1. Technical Field
The present disclosure generally relates to control valves, and particularly to a pneumatic control valve and a pneumatic control system using the pneumatic control valve.
2. Description of Related Art
Pneumatic control systems are widely applied in many fields such as air pressure equipment, to control the direction of gas flow. A commonly used pneumatic control system includes a pneumatic control valve and a manual control valve; the manual control valve is to control the pneumatic control valve to turn the direction of gas flow. However, it is generally not safe for an operator to operate the manual control valve to control the pneumatic control valve by one hand. In addition, the commonly used pneumatic control valve has a poor structure and is prone to operate accidentally due to unintended accidental operation, thereby generating a potential safety hazard to the operator.
Therefore, there is room for improvement in the art.
The components in the drawings are not necessarily drawn to scale, the emphasis instead placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
In the illustrated embodiment, the fastening tube 70, the pushing block 50 and the rotating block 60 are all substantially cylindrical. The fastening tube 70 axially forms three guiding ribs 18 evenly positioned on the inner surface of the fastening tube 70. Each of the guiding ribs 18 forms an inclined surface 182 at a distal end thereof adjacent to the second valve body 20. The pushing block 50 axially defines three guiding grooves 51 in the pushing block 50 corresponding to the three guiding ribs 18 of the fastening tube 70 and forms three inclined surfaces 53 at an end of the pushing block 50 adjacent to the rotating block 60. The rotating block 60 also axially defines three sliding grooves 61 in the outer surface of the rotating block 60 corresponding to the three guiding ribs 18. The rotating block 60 also defines three pairs of spiral surfaces at an end of the rotating block 60 adjacent to the pushing block 50. Each pair of the spiral surfaces is located between two sliding grooves 61. In the illustrated embodiment, each pair of spiral surfaces includes a first spiral surface 63 and a second spiral surface 65 adjacent to the first spiral surface 63.
Referring to
The end cover 40 is a substantially rectangular plate. In the illustrated embodiment, the end cover 40 is fastened to an end of the second valve body 20 away from the first valve body 10 via two fastening members 11.
In assembly of the pneumatic control valve 100, the fastening tube 70 is fastened in the receiving hole 16, and the pushing block 50 and the rotating block 60 are slidably received in the fastening tube 70. A portion of each of the three guiding ribs 18 is received in one of the corresponding sliding grooves 61, and the remaining portion of each of the three guiding ribs 18 is received in one of the corresponding guiding grooves 51. The three inclined surfaces 53 contact the three first spiral surfaces 63, respectively. The piston rod 31 is slidably received in the second valve body 20, the end cover 40 is fastened at an end of the second valve body 20 away from the first valve body 10, and an end of the piston rod 31 resists with an end of the rotating block 60, and the other end of the piston rod 31 is fastened to the end cover 40 via the elastic member 90.
When a momentary compressed air is flowed or injected into the pneumatic control valve 100 via the first gas inlet 15 again, the momentary injected compressed air drives the pushing block 50 to move towards the end cover 40, the pushing block 50 drives the rotating block 60 to move towards the end cover 40 linearly until each of the three guiding ribs 18 contact one corresponding second spiral surface 65 to drive the rotating block 60 to rotate until each of the three inclined surfaces 53 contact one corresponding first spiral surface 63 and each of the three guiding ribs 18 slide into one corresponding sliding groove 61. At this time, the elastic force of the elastic member 90 drives the piston rod 31 to move towards the first gas inlet 15, the piston rod 31 drives the rotating block 60 to move towards the first gas inlet 15 along the guiding ribs 18 until the pneumatic control valve 100 returns to the initial state.
In an alternative embodiment, the fastening tube 70 is omitted, and the three guiding ribs 18 are formed in the inner surface of the first valve body 10.
It should be noted that the number of the guiding ribs 18 may be two or more, and the number of the guiding grooves 51 or the sliding grooves 61 is the same as the number of the guiding ribs 18.
The pneumatic control valve 100 only requires a momentary burst of compressed air to flow into the first gas inlet 15 to drive the piston rod 31 to move to selectively communicate the second gas inlet 22 with the first gas outlet 23a or the second gas outlet 23b, and the working state of the pneumatic control valve 100 can be easily changed by the momentary burst of compressed air operating in one direction. It is convenient and safe for the operator to operate the pneumatic control valve 100 to control a compressed air source connected to the second gas inlet 22 to drive the pneumatic mechanisms connected to the pneumatic control valve 100 to work.
While the present disclosure has been described with reference to particular embodiments, the description is illustrative of the disclosure and is not to be construed as limiting the disclosure. Therefore, various modifications can be made to the embodiments by those of ordinary skill in the art without departing from the true spirit and scope of the disclosure, as defined by the appended claims.
Number | Date | Country | Kind |
---|---|---|---|
2011 1 0413123 | Dec 2011 | CN | national |
Number | Name | Date | Kind |
---|---|---|---|
3220695 | Jones et al. | Nov 1965 | A |
3618636 | Grimland et al. | Nov 1971 | A |
3735771 | Panissidi | May 1973 | A |
3790125 | Swatty | Feb 1974 | A |
4372193 | Hall | Feb 1983 | A |
4383477 | Nilsson et al. | May 1983 | A |
4580590 | Brinkel et al. | Apr 1986 | A |
4632361 | Callison | Dec 1986 | A |
5628490 | Roberts et al. | May 1997 | A |
6047949 | Beauchemin, Jr. | Apr 2000 | A |
6276659 | Wang | Aug 2001 | B1 |
6595104 | Pinciaro | Jul 2003 | B2 |
8028356 | Kao et al. | Oct 2011 | B2 |
8413673 | Sacchetti | Apr 2013 | B2 |
8561640 | McConnell et al. | Oct 2013 | B2 |
8573558 | Wang | Nov 2013 | B2 |
20070113906 | Sturman et al. | May 2007 | A1 |
20070170679 | Stender et al. | Jul 2007 | A1 |
20120080633 | Xu | Apr 2012 | A1 |
Number | Date | Country |
---|---|---|
2828478 | Oct 2006 | CN |
202017792 | Oct 2011 | CN |
Number | Date | Country | |
---|---|---|---|
20130146165 A1 | Jun 2013 | US |