JPH0130688B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a reduced pressure generator, in particular a large syringe type, which is ergonomically easy to operate and can achieve maximum exhaust volume with one hand operation. The present invention relates to a generating device and a device for generating and maintaining negative pressure in a closed object in combination with this device.

(Prior Art) Conventionally, syringe-type depressurization generators using a cylinder and a piston moving inside the cylinder are operated with one hand, and the cylinder and piston are operated between the fingers to achieve a small volume of evacuation. BACKGROUND OF THE INVENTION Large capacity vacuum generators are known in which the cylinder is operated with one hand and the piston is operated with the other hand.

(Problem to be solved by the invention) The exhaust capacity of a syringe-type reduced pressure generator is determined by the cylinder inner diameter and piston stroke.
Therefore, in order to increase the exhaust capacity, the cylinder inner diameter and piston stroke must be increased. However, the size of the cylinder that can be held by hand is limited, and conventional syringe-type large capacity vacuum generators operate with a long piston stroke.
Since the cylinder is gripped with one hand and the piston stroke is operated with the other hand, it is difficult to maintain a closed object consisting of a container that maintains negative pressure and a lid. Furthermore, to facilitate monitoring of the container, piston operation must be initiated relatively high on the body, which is not ergonomically comfortable.

The inventor of the present invention discovered that by fixing the piston stroke of the decompression generator and moving the cylinder up and down, it is possible to generate a large volume of decompression ergonomically with one hand, while the other hand can be operated easily. The present invention was completed by discovering that it is now possible to hold a sealed object consisting of a container and a lid, and to position the container in a position where it can be easily monitored.

Therefore, the main object of the present invention is to provide a large-capacity reduced pressure generator that is portable, simple, and easy to operate with one hand and is operated manually without using power.

Furthermore, another object of the present invention is to provide a device for generating and maintaining negative pressure in a sealed object that is combined with the reduced pressure generating device, and a device for generating and maintaining negative pressure in a sealed object that is equipped with a device that allows the degree of negative pressure to be easily observed. It is on offer.

(Means for Solving the Problems) In order to achieve the above object, a reduced pressure generating device according to the present invention is a reduced pressure generating device using a tube body and a piston moving inside the tube body, and the device can be grasped with one hand. a tubular body, a tubular rod extending sealingly through an end wall of the tubular body into and out of the tubular body, having an open free end outside the tube and a closed end inside the tube, and a rod closed end; a radial suction orifice of a tubular rod located near the lower surface of the piston and opening into the tube;
It consists of a lid covering the upper part of the tube and having an air outlet hole, and is characterized in that the suction orifice is opened into the tube even when the piston contacts the end wall of the tube.

The radial orifice of the rod is always located within the tube chamber and the free end of the rod is always located outside the end wall.

The piston contacts the tube body at its upper surface through an outer circumferential skirt portion extending toward the lid body.

Furthermore, the device for generating and maintaining negative pressure in a sealed object according to the present invention is a combination of the reduced pressure generating device and a sealed object, and the sealed object is airtight with the free end of the rod opening of the reduced pressure generating device. It is characterized by providing a fittable joint and a check valve part communicating with the joint.

The closure comprises a vertical tube including a non-return valve part connected to the top wall and a joint connecting this valve part to a reduced pressure generator, said joint being fully screwed into the threaded cap. A cap is provided that is hermetically pressed against the joint portion.

As a simple negative pressure observation device, the sealed object is equipped with a vertical short tube on the upper wall that communicates with the inside of the sealed object, and a deformable elastic membrane is placed over the upper opening of this short tube, and this elastic membrane has a large The elastic membrane has a substantially hemispherical shape under atmospheric pressure and is fixed to the outer periphery of the upper flange of the vertical short tube, and the elastic membrane contracts into a flat shape within the short tube under reduced pressure.

Further, the enclosure includes an elastic balloon that expands to a predetermined size under a predetermined reduced pressure, and the balloon contracts flat under atmospheric pressure to contain a predetermined amount of gas.

