JP2520393Y2 - Liquid injector for closed aquarium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a liquid injector for a closed water tank, for example, a liquid injector for filling a liquid in a closed water tank used for measuring the performance of an ultrasonic probe. Regarding

[Prior Art] A water tank for an ultrasonic probe is used as a phantom for measuring the performance of an ultrasonic diagnostic apparatus. A liquid such as water is filled inside the tank and used as an ultrasonic reflector. It is configured by stretching multiple threads or installing a steel ball target, and the performance of the probe, such as focus point, sensitivity, resolution, etc., is measured by transmitting ultrasonic waves into this water tank. It is a thing.

In such an ultrasonic probe water tank, it is necessary to almost accurately receive a reflection echo from a thread or a steel ball as a reflector installed inside. That is, when air bubbles, dust, and the like are mixed in the water tank, reflection of ultrasonic waves on them causes deterioration of the image quality and a virtual image, which adversely affects the image. Therefore, the performance of the ultrasonic probe cannot be accurately measured in the water tank containing such bubbles. For this reason, the water tank must be a container that can be hermetically sealed, and must be completely filled with a liquid such as water and in a state in which air bubbles are not mixed. Conventionally, in the case of filling water in such a water tank without mixing air bubbles, for example, as shown in FIG. 3, a water reservoir case in which the entire ultrasonic probe water tank 10 is installed in a processing case 12. 14 inside, and the inside of the processing case 12 is depressurized by sucking internal air from the exhaust port 12a,
The water in the water storage case 14 is introduced into the water tank 10 by vacuum deaeration to fill the water tank 10.

However, in such a water filling method, since the entire water tank 10 is immersed in water, it is necessary to wipe off the water attached to the water tank 10 after the water filling operation is completed, which is troublesome. was there.

Further, as shown in FIG. 4, the adapter 16 storing water is attached to the water tank 10 left in the processing case 12 to reduce the pressure in the processing case 12, and water is injected into the water tank 10 by vacuum deaeration. You can also In this case, it is necessary to configure the adapter 16 to have a volume of the water tank 10 or more, and
Since it was necessary to ensure that water from the adapter 16 could be smoothly poured to the aquarium 10 side, it took time to manufacture the adapter 16.

Therefore, as shown in FIG. 5, a method of directly injecting the liquid into the water tank 10 using the liquid injector 18 is also performed. The liquid injector 18 is composed of a cylinder 20 and a piston 22 that is inserted into the cylinder 20, and has an injection port at the tip of the cylinder 20.
24 is formed to project.

On the other hand, a stopcock 26 is closely attached to the water tank 10 side,
An injection passage 28 is formed in the stopcock 26. Although not shown, an air passage for venting air is formed in the upper wall of the water tank 10 or the stopcock 26.

Liquid is poured into the water tank 10 by such a liquid injector 18, vacuum deaeration is performed by the suction operation of the liquid injector 18 in a substantially filled state, and residual bubbles are removed, and the water tank 10 is completely filled with liquid. I am trying to let you.

[Problems to be Solved by the Invention] However, in the liquid injection and the removal of bubbles by the above-described conventional liquid injector 18, the injection port 24 of the cylinder is opened every time the injection of the liquid in the cylinder 20 of the liquid injector 18 is completed. Stopcock
Must be pulled out of 26. Then, the operation of newly replenishing the cylinder 20 with the liquid needs to be repeated until the inside of the water tank 10 is almost filled with the liquid. Further, after the liquid is almost filled, vacuum deaeration is performed by the suction operation by the liquid injector 18 to remove the bubbles remaining in the water tank 10. However, since the vacuum deaeration operation is performed well, the liquid injector 18
Is brought into the state shown in FIG. That is, the cylinder 20
A predetermined amount of liquid is put inside, and an air portion 29 is secured above it. Therefore, in order to bring the liquid injector 18 into such a state, after the water tank 10 is almost filled with the liquid, the liquid injector 18 is pulled out from the stopcock 26, and the moving operation of the piston 22 is performed, as shown in FIG. 6 above. You have to create a perfect condition.

Therefore, it is necessary to repeat the operation of filling the water tank 10 with the conventional liquid injector 18 into the water tank 10 by inserting and withdrawing the injection port 24 of the cylinder into the stopcock 26 a plurality of times, which is a troublesome task. was there.

The purpose of the present invention is to solve the above-mentioned problems, and its purpose is to provide a sealed water tank for which the liquid filling work in the sealed water tank can be performed more quickly by a simple operation. To provide a liquid injector.

[Means for Solving the Problems] In order to achieve the above object, a liquid injector for a sealed water tank according to the present invention has a cylinder part having one end closed and an outlet at the closed end, and a cylinder part inserted into the cylinder part. A piston having a seal portion that seals between the inner surface of the cylinder portion and a tip portion of the cylinder portion, and the piston is pushed into the closed end portion of the cylinder portion to fill the cylinder portion from the emission port. In a liquid injector for a sealed water tank that emits a liquid that is provided, a vent passage that is further penetrated from a position from the tip to a tail end than the seal portion of the piston and a tail end side opening of the vent passage are provided. An opening / closing plug for arbitrarily opening and closing the opening is provided, and a shield plate is attached to the tip end surface of the piston.

[Operation] According to the liquid injector for the sealed water tank having the above-mentioned configuration, after the liquid filled in the cylinder portion is injected into the water tank by the push-in operation of the piston, the opening / closing plug is operated to open the ventilation passage, and the piston is pulled up as it is. be able to. That is, in the conventional liquid injector, it was necessary to remove the cylinder from the water tank side once to fill the cylinder with the liquid, but according to the present invention, the ventilation passage in the piston can be opened. The piston can be pulled up as it is, and the liquid can be filled in the cylinder through the ventilation passage.

