Marine pump station cooler control circuit based on bimetal temperature sensor

Abstract

The invention provides a marine pump station cooler control circuit based on a bimetal temperature sensor, which comprises a parallel circuit of a manual / automatic control unit and a temperature sensor control unit, and the manual / automatic control unit comprises a circuit formed by connecting a manual control circuit and an automatic control circuit in parallel and then connecting the manual control circuit and the automatic control circuit in series with a contactor; the temperature sensor control unit comprises a parallel circuit of an upper limit temperature control circuit and a lower limit temperature control circuit. In the automatic mode, the pump station cooler can be started and stopped according to the upper limit value and the lower limit value set by the double-metal temperature switch under the condition that manual participation is not needed, the situation that the oil temperature is too high is avoided, and the phenomenon that the cooler is frequently started and stopped due to sensor misoperation caused by ship vibration and swing is avoided; and normal operation of the system can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of marine electronics, and in particular to a marine pump station cooler control circuit based on a bimetallic temperature sensor. Background Art

[0002] Many existing marine pump station coolers use bimetallic temperature sensors for automatic control, so that they can automatically start and stop within a certain temperature range. Due to the influence of the ship's tilt, sway and vibration, the pointer of the bimetallic temperature sensor is very easy to swing back and forth. When the pump station oil temperature pointer is near the moving contacts at both ends of the bimetallic temperature sensor, the swing of the pointer can easily cause the cooler temperature sensor to malfunction, including false contact and false disengagement, and cause the output control relay to repeatedly close and disconnect, resulting in abnormal start and stop of the pump station cooler, thereby affecting the normal function of the pump station cooler and threatening the safety of the hydraulic pump station. Summary of the invention

[0003] The purpose of the present invention is to provide a marine pump station cooler control circuit based on a bimetallic temperature sensor, so that the influence of ship vibration and swaying on the bimetallic temperature sensor will not cause the pump station cooler to start and stop repeatedly, thereby overcoming the defects existing in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention designs a control circuit of a marine pump station cooler based on a bimetallic temperature sensor, wherein the control circuit comprises a parallel circuit of a manual / automatic control unit and a temperature sensor control unit, wherein the manual / automatic control unit and the temperature sensor control unit are interconnected in parallel through a power supply line, wherein the manual / automatic control unit comprises a circuit in which a manual control circuit and an automatic control circuit are connected in parallel and then in series with a contactor, which refers to the main power supply of the contactor being connected in series, rather than a certain group of contacts therein; the temperature sensor control unit comprises a parallel circuit of an upper limit temperature control circuit and a lower limit temperature control circuit; The manual control circuit includes manual contacts of a cooler manual start button, a cooler manual stop button and a manual / automatic switching button connected in series; The automatic control circuit includes a group of normally open contacts of a first relay connected in series and an automatic contact of a manual / automatic switching button; The upper limit temperature control circuit includes a circuit in which the upper limit temperature contact (red and yellow contact) of the bimetallic temperature sensor is connected in parallel with another group of normally open contacts of the first relay, and then connected in series with the main power supply of the first relay and a group of normally closed contacts of the second relay; The lower limit temperature control circuit comprises a circuit in which the lower limit temperature contact of the bimetallic temperature sensor is connected in series with the main power supply of the second relay and another group of normally open contacts of the first relay.

[0005] Furthermore, the set temperature range of the bimetallic temperature sensor is greater than the temperature range indicated by the swing of the bimetallic temperature sensor pointer caused by the vibration and swaying of the ship.

[0006] Furthermore, the upper limit temperature is 55° C. and the lower limit temperature is 45° C., that is, when the oil temperature reaches the upper limit temperature, the cooler starts cooling, and when the oil temperature reaches the lower limit temperature, the cooler stops cooling.

