Guide vane actuating mechanism and compressor

Abstract

The guide vane executing mechanism comprises a controller, a gas channel, a positioner, a switching valve and an electromagnetic valve, the gas channel comprises a first section and a second section, the first section and the second section communicate with a gas source, and the positioner comprises an input end, an output end and a double-acting air cylinder; the input end, the output end, the switching valve and the double-acting air cylinder are arranged on the first section, the switching valve is used for controlling on-off of the first section and connected with an air source through the second section, and the electromagnetic valve is arranged on the second section and used for controlling on-off of the second section so as to open or close the switching valve. The controller is respectively connected with the signal input device and the electromagnetic valve, so that the position of the guide vane can be kept, the condition that the guide vane is fully closed or fully opened when the guide vane actuating mechanism loses an air source or loses a signal is avoided, the damage to a process pipeline and a compressor is avoided, and the increase of maintenance cost and the reduction of production efficiency caused by the damage are further avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of compressors, and in particular relates to a guide vane actuator and a compressor. Background Art

[0002] Guide vanes are usually provided at the inlet of the compressor. By adjusting the position of the guide vanes, the flow rate of the gas entering the compressor can be adjusted, the process gas can be throttled, and the flow rate and pressure of the gas at the compressor outlet can be controlled.

[0003] In the prior art, the position of the guide vane is controlled by installing a guide vane actuator on the guide vane, but most of the existing guide vane actuators do not have a position retention function. When the guide vane actuator loses its air source or signal, the guide vane will be fully closed or fully opened, which may cause damage to the process pipeline and the compressor, resulting in increased maintenance costs and reduced production efficiency. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present application is to provide a guide vane actuator and a compressor, which can have a position retention function when the air source or signal is lost.

[0005] In order to solve the above problems, the present application provides a guide vane actuator, including a controller, a gas channel, a positioner, a switching valve and a solenoid valve, the gas channel including a first section and a second section, the first section and the second section are respectively connected to a gas source, the positioner includes an input end, an output end and a double-acting cylinder, the input end, the output end, the switching valve and the double-acting cylinder are arranged on the first section, the switching valve is used to control the on and off of the first section, the switching valve is connected to the gas source through the second section, the solenoid valve is arranged on the second section, the solenoid valve is used to control the on and off of the second section to open or close the switching valve, and the controller is respectively connected to a signal input device and the solenoid valve.

[0006] Optionally, the controller is connected to the positioner.

[0007] Optionally, the guide vane actuator includes an operating condition. When in the operating condition, the controller controls the solenoid valve to open based on the comparison result of the input signal of the signal input device with a preset signal interval, so that part of the gas discharged from the gas source flows into the switching valve through the second section to open the switching valve; part of the gas discharged from the gas source flows through the first section in sequence through the input end, the output end and the switching valve and flows into the double-acting cylinder.

[0008] Optionally, the controller includes a first terminal group and a second terminal group, the first terminal group is connected to the signal input device, and the second terminal group is connected to the solenoid valve;

[0009] The controller is used to compare the input signal with the preset signal interval, and control the solenoid valve to open when the input signal is within the preset signal interval.

[0010] Optionally, the guide vane actuator includes a signal-lost position holding condition. When in the signal-lost position holding condition, the controller controls the solenoid valve to close based on the comparison result of the input signal of the signal input device with a preset signal interval to block the second section, so as to close the switching valve to block the gas on the downstream side of the switching valve in the first section from flowing back to the upstream side of the switching valve.

[0011] Optionally, the controller includes a first terminal group and a second terminal group, the first terminal group is connected to the signal input device, and the second terminal group is connected to the solenoid valve;

[0012] The controller is used to compare the input signal with the preset signal interval, and control the solenoid valve to close when the input signal is outside the preset signal interval.

[0013] Optionally, the guide vane actuator includes a loss of air position retention condition. When in the loss of air position retention condition, the air pressure in the second section is reduced to close the switching valve to block the gas on the downstream side of the switching valve in the first section from flowing back to the upstream side of the switching valve.

[0014] Optionally, the switching valve includes an actuator, which is arranged on the first section and the second section. When the air pressure in the second section is greater than or equal to a preset pressure threshold of the actuator, the gas in the second section drives the actuator to move out of the first section to connect the first section; when the air pressure in the second section is less than the preset pressure threshold of the actuator, the actuator resets to the first section to block the first section.

