CN113639452B - Compressor control method for heat exchange system - Google Patents

Abstract

The invention belongs to the technical field of heat exchange, and specifically provides a compressor control method for a heat exchange system. The invention aims to solve the problem that the existing compressor control method is easily forced to shut down the air conditioning unit due to improper control. To this end, the compressor control method of the present invention includes: when the load demand of the compressor changes, obtaining the current operating parameters and load demand change information of the compressor; combining the current operating parameters and load demand change information of the compressor with the The data stored in the server is compared; according to the comparison results, the operating parameters of the compressor are selectively adjusted according to the change in load demand; wherein, the data stored in the server includes standard operating parameters and their corresponding allowable load demand changes information. The present invention predicts whether the compressor will fail after adjustment through the above method, so that it can be adjusted on the premise that there will be no failure, thereby effectively ensuring the reliability of the unit operation.

Description

Compressor control method for heat exchange system

technical field

The invention belongs to the technical field of heat exchange, and specifically provides a compressor control method for a heat exchange system.

Background technique

With the continuous improvement of people's living standards, heat exchange equipment has become an indispensable equipment in people's lives. For all heat exchange equipment, the compressor is not only an essential and important component, but also the most prone to failure. Especially for the magnetic levitation variable frequency centrifugal water chiller with extremely high usage rate in recent years, the problem that the compressor fails and affects the normal operation of the unit is particularly prominent. Specifically, since the magnetic levitation centrifugal compressor used in the magnetic levitation variable frequency centrifugal chiller does not need to use lubricating oil during operation, the unit does not need to be equipped with an oil circuit, and naturally there are many fewer components, that is, this unit almost only needs The compressor, condenser, throttling valve and evaporator are installed on the refrigerant circulation circuit to operate normally. Based on this, although the overall failure rate of this unit has decreased; however, the problem that the compressor is prone to failure has been highlighted, that is, 90% of the failures of this unit during operation are caused by its compressor. machine, and the existing compressor control method always controls the operation of the compressor according to the heat exchange demand of the unit, and then compares the operating parameters of the compressor with the preset operating parameters. When the operating parameters of the compressor exceed a certain fixed The unit will only issue an early warning when the preset operating parameters are set; however, in this case, the compressor is already in a bad operating state, and it is easy to directly shut down, which directly leads to the failure of the entire unit to operate normally, which seriously affects the user experience.

Correspondingly, there is a need in the art for a new compressor control method for heat exchange systems to solve the above problems.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the existing compressor control method is easy to cause the air-conditioning unit to be forced to shut down due to improper control, the present invention provides a compressor control method for a heat exchange system, The heat exchange system includes an air-conditioning unit and a server, the air-conditioning unit includes the compressor, and the compressor control method includes: obtaining the current load demand of the compressor when the load demand of the compressor changes. Operating parameters and load demand change information; comparing the current operating parameters and load demand change information of the compressor with the data stored in the server; The operating parameters are adjusted; wherein, the data stored in the server includes standard operating parameters and their corresponding allowable load demand change information.

In the preferred technical solution of the above compressor control method, the step of "selectively adjusting the operating parameters of the compressor according to the change in load demand according to the comparison results" includes: if the current operating parameters of the compressor and If the load demand change information matches the standard operating parameters stored in the server and the corresponding allowable load demand change information, then the operating parameters of the compressor are adjusted according to the load demand change.

In the preferred technical solution of the above-mentioned compressor control method, the data stored in the server also includes critical operating parameters, and in the process of "combining the current operating parameters and load demand change information of the compressor with the data stored in the server Before the step of “comparison”, the compressor control method also includes: comparing the current operating parameter of the compressor with the critical operating parameter; according to the comparison between the current operating parameter of the compressor and the critical operating parameter As a result, the step of "comparing the current operating parameters and load demand change information of the compressor with the data stored in the server" is selectively performed.

