阅读说明：本技术 一种提高机组负荷稳定性的负荷控制方法、装置及机组 (Load control method and device for improving load stability of unit and unit ) 是由 覃业星 黄凯亮 刘思源 林少丹 于 2019-10-14 设计创作，主要内容包括：本发明公开一种提高机组负荷稳定性的负荷控制方法、装置及机组。其中,该方法包括：监测机组末端负荷是否处于偏低状态；在所述负荷处于偏低状态时,执行卸载控制操作；在执行卸载控制操作后如果所述负荷仍处于偏低状态,则控制电磁阀的动作以减小机组冷凝器换热面积；其中,所述电磁阀设置在风冷冷凝器组件之间。通过本发明,当工程需要机组开机,但是负荷情况较小时,主机根据实际情况进行卸载控制,还可以进一步减小机组翅片换热面积,减小冷凝换热量,从而提升整机运行范围,保证机组稳定运行,有效防止机组频繁启停出现,保护压缩机,提升机组使用寿命。(The invention discloses a load control method, a load control device and a unit for improving the load stability of the unit. Wherein, the method comprises the following steps: monitoring whether the load at the tail end of the unit is in a low state; when the load is in a low state, executing unloading control operation; after the unloading control operation is executed, if the load is still in a low state, the action of the electromagnetic valve is controlled to reduce the heat exchange area of the condenser of the unit; wherein the solenoid valve is disposed between the air-cooled condenser assemblies. According to the invention, when the unit is required to be started in a project but the load condition is smaller, the host machine carries out unloading control according to the actual condition, and can further reduce the heat exchange area of the unit fins and reduce the condensation heat exchange quantity, thereby improving the operation range of the whole machine, ensuring the stable operation of the unit, effectively preventing the unit from being frequently started and stopped, protecting the compressor and prolonging the service life of the unit.)

1. A method of load control, the method comprising:

monitoring whether the load at the tail end of the unit is in a low state;

when the load is in a low state, executing unloading control operation;

after the unloading control operation is executed, if the load is still in a low state, the action of the electromagnetic valve is controlled to reduce the heat exchange area of the condenser of the unit; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.

2. The method of claim 1, wherein monitoring whether the unit end load is in a low state comprises:

monitoring the water supply temperature and the water return temperature of the unit chilled water;

and judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature.

3. The method according to claim 1, wherein judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and a preset water outlet temperature comprises:

calculating the temperature difference of inlet and outlet water; wherein, the temperature difference between the inlet water and the outlet water is equal to the return water temperature-the water supply temperature;

and if the temperature difference between the inlet water and the outlet water is less than or equal to a preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature + temperature deviation value, judging that the load is in a low state.

4. The method of claim 1, wherein performing an offload control operation comprises:

reducing the load to less than or equal to: and presetting the minimum load + the load deviation value.

5. The method of claim 1, wherein controlling the actuation of the solenoid valve to reduce the unit condenser heat transfer area comprises:

monitoring real-time high-pressure on a pipeline between a compressor and an air-cooled condenser assembly;

and controlling the action of the electromagnetic valve according to the real-time high-pressure.

6. The method of claim 5, wherein controlling the actuation of the solenoid valve based on the real-time high pressure comprises:

if the real-time high-pressure is less than or equal to the pressure threshold value, controlling the electromagnetic valve to be closed;

and if the real-time high-pressure is larger than the pressure threshold value, controlling the electromagnetic valve to be kept open, and waiting for the unit to stand by.

7. A load control device, characterized in that the device comprises:

the state monitoring module is used for monitoring whether the load at the tail end of the unit is in a low state;

the unloading control module is used for executing unloading control operation when the load is in a low state;

the load adjusting module is used for controlling the action of the electromagnetic valve to reduce the heat exchange area of the condenser of the unit if the load is still in a low state after the unloading control operation is executed; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.

8. The apparatus of claim 7, wherein the condition monitoring module comprises:

the temperature monitoring unit is used for monitoring the water supply temperature and the water return temperature of the unit chilled water;

and the judging unit is used for judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature.

9. The apparatus of claim 7,

the judging unit is specifically used for calculating the temperature difference of inlet and outlet water; wherein, the temperature difference between the inlet water and the outlet water is equal to the return water temperature-the water supply temperature; and if the temperature difference between the inlet water and the outlet water is less than or equal to a preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature + temperature deviation value, judging that the load is in a low state.

10. The apparatus of claim 7,

the unloading control module is specifically configured to reduce the load to be less than or equal to: and presetting the minimum load + the load deviation value.

11. The apparatus of claim 7, wherein the load adjustment module comprises:

the pressure monitoring unit is used for monitoring real-time high-pressure on a pipeline between the compressor and the air-cooled condenser assembly;

and the control unit is used for controlling the action of the electromagnetic valve according to the real-time high-pressure.

12. An assembly, characterized in that it comprises a load control device according to any one of claims 7 to 11.

13. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 6.

Technical Field

The invention relates to the technical field of units, in particular to a load control method and device for improving load stability of a unit and the unit.

