JP4747069B2 - Drainage structure of washing tank - Google Patents

Description

  The present invention relates to a drainage structure of a washing tank that can improve drainage efficiency in a washing tank that stores washing water for washing piping, for example, a vertical washing tank of a pipeline milker.

  In the food manufacturing industry, it is desirable that piping equipment in contact with food is always hygienic. For example, milker teat cups, feeding tubes, receiver tanks, and the like are in direct contact with milk and bovine body, so it is necessary to keep them clean and prevent the propagation of germs. Therefore, before and after each milking operation, washing milk such as warm water, acidic / alkaline washing water, etc. must be run through the milking line in a predetermined order to remove residual milk.

  There are several types of methods for cleaning the feeding line, the milking unit, and the like depending on the configuration of the milker. FIG. 1 shows a method using a vertical cleaning tank. At the time of milking, the milk in the milking unit 30 is collected in the receiver tank 20 by applying a milking vacuum pressure to the milk pipe P1 by the vacuum pump 10, and further transferred to the bulk cooler 50 through the milking pipe P2 by the milk pump 40 and stored in a cooled state. . A washing water recovery pipe P3 branches from the discharge side of the milk pump 40 of the pipe P2 and communicates with a recovery port 60a at the bottom of the cleaning tank. A washer 90 is provided for each milking point, and a cleaning liquid suction pipe P4 is branched from the pipe P1 via the three-way valve V1 and connected to the cleaning tank 60. (The milking vacuum pressure line is omitted.) The vertical washing tank is excellent in space efficiency and has an advantage of being hygienic by covering the opening.

  FIG. 2 is a longitudinal sectional view showing an example of the drainage structure of the vertical cleaning tank. The suction pipe P4 penetrates from the upper part of the vertical cleaning tank 60, is fixed downward using a hose band, a hanger, or the like, and the lower end faces the bottom surface 60b of the cleaning tank. Further, a horizontal pipe P5 is connected to the lower end of the recovery pipe P3 descending to the side of the cleaning tank 60. One of the horizontal pipes P5 is opened to a drainage passage (not shown) via a drainage valve 80, and the other is upward at the center of the bottom. And is connected to the drain port 60a. With such a configuration, the washing water is drained directly into the drainage channel without returning to the washing tank at the time of pouring or completion of washing.

  In order to circulate and clean the pipes of this system, first, the cleaning tank 60 is filled with a necessary cleaning liquid to a predetermined height, the pipe P2 to the bulk cooler 50 is connected to the recovery pipe P3 side, and the pumps 10 and 40 are driven. The cleaning liquid sucked up from the pipe P4 enters the receiver tank 20 through the pipe P1, and returns to the cleaning tank 60 through the recovery pipe P3. In the case of the end of the cleaning or the flush cleaning, when the drain valve 80 is opened, the returned cleaning liquid is discharged, and the cleaning ends when the cleaning liquid in the cleaning tank 60 runs out. Thereafter, the washing water remaining in the washing tank is discharged from the drain outlet.

Japanese Patent Application Laid-Open No. 9-56288 discloses an invention relating to an improvement of a drainage structure of a cleaning system using a large cleaning tank. In this system, when the milking unit is suspended at the connection port of the pipe P1 passing above the washing tank, and the pump is driven with the tip of each teat cup immersed in the washing liquid, the washing liquid sucked up inside the milking unit is connected to the pipe. Circulate and wash. It is disclosed that a reverter of the cleaning liquid to be drained is prevented by providing a deverter including a coil spring and a valve body that is opened and closed by water pressure at the drain port of the cleaning tank.
JP-A-9-56288

  When cleaning piping, cleaning water that has become dirty or has fallen in temperature must be drained without being circulated again. However, the cleaning water that should be drained from the drain valve is not drained normally and is returned to the cleaning tank and sucked again. If this happens, it will cause contamination of the piping, which is a problem. This can be solved by providing a dedicated electromagnetic on-off valve in the return pipe to the drain outlet, but a large one is required, which increases the cost. The invention of Japanese Patent Laid-Open No. 9-56288 solves this problem by providing a valve at the drain of the washing tank. However, since a mechanical switch is used, there is still a problem that the structure becomes complicated.

  Further, the cleaning tank needs to store an amount of cleaning water that does not suck air from the suction port while the cleaning liquid goes around the pipe and returns. Since the required amount of cleaning water increases as the position of the suction port increases, it is desirable to lower the suction port in order to save cleaning water. However, if the position of the suction port is lowered so much that the clearance is insufficient, there is a risk that poor suction will occur. In particular, in the case of a vertical washing tank, the suction pipe may be lowered by its own weight over time, which is a problem.

  Therefore, the present invention provides a re-intake of cleaning water that should be discharged with a stable flow between the suction port and the lower end of the suction pipe between the suction port and the drain port by a drain port having a simple structure that does not use an opening / closing device. The purpose of this is to make it difficult to cause inhalation, and to prevent inhalation failure due to insufficient clearance between the suction port and the bottom of the washing tank.

