CN215901980U - Centrifuge rotor for centrifuging soil - Google Patents
Centrifuge rotor for centrifuging soil Download PDFInfo
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- CN215901980U CN215901980U CN202122186802.4U CN202122186802U CN215901980U CN 215901980 U CN215901980 U CN 215901980U CN 202122186802 U CN202122186802 U CN 202122186802U CN 215901980 U CN215901980 U CN 215901980U
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Abstract
The utility model discloses a centrifuge rotor for centrifuging soil, and relates to the technical field of centrifuges. Four centrifugal cups are arranged in the rotor body, a rotor pressure head is arranged in the middle of the rotor body, and a rotor cover is arranged on the rotor body through a central nut and a shaft check ring; the centrifugal cup is including the retainer cup, a pedestal, the sampling cutting ring, the centrifugal bowl cover, gather the bowl cover, filter paper, filter the pad, the retainer cup is connected with the internal thread of base through the external screw thread, the junction of retainer cup and base sets up through first sealing washer is sealed, be provided with the cavity of storing centrifugation back water solution in the base, filter the pad has been placed in the retainer cup, filter the pad upper berth and be equipped with filter paper, the grafting has the sampling cutting ring in the retainer cup, the sampling cutting ring top has been covered and has been gathered the bowl cover, the centrifugal bowl cover has been covered on the retainer cup, through the sealed setting of second sealing washer between centrifugal bowl cover and the retainer cup. The utility model has simple operation, can effectively save the operation time, can measure a wider suction range at the same time, reduces the cost and has wide application prospect.
Description
Technical Field
The utility model relates to the technical field of centrifuges, in particular to a centrifuge rotor for centrifuging soil.
Background
The soil water matric potential or soil water suction varies with the soil water content, and the relation curve is called soil water characteristic curve. The curve reflects the relation between the soil moisture energy and quantity, is an essential important parameter for researching the soil hydrodynamic property ratio, and has important significance in production practice. In agronomic studies, since crops have limited ability to tolerate drought, pressures of up to 15bar are typical, and default to a maximum value, when the soil is already extremely dry. Existing assays include tensiometers, pressure film gauges, and centrifuge methods.
(1) The tensiometer measures the water potential of soil, and if the water content of soil is measured by any method, a set of data can be obtained, and when the water potential of soil changes, the water content of soil under different water potentials can be obtained, i.e. a soil characteristic curve can be drawn.
(2) The pressure membrane instrument is applied to many fields in China, the data obtained by measurement of the equipment is internationally acknowledged, the principle of the pressure membrane instrument is that a high-pressure air pump or a high-pressure nitrogen bottle is used for inflating and pressurizing a sealed container, the pressure range is adjustable, a soil sample is placed in the pressure membrane instrument from 0 bar to 15bar, a specially-made ceramic plate is arranged below the pressure membrane instrument, the ceramic plate plays a role in water and air permeation and tightness, water seeped from the pressurized soil is transferred to the outside of the sealed container, after 24 hours, the water in the sample is kept constant, the sample is taken out, weighed and dried, then weighed again, the water content is measured, and the like, and the soil characteristic curve can be obtained.
(3) The centrifugal machine method is that a centrifugal machine is used for carrying out centrifugal operation on soil, so that moisture in the soil is separated from the soil under the action of centrifugal force and enters a water storage container, the moisture content in the soil is indirectly measured, the maximum rotating speed of a soil rotor can reach 13500rpm, the maximum relative centrifugal force can reach 17828 Xg, g represents a gravity acceleration unit, and the moisture in the soil can be easily separated out due to strong centrifugal force, so that a higher pressure range can be reached.
In summary, the disadvantage of using a tensiometer is that the pressure range is too small to reach the wilting coefficient of the plant, on one hand, the soil moisture is not reduced to that low, and on the other hand, the measuring range of the tensiometer itself is very limited; the pressure membrane instrument has the disadvantages of complicated operation, long operation time and high cost. Based on this, it is especially necessary to design a new centrifuge rotor for centrifuging soil.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide the centrifuge rotor for centrifuging soil, which has the advantages of simple structure, reasonable design, simple operation, effective time saving, capability of measuring a wider suction range, low cost, strong practicability and easiness in popularization and use.
In order to achieve the purpose, the utility model is realized by the following technical scheme: a centrifuge rotor for centrifuging soil comprises a rotor body, a rotor cover, a central nut, a retaining ring for a shaft, centrifugal cups and a rotor pressure head, wherein four centrifugal cups are arranged in the rotor body; the centrifugal cup including the retainer cup, a pedestal, the sampling cutting ring, the centrifugal cup lid, gather the bowl cover, filter paper, filter the pad, first sealing washer and second sealing washer, the retainer cup is connected with the internal thread of base through the external screw thread, the junction of retainer cup and base is through the sealed setting of first sealing washer, be provided with the cavity of storing centrifugation back water solution in the base, filter the pad has been placed in the retainer cup, filter the pad upper berth and be equipped with filter paper, the grafting has the sampling cutting ring in the retainer cup, the sampling cutting ring top has been cup-covered and has been gathered the bowl cover, the bowl cover has been covered and has been connect the centrifugal cup lid on the retainer cup, set up through the sealed second sealing washer between centrifugal cup lid and the retainer cup.
