Double-control hydraulic servo system for adjusting stationary blades of axial flow fan

Abstract

The utility model relates to a hydraulic servo system, in particular to a double-control hydraulic servo system for adjusting a stationary blade of an axial flow fan. Comprising a hydraulic control unit and a hydraulic servo motor used in cooperation with the hydraulic control unit. The hydraulic control unit comprises a control module and a valve block arranged on a hydraulic servo motor shell, and a manual electromagnetic control oil way and a servo control oil way which are connected in parallel are arranged in the valve block. The control module is connected with the manual electromagnetic control oil way and the servo control oil way and controls the manual electromagnetic control oil way or the servo control oil way to drive the hydraulic servo motor. The utility model has the advantages that on-line maintenance or replacement of faults of the servo control oil way can be realized under the conditions that the production efficiency is not influenced and the machine does not need to be stopped.

Description

Technical Field

[0001] The utility model relates to a hydraulic servo system, in particular to a dual-control hydraulic servo system for adjusting stationary blades of an axial flow fan. Background Art

[0002] The axial fan's stator blade adjustment system utilizes two servo motors, one on each side, for synchronous drive and adjustment. Specifically, the left servo motor is equipped with a stroke control assembly to precisely control the opening and closing position of the stator blades, while the right servo motor is equipped with a hydraulic control unit for more precise adjustment.

[0003] Traditional hydraulic control units primarily consist of two components: an oil valve block and a servo valve, which are tightly connected to the servo motor via a bulkhead adapter. However, the functionality of this hydraulic control unit is relatively limited, relying primarily on the servo valve to regulate oil pressure and flow, thereby achieving precise control of the servo motor's operating speed and direction.

[0004] However, if the servo valve fails, the entire system needs to be shut down for maintenance or replacement. This operation is not only tedious and complicated, but also has a serious negative impact on production efficiency. Utility Model Content

[0005] In order to solve the technical problems existing in the prior art, the utility model provides a dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan, which can realize online maintenance or replacement of servo control oil circuit faults without affecting production efficiency and without shutting down the machine.

[0006] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0007] A dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan, comprising a hydraulic control unit and a hydraulic servo motor used in conjunction with the control unit;

[0008] The hydraulic control unit includes a control module and a valve block arranged on the housing of the hydraulic servo motor, wherein the valve block is provided with a manual electromagnetic control oil circuit and a servo control oil circuit connected in parallel;

[0009] The side wall of the valve block is provided with a P oil port joint, a T oil port joint, an A oil port joint and a B oil port joint; the P oil port joint and the T oil port joint are connected to the hydraulic source, the A oil port joint is connected to the rodless oil chamber of the hydraulic servo motor, and the B oil port joint is connected to the rod oil chamber of the hydraulic servo motor;

[0010] One end of the oil inlet channel of the manual electromagnetic control oil circuit and the servo control oil circuit is connected to the P oil port connector, and the other end is connected to the A oil port connector; one end of the oil return channel of the manual electromagnetic control oil circuit and the servo control oil circuit is connected to the T oil port connector, and the other end is connected to the B oil port connector;

[0011] The control module is connected to the manual electromagnetic control oil circuit and the servo control oil circuit to control the manual electromagnetic control oil circuit or the servo control oil circuit to drive the hydraulic servo motor.

[0012] Furthermore, the manual electromagnetic control oil circuit includes a two-way throttle valve electrically connected to the control module, a three-position four-way electromagnetic reversing valve, and a first oil inlet channel front section, a first oil inlet channel rear section, a first oil return channel front section and a first oil return channel rear section located inside the valve block;

[0013] The two-way throttle valve is installed on the side of the valve block, and the three-position four-way solenoid directional valve is installed on the side of the two-way throttle valve, and the P port, T port, A port, and B port of the three-position four-way solenoid directional valve are connected to the P channel, T channel, A channel, and B channel of the two-way throttle valve respectively;