[0007] Furthermore, the contactor controls whether the oil pump starts cooling by controlling the start and stop of the cooler motor. The manual / automatic control unit also includes a group of normally closed contacts of the circuit breaker connected in series with the contactor. Under normal conditions, the start and stop of the motor are completely controlled by the contactor. When overloaded, the circuit breaker starts and turns off the cooler motor. At the same time, the normally closed contacts are disconnected, and the cooler motor is no longer directly controlled by the contactor.

[0008] Furthermore, the manual control circuit also includes a group of normally open contacts of the contactor connected in parallel with the manual start button; the parallel connection is set here mainly to prevent the abnormal disconnection of the manual start button, that is, a self-locking function is added to the manual start button, unless the manual stop button is pressed, the cooler motor is always in the cooling working state.

[0009] Furthermore, a group of normally open contacts of the contactor are connected in series with the circuit breaker (Q1) to jointly control the power on and off of the pump station cooler.

[0010] Furthermore, the control circuit is installed in an electric control box body, the electric control box body is installed on the hull, and a shock absorbing device is provided to reduce the influence of ship vibration on the bimetallic sensor pointer.

[0011] Furthermore, the front of the electrical control box body is provided with a pump station cooler power supply voltage and current indicator, a cooler operation indicator light, a cooler start button, a pump station cooler stop button, and a pump station cooler manual / automatic start switching knob.

[0012] Furthermore, the cooler operation indicator light is connected in parallel with the pump station cooler and are jointly controlled by a group of normally open contacts of the contactor.

[0013] Another marine pump station cooler control circuit based on a bimetallic temperature sensor is characterized in that the control circuit includes a parallel circuit of a manual / automatic control unit and a temperature sensor control unit, the manual / automatic control unit and the temperature sensor control unit are interconnected in parallel through a power supply line, the manual / automatic control unit includes a manual control circuit and an automatic control circuit connected in parallel, and then connected in series with a contactor and a manual stop button of the cooler, respectively, which refers to the main power supply of the contactor in series, rather than a certain group of contacts therein; the temperature sensor control unit includes a parallel circuit of an upper limit temperature control circuit and a lower limit temperature control circuit; the control circuit also includes a manual / automatic start switching knob; The manual control circuit includes manual contacts of a manual start button of the cooler and a manual / automatic switching button connected in series; The automatic control circuit includes a group of normally open contacts of a first relay connected in series and an automatic contact of a manual / automatic switching button; The upper limit temperature control circuit includes a circuit in which the upper limit temperature contact point (red and yellow contact) of the bimetallic temperature sensor is connected in parallel with another group of normally open contacts of the first relay, and then connected in series with the main power supply of the first relay and a group of normally closed contacts of the second relay; The lower limit temperature control circuit includes a circuit in which the lower limit temperature contact (red and black contact) of the bimetallic temperature sensor is connected in series with the main power supply of the second relay and another group of normally open contacts of the first relay.

[0014] The advantages and beneficial effects of the present invention are as follows: the present invention mainly solves the problem of the bimetallic temperature sensor being mistakenly disengaged after contacting the moving contact, prevents the relay from being repeatedly attracted and disconnected, and thus avoids repeated start and stop of the pump station cooler. When the temperature is near the boundary endpoint (upper limit temperature or lower limit temperature point), due to the malfunction of the contact caused by the vibration and swaying of the ship, the conventional connection control circuit relay and the pump station cooler will have corresponding actions. The present invention can realize normal temperature control without manual intervention through the reasonable use of the self-locking circuit and the dual relay, and avoid the damage to the equipment caused by the repeated frequent start and stop of the cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a control circuit schematic diagram of a marine pump station cooler based on a bimetallic temperature sensor; Figure 2 This is the cooler motor connection schematic; Figure 3 It is a schematic diagram of the structure of the electric control box; Figure 4 It is another schematic diagram of the control circuit of a marine pump station cooler based on a bimetallic temperature sensor.

