Control method of air conditioning system

Abstract

The invention relates to a control method of an air conditioning system, the air conditioning system comprises a compressor and a condenser which are in fluid connection, the compressor is a diaphragm compressor and comprises a refrigerant inlet, a refrigerant outlet, a working chamber connected between the refrigerant inlet and the refrigerant outlet, and a suction valve arranged between the refrigerant inlet and the working chamber; the electric control valve is arranged between the inlet and the working chamber and connected with the suction valve in parallel, the diaphragm piece is arranged between the working chamber and the power chamber, the flywheel provides driving force for the diaphragm piece, and the motor provides driving force for the flywheel. The control method comprises the steps that the pressure of the condenser is obtained in real time; and if it is determined that the pressure of the condenser is in the first pressure interval, the electric control valve is controlled to be alternately opened and closed at the first frequency. According to the control method, the compressor of the air conditioning system can intermittently provide large short-time compression force for a long time, and sufficient compression of the refrigerant is facilitated.

Description

Technical Field

[0001] This application is a divisional of application number CN2021105835430, and specifically relates to a control method for an air-conditioning system. Background Art

[0002] The air conditioning compressor is the core component of the air conditioning system, and plays the role of compressing and driving the refrigerant in the air conditioning refrigerant circuit. The air conditioning compressor extracts the refrigerant from the low-pressure area, compresses it, and sends it to the high-pressure area for cooling and condensation. The heat is dissipated into the air through the heat sink, and the refrigerant also changes from gas to liquid, and the pressure increases.

[0003] The power of the air conditioner compressor comes from the motor. The output power of the motor is the main factor that determines the working capacity of the compressor. The compression force that the compressor can provide should not be less than the pressure in the air conditioner condenser. The pressure in the air conditioner condenser is not constant, and it is related to many factors such as ambient temperature and refrigerant state. When the condenser pressure is low, the compressor power does not need to be very large; when the condenser pressure is high, the compressor should have a large output power to be able to provide a higher pressure to press the refrigerant into the high-pressure condenser.

[0004] However, in actual applications, due to various reasons, such as when the power supply is relatively small (such as small photovoltaic power supply), or when the space available for placing equipment is very limited, it is not possible to configure the compressor with an ultra-high power motor, which may cause it to fail to work normally and the application scenarios are greatly limited. Summary of the invention

[0005] The technical problem to be solved by the present application is to propose a control method for an air-conditioning system, wherein the control method enables the compressor of the air-conditioning system to have a higher instantaneous compression force, thereby facilitating sufficient compression of the refrigerant.

[0006] The technical solution of this application is:

[0007] The present application provides a control method for an air conditioning system, wherein the air conditioning system comprises a compressor and a condenser connected in fluid, wherein the compressor is a diaphragm compressor, and the compressor comprises:

[0008] Refrigerant inlet and outlet,

[0009] a working chamber connected between the inlet and the outlet,

[0010] a suction valve disposed between the inlet and the working chamber,

[0011] an electrically controlled valve disposed between the inlet and the working chamber and connected in parallel with the suction valve,

[0012] Power chamber,

[0013] A diaphragm is arranged between the working chamber and the power chamber,

[0014] a flywheel for providing driving force to the diaphragm, and

[0015] A motor providing driving force for the flywheel;

[0016] The control method comprises:

[0017] Obtaining the pressure of the condenser in real time;

[0018] If it is determined that the pressure of the condenser is in the first pressure interval, the electrically controlled valve is controlled to be alternately opened and closed at a first frequency.

[0019] In an optional design, the control method further includes:

[0020] If it is determined that the pressure of the condenser is in a second pressure range that has no intersection with the first pressure range, the electrically controlled valve is controlled to open and close alternately at a second frequency; wherein the lower limit of the second pressure range is greater than the upper limit of the first pressure range, and the ratio of the duration of the electrically controlled valve (38) being alternately opened and closed at the second frequency in each cycle of the second frequency is less than the ratio of the duration of the electrically controlled valve (38) being alternately opened and closed at the first frequency in each cycle of the first frequency.

[0021] In an optional design, the control method further includes:

[0022] If it is determined that the pressure of the condenser is greater than a first pressure threshold, controlling the electric control valve to continue to separate; wherein the first pressure threshold is greater than an upper limit of the first pressure range;

[0023] If it is determined that the pressure of the condenser is less than a second pressure threshold, the electrically controlled valve is controlled to be continuously closed; wherein the second pressure threshold is less than a lower limit of the first pressure range.

[0024] This application has at least the following beneficial effects:

[0025] The diaphragm pump or diaphragm compressor of the present application is equipped with a flywheel connected to the driving path of the motor to the diaphragm and a power fluid storage chamber connected to the power chamber fluid, and a valve is set on the connecting path between the two. During the operation of the motor, the aforementioned valve can be opened and closed alternately according to the set frequency, and then the driving path of the flywheel to the diaphragm can be alternately disconnected and connected at the frequency, so that the flywheel and the diaphragm intermittently work in each cycle time of the aforementioned frequency, and the motor periodically stores energy to the flywheel. Generally, as long as the energy provided by the continuously running motor and the power consumption of the diaphragm that only works in part of the time can be balanced in each cycle time, the diaphragm pump or diaphragm compressor can continue to operate stably and intermittently work at high power, which helps the diaphragm pump or diaphragm compressor to complete some tasks that cannot be completed originally, such as enabling the working fluid to be smoothly transported to the desired location or compressing the working fluid into the desired state.

