CN108377628B - Control method and device for cooling fan of electric control cabinet of chiller - Google Patents

Abstract

The invention discloses a control method of a cooling fan of an electric control cabinet of a chiller, and belongs to the technical field of refrigeration equipment. The control method includes: acquiring the outdoor temperature; comparing the outdoor temperature with a preset external temperature threshold; controlling the operation of the cooling fan in response to the first comparison result that the outdoor temperature is greater than or equal to the external temperature threshold; and in response to the outdoor temperature being less than the external temperature The second comparison result of the threshold value and the detection result that the chiller is in the running state are used to control the operation of the cooling fan. The control method provided by the invention selects the control parameters by utilizing the external environment parameters and the operating characteristics of the unit itself, so as to realize the start-stop control of the cooling fan, without adding additional control components, with high reliability and good control performance.

Description

Control method and device for cooling fan of electric control cabinet of chiller

technical field

The invention relates to the technical field of refrigeration equipment, in particular to a control method and device for a cooling fan of an electric control cabinet of a chiller.

Background technique

As a large-scale refrigeration equipment, the chiller contains many electrical components in its electric control cabinet. Especially in recent years, with the large-scale application of variable frequency refrigeration components such as variable frequency compressors and variable frequency water pumps, various types of frequency converters have been configured. There are more and more electric control cabinets for reactors and filters. This puts forward higher requirements for the heat dissipation of the electric control cabinet. Since the heat dissipation of the electric control cabinet is usually carried out by the cooling fan, how to improve the utilization rate of the fan heating fan and prolong the service life of the cooling fan as much as possible has become an increasingly important topic.

Since the installation environment of the chiller is relatively harsh (usually on the roof or in a closed computer room), in order to ensure reliable heat dissipation of the electric control cabinet, there are two commonly used control methods for the cooling fan of the electric control cabinet:

1. For long-term operation, the cooling fan is directly connected to the power supply. As long as the unit is powered on, the fan will start to run;

2. Using thermostat control, this solution is to add a thermostat (or temperature relay) to the fan control loop to set a temperature. When the temperature in the cabinet reaches the set temperature, the normally open contact of the thermostat is closed. , turn on the cooling fan control circuit, the fan starts to work. When the temperature in the cabinet is lower than the set temperature, the normally open contact of the thermostat is disconnected, and the fan stops running.

The disadvantage of scheme 1 is that the cooling fan does not necessarily need to operate for a long time. For example, in winter, when the unit is not running or when the operating temperature of the unit reaches the water temperature setting for temporary standby, the ambient temperature of the electric control cabinet is already very low. In fact, there is no need to turn on the cooling fan to dissipate heat. At this time, the cooling fan keeps running continuously. These invalid running times not only reduce the service life of the fan (the service life of the cooling fan is usually constant, the nominal value is about 30,000 hours, and the invalid running time will consume a large part of the use of the fan). life time), and in the case of individual high humidity, longer fan operation time will increase the air humidity in the electric control cabinet and reduce the service life of electrical components.

The disadvantage of solution 2 is that a component such as a thermostat is added to the fan control circuit, and the addition of components will naturally lead to a decrease in circuit reliability and an increase in cost. Moreover, the thermostat can only detect the temperature in its vicinity, which may not reflect the real situation of the overall temperature in the electric control cabinet. Therefore, the installation position of the thermostat also needs to be considered, which also brings additional difficulties to the design of the electric control cabinet.

SUMMARY OF THE INVENTION

The invention provides a control method and device for a cooling fan of an electric control cabinet of a chiller, aiming to solve the problem that the control scheme of the cooling fan of a conventional chiller affects its service life or increases the manufacturing cost. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be an extensive review, nor is it intended to identify key/critical elements or delineate the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the detailed description that follows.

According to a first aspect of the present invention, a method for controlling a cooling fan of an electric control cabinet of a chiller is provided, the control method comprising:

Get the outdoor temperature;

Compare the outside temperature with a preset outside temperature threshold;

In response to the first comparison result that the outdoor temperature is greater than or equal to the outdoor temperature threshold, controlling the operation of the cooling fan; and

In response to the second comparison result that the outdoor temperature is less than the outdoor temperature threshold and the detection result that the chiller is in an operating state, the cooling fan is controlled to operate.