[0015] Optionally, the gas channel further includes a main section, the first section and the second section are respectively connected to the main section, and are connected to the gas source through the main section, and the main section is provided with a pressure reducing valve and a filter.

[0016] In another aspect of the present application, a compressor is provided, comprising the guide vane actuator as described above.

[0017] Beneficial Effects

[0018] A guide vane actuator and a compressor provided in an embodiment of the utility model provide two different flow paths for gas by setting a gas channel and making the gas channel include a first section and a second section. By setting a solenoid valve and a switching valve on the second section, the solenoid valve can connect the gas source with the switching valve when it is opened, so that the gas discharged from the gas source can flow to the switching valve through the second section and open the switching valve. Since the switching valve is opened, the gas discharged from the gas source can flow to the double-acting cylinder after passing through the input end, the output end and the switching valve of the positioner on the first section in sequence, driving the double-acting cylinder to move, so as to adjust the guide vane position and realize throttling control of the process gas. By setting a controller and connecting the controller to the signal input device and the solenoid valve respectively, the solenoid valve can be controlled to close when the signal is lost, so as to disconnect the connection between the gas source and the switching valve, so that the switching valve is cut off and closed. After the switching valve is cut off and closed, the connection of the first section is disconnected, which can block the gas on the downstream side of the switching valve in the first section from flowing back to the upstream side of the switching valve, thereby keeping the pressure on the downstream side of the switching valve in the first section unchanged, so that the double-acting cylinder remains stationary, and the position retention of the guide vane is realized. When the gas source is cut off, no gas will flow from the gas source into the second section, causing the switching valve to shut down. After the switching valve shuts down, the connection with the first section is disconnected, which can block the gas on the downstream side of the switching valve in the first section from flowing back to the upstream side of the switching valve, thereby maintaining the pressure on the downstream side of the switching valve in the first section unchanged, keeping the double-acting cylinder stationary, and achieving the position retention of the guide vane. This prevents the guide vane from being fully closed or fully opened when the guide vane actuator loses the gas source or signal, avoids damage to the process pipeline and compressor, and thus avoids the increase in maintenance costs and the reduction in production efficiency due to damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a system flow chart of the guide vane actuator according to an embodiment of the present application.

[0020] The reference numerals are as follows:

[0021] 1. Controller; 2. Positioner; 21. Input end; 22. Output end; 23. Double-acting cylinder; 3. Switching valve; 4. Solenoid valve; 51. First section; 52. Second section; 53. Main section; 6. Pressure reducing valve; 7. Air source; 8. Signal input device. DETAILED DESCRIPTION

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] See also Figure 1 As shown, according to an embodiment of the present application, a guide vane actuator is provided, including a controller 1, a gas channel, a positioner 2, a switching valve 3 and a solenoid valve 4, the gas channel includes a first section 51 and a second section 52, the first section 51 and the second section 52 are respectively connected to the gas source 7, the positioner 2 includes an input end 21, an output end 22 and a double-acting cylinder 23, the input end 21, the output end 22, the switching valve 3 and the double-acting cylinder 23 are arranged on the first section 51, the switching valve 3 is used to control the on-off of the first section 51, the switching valve 3 is connected to the gas source 7 through the second section 52, the solenoid valve 4 is arranged on the second section 52, the solenoid valve 4 is used to control the on-off of the second section 52 to open or close the switching valve 3, and the controller 1 is respectively connected to the signal input device 8 and the solenoid valve 4.