Background

The air-cooled screw unit is widely applied to places such as offices, superstores, hospitals and the like at present, and has a wide market application range.

The unit needs to be used in linkage with the engineering, and the running condition of the main machine is closely related to the actual condition of the engineering. When the load of the project is smaller and lower than the minimum load provided by the whole machine, the operation of the host machine cannot be stable, so that the phenomenon that the unit is frequently started and stopped and the like can occur.

Aiming at the problem that the unit cannot stably run due to the fact that the load is too small in the prior art, an effective solution is not provided at present.

Disclosure of Invention

The embodiment of the invention provides a load control method, a load control device and a unit for improving the load stability of the unit, and aims to solve the problem that the unit cannot stably run due to too small load in the prior art.

In order to solve the above technical problem, the present invention provides a load control method, wherein the method includes: monitoring whether the load at the tail end of the unit is in a low state; when the load is in a low state, executing unloading control operation; after the unloading control operation is executed, if the load is still in a low state, the action of the electromagnetic valve is controlled to reduce the heat exchange area of the condenser of the unit; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.

Further, whether monitoring unit end load is in the state of leaning on low, include: monitoring the water supply temperature and the water return temperature of the unit chilled water; and judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature.

Further, according to the water supply temperature, the water return temperature and a preset water outlet temperature, whether the load at the tail end of the unit is in a low state is judged, and the method comprises the following steps: calculating the temperature difference of inlet and outlet water; wherein, the temperature difference between the inlet water and the outlet water is equal to the return water temperature-the water supply temperature; and if the temperature difference between the inlet water and the outlet water is less than or equal to a preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature + temperature deviation value, judging that the load is in a low state.

Further, performing an unload control operation, comprising: reducing the load to less than or equal to: and presetting the minimum load + the load deviation value.

Further, the action of control solenoid valve is in order to reduce unit condenser heat transfer area, includes: monitoring real-time high-pressure on a pipeline between a compressor and an air-cooled condenser assembly; and controlling the action of the electromagnetic valve according to the real-time high-pressure.

Further, the action of the electromagnetic valve is controlled according to the real-time high-pressure, and the action comprises the following steps: if the real-time high-pressure is less than or equal to the pressure threshold value, controlling the electromagnetic valve to be closed; and if the real-time high-pressure is larger than the pressure threshold value, controlling the electromagnetic valve to be kept open, and waiting for the unit to stand by.

The present invention also provides a load control device, characterized in that the device comprises: the state monitoring module is used for monitoring whether the load at the tail end of the unit is in a low state; the unloading control module is used for executing unloading control operation when the load is in a low state; the load adjusting module is used for controlling the action of the electromagnetic valve to reduce the heat exchange area of the condenser of the unit if the load is still in a low state after the unloading control operation is executed; wherein the solenoid valve is disposed between the air-cooled condenser assemblies.

Further, the status monitoring module includes: the temperature monitoring unit is used for monitoring the water supply temperature and the water return temperature of the unit chilled water; and the judging unit is used for judging whether the load at the tail end of the unit is in a low state or not according to the water supply temperature, the water return temperature and the preset water outlet temperature.

Further, the judging unit is specifically configured to calculate a temperature difference between inlet and outlet water; wherein, the temperature difference between the inlet water and the outlet water is equal to the return water temperature-the water supply temperature; and if the temperature difference between the inlet water and the outlet water is less than or equal to a preset difference value, and the water supply temperature is less than or equal to the preset outlet water temperature + temperature deviation value, judging that the load is in a low state.

Further, the unloading control module is specifically configured to reduce the load to be less than or equal to: and presetting the minimum load + the load deviation value.

Further, the load adjustment module includes: the pressure monitoring unit is used for monitoring real-time high-pressure on a pipeline between the compressor and the air-cooled condenser assembly; and the control unit is used for controlling the action of the electromagnetic valve according to the real-time high-pressure.

The invention also provides a machine set which is characterized by comprising the load control device.

The invention also provides a computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the method as described above.

By applying the technical scheme of the invention, when the unit is started up in engineering needs, but the load condition is smaller, the host machine carries out unloading control according to the actual condition, and can further reduce the heat exchange area of the unit fins and reduce the condensation heat exchange quantity, thereby improving the operation range of the whole machine, ensuring the stable operation of the unit, effectively preventing the unit from being frequently started and stopped, protecting the compressor and prolonging the service life of the unit.

Drawings

FIG. 1 is a flow chart of a load control method according to an embodiment of the invention;

FIG. 2 is a system block diagram of an air-cooled screw unit according to an embodiment of the present invention;

wherein: 1-a compressor, 2-a pressure sensor, 3-an air-cooled condenser assembly, 4-a ball valve, 5-a drying filter, 6-an energy saver, 7-a throttling device, 8 a-a chilled water supply temperature sensing bulb, 8 b-a chilled water return temperature sensing bulb, 9-an electromagnetic valve, 10-a one-way valve and 11-a shell and tube heat exchanger;

fig. 3 is a block diagram of a load control device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.

Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.