In an optional embodiment, responding to the detection result that the chiller is in the running state, including:

Detect the start-stop status of the functional components of the chiller, including: fans and compressors of the chiller;

When at least one of the functional components is in an enabled state, a detection result that the chiller is in a running state is obtained.

In an optional embodiment, the control method further includes:

Detecting the start-stop state of the functional components of the chiller when the cooling fan is running in response to the second comparison result and the detection result, the functional components include: a fan, a compressor and a cooling pump of the chiller;

When the functional components are in the shutdown state, the cooling fan is controlled to shutdown.

In an optional embodiment, the cold pump includes a cooling pump and a freezing pump.

In an optional implementation manner, the value range of the external temperature threshold is 30°C to 35°C.

According to a second aspect of the present invention, there is also provided a control device for a cooling fan of an electric control cabinet of a chiller, the control device comprising:

The acquisition unit is used to acquire the outdoor temperature;

a comparison unit for comparing the outdoor temperature with a preset outdoor temperature threshold;

a first response unit, configured to control the operation of the cooling fan in response to the first comparison result that the outdoor temperature is greater than or equal to the outdoor temperature threshold;

The second response unit is configured to control the operation of the cooling fan in response to the second comparison result that the outdoor temperature is less than the outside temperature threshold and the detection result that the chiller is in an operating state.

In an optional implementation manner, the second response unit is specifically used for:

Detect the start-stop status of the functional components of the chiller, including: fans and compressors of the chiller;

When at least one of the functional components is in an enabled state, a detection result that the chiller is in a running state is obtained.

In an optional embodiment, the control device further includes:

a detection unit, configured to detect the start-stop state of the functional components of the chiller when the cooling fan is running in response to the second comparison result and the detection result, the functional components include: a fan, a compressor and a cooling pump of the chiller;

The shutdown unit is used to control the cooling fan to stop when the functional components are in the shutdown state.

In an optional embodiment, the cold pump includes a cooling pump and a freezing pump.

In an optional implementation manner, the value range of the external temperature threshold is 30°C to 35°C.

The present invention adopts the above-mentioned technical scheme to have beneficial effects as follows:

The control method provided by the invention selects the control parameters by utilizing the external environment parameters and the operating characteristics of the unit itself, so as to realize the start-stop control of the cooling fan, without adding additional control components, with high reliability and good control performance.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a flow chart 1 of a control method for a cooling fan of an electric control cabinet of a chiller according to an exemplary embodiment of the present invention;

FIG. 2 is a second flow chart of the control method of the cooling fan of the electric control cabinet of the chiller according to an exemplary embodiment of the present invention;

Fig. 3 is a structural block diagram of a control device for a cooling fan of an electric control cabinet of a chiller according to an exemplary embodiment of the present invention.

Detailed ways

The following description and drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible variations. Unless expressly required, individual components and functions are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the invention includes the full scope of the claims, along with all available equivalents of the claims. Various embodiments may be referred to herein by the term "invention," individually or collectively, for convenience only, and are not intended to automatically limit the scope of this application to any if more than one invention is in fact disclosed. A single invention or inventive concept. Herein, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation and do not require or imply any actual relationship between these entities or operations or order. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method or apparatus comprising a list of elements includes not only those elements, but also others not expressly listed elements, or also include elements inherent to such a process, method or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, or device that includes the element. The various embodiments herein are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and it is sufficient to refer to each other for the same and similar parts between the various embodiments. For the methods, products, etc. disclosed in the embodiments, since they correspond to the method parts disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

FIG. 1 is a flow chart 1 of a method for controlling a cooling fan in an electric control cabinet of a chiller according to an exemplary embodiment of the present invention.

As shown in FIG. 1 , the present invention provides a control method for the cooling fan of the electric control cabinet of the water chiller, which can be applied to the start and stop of the cooling fan of the electric control cabinet of the water chiller. Specifically, the control method includes:

S101. Obtain the outdoor temperature;

In this embodiment, in this embodiment, the outdoor unit of the air conditioner is configured with a temperature sensor, and the temperature sensor can be used to detect the current temperature parameter of the outdoor environment. to the current temperature parameter, and as the outdoor temperature.

Alternatively, the air conditioner of the present invention is connected to an external network through a home local area network, and the outdoor environment data corresponding to the coordinate position of the air conditioner can be searched from the server of the air conditioner product service provider or the network platform that provides weather data information, and the outdoor environment data includes: The current temperature parameter of the outdoor environment. In this way, in step S101, the current temperature parameter of the outdoor environment obtained by searching can be used as the outdoor temperature.