[0016] Markings in the figure: Contactor KM1, cooler manual start button S11E, cooler manual stop button S14E, manual / automatic switch button SA1, first relay KA1, second relay KA2, bimetallic temperature sensor SF1, cooler start / stop permission switch Q1. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Example 1

[0018] like Figure 1 As shown, a control circuit of a marine pump station cooler based on a bimetallic temperature sensor designed by the present invention, the control circuit includes a parallel circuit of a manual / automatic control unit and a temperature sensor control unit, the manual / automatic control unit and the temperature sensor control unit are connected in parallel through a power supply line (L1 and N1 shown in the figure, which can be a 220V AC power supply or a low-voltage DC power supply, and can control the start and stop of relays and contactors, and the cooler power supply is generally an AC mains power supply), the manual / automatic control unit includes a manual control circuit and an automatic control circuit connected in parallel, and then connected in series with a contactor KM1, where the series connection with the contactor refers to the connection in series with the main power supply of the contactor, i.e., the coil power supply, rather than a certain group of contacts therein; the temperature sensor control unit includes a parallel circuit of an upper limit temperature control circuit and a lower limit temperature control circuit; The manual control circuit includes a manual start button S11E (contacts 13 and 14) of the cooler, a manual stop button S14E (contacts 13 and 14) of the cooler, and a manual contact of a manual / automatic switching button SA1 connected in series. The manual contacts of the manual / automatic switching button (SA1) connected in series in the manual control circuit of this embodiment are (13 and 14). When the button is rotated to the manual state, the contacts 13 and 14 are closed, and the corresponding automatic control circuit series contacts 23 and 24 are disconnected, and the manual / automatic control unit enters the manual control state; when the manual / automatic switching button SA1 is in the manual state, the manual start button S11E is pressed, the contactor KM1 is energized, the cooler (motor) is started, and the system enters the cooling mode; The automatic control circuit comprises a group of normally open contacts (13, 14) of a first relay KA1 connected in series and automatic contacts (23, 24) of a manual / automatic switching button SA1; when the manual / automatic switching button SA1 is rotated to the automatic state, the contacts 23, 24 are closed, the corresponding manual control circuit series contacts 13, 14 are disconnected, the manual / automatic control unit enters the automatic control state, the start and stop of the cooler motor are automatically controlled by the first relay KA1, when KA1 is energized, its normally open contacts (13, 14) are closed, the contactor KM1 is energized, and the cooler motor starts; conversely, when KA1 loses power, its normally open contacts (13, 14) are disconnected, the contactor KM1 loses power, and the cooler motor stops; in the automatic control room state, the circuit controls the on and off of the contactor KM1 according to whether the first relay KA1 is energized (controlled by the temperature sensor control unit) and whether its group of normally open contacts (13, 14) are closed, and then controls whether the pump station cooler motor is energized or not through a group of contacts of the contactor KM1.

[0019] The upper limit temperature control circuit comprises a circuit in which the upper limit temperature contact (red and yellow contact) of the bimetallic temperature sensor SF1 is connected in parallel with another group of normally open contacts (33, 34) of the first relay KA1, and then connected in series with the main power supply (i.e., coil power supply, the same below) of the first relay KA1 and a group of normally closed contacts (21, 22) of the second relay KA2; The lower limit temperature control circuit comprises a circuit in which the lower limit temperature contact (red and black contact) of the bimetallic temperature sensor SF1 is connected in series with the main power supply of the second relay KA2 and another group of normally open contacts (43, 44) of the first relay KA1.

[0020] When the pump station cooler manual / automatic start switch button SA1 is turned to the automatic mode, the start and stop of the pump station cooler is controlled by the cooler temperature sensor. When the pump station oil temperature rises to the upper limit, the upper limit temperature contact (red and yellow contact) of the bimetallic temperature sensor SF1 is energized. Since the normally closed contacts (21, 22) of the second relay KA2 are in a closed state, the first relay KA1 energized coil is energized, and its normally open contacts (33, 34) are energized to form a self-locking. At this time, even if the upper limit temperature contact is disconnected due to the vibration and swaying of the ship, the power supply of KA1 and KM1 can still be maintained, that is, even if the bimetallic temperature pointer is affected by vibration and swings near the upper limit temperature moving contact (red and yellow contact), it will not cause the first relay KA1 to repeat the action); at the same time, since the normally open contacts (13, 14) of the first relay KA1 are also closed, the contactor KM1 coil is energized, the cooler motor starts to work, and the oil temperature starts to drop. The main function of the present invention is to prevent the cooler from frequently starting and stopping due to the vibration or swaying of the ship.

