Suction filtration system capable of preventing suck-back

Abstract

The utility model discloses a suction filtration system capable of preventing suck-back, which comprises a Buchner funnel (1), a connecting hose (2) and a suction flask (8), the Buchner funnel (1) is inserted into the upper end of the suction flask (8), the suction filtration system further comprises a communicating device box (4), a suction filtration nozzle of the suction flask (8) is connected with an air inlet (5) of the communicating device box (4) through the connecting hose (2), and the connecting hose (2) is connected with the air inlet (5) of the communicating device box (4). An air outlet (7) of the communicating device box (4) is connected with a vacuum pump (7) through another connecting hose (2); and the communication device box (4) comprises a one-way conduction airflow valve (3). According to the utility model, the semi-fixed buckle is additionally arranged on the communicating device box, so that when the suck-back phenomenon of the vacuum pump occurs, once the pressure generated by liquid (water or oil) in the vacuum pump as liquid flowing reversely exceeds the set pressure of the communicating device box, the semi-fixed buckle can be directly disintegrated; and the filtered and collected feed liquid in the suction flask can be protected from being polluted by liquid (water or oil) in the vacuum pump.

Description

Technical Field

[0001] The utility model relates to the field of solid-liquid separation and filtration of substances, and more specifically, to a device which can effectively prevent the occurrence of vacuum pump liquid back-sucking phenomenon caused by accidents or mistakes during operation and is specially suitable for laboratory use. Background Art

[0002] The filtration system consisting of a Buchner funnel, a filtration bottle and a vacuum pump is a common solid-liquid separation filtration system in the laboratory. However, in actual operation, students often make operating errors, that is, they directly turn off the vacuum pump switch without disconnecting the connecting hose first; or the vacuum pump stops and loses pressure due to power outages or mechanical failures. These will cause the liquid (water or oil) in the vacuum pump to be directly sucked back into the filtration bottle, contaminating the filtered liquid in the filtration bottle.

[0003] Currently, there is no filtration system specifically suitable for laboratory use and capable of preventing backflow in the market or in patent literature, and it is urgent to develop a new practical device to solve this problem. Utility Model Content

[0004] The utility model aims to provide a laboratory filtration system capable of preventing back suction, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A suction filtration system capable of preventing back suction comprises a Büchner funnel (1), a connecting hose (2) and a suction filtration bottle (8), wherein the Büchner funnel (1) is plugged into the upper end of the suction filtration bottle (8), and further comprises a connecting device box (4), wherein the suction filtration nozzle of the suction filtration bottle (8) is connected to an air inlet (5) of the connecting device box (4) via a connecting hose (2), and an air outlet (7) of the connecting device box (4) is connected to a vacuum pump (7) via another connecting hose (2); the connecting device box (4) comprises a one-way flow valve (3).

[0007] As a further solution of the utility model: the connecting device box (4) comprises a main body (4-1) and an upper cover (4-2), and the upper surface of the main body (4-1) is provided with a groove of the Tesla valve pipeline structure; the upper cover (4-2) seals and covers the groove, thereby forming a complete Tesla valve pipeline structure, namely the one-way conductive air flow valve (3).

[0008] As a further solution of the utility model: the main body (4-1) and the upper cover (4-2) are fixed by a semi-fixed buckle (6).

[0009] As a further solution of the utility model: the fixation of the semi-fixed buckle (6) is capable of being disconnected when exceeding a predetermined value.

[0010] As a further solution of the utility model, the predetermined value is the minimum pressure at which the liquid of the vacuum pump (9) sucked back into the one-way flow valve (3) will not reach the air inlet (5) in the reverse direction.

[0011] As a further solution of the utility model: a direction mark (12) is provided on the communication device box (4), and the direction mark (12) points from the air inlet (5) to the air outlet (7).

[0012] As a further solution of the utility model: the direction mark (12) is arranged on the front and / or back of the communication device box (4).

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model provides a laboratory filtration system that can prevent back suction, the core of which is a connecting device box equipped with a one-way flow valve. The utility model is suitable for laboratories and can solve the common vacuum pump back suction phenomenon in laboratory filtration systems.

[0015] 2. The utility model provides a laboratory suction filtration system that can prevent backflow. Different from the Tesla valve that is simply used as a fluid control element, the utility model is divided into a body (4-1) and an upper cover (4-2). A semi-fixed buckle is also installed. When the forward-flowing gas passes smoothly through the one-way flow valve, the semi-fixed buckle is in a fixed state. When the vacuum pump backflow phenomenon occurs, the liquid (water or oil) in the vacuum pump is sucked back from the gas outlet to the one-way flow valve in the connecting device box as the reverse-flowing liquid. Each time it passes through a channel of the one-way flow valve, it enters a wing-shaped obstacle, generating a reflux that hinders the overall forward flow of the liquid. As the number of wing-shaped obstacles increases, the resistance to the liquid advancing forward increases, and the pressure on the connecting device box increases. Once the pressure set by the connecting device box is exceeded, the semi-fixed buckle will directly disintegrate, which can protect the filtered and collected liquid in the suction filtration bottle from being contaminated by the liquid (water or oil) in the vacuum pump.