S102, comparing the outdoor temperature with a preset external temperature threshold;

In this embodiment, the air conditioner pre-stores one or more external temperature thresholds, and the external temperature thresholds can be used to represent the corresponding critical temperature values of the influence of the outdoor ambient temperature on the electric control cabinet of the chiller. When the measured outdoor temperature is greater than When it is equal to or equal to the external temperature threshold, the outdoor temperature has a great adverse effect on the electric control cabinet. The external temperature causes the temperature of the internal environment of the electric control cabinet to rise, and the electronic control components are easily overheated and burnt and damaged. When it is less than the external temperature threshold, the adverse effect of the outdoor temperature on the frost condensation stage of the air conditioner is small, and the temperature of the internal environment of the electric control cabinet is generally maintained within a relatively safe temperature range.

Preferably, the value range of the external temperature threshold is 30-35°C.

S103. In response to the first comparison result that the outdoor temperature is greater than or equal to the outdoor temperature threshold, control the operation of the cooling fan; and

S104 , in response to the second comparison result that the outdoor temperature is less than the external temperature threshold and the detection result that the chiller is in an operating state, control the operation of the cooling fan.

The control method provided by the invention selects the control parameters by utilizing the external environment parameters and the operating characteristics of the unit itself, so as to realize the start-stop control of the cooling fan, without adding additional control components, with high reliability and good control performance.

In an optional embodiment, in step S104, the response to the detection result that the chiller is in the running state includes:

Detect the start-stop status of the functional components of the chiller, including: fans and compressors of the chiller;

When at least one of the functional components is in an enabled state, a detection result that the chiller is in a running state is obtained.

Here, when one or both of the fans or compressors of the chiller are running, the chiller can be regarded as running, and the electric control cabinet will continue to generate heat during the process of adjusting the operating parameters of the functional components. In order to speed up the electric control To dissipate the heat generated by the cabinet, it is necessary to turn on the operation of the cooling fan. Therefore, when the detection result that the chiller is in the running state is obtained, although the temperature of the external environment has little influence on the temperature of the electric control cabinet, it is still necessary to turn on the operation of the cooling fan.

In the embodiment of the present invention, for the aforementioned cooling fan that operates after the first comparison result, after the outdoor temperature is lower than the external temperature threshold, the operation of the cooling fan may be stopped. Shutdown can reduce the power consumption of its operation.

For the aforementioned cooling fan that operates after the second comparison result and the detection result, the start-stop status of the functional components of the chiller is generally detected in real time when the cooling fan is running. A pump, wherein the cold pump includes a cooling pump and a freezing pump;

When the functional components are in the shutdown state, the cooling fan is controlled to shutdown.

Here, in the process of judging whether the cooling fan is to be stopped, in addition to judging the operating status of the fan and the compressor, the judgment conditions for the cold pump involving water cooling are also added. The reason is that the chiller reaches the set temperature, Fault protection and other conditions may cause short-term shutdown of the compressor and fan. At this time, the electrical components will continue to heat for a period of time, and the cooling fan should not stop running; therefore, only cooling pumps such as cooling pumps and refrigeration pumps are also used. When stopped at the same time, according to the control logic of the chiller, the chiller must have entered a long-term standby or shutdown state, and it is more reliable to turn off the cooling fan at this time.

Fig. 2 is a second flowchart of a method for controlling a cooling fan of an electric control cabinet of a chiller according to an exemplary embodiment of the present invention. In the application scenario shown in FIG. 2 , the specific flow of the control method of the present invention is as follows:

S201, the operation of the chiller;

S202, detecting the outdoor temperature Tw;

S203, determine whether the outdoor temperature Tw is greater than or equal to Tn, if so, go to step S204, if not, go to step S205;

Here, Tn is the preset external temperature threshold;

S204, control the cooling fan to start running; the process ends;

S205, obtain the running status of the fan and the compressor;

S206, determine that at least one of the fan and the compressor is in an enabled state, if yes, go to step S207, if not, go back to go to step S205;

S207, control the operation of the cooling fan, and go to step S208;

S208, obtain the running status of the fan, compressor, cooling pump and freezing pump;

S209, determine whether the fan, the compressor, the cooling pump and the freezing pump are all in a shutdown state, if so, go to step S210, if not, go to step S208;

S210, control the cooling fan to stop; the process ends.

