Automatic switching control circuit for double oil pumps of hydraulic turbine governor

Abstract

The utility model discloses a hydraulic turbine governor double-oil-pump automatic switching control circuit which comprises a direct-current air switch QA1, a first pump circuit breaker Q1, a second pump circuit breaker Q2, a first pump contactor QC1, a thermal relay FR1, a second pump contactor QC2 and a thermal relay element which are connected through a main loop and a control loop, under the condition that PLC control is not needed to be added, the double-pump automatic switching function is achieved through a hardware loop, and the double-oil-pump automatic switching control circuit is simple in structure and convenient to operate. Oil pumps are used in turn, excessive use and abrasion of a single pump are avoided, the service life of equipment is prolonged, continuous operation of the system is ensured, the optimal operation state is kept, and efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of water turbine governors, and in particular relates to an automatic switching control circuit for dual oil pumps in a water turbine governor. Background Technology

[0002] In existing turbine governor control systems, if a dual-oil pump control device is required to achieve automatic switching between the two oil pumps, a PLC module needs to be configured and programmed. Without a PLC, the switching between the two pumps relies on manual operation, which increases the possibility of operational errors. The inability to automatically switch leads to overuse of a single pump, reduces the overall service life of the equipment, and is prone to damage accidents, resulting in economic losses. Utility Model Content

[0003] This utility model provides an automatic switching control circuit for dual oil pumps in a water turbine governor, aiming to solve the aforementioned problems.

[0004] This utility model is implemented as follows: an automatic switching control circuit for dual oil pumps in a water turbine governor, comprising a primary circuit and a secondary circuit;

[0005] The primary circuit includes a #1 pump circuit breaker Q1, a #2 pump circuit breaker Q2, a #1 pump contactor QC1, a thermal relay FR1, a #2 pump contactor QC2, a thermal relay FR2, and a three-phase AC power supply. The three-phase AC power supply is connected to the #1 pump circuit breaker Q1 and the #2 pump circuit breaker Q2 via large terminals, and then connected to the #1 pump contactor QC1, the thermal relay FR1, the #2 pump contactor QC2, and the thermal relay FR2, respectively.

[0006] The secondary circuits include a pump stop control circuit, a pump start control circuit, a pump start interlock control circuit, a dual pump start control circuit, a dual pump start interlock control circuit, a manual control circuit for pump #1, a manual control circuit for pump #2, an automatic control circuit for pumps #1 and #2, an automatic switching control circuit, an automatic switching interlock control circuit, and an automatic switching reset control circuit.

[0007] Furthermore, the pump stop control circuit is formed by connecting the signal "high pressure" and the signal "excessive pressure" in series with relay K1.

[0008] Furthermore, the pump start control circuit is formed by connecting the signal "low pressure" in series with relay K2, and the pump start lockout control circuit is formed by connecting the normally closed contact of relay K1 and the normally open contact of relay K2 in series with relay K2.

[0009] Furthermore, the dual-pump start control circuit is formed by connecting the signal "pressure too low" in series with relay K3, and the dual-pump start interlock control circuit is formed by connecting the normally closed contact of relay K1, the normally open contact of relay K2, and the normally open contact of relay K3 in series with relay K3.

[0010] Furthermore, the manual control circuit of pump #1 is formed by connecting the normally open contact of the automatic switching knob SA1 for pump #1, the normally closed contact of the thermal relay FR1, and the coil of contactor QC1 for pump #1 in series; the manual control circuit of pump #2 is formed by connecting the normally open contact of the automatic switching knob SA2 for pump #2, the normally closed contact of the thermal relay FR2, and the coil of contactor QC2 for pump #2 in series.

[0011] Furthermore, the automatic control circuits for pumps #1 and #2 are composed of normally open contacts of relay K2, normally closed contacts of relay K1, normally open contacts of thermal relay FR2 and FR1, normally open contacts of relay K3, normally open contacts of relay K8, normally closed contacts of relay K8, auxiliary normally open contacts of manual / automatic switching knob SA1 for pump #1, auxiliary normally open contacts of manual / automatic switching knob SA2 for pump #2, normally closed contacts of thermal relay FR1, coil of contactor QC1 for pump #1, normally closed contacts of thermal relay FR2, and coil of contactor QC2 for pump #2.

