CN213955702U

CN213955702U - Energy-saving control device of refrigerating unit

Info

Publication number: CN213955702U
Application number: CN202022920226.7U
Authority: CN
Inventors: 秦通; 刘建超; 李鹏春; 张波
Original assignee: Valiant Co Ltd
Current assignee: Valiant Co Ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-08-13
Anticipated expiration: 2030-12-07

Abstract

The utility model relates to a control system specifically is an energy-saving control device of refrigerating unit, including the circulating pump, the circulating pump is installed on the feed liquor pipeline between refrigerating unit and the refrigerant storage tank, installs first temperature transmitter on the refrigerant storage tank, installs second temperature transmitter on the feed liquor pipeline between refrigerating unit and refrigerant storage tank, installs third temperature transmitter on the liquid return pipeline between refrigerating unit and refrigerant storage tank, and the control circulating pump increases first auxiliary contact on opening the contactor that stops, and first temperature transmitter passes through intelligent PID temperature controller and links to each other with first auxiliary contact. Compared with the prior art, the utility model discloses energy-conserving effect is obvious.

Description

Energy-saving control device of refrigerating unit

Technical Field

The utility model relates to a control system specifically is an energy-saving control device of refrigerating unit, but the wide application is in the refrigerating unit of taking refrigerant circulation system.

Background

The refrigerating unit utilizes a compressor, an evaporator and the like to cool a specific refrigerant medium, thereby meeting the requirements of low-temperature refrigerants in industrial production. The refrigerating unit needs continuous circulation of a refrigerant when in operation, the refrigerating unit can automatically operate or stop according to the temperature of a medium of a supply and return pipeline at present, but a power system participating in refrigerant circulation cannot automatically control start and stop, and the circulating pump can only operate for 24 hours in the current technical scheme. This technical scheme causes great energy waste.

Disclosure of Invention

The utility model discloses the system aims at reducing the extravagant problem of the energy of refrigerating unit in practical application, optimizes unit operation procedure simultaneously, increases circulating pump operation timing. The safety performance, the energy-saving effect and the stable operation of the refrigerating unit are guaranteed. Therefore, the utility model adopts the technical scheme that:

the utility model provides an energy-saving control device of refrigerating unit, includes the circulating pump, and the circulating pump is installed on the liquid supply pipeline between refrigerating unit and refrigerant storage tank, its characterized in that: install first temperature transmitter on the refrigerant storage tank, install second temperature transmitter on the liquid supply pipe between refrigerating unit and refrigerant storage tank, install third temperature transmitter on the liquid return pipe between refrigerating unit and refrigerant storage tank, increase first auxiliary contact on the contactor that the control circulating pump opened and stops, first temperature transmitter links to each other with first auxiliary contact through intelligent PID temperature controller.

Furthermore, a flow switch is installed on a liquid supply pipeline between the refrigerating unit and the refrigerant storage tank, a second auxiliary contact and a time relay are added on the contactor for controlling the starting and stopping of the refrigerating unit, and the flow switch is connected with the second auxiliary contact through a PLC (programmable logic controller) of the refrigerating unit.

Furthermore, a timer for recording the running time of the circulating pump and/or the refrigerating unit is also included.

Furthermore, the device also comprises a change-over switch for controlling the running state of the circulating pump.

Furthermore, the device also comprises indicator lights which respectively indicate the running state of the circulating pump and the running state of the unit.

Compared with the prior art, the utility model discloses following beneficial technological effect has:

1. utilize the utility model discloses, the circulation system of refrigerating unit opens or closes according to the actual demand, no longer is the state of opening in 24 hours to energy-conserving effect has been reached. Through measurement, the utility model discloses can save energy about 1/3. Taking a 200KW refrigerating unit as an example, the power of a circulating pump is about 45KW, and the electricity cost can be saved by 95922 yuan per year by calculating at 0.73 yuan/degree;

2. by utilizing the utility model, the refrigerating unit can be stopped when reporting faults under the condition of no refrigerant circulation, thereby preventing the unit from being damaged due to the reasons of freezing of the compressor and the like;

3. utilize the utility model discloses, can measure the operating time of circulating pump, for work such as the dimension of equipment guarantor provides the guarantee.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Embodiment 1, as shown in fig. 1, an energy-saving control device for a refrigerating unit, including a circulating pump 1, the circulating pump 1 is installed on a liquid supply pipeline between a refrigerating unit 2 and a refrigerant storage tank 3, a first temperature transmitter 41 is installed on the refrigerant storage tank 3, a second temperature transmitter 42 is installed on the liquid supply pipeline between the refrigerating unit 2 and the refrigerant storage tank 3, a third temperature transmitter 43 is installed on a liquid return pipeline between the refrigerating unit 2 and the refrigerant storage tank 3, a first auxiliary contact is added on a contactor for controlling the starting and stopping of the circulating pump 1, and the first temperature transmitter 41 is connected with the first auxiliary contact through an intelligent PID temperature controller 5. A liquid supply pipeline and a liquid return pipeline are also arranged between the refrigerant storage tank 3 and the workshop 8, a second circulating pump 7 is connected to the liquid supply pipeline in series, and heat exchange can be realized between the workshop 8 and the refrigerant storage tank 3. The system also comprises a change-over switch, a timer for recording the running time of the circulating pump 1, the change-over switch for controlling the running state of the circulating pump, and indicator lights for respectively indicating the running state of the circulating pump and the running state of the unit.