[0014] The P channel of the two-way throttle valve is connected to the end of the front section of the first oil inlet channel, and the A channel of the two-way throttle valve is connected to the starting end of the rear section of the first oil inlet channel; the starting end of the front section of the first oil inlet channel is connected to the P oil port connector, and the end of the rear section of the first oil inlet channel is connected to the A oil port connector;

[0015] The T channel of the two-way throttle valve is connected to the end of the front section of the first oil return channel, and the B channel of the two-way throttle valve is connected to the starting end of the rear section of the first oil return channel; the starting end of the front section of the first oil return channel is connected to the T oil port joint, and the end of the rear section of the first oil return channel is connected to the B oil port joint.

[0016] Furthermore, a bidirectional hydraulic lock electrically connected to the control module is provided between the valve block and the bidirectional throttle valve;

[0017] The two ends of the P channel of the bidirectional hydraulic lock are respectively connected to the end of the front section of the first oil inlet channel and the P channel of the bidirectional throttle valve;

[0018] The two ends of the T channel of the bidirectional hydraulic lock are respectively connected to the end of the front section of the first oil return channel and the T channel of the bidirectional throttle valve;

[0019] The two ends of the A channel of the bidirectional hydraulic lock are respectively connected to the starting end of the rear section of the first oil inlet channel and the A channel of the bidirectional throttle valve;

[0020] Both ends of the B channel of the bidirectional hydraulic lock are respectively connected to the starting end of the rear section of the first oil return channel and the B channel of the bidirectional throttle valve.

[0021] Furthermore, the servo control oil circuit includes a three-position four-way servo valve fixedly mounted on the outside of the valve block and electrically connected to the control module, a hydraulically controlled one-way valve, an oil return cut-off valve, and a front section of the second oil inlet channel, a rear section of the second oil inlet channel, a front section of the second oil return channel, and a rear section of the second oil return channel located inside the valve block;

[0022] The P port of the three-position four-way servo valve is connected to the end of the front section of the second oil inlet channel, the beginning of the front section of the second oil inlet channel is connected to the P oil port connector, the A port of the three-position four-way servo valve is connected to the beginning of the rear section of the second oil inlet channel, and the end of the rear section of the second oil inlet channel is connected to the A oil port connector;

[0023] The T port of the three-position four-way servo valve is connected to the end of the front section of the second oil return channel, the starting end of the front section of the second oil return channel is connected to the T oil port connector, the B port of the three-position four-way servo valve is connected to the starting end of the rear section of the second oil return channel, and the end of the rear section of the second oil return channel is connected to the B oil port connector;

[0024] The oil return cut-off valve is located on the front section of the second oil return channel;

[0025] The hydraulically controlled one-way valve is located on the front section of the second oil inlet channel;

[0026] The P port of the pilot solenoid valve is connected to the P oil port connector, the T port of the pilot solenoid valve is connected to the T oil port connector, and the B port of the pilot solenoid valve is connected to the hydraulically controlled one-way valve.

[0027] Furthermore, the valve block is provided with a plug-in bidirectional hydraulic lock electrically connected to the control module, and the P channel and T channel of the plug-in bidirectional hydraulic lock coincide with the rear section of the second oil inlet channel and the rear section of the second oil return channel respectively.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan provided by the present invention can avoid the use of complex connecting pipelines in the system by integrating the manual electromagnetic control oil circuit and the servo control oil circuit inside the valve block, which helps to reduce the cavity effect and improve the response speed of the system; and the manual electromagnetic control oil circuit and the servo control oil circuit adopt a parallel design. When the system is working normally, the servo control oil circuit drives the hydraulic servo motor to work. When the servo control oil circuit fails, the manual electromagnetic valve control oil circuit can be used to drive the hydraulic servo motor to work; the problem of the stator blade angle being unable to be adjusted due to a servo control oil circuit failure is avoided; at the same time, due to the existence of the manual electromagnetic control oil circuit, the servo control oil circuit failure can be repaired and replaced online without affecting production efficiency and without shutting down the machine.