[0021] When the pointer of the bimetallic temperature sensor is near its upper limit temperature and the moving contact makes an accidental contact for the first time, the system will automatically enter the cooling state. This false contact does not need to be handled separately because it only occurs when the temperature is near the upper limit temperature. That is, the oil temperature should be in the high temperature area at this time, but it has not reached the set upper limit temperature and the cooler starts in advance. There will be no frequent start and stop phenomenon, and there will be no substantial impact on the normal operation of the entire system. When the oil temperature reaches the lower limit temperature, the system will still automatically shut down the cooler. To reduce the impact of the first false contact on the system, it is only necessary to appropriately expand the range of the upper limit temperature and the lower limit temperature, that is, appropriately increase the upper limit temperature and / or appropriately lower the lower limit temperature.

[0022] When the oil temperature drops from the upper limit but has not yet reached the lower limit, before the bimetallic temperature sensor pointer touches the lower limit temperature moving contact (red and black contact), because the first relay KA1 is self-locked, the KA1 coil continues to be energized (at this time, the KA2 normally closed contacts 21 and 22 are still closed), and the cooler motor continues to work.

[0023] When the oil temperature drops to the lower limit temperature, the corresponding moving contact (red and black contact) is energized. Since the first relay KA1 coil is still energized at this time, its normally open contacts (43, 44) are still in the closed state. Therefore, the second relay KA2 is energized, and then the normally closed contacts (21, 22) of KA2 in the upper limit temperature control circuit are disconnected, and then the first relay KA1 coil is de-energized, the cooler motor stops working, and the KA1 normally open contacts (43, 44) connected in series with the KA2 coil are disconnected, and the second relay KA2 coil is de-energized again. At this time, the bimetallic temperature sensor pointer is affected by vibration, even if it swings near the 45°C moving contact, it will not cause the KA2 relay to repeat the action. Similarly, the problem that the moving contact of the bimetallic temperature sensor pointer is accidentally contacted for the first time near its lower limit temperature due to unexpected reasons, as mentioned above, the problem that the moving contact is accidentally contacted for the first time near the upper limit temperature due to unexpected reasons is an acceptable problem or its impact can be reduced by expanding the upper and lower limit temperature range, and has no substantial impact on the normal operation of the entire system.

[0024] If the pump station oil temperature is less than or equal to the lower limit temperature, the lower limit temperature contact (red and black contact) of the bimetallic temperature sensor (SF1) is always in the energized state. At this time, the first relay KA1 coil is in the de-energized state, and its normally open contacts (43, 44) and (13, 14) are in the disconnected state. The second relay KA2 coil is not energized, and the contactor KM1 is not energized in the automatic control state, and the system maintains the status quo. At this time, even if the lower limit temperature contact (red and black contact) malfunctions due to ship vibration or swaying, the cooler will not operate.

[0025] Of course, the selection of the sensor and the setting of the temperature range should satisfy the requirements that the oil temperature will not accidentally contact the upper limit temperature moving contact in the low temperature zone (the high and low temperature zones are generally divided by the middle temperature between the upper limit temperature and the lower limit temperature) and will not accidentally contact the lower limit temperature moving contact in the high temperature zone.

