A special coaxial rotating device for a chromatographic valve

Abstract

The present invention relates to a special coaxial rotating device for a chromatographic valve. The coaxial rotating device includes: a hollow housing, the housing includes a first housing and a second housing which are hermetically connected; a rotating support seat is arranged between the adjacent first housing and the second housing; a driving shaft is hermetically and movably arranged inside the first housing, one end of the driving shaft symmetrically extends outwards to be provided with a push shoulder, and the push shoulder is movably inserted on the rotating support seat; one end of the push shoulder is rotatably and radially inserted with a push pin; an output rotating seat is rotatably arranged inside the second housing, and one end thereof is rotatably in surface contact with the rotating support seat; spiral driving chutes are mirror-symmetrically arranged on the circumferential side of the output rotating seat, and one end of the push pin extends into the spiral driving chute. The present invention has a simple structure but can achieve maximum torque output.

Description

Technical Field

[0001] The present invention relates to a special coaxial rotating device for a chromatographic valve. Background Art

[0002] Chromatographic testing refers to using a high performance liquid chromatograph (HPLC) or a gas chromatograph (GC) to qualitatively or quantitatively detect some single or multi-components in a sample to be tested. However, in the existing chromatographic testing process, there is no rotating device with a simple structure and capable of outputting a large enough rotational torque. In view of this, this case is thus born to provide a special coaxial rotating device for a chromatographic valve with a simple structure, small volume and large output torque to solve the above technical problems. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a special coaxial rotating device for a chromatographic valve with a simple structure but capable of achieving maximum torque output.

[0004] The technical solution of the present invention is as follows: A special coaxial rotating device for a chromatographic valve, the coaxial rotating device comprising:

[0005] A hollow housing, the housing comprising a first housing and a second housing which are hermetically connected; a rotating support seat is provided between the adjacent first housing and the second housing;

[0006] A driving shaft, which is hermetically and movably arranged inside the first housing, one end of the driving shaft symmetrically extends outwards to be provided with a thrust shoulder, and the thrust shoulder is movably inserted on the rotating support seat; one end of the thrust shoulder is rotatably and radially inserted with a push pin;

[0007] An output rotating seat, which is rotatably arranged inside the second housing, and one end thereof is rotatably in surface contact with the rotating support seat; spiral driving chutes are mirror-symmetrically arranged on the circumferential side of the output rotating seat, and one end of the push pin extends into the spiral driving chute;

[0008] Wherein: when the pressure in the sealed cavity between the driving shaft and the first housing increases, the driving shaft is driven to move along the axis of the output rotating seat, and at the same time, the push pin is driven to rotate in the mirror-symmetrically arranged spiral driving chute, thereby driving the output rotating seat to rotate back and forth.

[0009] Further, a horseshoe-shaped guiding chute is arranged parallel to the axis inside the second housing, and the other end of the push pin is movably inserted inside the guiding chute.

[0010] Further, a deformation part is fixedly arranged on the guiding chute; the deformation part deforms inwards under the action of an external electric field or magnetic field to squeeze and push the push pin to move; the deformation part and the guiding chute are arranged at an angle α, 0.5° < α < 1°.

[0011] Furthermore, the deformation part includes, from the inside to the outside, an insulating resin sheet layer and a deformation sheet layer that are tightly bonded in sequence; the deformation sheet layer is a piezoelectric sensitive material with a radially variable thickness. A power supply circuit supplies power to the deformation sheet layer. Under the inverse piezoelectric effect, the deformation sheet layer contracts and deforms to push the push rod towards the end of the guiding chute.

[0012] Furthermore, an elastic member is provided between the output rotating seat and the second housing to provide radial support and positioning guidance when the output rotating seat rotates.

[0013] Furthermore, the elastic member is a plurality of springs, and the plurality of springs are stacked by ultrasonic welding or gluing.

[0014] Furthermore, the output rotating seat includes a rotating shaft and a shaft seat that are integrally formed; the rotating shaft and the shaft seat are coaxially arranged; a concave rotating groove is provided at the connection between the rotating shaft and the shaft seat; a first thrust ball bearing is detachably installed in the rotating groove; a cavity is provided between the rotating shaft and the shaft seat; a through hole is provided radially outside the cavity.