[0030] 2. The dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan provided by the utility model provides a two-way hydraulic lock on the manual electromagnetic control oil circuit and a plug-in two-way hydraulic lock on the servo control oil circuit. When the electromagnetic reversing valve or servo valve loses control instructions or loses power or pressure, the servo motor operating position can be locked to ensure that the stator blade angle is kept in position. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The structure of the embodiment of the utility model is shown in FIG. Figure 1 ;

[0032] Figure 2 The structure of the embodiment of the utility model is shown in FIG. Figure 2 ;

[0033] Figure 3 This is a hydraulic principle diagram of an embodiment of the present utility model.

[0034] Explanation of the accompanying drawings: 1 is a hydraulic control unit, 2 is a hydraulic servo motor, 3 is a valve block, 31 is a P oil port connector, 32 is a T oil port connector, 33 is an A oil port connector, 34 is a B oil port connector, 4 is a manual electromagnetic control oil circuit, 41 is the front section of the first oil inlet channel, 42 is the rear section of the first oil inlet channel, 43 is the front section of the first oil return channel, 44 is the rear section of the first oil return channel, 5 is a servo control oil circuit, 51 is the front section of the second oil inlet channel, 52 is the rear section of the second oil inlet channel, 53 is the front section of the second oil return channel, 54 is the rear section of the second oil return channel, 6 is a two-way throttle valve, 7 is a three-position four-way electromagnetic reversing valve, 8 is a two-way hydraulic lock, 9 is a three-position four-way servo valve, 10 is a hydraulically controlled one-way valve, 11 is an oil return stop valve, 12 is a pilot solenoid valve, and 13 is a plug-in two-way hydraulic lock. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0036] like Figure 1 and Figure 2 As shown, a dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan includes a hydraulic control unit 1 and a hydraulic servo motor 2 used in conjunction with the hydraulic control unit 1; the hydraulic control unit 1 includes a control module and a valve block 3 provided on the housing of the hydraulic servo motor 2, as shown in FIG. Figure 3 As shown, the valve block 3 is provided with a manual electromagnetic control oil circuit 4 and a servo control oil circuit 5 connected in parallel;

[0037] like Figure 1 and Figure 2 As shown, the side wall of the valve block 3 is provided with a P oil port connector 31, a T oil port connector 32, an A oil port connector 33, and a B oil port connector 34. The P oil port connector 31 and the T oil port connector 32 are connected to a hydraulic source, which is an external hydraulic source and is used to provide hydraulic oil to the hydraulic servo motor 2. The A oil port connector 33 is connected to the rodless oil chamber of the hydraulic servo motor 2, and the B oil port connector 34 is connected to the rod oil chamber of the hydraulic servo motor 2.

[0038] like Figure 3 As shown, one end of the oil inlet channel of the manual electromagnetic control oil circuit 4 and the servo control oil circuit 5 is connected to the P oil port connector 31, and the other end is connected to the A oil port connector 33; one end of the oil return channel of the manual electromagnetic control oil circuit 4 and the servo control oil circuit 5 is connected to the T oil port connector 32, and the other end is connected to the B oil port connector 34;

[0039] The control module is connected to the manual electromagnetic control oil circuit 4 and the servo control oil circuit 5 to control the manual electromagnetic control oil circuit 4 or the servo control oil circuit 5 to drive the hydraulic servo motor 2 .

[0040] like Figure 1 and Figure 3 As shown, the manual electromagnetic control oil circuit 4 includes a two-way throttle valve 6 electrically connected to the control module, a three-position four-way electromagnetic reversing valve 7, and a first oil inlet channel front section 41, a first oil inlet channel rear section 42, a first oil return channel front section 43, and a first oil return channel rear section 44 located inside the valve block 3;

[0041] The two-way throttle valve 6 is installed on the side of the valve block 3, and the three-position four-way solenoid directional valve 7 is installed on the side of the two-way throttle valve 6, and the P port, T port, A port, and B port of the three-position four-way solenoid directional valve 7 are connected to the P channel, T channel, A channel, and B channel of the two-way throttle valve 6 respectively.