Preferably, the base of the centrifugal cup is in the shape of an arc, and the arc of the base of the centrifugal cup is attached to the arc of the inner wall of the rotor body.
Preferably, the centrifugal cups are symmetrically arranged in the rotor body, and four annular blocks for positioning the centrifugal cups are arranged in the middle of the rotor body.
Preferably, the inner ring of the base is provided with an annular groove for placing the first sealing ring; and an annular groove for placing a second sealing ring is arranged at the periphery of the upper layer of the sleeve cup.
Preferably, the step at the bottom of the sleeve cup is attached to the step above the base.
Preferably, the cover cup and the base are both provided with lettering identification areas, and the numbers of the two lettering identification areas on the same centrifugal cup are consistent and the positions of the two lettering identification areas are aligned.
Preferably, one side of the sampling cutting ring with soil is attached to the filter paper.
The utility model has the beneficial effects that: the device is simple to operate, can effectively save the operation time, can measure a wider suction range, reduces the cost and has a wide application prospect.
Drawings
The utility model is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the placement of a centrifuge cup of the present invention within a rotor body;
FIG. 3 is a schematic view of the internal structure of the centrifuge cup of the present invention;
FIG. 4 is a schematic view showing the external structure of the centrifuge cup of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.
Referring to fig. 1 to 4, the following technical solutions are adopted in the present embodiment: a centrifuge rotor for centrifuging soil comprises a rotor body 1, a rotor cover 2, a central nut 3, a shaft retainer ring 4, centrifugal cups 5 and a rotor pressure head 6, wherein four centrifugal cups 5 are placed in the rotor body 1, the rotor pressure head 6 is arranged in the middle of the rotor body 1, and the rotor cover 2 is arranged on the rotor body 1 through the central nut 3 and the shaft retainer ring 4; the centrifugal cup 5 comprises a sleeve cup 501, a base 502, a sampling cutting ring 503, a centrifugal cup cover 504, a collecting cup cover 505, filter paper 506, a filter gasket 507, a first seal ring 508 and a second seal ring 509, wherein the sleeve cup 501 is connected with an internal thread of the base 502 through an external thread, an annular groove for placing the first seal ring 508 is arranged on an inner ring of the base 502, a joint of the sleeve cup 501 and the base 502 is hermetically arranged through the first seal ring 508, a bottom step of the sleeve cup 501 is attached to a step above the base 502, a cavity 510 for storing centrifuged aqueous solution is arranged in the base 502, the filter gasket 507 is arranged in the sleeve cup 501, the filter paper 506 is laid on the filter gasket 507, the sampling cutting ring 503 is inserted in the sleeve cup 501, the collecting cup cover 505 is covered above the sampling cutting ring 503, the centrifugal cup cover 504 is covered on the sleeve cup 501, an annular groove for placing the second seal ring 509 is arranged on the upper periphery of the sleeve cup 501, the centrifugal cup cover 504 and the sleeve cup 501 are sealed by a second sealing ring 509.
It is noted that the rotor body 1 is provided in the middle with four annular blocks 7 which position the centrifuge cups 5.
It is noted that the side of the sampling ring 503 having soil is attached to the filter paper 506.
In addition, the cover cup 501 and the base 502 are both provided with the lettering identification areas 511, the numbers of the two lettering identification areas 511 on the same centrifugal cup are consistent and the positions of the two lettering identification areas 511 are aligned, after the cover cup 501, the base 502 and the first sealing ring 508 are screwed up in a matching manner, the position of the lettering identification area 511 is determined to be in the center of one surface of the base 502, and the position should be right above during centrifugation.
In the embodiment, the sampling ring cutter 503 in the centrifugal cup 5 is used for collecting soil, soil at two ends of the sampling ring cutter 503 needs to be flattened after soil is collected, a collection cup cover 505 is covered at one end to prevent soil from leaking, and the cavity 510 of the base 502 is used for storing centrifuged aqueous solution; when the centrifugal cup 5 is assembled, the first sealing ring 508 is firstly placed in the annular groove of the base 502 to be paved, then the external thread of the sleeve cup 501 is matched with the internal thread of the base 502, the centrifugal cup is rotated until the bottom step of the sleeve cup 501 is tightly attached to the upper step of the base 502, the filtering pad 507 is placed in the sleeve cup 501, a layer of round dry filtering paper 506 is laid on the filtering pad 507, and the filtering pad 507 and the filtering paper 506 are used for filtering out particles in soil; then the sampling cutting ring 503 with collected soil is inserted into the sleeve cup 501, the surface with soil is attached with the filter paper 506, the collecting cup cover 505 faces upwards, the second sealing ring 509 is sleeved in the upper annular groove of the sleeve cup 501, and finally the sampling cutting ring 504 is buckled on the upper step of the sleeve cup 501 and covered.