Gather the real-time temperature of refrigerant storage tank through temperature transmitter, through intelligent PID temperature controller interlock to the circulating pump, when the temperature is higher than the temperature of settlement like-13 ℃ (this temperature can be according to conditions such as refrigerant type, refrigerator group setting and adjust), the circulating pump is automatic to be opened. The automatic control of the pump is realized by utilizing the contactor of the original circulating pump and by adding an auxiliary contact. The change-over switch is divided into three gears, namely manual, stop and automatic. The original control button can be directly used for controlling in a manual state; the machine can be forcibly stopped when the machine is in a stop state; when the system is in an automatic state, the system can automatically run. The indicator lights respectively indicate the running state of the circulating pump and the running state of the unit. The timer can measure the accumulated running time of the circulating pump, and guarantees are provided for the maintenance and the like of the equipment.

Since the refrigerant storage tank participates in the workshop circulation, the temperature of the first temperature transmitter 41 on the storage tank rises quickly, and the refrigerating unit judges whether the starting condition is met or not according to the second temperature transmitter 42 carried by the liquid supply pipeline. After the circulation pump stops operating, the temperature rising speed of the first temperature transmitter 41 is greater than that of the second temperature transmitter 42, and the circulation pump starts operating in advance of the refrigerating unit in theory, thus providing an on condition for the refrigerating unit. After the circulating pump is started, the pipeline refrigerant starts to circulate, the temperature rising speed of the second temperature transmitter 42 is increased until the starting condition of the refrigerating unit is reached, the refrigerating unit is started, and the system starts to operate. When the temperature of the second temperature transmitter 42 is reduced to a set value, the refrigerating unit is stopped, the time relay starts to work, and when the set time is reached, the auxiliary contact of the circulating pump contactor acts, the circulating pump stops running, and the system stops working.

The embodiment 2 is otherwise the same as the embodiment 1, except that a flow switch 6 is installed on a liquid supply pipeline between the refrigerating unit 2 and the refrigerant storage tank 3, a second auxiliary contact and a time relay are added on a contactor for controlling the starting and stopping of the refrigerating unit 2, and the flow switch 6 is connected with the second auxiliary contact through a PLC of the refrigerating unit. So that the refrigerating unit cannot be started under the condition that the pipeline has no flow. The refrigerating unit can be stopped when the refrigerating unit fails under the condition of no refrigerant circulation, so that the unit damage caused by the freezing of the compressor and the like is prevented. It should be noted that, in the embodiment, the original PLC program of the refrigerating unit needs to be optimized, and when the unit is normally stopped, the PLC does not detect the flow state any more, but detects the flow state 10 seconds before the unit is started, so as to prevent the system from reporting faults when the unit and the circulating pump are normally stopped.

Claims

1. The utility model provides an energy-saving control device of refrigerating unit, includes circulating pump (1), and circulating pump (1) is installed on the liquid supply pipeline between refrigerating unit (2) and refrigerant storage tank (3), its characterized in that: install first temperature transmitter (41) on refrigerant storage tank (3), increase first auxiliary contact on the contactor that control circulating pump (1) opened and stop, first temperature transmitter (41) link to each other with first auxiliary contact through intelligent PID temperature controller (5).

2. The energy-saving control device of a refrigerating unit according to claim 1, characterized in that: a flow switch (6) is installed on a liquid supply pipeline between the refrigerating unit (2) and the refrigerant storage tank (3), a second auxiliary contact and a time relay are added on a contactor for controlling the starting and stopping of the refrigerating unit (2), and the flow switch (6) is connected with the second auxiliary contact through a PLC (programmable logic controller) of the refrigerating unit.

3. The energy-saving control device of a refrigerating unit according to claim 1, characterized in that: and a timer for recording the running time of the circulating pump (1) and/or the refrigerating unit (2).

4. The energy-saving control device of a refrigerating unit according to claim 1, characterized in that: the circulating pump control system also comprises a change-over switch for controlling the running state of the circulating pump.

5. The energy-saving control device of a refrigerating unit according to claim 1, characterized in that: the device also comprises indicator lights which respectively indicate the running state of the circulating pump and the running state of the unit.