Fig. 3 is a structural block diagram of a control device for a cooling fan of an electric control cabinet of a chiller according to an exemplary embodiment of the present invention.

As shown in FIG. 3 , the present invention provides a control device for the cooling fan of the electric control cabinet of the chiller. The control device can be used to control the cooling fan of the electric control cabinet of the chiller according to the control method shown in the foregoing embodiment. The operating state is controlled; specifically, the control device 300 includes:

an obtaining unit 310, configured to obtain the outdoor temperature;

a comparison unit 320, configured to compare the outdoor temperature with a preset outdoor temperature threshold;

a first response unit 330, configured to control the operation of the cooling fan in response to the first comparison result that the outdoor temperature is greater than or equal to the outdoor temperature threshold;

The second response unit 340 is configured to control the operation of the cooling fan in response to the second comparison result that the outdoor temperature is less than the outdoor temperature threshold and the detection result that the chiller is in an operating state.

In an optional embodiment, the second response unit 340 is specifically configured to:

Detect the start-stop status of the functional components of the chiller, including: fans and compressors of the chiller;

When at least one of the functional components is in an enabled state, a detection result that the chiller is in a running state is obtained.

In an optional embodiment, the control device 300 further includes:

a detection unit, configured to detect the start-stop state of the functional components of the chiller when the cooling fan is running in response to the second comparison result and the detection result, the functional components include: a fan, a compressor and a cooling pump of the chiller;

The shutdown unit is used to control the cooling fan to stop when the functional components are in the shutdown state.

In an optional embodiment, the cold pump includes a cooling pump and a freezing pump.

In an optional embodiment, the value range of the external temperature threshold is 30°C to 35°C.

It should be understood that the present invention is not limited to the processes and structures that have been described above and shown in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims (8)

1. A control method of a cooling fan of an electric control cabinet of a chiller, wherein the control method comprises: Get the outdoor temperature; comparing the outside temperature with a preset outside temperature threshold; controlling the cooling fan to operate in response to the result of the first comparison that the outside temperature is greater than or equal to the outside temperature threshold; and In response to the second comparison result that the outdoor temperature is less than the outdoor temperature threshold and the detection result that the chiller is in an operating state, controlling the cooling fan to operate; The response to the detection result that the chiller is in the running state includes: Detecting the on-off state of the functional components of the chiller, the functional components include: a fan and a compressor of the chiller; When at least one of the functional components is in an enabled state, a detection result that the chiller is in an operating state is obtained. 2. The control method according to claim 1, wherein the control method further comprises: Detecting the start-stop state of the functional components of the chiller when the cooling fan is running in response to the second comparison result and the detection result, the functional components include: a fan, a compressor, and a cooling unit of the chiller. Pump; When the functional components are all in a shutdown state, the cooling fan is controlled to stop. 3. The control method according to claim 2, wherein the cold pump comprises a cooling pump and a freezing pump. 4 . The control method according to claim 1 , wherein the value range of the external temperature threshold is 30-35° C. 5 . 5. A control device for a cooling fan of an electric control cabinet of a chiller, wherein the control device comprises: The acquisition unit is used to acquire the outdoor temperature; a comparison unit, configured to compare the outdoor temperature with a preset outdoor temperature threshold; a first response unit, configured to control the operation of the cooling fan in response to a first comparison result that the outdoor temperature is greater than or equal to the outdoor temperature threshold; a second response unit, configured to control the operation of the cooling fan in response to a second comparison result that the outdoor temperature is less than the outdoor temperature threshold and a detection result that the chiller is in an operating state; The second response unit is specifically used for: Detecting the on-off state of the functional components of the chiller, the functional components include: a fan and a compressor of the chiller; When at least one of the functional components is in an enabled state, a detection result that the chiller is in an operating state is obtained. 6. The control device according to claim 5, wherein the control device further comprises: A detection unit, configured to detect a start-stop state of a functional component of the chiller when the cooling fan is running in response to the second comparison result and the detection result, the functional component comprising: a fan of the chiller , compressors and cold pumps; The shutdown unit is configured to control the cooling fan to stop when the functional components are in a shutdown state. 7. The control device according to claim 6, wherein the cold pump comprises a cooling pump and a freezing pump. 8 . The control device according to claim 5 , wherein the value range of the external temperature threshold is 30-35° C. 9 .

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