CN105158048B - A kind of drawing-in type solid-liquid separator - Google Patents

Abstract

The invention discloses a kind of drawing-in type solid-liquid separator, it is desirable to provide a kind of easy to operate, operating efficiency is high, and simultaneously multiple water samples can be carried out with the drawing-in type solid-liquid separator of pre-treatment operation.It includes casing and vaccum-pumping equipment with sealed internal chamber, the extraction liquor collecting device being arranged on casing, vaccum-pumping equipment is connected by vacuum lead with the inner chamber of casing, and box top is provided with some connection through holes, and the inner chamber bottom surface of casing is provided with the waste liquor recycling bin of upper end open；Extraction liquor collecting device is located above waste liquor recycling bin, extraction liquor collecting device includes being arranged on the installing plate in casing and above waste liquor recycling bin, set on a mounting board and connect the one-to-one extract collecting pipe of through hole with each, be arranged on body side and with the horizontal guide pin bushing of the intracavity inter-connection of casing and the guide rod being slidably arranged in horizontal guide pin bushing, horizontal guide pin bushing medial surface is provided with the first sealing ring, and the inner of guide rod is connected with installing plate.

Description

A suction type solid-liquid separator

technical field

The invention relates to a pretreatment device for water quality analysis and testing, in particular to a suction type solid-liquid separator for water quality analysis and testing.

Background technique

Solid phase extraction is a sample pretreatment technology developed in recent years. It is developed from the combination of liquid-solid extraction and column liquid chromatography. It is mainly used for the separation, purification and concentration of samples, which can improve the recovery rate of analytes and make it more Effectively separate analytes from interfering components , reduce sample pretreatment process, simple operation, save time and effort. Widely used in medicine, food, environment, commodity inspection, chemical industry and other fields.

In the pretreatment process of water quality analysis and testing, solid phase extraction mainly uses the packing in the solid phase extraction column to separate, purify and concentrate the water sample, and separate the interfering components in the water sample; the current specific operation is usually as follows:

First, add the water sample into the solid phase extraction column, and filter and separate the interfering components in the water sample by vacuuming, and collect the separated interfering components (water and other components) through the collection container, so that The analyte in the water sample is left in the solid phase extraction cartridge; then, the vacuum device will be turned off, the container for collecting the interfering components will be removed, and a new collection container will be used to collect the analyte; and then, An organic solvent is added to the solid phase extraction column to dissolve the analyte remaining in the solid phase extraction column, and the analyte and the organic solvent flow out from the solid phase extraction column into the collection container by vacuuming, thereby Complete the pretreatment of the water sample analysis test.

There are following deficiencies in the pretreatment device of current water quality analysis test:

First, during the pretreatment process of water samples, it is necessary to close the vacuum device and replace the collection container. The operation process is cumbersome, time-consuming and labor-intensive. Second, usually only one sample tube can be operated in one pretreatment process, which leads to a large amount of time spent in the actual detection of a large number of samples.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a suction type solid-liquid separator which is easy to operate, has high working efficiency, and can perform pretreatment operations on multiple water samples at the same time.

Technical scheme of the present invention is:

A suction type solid-liquid separator, comprising a box body with a sealed inner cavity and a vacuum pumping device, the vacuum pumping device communicates with the inner cavity of the box body through a vacuum pumping pipeline, and also includes an extracting liquid arranged on the box body A collection device, the top surface of the box body is provided with a number of connection through holes, and the bottom surface of the inner cavity of the box body is provided with a waste liquid recovery bucket with an upper end opening, and each connection through hole is located inside the upper port of the waste liquid recovery bucket; The extraction liquid collection device is located above the waste liquid recovery bucket, and the extraction liquid collection device includes a mounting plate arranged in the box and above the recovery bucket, and the extraction liquid collection plate is arranged on the mounting plate and corresponds to each connecting through hole one-to-one. tube, a horizontal guide sleeve arranged on the side of the box body and communicated with the inner cavity of the box body, and a guide rod slidably arranged in the horizontal guide sleeve, the inner side of the horizontal guide sleeve is provided with a first sealing ring, so The inner end of the guide rod is connected with the mounting plate.

The suction type solid-liquid separator of this scheme is easy to operate, has high working efficiency, and can perform pretreatment operations on multiple water samples at the same time to obtain pretreated samples.