[0015] Furthermore, a sealing ring groove is provided at one end of the rotating shaft, and a first sealing ring is sleeved on the sealing ring groove for sliding sealing with the second housing; a plug-in portion is provided at the other end of the rotating shaft; a second thrust ball bearing is detachably provided on the plug-in portion.

[0016] Furthermore, arc-shaped convex portions extending radially outward are mirror-symmetrically provided on the periphery of the rotating support seat, and a first groove adapted to the guiding chute is provided inside the arc-shaped convex portions; through holes are circumferentially and arrayedly provided on the rotating support seat; a second thrust ball bearing mounting seat is provided on the rotating support seat.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The present invention completely isolates the upper and lower chambers in the entire coaxial rotating device, has good airtightness, and the rotating shaft part is also used as a chamber to maximize utilization, so as to ensure the maximum torque output, which is sufficient to meet the torque required for switching during the use of gas chromatography.

[0019] 2) The spiral drive groove of the rotating shaft of the present invention is far from the center of the rotating shaft, maximizing the torque, and the same pressure acts on the output to maximize the rotational force.

[0020] 3) The two push rods (also sliding pins) of the present invention can position the housing and the drive shaft, allowing them to move only up and down, and more stably convert the up and down forces into rotational torque through the spiral groove of the rotating body. In this way, the entire solution has the simplest structure and achieves the maximum torque output.

[0021] 4) The present invention utilizes the magnetostrictive principle or the inverse piezoelectric effect, and uses the current, a simple and controllable power source, to perform fast, precise, and controllable propulsion, which can ensure the rotation angle of the entire output rotating seat.

[0022] 5) In the present invention, multiple springs are stacked at intervals, effectively reducing the stress of each layer of springs, avoiding spring breakage, effectively increasing the radial stiffness, providing radial support and positioning guidance for the output rotating seat, and avoiding reliability risks such as polarization during the operation of the output rotating seat, friction with the inner wall of the row cavity, and generation of noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To further illustrate the embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0024] Figure 1 is the front view of the coaxial rotating device dedicated to the chromatographic valve of the present invention;

[0025] Figure 2 is the exploded view of the coaxial rotating device dedicated to the chromatographic valve of the present invention;

[0026] Figure 3 is the three-dimensional structure schematic diagram of the output rotating seat of the coaxial rotating device dedicated to the chromatographic valve of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] To enable those skilled in the art of the present technology to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0029] See Figures 1 to 3 As shown, a coaxial rotating device dedicated to a chromatographic valve, the coaxial rotating device includes: a hollow housing 1 、A drive shaft 2 and an output rotating seat 3. Among them: The housing 1 includes a first housing 11 and a second housing 12 that are hermetically connected; a rotating support seat 13 is provided between the adjacent first housing 11 and the second housing 12; the drive shaft 2 is hermetically and movably arranged inside the first housing 11, and a thrust shoulder 21 is symmetrically extended outward at one end of the drive shaft 2, and the thrust shoulder 21 is movably inserted on the rotating support seat 13; a push pin 22 is rotatably and radially inserted at one end of the thrust shoulder 21; the output rotating seat 3 is rotatably arranged inside the second housing 12, and one end is rotatably in surface contact with the rotating support seat 13; spiral drive chutes 31 are mirror-symmetrically arranged on the circumferential side of the output rotating seat 3, and one end of the push pin 22 extends into the spiral drive chute 31; specifically: when the pressure in the sealed cavity between the drive shaft 2 and the first housing 11 increases, the drive shaft 2 is driven to move along the axis of the output rotating seat 3, and at the same time, the push pin 22 is driven to rotate in the mirror-symmetrically arranged spiral drive chute 31, thereby driving the output rotating seat 3 to rotate back and forth. In this embodiment, the entire coaxial rotating device is isolated by the first housing 11 and the second housing 12, that is, the upper and lower chambers are completely isolated, having good airtightness, and the rotating shaft part is also used as a chamber to make the maximum utilization, so that the maximum torque output can be guaranteed, which is sufficient to meet the torque required for the switching during the use of the gas chromatograph. In addition, the spiral drive groove of the rotating shaft is far from the center of the rotating shaft, maximizing the torque, and the same pressure acts on the output to maximize the rotating force.