[0012] Furthermore, the automatic switching control circuit is formed by connecting the normally open contact of contactor QC1 of pump #1, the normally closed contact of relay K7, the auxiliary normally open contact of automatic switching knob SA2 of pump #2, and relay K8 in series; the automatic switching interlocking control circuit is formed by connecting the normally open contact of relay K8, the normally closed contact of relay K9, the auxiliary normally open contact of automatic switching knob SA2 of pump #2, and relay K8 in series; the automatic switching reset control circuit is formed by connecting the normally open contact of contactor QC2 of pump #2, the normally open contact of relay K7, and relay K9 in series.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model discloses an automatic switching control circuit for dual oil pumps in a water turbine governor. It achieves automatic switching control of dual oil pumps without the need for a PLC, eliminating the need for PLC and related software programming, reducing equipment and maintenance costs, and realizing automatic switching function. By using the oil pumps alternately, it avoids excessive wear from the use of a single pump. By optimizing the operation of the oil pumps and reducing equipment wear, it extends the service life of the equipment and ensures continuous system operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the circuit structure of this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0018] Please see Figure 1 This utility model provides an automatic switching control circuit for dual oil pumps in a water turbine governor, which realizes automatic switching of dual pumps without PLC, is safe and reliable, and has complete functions, including a primary circuit and a secondary circuit.

[0019] The primary circuit includes circuit breaker Q1 for pump #1, circuit breaker Q2 for pump #2, contactor QC1 for pump #1, thermal relay FR1, contactor QC2 for pump #2, thermal relay FR2, and a three-phase AC power supply. The three-phase AC power supply is connected to circuit breaker Q1 for pump #1 and circuit breaker Q2 for pump #2 via large terminal connections, and then connected to contactor QC1 for pump #1, thermal relay FR1, contactor QC2 for pump #2, and thermal relay FR2, respectively.

[0020] The secondary circuit includes a pump stop control circuit, a pump start control circuit, a pump start interlock control circuit, a dual pump start control circuit, a dual pump start interlock control circuit, a manual control circuit for pump #1, a manual control circuit for pump #2, an automatic control circuit for pumps #1 and #2, an automatic switching control circuit, an automatic switching interlock control circuit, and an automatic switching reset control circuit.

[0021] The pump stop control circuit is formed by connecting the "high pressure" signal and the "excessive pressure" signal in series with relay K1.

[0022] The pump start control circuit is formed by connecting the signal "low pressure" in series with relay K2, and the pump start lockout control circuit is formed by connecting the normally closed contact of relay K1 and the normally open contact of relay K2 in series with relay K2.

[0023] The dual-pump start control circuit is formed by connecting the "pressure too low" signal in series with relay K3. The dual-pump start interlock control circuit is formed by connecting the normally closed contact of relay K1, the normally open contact of relay K2, and the normally open contact of relay K3 in series with relay K3.

[0024] The manual control circuit for pump #1 is formed by connecting the normally open contact of the automatic switching knob SA1 for pump #1, the normally closed contact of the thermal relay FR1, and the coil of contactor QC1 for pump #1 in series. The manual control circuit for pump #2 is formed by connecting the normally open contact of the automatic switching knob SA2 for pump #2, the normally closed contact of the thermal relay FR2, and the coil of contactor QC2 for pump #2 in series.

[0025] The automatic control circuits for pumps #1 and #2 consist of the normally open contact of relay K2, the normally closed contact of relay K1, the normally open contact of thermal relay FR2, the normally open contact of thermal relay FR1, the normally open contact of relay K3, the normally open contact of relay K8, the normally closed contact of relay K8, the auxiliary normally open contact of the manual / automatic switching knob SA1 for pump #1, the auxiliary normally open contact of the manual / automatic switching knob SA2 for pump #2, the normally closed contact of thermal relay FR1, the coil of contactor QC1 for pump #1, the normally closed contact of thermal relay FR2, and the coil of contactor QC2 for pump #2.

