CN111930157A - Constant temperature control system and method for interior of box type generator set - Google Patents

Abstract

The invention discloses an internal constant temperature control system of a box-type generator set and a method thereof. A box cover is covered outside the generator set, a temperature sensor is installed in the generator set, a heat dissipation pipe is installed outside the generator set, and a heat dissipation fan is installed on the generator set. On the main shaft of the unit, the cooling pipe is connected to the liquid cooling box through the circulating pump, the temperature sensor is connected to the control module, and the circulating pump and the cooling fan are connected to the control module through the PID controller. Beneficial effects of the present invention: The present invention is provided with a circulating pump, a box cover, a cooling pipe, a cooling fan, a liquid cooling box, a temperature sensor, a PID controller, a control module and an upper monitoring system; the temperature sensor can sense the internal temperature of the generator set through the control module Feedback to the upper monitoring system, through the PID controller feedback control the circulation pump work to adjust the internal temperature change of the generator set, if the temperature change exceeds the limit, the staff can be prompted through the alarm light and buzzer, so that the staff can immediately give feedback instructions.

Description

An internal constant temperature control system and method for a box-type generator set

technical field

The invention relates to the technical field of temperature control of generator sets, in particular to an internal constant temperature control system of a box-type generator set and a method thereof.

Background technique

A generator (English name: Generators) is a mechanical device that converts other forms of energy into electrical energy. It is driven by a water turbine, steam turbine, diesel engine or other power machinery to convert water flow, airflow, fuel combustion or nuclear fission. The energy generated by the fission is converted into mechanical energy It is transmitted to the generator, which is then converted into electricity by the generator. Generators are widely used in industrial and agricultural production, national defense, science and technology and daily life. There are many forms of generators, but their working principles are based on the law of electromagnetic induction and the law of electromagnetic force.

The machinery that converts mechanical energy into electrical energy is mostly composed of a rotor and a stator wound around a coil. Power machinery is used to drive the rotor to rotate to generate electrical energy. According to the nature of the generated current, it is divided into a DC generator and an AC generator; according to the different prime movers used, Sub-turbine generators, hydro-generators, diesel generators, etc.

Hydroelectric power generation has high efficiency, low power generation cost, quick start-up of units, and easy adjustment. Hydropower generation utilizes rivers, lakes and other water flows with potential energy located at high places to low places, and converts the potential energy contained in them into kinetic energy of the turbine, and then uses the turbine as the driving force. , push the generator to generate electricity, use the hydraulic power (with water head) to push the hydraulic machinery (turbine) to rotate, and convert the water energy into mechanical energy. At this time, mechanical energy is converted into electrical energy. In a sense, hydropower is a process in which the potential energy of water is converted into mechanical energy, and then into electrical energy. Because the voltage of the electricity generated by the hydroelectric power plant is low, it needs to be transmitted to the distance. For remote users, the voltage must be increased through the transformer, and then transmitted to the substation in the user concentrated area by the empty transmission line, and finally reduced to a voltage suitable for household users and factory electrical equipment, and transmitted by the distribution line to the substation. In factories and homes, the basic principle of hydroelectric power generation is to use the water level drop to cooperate with the hydro-generator to generate electricity, that is, to use the potential energy of the water to convert the mechanical energy of the water wheel, and then use the mechanical energy to drive the generator to obtain electricity.

During the working process of the generator set, heat will be generated. If the overheating is too high, it will affect the work of the generator set, thereby affecting the normal power generation work. Therefore, the internal temperature of the generator set needs to be monitored.

Therefore, it is necessary to propose an internal constant temperature control system and method for the box-type generator set for the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide an internal constant temperature control system for a box-type generator set and a method thereof.

An internal constant temperature control system of a box-type generator set of the present invention includes a circulating pump, a box cover, a cooling pipe, a cooling fan, a liquid cooling box, a temperature sensor, a PID controller, a control module and an upper monitoring system. The hood is outside the generator set, the temperature sensor is installed in the generator set, the heat dissipation pipe is laid on the outside of the generator set, the heat dissipation fan is installed on the main shaft of the generator set, and the heat dissipation pipe is installed on the main shaft of the generator set. The circulating pump is connected to the liquid cooling box, the temperature sensor is connected to the control module, the circulating pump and the cooling fan are connected to the control module through a PID controller, and the control module is electrically connected to the upper surveillance system;

Wherein, the PID controller adopts PID discrete algorithm, and the algorithm formula is:

为比例系数、

为积分时间常数、e（j）为给定值 与测量值之间差；

微分时间常数； In the formula: T is the adoption period, K is the sampling serial number;

is the proportional coefficient,

is the integral time constant, e(j) is the difference between the given value and the measured value;

Differential time constant;

u(k) is the output value of the computer at the Kth sampling time;

e(k) is the input deviation value at the Kth sampling time;

：积分系数

: integral coefficient

：微分系数；

: differential coefficient;

According to the Z transform properties:

;

;

The above formula is transformed into:

The Z transfer function of the digital PID controller is obtained as:

；

;

为调节器的输出量、

为控制器实际输出量； in

is the output of the regulator,

is the actual output of the controller;

The temperature sensor includes a sensor chip and an amplifier. The first pin of the sensor chip is grounded through a first capacitor, the second pin of the sensor chip is grounded, and the third pin of the sensor chip is connected to the ground. The second capacitor is grounded, the third pin of the sensing chip is connected to the non-inverting input terminal of the amplifier through the first resistor and the fourth resistor in sequence, and the inverting input terminal of the amplifier is grounded through the second resistor; There is a condenser at the bottom.

The cooling circulating fluid of the above-mentioned liquid-cooling box adopts liquid-cooling oil.

The above control module is also connected with a buzzer and an alarm light.

A third resistor is connected between the output end of the amplifier and the inverting input end, and a third capacitor and a fourth capacitor are connected between the output end of the amplifier and the first resistor.

The above-mentioned control method of the internal constant temperature control system of the box-type generator set, the specific method is: the generator set works, starts the upper monitoring system, reads the temperature fed back by the temperature sensor, and judges whether the temperature reaches the upper limit value, and if not, generates electricity The unit will continue to work; if so, start the circulating pump and the condenser, and the generator set will continue to work. If the temperature is above the upper limit for a long time, the alarm and warning light will work, and the control module will feed back to the upper monitoring system.

When the above-mentioned circulating pump is in operation, the circulating pump cools and dissipates the liquid cooling of the generator set by inputting the cooling circulating liquid of the liquid cooling box into the radiating pipe.

Beneficial effects of the present invention: the present invention is provided with a circulating pump, a box cover, a cooling pipe, a cooling fan, a liquid cooling box, a temperature sensor, a PID controller, a control module and an upper monitoring system; the temperature sensor can sense the internal temperature of the generator set and pass the control module. Feedback to the upper monitoring system, through the PID controller feedback to control the circulation pump work to adjust the internal temperature change of the generator set, if the temperature change exceeds the limit, the staff can be prompted through the alarm light and buzzer, so that the staff can immediately give feedback instructions.

The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, characteristics and effects of the present invention.

Description of drawings

Fig. 1 is the principle block diagram of the internal constant temperature control system of the box type generator set of the present invention;

Fig. 2 is the circuit diagram of the internal constant temperature control system of the box type generator set of the present invention;

3 is a flow chart of the module operation of the internal constant temperature control system of the box-type generator set of the present invention.

Detailed ways

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

As shown in Figure 1 and in conjunction with Figures 2 and 3, an internal constant temperature control system for a box-type generator set includes a circulating pump, a box cover, a cooling pipe, a cooling fan, a liquid cooling box, a temperature sensor, a PID controller, a control Module and upper monitoring system, the box cover is outside the generator set, the temperature sensor is installed in the generator set, the heat dissipation pipe is installed outside the generator set, and the heat dissipation fan is installed on the On the main shaft of the generator set, the cooling pipe is connected to the liquid cooling box through a circulating pump, the temperature sensor is connected to the control module, the circulating pump and the cooling fan are connected to the control module through a PID controller, The control module is electrically connected to the upper monitoring system;

The PID controller adopts the PID discrete algorithm, and the algorithm formula is:

In the formula: T is the adoption period, K is the sampling serial number;

u(k) is the output value of the computer at the Kth sampling time;

e(k) is the input deviation value at the Kth sampling time;

：积分系数

: integral coefficient

：微分系数；

: differential coefficient;

According to the Z transform properties:

；

;

The above formula is transformed into:

The Z transfer function of the digital PID controller can be obtained as:

。

.

Further, a condenser is provided at the bottom of the liquid cooling box.

Further, the cooling circulating fluid of the liquid cooling box adopts liquid cooling oil.

Further, the control module is also connected with a buzzer and an alarm light.