[0042] The P channel of the two-way throttle valve 6 is connected to the end of the first oil inlet channel front section 41, and the A channel of the two-way throttle valve 6 is connected to the beginning of the first oil inlet channel rear section 42; the beginning of the first oil inlet channel front section 41 is connected to the P oil port connector 31, and the end of the first oil inlet channel rear section 42 is connected to the A oil port connector 33;

[0043] The T channel of the two-way throttle valve 6 is connected to the end of the front section 43 of the first oil return channel, and the B channel of the two-way throttle valve 6 is connected to the starting end of the rear section 44 of the first oil return channel; the starting end of the front section 43 of the first oil return channel is connected to the T oil port connector 32, and the end of the rear section 44 of the first oil return channel is connected to the B oil port connector 34.

[0044] like Figure 1 and Figure 3As shown, in order to lock the servo motor operating position so that the stator blade angle can be kept in position when the solenoid reversing valve loses control instructions or loses power or pressure, a two-way hydraulic lock 8 electrically connected to the control module is provided between the valve block 3 and the two-way throttle valve 6; the two ends of the P channel of the two-way hydraulic lock 8 are respectively connected to the end of the first oil inlet channel front section 41 and the P channel of the two-way throttle valve 6; the two ends of the T channel of the two-way hydraulic lock 8 are respectively connected to the end of the first oil return channel front section 43 and the T channel of the two-way throttle valve 6; the two ends of the A channel of the two-way hydraulic lock 8 are respectively connected to the starting end of the first oil inlet channel rear section 42 and the A channel of the two-way throttle valve 6; the two ends of the B channel of the two-way hydraulic lock 8 are respectively connected to the starting end of the first oil return channel rear section 44 and the B channel of the two-way throttle valve 6.

[0045] like Figure 2 and Figure 3 As shown, the servo control oil circuit 5 includes a three-position four-way servo valve 9 fixedly mounted on the outside of the valve block 3 and electrically connected to the control module, a hydraulically controlled one-way valve 10, an oil return cut-off valve 11, and a second oil inlet channel front section 51, a second oil inlet channel rear section 52, a second oil return channel front section 53, and a second oil return channel rear section 54 located inside the valve block 3;

[0046] The P port of the three-position four-way servo valve 9 is connected to the end of the front section 51 of the second oil inlet passage, the beginning of the front section 51 of the second oil inlet passage is connected to the P oil port connector 31, and the A port of the three-position four-way servo valve 9 is connected to the beginning of the rear section 52 of the second oil inlet passage, the end of the rear section 52 of the second oil inlet passage is connected to the A oil port connector 33.

[0047] The T port of the three-position four-way servo valve 9 is connected to the end of the front section 53 of the second oil return passage, the beginning of the front section 53 of the second oil return passage is connected to the T oil port connector 32, and the B port of the three-position four-way servo valve 9 is connected to the beginning of the rear section 54 of the second oil return passage, the end of the rear section 54 of the second oil return passage is connected to the B oil port connector 34;

[0048] The oil return stop valve 11 is located on the front section of the second oil return channel;

[0049] The hydraulically controlled one-way valve 10 is located on the front section of the second oil inlet channel; the P port of the pilot solenoid valve 12 is connected to the P oil port connector 31, the T port of the pilot solenoid valve 12 is connected to the T oil port connector 32, and the B port of the pilot solenoid valve 12 is connected to the hydraulically controlled one-way valve 10.

