlled to be openable and closable, faces.

A second wash water supply pipe 65, which is controlled to be openable and closable by a supply valve 63, is connected to the detergent tank 57.

According to the support device for the rotary cleaning nozzle thus configured, the cleaning water sent from the pump 43 is sent into the nozzle bodies 9a, 11a, 13a via the main shaft 25 for cleaning. The cleaning water is vigorously ejected from the injection hole 17 of the. In this case, the first cleaning nozzle 9a sprays downward. At the same time, the cleaning water is jetted vigorously from the jetting hole 23 for rotation, and the nozzle bodies 9a, 11a, 13a are rotated about the main shaft 25 as a fulcrum by the thrust due to the jetting pressure.

When the nozzle bodies 9a, 11a, 13a are rotated, the differential pressure FV of the same force is applied in a direction opposite to the thrust load FA at the time of injection injected from the cleaning injection hole 17 by 180 degrees. Occurs and is balanced. In addition, in the first cleaning nozzle 9a, the thrust load FA acts upward and the differential pressure FV acts downward. As a result, the sliding resistance at the time of rotation becomes close to zero, and smooth rotation can be secured even with a small pump.

[0029]

[Effect of device]

 As described above, according to the present invention, one of the through holes of the nozzle body to be inserted into the main shaft is the same as the thrust load in the supporting portion in the opposite direction by a simple device to reduce the hole diameter by the bearing member. Since the differential pressure can be secured and the sliding resistance can be made close to zero, smooth rotation can be obtained even with a small pump.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a nozzle body mounted on a spindle.

FIG. 2 is an overall explanatory view of an automatic washing machine embodying the present invention,

FIG. 3 is a plan view of a nozzle body,

FIG. 4 is a schematic sectional view of the nozzle body,

5 is a sectional view similar to FIG. 1 showing a conventional example,

[Explanation of symbols]

 9a, 11a, 13a Nozzle body 17 Injection hole for cleaning 23 Injection hole for rotation 25 Main shaft 27 Through hole 29 Bearing member 29a Shaft hole 33 First shaft diameter portion 35 Second shaft diameter portion

Claims (1)

[Scope of utility model registration request] 1. A through hole that vertically penetrates is provided in substantially the central portion of the upper and lower surfaces of a nozzle body having a cleaning injection hole and a rotation injection hole, and the through hole is discharged from a pump. In a supporting device for a rotary cleaning nozzle that is rotatably fitted and supported on a main shaft that also serves as a flow path for feeding water, a diameter smaller than the hole diameter of the through hole in either the upper surface side or the lower surface side of the nozzle body. While the bearing member having the shaft hole is provided, the first shaft diameter portion rotatably fitted into the shaft hole of the bearing member and the second shaft diameter portion rotatably fitted into the through hole are directly inserted into the main shaft. A support device for a rotary cleaning nozzle, characterized by being provided with.