Preferably, it also includes an adaptive airtight device, the box body includes a box body with an upper end opening and a box cover for sealing the box body and the upper end opening, and the edge of the box cover is provided with a circle of downward extending An annular side edge plate, and the annular side edge plate is sleeved on the box body;

The self-adaptive airtight device includes an installation groove arranged on the inner side of the annular side edge plate, an inflatable sealing ring and a pressure conversion cylinder arranged in the installation groove;

The inner cavity of the pressure conversion cylinder is composed of a first cavity and a second cavity which communicate with each other, and the inner diameter of the first cavity is larger than the inner diameter of the second cavity; the first cavity is provided with a first piston body, the second cavity is provided with a second piston body, and the first piston body and the second piston body are connected through a first connecting rod, and the pressure conversion cylinder is opened at one end close to the first piston body, close to One end of the second piston body is closed;

A first limit block is provided on the inner side of the first cavity, and the first limit block and the second piston body are located on the opposite sides of the first piston body, and the second cavity is provided to make the first piston body leaning against the first preloaded compression spring on the first limit block, and the first preloaded compression spring and the first piston body are located on opposite sides of the second piston body;

A first connection port and a second connection port are provided on the outer side of the pressure conversion cylinder, the first connection port communicates with the first cavity, and the first connection port is located between the first piston body and the second piston body ; the second connection port communicates with the second cavity, and the second connection port and the first piston body are located on opposite sides of the second piston body; the outer surface of the box body is provided with a third connection port, and the inflation A filling and exhausting nozzle is provided on the sealing ring, the first connecting port and the third connecting port are connected through a first communication pipe, and the second connecting port and the charging and discharging nozzle are connected through a second communicating pipe connected.

In order to facilitate the removal of the waste liquid recovery barrel and extraction liquid collection tube in the box, the box is usually equipped with a box cover; but in this way, a sealing structure needs to be set between the box cover and the box body to prevent The outside air enters the inner cavity of the box from between the box cover and the box body. At present, the sealing structure between the box cover and the box body is usually a sealing ring, and due to the problem of the matching accuracy of the box cover and the box body, it is often difficult for ordinary sealing rings to form a good seal. On the other hand, since the box cover needs to be opened/closed frequently, the sealing ring between the box cover and the box body is easy to loosen and a gap is formed, resulting in the outside gas entering the box cavity during the vacuuming process of the box cavity, which affects sample extraction liquid filtration. In addition, since the box cover needs to be opened/closed frequently, if a common inflatable sealing ring is used, the box cover cannot be opened/closed smoothly. This solution improves on this problem. It can effectively solve the problem of the cavity in the pumping tank caused by poor sealing between the tank cover and the tank body without affecting the normal use of the suction solid-liquid separator. Insufficient negative pressure affects the separation and extraction of samples.

Since the pressure conversion cylinder cavity between the first piston body and the second piston body communicates with the inner cavity of the box body through the first communication pipe, and the cross-sectional area of the first piston body is greater than that of the second piston body Therefore, the air pressure between the first piston body and the second piston body decreases during the vacuuming process, which makes the second piston body move toward the second limit block, so that the gas in the pressure conversion cylinder passes through the second The connecting pipe is pressed into the inner cavity of the inflatable sealing ring to expand the inflatable sealing ring, thereby ensuring that the inflatable sealing ring forms a reliable seal between the box cover and the box body; and as the negative pressure in the box inner cavity increases Large, the air pressure in the annular inflatable inner chamber of the inflatable sealing ring will also increase accordingly, thereby further ensuring that the inflatable sealing ring forms a reliable seal between the box cover and the box body, effectively solving the problem of problems caused by the box cover and the box body. The poor seal between them leads to insufficient negative pressure in the vacuum chamber, which affects the separation and extraction of samples. On the other hand, when the sample separation and extraction process is completed, the vacuuming equipment is closed, and the pressure in the inner cavity of the box is restored at this time, so that the first piston body and the second piston body are reset under the action of the first pre-tightened compression spring. When the inflatable sealing ring shrinks, the lid can be opened/closed smoothly to ensure the normal operation of the equipment.