[0026] Preferably, the set temperature range of the bimetallic temperature sensor is larger than the temperature range indicated by the swing of the bimetallic temperature sensor pointer caused by the vibration and swaying of the ship. Generally, it should be more than twice the temperature range indicated by the swing of the pointer. In this way, when the control circuit lacks an effective filtering or protection mechanism for the false contact between the pointer and the moving contact caused by the vibration or swaying of the ship, the system allows the existence of this first false contact problem, that is, the actual temperature control range may be smaller than the set temperature control range, which is acceptable, so there is this setting scheme. Of course, if the temperature control range required by the system is already very small, the swaying or vibration of the ship causes the abnormal movement of the pointer of the bimetallic temperature sensor to approach or even exceed the temperature range, or if the pointer swing range caused by the vibration or swaying of the ship is larger than the set temperature range, then this temperature control may lose its meaning, and it is necessary to replace a higher sensitivity temperature sensor (a sensor whose pointer movement is more sensitive to temperature) or expand the temperature control range to solve this problem.

[0027] Preferably, in this embodiment, the upper limit temperature of the pump station oil temperature control is set to 55°C and the lower limit temperature is set to 45°C, that is, when the oil temperature reaches the upper limit temperature, the cooler starts cooling, and when it reaches the lower limit temperature, the cooler stops cooling.

[0028] Preferably, Figure 2 As shown, the contactor KM1 controls whether the oil pump starts cooling by controlling the start and stop of the cooler motor. A group of normally open contacts (1, 2, 3, 4, 5, 6) of the contactor KM1 are connected in series with the circuit breaker Q1 to jointly control the power on and off of the pump station cooler motor.

[0029] Preferably, the marine pump station cooler control circuit is provided with an emergency start-stop permission switch Q2 (not shown in the figure), which is generally in a closed state. At this time, the start and stop of the motor are completely controlled by the contactor KM1. In an emergency, the cooler start-stop permission switch Q2 can be manually disconnected to turn off the cooler motor so that it is no longer directly controlled by the contactor KM1. The switch button is generally located on the system console; the emergency start-stop permission switch Q2 is arranged on the cooler motor power supply circuit, that is, it is connected in series with a group of normally open contacts (1, 2, 3, 4, 5, 6) of the contactor KM1 and the circuit breaker Q1, or it is arranged in a manual / automatic control unit and is in series with the main power supply coil of the contactor KM1. Example 2

[0030] The difference from Example 1 is that the manual / automatic control unit further comprises a group of normally closed contacts (11, 12) of the circuit breaker Q1 connected in series with the contactor KM1. Under normal conditions, the start and stop of the motor are completely controlled by the contactor KM1. When overloaded, the circuit breaker Q1 is started to turn off the cooler motor, and at the same time the normally closed contacts (11, 12) are disconnected, so that the cooler motor is no longer directly controlled by the contactor KM1. Example 3

[0031] The difference from Example 1 is that the manual control circuit also includes a group of normally open contacts (173, 174) of the contactor KM1 connected in parallel with the manual start button S11E; the parallel connection is provided here mainly to prevent abnormal disconnection of the manual start button S11E or contact jitter during manual start, that is, a self-locking function is added to the manual start button S11E. In the manual state, unless the manual stop button S14E is pressed or the cooler start and stop permission switch Q1 is turned off, the cooler motor is always in the cooling working state. Example 4

[0032] The difference from Example 1 is that the control circuit is installed in the electric control box body, the electric control box body is installed on the hull, and a shock absorbing device is provided to reduce the influence of the ship vibration on the bimetallic sensor pointer. Figure 3 shown.

[0033] Preferably, the front of the electrical control box body is provided with a pump station cooler power supply voltage and current indicator, a cooler operation indicator light, a cooler start button S11E, a pump station cooler stop button S14E, and a pump station cooler manual / automatic start switching knob SA1, which are arranged in sequence from left to right and from top to bottom in this embodiment.