[0027] By setting a gas channel and making the gas channel include a first section 51 and a second section 52, two different flow paths are provided for the gas. By setting a solenoid valve 4 and a switching valve 3 on the second section 52, the solenoid valve 4 can connect the gas source 7 with the switching valve 3 when it is opened, so that the gas discharged from the gas source 7 can flow to the switching valve 3 through the second section 52 and open the switching valve 3. Since the switching valve 3 is opened, the gas discharged from the gas source 7 can flow through the input end 21, the output end 22 and the switching valve 3 of the positioner 2 on the first section 51 in sequence and then flow to the double-acting cylinder 23, driving the double-acting cylinder 23 to move, so as to adjust the guide vane position and realize throttling control of the process gas. By setting a controller 1 and connecting the controller 1 to the signal input device 8 and the solenoid valve 4 respectively, the solenoid valve 4 can be controlled to close when the signal is lost, so as to disconnect the connection between the gas source 7 and the switching valve 3, so that the switching valve 3 is cut off and closed. After the switching valve 3 is shut off, the connection of the first section 51 is disconnected, which can block the gas on the downstream side of the switching valve 3 in the first section 51 from flowing back to the upstream side of the switching valve 3, thereby maintaining the pressure on the downstream side of the switching valve 3 in the first section 51 unchanged, so that the double-acting cylinder 23 remains stationary, and the guide vane is retained in place. When the gas source 7 is shut off, no gas flows from the gas source 7 into the second section 52, so that the switching valve 3 is shut off. After the switching valve 3 is shut off, the connection of the first section 51 is disconnected, which can block the gas on the downstream side of the switching valve 3 in the first section 51 from flowing back to the upstream side of the switching valve 3, thereby maintaining the pressure on the downstream side of the switching valve 3 in the first section 51 unchanged, so that the double-acting cylinder 23 remains stationary, and the guide vane is retained in place. When the guide vane actuator loses the gas source 7 or loses the signal, the guide vane is prevented from being fully closed or fully opened, and damage to the process pipeline and the compressor is avoided, thereby avoiding the increase in maintenance costs and the reduction in production efficiency caused by damage.

[0028] The gas source 7, the solenoid valve 4, the switching valve 3 and the positioner 2 can be connected by a connecting pipe, and the connecting pipe and the gas-permeable parts of the solenoid valve 4, the switching valve 3 and the positioner 2 together form a gas channel.

[0029] Among them, the positioner 2 is arranged on the guide vane actuator, and the double-acting cylinder 23 of the positioner 2 drives the guide vane actuator to move, and then drives the guide vane to rotate, so as to adjust the gas flow entering the compressor.

[0030] The first section 51 is mainly used to introduce the gas discharged from the gas source 7 into the double-acting cylinder 23, thereby driving the double-acting cylinder 23 to move.

[0031] The second section 52 is mainly used to introduce the gas discharged from the gas source 7 into the switching valve 3 , thereby opening the switching valve 3 .

[0032] Specifically, when the gas pressure in the second section 52 reaches the opening pressure of the switching valve 3, the switching valve 3 is opened, and when the gas pressure in the second section 52 is less than the opening pressure of the switching valve 3, the switching valve 3 is closed. When the switching valve 3 is opened, the first section 51 is connected, so that the gas discharged from the gas source 7 can flow through the input end 21, the output end 22 and the switching valve 3 in sequence and enter the double-acting cylinder 23. When the switching valve 3 is closed, the first section 51 is blocked, and the gas discharged from the gas source 7 is cut off at the switching valve 3 and cannot flow to the downstream side of the switching valve 3, and the gas on the downstream side of the switching valve 3 cannot flow back to the upstream side of the switching valve 3.

[0033] The input end 21 , the output end 22 , the switching valve 3 and the double-acting cylinder 23 are sequentially arranged on the gas flow path of the first section 51 along the flow direction.

[0034] The controller 1 is electrically connected to the signal input device 8 and the solenoid valve 4 , respectively, and the controller 1 controls the switch of the solenoid valve 4 based on the electrical signal input by the signal input device 8 .

[0035] It should be noted that the controller 1 controls the switch of the solenoid valve 4 based on the electrical signal input by the signal input device 8, which is a conventional technology in the field and a conventional usage of the controller 1 and the solenoid valve 4, and will not be elaborated here.

[0036] The controller 1 is connected to the positioner 2 , so that the controller 1 can control the action of the positioner 2 according to the electrical signal input by the signal input device 8 .

[0037] Among them, the controller 1 is a programmable controller 1.

[0038] The signal input device 8 may be an on-site position measurement device, which is used to measure the guide vane position or to obtain position feedback on the positioner 2 .

[0039] Specifically, the position signal is converted into an analog current signal of 4 to 20 mA through the on-site position measurement device and sent to the analog / digital conversion unit of the programmable controller 1. After conversion, the corresponding position value is displayed on the screen of the programmable controller 1, and the desired angle is set through the corresponding performance adjustment module of the programmable controller 1. The analog current signal of 4 to 20 mA output by the programmable controller 1 is sent to the positioner 2. The position change of the double-acting cylinder 23 in the positioner 2 is controlled by the size of the current. The opening of the guide vane is adjusted by the position change of the double-acting cylinder 23 to realize the flow and pressure control function of the compressor.

