Suction filtration device capable of preventing suck-back

Abstract

The utility model relates to the technical field of suction filtration equipment, and discloses a suction filtration device capable of preventing suck-back, which comprises a funnel, the inner surface of the funnel is fixedly connected with a filter screen, the bottom end of the funnel is fixedly connected with a blanking pipe, the lower surface of the blanking pipe is fixedly connected with a conical pipe, and the conical pipe is fixedly connected with the filter screen. And an anti-backflow mechanism is arranged at the bottom of the funnel. According to the suction filtration device capable of preventing suck-back, the anti-backflow mechanism is arranged, and matched with rising of filtrate, a sealing ball can move upwards under the action of buoyancy of the filtrate, so that the suction filtration device is in a sealed state, and the preliminary anti-backflow effect is achieved; and the conical pipe has a second anti-reflux effect, so that the condition that the solution is sucked back into the vacuum pump in the vacuum filtration process is avoided, the vacuum pump is prevented from being damaged by the suction filtration liquid, the service life of an instrument is prolonged, and the use cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vacuum filtration equipment technology, specifically a vacuum filtration device that can prevent backflow. Background Technology

[0002] In experiments in chemistry, biology, and medicine, it is often necessary to filter liquids to obtain high-purity solutions or solids. Vacuum filtration is a common solid-liquid separation method. Specifically, it uses the negative pressure created by vacuum pumping to accelerate the filtration of solutions. Generally, it refers to the process where, under the action of external forces such as driving force, the solution is forced through a filter medium, retaining solid particles and other substances.

[0003] According to a public announcement of an anti-backflow vacuum filtration device (Announcement No.: CN219783977U), the above application describes a device with a vacuum pump connecting pipe installed on the filtration head, one end of which is connected to the filtration head. The filtration head has an anti-backflow structure on its interior and outer wall. Using this anti-backflow vacuum filtration device, a good anti-backflow effect can be achieved, and the cost of use can be reduced.

[0004] However, in actual use, the anti-backflow mechanism of the aforementioned equipment only uses three buffer spaces to prevent backflow, and the existing anti-backflow mechanism relies solely on pressure difference to achieve a passive anti-backflow effect. In addition, the vacuum pump connecting pipe has a complex structure and is a fragile and easily damaged part. When the anti-backflow mechanism starts working, the vacuum pump is in an overloaded state. If the staff fails to detect this in time, it can easily damage the vacuum pump and affect the filtration efficiency in actual production. In view of this, we propose an anti-backflow filtration device. Utility Model Content

[0005] The purpose of this invention is to provide a backflow-preventing filtration device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A backflow-preventing filtration device includes a funnel, a filter screen fixedly connected to the inner surface of the funnel, a feed pipe fixedly connected to the bottom end of the funnel, a conical tube fixedly connected to the lower surface of the feed pipe, and an anti-backflow mechanism provided at the bottom of the funnel, the anti-backflow mechanism comprising:

[0007] The outer shell has an outer wall through which a feeding pipe is fixedly connected to its upper surface, a connecting pipe is provided on the side wall of the outer shell, a hole is provided on the lower surface of the outer shell, a rubber ring is fixedly connected to the inner surface of the hole, and a fixing block is fixedly connected to the inner wall of the outer shell.

[0008] A movable sleeve, the upper end of which is fixedly connected to the lower surface of a fixed block, a spring is fitted onto the outer surface of the movable sleeve, a connector is fixedly connected to the lower end of the movable sleeve, a connecting rod is fixedly connected to the inner side wall of the connector, and a sealing ball is fixedly connected to the lower surface of the connecting rod.

[0009] Preferably, the outer casing is provided with a sealing mechanism, the sealing mechanism including a baffle, the baffle being fixedly connected to the lower surface of the connector, a sealing strip being fixedly connected to the outer wall of the baffle, and a groove being formed on the outer surface of the outer casing, with a screen being fixedly connected to the inner surface of the groove.

[0010] Preferably, a storage cylinder is movably connected to the inner surface of the rubber ring, a graduated groove is provided on the outer surface of the storage cylinder, a discharge cylinder is provided on the outer surface of the storage cylinder, and a valve is provided inside the discharge cylinder.

[0011] Preferably, the lower inner surface of the storage cylinder is set as an inclined surface.

[0012] Preferably, the number of fixed blocks, movable sleeves, springs, and connecting rods is provided in multiple sets, and each set of fixed blocks, movable sleeves, springs, and connecting rods is distributed in a circumferential array on the upper surface of the connector.

[0013] Preferably, the connector is shaped like an octagon, with one end of the connecting tube connected to the inside of the housing and the other end fixedly connected to a vacuum pump.

[0014] Preferably, the sealing mechanism is provided in multiple sets, and each set of sealing mechanisms is distributed in a circumferential array on the outer wall of the housing.