In the preferred technical solution of the above compressor control method, "according to the comparison result between the current operating parameters of the compressor and the critical operating parameters, selectively execute" change the current operating parameters of the compressor and the load demand The step of "comparing the information with the data stored in the server" includes: if the current operating parameter of the compressor does not match the critical operating parameter, then "comparing the current operating parameter of the compressor with the The step of comparing the load demand change information with the data stored in the server".

In the preferred technical solution of the above compressor control method, "according to the comparison result between the current operating parameters of the compressor and the critical operating parameters, selectively execute" change the current operating parameters of the compressor and the load demand The step of "comparing the information with the data stored in the server" further includes: if the current operating parameter of the compressor matches the critical operating parameter, then not performing "comparing the current operating parameter of the compressor to parameter and load demand change information with the data stored in the server”, and do not adjust the operating parameters of the compressor according to the load demand change.

In the preferred technical solution of the above-mentioned compressor control method, the data stored in the server also includes critical operating parameters, "according to the comparison results, selectively adjust the operating parameters of the compressor according to the change in load demand" The step further includes: if the current operating parameter of the compressor matches the critical operating parameter, then not adjusting the operating parameter of the compressor according to the change of the load demand.

In the preferred technical solution of the above compressor control method, in the case that the current operating parameter of the compressor matches the critical operating parameter, the compressor control method further includes: sending out an instruction to continue adjusting the compressor There will be a prompt of failure when running parameters.

In the preferred technical solution of the above compressor control method, the current operating parameters and load demand change information of the compressor are different from the standard operating parameters and their corresponding allowable load demand change information stored in the server. In the case of matching, the compressor control method further includes: comparing the current operating parameter of the compressor with a preset parameter range; if the current operating parameter of the compressor is within the preset parameter range, then The operating parameters of the compressor are adjusted according to the change of the load demand.

In a preferred technical solution of the compressor control method above, the load demand change information is the load demand change direction and/or the load demand change range.

In the preferred technical solution of the above compressor control method, the current operating parameters of the compressor are the suction temperature, discharge temperature, suction pressure, discharge pressure, frequency converter temperature and motor temperature of the compressor. one or more.

Those skilled in the art can understand that, in the technical solution of the present invention, the heat exchange system of the present invention includes an air-conditioning unit and a server, the air-conditioning unit includes a compressor, and the compressor control method of the present invention includes: When the load demand of the compressor changes, obtain the current operating parameters and load demand change information of the compressor; compare the current operating parameters and load demand change information of the compressor with the data stored in the server; According to the comparison result, the operating parameters of the compressor are selectively adjusted according to the load demand change; wherein, the data stored in the server includes standard operating parameters and their corresponding allowable load demand change information. The present invention compares the current operating parameters and load demand change information of the compressor with the data stored in the server to predict in advance whether the compressor will fail after adjustment, so that when the compressor does not On the premise of failure, the operating parameters of the compressor are adjusted, and then the heat exchange efficiency of the air conditioning unit is effectively improved on the premise of effectively ensuring the normal operation of the air conditioning unit.

Description of drawings

Fig. 1 is the overall structural representation of the air conditioning unit of the present invention;

Fig. 2 is a flow chart of main steps of the compressor control method of the present invention;

Fig. 3 is a flow chart of specific steps of the compressor control method of the present invention;

Reference signs: 11, magnetic levitation centrifugal compressor; 12, one-way valve; 13, condenser; 14, first stop valve; 15, filter; 16, throttle valve; 17, second stop valve; 18, Evaporator; 19. Butterfly valve.

Detailed ways

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention. For example, although the various steps of the method of the present invention are described in a specific order in the present application, these orders are not limiting, and those skilled in the art can perform the steps in different orders without departing from the basic principles of the present invention. Follow the steps described.