[0034] Preferably, the cooler operation indicator light is connected in parallel with the pump station cooler and are jointly controlled by a group of normally open contacts of contactor KM1. Example 5

[0035] The difference from Example 1 is that Figure 4 As shown, the control circuit includes a parallel circuit of a manual / automatic control unit and a temperature sensor control unit, and the manual / automatic control unit and the temperature sensor control unit are interconnected in parallel through power supply lines (L1, N1 in the figure). The manual / automatic control unit includes a manual control circuit and an automatic control circuit connected in parallel, and then connected in series with a contactor KM1 and a manual stop button S14E (contacts 13, 14) of the cooler, respectively. Here, it refers to the main power supply of the contactor in series, rather than a certain group of contacts therein; the temperature sensor control unit includes a parallel circuit of an upper limit temperature control circuit and a lower limit temperature control circuit; The manual control circuit includes a manual start button S11E (contacts 13, 14) of the cooler and manual contacts (13, 14) of the manual / automatic switching button SA1 connected in series; The automatic control circuit comprises a group of normally open contacts (13, 14) of a first relay KA1 and automatic contacts (23, 24) of a manual / automatic switching button SA1 connected in series; The upper limit temperature control circuit comprises a circuit in which the upper limit temperature contact (red and yellow contact) of the bimetallic temperature sensor SF1 is connected in parallel with another group of normally open contacts (33, 34) of the first relay KA1, and then connected in series with the main power supply of the first relay KA1 and a group of normally closed contacts (21, 22) of the second relay KA2; The lower limit temperature control circuit comprises a circuit in which the lower limit temperature contact (red and black contact) of the bimetallic temperature sensor SF1 is connected in series with the main power supply of the second relay KA2 and another group of normally open contacts (43, 44) of the first relay KA1.

[0036] The main difference between this embodiment and embodiment 1 is that the manual stop button S14E of the cooler in this embodiment acts on the control circuit including the manual / automatic control unit and the temperature sensor control unit at the same time, while the manual stop button S14E of the cooler in embodiment 1 only acts on the manual control circuit.

[0037] In addition, the function of the emergency start-stop permission switch Q2 in Example 1 (the pump station cooler can be manually stopped in any state) can be replaced by S14E. Therefore, the emergency start-stop permission switch Q2 may no longer be provided in the preferred embodiment of this embodiment. However, there are still differences between the two, so Q2 is still retained in this embodiment. Other preferred designs of Example 1 are all applicable in this embodiment and are no longer described one by one.

[0038] The basic principle of the present invention is that the marine pump station cooler controlled by the bimetallic temperature sensor is easily affected by the tilt, sway and vibration of the ship, and its pointer contact is very easy to make false contact. The traditional bimetallic temperature sensor directly controls the control circuit connection of the start and stop of the cooler and easily causes the cooler to start and stop frequently, thereby affecting the normal function of the pump station cooler, and further threatening the use safety of the hydraulic pump station. The present invention realizes the normal control of the marine pump station cooler by the bimetallic temperature sensor through the relay self-locking circuit, the normally open and normally closed contacts of the dual relays and the main power supply in reasonable series and parallel connection, which can reduce or no longer be affected by the tilt, sway and vibration of the ship, and avoid the problem of frequent start and stop of the cooler.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical principles of the present invention, several improvements and modifications can be made, such as setting the temperature control range separately, and setting the emergency start-stop permission switch Q2 directly in series. Figure 2 In the cooler motor high-voltage circuit shown, preferred improvements are made to Example 5 based on Examples 1 to 4 and their preferred schemes, etc. These improvements and modifications should also be regarded as the protection scope of the present invention and will not be listed one by one here.

Claims

1. A marine pump station cooler control circuit based on a bimetallic temperature sensor, characterized in that: The control circuit includes a parallel circuit of a manual / automatic control unit and a temperature sensor control unit, wherein the manual / automatic control unit includes a circuit in which a manual control circuit and an automatic control circuit are connected in parallel and then connected in series with a contactor (KM1); the temperature sensor control unit includes a parallel circuit of an upper limit temperature control circuit and a lower limit temperature control circuit; The manual control circuit includes a manual contact of a cooler manual start button (S11E), a cooler manual stop button (S14E) and a manual / automatic switching button (SA1) connected in series; The automatic control circuit comprises a group of normally open contacts of a first relay (KA1) and an automatic contact of a manual / automatic switching button (SA1) connected in series; The upper limit temperature control circuit comprises a circuit in which the upper limit temperature contact of the bimetallic temperature sensor (SF1) is connected in parallel with a group of normally open contacts of the first relay (KA1), and then connected in series with the main power supply of the first relay (KA1) and a group of normally closed contacts of the second relay (KA2); The lower limit temperature control circuit comprises a circuit in which the lower limit temperature contact of the bimetallic temperature sensor (SF1) is connected in series with the main power supply of the second relay (KA2) and a group of normally open contacts of the first relay (KA1).