Further, the temperature sensor includes a sensing chip U1 and an amplifier Q1, the first pin of the sensing chip U1 is grounded through the first capacitor C1, the second pin of the sensing chip U1 is grounded, and the transmission The third pin of the sensing chip U1 is grounded through the second capacitor C2, and the third pin of the sensing chip U1 is connected to the non-inverting input terminal of the amplifier Q1 through the first resistor R1 and the fourth resistor R4 in turn. The phase input terminal is grounded through the second resistor R2.

Further, a third resistor R is connected between the output end of the amplifier Q1 and the inverting input end, and a third capacitor C3 and a fourth capacitor C4 are connected between the output end of the amplifier Q1 and the first resistor R1.

work process:

An internal constant temperature control method for a box-type generator set, the method steps are: the generator set works, starts an upper monitoring system, reads the temperature fed back by a temperature sensor, and judges whether the temperature reaches the upper limit value, and if not, the generator set continues to work; If so, start the circulating pump and condenser, and the generator set will continue to work. If the temperature is above the upper limit value for a long time, the alarm and warning light will start to work, and feedback to the upper monitoring system through the control module. The cooling circulating fluid of the tank is input into the radiating pipe for liquid cooling and heat dissipation of the generator set.

Based on the above, the present invention is provided with a circulating pump, a box cover, a cooling pipe, a cooling fan, a liquid cooling box, a temperature sensor, a PID controller, a control module and an upper monitoring system; The upper monitoring system uses the PID controller feedback to control the circulating pump to adjust the internal temperature change of the generator set. If the temperature change exceeds the limit, the staff can be reminded by the alarm light and buzzer, which is convenient for the staff to give feedback commands immediately.

The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the prior art according to the concept of the present invention shall fall within the protection scope determined by the claims.

Claims (6)

1. An internal constant temperature control system of a box-type generator set is characterized in that: comprising a circulating pump, a box cover, a cooling pipe, a cooling fan, a liquid cooling box, a temperature sensor, a PID controller, a control module and an upper-level monitoring system, so The box cover is outside the generator set, the temperature sensor is installed in the generator set, the heat dissipation pipe is laid on the outside of the generator set, the cooling fan is installed on the main shaft of the generator set, so The cooling pipe is connected to the liquid cooling box through a circulating pump, the temperature sensor is connected to the control module, the circulating pump and the cooling fan are connected to the control module through a PID controller, and the control module is electrically connected to the control module. the upper monitoring system; Wherein, the PID controller adopts PID discrete algorithm, and the algorithm formula is:

In the formula: T is the adoption period, K is the sampling serial number;

is the proportional coefficient,

is the integral time constant, e(j) is the difference between the given value and the measured value;

Differential time constant; u(k) is the output value of the computer at the Kth sampling time; e(k) is the input deviation value at the Kth sampling time;

: integral coefficient

: differential coefficient; According to the Z transform properties:

; The above formula is transformed into:

The Z transfer function of the digital PID controller is obtained as:

; in

is the output of the regulator,

is the actual output of the controller; The temperature sensor includes a sensor chip and an amplifier. The first pin of the sensor chip is grounded through a first capacitor, the second pin of the sensor chip is grounded, and the third pin of the sensor chip is connected to the ground. The second capacitor is grounded, the third pin of the sensing chip is connected to the non-inverting input terminal of the amplifier through the first resistor and the fourth resistor in sequence, and the inverting input terminal of the amplifier is grounded through the second resistor; There is a condenser at the bottom. 2 . The internal constant temperature control system of a box-type generator set according to claim 1 , wherein the cooling circulating liquid of the liquid-cooling box adopts liquid-cooled oil. 3 . 3 . The internal constant temperature control system of a box-type generator set according to claim 1 , wherein the control module is further connected with a buzzer and an alarm light. 4 . 4. The internal constant temperature control system of a box-type generator set according to claim 1, wherein a third resistor is connected between the output end of the amplifier and the inverting input end, and the output end of the amplifier is connected with a third resistor. A third capacitor and a fourth capacitor are connected with the first resistor. 5. A control method for the internal constant temperature control system of a box-type generator set according to any one of claims 1-4, wherein the specific method is: the generator set works, starts the upper monitoring system, reads the The temperature fed back by the temperature sensor determines whether the temperature reaches the upper limit. If not, the generator set continues to work; if so, the circulating pump and condenser are started, and the generator set continues to work. If the temperature is above the upper limit for a long time, the alarm and warning light Work, and feedback to the upper monitoring system through the control module. 6. The internal constant temperature control method of a box-type generator set according to claim 5, characterized in that: when the circulating pump is in operation, the circulating pump feeds the cooling circulating liquid of the liquid-cooling box into the radiating pipe, so as to cool the liquid of the generator set. Cool cooling.

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