Suck-back prevention suction filtration device

Abstract

The utility model discloses an anti-suck-back suction filtration device which comprises a funnel, the bottom of the funnel is reduced to form a drainage tube, and a filter plate is further arranged at the inner bottom of the funnel; an outer tube and a connecting tube are sequentially sleeved in the drainage tube from top to bottom, the upper end of the outer tube is hermetically connected with the outer wall of the reducing part at the bottom of the funnel, and the lower end of the outer tube is hermetically connected with the connecting tube; a cavity is formed between the inner wall of the outer tube and the outer wall of the drainage tube, a partition plate is obliquely arranged in the cavity, and the cavity is divided into an upper liquid sucking-back cavity and a lower air exhaust cavity by the partition plate; a communicating hole is further formed in the upper end of the partition plate, the liquid sucking-back cavity and the air suction cavity are communicated through the communicating hole, and an air suction pipe communicated with the liquid sucking-back cavity is further arranged on the outer pipe. The connecting pipe, the air exhaust cavity, the communicating hole, the liquid sucking-back cavity and the air exhaust pipe are sequentially communicated to form a closed air exhaust channel. The anti-suck-back filter has an anti-suck-back function, can prevent filtrate from being polluted when the suck-back phenomenon occurs in the suction filtration process, and can ensure smooth filtration and the suction filtration effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reduced pressure filtration device technical field, specifically is a kind of anti-suck back filtration device. BACKGROUND

[0002] Reduced pressure filtration, also known as reduced pressure filtration, filtration or suction filtration, is a kind of filtration technology, widely used in food, medicine, chemical industry and other industries, its principle is to use the negative pressure generated by vacuum pump, the air in filter bottle is extracted, the pressure in filter bottle is reduced, so that a pressure difference is formed between the inner wall of suction filtration funnel and filter bottle, this pressure difference can accelerate the filtration speed, liquid is extracted into filter bottle under the action of negative pressure, while solid is left on filter paper in suction filtration funnel, so as to achieve the purpose of solid-liquid separation.

[0003] The current reduced pressure filtration device mainly includes suction filtration funnel, filter bottle, vacuum pump and rubber pipe and other components. Among them, suction filtration funnel is a kind of experimental apparatus specially used for liquid and solid separation, usually composed of funnel body, filter paper supporting device and air suction port connected with air suction system, when operating, the rubber pipe connected with air suction port and vacuum pump needs to be disconnected first, then the switch of vacuum pump is closed, if improper operation, equipment failure or sudden power failure occurs during the process, it will cause the filter bottle to maintain vacuum state, so that the liquid in vacuum pump is sucked into the filter bottle through the funnel body outer tube, thereby polluting the filtrate, affecting the experimental results and increasing the experimental cost.

[0004] Based on this, it is necessary to design a reduced pressure filtration device to prevent suck back. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of anti-suck back filtration device, the device has anti-suck back function, can avoid that filtrate is polluted when suck back phenomenon occurs in filtration process, can guarantee the smooth progress of filtration, and guarantee filtration effect.

[0006] The utility model aims mainly to realize following technical scheme: a kind of anti-suck back filtration device, including funnel, the diameter of the bottom of funnel is changed to form drainage tube, filter plate is further provided in the bottom of funnel;Outer tube and connecting pipe are successively sleeved in the drainage tube from top to bottom, the outer tube upper end is connected with the outer wall of the diameter change portion of the bottom of funnel and is closed, and the outer tube lower end is sealed with connecting pipe;Cavity is formed between the inner wall of outer tube and the outer wall of drainage tube, the cavity is inclinedly provided with baffle, the baffle separates the cavity into upper suck back liquid cavity and lower air suction chamber, the upper end of baffle is further provided with communication hole, the communication hole communicates the suck back liquid cavity and air suction chamber, and air suction pipe is further provided on the outer tube and communicates with the suck back liquid cavity;Connecting pipe, air suction chamber, communication hole, suck back liquid cavity and air suction pipe are sequentially communicated to form closed air suction channel.