[0040] More specifically, the controller 1 may include an SSC-24 type signal comparator. The SSC-24 type signal comparator includes a first terminal group, a second terminal group, a third terminal group, and a fourth terminal group. The first terminal group is connected to the signal input device 8, the second terminal group is connected to the solenoid valve 4, the third terminal group is connected to the positioner 2, and the fourth terminal group is connected to the 24V power supply.

[0041] The guide vane actuator includes an operating condition. When in the operating condition, the controller 1 controls the solenoid valve 4 to open based on the comparison result of the input signal of the signal input device 8 and the preset signal interval, so that part of the gas discharged from the gas source 7 flows into the switching valve 3 through the second section 52 to open the switching valve 3; part of the gas discharged from the gas source 7 flows through the first section 51 through the input end 21, the output end 22 and the switching valve 3 in sequence and flows into the double-acting cylinder 23, which can open the solenoid valve 4 when the guide vane actuator is in the operating condition, and then make the gas flow into the switching valve 3 and open the switching valve 3, so that the first section 51 is connected, and then the gas discharged from the gas source 7 can flow to the double-acting cylinder 23 through the first section 51, and drive the double-acting cylinder 23 to move, so as to adjust the guide vane position and realize throttling control of the process gas.

[0042] Among them, the controller 1 may include a signal comparator, which compares the input signal with the preset signal interval through the signal comparator, and controls the solenoid valve 4 to open based on the comparison result. This is a conventional technology in the field and a conventional usage of the controller 1 and the solenoid valve 4, which will not be elaborated here.

[0043] The switching valve 3 includes an actuator, which is arranged in the second section 52. When the solenoid valve 4 is opened, the gas in the second section 52 drives the actuator to move, thereby opening the switching valve 3, so that the first section 51 is connected. Using gas to drive the switching valve 3 to open or close is a conventional technology in the field and will not be described here.

[0044] The input signal is a position signal converted by a field position measuring device into a current signal with an analog value of 4 to 20 mA and sent to an analog / digital conversion unit of the controller 1 .

[0045] The controller 1 includes a first terminal group and a second terminal group, the first terminal group is connected to the signal input device 8, and the second terminal group is connected to the solenoid valve 4. The controller 1 is used to compare the input signal with the preset signal interval, and control the solenoid valve 4 to open when the input signal is within the preset signal interval.

[0046] By providing a first terminal group and a second terminal group, and connecting the first terminal group to the signal input device 8, and connecting the second terminal group to the solenoid valve 4, it is possible to control the opening and closing of the solenoid valve 4 based on the comparison of the input signal and the preset signal interval. Specifically, when the input signal is within the preset signal interval, the solenoid valve 4 is controlled to open, and when the input signal is normal, the first section 51 can be connected, and the gas can flow to the double-acting cylinder 23 through the first section 51, driving the double-acting cylinder 23 to move, so as to adjust the guide vane position and realize the throttling control of the process gas.

[0047] The first terminal group includes two connection terminals, and the two connection terminals of the first terminal group are respectively connected to the signal input device 8 .

[0048] The second terminal group includes two wiring terminals, and the two wiring terminals of the second terminal group are respectively connected to the solenoid valve 4 .

[0049] The preset signal interval may be pre-stored in the controller 1. The preset signal interval may be changed according to actual needs.

[0050] The guide vane actuator includes a signal loss retention condition. When in the signal loss retention condition, the controller 1 controls the solenoid valve 4 to close based on the comparison result of the input signal of the signal input device 8 and the preset signal interval, so as to block the second section 52, so as to close the switching valve 3, so as to block the gas on the downstream side of the switching valve 3 in the first section 51 from flowing back to the upstream side of the switching valve 3. In the case of signal loss, the guide vane actuator can be retained in position, that is, the gas on the downstream side of the switching valve 3 in the first section 51 is blocked from flowing back to the upstream side of the switching valve 3, thereby maintaining the pressure on the downstream side of the switching valve 3 in the first section 51 unchanged, so that the double-acting cylinder 23 remains stationary, and the guide vane is retained in position.