It should be noted that, in the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be directly connected, indirectly connected through an intermediary, or The connection between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

Specifically, the heat exchange system of the present invention includes an air-conditioning unit and a server, the air-conditioning unit includes a controller, the controller can control the operation of the air-conditioning unit, and the controller can also establish a communication connection with the server . It should be noted that the controller and the server may communicate via a wired connection or via a wireless connection (such as bluetooth, wifi, etc.); the server may be a cloud server or a local server. Referring to Fig. 1, this figure is the overall structure schematic diagram of air-conditioning unit of the present invention, as shown in Fig. 1, described air-conditioning unit comprises main circulation circuit and the magnetic levitation centrifugal compressor 11 that is arranged on this main circulation circuit successively, one-way Valve 12, condenser 13, first cut-off valve 14, filter 15, throttle valve 16, second cut-off valve 17, evaporator 18 and butterfly valve 19, the air conditioning unit passes through the main circulation loop and is arranged in the The magnetic levitation centrifugal compressor 11, condenser 13, throttle valve 16 and evaporator 18 on the main circulation loop realize heat exchange. It should also be noted that although this preferred embodiment is described in conjunction with the situation when the air-conditioning unit is a magnetic levitation variable-frequency centrifugal chiller, the air-conditioning unit can obviously also be other types of units. The compressor control method can achieve better technical effects when applied to magnetic levitation frequency conversion centrifugal chillers, that is, technicians can set the specific structure of the air conditioning unit according to the actual use requirements; the change of this application object does not Deviation from the basic principle of the present invention belongs to the protection scope of the present invention. In addition, the controller can obtain the operating conditions of the magnetic levitation centrifugal compressor 11, such as its operating parameters, loading and unloading requirements, etc., and the controller can also compare these data with the data stored in the server, Then control the operation of the maglev centrifugal compressor 11 based on the comparison results; of course, the present invention does not impose any restrictions on the subject that implements the compressor control method, as long as the heat exchange system can perform the compressor control method of the present invention. Those skilled in the art can also understand that the present invention does not impose any restrictions on the specific structure and model of the controller, and the controller can be the original controller of the air conditioning unit, or it can be used to implement the present invention. The controller is set separately according to the compressor control method, and the technician can set the structure and model of the controller according to the actual use requirements.

Next, refer to FIG. 2 , which is a flow chart of the main steps of the compressor control method of the present invention. As shown in Figure 2, based on the heat exchange system described in the above embodiments, the compressor control method of the present invention mainly includes the following steps:

S1: When the load demand of the compressor changes, obtain the current operating parameters and load demand change information of the compressor;

S2: Compare the current operating parameters and load demand change information of the compressor with the data stored in the server;

S3: According to the comparison result, selectively adjust the operating parameters of the compressor according to the change of the load demand.

In step S1, if the controller detects that there is a change in load demand of the compressor 11, the current operating parameters and load demand change information of the compressor 11 are obtained. Specifically, when the heat exchange demand of the air-conditioning unit changes, the load demand of the compressor 11 will also change, for example, when the inlet water temperature of the air-conditioning unit changes, or the set outlet water temperature changes. , the heat exchange demand of the air conditioner unit will change, and the load demand of the compressor 11 will also change accordingly. It should be noted that, the present invention does not impose any restrictions on the specific type and method of obtaining the current operating parameters of the compressor 11 by the controller, and technicians can set them by themselves according to actual use requirements. For example, the current operating parameters can be compression One or more of the suction temperature, exhaust temperature, suction pressure, exhaust pressure, frequency converter temperature and motor temperature of the machine 11, this change does not deviate from the basic principle of the present invention, and belongs to the protection of the present invention scope. In addition, the present invention does not impose any restrictions on the specific type and method for the controller to obtain the load demand change information of the compressor 11, and technicians can set it according to actual usage requirements. For example, the load demand change information can be load demand The direction of change and/or the range of load demand change, that is, whether the compressor 11 needs to be loaded or unloaded, and its loading range or load reduction range.

In step S2, the controller may obtain the data stored in the server, and compare the acquired current operating parameters and load demand change information of the compressor 11 with the data stored in the server; wherein, the The data stored in the server includes standard operating parameters and their corresponding allowable load demand change information. Of course, this comparison process can be completed in the controller, also can be completed in the server, and can even be completed with the help of external equipment, as long as the comparison can be realized; the change of the specific implementation subject does not deviate from this The basic principle of the invention belongs to the protection scope of the present invention. It should be noted that the standard operating parameters are the parameters that the compressor 11 can operate normally with the operating parameters and can also operate normally after the normal load and/or load reduction preset range, these standard operating parameters are usually set by the manufacturer The standard data measured through multiple tests before leaving the factory, of course, may also include some data obtained through self-learning during the operation of the air-conditioning unit.