Further, even when the liquid bubbles are almost filled in the water tank and the residual bubbles are removed, the opening plug is operated without pulling out the liquid injector, and the ventilation path is opened to move the piston upward as it is. It is possible,
It is possible to easily create a state in which a predetermined amount of water and an air portion above it are secured in the cylinder. As a result, it is possible to remove bubbles by good vacuum deaeration.

As described above, according to the present invention, a series of operations from filling water in the water tank to removing bubbles can be performed with the liquid injector attached to the water tank side.

Further, according to the present invention, it is possible to prevent water droplets scattered by the shielding plate from entering the ventilation path.

[Embodiment] A preferred embodiment of the liquid injector for a closed water tank according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of a liquid injector according to the present invention and a water tank
FIG. 11 is a schematic cross-sectional view showing the liquid injector 30 of the cylinder.
It is composed of 32 and a piston 34.

At the tip of the cylinder 32, a discharge port 36 for discharging the liquid filled in the cylinder is formed.

At the position near the tip of the insertion side of the piston 34, the piston 34
A seal portion 38 is provided to seal between the inner surface of the cylinder 32 and the inner surface of the cylinder 32. Also, from the tail end of the piston 34 to the seal
Between the position 38 and the position closer to the tip, the piston 34
An air passage 40 that penetrates the inside is formed. An opening / closing plug 42 is attached to the tail end side opening of the ventilation path 40. The opening / closing plug 42 is screwed into the opening of the ventilation path 40 and can be easily attached / detached by manual operation.

A shield plate 44 is attached to the tip end surface of the piston 34 on the insertion side, and water droplets scattered from the tip end side opening portion 50 of the ventilation path 40 when the vacuum degassing is performed with the opening / closing plug 42 removed from below. Prevents invasion by suction.

The liquid injector 30 of this embodiment has the above-mentioned configuration,
The operation will be described below.

First, when pouring water, the opening / closing plug 42 is attached to close the ventilation path 40, and the liquid filled in the cylinder 32 is poured into the water tank 10 from the outlet 36 by the descending operation of the piston. When the water tank 10 is not sufficiently filled with one injection operation, the opening / closing plug 42 is removed, and the ventilation passage 40
Open, pull up the piston 34, and
Liquid is injected and filled into the cylinder 32 via 40. Then, the opening / closing plug 42 is attached, and the piston 34 is pushed in again to perform the liquid filling operation. Next, after the water tank 10 is almost filled with the liquid, the remaining air bubbles 46 are vacuum-degassed. In this case, as shown in FIG. The air section 48 is secured in the
This state can be easily created by removing 42 and moving the piston 34. Then, the opening / closing plug 42 is attached again to close the air passage 40, and the piston 34 is pulled upward (in the direction of arrow 100) to reduce the pressure in the air portion 48 and the air passage 40, and the residual bubbles 46 in the water tank 10 expand. At the same time, it escapes from the emission port 36 and enters the air portion 48 of the cylinder 32.

As described above, according to the liquid injector of the embodiment, it is possible to easily fill the water tank 10 with the liquid and remove the bubbles after the filling while the emission port 36 is attached to the water tank 10.

During the residual bubble removing operation, the vacuum deaeration was performed by pulling up the piston 34. However, as shown in FIG. 2, the liquid injector 30 and the water tank 10 are arranged in the processing case 12, and the processing case 12 It is also possible to automatically raise the piston 34 by depressurizing the inside of the water tank 10 to extract the residual bubbles.

During the operation of extracting the residual air bubbles by the vacuum deaeration, the air bubbles 46 enter the cylinder 32 from the emission port 36, and
Although water droplets may be scattered when it comes out to 48, in the present embodiment, since the shielding plate 44 is provided, these water droplets do not enter from the tip end side opening portion 50 of the ventilation path. Therefore, it is possible to prevent the situation that the water that has entered the ventilation passage 40 when the piston 34 is pulled out spills and wets other parts of the device.

[Effects of the Invention] As described above, according to the liquid injector for a sealed water tank according to the present invention, the liquid injector is attached to the water tank side by appropriately opening and closing the ventilation passage that penetrates through the piston with the opening and closing plug. In this state, it is possible to fill the water tank with the liquid and remove the remaining air bubbles. This makes it possible to efficiently and easily carry out the liquid filling work into the water tank.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a state in which a liquid injector according to an embodiment is attached to a water tank, FIG. 2 is a schematic sectional view showing another usage of the embodiment, and FIGS. 3 and 4 are conventional. FIGS. 5 and 6 are schematic cross-sectional views showing the structure and operation of a conventional liquid injector, for explaining the liquid filling operation into the water tank. 10 …… Ultrasonic transducer water tank 32 …… Cylinder 34 …… Piston 40 …… Ventilation path 42 …… Opening / closing plug 44 …… Shielding plate

Continuation of front page (56) Reference JP-A-57-136443 (JP, A) JP-A-62-274257 (JP, A) JP-A-53-115590 (JP, A)

Claims (1)

(57) [Scope of utility model registration request] 1. A cylinder part having one end closed and having an emission port at the closed end, and a piston having a seal part which can be inserted into the cylinder part and seals between the inner surface of the cylinder part near the tip. Then, in the liquid injector for a sealed water tank which ejects the liquid filled in the cylinder portion from the outlet by pushing the piston toward the closed end side of the cylinder portion, the tip is further tip than the seal portion of the piston. A ventilation passage penetrating from the twisted position to the tail end; and an opening / closing plug that is provided at the tail end side opening of the ventilation passage and that opens and closes the opening arbitrarily; A liquid injector for a sealed water tank, wherein a shield plate having a length smaller than the inner diameter of the portion is attached so as to be substantially orthogonal to the axial direction of the piston.