[0026] The automatic switching control circuit is formed by connecting the normally open contact of contactor QC1 of pump #1, the normally closed contact of relay K7, the normally open auxiliary contact of automatic switching knob SA2 of pump #2, and relay K8 in series. The automatic switching interlocking control circuit is formed by connecting the normally open contact of relay K8, the normally closed contact of relay K9, the normally open auxiliary contact of automatic switching knob SA2 of pump #2, and relay K8 in series. The automatic switching reset control circuit is formed by connecting the normally open contact of contactor QC2 of pump #2, the normally open contact of relay K7, and relay K9 in series.

[0027] Among them, relay K1 is the pump stop relay, relay K2 is the pump start relay, relay K3 is the dual pump start relay, relay K7 is the pump stop relay, relay K8 is the oil pump switching relay, and relay K9 is the switching reset relay.

[0028] Oil pump manual control:

[0029] The manual / automatic switching knob SA1 (normally open contact), thermal relay FR1 (normally closed contact), and contactor QC1 coil are connected in series to form the manual control circuit for pump #1. When SA1 is switched to manual mode, the contactor QC1 coil is energized, the main contacts close, and pump #1 starts running.

[0030] The manual / automatic switching knob SA2 (normally open contact), thermal relay FR2 (normally closed contact), and contactor QC2 coil are connected in series to form the manual control circuit for pump #2. When SA2 is switched to manual mode, the contactor QC2 coil is energized, the main contacts close, and pump #2 starts running.

[0031] Automatic oil pump switching control:

[0032] During the electrical control of the hydraulic system, the two oil pumps automatically switch between use. Both the manual / automatic switching knob SA1 for pump #1 and the manual / automatic switching knob SA2 for pump #2 are switched to automatic. When the pressure is low, the coil of relay K2 is energized, the normally open contact of K2 in the automatic circuit closes, the coil of contactor QC1 is energized, the main contact closes, and pump #1 starts running.

[0033] When the pressure is too low, the coil of the dual-pump relay K3 is energized, and the normally open contact of K3 in the automatic circuit closes. The coils of contactors QC1 and QC2 are simultaneously energized, and pumps #1 and #2 operate simultaneously. Furthermore, the normally closed contact of K1, the normally open contact of K2, and the normally open contact of K3 are connected in series with K3 to form a closed interlocking control circuit.

[0034] When the pressure is high, the coil of the pump stop relay K1 is energized. The normally closed contact of K1, the normally open contact of K2, and the normally open contact of K3 are connected in series with K3 to form the interlocking control circuit, which then disconnects. Simultaneously, another pair of normally closed contacts of K1 connected in series in the automatic control circuit also disconnects, de-energizing the automatic control circuit and stopping the oil pump. When pump #1 fails, the normally open contact of the #1 pump thermal relay closes, the coil of contactor QC2 is energized, the main contacts close, and pump #2 starts running. When pump #2 fails, the normally open contact of the #2 pump thermal relay closes, the coil of contactor QC1 is energized, the main contacts close, and pump #1 starts running.

[0035] When pump #1 is running, the normally open contact of contactor QC1 closes, the oil pressure reaches the rated pressure, the coil of relay K7 is energized, the normally open contact of K7 closes, the manual / automatic switching knob SA2 of pump #2 switches to automatic, the coil of oil pump switching relay K8 is energized, the normally open contact of K8 closes, the normally closed contact opens, and pump #2 is automatically switched.

[0036] When pump #2 is running, the normally open contact of contactor QC2 closes, the oil pressure reaches the rated pressure, the coil of relay K7 is energized, the normally open contact of K7 closes, the coil of relay K9 is energized, the normally closed contact of K9 opens, and the oil pump rotation relay K8 is de-energized. The automatic control circuit automatically switches to pump #1, realizing the alternating use of the oil pumps.