2. A marine pump station cooler control circuit based on a bimetallic temperature sensor according to claim 1, characterized in that: The set temperature range of the bimetallic temperature sensor is greater than the temperature range indicated by the swing of the bimetallic temperature sensor pointer caused by the vibration and swaying of the ship.

3. A marine pump station cooler control circuit based on a bimetallic temperature sensor according to claim 1, characterized in that: The upper limit temperature is 55°C, and the lower limit temperature is 45°C.

4. A marine pump station cooler control circuit based on a bimetallic temperature sensor according to claim 1, characterized in that: The manual / automatic control unit also includes a set of normally closed contacts of a circuit breaker (Q1) connected in series with the contactor (KM1).

5. A marine pump station cooler control circuit based on a bimetallic temperature sensor according to claim 1, characterized in that: The manual control circuit also includes a set of normally open contacts of a contactor (KM1) connected in parallel with the manual start button (S11E).

6. A marine pump station cooler control circuit based on a bimetallic temperature sensor according to claim 1, characterized in that: A group of normally open contacts of the contactor (KM1) is connected in series with the circuit breaker (Q1) to control the power on and off of the pump station cooler.

7. A marine pump station cooler control circuit based on a bimetallic temperature sensor according to claim 1, characterized in that: The control circuit is installed in the electric control box body, the electric control box body is installed on the hull, and a shock absorbing device is provided.

8. A marine pump station cooler control circuit based on a bimetallic temperature sensor according to claim 7, characterized in that: The front of the electric control box body is provided with a pump station cooler power supply voltage and current indicator, a cooler operation indicator light, a cooler start button (S11E), a pump station cooler stop button (S14E), and a pump station cooler manual / automatic start switching knob (SA1).

9. A marine pump station cooler control circuit based on a bimetallic temperature sensor according to claim 8, characterized in that: The cooler operation indicator light is connected in parallel with the pump station cooler and is controlled by a group of normally open contacts of the contactor (KM1).

10. A marine pump station cooler control circuit based on a bimetallic temperature sensor, characterized in that: The control circuit includes a parallel circuit of a manual / automatic control unit and a temperature sensor control unit, wherein the manual / automatic control unit includes a circuit in which the manual control circuit and the automatic control circuit are connected in parallel and then connected in series with a contactor (KM1) and a manual stop button (S14E) of the cooler; the temperature sensor control unit includes a parallel circuit of an upper limit temperature control circuit and a lower limit temperature control circuit; the control circuit also includes a manual / automatic start switching knob (SA1); The manual control circuit comprises manual contacts (13, 14) of a manual start button (S11E) of a cooler and a manual / automatic switching button (SA1) connected in series; The automatic control circuit comprises a group of normally open contacts of a first relay (KA1) and an automatic contact of a manual / automatic switching button (SA1) connected in series; The upper limit temperature control circuit comprises a circuit in which the upper limit temperature contact of the bimetallic temperature sensor (SF1) is connected in parallel with a group of normally open contacts of the first relay (KA1), and then connected in series with the main power supply of the first relay (KA1) and a group of normally closed contacts of the second relay (KA2); The lower limit temperature control circuit comprises a circuit in which the lower limit temperature contact of the bimetallic temperature sensor (SF1) is connected in series with the main power supply of the second relay (KA2) and a group of normally open contacts of the first relay (KA1).

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