[0051] The downstream side of the switching valve 3 refers to the downstream side of the switching valve 3 along the gas flow direction in the first section 51 . The upstream side of the switching valve 3 refers to the upstream side of the switching valve 3 along the gas flow direction in the first section 51 .

[0052] Among them, the signal loss may refer to the controller 1 being unable to receive the signal from the signal input device 8. The controller 1 is unable to receive the signal from the signal input device 8, the input signal approaches 0mA, and is outside the preset signal range. The controller 1 determines that the input signal is less than the preset signal range, and then sends a closing command to the controller 1 to control the electromagnetic valve 4 to close. After the electromagnetic valve 4 is closed, the switching valve 3 loses the gas in the second section 52 and closes, thereby blocking the gas on the downstream side of the switching valve 3 in the first section 51 from flowing back to the upstream side of the switching valve 3.

[0053] The controller 1 includes a first terminal group and a second terminal group, the first terminal group is connected to the signal input device 8, and the second terminal group is connected to the solenoid valve 4. The controller 1 is used to compare the input signal with the preset signal interval, and control the solenoid valve 4 to close when the input signal is outside the preset signal interval.

[0054] When the input signal is outside the preset signal range, the solenoid valve 4 is controlled to close, and the switching valve 3 can be closed when the input signal is lost, so as to block the gas on the downstream side of the switching valve 3 in the first section 51 from flowing back to the upstream side of the switching valve 3. In the case of signal loss, the guide vane actuator can be kept in place, that is, the gas on the downstream side of the switching valve 3 in the first section 51 is blocked from flowing back to the upstream side of the switching valve 3, thereby maintaining the pressure on the downstream side of the switching valve 3 in the first section 51 unchanged, so that the double-acting cylinder 23 remains stationary, and the guide vane is kept in place.

[0055] Among them, the controller 1 includes a third terminal group and a fourth terminal group, the third terminal group includes two wiring terminals, and the two wiring terminals of the third terminal group are respectively connected to the positioner 2, so that the controller 1 can control the action of the positioner 2 based on the signal input by the signal input device 8, and then adjust the guide vane position through the action of the double-acting cylinder 23 to achieve throttling control of the process gas.

[0056] The fourth terminal group includes two wiring terminals, and the two wiring terminals of the fourth terminal group are respectively connected to a 24V power supply.

[0057] The guide vane actuator includes a gas loss position retention condition. When in the gas loss position retention condition, the air pressure in the second section 52 is reduced to close the switching valve 3, so as to block the gas on the downstream side of the switching valve 3 in the first section 51 from flowing back to the upstream side of the switching valve 3. In the event of gas loss, the guide vane actuator can be retained in position, that is, the gas on the downstream side of the switching valve 3 in the first section 51 is blocked from flowing back to the upstream side of the switching valve 3, thereby maintaining the pressure on the downstream side of the switching valve 3 in the first section 51 unchanged, keeping the double-acting cylinder 23 stationary, and achieving the guide vane retention.

[0058] The downstream side of the switching valve 3 refers to the downstream side of the switching valve 3 along the gas flow direction in the first section 51 . The upstream side of the switching valve 3 refers to the upstream side of the switching valve 3 along the gas flow direction in the first section 51 .

[0059] Among them, air loss may refer to the air source 7 stopping supplying air to the first section 51 and the second section 52. After the air source 7 stops supplying air to the second section 52, the switching valve 3 loses air and closes, thereby blocking the gas on the downstream side of the switching valve 3 in the first section 51 from flowing back to the upstream side of the switching valve 3, and the guide vane actuator can be kept in position in the event of air loss.

[0060] The switching valve 3 includes an actuator, which is arranged on the first section 51 and the second section 52. When the air pressure in the second section 52 is greater than or equal to the preset pressure threshold of the actuator, the gas in the second section 52 drives the actuator to move out of the first section 51 to connect the first section 51. When the air pressure in the second section 52 is less than the preset pressure threshold of the actuator, the actuator is reset to the first section 51 to block the first section 51. The on-off of the first section 51 can be controlled by the gas pressure in the second section 52.