[0026] 1. The control method of the air conditioning system of the present application controls the diaphragm compressor with the energy storage flywheel to intermittently compress the refrigerant according to the set frequency when the condenser pressure is in the appropriate range, so that the flywheel intermittently performs work and stores energy in each cycle of the frequency, and thereby enables the diaphragm compressor to intermittently and vigorously compress the refrigerant fluid in the working chamber relatively smoothly. The method further enables the diaphragm compressor equipped with a relatively small power motor, especially a motor powered by household photovoltaic power, to fully compress the refrigerant.

[0027] 2. The control method of the air-conditioning system of the present application continuously disconnects the flywheel and the diaphragm or the workload when the condenser pressure is high to avoid serious overload of the compressor; and continuously connects the flywheel and the diaphragm or the workload when the condenser pressure is low to reduce energy waste and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a longitudinal cross-sectional view of the diaphragm pump in Example 1 of the present application.

[0029] Figure 2 yes Figure 1 An enlarged view of the X1 section.

[0030] Figure 3 yes Figure 2 Structural block diagram of the control system of the electric control valve.

[0031] Figure 4 It is a longitudinal cross-sectional view of the diaphragm pump in Example 2 of the present application.

[0032] Figure 5 yes Figure 4 Enlarged view of the X2 section.

[0033] Figure 6 yes Figure 5 Structural block diagram of the control system of the electric control valve.

[0034] Figure 7 It is a longitudinal cross-sectional view of the diaphragm pump in Example 3 of the present application.

[0035] Figure 8 yes Figure 7 Structural block diagram of the control system of the discharge valve.

[0036] Fig. 9 It is a structural schematic diagram of the air-conditioning system in the fourth embodiment of the present application.

[0037] Fig.10 yes Fig. 9 Structural block diagram of the control system of the electric control valve.

[0038] In order to help readers observe the structure of the diaphragm pump or diaphragm compressor more clearly, some of the drawings intentionally hide the working fluid and the power fluid, and some of the drawings intentionally hide the guide seat.

[0039] Description of reference numerals:

[0040] a-working fluid, b-power fluid, O-pivot axis of crankshaft;

[0041] 1-working chamber, 2-power chamber, 2a-first half chamber, 2b-second half chamber, 3-diaphragm, 3a-deformation folds of diaphragm, 4-piston, 5-motor, 6-inlet, 7-exhaust, 8-intake valve, 9-exhaust valve, 10-power fluid storage chamber, 11-valve, 12-reducer, 13-crankshaft, 14-first connecting rod, 15-second connecting rod, 16-push-pull rod, 17-transmission chamber, 18-third connecting rod, 19-fourth connecting rod, 20-fifth connecting rod, 2 1-sixth connecting rod, 22-pivot, 23-guide seat, 23a-guide groove, 24-flywheel, 25-coupling, 26-skin bag, 27-blocking net, 28-linear bearing, 29-hoop, 30-rigid ring sleeve, 31-flexible ring sheet, 31a-deformation folds of flexible ring sheet, 32-pressure bearing seat, 32a-circular ring groove, 33-housing, 34-motor speed sensor, 35-controller, 36-fuel tank cap, 37-clutch, 38-electric control valve, 39-pressure sensor;

[0042] 100-compressor, 200-condenser, 300-throttle valve, 400-evaporator. DETAILED DESCRIPTION

[0043] In the description of the specification and claims of this application, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described and do not have any order or technical meaning. Therefore, an object defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects. In addition, similar words such as "one" or "a" do not indicate a quantitative limitation, but rather indicate the existence of at least one, and "multiple" means not less than two. The "multiple" mentioned in this application means not less than two.

[0044] In the description of the specification and claims of this application, if there are terms such as "connection", "installation", "fixation", etc., unless otherwise specified, they should be understood in a broad sense. For example, "connection" can be a separate connection or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a non-detachable connection or a detachable connection. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] In the description of the specification and claims of this application, if there are terms such as "upper", "lower", "horizontal" and the like indicating an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the application clearly and simply, and does not indicate or imply that the elements referred to must have a specific direction, be constructed and operated in a specific orientation. These directional terms are relative concepts, used for relative description and clarification, and may change accordingly according to the change in the orientation of the components placed in the drawings. For example, if the device in the figure is turned over, the elements described as "below" other elements will be positioned "above" other elements.

[0046] In the description of the specification and claims of this application, if there is a term "based on" or "according to", it is used to describe one or more factors that affect the determination. The term does not exclude additional factors that affect the determination. That is, the determination may be based only on these factors or at least partially on these factors. For example, the phrase "based on A, B is determined". In this case, A is a factor that affects the determination of B. This phrase does not exclude that the determination of B may also be based on C.