  The invention described in claim 1 is a cleaning tank for storing a cleaning liquid for forced circulation in a pipe for cleaning, and has a horizontal plate and a vertical plate suspended below the three sides of the horizontal plate. The above problem is solved by the drainage structure of the cleaning tank, in which the suction plate is installed on the bottom surface of the cleaning tank, and the horizontal plate faces the opening of the cleaning liquid suction port. The cleaning liquid suction port is the lower end opening of the cleaning liquid suction pipe when the present invention is applied to a vertical cleaning tank.

  The drainage structure of the cleaning tank of the present invention is provided with a suction plate that faces the opening for sucking the cleaning liquid and restricts the flow of the cleaning liquid between the opening and the drain, so that the negative pressure at the suction port is discharged. Prevent re-inhalation of cleaning fluid to be discharged through the outlet. The leg portion may be fixed to the bottom surface of the washing tank, but is preferably movable in accordance with the position of the washing water inlet.

  According to a second aspect of the present invention, in the drainage structure of the cleaning tank according to the first aspect, a plurality of holes are formed in the horizontal plate. The plurality of holes drilled in the horizontal plate have the effect of stabilizing the flow, and also have the effect of preventing poor suction even when the clearance from the horizontal plate is insufficient for some reason. This configuration is particularly effective in a vertical cleaning tank in which the suction pipe tends to be problematic due to its own weight.

  According to a third aspect of the present invention, in the drainage structure of the cleaning tank according to the first or second aspect, a vertical plate is erected above one edge of the horizontal plate of the suction plate, and two vertical plates are provided on the floor vertical plate. Provide mounting holes. Then, the belt passed through the mounting hole is wound around the lower end portion of the cleaning liquid suction port to fix the suction port and the suction plate. Preferably, a vertical plate having two long holes is provided above the edge of the open side where no lower vertical plate is provided, and a hose band passed through the long hole is formed around the lower end of the suction pipe. The suction pipe and the suction plate are tightly fixed by winding. That is, the position of the opening and the horizontal plane is stabilized by fixing the suction port to the vertical plate.

  According to a fourth aspect of the present invention, in the drainage structure of the cleaning tank according to any one of the first to third aspects, the suction port is provided at a position shifted on a plane from the drainage port of the cleaning tank, and the middle of the three vertical plates. The suction plate is installed so that the vertical plate located at the position of is directly opposite the drain of the washing tank. The function as a baffle board is improved by installing it so that the middle side may become the side close | similar to a drain outlet among the vertical boards arrange | positioned in planar U shape.

  A fifth aspect of the present invention is the drainage structure of the cleaning tank according to any one of the first to fourth aspects, wherein the recovery pipe that has descended to the side of the cleaning tank is horizontally bent and passed under the cleaning tank, opposite to the cleaning tank. In addition to being connected to the drainage channel via a drainage valve installed on the side, the return pipe is branched upward from the bottom of the discharge port at the bottom of the washing tank and connected to the discharge port. By making the return pipe to the discharge port into an upper branch, it is difficult to cause re-inhalation of the cleaning liquid to be discharged even when a negative pressure is generated from the cleaning tank.

  According to each of the above inventions, it is possible to effectively prevent poor cleaning due to insufficient clearance of the opening of the suction port of the cleaning tank and re-inhalation of the cleaning water to be discharged. It can be. In addition, by regulating the flow of the cleaning water, an efficient cleaning tank can be configured.

  Hereinafter, specific embodiments when the present invention is applied to a vertical cleaning tank will be described with reference to the drawings. FIG. 3 is a longitudinal sectional view of the cleaning tank according to the present invention, but the piping is shown in a side view for simplicity. Further, since the overall configuration of the milker is substantially the same as that of FIG. 1, the same numbers are used. The vertical washing tank 60 has a drain port 60a at the center of the bottom 60b, and the top is closed by a lid 60d. The suction pipe P4 is inserted through the eccentric part of the lid 60d, and the lower end opens to the periphery of the drain port 60a. On the other hand, the collection pipe P3 descending to the side of the cleaning tank 60 is bent horizontally at a position lower than the bottom of the cleaning tank and passes through the lower side of the cleaning tank 60, and through the drain valve 80 on the opposite side. (Not shown). A return pipe P5 branches from the recovery pipe P3 directly below the drain port 60a and is connected to the drain port 60a. A suction plate 1 is installed below the suction pipe P4.

  FIG. 4 is a three-side view and a perspective view of the suction plate 1. The suction plate 1 is mainly composed of a substantially square horizontal plate 1a, vertical plates 1b, 1c and 1d depending from three sides of the horizontal plate 1a, and a vertical plate 1e standing upright from the other side. These can be created by bending a punched steel sheet. In this embodiment, adjacent edges of the vertical plates 1b, 1c, and 1d are in close contact with each other to form leg portions having a U-shaped horizontal section as a whole. A pair of vertically long holes 1f are provided along the left and right sides of the vertical plate 1e, and the suction pipe P4 and the suction plate 1 are connected by winding the lower end of the suction pipe P4 through a hose band. . The horizontal plate 1a has a large number of small holes 1g.

