Air-tight seal bottom valve for centrifugal machine

Abstract

The utility model discloses an air-tight seal bottom valve for a centrifugal machine, and relates to the technical field of centrifugal machines. The air-tight seal bottom valve for the centrifugal machine comprises a hollow valve seat, a discharging port formed in the valve seat, a piston movably arranged in the valve seat and a driving piece used for driving the piston to move, the piston is provided with a first position inserted into the discharging port and a second position separated from the discharging port, and when the piston is located at the first position, the piston is driven to move. A sealing cavity is formed between the outer wall of the piston and the inner wall of the discharging port, the air-tight seal bottom valve further comprises an air pipe communicated with the sealing cavity, and the air pipe is used for inputting sealing air into the sealing cavity. According to the air-tight seal bottom valve, the gap between the outer wall of the piston and the inner wall of the discharging port can be sealed through the inflated seal cavity, when a centrifugal machine operates, the seal cavity can achieve internal and external isolation of materials, the sealing effect is good, the inflated seal cavity does not have the problem of aging and abrasion, and the sealing service life is long.

Description

Technical Field

[0001] The present application relates to the technical field of centrifuges, and in particular to an airtight bottom valve for centrifuges. Background Art

[0002] A centrifuge is a machine that uses centrifugal force to separate liquids from solid particles or components in a mixture of liquids and liquids. A bottom valve is usually set at the bottom of the centrifuge. The bottom valve includes a valve seat and a piston. The discharge of materials in the centrifuge is achieved by the relative opening and closing of the valve seat and the piston.

[0003] When the valve seat and the piston are relatively closed, there is still a certain gap between them. In order to ensure the normal operation of the centrifuge, the gap needs to be sealed. In the prior art, sealing is generally achieved by adding an airbag in the gap. However, the use of airbag sealing not only increases the complexity of the structure and increases the overall cost of the equipment, but also the airbag will age and wear after long-term use, affecting its sealing effect on the gap. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the present application provides an airtight bottom valve for a centrifuge.

[0005] The present application provides a centrifuge airtight bottom valve using the following technical solution:

[0006] An airtight bottom valve for a centrifuge comprises a hollow valve seat, a discharge port opened on the valve seat, a piston movably arranged in the valve seat, and a driving member for driving the piston to move, wherein the piston has a first position in which it is inserted in the discharge port and a second position in which it is detached from the discharge port, and when the piston is in the first position, a sealed cavity is formed between an outer wall of the piston and an inner wall of the discharge port, and the airtight bottom valve further comprises an air pipe connected to the sealed cavity, and the air pipe is used to input a sealing gas into the sealed cavity.

[0007] By adopting the above technical solution, the gap between the outer wall of the piston and the inner wall of the discharge port can be sealed by the inflated sealing chamber. When the centrifuge is running, the sealing chamber can achieve internal and external isolation of the material, and the sealing effect is good. In addition, the inflated sealing chamber does not have the problem of aging and wear, and the sealing life is long. At the same time, there is no need to set up an air bag, which simplifies the equipment structure and reduces the equipment cost.

[0008] In a specific possible implementation scheme, the piston includes a plug body and a sealing portion arranged at one end of the plug body, and at least two sealing rings are sleeved on the sealing portion. When the piston is in the first position, the sealing portion is accommodated in the discharge port. At this time, the sealing ring is in conflict with the inner wall of the discharge port, and the outer wall of the sealing portion, the two sealing rings and the inner wall of the discharge port enclose the sealed cavity.

[0009] By adopting the above technical solution, the sealing ring can prevent the sealing gas from leaking out, and further improve the sealing effect of the sealing cavity on the gap between the outer wall of the piston and the inner wall of the discharge port.

[0010] In a specific possible implementation manner, a sealing groove is circumferentially formed on at least one of the outer wall of the sealing portion and the inner wall of the discharge port, there are two sealing rings, and the sealing groove is located between the two sealing rings.

[0011] By adopting the above technical solution, the sealing groove can accommodate more sealing gas, further improving the sealing effect of the sealing cavity on the gap between the outer wall of the piston and the inner wall of the discharge port.

[0012] In a specific possible implementation mode, the sealing groove is arranged on the outer wall of the sealing portion, the piston is arranged hollow, the air pipe is accommodated in the piston and one end of the air pipe is connected to the bottom of the sealing groove.

[0013] By adopting the above technical solution, the interference of the air pipe with the discharge of the material in the valve seat is effectively avoided.

[0014] In a specific possible implementation mode, an end of the plug body away from the sealing portion is connected to a retractable connecting tube, and the retractable direction of the connecting tube is the same as the moving direction of the piston.

[0015] By adopting the above technical solution, the telescopic connecting pipe can realize the movable guidance of the piston and will not interfere with the movable stroke of the piston.

[0016] In a specific possible implementation scheme, the driving member is accommodated in the connecting tube, the output end of the driving member passes through the plug body and is connected to the sealing portion, and the air pipe spirally surrounds the circumference of the driving member.