Preferably, a fourth connection port communicating with the first cavity is provided on the outer side of the pressure conversion cylinder, and the fourth connection port is located between the first piston body and the second piston body, and the fourth connection port is An electromagnetic switch valve is provided; a fifth connection port communicating with the second cavity is provided on the outer side of the pressure conversion cylinder, and the fifth connection port and the first piston body are located on opposite sides of the second piston body. An electromagnetic switch valve is provided at the fifth connection port; a sixth connection port is provided on the outer surface of the box body, and an electromagnetic switch valve is provided at the sixth connection port.

Preferably, a second limiting block is provided on the inner side of the second cavity, and the second limiting block is located between the second piston body and the second connection port.

Preferably, the connecting through-holes are arranged vertically, each connecting through-hole is respectively inserted with a removable adapter, the outer surface of the adapter is provided with a second sealing ring, and the second sealing ring is located between the adapter and the connecting through-hole. Between; the upper end surface of the conversion joint is provided with a vertical insertion through hole, and a third sealing ring is provided on the inner side of the vertical insertion through hole. This solution is connected to the solid-phase extraction column through an adapter, so it can adapt to different types of solid-phase extraction columns by changing the adapter.

Preferably, a third limiting block is provided on the outer surface of the conversion joint above the connection through hole, and the third limiting block is located above the second sealing ring.

As a preference, an inner limit projection is provided on the outer surface of the guide rod and in the inner cavity of the box body, and when the inner limit projection abuts against the horizontal guide sleeve, the mounting plate moves to the waste liquid recovery bucket. on the outside of the port.

Preferably, an outer limiting protrusion is provided on the outer surface of the guide rod and outside the box, and when the outer limiting protrusion abuts against the horizontal guide sleeve, each extraction liquid collection tube is located directly below the corresponding connecting through hole .

As a preference, the mounting plate is arranged horizontally, and the mounting plate is provided with several mounting through-holes passing through the mounting plate and the lower surface, and the extraction liquid collection pipe is inserted into the corresponding mounting through-hole, and the outer surface of the extraction liquid collection pipe is And a fourth limit block is arranged above the mounting plate.

Preferably, the lower port of the connection through hole is provided with a diversion sleeve whose cross-section gradually decreases from top to bottom.

The invention has the advantages of convenient operation, high work efficiency, and the ability to perform pretreatment operations on multiple water samples at the same time.

Description of drawings

Fig. 1 is a schematic structural view of the suction solid-liquid separator of the present invention.

Fig. 2 is a schematic structural view of the self-adaptive airtight device of the present invention.

Fig. 3 is another structural schematic view of the suction solid-liquid separator of the present invention during operation.

In the figure: box body 1, box body 1a, box cover 1b, annular side edge plate 1b1, connecting through hole 2, conversion joint 3, vertical insertion through hole 31, diversion sleeve 4, self-adaptive airtight device 5 , Inflatable sealing ring 51, third connection port 52, first communication pipe 53, second communication pipe 54, pressure conversion cylinder 55, first connection port 56, second connection port 57, fifth connection port 58,

The first pre-tightening compression spring 59, the second cavity 510, the second limit block 511, the second piston body 512, the fourth connection port 513, the first cavity 514, the first piston body 515, the first limit block 516, extraction liquid collection device 6, mounting plate 61, extraction liquid collection pipe 62, fourth limit block 63, inner limit bump 64, horizontal guide sleeve 65, guide rod 66, outer limit bump 67, waste liquid Recovery barrel 7, suction port 8, sixth connection port 9, solid phase extraction column 10.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

As shown in FIG. 1 , a suction type solid-liquid separator includes a box body 1 with a sealed inner cavity, vacuum equipment, an adaptive airtight device 5 and an extraction liquid collecting device 6 arranged on the box body. The box body includes a box body 1a with an open upper end and a box cover 1b for covering the box body and the upper end opening. An annular side edge plate 1b1 extending downward is provided on the edge of the box cover, and the annular side edge plate is sheathed on the box body. The vacuuming equipment communicates with the inner cavity of the box body through a vacuuming pipeline, specifically, a suction port 8 is provided on the outer surface of the box body, and the vacuuming equipment is connected with the suction port through a vacuuming pipeline.