[0050] like Figure 2 and Figure 3As shown, in order to lock the servo motor operating position so that the stator blade angle can be kept in position when the servo valve loses control instructions or loses power or pressure, a plug-in two-way hydraulic lock 13 electrically connected to the control module is provided on the valve block 3. The P channel and T channel of the plug-in two-way hydraulic lock 13 respectively coincide with the rear section 52 of the second oil inlet channel and the rear section 54 of the second oil return channel.

[0051] like Figure 3 As shown, the dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan provided by the present invention, when the servo control oil circuit 5 is controlled by the control module to drive the servo hydraulic motor, hydraulic oil in the external hydraulic source enters the pilot solenoid valve 12 through the P oil port connector 31. The control module controls the pilot solenoid valve 12 to pass the hydraulic oil into the hydraulic control check valve 10, and the hydraulic oil opens the control port of the hydraulic control check valve 10. At this time, the hydraulic oil passes through the hydraulic control check valve 10 and enters the P port of the three-position four-way servo valve 9 to wait. When the three-position four-way servo valve 9 receives the control command from the control module, the three-position four-way servo valve 9 adjusts the opening size and opening direction of the three-position four-way servo valve 9 according to the control command, thereby controlling the speed and direction of the hydraulic servo motor 2, ultimately achieving the adjustment of the stator blades of the axial flow fan.

[0052] When the manual electromagnetic control oil circuit 4 is controlled by the control module to drive the servo hydraulic motor to work: the hydraulic oil in the external hydraulic source enters the P port of the three-position four-way electromagnetic reversing valve 7 through the P oil port connector 31 to wait; when the three-position four-way electromagnetic reversing valve 7 receives the control instruction of the control module, the three-position four-way electromagnetic reversing valve 7 adjusts the opening direction of the three-position four-way electromagnetic reversing valve 7 according to the control instruction to control the running direction of the servo motor; and then adjusts the valve port size of the two-way throttle valve 6 to adjust the running speed of the hydraulic servo motor 2; the adjustment of the stator blade angle of the axial flow fan is finally achieved through the coordinated use of the three-position four-way electromagnetic reversing valve 7 and the two-way throttle valve 6.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan, characterized by: It comprises a hydraulic control unit (1) and a hydraulic servo motor (2) used in conjunction with the hydraulic control unit; The hydraulic control unit (1) comprises a control module and a valve block (3) arranged on a housing of a hydraulic servo motor (2); a manual electromagnetic control oil circuit (4) and a servo control oil circuit (5) connected in parallel are arranged in the valve block (3); A P oil port joint (31), a T oil port joint (32), an A oil port joint (33) and a B oil port joint (34) are provided on the side wall of the valve block (3); the P oil port joint (31) and the T oil port joint (32) are connected to the hydraulic source, the A oil port joint (33) is connected to the rodless oil chamber of the hydraulic servo motor (2), and the B oil port joint (34) is connected to the rod oil chamber of the hydraulic servo motor (2); One end of the oil inlet channel of the manual electromagnetic control oil circuit (4) and the servo control oil circuit (5) is connected to the P oil port connector (31), and the other end is connected to the A oil port connector (33); one end of the oil return channel of the manual electromagnetic control oil circuit (4) and the servo control oil circuit (5) is connected to the T oil port connector (32), and the other end is connected to the B oil port connector (34); The control module is connected to the manual electromagnetic control oil circuit (4) and the servo control oil circuit (5), and controls the manual electromagnetic control oil circuit (4) or the servo control oil circuit (5) to drive the hydraulic servo motor (2).

