Tianjin Heng Connaught Technology Development Co. Ltd. is a professional engaged in the import of electronic hydraulic product sales and complete hydraulic system agent and sales of high-tech enterprises. The company is engaged in hydraulic parts industry for many years, in order to shorten delivery time, with a large number of Germany REXROTH ( Rexroth ), the United States PARKER ( group G), Japan SMC, FESTO FESTO, CKD CKD, Koganei Koganei, NORGREN Norgren, hydraulic products.
Due to the structure set emission limits, gear pump that usually only can be used as a constant flow hydraulic source. However, annex into the thread connection valve combination scheme to improve its functions, reducing system cost and improving system reliability is effective, therefore, high-pressure plunger pump performance of the gear pump accessible expensive, complex. For example, installed directly on the pump control valves, pumps can be avoided between the pipe and the direction, so as to control the cost. Fewer tubes and connecting pieces of leakage can be reduced, so as to improve the working reliability. Install the valve and pump itself can reduce the pressure of the circulating loop, to improve its performance. Here are some basic functions can improve the gear pump circuit, some of which are proved feasible basic circuit, and some are innovative research. Unloading circuit: uninstall components will be combined in the large flow pump and small power single pump. Two liquid from the pump discharge outlet, to reach a predetermined pressure and ( or ) flow. At this time, large flow pump to flow from the entrance to the export cycle, thus reducing the output of the pump flow rate on the system, the magnetic power soon reduced to slightly higher than the value of high pressure required. Ratio flow to lower the percentage depends on this not unloading capacity total emission, or a combination of screw thread unloading valve to reduce or even eliminate the pipeline, channels and accessories, and other possible leak. The most simple uninstall components by artificial manipulation. Unloading valve spring to turn on or off, when a control signal to the valve, the valve is switched-off state is good. A lever or other mechanical mechanism is the most simple way to manipulate the valve.
Pilot ( pneumatic or hydraulic ) unloading valve is an improved control method, because of this valve can be controlled remotely. Its progress is the greatest use of electrical or electronic controlled solenoid valve off, it not only can be used for remote control, automatic control and computer available, usually that simple unloading technology is the application of the best. Artificial manipulation uninstall components used for fast operation and high flow and fast operation and high flow and for precise control and reduce the flow of the loop, such as rapid telescopic boom loop. Pressure sensing unloading is the most common solution. The action of the spring to make the unloading valve is in its large flow position. Pressure relief valve circuit to achieve pre-set value, the relief valve opens, the unloading valve in hydraulic and under the effect of switching to the small flow position. Pressure sensing unloading valve is basically a system pressure discharge automatically unloaded components, commonly used to measure Chengyi division and hydraulic vise.
Flow sensing circuit unloaded unloading valve is pressed by a spring to its high flow position. The fixed valve orifice size of the engine at optimum speed equipment to determine the required flow. If the engine speed beyond the best range, the throttle hole pressure drop will increase, thereby shifting the unloading valve to the small flow position (right ). So large flow pump adjacent components can be made of the size of the maximum flow throttle, so circuit energy consumption, smooth and low cost. The typical application circuit is defined, loop flow rate of the optimal range in order to improve the performance of the whole system, or limited to the machine during high-speed circuit pressure. Commonly used in the garbage trucks carrying. Pressure flow sensing circuit unloaded unloading valve is pressed by a spring to the large flow position, whether it reaches a predetermined pressure or flow, will be unloaded. The equipment can complete the high-pressure work or work in the idling speed. This feature reduces unnecessary traffic, thus reducing the power required. Because of this circuit has a wide range of load and speed, it is often used for mining equipment. Rexroth has the power of the pressure sensor integrated circuit uninstall components pressure sensing unloading pump, which consists of two minor changes, two sets of pump driven by the same prime mover, each magnetic accept another unloading pump uninstall guide and control signal. Our approach this sensor called interactive sensor, it can make a group of pump to work under high pressure pump and the other large flow of work. Two relief valve pressure can be adjusted for each loop is special, so that one or two pumps uninstall.
This scheme reduces power requirements, we can use small capacity and low price. As shown in the loading and unloading sensing circuit. When the control valve control valve without load sensing signal, pump all the flow through a valve 1, valve 2 row back to the tank; when the control valve applied load sensing signal, to pump circuit for liquid; when the pump output pressure over load sensing valve pressure a predetermined value, the pump provides only work flow to loop, and excess flow valve throttle position through the bypass 2 oil return tank. Compared with a gear pump with the Rexroth plunger pump load sensor, has the advantages of low cost, the advantages of strong anti-pollution ability and low maintenance requirements.
The article explains:
1, this is the network editor reproduced or the release, the release of the article aims to convey more information to visitors.
2, involves the content of the works, copyright and other issues, please contact with the network in 30 days, we will make the appropriate treatment for the first time! The relevant copyright matters please contact: 13515194999
3, this article please indicate are from: Jiangyin OuLeiShi valve valve repair factory www.olschina.com
4 other links:
Valve repair valve repair valve repair equipment valve grinding machine import valve repair valve repair valve repair
|