A plurality of connection through holes 2 are provided on the top surface of the box body, specifically, a plurality of connection through holes are provided on the top surface of the case cover. The connection vias are arranged vertically. The lower port connecting the through hole is provided with a diversion sleeve 4 whose cross-section gradually decreases from top to bottom. The connecting through hole is a round hole. Removable conversion joints 3 are respectively inserted in each connection through hole. A second sealing ring is provided on the outer surface of the conversion joint, and the second sealing ring is located between the conversion joint and the connection through hole. A third limiting block is arranged on the outer surface of the conversion joint and above the connecting through hole, and the third limiting block is located above the second sealing ring. The upper end surface of the conversion joint is provided with a vertical insertion through hole 31, and a third sealing ring is provided on the inner side of the vertical insertion through hole. A waste liquid recovery barrel 7 with an open upper end is provided on the bottom surface of the inner cavity of the box body, and each connecting through hole is located inside the upper port of the waste liquid recovery barrel.

The extraction liquid collection device is located above the waste liquid recovery barrel. The extraction liquid collecting device comprises the installation plate 61 that is arranged in the casing and is arranged on the top of the recovery barrel, the extraction liquid collection pipe 62 that is arranged on the installation plate and corresponds to each connecting through hole one by one, is arranged on the side of the casing and is connected with the casing. The horizontal guide sleeve 65 connected with the inner cavity of the body and the guide rod 66 slidably arranged in the horizontal guide sleeve. The mounting plate is set horizontally. The mounting plate is provided with a plurality of mounting through holes penetrating through the mounting plate and the lower surface. The upper end of the extraction solution collection tube is open and the lower end is closed. The extraction liquid collection tube is inserted into the corresponding installation through hole, and a fourth limiting block 63 is provided on the outer surface of the extraction liquid collection tube and above the mounting plate. A first sealing ring is arranged on the inner surface of the horizontal guide sleeve. The inner end of the guide rod is connected with the mounting plate.

As shown in Figure 1, an inner limit projection 64 is provided on the outer surface of the guide rod and in the inner cavity of the box body, and when the inner limit projection abuts against the horizontal guide sleeve, the mounting plate moves to the waste the outside of the upper port of the liquid recovery bucket. As shown in Figure 3, an outer limit bump 67 is provided on the outer surface of the guide rod and outside the box, and when the outer limit bump abuts against the horizontal guide sleeve, each extraction liquid collection tube is located in the corresponding connection channel. directly below the hole.

As shown in Fig. 1 and Fig. 2, the self-adaptive airtight device 5 includes a mounting groove disposed on the inner side of the annular side edge plate, an inflatable sealing ring 51 and a pressure conversion cylinder 55 disposed in the mounting groove. The inner cavity of the pressure conversion cylinder is stepped. The inner cavity of the pressure conversion cylinder is composed of a first cavity 514 and a second cavity 510 which communicate with each other, and the inner diameter of the first cavity is larger than the inner diameter of the second cavity. A first piston body 515 is disposed in the first cavity. A second piston body 512 is disposed in the second cavity, and the first piston body and the second piston body are connected through a first connecting rod. One end close to the first piston body is open on the pressure conversion cylinder body, and one end close to the second piston body is closed. A first limiting block 516 is disposed on the inner side of the first cavity, and the first limiting block and the second piston body are located on opposite sides of the first piston body. A second limiting block 511 is disposed on the inner side of the second cavity, and the second limiting block is located between the second piston body and the second connection port. The second cavity is provided with a first pre-tightened compression spring 59 that can make the first piston body lean against the first limit block, and the first pre-tightened compression spring and the first piston body are located on opposite sides of the second piston body .

A first connection port 56 and a second connection port 57 are provided on the outer side of the pressure conversion cylinder. The first connection port communicates with the first cavity, and the first connection port is located between the first piston body and the second piston body. The second connection port communicates with the second cavity, and the second connection port and the first piston body are located on opposite sides of the second piston body. A third connecting port 52 is provided on the outer surface of the box body. A fourth connection port 513 communicating with the first cavity is provided on the outer side of the pressure conversion cylinder, and the fourth connection port is located between the first piston body and the second piston body. The fourth connecting port is provided with an electromagnetic switch valve. A fifth connection port 58 communicating with the second cavity is provided on the outer side of the pressure conversion cylinder, and the fifth connection port and the first piston body are located on opposite sides of the second piston body. The fifth connecting port is provided with an electromagnetic switch valve. The outer surface of the box body is provided with a sixth connection port 9 communicating with the inner cavity of the main box. The sixth connection port is provided with an electromagnetic switch valve. The inflatable sealing ring is provided with an inflatable exhaust nozzle. The first connection port is connected with the third connection port through a first communication pipe 53 . The second connecting port is connected with the charging and exhausting nozzle through the second communication pipe 54 .