In the specific embodiment, the centrifugal cups 5 need to be symmetrically placed in the rotor body 1, the centrifugal cups 5 are positioned through the annular block 7, the bases 502 of the centrifugal cups 5 are arc-shaped, the arcs of the bases in the centrifugal cups 5 are attached to the arcs of the inner wall of the rotor body 1, meanwhile, characters are engraved on the centrifugal cups 5, the numbers of the bases 502 and the sleeves 501 are aligned, and the side with the numbers faces upward, so that a user can judge whether the sleeves are screwed in place through number alignment; on the other hand, the user can record the soil sample through the digital number without confusion. After the centrifugal cup 5 is placed, the rotor cover 2 is covered, and the central nut 3 is screwed down. During centrifugation, the rotor body 1 rotates at a high speed to generate a strong centrifugal force, and water in soil permeates through the filter paper 506 and the filter pad 507 under the influence of the centrifugal force and then flows into the water storage part of the base 502 through the small holes on the sleeve cup 501.
The use modes of the embodiment are as follows: (1) collecting quantitative soil in a quantitative sampling cutting ring, and separating water in the soil by a centrifugal method; the water holding capacity of the soil at a specific pressure is expressed by pF value.
(2) Adding quantitative fine particle dry soil into a quantitative sampling cutting ring, adding quantitative water, and separating water from the soil by a centrifugal method; the water holding capacity of the soil at a specific pressure is expressed by pF value.
The water potential calculation formula of the centrifugal method is as follows:
H＝(r1-h/2)hn21.118×10-5 (1)
calculation method of pF value: taking logarithm log of H as pF value. In formula (1): r is1And H is a fixed value, n is an independent variable, and H is a dependent variable. Wherein r is1Is the centrifugal radius, in cm; h is the height of 1/2 cutting ring or the height of 1/2 in the cutting ring soil, and the unit is cm; n is the rotation speed in r/min.
The measuring range of the rotor in the embodiment is 0.1bar-37.4bar, a wider suction range can be measured, meanwhile, the time is effectively saved, the operation is convenient, and the rotor can be widely used for the investigation of the soil resources and has wide market application prospect.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (8)
1. The centrifuge rotor for centrifuging soil is characterized by comprising a rotor body (1), a rotor cover (2), a central nut (3), a retaining ring (4) for a shaft, four centrifuge cups (5) and a rotor pressure head (6), wherein the rotor body (1) is internally provided with the four centrifuge cups (5), the rotor pressure head (6) is arranged in the middle of the rotor body (1), and the rotor cover (2) is arranged on the rotor body (1) through the central nut (3) and the retaining ring (4) for the shaft; the centrifugal cup (5) comprises a sleeve cup (501), a base (502), a sampling cutting ring (503), a centrifugal cup cover (504), a collecting cup cover (505), filter paper (506), a filter pad (507), a first seal ring (508) and a second seal ring (509), the utility model provides a centrifugal cup comprises a cover cup body, a base, a filter pad (507), filter paper (506), a sampling cutting ring (503) is inserted in the cover cup body (501), a collection cup cover (505) is covered above the sampling cutting ring (503), a centrifugal cup cover (504) is covered on the cover cup body (501), the centrifugal cup cover (504) and the cover cup body (501) are sealed through a second sealing ring (509) and are arranged between the centrifugal cup cover (504) and the cover cup body (501).
2. A centrifuge rotor for centrifuging soil in accordance with claim 1 wherein the base (502) of the centrifuge cup (5) is arcuate and the arc of the base of the centrifuge cup (5) conforms to the arc of the inner wall of the rotor body (1).
3. A centrifuge rotor for centrifuging soil in accordance with claim 1, wherein the centrifuge cups (5) are symmetrically placed in the rotor body (1), and the middle of the rotor body (1) is provided with four annular blocks (7) for positioning the centrifuge cups (5).
4. A soil centrifuging rotor as in claim 1 wherein the inner race of the base (502) is provided with an annular groove for receiving the first seal (508).
5. A centrifuge rotor for soil centrifugation according to claim 1, characterised in that the upper periphery of the cup (501) is provided with an annular groove for the placement of a second sealing ring (509).
6. A soil centrifuging rotor as claimed in claim 1 wherein the bottom step of the cup (501) is adapted to engage the upper step of the base (502).
7. A centrifuge rotor for centrifuging soil in accordance with claim 1 wherein said cup set (501) and said base (502) are each provided with a lettering mark area (511), and two lettering mark areas (511) on the same centrifuge cup are numbered and aligned.
8. A centrifuge rotor for centrifuging soil as in claim 1 wherein the sampling ring cutter (503) has a soil side that is attached to the filter paper (506).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122186802.4U CN215901980U (en) | 2021-09-10 | 2021-09-10 | Centrifuge rotor for centrifuging soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122186802.4U CN215901980U (en) | 2021-09-10 | 2021-09-10 | Centrifuge rotor for centrifuging soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215901980U true CN215901980U (en) | 2022-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122186802.4U Active CN215901980U (en) | 2021-09-10 | 2021-09-10 | Centrifuge rotor for centrifuging soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215901980U (en) |
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2021
- 2021-09-10 CN CN202122186802.4U patent/CN215901980U/en active Active
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