[0061] Among them, when the second section 52 is ventilated and the air pressure is greater than or equal to the preset pressure threshold of the actuator, the gas drives the actuator to move and drives the actuator to move out of the first section 51 to make the first section 51 connected, so that the gas discharged from the gas source 7 can flow through the input end 21, the output end 22 and the switching valve 3 of the positioner 2 on the first section 51 in sequence and then flow to the double-acting cylinder 23, driving the double-acting cylinder 23 to operate, so as to adjust the guide vane position and realize throttling control of the process gas.

[0062] Among them, when the air pressure in the second section 52 is less than the preset pressure threshold of the actuator, for example, when the air source 7 is cut off or the solenoid valve 4 is closed, a part of the actuator moves to the first section 51, and a part moves to the second section 52. The part in the first section 51 blocks the gas flow path of the first section 51, that is, blocks the connection of the first section 51, so that the gas in the first section 51 cannot flow through the switching valve 3.

[0063] Specifically, when the air is lost, the actuator can be reset to the first section 51 by the elastic force applied by the elastic member to block the first section 51. At this time, part of the actuator is in the first section 51, and part of the actuator is in the second section 52. The part in the first section 51 blocks the gas flow path of the first section 51, and the part in the second section 52 waits for the second section 52 to be ventilated, and then is pushed and moved when the air pressure is greater than or equal to the preset pressure threshold of the actuator, so as to connect the first section 51.

[0064] Among them, the preset pressure threshold can be set and adjusted according to actual needs.

[0065] The gas channel also includes a main section 53, the first section 51 and the second section 52 are respectively connected to the main section 53, and are connected to the gas source 7 through the main section 53. A pressure reducing valve 6 and a filter are provided on the main section 53. By providing the pressure reducing valve 6 and the filter, the gas can be decompressed and filtered before entering the first section 51 and the second section 52.

[0066] The gas discharged from the gas source 7 passes through the main section 53 and then enters the first section 51 and the second section 52 respectively.

[0067] The guide vane actuator provided in this embodiment may be prepared as follows before use.

[0068] Step 1, equipped with a Φ8 or Φ12 ferrule three-way joint, the gas source 7 is output after passing through the pressure reducing valve 6, connected to the connecting pipe, select a connecting pipe of appropriate length, and then connect to the ferrule three-way joint.

[0069] Step 2: The three-way connector is connected to two connecting pipes, one of which is connected to the air inlet channel of the solenoid valve 4 to form a part of the second section 52. The other is connected to the input end 21 of the positioner 2 to form a part of the first section 51. The specific positions of the solenoid valve 4, the positioner 2 and the switching valve 3 are arranged according to actual conditions.

[0070] Step 3, connect the normally closed outlet channel of the solenoid valve 4 and the cylinder of the switching valve 3 through a connecting pipe to form another part of the second section 52. Connect the output end 22 of the positioner 2 and the valve inlet of the switching valve 3 through a connecting pipe to form a part of the first section 51.

[0071] Step 4, connecting the rear outlet of the switching valve 3 and the cylinder interface of the positioner 2 through a connecting pipe to form a part of the first section 51.

[0072] Step 5, fix the SSC-24 signal comparator on the actuator bracket. After fixing, wire the signal comparator. Connect terminals 1 and 2 to the 4-20mA input signal of the DCS. Connect terminals 3 and 4 to the adjustment signal input terminal 21 of the positioner 2. Connect terminals 5 and 6 to the external 24VDC power supply to provide power for the signal comparator. Connect terminals 7 and 8 to the 24VDC output to the solenoid valve 4. The above signal cables must use 1.0-1.5mm 2 2-core branch cable, 24VDC power supply cable must use 2.5mm 2 Power cable.

[0073] Step 6, check the power supply and gas source 7, connect the 24V power supply and gas source 7, the comparator power indicator lights up, the positioner 2 screen lights up, check whether the comparator output indicator lights up, simulate the 4-20mA input signal through the external current signal, and observe whether the comparator input signal screen has a corresponding value. By adjusting the 4-20mA input signal, check whether the lower end of the actuator has a rotating movement, and check whether the solenoid valve 4 is closed.