[0007] Based on the above technical scheme, the air extraction pipe is arranged opposite to the communication hole, and the setting height of the air extraction pipe is lower than that of the communication hole.

[0008] Based on the above technical scheme, the length of the drainage tube is greater than the sum of the lengths of the outer tube and the connecting tube.

[0009] Based on the above technical scheme, the baffle is an elliptical structure, which is obliquely connected between the inner wall of the outer tube and the outer wall of the drainage tube, and the inner side of the baffle is sealingly connected with the outer wall of the drainage tube, and the outer side of the baffle is sealingly connected with the inner wall of the outer tube.

[0010] Based on the above technical scheme, the two long axes of the baffle satisfy: one of the two long axes is located at the variable-diameter position of the top of the drainage tube, and the other long axis is located at the bottom of the inner wall of the outer tube.

[0011] Based on the above technical scheme, the filter bottle is detachably connected with the connecting tube, and the connection part is sealed, and the drainage tube is at least partially inserted into the inside of the filter bottle.

[0012] Based on the above technical scheme, the outer wall diameter of the connecting tube is greater than the outer wall diameter of the outer tube, and at least the outer wall of the connecting tube is made of glass frosted material, the filter bottle is provided with a frosted opening structure, and the connecting tube is sealingly connected in the inside of the frosted opening structure.

[0013] Based on the above technical scheme, the drainage tube, the air extraction pipe, the outer tube and the connecting tube are all glass tubes.

[0014] Based on the above technical scheme, the filter bottle is detachably connected with the connecting tube, and the connection part is sealed, and the drainage tube is at least partially inserted into the inside of the filter bottle.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows:

[0016] The utility model discloses a whole structure setting, and the connecting pipe, suction cavity, communicating hole, reverse suction liquid cavity and suction pipe are communicated in proper order and form the closed suction passage, thereby can realize the air in filter bottle can be sucked away and realizes the decompression suction filtration when filtering, guarantees the fast filtration effect, and the cavity part between the outer tube inner wall and the drainage tube outer wall is divided into suction cavity and reverse suction liquid cavity through the baffle, can realize the separation of reverse suction liquid, set up the round hole on the baffle top, can guarantee the pressure of two cavities in the same state when suction filtration, makes the suction filtration process smoothly, guarantees the suction filtration effect, and the baffle is combined and is inclinedly embedded between the outer tube inner wall and the drainage tube outer wall, guarantees that the reverse suction liquid cavity has enough space to accommodate reverse suction liquid, avoids the liquid in vacuum pump to be directly sucked into the filtrate, can effectively avoid the reverse suction liquid to enter the filtrate and pollute the filtrate, and through the horizontal position of the suction pipe is set up below the horizontal position of baffle round hole, after the reverse suction phenomenon occurs, the filter bottle negative pressure disappears, under the same air pressure, the horizontal position of reverse suction liquid is flush with the suction pipe, avoids the reverse suction liquid to flow into the filter bottle through the round hole and pollutes the filtrate. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the principles of the present application. In the drawings:

[0018] Figure 1 It is the first structure schematic view of the anti-reverse suction filtration device of the embodiment;

[0019] Figure 2 It is the second structure schematic view of the anti-reverse suction filtration device of the embodiment;

[0020] The reference numerals in the drawings represent respectively:

[0021] 1-funnel;2-filter plate;3-drainage tube;4-reverse suction liquid cavity;5-suction tube;6-baffle;7-communicating hole;8-outer tube;9-suction cavity;10-connecting pipe;11-filter bottle;12-rubber hose;13-vacuum pump. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is combined with example and drawing, and the utility model is explained further in detail, and the illustrative embodiment and the explanation thereof of the utility model are only used to explain the utility model, and do not serve as the limitation of the utility model.