In step S3, the controller can selectively adjust the operating parameters of the compressor 11 according to the change of load demand according to the comparison result; specifically, the controller can predict the performance of the compressor 11 in advance according to the comparison result. Whether there will be a fault after the adjustment, so that the controller will adjust the operating parameters of the compressor 11 under the premise that the compressor 11 will not fail, and then under the premise of effectively ensuring that the air conditioning unit can operate normally, Then effectively improve the heat exchange efficiency of the air conditioning unit. It should be noted that the present invention does not set any limitation on the specific corresponding relationship between the comparison result and whether to adjust the compressor 11, and technicians can set it by themselves according to actual usage requirements.

Referring to FIG. 3 below, this figure is a flow chart of specific steps of the compressor control method of the present invention. As shown in Figure 3, based on the heat exchange system described in the above embodiments, the compressor control method of the present invention specifically includes the following steps:

S101: Acquiring current operating parameters and load demand change information of the compressor when the load demand of the compressor changes;

S102: Determine whether the current operating parameter matches the critical operating parameter; if yes, execute step S103; if not, execute step S104;

S103: Do not adjust the operating parameters of the compressor according to the change of load demand, and issue a prompt that failure will occur if the operating parameters of the compressor continue to be adjusted;

S104: Determine whether the current operating parameters and load demand change information match the standard data stored in the server; if yes, execute step S106; if not, execute step S105;

S105: Determine whether the current operating parameter is within the preset parameter range; if yes, execute step S106; if not, execute step S103;

S106: Adjust the operating parameters of the compressor according to the change of the load demand.

Specifically, in step S101, if the controller detects that there is a change in load demand of the compressor 11, the current operating parameters and load demand change information of the compressor 11 are acquired. In this preferred embodiment, the load demand change information includes the load demand change direction and the load demand change range of the compressor 11, that is, whether the compressor 11 needs to be loaded and its corresponding loading range or whether it needs to be deloaded and its corresponding loading range. Corresponding load shedding range. Of course, this is not restrictive, and technicians can also set the types of the load demand change information according to actual usage requirements. In addition, it should be noted that the present invention does not impose any restrictions on the type and method of obtaining the current operating parameters of the compressor 11 by the controller, and technicians can set them by themselves according to actual use requirements. It is one or more of the suction temperature, discharge temperature, suction pressure, discharge pressure, inverter temperature and motor temperature of the compressor 11.

Next, in step S102, the controller can compare the current operating parameters of the compressor 11 with the critical operating parameters stored in the server, so as to determine whether the current operating parameters of the compressor 11 are critical to the critical operating parameters stored in the server. Whether the operating parameters match, the present invention effectively simplifies the overall calculation amount by setting this judgment condition, so that the controller can quickly eliminate some situations where the compressor 11 cannot be adjusted. The critical operating parameter is the parameter that the compressor 11 can operate normally with this operating parameter, but cannot continue to operate normally after loading or unloading on the basis of this operating parameter; in other words, the compressor 11 can normally operate with this operating parameter. However, loading and unloading operations are not allowed, otherwise the compressor 11 will not be able to operate normally. These critical operating parameters are usually measured by the manufacturer after many tests before leaving the factory. Of course, some The data obtained by the air conditioning unit through self-learning during operation.

It should be noted that, in this preferred embodiment, there are two ways to judge whether the current operating parameter matches the critical operating parameter, one is to judge whether the current operating parameter is equal to the critical operating parameter, The other is to judge whether the difference between the current operating parameter and the critical operating parameter is less than a preset difference, as long as any one of the conditions is met, it belongs to the case where the current operating parameter matches the critical operating parameter , that is, as long as the current operating parameter matches the critical operating parameter, continuing to load and unload the compressor 11 will cause the compressor 11 to fail to operate normally. Of course, technicians can also make adjustments according to actual usage needs.