[0074] Step 7, disconnect the input gas source 7 to check whether the switching valve 3 and the solenoid valve 4 have corresponding actions. If there are corresponding actions, adjust the external current signal to simulate the 4-20mA input signal to check whether the actuator has rotational action. If there is no rotational action, it indicates that the air loss position retention function is normal. Test the signal loss position retention function, connect the disconnected gas source 7, remove the simulated 4-20mA input signal, and the input signal screen will be around 0. Check the actions of the solenoid valve 4 and the switching valve 3. If there are actions, it indicates that the air loss position retention function is normal.

[0075] In another aspect of the present embodiment, a compressor is provided, comprising the guide vane actuator as described above.

[0076] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0077] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A guide vane actuator, characterized in that: The invention comprises a controller (1), a gas channel, a positioner (2), a switching valve (3) and a solenoid valve (4); the gas channel comprises a first section (51) and a second section (52); the first section (51) and the second section (52) are respectively connected to a gas source (7); the positioner (2) comprises an input end (21), an output end (22) and a double-acting cylinder (23); the input end (21), the output end (22), the switching valve (3) and the double-acting cylinder (23) are arranged on the first section (51); the switching valve (3) is used to control the on-off of the first section (51); the switching valve (3) is connected to the gas source (7) through the second section (52); the solenoid valve (4) is arranged on the second section (52); the solenoid valve (4) is used to control the on-off of the second section (52) so as to open or close the switching valve (3); and the controller (1) is respectively connected to a signal input device (8) and the solenoid valve (4).

2. The guide vane actuator according to claim 1, characterized in that: The controller (1) is connected to the positioner (2).

3. The guide vane actuator according to claim 1, characterized in that: The guide vane actuator includes an operating condition. When in the operating condition, the controller (1) controls the solenoid valve (4) to open based on a comparison result between an input signal of the signal input device (8) and a preset signal interval, so that part of the gas discharged from the gas source (7) flows into the switching valve (3) via the second section (52) to open the switching valve (3); and part of the gas discharged from the gas source (7) flows through the input end (21), the output end (22) and the switching valve (3) in sequence via the first section (51) to flow into the double-acting cylinder (23).

4. The guide vane actuator according to claim 3, characterized in that: The controller (1) comprises a first terminal group and a second terminal group, the first terminal group is connected to the signal input device (8), and the second terminal group is connected to the solenoid valve (4); The controller (1) is used to compare the input signal with the preset signal interval, and control the solenoid valve (4) to open when the input signal is within the preset signal interval.

5. The guide vane actuator according to claim 1, characterized in that: The guide vane actuator includes a signal-lost position-holding working condition. When in the signal-lost position-holding working condition, the controller (1) controls the solenoid valve (4) to close based on a comparison result between an input signal of the signal input device (8) and a preset signal interval, so as to block the second section (52) so as to close the switching valve (3) and block the gas on the downstream side of the switching valve (3) in the first section (51) from flowing back to the upstream side of the switching valve (3).

6. The guide vane actuator according to claim 5, characterized in that: The controller (1) comprises a first terminal group and a second terminal group, the first terminal group is connected to the signal input device (8), and the second terminal group is connected to the solenoid valve (4); The controller (1) is used to compare the input signal with the preset signal interval, and control the solenoid valve (4) to close when the input signal is outside the preset signal interval.

7. The guide vane actuator according to claim 1, characterized in that: The guide vane actuator includes a gas loss and position retention working condition. When in the gas loss and position retention working condition, the air pressure in the second section (52) is reduced so that the switching valve (3) is closed, thereby blocking the gas on the downstream side of the switching valve (3) in the first section (51) from flowing back to the upstream side of the switching valve (3).

8. The guide vane actuator according to claim 7, characterized in that: The switching valve (3) comprises an actuator, which is arranged on the first section (51) and the second section (52). When the air pressure in the second section (52) is greater than or equal to a preset pressure threshold of the actuator, the gas in the second section (52) drives the actuator to move out of the first section (51) so that the first section (51) is connected; when the air pressure in the second section (52) is less than the preset pressure threshold of the actuator, the actuator is reset to the first section (51) so as to block the first section (51).

9. The guide vane actuator according to claim 1, characterized in that: The gas channel also includes a main section (53), the first section (51) and the second section (52) are respectively connected to the main section (53), and are connected to the gas source (7) through the main section (53), and the main section (53) is provided with a pressure reducing valve (6) and a filter.

10. A compressor, characterized in that: It comprises a guide vane actuator as described in any one of claims 1 to 9.

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