[0015] Compared with the prior art, this utility model provides a backflow-preventing filtration device, which has the following beneficial effects:

[0016] 1. This anti-backflow filtration device, through the installation of an anti-backflow mechanism, works in conjunction with the rise of the filtrate. The sealing ball will move upward under the buoyancy of the filtrate. When the sealing ball contacts the rubber ring, the device will be in a sealed state, thus achieving a preliminary anti-backflow effect. If the sealing effect between the sealing ball and the rubber ring is not good, a conical tube can be used as a second anti-backflow effect, preventing the solution from being drawn back into the vacuum pump during vacuum filtration, preventing the filtrate from damaging the vacuum pump, extending the service life of the instrument, and reducing the cost of use.

[0017] 2. This anti-backflow filtration device is equipped with a sealing mechanism. When the anti-backflow mechanism starts to work, the sealing ball moves upward under the action of buoyancy, thereby driving the connecting rod to push the connecting piece upward. The baffle fixed to the lower surface of the connecting piece opens with the connecting piece, allowing external air to enter the anti-backflow mechanism and enabling the vacuum machine to continue to work normally. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the anti-backflow mechanism of this utility model.

[0021] Figure 4 This is a schematic diagram of the sealing mechanism of this utility model.

[0022] In the diagram: 1. Funnel; 101. Storage cylinder; 102. Discharge cylinder; 103. Scale groove; 104. Filter screen; 105. Feed pipe; 106. Conical tube; 107. Valve; 2. Anti-backflow mechanism; 201. Outer shell; 202. Connecting pipe; 203. Fixing block; 204. Movable sleeve; 205. Spring; 206. Connecting piece; 207. Connecting rod; 208. Rubber ring; 209. Sealing ball; 210. Hole; 3. Sealing mechanism; 301. Baffle; 302. Sealing strip; 303. Groove; 304. Screen. Detailed Implementation

[0023] like Figures 1-4 As shown, this utility model provides a technical solution: a backflow-proof filtration device, including a funnel 1, a filter screen 104 fixedly connected to the inner surface of the funnel 1, and multiple layers of filter paper can be placed on the inner wall of the funnel 1 to meet the filtration requirements of different materials. A feed pipe 105 is fixedly connected to the bottom end of the funnel 1, and a conical tube 106 is fixedly connected to the lower surface of the feed pipe 105. An anti-backflow mechanism 2 is provided at the bottom of the funnel 1. The anti-backflow mechanism 2 includes a shell 201, a connecting pipe 202, a fixing block 203, a movable sleeve 204, a spring 205, a connector 206, a connecting rod 207, a rubber ring 208, a sealing ball 209, and a perforation 210.

[0024] In an embodiment of this utility model, the upper surface of the outer shell 201 is penetrated and fixedly connected to the outer wall of the feed pipe 105, the side wall of the outer shell 201 is provided with a connecting pipe 202, the lower surface of the outer shell 201 is provided with a hole 210, the inner surface of the hole 210 is fixedly connected with a rubber ring 208, the inner wall of the outer shell 201 is fixedly connected with a fixing block 203, the upper end of the movable sleeve 204 is fixedly connected to the lower surface of the fixing block 203, the outer surface of the movable sleeve 204 is sleeved with a spring 205, one end of the spring 205 is fixedly connected to the lower surface of the fixing block 203, the other end of the spring 205 is fixedly connected to a connector 206, the inner side wall of the connector 206 is fixedly connected to a connecting rod 207, and the lower surface of the connecting rod 207 is fixedly connected to a sealing ball 209.

[0025] In one embodiment of this utility model, a sealing mechanism 3 is provided inside the outer shell 201. The sealing mechanism 3 includes a baffle 301, which is fixedly connected to the lower surface of the connector 206. A sealing strip 302 is fixedly connected to the outer wall of the baffle 301. The sealing strip 302 is shaped like an opening, and the coverage area of ​​the sealing strip 302 is larger than the area of ​​the groove 303. A groove 303 is provided on the outer surface of the outer shell 201. A screen 304 is fixedly connected to the inner surface of the groove 303. By providing a screen 304, the air entering the anti-backflow mechanism 2 will not cause damage or nuclear contamination to the vacuum pump and the interior of the anti-backflow mechanism 2.

[0026] In addition, a storage cylinder 101 is movably connected to the inner surface of the rubber ring 208. A scale groove 103 is provided on the outer surface of the storage cylinder 101, allowing the operator to observe the storage status of the filtrate through the scale groove 103. A discharge cylinder 102 is provided on the outer surface of the storage cylinder 101, and a valve 107 is provided inside the discharge cylinder 102. When the operator observes that the filtration is complete through the scale groove 103, the filtrate in the storage cylinder 101 can be discharged through the valve 107. The lower inner surface of the storage cylinder 101 is set as an inclined surface, which can better help the discharge cylinder 102 discharge the filtrate. At the same time, there are multiple sets of fixed blocks 203, movable sleeves 204, springs 205, and connecting rods 207, and each set of fixed blocks 203, movable sleeves 204, springs 205, and connecting rods 207 is arranged in a circumferential array on the upper surface of the connector 206.