The specific working process of suction type solid-liquid separator of the present invention is as follows:

First, drive the installation plate and the extraction liquid collection tube to move through the guide rod until the inner limit projection abuts against the horizontal guide sleeve, at this time the installation plate moves to the outside of the upper port of the waste liquid recovery bucket, as shown in Figure 1 Show.

Simultaneously, as shown in Figure 3, insert the lower end of the solid phase extraction small column 10 in the vertical insertion through hole of the adapter, and through the third sealing ring in the vertical insertion through hole, connect the solid phase extraction small column and the A seal is formed between the conversion joints (the solid-phase extraction cartridges are respectively inserted in each vertical insertion hole); then, the water sample to be treated is added to the corresponding solid-phase extraction cartridge (the inside of each solid-phase extraction cartridge is Different water samples to be treated can be added).

Second, close the electromagnetic switching valves at the fourth, fifth and sixth connection ports, and turn on the vacuum equipment to vacuum the inner cavity of the box, so that the interfering components (water and other components) in the water sample The lower port of the solid-phase extraction cartridge drips into the waste liquid recovery bucket, and the analytes in the water sample remain in the solid-phase extraction cartridge.

As shown in Figure 1 and Figure 2, during the process of vacuuming the inner cavity of the box body by the vacuum equipment, due to the communication cylinder inner cavity between the first piston body and the second piston body through the first communication pipe It communicates with the inner cavity of the main box body, and the cross-sectional area of the first piston body is larger than that of the second piston body; thus, the air pressure between the first piston body and the second piston body decreases during vacuuming , so that the second piston body moves toward the second limit block, so that the gas in the communicating cylinder is pressed into the annular inflatable inner cavity of the inflatable sealing ring through the second communicating pipe, so that the inflatable sealing ring expands, and then Ensure that the inflatable sealing ring forms a reliable seal between the box cover and the box body.

Third, after the interfering components in the water sample are separated, the guide rod drives the mounting plate and the extraction liquid collection tube to move until the outer limit bumps abut against the horizontal guide sleeve. At this time, each extraction liquid collection tube is located at the corresponding directly below the connecting through hole, as shown in Figure 3;

Next, add an organic solvent to the solid phase extraction column to dissolve the analyte remaining in the solid phase extraction column, and the analyte dissolved in the organic solvent will drop from the lower port of the solid phase extraction column to the corresponding extract In the collection tube, the pretreatment of the water sample analysis test is completed.

Fourth, turn off the vacuuming equipment, and at the same time open the electromagnetic switch valves at the fourth, fifth and sixth connection ports, so that the first piston body and the second piston body are reset under the action of the pre-tightened compression spring. When the inflatable sealing ring shrinks (so that the box cover can be opened/closed smoothly); then, open the box cover and take out the extraction liquid collection tube.

Claims (9)

1. a kind of drawing-in type solid-liquid separator, including casing and vaccum-pumping equipment with sealed internal chamber, the vaccum-pumping equipment Connected by vacuum lead with the inner chamber of casing, it is characterized in that, in addition to adaptive gas check and be arranged on casing Liquor collecting device is extracted, the box top is provided with some connection through holes, and the inner chamber bottom surface of casing is provided with upper end open Waste liquor recycling bin, and each connection through hole is located at the inner side of the upper port of waste liquor recycling bin；The extraction liquor collecting device is positioned at useless Above liquid recycling bin, extraction liquor collecting device includes being arranged in casing and is arranged on the installing plate above recycling bin, is arranged on On installing plate and with it is each connection the one-to-one extract collecting pipe of through hole, be arranged on body side and with the inner chamber phase of casing The horizontal guide pin bushing of connection and the guide rod being slidably arranged in horizontal guide pin bushing, the horizontal guide pin bushing medial surface are provided with the first sealing Circle, the inner of the guide rod are connected with installing plate；

The box-like body of the casing including upper end open and for seal hide box-like body and upper end open case lid, the case Lid edge is provided with the annular side listrium that a circle down extends, and annular side listrium is set on box-like body；