[0030] On the basis of the above embodiment, a horseshoe-shaped guide chute 121 is arranged parallel to the axis inside the second housing 12, and the other end of the push pin 22 is movably inserted inside the guide chute 121 for keeping the entire drive shaft 2 moving back and forth in the vertical direction all the time.

[0031] On the basis of the above embodiment, a deformation part 122 is fixed on the guide chute 121; the deformation part 122 deforms inward under the action of an external electric field or magnetic field to squeeze and push the push pin 22 to move; the deformation part 122 and the guide chute 121 are arranged at an angle α, 0.5° < α < 1°.

[0032] On the basis of the above embodiment, the deformation part 122 includes an insulating resin sheet layer and a deformation sheet layer that are tightly bonded in sequence from the inside to the outside; the deformation sheet layer is a piezoelectric sensitive material with a radially variable thickness for supplying power to the deformation sheet layer. Under the inverse piezoelectric effect, the deformation sheet layer contracts and deforms to push the push pin towards the end of the guide chute. In this embodiment, when the external sensor detects that the transmission has not reached the specified angle, the deformation part 122 starts to supply power automatically, that is, by using the magnetostrictive principle or the inverse piezoelectric effect, and using the simple and controllable power of the current to perform fast, accurate, and controllable pushing, which can ensure the angle of rotation of the entire output rotating seat.

[0033] Based on the above embodiments, an elastic member 4 is provided between the output rotating seat 3 and the second housing 12, which is used to provide radial support and positioning guidance when the output rotating seat rotates, effectively ensuring that the output rotating seat 3 always maintains coaxiality with the second housing 12 during the rotation process, preventing tilting caused by uneven local stress, thereby affecting the accuracy of the switching selection angle, and also avoiding wear of the output rotating seat 3 due to friction, effectively improving the service life.

[0034] Based on the above embodiments, the elastic member 4 is a plurality of springs, and the plurality of springs are ultrasonically welded or stacked by gluing. In this embodiment, by stacking a plurality of springs at intervals, the stress of each layer of springs is effectively reduced, avoiding spring fracture, effectively increasing the radial stiffness, providing radial support and positioning guidance for the output rotating seat, and avoiding reliability risks such as polarization of the output rotating seat during operation and friction with the inner wall of the row cavity and generation of noise.

[0035] Based on the above embodiments, the output rotating seat includes an integrally formed rotating shaft 32 and a shaft seat 33; the rotating shaft 32 and the shaft seat 33 are coaxially arranged; a concave rotary groove 331 is provided at the connection of the rotating shaft 32 and the shaft seat 33; a first thrust ball bearing 332 is detachably installed in the rotary groove 331; a cavity 333 is provided between the rotating shaft 32 and the shaft seat 33; a through hole 334 is provided radially outside the cavity 333.

[0036] Based on the above embodiments, one end of the rotating shaft 32 is provided with a sealing ring groove, and a first sealing ring 321 (preferably fluororubber) is sleeved on the sealing ring groove, which is used for sliding sealing with the second housing 12, so as to ensure that when both the valve and the special coaxial rotating device for the chromatographic valve are used in a 200-degree heating chamber, it can still withstand a high temperature of 250 degrees without failure, effectively improving the use performance; the other end of the rotating shaft 32 is provided with a plug-in portion 322; a second thrust ball bearing is detachably provided on the plug-in portion 322.

[0037] Based on the above embodiments, arc-shaped protrusions 131 extending radially outward are mirror-symmetrically provided on the circumferential side of the rotating support seat 13, and a first groove 132 adapted to the guiding chute is provided inside the arc-shaped protrusions 131; through holes 133 are circumferentially and arrayedly provided on the rotating support seat 13; a second thrust ball bearing mounting seat is provided on the rotating support seat.