In addition, it should be noted that when the obtained current operating parameters include only one type, only this type of parameter can be compared; and when the current operating parameters include multiple types, each type of parameter can be compared separately, Then combine all the comparison results to make judgments, and you can also set priorities for different parameters, first determine the types of parameters involved in the judgment according to the priorities, and then make judgments based on the determined parameters; the change of this specific comparison method does not deviate from the original The basic principle of the invention belongs to the protection scope of the present invention.

Based on the judgment result of step S102, if the current operating parameter of the compressor 11 matches the critical operating parameter stored in the server, then step S103 is executed, specifically, the controller does not adjust the compressor according to the change of the load demand. 11 operating parameters, that is, to keep the compressor 11 in the current operating state, so as to effectively avoid the problem that the compressor 11 fails after adjustment and cause the entire unit to fail to operate normally, and thus ensure the air conditioning unit to the greatest extent. able to maintain normal operation. On this basis, the air-conditioning unit can also send a reminder to the user that failures will occur if the operation parameters of the compressor 11 continue to be adjusted, so that the user can grasp the operation status of the air-conditioning unit in time, and the air-conditioning unit can also upload the Current running data to prompt background workers. It should be noted that the present invention does not impose any restrictions on the way the air-conditioning unit prompts the user, and technicians can set it according to actual use needs, as long as the user can be prompted; for example, through the display screen of the air-conditioning unit, Or play it out through the voice announcement system of the air conditioning unit.

In addition, if the current operating parameters of the compressor 11 do not match the critical operating parameters stored in the server, step S104 is performed, that is, the controller can determine that the current operating parameters and load demand change information of the compressor 11 are consistent with the specified Whether the standard operating parameters stored in the server and the corresponding allowable load demand change information match. In this preferred embodiment, the controller can obtain the current operating parameters of the compressor 11, the direction of change in load demand and the range of change in load demand in step S101, and the controller can share these data with the The stored standard data is compared to determine whether the current operating parameters and load demand change information of the compressor 11 match the standard operating parameters and the corresponding allowable load demand change information stored in the server, and determine based on the comparison results Whether the controller can adjust the operating parameters of the compressor 11 according to the change of the load demand.

In addition, it should be noted that step S102 and step S104 can also be executed simultaneously as parallel steps, that is, the controller can also execute step S102 and step S104 at the same time, and the change of the judgment order does not deviate from the basic principle of the present invention , belong to the protection scope of the present invention. At the same time, the step of acquiring load demand change information can also be performed between step S102 and step S104, and such a change of acquisition timing does not deviate from the basic principle of the present invention, and belongs to the protection scope of the present invention.

Based on the judgment result of step S104, if the current operating parameters and load demand change information of the compressor 11 match the standard operating parameters and their corresponding allowable load demand change information stored in the server, then perform step S106 . For example, in the case that the current operating parameters of the compressor 11 match a certain standard operating parameter stored in the server, if the load demand change direction and the load demand change range of the compressor 11 can also match the standard operating parameters The corresponding allowable load demand change direction matches the load demand change range, that is, when the load demand change direction of the compressor 11 is the same as the allowable load demand change direction corresponding to the standard operating parameters, if the compressor 11 load demand change range is less than or equal to the allowable load demand change range corresponding to the standard operating parameters, then directly execute step S106, that is, the controller can control the operation of the compressor 11 according to the load demand change situation The parameters are adjusted so as to meet the user's heat exchange demand at the fastest speed under the premise of ensuring the normal operation of the air conditioning unit.

In addition, if the current operating parameters and load demand change information of the compressor 11 do not match the standard operating parameters and their corresponding allowable load demand change information stored in the server, step S105 is performed, that is, the The controller can determine whether the current operating parameter of the compressor 11 is not within the preset parameter range, so as to further determine whether the controller can adjust the operating parameter of the compressor 11 according to the change of the load demand. It should be noted that the technicians can set the preset parameter range according to the actual use requirements, as long as the current operating parameter of the compressor 11 exceeds the preset parameter range, it will definitely cause the air conditioning unit to break down. Can.