2. The dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan according to claim 1, characterized in that: The manual electromagnetic control oil circuit (4) includes a two-way throttle valve (6) electrically connected to the control module, a three-position four-way electromagnetic reversing valve (7), and a first oil inlet channel front section (41), a first oil inlet channel rear section (42), a first oil return channel front section (43), and a first oil return channel rear section (44) located inside the valve block (3); The two-way throttle valve (6) is installed on the side of the valve block (3), and the three-position four-way electromagnetic reversing valve (7) is installed on the side of the two-way throttle valve (6), and the P port, T port, A port, and B port of the three-position four-way electromagnetic reversing valve (7) are respectively connected to the P channel, T channel, A channel, and B channel of the two-way throttle valve (6) in a one-to-one correspondence; The P channel of the two-way throttle valve (6) is connected to the end of the front section (41) of the first oil inlet channel, and the A channel of the two-way throttle valve (6) is connected to the starting end of the rear section (42) of the first oil inlet channel; the starting end of the front section (41) of the first oil inlet channel is connected to the P oil port connector (31), and the end of the rear section (42) of the first oil inlet channel is connected to the A oil port connector (33); The T channel of the two-way throttle valve (6) is connected to the end of the front section (43) of the first oil return channel, and the B channel of the two-way throttle valve (6) is connected to the starting end of the rear section (44) of the first oil return channel; the starting end of the front section (43) of the first oil return channel is connected to the T oil port connector (32), and the end of the rear section (44) of the first oil return channel is connected to the B oil port connector (34).

3. The dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan according to claim 1, characterized in that: A bidirectional hydraulic lock (8) electrically connected to the control module is provided between the valve block (3) and the bidirectional throttle valve (6); The two ends of the P channel of the bidirectional hydraulic lock (8) are respectively connected to the end of the front section (41) of the first oil inlet channel and the P channel of the bidirectional throttle valve (6); The two ends of the T channel of the bidirectional hydraulic lock (8) are respectively connected to the end of the front section (43) of the first oil return channel and the T channel of the bidirectional throttle valve (6); The two ends of the A channel of the bidirectional hydraulic lock (8) are respectively connected to the starting end of the rear section (42) of the first oil inlet channel and the A channel of the bidirectional throttle valve (6); The two ends of the B channel of the bidirectional hydraulic lock (8) are respectively connected to the starting end of the rear section (44) of the first oil return channel and the B channel of the bidirectional throttle valve (6).

4. The dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan according to claim 1, characterized in that: The servo control oil circuit (5) comprises a three-position four-way servo valve (9) fixedly mounted on the outside of the valve block (3) and electrically connected to the control module, a hydraulically controlled one-way valve (10), an oil return stop valve (11), and a second oil inlet channel front section (51), a second oil inlet channel rear section (52), a second oil return channel front section (53), and a second oil return channel rear section (54) located inside the valve block (3); The P port of the three-position four-way servo valve (9) is connected to the end of the front section (51) of the second oil inlet channel, and the beginning of the front section (51) of the second oil inlet channel is connected to the P oil port connector (31). The A port of the three-position four-way servo valve (9) is connected to the beginning of the rear section (52) of the second oil inlet channel, and the end of the rear section (52) of the second oil inlet channel is connected to the A oil port connector (33). The T port of the three-position four-way servo valve (9) is connected to the end of the front section (53) of the second oil return channel, the beginning of the front section (53) of the second oil return channel is connected to the T oil port connector (32), the B port of the three-position four-way servo valve (9) is connected to the beginning of the rear section (54) of the second oil return channel, and the end of the rear section (54) of the second oil return channel is connected to the B oil port connector (34); The oil return stop valve (11) is located on the front section of the second oil return channel; The hydraulically controlled one-way valve (10) is located on the front section of the second oil inlet channel; The P port of the pilot solenoid valve (12) is connected to the P oil port connector (31), the T port of the pilot solenoid valve (12) is connected to the T oil port connector (32), and the B port of the pilot solenoid valve (12) is connected to the hydraulically controlled one-way valve (10).

5. The dual-control hydraulic servo system for adjusting the stator blades of an axial flow fan according to claim 4, characterized in that: The valve block (3) is provided with a plug-in bidirectional hydraulic lock (13) (8) electrically connected to the control module, and the P channel and T channel of the plug-in bidirectional hydraulic lock (13) respectively overlap with the rear section (52) of the second oil inlet channel and the rear section (54) of the second oil return channel.

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