[0016] 3. The utility model provides a laboratory filtration system that can prevent back suction. The whole system has a simple and reliable structure. The operator only needs to connect the connecting device box with the filtration bottle and the vacuum pump according to the direction markings. It is easy to use, the filtration system is low in price, and it is very easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 The schematic diagram of the structure of a laboratory filtration system capable of preventing back suction is shown in FIG.

[0019] Figure 2 It is a schematic diagram of the top structure of the connecting device box.

[0020] Figure 3 Schematic diagram of the gas suction connecting device box of the filter bottle.

[0021] Figure 4 Schematic diagram of vacuum pump liquid back-intake into the connecting device box.

[0022] In the figure, 1. Buchner funnel; 2. connecting hose; 3. one-way flow valve; 4. connecting device box; 4-1 main body; 4-2 upper cover; 5. air inlet; 6. semi-fixed buckle; 7. air outlet; 8. filter bottle; 9. vacuum pump; 10. vacuum pump switch; 11. vacuum pump brake pulley; 12. direction mark. DETAILED DESCRIPTION

[0023] The following embodiments will be combined with the accompanying drawings to describe the present invention in detail. In practical applications, the shape, thickness or height of each component can be enlarged or reduced. The embodiments listed in the present invention are only used to illustrate the present invention and are not used to limit the scope of the present invention. Any obvious modifications or changes made to the present invention do not deviate from the spirit and scope of the present invention.

[0024] Example 1

[0025] See also Figure 1 and Figure 2 A suction filtration system capable of preventing back suction comprises a Buchner funnel 1, a connecting hose 2, a connecting device box 4, a suction filtration bottle 8, and a vacuum pump 9. The Buchner funnel 1 is plugged into the upper end of the suction filtration bottle 8, the suction nozzle of the suction filtration bottle 8 is connected to the air inlet 5 of the connecting device box 4 through a connecting hose 2, and the air outlet 7 of the connecting device box 4 is connected to the vacuum pump 9 through another connecting hose 2. The vacuum pump 9 has a vacuum pump switch 10 and a vacuum pump brake pulley 11.

[0026] The connecting device box 4 includes a body 4-1 and an upper cover 4-2. The body 4-1 is preferably made of plastic, and a groove of the Tesla valve pipeline structure is machined on the upper surface. The upper cover 4-2 is preferably made of a transparent acrylic plate. The upper cover 4-2 can seal and cover the groove. The body 4-1 and the upper cover 4-2 are fastened with a semi-fixed buckle 6 to form a complete Tesla valve pipeline structure, i.e., a one-way flow valve 3. One end of the Tesla valve pipeline structure is connected to the air inlet 5, and the other end is connected to the air outlet 7.

[0027] The semi-fixed buckle 6 can be a rubber band, a belt, etc. The connecting device box 4 can be multi-channel. In this embodiment, the left and right halves of the connecting device box 4 are respectively provided with a semi-fixed buckle 6.

[0028] A direction mark 12 is applied on the front side of the body 4-1.

[0029] In another embodiment, direction marks 12 are applied on both the front and back sides of the body 4 - 1 .

[0030] See also Figure 1 and Figure 3 When the vacuum pump 9 is started, the gas in the filtration bottle 8 enters the one-way flow valve 3 in the connecting device box 4 from the air inlet 5, and then flows out from the air outlet 7. These forward-flowing gases can bypass all wing-shaped obstacles in the one-way flow valve 3, and then flow unimpeded from the air inlet 5 to the air outlet 7, and obtain an acceleration effect due to the flow pressure.

[0031] See also Figure 1 and Figure 4 When the vacuum pump 9 stops due to power failure or mechanical failure, or due to the operator's mistake, the vacuum pump switch 10 is directly turned off without disconnecting the connecting hose 2, causing the liquid (water or oil) in the vacuum pump 9 to be directly sucked back from the air outlet 7 to the one-way flow valve 3 in the connecting device box 4. Each time these reverse-flowing fluids pass through a channel of the one-way flow valve), they enter a wing-shaped obstacle, resulting in a reflux that hinders the overall forward flow of the fluid. The more wing-shaped obstacles there are, the greater the resistance to the fluid's forward propulsion, and the greater the pressure on the connecting device box 4. Once the pressure set by the connecting device box 4 is exceeded, the semi-fixed buckle 6 directly disintegrates, and although the liquid (water or oil) in the vacuum pump 9 will spill out, it will not be sucked back into the suction bottle 8, thereby protecting the filtered and collected liquid in the suction bottle from being contaminated by the liquid (water or oil) in the vacuum pump 9.