(Function) For example, in order to generate a negative pressure in a closed object consisting of a transparent container 71 and a lid 72 placed on a table, the rod 54 is pulled out from the tube body 51 by hand as much as possible. The end wall 55 and the piston end plate 66 are in contact with each other, but the orifice 69 is in contact with the tube body 51.
Located within. Grasping the tube 51 with one hand and holding the container 71 with the other hand, the free end 67 of the rod 54 is hermetically fitted into the joint 79 of the passage 76 of the anti-reflux valve portion of the container 71, and then the tube is removed. 51 with one hand, and then lower the upper end 64 of the piston to the lid 5.
2 into contact with the insertion portion 60 of No. 2. During this time, the air in the container 71 passes through the passage 76, the non-return valve body 78, the passage joint 79, the rod shaft passage 68, and the orifice 69, and is expanded into the lower chamber 70 of the tube body 51, and is reduced in pressure. During the lowering of the tube 51, the air in the upper chamber of the tube 51 is exhausted via the outlet 61. When one hand loosens the grip on the tube body 51, the piston is pushed down by the atmospheric pressure acting on the upper end plate 64 of the piston and returns to the next pressure reduction operation position, and the pressure reduction operation is repeated until the desired pressure reduction is achieved. . When the vacuum generator is tilted to move the free end 67 of the rod away from the junction 79, the non-return valve 78 is actuated to maintain the container 71 at negative pressure. The degree of pressure reduction can be easily determined by observing the state of the elastic membrane 82 or the elastic balloon, and the pressure reduction operation can be performed ergonomically and comfortably in front of the operator while observing the degree of pressure reduction in the container.

(Example) The features and advantages of the present invention will be explained below with reference to the accompanying drawings.

The reduced pressure generator shown in Figures 1 and 2 is 3
The piston 53 is connected to a tube body 51, a lid body 52, and a rod 54.

The tube 51 is cylindrical and has an axis that is assumed to be vertical for convenience of description. Its lower end is formed by an end wall 55 with a central orifice 56. The center orifice 56 is provided with an annular groove,
A sealing O-ring 57 is placed in this. The upper end of the tube body 51 is open.

The lid 52 consists of a geometric disk 58 whose diameter is larger than the outer diameter of the tube 51 and whose lower surface coaxially abuts the upper edge of the tube 51 . The lid body 52 extends downward from the disk 58 and is connected to the tube body 51.
It is held in place by a cylindrical center portion 59 that fits over the top end of the cylindrical center portion. A central insertion portion 60 projects downward from this central portion 59. The lid body 52 is provided with two exit holes 61 that are diametrically opposed to each other. Each of them is formed into a cylindrical hole by a recess 62 formed on the lower side of the disk 58, and the recess 62 is formed by boring a part of the vertical wall of the center part 59 and connecting with the upper inner wall of the tube body 51. A groove 63 serving as a passage is included in between, and thus each outlet hole 61 has an L-shaped axial cross section (FIG. 1) and a circular planar cross section (FIG. 2), so that the lid body 52 is centered. Even when the tube body 51 is fitted into the tube body 51 by the portion 59, the inside of the tube body is communicated with the outside through the outlet hole 61 and the lower surface of the lid body 52.

The piston 53 has a solid end 64 with a flexible skirt 65 extending therearound which extends upwardly to slide over the inner surface of the cylindrical wall of the tube 51. The height of the skirt portion 65 is the height of the insertion portion 6.
It is greater than the height of 0. The end 64 of the piston is secured to a circular end plate 66 at the upper closed end of the tubular rod 54. The rod 54 is connected to the end wall 55 of the tube body 51.
extends through the central orifice 56 and has a hemispherical open free end 67 that is always located at the distal end of the tube 51, regardless of the position of the piston 53 in the tube 51. It is located outside the tube below the wall portion 55. To improve the grip of the tube 51, a recess can be provided around the tube 51 and/or a thumb recess can be provided in the top of the lid 52.

FIG. 3 shows a container 71 for storing articles, such as food products, under reduced pressure, preferably constructed of a transparent material. An airtight screw lid 72 is attached to the container 71 to form a closed body, and the lid 72 has a central hole 73 into which a lower portion 74 of a check valve 75 is fixed.
This check valve part 75 consists of a lower part 74 and an upper part 77 that engage, and forms a cavity in the center that accommodates a plate-shaped valve body 78.The lower surface of this cavity is flat and tightly contacts the valve body 78 when maintaining reduced pressure. However, the top surface is flat but has grooves, and these grooves serve as passages for air in the container during depressurization operations. The cavity communicates with the inside and outside of the container by a central passageway 76 passing through a lower part 74 and an upper part 77;
A hemispherical recessed joint 79 is formed on the upper surface of the upper portion 77 of the passage 76, which can be tightly fitted with the hemispherical free end 67 of the rod 54 of the vacuum generator.

Furthermore, the lid 72 is provided with a short vertical tube 80 having a flange 81. An elastic membrane 82 having a substantially hemispherical shape covers the short tube 80 , and its outer periphery forms a flange 81 .
will be installed on the Furthermore, a very flexible small elastic balloon 83 is present in the container 71. This balloon has a flat shape under atmospheric pressure, but contains a small amount of air so that it expands under a predetermined reduced pressure.

In FIG. 4, a container 71 held under reduced pressure
is shown, the elastic membrane 82 is contracted into the short tube 80,
Balloon 83 is inflated. Further, a cap 84 is provided on the upper part 77 of the check valve part, and a sealing material 85 is attached in contact with the joint part 79.