[0023] As Figure 1The utility model discloses a kind of anti-suck filter devices, including funnel 1, funnel 1 bottom diameter change forms drainage tube 3, the filter plate 2 is also provided in the bottom of funnel 1 inside;Drainage tube 3 is sequentially sleeved with outer tube 8 and connecting pipe 10 from top to bottom inside, the outer tube 8 upper end is closedly connected with the diameter change place outer wall of funnel 1 bottom, and the outer tube 8 lower end is sealedly connected with connecting pipe 10;The cavity between the outer wall of outer tube 8 and drainage tube 3 outer wall is formed, the cavity is inclinedly provided with baffle 6, and the cavity is isolated as upper anti-suck liquid chamber 4 and lower air extraction chamber 9 by baffle 6;Baffle 6 upper end is also provided with communication hole 7, and the communication hole 7 is communicated with anti-suck liquid chamber 4 and air extraction chamber 9, and outer tube 8 is also provided with air extraction tube 5 communicated with anti-suck liquid chamber 4;Connecting pipe 10, air extraction chamber 9, communication hole 7, anti-suck liquid chamber 4 and air extraction tube 5 are sequentially communicated to form closed air extraction channel.

[0024] Funnel 1 of the embodiment is used to hold solid-liquid mixture to be filtered, and the filter plate 2 is integrally formed with the funnel 1 or fixedly connected with the funnel 1, used to support filter paper, realize the separation of solid and liquid, and the top diameter change position of the drainage tube 3 forms an umbrella-shaped structure, and the whole drainage tube 3 is used to guide the filtrate; The diameter of the outer tube 8 is obviously larger than that of the drainage tube 3, but the length is smaller than that of the drainage tube 3, and the whole is used as a support structure to support the funnel 1; The baffle 6 is inclinedly embedded between the inner wall of the outer tube 8 and the outer wall of the drainage tube 3, and divides the cavity between the two into the anti-suck liquid chamber 4 and the air extraction chamber 9; The anti-suck liquid chamber 4 is used to buffer the anti-suck liquid entering from the air extraction tube 5, to realize the separation of the filtrate and the anti-suck liquid, avoid the anti-suck liquid from mixing into the filtrate when anti-sucking occurs, cause the contamination of the filtrate, and cause the failure of the experiment; The air extraction chamber 9 is communicated with the anti-suck liquid chamber 4 through the communication hole 7 on the baffle 6, to ensure the formation of negative pressure in the device during the filtration process, and achieve the purpose of rapid filtration; The air extraction tube 5 is integrally formed with the outer tube 8 or fixedly and sealingly connected with the outer tube 8, used to connect the external air extraction system, realize the connection with the vacuum pump; The connecting pipe 10 is sealingly connected to the opening position of the lower end of the outer tube 8, used for the sealing of the outer tube 8, and used to connect with the external filtrate receiving structure (such as the filter bottle in the following).

[0025] In use, first, the connecting pipe 10 is connected with an external filtrate receiving structure (such as a filter bottle described later), the connection position is sealed, then the suction pipe 5 is connected with an external suction system (such as a rubber hose 12 and a vacuum pump 13 described later), and the installation is completed; then the filter paper is placed on the filter plate 2 and is wetted with water, the external suction system is turned on to perform suction, at this time, the gas in the external filtrate receiving structure is sucked out through the suction passage described above, so that the filter paper is tightly attached to the filter plate 2, the to-be-filtered material is poured into the funnel 1, and the filtrate flows into the filter bottle 11 from the drainage pipe 3; after the suction filtration is completed, the external suction system is turned off, the connecting pipe 10 is removed, and the filtrate can be poured out from the external filtrate receiving structure; during the suction filtration, if the siphoning phenomenon occurs, the siphoned liquid will sequentially pass through the rubber hose 12, the suction pipe 5, and enter the siphoned liquid cavity 4, and will not directly flow into the filter bottle 11 to mix with the filtrate, at this time, the external suction system can be immediately removed, the connecting pipe 10 is separated from the external filtrate receiving structure, the siphoned liquid is poured out through the suction pipe 5, and then the filtrate is poured out from the filter bottle 11.