[0037] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic switching control circuit for dual oil pumps in a turbine governor, characterized in that: Includes primary and secondary circuits; The primary circuit includes a #1 pump circuit breaker Q1, a #2 pump circuit breaker Q2, a #1 pump contactor QC1, a thermal relay FR1, a #2 pump contactor QC2, a thermal relay FR2, and a three-phase AC power supply. The three-phase AC power supply is connected to the #1 pump circuit breaker Q1 and the #2 pump circuit breaker Q2 via large terminals, and then connected to the #1 pump contactor QC1, the thermal relay FR1, the #2 pump contactor QC2, and the thermal relay FR2, respectively. The secondary circuits include a pump stop control circuit, a pump start control circuit, a pump start interlock control circuit, a dual pump start control circuit, a dual pump start interlock control circuit, a manual control circuit for pump #1, a manual control circuit for pump #2, an automatic control circuit for pumps #1 and #2, an automatic switching control circuit, an automatic switching interlock control circuit, and an automatic switching reset control circuit.

2. The dual oil pump automatic switching control circuit of a hydro-turbine governor according to claim 1, characterized in that: The pump stop control circuit is formed by connecting the "high pressure" signal and the "excessive pressure" signal in series with relay K1.

3. The dual oil pump automatic switching control circuit of a hydro-turbine governor according to claim 2, characterized in that: The pump start control circuit is formed by connecting the signal "low pressure" in series with relay K2, and the pump start lockout control circuit is formed by connecting the normally closed contact of relay K1 and the normally open contact of relay K2 in series with relay K2.

4. The dual oil pump automatic switching control circuit of a hydro-turbine governor according to claim 3, characterized in that: The dual-pump start control circuit is formed by connecting the signal "pressure too low" in series with relay K3. The dual-pump start interlock control circuit is formed by connecting the normally closed contact of relay K1, the normally open contact of relay K2, and the normally open contact of relay K3 in series with relay K3.

5. The automatic switching control circuit for dual oil pumps in a turbine governor according to claim 1, characterized in that: The manual control circuit of pump #1 is formed by connecting the normally open contact of the automatic switching knob SA1 for pump #1, the normally closed contact of the thermal relay FR1, and the coil of contactor QC1 for pump #1 in series. The manual control circuit of pump #2 is formed by connecting the normally open contact of the automatic switching knob SA2 for pump #2, the normally closed contact of the thermal relay FR2, and the coil of contactor QC2 for pump #2 in series.

6. The automatic switching control circuit for dual oil pumps in a turbine governor according to claim 4, characterized in that: The automatic control circuits for pumps #1 and #2 consist of normally open contacts of relay K2, normally closed contacts of relay K1, normally open contacts of thermal relay FR2 and FR1, normally open contacts of relay K3, normally open contacts of relay K8, normally closed contacts of relay K8, auxiliary normally open contacts of the manual / automatic switching knob SA1 for pump #1, auxiliary normally open contacts of the manual / automatic switching knob SA2 for pump #2, normally closed contacts of thermal relay FR1, coils of contactor QC1 and FR2 for pump #1, and coils of contactor QC2 for pump #2.

7. The automatic switching control circuit for dual oil pumps in a turbine governor according to claim 6, characterized in that: The automatic switching control circuit is formed by connecting the normally open contact of contactor QC1 of pump #1, the normally closed contact of relay K7, the auxiliary normally open contact of automatic switching knob SA2 of pump #2, and relay K8 in series. The automatic switching interlocking control circuit is formed by connecting the normally open contact of relay K8, the normally closed contact of relay K9, the auxiliary normally open contact of automatic switching knob SA2 of pump #2, and relay K8 in series. The automatic switching reset control circuit is formed by connecting the normally open contact of contactor QC2 of pump #2, the normally open contact of relay K7, and relay K9 in series.

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