(Effects of the Invention) According to the reduced pressure generating device of the present invention, by repeatedly moving the tube up and down with one hand, a large amount of reduced pressure can be easily generated, and reduced pressure can be easily obtained without using power. Furthermore, a convenient negative pressure maintenance container using this is also provided, and can be conveniently used for home use, camp life, etc., for example, for storing food.

[Brief explanation of drawings]

FIG. 1 is an axial cross-sectional view of the reduced pressure generation device according to the present invention, FIG. 2 is a cross-sectional view taken along the line 2-2 in FIG. 1, and FIG. 3 is a negative pressure generation and FIG. 4 is an axial sectional view showing the state of the maintenance device before depressurization, and FIG. 4 is an axial sectional view showing the state when the depressurization is maintained. 51... tube body, 52... lid body, 53... piston, 54... piston rod, 55... end wall, 56... orifice, 57... O-ring,
58...Disc, 59...Cylindrical center, 60...
... central insertion part, 61 ... exit hole, 62 ... recess, 63 ... groove, 64 ... end, 65 ... skirt part, 66 ... circular end, 67 ... free end,
68... shaft passage, 69... orifice, 70...
chamber, 71...container, 72...lid, 73...
Hole portion, 74...Lower portion, 75...Return prevention valve portion, 7
6... Passage, 77... Upper part, 78... Valve body, 79
...joint part, 80 ... short pipe, 81 ... flange,
82...Elastic membrane, 83...Balloon, 84...Cap, 85...Sealing material.

Claims (1)

[Claims] 1. A reduced pressure generating device using a tube and a piston moving inside the tube, which includes a tube that can be grasped with one hand and a device that sealingly penetrates the end wall of the tube. A tubular rod extending inward and outward, having an open free end outside the tube and a closed end inside the tube, a piston attached to the closed end of the rod and slidable within the tube, and a tube located near the bottom surface of the piston. It consists of a radial suction orifice of the tubular rod that opens into the body, and a lid that covers the top of the tube and has an air outlet hole, so that the suction orifice opens into the tube even when the piston contacts the end wall of the tube. A reduced pressure generator characterized by: 2. The reduced pressure generator of claim 1, wherein the radial suction orifice is always located within the tubular chamber and the free end is always located outside the end wall. 3. The reduced pressure generating device according to claim 1, wherein the piston contacts the pipe body through an outer circumferential skirt portion extending in the direction of the lid body on the upper surface portion of the piston. 4. A tubular body that can be grasped with one hand, and a tubular rod that sealingly penetrates the end wall of the tubular body and extends inward and outward, having an open free end outside the tube and a closed end inside the tube. , having a piston slidable within a tube attached to the closed end of the rod, a suction orifice in the radial direction of the tubular rod located near the lower surface of the piston and opening into the tube, and an air outlet hole covering the upper portion of the tube. a lid, the suction orifice is opened into the tube body even when the piston contacts the end wall of the tube body; and a sealing member fitted to the vacuum generating device. a device for generating and maintaining a negative pressure, the sealing device having a joint that can be hermetically fitted to the open free end of the tubular rod of the reduced pressure generator, and a non-return valve communicating with the joint. A device for generating and maintaining negative pressure in a sealed object. 5. The closure comprises a vertical tube including a non-return valve part connected to its upper wall and a joint connecting this valve part to a reduced pressure generator, the joint being connected to the hemisphere of the open free end of said tubular rod. Claim 4: The device is formed into a hemispherical concave surface that airtightly fits with the surface, and is configured such that the airtight fit can be released by tilting the reduced pressure generator.
Negative pressure generation and maintenance device for closed objects as described in Section 1. 6. The seal according to claim 4, wherein the seal has a vertical short pipe on its upper wall that communicates with the inside of the seal, and a deformable elastic membrane is covered at the upper opening of the short pipe. Negative pressure generation and maintenance device for objects. 7. The device for generating and maintaining negative pressure in a closed object according to claim 6, wherein the elastic membrane has a substantially hemispherical shape at atmospheric pressure and is fixed to the outer periphery of the upper flange of the short vertical tube. 8. The device for generating and maintaining negative pressure in a closed object according to claim 6, wherein the elastic membrane contracts into a flat shape inside the short tube under reduced pressure. 9. The negative pressure generation and maintenance device for a sealed object according to claim 4, wherein the sealed object includes an elastic balloon that expands to a predetermined size under a predetermined reduced pressure. 10. The device for generating and maintaining negative pressure in a sealed object according to claim 9, wherein the balloon deflates flat under atmospheric pressure and contains various amounts of air.