Based on the judging result of step S105, if the current operating parameter of the compressor 11 is within the preset parameter range, step S106 is executed, that is, the controller performs a process on the operating parameter of the compressor 11 according to the change of the load demand. Adjust in order to effectively meet the user's heat transfer needs. If the current operating parameters of the compressor 11 are not within the preset parameter range, step S103 is executed, that is, the controller does not adjust the operating parameters of the compressor 11 according to the load demand change, that is, the compressor It only needs to maintain the current operating state of the air conditioner 11, so as to effectively avoid the problem that the compressor 11 malfunctions after adjustment and cause the entire unit to fail to operate normally, and thus ensure that the air conditioner unit can maintain normal operation to the greatest extent.

Those skilled in the art can understand that the heat exchange system can realize self-learning through the subsequent operation results of step S105, that is, if the operation parameters of the compressor 11 are adjusted, the air conditioning unit can still operate normally, then the The controller can upload this set of data to the server, and the server stores this set of data as standard data; and if the operating parameters of the compressor 11 are adjusted, the air conditioning unit cannot operate normally and shuts down, then The controller can also upload the set of data to the server, and the server stores the operating parameters as critical operating parameters, and different units of the same model can upload their respective data to the server, so that Realize data sharing, thereby effectively improving the accuracy of judgment results, and then gradually improving the reliability of the air-conditioning system.

Finally, it should be noted that the above examples are all preferred implementations of the present invention, and are not intended to limit the protection scope of the present invention. When actually using the present invention, those skilled in the art may appropriately add or delete some steps as required, or exchange the order of different steps. This change does not go beyond the basic principles of the present invention and belongs to the protection scope of the present invention.

So far, the technical solutions of the present invention have been described in conjunction with the accompanying drawings, but those skilled in the art will easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims (3)

1. A compressor control method for a heat exchange system, wherein the heat exchange system includes an air conditioner unit and a server, the air conditioner unit includes the compressor, and the compressor control method includes: In the case that the load demand of the compressor changes, obtain the current operating parameters and load demand change information of the compressor; comparing the current operating parameters and load demand change information of the compressor with the data stored in the server; According to the comparison result, selectively adjust the operating parameters of the compressor according to the load demand change; Wherein, the data stored in the server includes standard operating parameters and their corresponding allowable load demand change information; The step of "selectively adjusting the operating parameters of the compressor according to the load demand change according to the comparison result" includes: If the current operating parameters and load demand change information of the compressor match the standard operating parameters and their corresponding allowable load demand change information stored in the server, then the Adjust the operating parameters of the compressor; The data stored in the server also includes critical operating parameters, and before the step of "comparing the current operating parameters and load demand change information of the compressor with the data stored in the server", the compressor control method Also includes: comparing a current operating parameter of the compressor with the critical operating parameter; If the current operating parameters of the compressor match the critical operating parameters, the step of "comparing the current operating parameters and load demand change information of the compressor with the data stored in the server" is not performed, And do not adjust the operating parameters of the compressor according to the change of the load demand, and issue a prompt that failure will occur if the operating parameters of the compressor are continued to be adjusted; If the current operating parameters of the compressor do not match the critical operating parameters, the step of "comparing the current operating parameters and load demand change information of the compressor with the data stored in the server" is performed; In the case that the current operating parameters and load demand change information of the compressor do not match the standard operating parameters and their corresponding allowable load demand change information stored in the server, the compressor control method further include: comparing the current operating parameters of the compressor with a preset parameter range; If the current operating parameter of the compressor is within the preset parameter range, the operating parameter of the compressor is adjusted according to the change of the load demand. 2 . The compressor control method according to claim 1 , wherein the load demand change information is a load demand change direction and/or a load demand change range. 3. The compressor control method according to claim 1, wherein the current operating parameters of the compressor are suction temperature, discharge temperature, suction pressure, discharge pressure, frequency converter One or more of temperature and motor temperature.

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