[0027] In the embodiments of this utility model, the connector 206 is shaped like an octagon, one end of the connecting tube 202 is connected to the inside of the outer shell 201, and the other end is fixedly connected to a vacuum pump. There are multiple sets of sealing mechanisms 3, and each set of sealing mechanisms 3 is distributed in a circumferential array on the outer wall of the outer shell 201.

[0028] In this invention, the material to be filtered is placed inside the funnel 1. Using different filter papers and filter screens 104, the operator connects the vacuum pump to the connecting pipe 202. After turning on the vacuum pump, the equipment begins filtration. When the filtrate flows into the storage cylinder 101 through the anti-backflow mechanism 2, the operator can observe the inside of the storage cylinder 101 through the scale groove 103. As the filtrate rises, the sealing ball 209 rises due to buoyancy. The connecting rod 207, fixedly connected to the outer surface of the sealing ball 209, moves the connecting piece 206 upwards as the sealing ball 209 rises. As the connector 206 rises, the sealing ball 209 seals the rubber ring 208, thereby sealing the filtrate and preventing backflow. If the sealing effect of the sealing ball 209 fails, a second backflow prevention effect can be achieved by using the tapered tube 106 fixedly connected to the bottom of the feed pipe 105. At this time, as the connecting rod 207 drives the connector 206 to rise, the baffle 301 fixedly connected to the lower surface of the connector 206 will rise synchronously with the rise of the connector 206, allowing external air to enter the backflow prevention mechanism 2 and enabling the vacuum machine to continue to work normally.

[0029] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A backflow-preventing filtration device, comprising a funnel (1), wherein a filter screen (104) is fixedly connected to the inner surface of the funnel (1), a feed pipe (105) is fixedly connected to the bottom end of the funnel (1), and a tapered tube (106) is fixedly connected to the lower surface of the feed pipe (105), characterized in that: The bottom of the funnel (1) is provided with an anti-backflow mechanism (2), which includes: The outer shell (201) has an outer wall of a feed pipe (105) that is connected through and fixed to the upper surface of the outer shell (201), a connecting pipe (202) is provided on the side wall of the outer shell (201), a hole (210) is opened on the lower surface of the outer shell (201), a rubber ring (208) is fixedly connected to the inner surface of the hole (210), and a fixing block (203) is fixedly connected to the inner wall of the outer shell (201). A movable sleeve (204) is fixedly connected at its upper end to the lower surface of a fixed block (203). A spring (205) is fitted onto the outer surface of the movable sleeve (204). A connector (206) is fixedly connected to the lower end of the movable sleeve (204). A connecting rod (207) is fixedly connected to the inner side wall of the connector (206). A sealing ball (209) is fixedly connected to the lower surface of the connecting rod (207).

2. The anti-backflow filtration device according to claim 1, characterized in that: The outer shell (201) is provided with a sealing mechanism (3), which includes a baffle (301). The baffle (301) is fixedly connected to the lower surface of the connector (206). A sealing strip (302) is fixedly connected to the outer wall of the baffle (301). A groove (303) is opened on the outer surface of the outer shell (201). A screen (304) is fixedly connected to the inner surface of the groove (303).

3. The anti-backflow filtration device according to claim 1, characterized in that: The inner surface of the rubber ring (208) is movably connected to a storage cylinder (101), the outer surface of the storage cylinder (101) is provided with a scale groove (103), the outer surface of the storage cylinder (101) is provided with a discharge cylinder (102), and a valve (107) is provided inside the discharge cylinder (102).

4. The anti-backflow filtration device according to claim 3, characterized in that: The lower inner surface of the storage cylinder (101) is set as an inclined surface.

5. The anti-backflow filtration device according to claim 1, characterized in that: The number of fixed blocks (203), movable sleeves (204), springs (205), and connecting rods (207) is set in multiple groups, and each group of fixed blocks (203), movable sleeves (204), springs (205), and connecting rods (207) is arranged in a circumferential array on the upper surface of the connector (206).

6. The anti-backflow filtration device according to claim 1, characterized in that: The connector (206) is shaped like an octagon, and one end of the connecting tube (202) is connected to the inside of the outer shell (201), while the other end is fixedly connected to a vacuum pump.

7. A backflow-preventing filtration device according to claim 2, characterized in that: The sealing mechanism (3) is provided in multiple sets, and each set of sealing mechanism (3) is distributed in a circumferential array on the outer wall of the outer shell (201).

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