[0026] Based on this, the embodiment forms a closed suction passage based on the connecting pipe 10, the suction cavity 9, the communication hole 7, the siphoned liquid cavity 4, and the suction pipe 5 in sequence, can realize the suction filtration under reduced pressure by sucking the air in the external filtrate receiving structure during filtration to ensure the rapid filtration effect, and can realize the separation of the siphoned liquid by dividing the cavity between the inner wall of the outer pipe 8 and the outer wall of the drainage pipe 3 into the suction cavity 9 and the siphoned liquid cavity 4 through the partition plate 6; the communication hole 7 provided on the upper end of the partition plate 6 can ensure that the pressures of the two cavities are in the same state during the suction filtration, so that the suction filtration process proceeds smoothly and the suction filtration effect is ensured, and the combination of the inclined embedding of the partition plate 6 between the inner wall of the outer pipe 8 and the outer wall of the drainage pipe 3 ensures that the siphoned liquid cavity 4 has enough space to accommodate the siphoned liquid, avoids the liquid in the external suction system (such as the vacuum pump 13 described later) from being directly siphoned into the filtrate, effectively avoids the siphoned liquid from entering the filtrate to contaminate the filtrate, and improves the filtration rate and filtration effect of the device as a whole.

[0027] In specific implementation, the suction pipe 5 is oppositely arranged with the communication hole 7, and the setting height of the suction pipe 5 is lower than that of the communication hole 7. The suction pipe 5 is horizontally arranged as a whole, and by setting the horizontal position of the suction pipe 5 to be lower than the horizontal position of the round hole of the partition plate, after the siphoning phenomenon occurs, the negative pressure of the filter bottle disappears, and under the same air pressure, the horizontal position of the siphoned liquid is flush with the suction pipe 5, so that the siphoned liquid is prevented from flowing into the external filtrate receiving structure through the communication hole 7 to contaminate the filtrate.

[0028] In the embodiment, the length of the drainage tube 3 is greater than the sum of the lengths of the outer tube 8 and the connecting tube 10. When the external filtrate receiving structure is connected, the connecting tube 10 is connected and sealed, so as to ensure the collection of the external filtrate receiving structure and avoid the filtrate being sucked away when the suction is applied. In this embodiment, the length of the drainage tube 3 is relatively long, so that it can extend into the internal part of the external filtrate receiving structure and be away from the connecting tube 10, thereby avoiding the filtrate flowing out of the drainage tube 3 from being sucked away when the suction is applied. This can not only ensure the safety of the filtration, but also protect the smooth implementation of the whole filtration process.

[0029] In the embodiment, the partition plate 6 is in an oval structure and is obliquely connected between the inner wall of the outer tube 8 and the outer wall of the drainage tube 3. The inner side of the partition plate 6 is sealingly connected with the outer wall of the drainage tube 3, and the outer side of the partition plate 6 is sealingly connected with the inner wall of the outer tube 8. The main function of the partition plate 6 is to divide the cavity between the outer tube 8 and the drainage tube 3 into two independent chambers, and only the communication hole 7 is used to ensure the communication between the two chambers to form a suction passage. Thus, the upper siphon chamber 4 can be well isolated from the siphon liquid to avoid the siphon liquid mixing into the filtrate to contaminate the filtrate.

[0030] In the embodiment, the two long-axis vertices of the partition plate 6 satisfy: one vertex is located at the variable-diameter position of the top of the drainage tube 3, and the other vertex is located at the bottom of the inner wall of the outer tube 8. The partition plate 6 is thus designed to maximize the volume of the upper siphon chamber 4 and to ensure that the communication hole 7 is at the highest position to avoid siphon suction, thereby better protecting the filtrate.

[0031] In the embodiment, as shown in Figure 2 As an external filtrate receiving structure, the anti-siphon filtration device of the embodiment further comprises a filter bottle 11, which is detachably connected with the connecting tube 10 and is sealingly connected at the connection position. The drainage tube 3 at least partially extends into the internal part of the filter bottle 11.