[0038] In summary, the present invention has a simple structure but can achieve maximum torque output, effectively solving the problem that there is no rotating device with a simple structure and capable of outputting a large enough rotating torque in the existing chromatographic test process.

[0039] The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present invention.

Claims

1. A special coaxial rotating device for a chromatographic valve, characterized in that: The coaxial rotating device includes: A hollow housing (1), the housing (1) includes a first housing (11) and a second housing (12) which are hermetically connected; a rotating support base (13) is provided between the adjacent first housing (11) and the second housing (12); A driving shaft (2), movably arranged inside the first housing (11), one end of the driving shaft (2) symmetrically extends outwardly with a push shoulder (21), and the push shoulder (21) is movably inserted on the rotating support base (13); one end of the push shoulder (21) rotatably and radially inserts a push pin (22); An output rotating seat (3), the output rotating seat (3) is rotatably arranged inside the second housing (12), and one end is rotatably in surface contact with the rotating support base (13); spiral driving chutes (31) are mirror - symmetrically arranged on the circumferential side of the output rotating seat (3), and one end of the push pin (22) extends into the spiral driving chute (31); Wherein: when the pressure in the sealed cavity between the driving shaft (2) and the first housing (11) increases, the driving shaft (2) is driven to move along the axis of the output rotating seat (3), and at the same time, the push pin (22) is driven to rotate in the mirror - symmetrically arranged spiral driving chute (31), thereby driving the output rotating seat (3) to rotate back and forth; A horseshoe - shaped guiding chute (121) is arranged parallel to the axis inside the second housing (12), and the other end of the push pin (22) is movably inserted inside the guiding chute (121); A deformation part (122) is fixed on the guiding chute (121); the deformation part (122) deforms inwardly under the action of an external electric field or magnetic field to push the push pin (22) to move; the deformation part (122) and the guiding chute (121) are arranged at an angle α, 0.5° < α < 1°; The output rotating seat includes an integrally formed rotating shaft (32) and a shaft seat (33); the rotating shaft (32) and the shaft seat (33) are coaxially arranged; a concave rotating groove (331) is provided at the connection of the rotating shaft (32) and the shaft seat (33); a first thrust ball bearing (332) is detachably installed in the rotating groove (331); a cavity (333) is provided between the rotating shaft (32) and the shaft seat (33); a through - hole (334) is provided radially outside the cavity (333).

2. The coaxial rotating device dedicated to a chromatographic valve according to claim 1, characterized in that: The deformation part (122) includes an insulating resin sheet layer and a deformation sheet layer which are tightly bonded in sequence from inside to outside; the deformation sheet layer is a piezoelectric - sensitive material with a radially - variable thickness, and a power supply circuit supplies power to the deformation sheet layer. Under the inverse piezoelectric effect, the deformation sheet layer contracts and deforms to push the push pin towards the end of the guiding chute.

3. The coaxial rotating device dedicated to a chromatographic valve according to claim 1, characterized in that: An elastic member (4) is provided between the output rotating seat (3) and the second housing (12) for providing radial support and positioning guidance when the output rotating seat rotates.

4. The coaxial rotating device special for a chromatographic valve according to claim 3, characterized in that: The elastic member (4) is a plurality of springs, and the plurality of springs are ultrasonically welded or laminated by gluing.

5. The coaxial rotating device special for a chromatographic valve according to claim 1, characterized in that: One end of the rotating shaft (32) is provided with a sealing ring groove, on which a first sealing ring (321) is sleeved for sliding sealing with the second housing (12); the other end of the rotating shaft (32) is provided with a plug-in portion (322); a second thrust ball bearing is detachably arranged on the plug-in portion (322).

6. The coaxial rotating device special for a chromatographic valve according to claim 1, wherein: Arc-shaped convex portions (131) extending radially outwards are mirror-symmetrically arranged on the circumferential side of the rotary support base (13), and a first groove (132) adapted to the guiding sliding groove is arranged inside the arc-shaped convex portions (131); through holes (133) are arranged in a circumferential array on the rotary support base (13); a second thrust ball bearing mounting seat is arranged on the rotary support base.

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