[0017] By adopting the above technical solution, the driving member can be prevented from interfering with the discharge of materials in the valve seat; at the same time, the air pipe spiral is set so that the air pipe can have sufficient stretching margin to prevent the air pipe from being broken during the movement of the piston.

[0018] In a specific implementation scheme, a feed port is further provided on the valve seat, and the feed port and the discharge port are respectively located at two ends of the valve seat, and the inner diameter of the valve seat gradually decreases along the direction from the feed port to the discharge port.

[0019] By adopting the above technical solution, the discharge of materials is greatly facilitated.

[0020] In a specific possible implementation mode, a feed seat is provided on the valve seat, the feed port is opened on the feed seat, and the piston is movably provided on the feed seat along a direction from the feed port to the discharge port.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. The gap between the outer wall of the piston and the inner wall of the discharge port can be sealed by an inflated sealing chamber. When the centrifuge is running, the sealing chamber can isolate the inside and outside of the material, and the sealing effect is good;

[0023] 2. The inflated sealing cavity does not have the problem of aging and wear, and the sealing life is longer;

[0024] 3. No need to set up airbags, which simplifies the equipment structure and reduces equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the airtight bottom valve of an embodiment of the present application.

[0026] Figure 2 yes Figure 1 Enlarged schematic diagram at point A in the middle.

[0027] Description of reference numerals:

[0028] 1. Valve seat; 2. Discharge port; 3. Piston; 31. Plug body; 32. Sealing part; 4. Driving member; 5. Sealing chamber; 6. Air pipe; 7. Sealing ring; 8. Sealing groove; 9. Connecting pipe; 10. Feed seat; 101. Feed port; 102. Feed ring; 103. Feed rack. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings.

[0030] See also Figure 1-2As shown, there is shown an airtight bottom valve for a centrifuge, comprising a hollow valve seat 1, a discharge port 2 opened at the bottom of the valve seat 1, a piston 3 movable in the valve seat 1 along the vertical direction, and a driving member 4 for driving the piston 3 to move. The piston 3 has a first position inserted in the discharge port 2 and a second position separated from the discharge port 2. When the piston 3 is in the first position, a sealing cavity 5 is formed between the outer wall of the piston 3 and the inner wall of the discharge port 2. The airtight bottom valve also includes an air pipe 6 connected to the sealing cavity 5, and the air pipe 6 is used to input sealing gas into the sealing cavity 5. Among them, one end of the air pipe 6 away from the sealing cavity 5 is connected to an external gas source. The gap between the valve seat 1 and the piston 3 is sealed by the inflated sealing cavity 5. When the centrifuge is running, the sealing cavity 5 can achieve internal and external isolation of the material, and the sealing effect is good. Moreover, the inflated sealing cavity 5 does not have the problem of aging and wear, and the sealing life is long. At the same time, there is no need to set up an air bag, which simplifies the equipment structure and reduces the equipment cost.

[0031] Specifically, when the bottom valve is closed, the piston 3 reaches the first position, and the end of the piston 3 is accommodated in the discharge port 2. At this time, the sealing gas is input into the sealing chamber 5 through the air pipe 6, and the gap between the outer wall of the piston 3 and the inner wall of the discharge port 2 can be sealed by the inflated sealing chamber 5; when the bottom valve is opened, the piston 3 reaches the second position, and the gas source is closed at this time, and the air pipe 6 stops conveying the sealing gas.

[0032] In this embodiment, the piston 3 includes a plug body 31, a sealing portion 32 disposed at the lower end of the plug body 31, and two sealing rings 7 are sleeved on the sealing portion 32. When the piston 3 is in the first position, the sealing portion 32 is accommodated in the discharge port 2, and the sealing ring 7 is in conflict with the inner wall of the discharge port 2. The outer wall of the sealing portion 32, the two sealing rings 7 and the inner wall of the discharge port 2 form a sealed cavity 5. The two sealing rings 7 can prevent the sealing gas from leaking out, and further enhance the sealing effect of the sealing cavity 5 on the gap between the outer wall of the piston 3 and the inner wall of the discharge port 2.

[0033] A sealing groove 8 is circumferentially formed on the outer wall of the sealing portion 32, and there are two sealing rings 7, and the sealing groove 8 is located between the two sealing rings 7. The sealing groove 8 can accommodate more sealing gas, further improving the sealing effect of the sealing cavity 5 on the gap between the outer wall of the piston 3 and the inner wall of the discharge port 2.

[0034] In this embodiment, the piston 3 is hollow, the air pipe 6 is accommodated in the piston 3 and one end of the air pipe 6 is connected to the bottom of the sealing groove 8. Since the inside of the valve seat 1 is used for the flow of materials, the air pipe 6 is arranged in the piston 3, which can effectively prevent the air pipe 6 from interfering with the discharge of materials in the valve seat 1.

[0035] In this embodiment, a retractable connecting tube 9 is connected to the upper end of the plug body 31, and the retractable direction of the connecting tube 9 is the same as the moving direction of the piston 3. The connecting tube 9 is a bellows, and the retractable bellows can guide the movement of the piston 3 without interfering with the moving stroke of the piston 3.