[0032] As a specific embodiment, the outer wall diameter of the connecting tube 10 is greater than the outer wall diameter of the outer tube 8, and at least the outer wall of the connecting tube 10 is made of glass frosted material. The filter bottle 11 is provided with a frosted structure, and the connecting tube 10 is sealingly connected inside the frosted structure. In application, the outer wall diameter of the connecting tube 10 is greater than the outer wall diameter of the outer tube 8, which can well support the outer tube 8 and better seal the connection position of the outer tube 8. Meanwhile, it is convenient to sealingly insert the connecting tube 10 into the filter bottle 11. At least the outer wall of the connecting tube 10 is made of glass frosted material, which is combined with the frosted structure of the filter bottle 11. Thus, the connecting tube 10 can be quickly inserted into the filter bottle 11, and after the insertion, the glass frosted material and the frosted structure can achieve good sealing effect, so that the filter bottle 11 can stably suck.

[0033] In the specific implementation, the drainage tube 3, the air extraction tube 5, the outer tube 8 and the connecting tube 10 are all glass tubes. The glass tubes are not only chemically stable based on the characteristics of glass, but also transparent for observing the filtrate and the siphon back liquid, and convenient for manufacturing and reducing the overall cost of the device.

[0034] In the specific implementation, as shown in Figure 2 As an external air extraction system, the anti-siphon extraction filtration device of the embodiment further comprises a rubber hose 12 and a vacuum pump 13, and the air extraction tube 5, the rubber hose 12 and the vacuum pump 13 are sequentially communicated. The rubber hose 12 and the vacuum pump 13 constitute a complete external air extraction system, thereby realizing the extraction filtration effect.

[0035] The above specific implementation further specifically describes the purpose, technical scheme and beneficial effects of the present application, and it should be understood that the above description is only a specific implementation of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A backflow prevention and filtration device, comprising a funnel, wherein the bottom of the funnel is tapered to form a drainage pipe, and a filter plate is further provided at the bottom of the funnel; characterized in that: The drainage tube is fitted with an outer tube and a connecting tube from top to bottom. The upper end of the outer tube is sealed to the outer wall of the diameter change section at the bottom of the funnel, and the lower end of the outer tube is sealed to the connecting tube. A cavity is formed between the inner wall of the outer tube and the outer wall of the drainage tube. A partition is inclinedly arranged in the cavity, which separates the cavity into an upper liquid suction cavity and a lower air suction cavity. The upper end of the partition is also provided with a connecting hole, which connects the backflow chamber and the air extraction chamber. The outer tube is also provided with an air extraction pipe that communicates with the backflow chamber. The connecting pipe, the air extraction chamber, the connecting hole, the backflow chamber, and the air extraction pipe are connected in sequence to form a closed air extraction channel.

2. The anti-backflow filtration device according to claim 1, characterized in that, The suction pipe is positioned opposite to the connecting hole, and the height of the suction pipe is lower than the height of the connecting hole.

3. The anti-backflow filtration device according to claim 1, characterized in that, The length of the drainage tube is greater than the sum of the lengths of the outer tube and the connecting tube.

4. The anti-backflow filtration device according to claim 1, characterized in that, The partition is an elliptical structure, inclinedly connected between the inner wall of the outer tube and the outer wall of the drainage tube, and the inner side of the partition is sealed to the outer wall of the drainage tube, while the outer side of the partition is sealed to the inner wall of the outer tube.

5. The anti-backflow filtration device according to claim 4, characterized in that, The vertices on the two major axes of the partition satisfy the following conditions: one vertex is located at the diameter change position at the top of the drainage tube, and the remaining vertex is located at the bottom of the inner wall of the outer tube.

6. The anti-backflow filtration device according to claim 1, characterized in that, The anti-backflow filtration device also includes a filter bottle, which is detachably connected to the connecting pipe and the connection between the two is sealed, and the drainage pipe extends at least partially into the interior of the filter bottle.

7. The anti-backflow filtration device according to claim 6, characterized in that, The outer diameter of the connecting tube is larger than that of the outer tube, and the outer wall of the connecting tube is made of frosted glass. The filter bottle is provided with a ground joint structure, and the connecting tube is sealed to the inside of the ground joint structure.

8. The anti-backflow filtration device according to claim 1, characterized in that, The drainage tube, suction tube, outer tube, and connecting tube are all glass tubes.

9. The anti-backflow filtration device according to claim 1, characterized in that, The anti-backflow filtration device also includes a rubber hose and a vacuum pump, which are connected in sequence.

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