  In order to circulate the washing water in the pipe using the washing tank having the drainage port having such a structure, each teat cup 30a is connected to the nearby washer 90 and the three-way valve V1 is operated in the same manner as above. The suction pipe P4 and the pipe P1 are connected. When the pipe P2 to the bulk cooler 50 is switched to the recovery pipe P3 side and the pumps 10 and 40 are driven, the wash water sucked up inside the milking unit 30 enters the receiver tank 20 through the pipe P1, and the recovery pipe P3. It returns to the washing tank 60 through.

  The flow of cleaning water in the cleaning tank at this time is indicated by arrows in FIG. A part of the washing water flowing in from the drain port 60a passes through a large number of small holes 1g drilled in the horizontal plate 1a to reach the lower end of the suction pipe P4 and is re-inhaled. The other part comes out of the legs of the suction plate 1 from one side where the vertical plates 1b to 1d do not exist, and then goes around the edge of the horizontal plate 1a to reach the lower end of the suction pipe P4. In this embodiment, since the lower end of the suction pipe P4 is fixed to the vertical plate 1e, the suction pipe P4 is prevented from falling due to its own weight and insufficient clearance. Furthermore, the filter effect is exhibited by a large number of small holes 1g drilled in the horizontal plate 1a.

  In order to drain the washing water after pouring or finishing the washing, when the drain valve 80 is opened and the pumps 10 and 40 are driven, the washing water returned to the recovery pipe P2 passes through the drain valve 80 to a drain channel (not shown). Released. At this time, the suction plate 1 acts as a baffle plate in the cleaning tank 60, and the negative pressure of the suction pipe P4 is prevented from being directly applied to the drain port, so that the cleaning water is re-inhaled from the drain port 60a. There is nothing. And the washing | cleaning is complete | finished when the liquid level in the washing tank 60 becomes lower than the lower end of the suction pipe P4.

  FIG. 5 is a plan view showing the attachment position of the suction plate in the cleaning tank in another embodiment. There is a drain port 60a in the center, and the lower end of the suction pipe P4 opens at a position shifted from the drain port 60a. When the suction plate 1 is fixed so that the horizontal plate 1a comes into contact with the opening of the suction pipe P4, the washing water flowing in from the drain port 60a goes around the vertical plates 1b and 1d on both sides and enters the lower side of the horizontal plate 1a. From there, it passes through the small hole 1g of the horizontal plate 1a and reaches the opening of the suction pipe P4, so that the baffle plate function of the suction plate 1 is exhibited, and the flow of the washing water is further stabilized. By efficiently arranging the suction ports, it can be expected to reduce the size of the washing tank and reduce the amount of washing water required.

  Although the case where this invention is used for the drain outlet of a vertical washing tank was demonstrated above, the drainage structure of the washing tank of this invention is applicable also to the milking parlor which uses a large sized washing tank. Moreover, it is thought that it is applicable also to the washing tank used for piping washing other than a milker.

  In the present invention, since the teat cup is reliably cleaned with a simple structure to improve the quality of milk and to save washing water, there is a great industrial applicability.

It is explanatory drawing which shows the piping system of a typical milking apparatus. It is a longitudinal cross-sectional view which shows an example of piping around the conventional washing tank. It is a longitudinal cross-sectional view which shows the drainage structure of the washing tank which concerns on this invention. FIG. 4 is a three-side view and a perspective view showing details of the suction plate of FIG. 3 and a flow of cleaning water. It is explanatory drawing which shows an example of plane arrangement | positioning of the suction plate of this invention.

Explanation of symbols

1 Suction Plate 1a Horizontal Plate 1b Vertical Plate 1c Vertical Plate 1d Vertical Plate 1e Vertical Plate 1f Long Hole 1g Small Hole

60 Washing tank 70 Each connection port 80 Drain valve

P3 suction pipe

Claims (5)

  In a cleaning tank for storing cleaning water for cleaning pipes, a suction plate having a horizontal plate and a vertical plate suspended below the three sides of the horizontal plate is installed on the bottom surface of the cleaning tank. A drainage structure for a cleaning tank, wherein the horizontal plate faces the opening of the cleaning liquid suction port.   The drain structure for a washing tank according to claim 1, wherein a plurality of holes are formed in the horizontal plate.   A vertical plate provided with a plurality of mounting holes above one edge of the horizontal plate is erected, and a belt passing through the mounting hole is wound around the lower end portion of the cleaning liquid suction port, whereby the pipe and the suction plate The drainage structure for a washing tank according to claim 1 or 2, wherein   The suction port is provided at a position displaced on a plane from the drain port of the cleaning tank, and the suction plate is positioned so that the vertical plate located in the middle of the three vertical plates faces the drain port of the cleaning tank. 4. A drainage structure for a cleaning tank according to claim 1, wherein a plate is provided.   The recovery pipe that has descended to the side of the washing tank is bent horizontally and passed under the washing tank, connected to the drainage channel via the drain valve installed on the opposite side of the washing tank, and the outlet at the bottom of the washing tank 5. The drainage structure for a washing tank according to claim 1, wherein the return pipe is branched upward from the bottom and connected to the discharge port.

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