[0032] The collapse pressure of the connecting device box 4 should be set to ensure that the vacuum pump 9 liquid (water or oil) sucked back into the one-way flow valve 3 will not reach the minimum pressure of the air inlet 5.

[0033] See also Figure 2 The direction mark 12 of the connecting device box 4 is from the air inlet 5 to the air outlet 7.

[0034] The use of the utility model is as follows:

[0035] Before the filtration begins, put filter paper in the Buchner funnel 1, add a small amount of deionized water to moisten it, and place the Buchner funnel 1 on the filtration bottle 8; according to the direction mark 12, use the connecting hose 2 to connect the filtration port of the filtration bottle with the air inlet 5 of the connecting device box 4, and then use the connecting hose 2 to connect the air outlet 7 of the connecting device box 4 with the air intake of the vacuum pump 9; start the vacuum pump switch 10, pour the solid-liquid mixture into the Buchner funnel 1, and start the filtration. At this time, the gas in the filtration bottle 8 enters the one-way flow valve 3 in the connecting device box 4 from the air inlet 5, and then flows out from the air outlet 7 and is sucked into the vacuum pump 9.

[0036] When the filtration is finished, if the operator makes a mistake and directly turns off the vacuum pump switch 10 without disconnecting the connecting hose 2, the liquid (water or oil) in the vacuum pump 9 will be sucked back from the air outlet 7 to the one-way flow valve 3 in the connecting device box 4. Each time these reverse-flowing fluids pass through a channel of the one-way flow valve 3, they enter a wing-shaped obstacle, causing a reflux that hinders the overall forward flow of the fluid. The more wing-shaped obstacles there are, the greater the resistance to the fluid's forward propulsion, and the greater the pressure on the connecting device box 4. Once the collapse pressure set by the connecting device box 4 is exceeded, the semi-fixed buckle 6 collapses directly, and although the liquid (water or oil) in the vacuum pump 9 will spill out, it will not be sucked back into the filtration bottle 8, thereby protecting the filtered and collected liquid in the filtration bottle from being contaminated by the liquid (water or oil) in the vacuum pump 9.

[0037] or

[0038] During the filtration process, the vacuum pump 9 stops and loses pressure due to power failure or mechanical failure. At this time, the liquid (water or oil) in the vacuum pump 9 will also be sucked back from the air outlet 7 to the one-way flow valve 3 in the connecting device box 4. Each time these reverse-flowing fluids pass through a channel of the one-way flow valve 3, they enter a wing-shaped obstacle, causing a reflux that hinders the overall forward flow of the fluid. As the number of wing-shaped obstacles increases, the resistance to the forward propulsion of the fluid increases, and the pressure on the connecting device box 4 increases. Once the collapse pressure set by the connecting device box 4 is exceeded, the semi-fixed buckle 6 collapses directly, and although the liquid (water or oil) in the vacuum pump 9 will spill out, it will not be sucked back into the filtration bottle 8, thereby protecting the filtered and collected liquid in the filtration bottle from being contaminated by the liquid (water or oil) in the vacuum pump 9.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A suction filtration system capable of preventing back suction, comprising a Buchner funnel (1), a connecting hose (2) and a suction filtration bottle (8), wherein the Buchner funnel (1) is plugged into the upper end of the suction filtration bottle (8), and characterized in that: It also comprises a connecting device box (4), wherein the filter nozzle of the filter bottle (8) is connected to the air inlet (5) of the connecting device box (4) via a connecting hose (2), and the air outlet (7) of the connecting device box (4) is connected to the vacuum pump (9) via another connecting hose (2); the connecting device box (4) comprises a one-way conducting air flow valve (3).

2. A suction filtration system capable of preventing back suction according to claim 1, characterized in that: The connecting device box (4) comprises a body (4-1) and an upper cover (4-2), wherein the upper surface of the body (4-1) is provided with a groove of a Tesla valve pipeline structure; the upper cover (4-2) seals and covers the groove, thereby forming a complete Tesla valve pipeline structure, namely the one-way flow valve (3).

3. A suction filtration system capable of preventing back suction according to claim 2, characterized in that: The body (4-1) and the upper cover (4-2) are fixed by a semi-fixed buckle (6).

4. A suction filtration system capable of preventing back suction according to claim 3, characterized in that: The fixation of the semi-fixed buckle (6) can be disconnected when exceeding a predetermined value.

5. A suction filtration system capable of preventing backflow according to claim 4, characterized in that: The predetermined value is the minimum pressure at which the liquid of the vacuum pump (9) sucked back into the one-way flow valve (3) will not reach the air inlet (5) in the reverse direction.

6. A suction filtration system capable of preventing back suction according to any one of claims 1 to 5, characterized in that: The communication device box (4) is provided with a direction mark (12), and the direction mark (12) points from the air inlet (5) to the air outlet (7).

7. A suction filtration system capable of preventing back suction according to claim 6, characterized in that: The direction mark (12) is arranged on the front and / or back of the communication device box (4).

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