General knowledge and structure principle of solenoid CSGO¾º²Â selection
The fluid in the pipeline must be consistent with the medium calibrated in the selected solenoid CSGO¾º²Â series.
The temperature of the fluid must be less than the calibration temperature of the selected solenoid CSGO¾º²Â.
The allowable liquid viscosity of solenoid CSGO¾º²Â is generally below 20 CST, which should be noted if it is greater than 20 CST.
ZS, ZCW, ZQDF, ZBSF should be selected when the maximum pressure difference of pipeline is less than 0.04MPa, ZCM series direct acting type and step-by-step direct acting type; when the minimum working pressure difference is greater than 0.04MPa, the pilot type (differential pressure type) solenoid CSGO¾º²Â can be selected; the maximum working pressure difference should be less than the maximum calibration pressure of the solenoid CSGO¾º²Â; generally, the solenoid CSGO¾º²Â is one-way operation, so pay attention to whether there is reverse pressure difference, if there is check CSGO¾º²Â installed.
When the fluid cleanliness is not high, the filter should be installed in front of the solenoid CSGO¾º²Â. Generally, the cleanliness of the medium required by the solenoid CSGO¾º²Â is good.
Pay attention to the diameter of flow aperture and connecting pipe; solenoid CSGO¾º²Â is generally controlled by two position switch; if conditions permit, install bypass pipe to facilitate maintenance; when water hammer occurs, adjust the opening and closing time of solenoid CSGO¾º²Â.
Pay attention to the influence of ambient temperature on solenoid CSGO¾º²Â
The power supply current and consumed power should be selected according to the output capacity. The power supply voltage is generally allowed to be about ¡À 10%. It is necessary to pay attention to the higher VA value during AC starting.
Solenoid CSGO¾º²Â is divided into two types: normally closed and normally open; the normally closed type is generally selected, which is powered on to open and power off to close; however, when the opening time is very long and the closing time is very short, the normally open type should be selected.
Generally speaking, the factory belongs to the type test item. To be exact, there is no professional standard for solenoid CSGO¾º²Â in China. Therefore, the selection of solenoid CSGO¾º²Â manufacturer should be cautious.
In general, select a series of high-speed direct action frequency when the caliber is very short.
General solenoid CSGO¾º²Â is not waterproof, please choose waterproof type when condition is not allowed, our company can make it to order.
The maximum nominal pressure of the solenoid CSGO¾º²Â must exceed the maximum pressure in the pipeline, otherwise the service life will be shortened or other accidents will occur.
All stainless steel type should be selected for corrosive liquid, and ZDF solenoid CSGO¾º²Â should be selected for strong corrosive fluid.
Explosion proof products must be selected for explosive environment.
Many solenoid CSGO¾º²Âs can be used in common use, but the most economical products should be selected on the basis of meeting the above three points.
Structure and principle of solenoid CSGO¾º²Â
1£º Direct acting solenoid CSGO¾º²Â
There are normally closed type and normally open type. When the coil is powered on, electromagnetic force is generated to make the moving iron core absorb with the static iron core to open the CSGO¾º²Â directly, and the medium is a path; when the coil is powered off, the electromagnetic force disappears, the moving iron core is reset under the action of spring force, and the CSGO¾º²Â port is closed directly, so the medium is blocked. It has the advantages of simple structure, reliable action and normal operation under zero pressure difference and micro vacuum. The normally open type is the opposite. For example, the solenoid CSGO¾º²Â with flow diameter less than ¦Õ 6. (Figure 1 is a typical structural diagram)
2¡¢ Step by step direct acting solenoid CSGO¾º²Â
The main and secondary pressure differential CSGO¾º²Â is directly opened by the main and secondary solenoid CSGO¾º²Âs. When the coil is electrified, electromagnetic force is generated to make the moving iron core and the static iron core close. The pilot CSGO¾º²Â port is opened and the pilot CSGO¾º²Â port is set on the main CSGO¾º²Â port, and the moving iron core is connected with the main CSGO¾º²Â core. At this time, the pressure of the upper chamber of the main CSGO¾º²Â is unloaded through the pilot CSGO¾º²Â port. Under the action of pressure difference and electromagnetic force, the main CSGO¾º²Â core moves upward and the main CSGO¾º²Â medium flows. When the coil is powered off, the electromagnetic force disappears. At this time, the moving iron core closes the pilot CSGO¾º²Â hole under the action of self weight and spring force. At this time, the medium enters the upper chamber of the main CSGO¾º²Â core in the balance hole, which makes the pressure of the upper chamber rise. At this time, the main CSGO¾º²Â is closed under the action of spring reset and pressure, and the medium is cut off. The structure is reasonable, the action is reliable, and it works reliably at zero pressure difference. Such as: ZQDF, ZBSF, ZS, ZCW, etc. The second is a typical structural diagram
3¡¢ Indirect pilot solenoid CSGO¾º²Â
This series of solenoid CSGO¾º²Â is composed of pilot CSGO¾º²Â and main CSGO¾º²Â core to form channel combination; normally closed type is closed when it is not powered on. When the coil is energized, the generated magnetic force makes the moving iron core and the static iron core close, and the pilot CSGO¾º²Â port opens, and the medium flows to the outlet. At this time, the pressure in the upper chamber of the main CSGO¾º²Â core decreases, which is lower than the pressure at the inlet side, forming a pressure difference to overcome the spring resistance and then move upward, so as to achieve the purpose of opening the main CSGO¾º²Â port and the medium flows. When the coil is de energized, the magnetic force disappears, and the moving iron core is reset and closed by the spring force. At this time, the medium flows into the balance hole, and the pressure in the upper chamber of the main CSGO¾º²Â core increases, and it moves downward under the action of the spring force to close the main CSGO¾º²Â port. The normally open principle is the opposite. Above caliber, such as CZ, etc. (Figure 3 is a typical structural diagram)