[0036] The driving member 4 is accommodated in the connecting tube 9, the output end of the driving member 4 passes through the plug body 31 and is connected to the sealing portion 32, and the air pipe 6 is spirally wrapped around the circumference of the driving member 4. The driving member 4 is a cylinder, the cylinder body of the cylinder is arranged in the connecting tube 9, the piston rod of the cylinder passes through the plug body 31 and drives the sealing portion 32 to move, so that the driving member 4 can avoid interfering with the discharge of materials in the valve seat 1. At the same time, the air pipe 6 is spirally arranged so that the air pipe 6 can have sufficient stretching margin to prevent the air pipe 6 from being broken during the movement of the piston 3.

[0037] In this embodiment, a feed seat 10 is provided at the upper end of the valve seat 1, a feed port 101 is provided on the feed seat 10, the inner diameter of the valve seat 1 gradually decreases along the direction from the feed port 101 to the discharge port 2, and the piston 3 is movably provided at the bottom of the feed seat 10 along the direction from the feed port 101 to the discharge port 2. The valve seat 1 is in an inverted truncated cone shape, the piston 3 is in a columnar shape, and the piston 3 is coaxially arranged with the valve seat 1.

[0038] The feed seat 10 comprises a feed ring 102 and a feed frame 103 connected in the feed ring 102 . A plurality of feed ports 101 are formed between the feed frame 103 and the feed ring 102 . The piston 3 is arranged on the feed frame.

[0039] The implementation principle of a gas-tight bottom valve in the embodiment of the present application is:

[0040] When the bottom valve is closed, the piston 3 reaches the first position, and the end of the piston 3 is accommodated in the discharge port 2. At this time, the sealing gas is input into the sealing chamber 5 through the air pipe 6, and the outer wall of the piston 3 and the inner wall of the discharge port 2 can be sealed by the inflated sealing chamber 5; when the bottom valve is opened, the piston 3 reaches the second position, and the gas source is closed at this time, and the air pipe 6 stops conveying the sealing gas.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An airtight bottom valve for a centrifuge, comprising a hollow valve seat (1), a discharge port (2) provided on the valve seat (1), a piston (3) movably arranged in the valve seat (1), and a driving member (4) for driving the piston (3) to move, characterized in that: The piston (3) has a first position in which it is inserted into the discharge port (2) and a second position in which it is detached from the discharge port (2). When the piston (3) is in the first position, a sealed cavity (5) is formed between the outer wall of the piston (3) and the inner wall of the discharge port (2). The airtight bottom valve also includes an air pipe (6) connected to the sealed cavity (5), and the air pipe (6) is used to input a sealed gas into the sealed cavity (5).

2. The hermetic sealing bottom valve for a centrifuge according to claim 1, characterized in that: The piston (3) comprises a plug body (31) and a sealing portion (32) arranged at one end of the plug body (31). At least two sealing rings (7) are sleeved on the sealing portion (32). When the piston (3) is in the first position, the sealing portion (32) is accommodated in the discharge port (2). At this time, the sealing ring (7) is in conflict with the inner wall of the discharge port (2). The outer wall of the sealing portion (32), the two sealing rings (7) and the inner wall of the discharge port (2) form the sealing cavity (5).

3. The hermetic sealing bottom valve for a centrifuge according to claim 2, characterized in that: A sealing groove (8) is provided in an annular direction on at least one of the outer wall of the sealing portion (32) and the inner wall of the discharge port (2), and there are two sealing rings (7), and the sealing groove (8) is located between the two sealing rings (7).

4. The hermetic sealing bottom valve for a centrifuge according to claim 3, characterized in that: The sealing groove (8) is arranged on the outer wall of the sealing portion (32), the piston (3) is arranged hollow, the air pipe (6) is accommodated in the piston (3) and one end of the air pipe (6) is connected to the bottom of the sealing groove (8).

5. The hermetic sealing bottom valve for a centrifuge according to claim 2, characterized in that: One end of the plug body (31) away from the sealing portion (32) is connected to a retractable connecting tube (9), and the retractable direction of the connecting tube (9) is the same as the moving direction of the piston (3).

6. The hermetic sealing bottom valve for a centrifuge according to claim 5, characterized in that: The driving member (4) is accommodated in the connecting tube (9), the output end of the driving member (4) passes through the plug body (31) and is connected to the sealing portion (32), and the air pipe (6) is spirally wrapped around the circumference of the driving member (4).

7. The hermetic sealing bottom valve for a centrifuge according to claim 1, characterized in that: The valve seat (1) is also provided with a feed port (101), the feed port (101) and the discharge port (2) are respectively located at two ends of the valve seat (1), and the inner diameter of the valve seat (1) gradually decreases along the direction from the feed port (101) to the discharge port (2).

8. The hermetic sealing bottom valve for a centrifuge according to claim 7, characterized in that: A feed seat (10) is provided on the valve seat (1), the feed port (101) is opened on the feed seat (10), and the piston (3) is movably provided on the feed seat (10) along the direction from the feed port (101) to the discharge port (2).

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