The adaptive gas check includes the mounting groove being arranged on annular side listrium medial surface, is arranged on filling in mounting groove Gas formula sealing ring and pressure conversion cylinder body；

The inner chamber of the pressure conversion cylinder body is made up of interconnected the first cavity and the second cavity, and the internal diameter of the first cavity More than the internal diameter of the second cavity；Being provided with first piston body in first cavity, the second cavity is interior to be provided with second piston body, and the It is connected between one piston body and second piston body by head rod, close to first piston body on the pressure conversion cylinder body One end open, close to the closing of one end of second piston body；

The first inside cavities face is provided with the first limited block, and the first limited block is located at first piston body with second piston body Opposite sides, second cavity, which is provided with, can make the first pretension compression spring that first piston body is resisted against on the first limited block, And first pretension compression spring and first piston body be located at second piston body opposite sides；

The pressure conversion cylinder body lateral surface is provided with the first connector and the second connector, the first connector and the first cavity phase Connection, and the first connector is between first piston body and second piston body；Second connector is connected with the second cavity, and Second connector is located at second piston body opposite sides with first piston body；The box-like body lateral surface is provided with the 3rd connection Mouthful, the inflation seal ring, which is provided with, fills exhaust nozzle, is connected between first connector and the 3rd connector by first Pipeline is connected, and second connector is connected with filling between exhaust nozzle by the second connecting pipe.

2. a kind of drawing-in type solid-liquid separator according to claim 1, it is characterized in that, the pressure conversion cylinder body lateral surface Be provided with the 4th connector that is connected with the first cavity, and the 4th connector be located at first piston body and second piston body it Between, it is provided with electromagnetic switch valve at the 4th connector；Pressure conversion cylinder body lateral surface is provided with what is be connected with the second cavity 5th connector, and the 5th connector is located at second piston body opposite sides with first piston body, is set at the 5th connector There is electromagnetic switch valve；The box-like body lateral surface is provided with the 6th connector, and electromagnetic switch is provided with the 6th connector Valve.

3. a kind of drawing-in type solid-liquid separator according to claim 1, it is characterized in that, set on the second inside cavities face There is the second limited block, and the second limited block is between second piston body and the second connector.

4. a kind of drawing-in type solid-liquid separator according to claim 1, it is characterized in that, the connection through hole is vertically arranged, It is inserted with the crossover sub that can be taken off in each connection through hole respectively, the lateral surface of crossover sub is provided with the second sealing ring, and the Two sealing rings are located between crossover sub and connection through hole；The crossover sub upper surface is provided with vertical grafting through hole, and vertically Grafting through hole medial surface is provided with the 3rd sealing ring.

5. a kind of drawing-in type solid-liquid separator according to claim 4, it is characterized in that, on the crossover sub lateral surface simultaneously The 3rd limited block is provided with above connection through hole, and the 3rd limited block is located above the second sealing ring.

6. a kind of drawing-in type solid-liquid separator according to claim 1 or 2 or 3 or 4 or 5, it is characterized in that, outside the guide rod Interior spacing block set is provided with side and positioned at the interior intracavitary of casing, and when interior spacing block set is resisted against horizontal guide pin bushing, it is described Installing plate is moved to the outside of the upper port of waste liquor recycling bin.

7. a kind of drawing-in type solid-liquid separator according to claim 1 or 2 or 3 or 4 or 5, it is characterized in that, outside the guide rod Outer spacing block set is provided with side and on the outside of casing, and when outer spacing block set is resisted against horizontal guide pin bushing, each extract Collecting pipe is positioned at the underface of corresponding connection through hole.

8. a kind of drawing-in type solid-liquid separator according to claim 1 or 2 or 3 or 4 or 5, it is characterized in that, the installing plate Horizontally disposed, installing plate is provided with some installation through-holes through the upper and lower surface of installing plate, and the extract collecting pipe is plugged in In corresponding installation through-hole, and the 4th limited block is provided with extract collecting pipe lateral surface and above installing plate.

9. a kind of drawing-in type solid-liquid separator according to claim 1 or 2 or 3 or 4 or 5, it is characterized in that, the connection is logical The lower port in hole is provided with the flow guide sleeve that cross section is gradually reduced from top to bottom.