[0047] In the description of the specification and claims of this application, if the term "configured to" is present, it can generally be interchanged with "having the ability to", "designed to", "for" or "capable of", depending on the context.

[0048] Now, embodiments of the present application are described with reference to the accompanying drawings.

[0049] Embodiment 1:

[0050] Figure 1The seventh diaphragm pump is shown, which is particularly suitable for the following situation: the fluid pressure at the inlet 6 is much smaller than the fluid pressure at the outlet 7, the extraction force for extracting the working fluid from the inlet 6 to the working chamber 1 is much smaller than the thrust for pushing the working fluid from the working chamber to the outlet 7, and the power consumption for extracting the working fluid is much smaller than the power consumption for pushing the working fluid. For example, the diaphragm pump is arranged at the water source to push water from a low place to a high place. This is similar to the working situation of a diaphragm compressor, so it is also particularly suitable for a diaphragm compressor.

[0051] The structure of the diaphragm pump is similar to that of the sixth embodiment in the parent case (application number: CN2021105835430), except that:

[0052] like Figure 1 , Figure 2 and Figure 3 As shown, the present embodiment is not equipped with a clutch. Instead, in addition to the suction valve 8, an additional electrically controlled valve 38 is provided, which is located between the inlet 6 and the working chamber 1 and is connected in parallel with the suction valve 8. The electrically controlled valve 38 is communicatively connected with the controller 35, so that the working state of the electrically controlled valve 38 can be controlled by the controller 35.

[0053] It can be seen that, in addition to the suction valve 8 originally provided in the conventional diaphragm pump, the present embodiment additionally provides an electrically controlled valve 38 located between the working chamber 1 and the inlet 6 .

[0054] In this embodiment, the suction valve 8 is a mechanical one-way valve. Different from the suction valve 8 that automatically opens and closes by sensing pressure, the opening and closing of the electric control valve 38 can be controlled by an electric signal that is independent of pressure. In other embodiments, the suction valve 8 can also be an electric control one-way valve. The difference between a mechanical one-way valve and an electric control one-way valve is further described below.

[0055] If the electric control valve 38 is in the closed state, the pump head of the diaphragm pump has the same working process as the conventional diaphragm pump head. At this time, as long as the diaphragm pump has sufficient energy, it can extract the working fluid from the inlet 6 into the working chamber 1 and then push it to the outlet 7. However, as mentioned above, the diaphragm pump consumes a lot of power to push the working fluid. Therefore, when the motor 5 rotates at a low speed and the flywheel 24 has insufficient energy storage, the diaphragm pump cannot push the working fluid in the working chamber 1 to the outlet 7 in sufficient quantity.

[0056] If the electric control valve 38 is in the open state, the piston 4 is in Figure 1 When the piston moves to the left, the working fluid in the inlet 6 is easily drawn into the working chamber 1 through the opened electric control valve 38, and the power consumption of this action is relatively small; Figure 1When the middle right shift occurs, the electric control valve 38 is in an open state, and the discharge valve 9 is kept in a closed state due to the high opening pressure, so the working fluid in the working chamber 1 will be discharged from the opened electric control valve 38 to the inlet 6. At this time, the working fluid in the working chamber is discharged from the inlet 6, and the power consumption of this action is also very small. It is equivalent to disconnecting the working load of the diaphragm 3 (at least partially). Therefore, in this process, part of the output power provided by the motor 5 is used to complete the aforementioned extraction and return action, and the other more part is used to do work on the flywheel 24, so that the flywheel 24 speeds up and stores energy.

[0057] It should be noted in particular that the "disconnecting the workload of the diaphragm" mentioned in the specification and claims of this application is not limited to adjusting the workload of the diaphragm to zero, but also includes "only partially disconnecting" the workload of the diaphragm, that is, including the situation of "reducing" the workload of the diaphragm.

[0058] Therefore, this embodiment provides the following control method of the diaphragm pump:

[0059] S301, during the operation of the motor 5, the electrically controlled valve 38 is controlled to be alternately opened and closed at a first frequency.

[0060] That is, during the operation of the motor 5, the electric control valve 38 is opened for the twenty-third time period - closed for the twenty-fourth time period - opened for the twenty-third time period - closed for the twenty-fourth time period... in turn according to the set first frequency. That is, during the operation of the motor 5, the workload of the control diaphragm 3 is alternately disconnected and connected at the first frequency. Moreover, in each cycle of the first frequency, the electric control valve 38 has a continuous opening time period and a continuous closing time period, and the ratio of the opening time period to the closing time period can be set as required. It can be understood that the larger the ratio of the opening time period to the closing time period of the electric control valve 38, the greater the proportion of the energy storage time of the flywheel 24 in each cycle; the smaller the ratio of the opening time period to the closing time period of the electric control valve 38, the smaller the proportion of the energy storage time of the flywheel 24 in each cycle.

[0061] For example, during the operation of the motor, the electric control valve 38 is alternately opened and closed at a frequency of 10 times / minute, and each time it is opened for 2 seconds and closed for 4 seconds. Among them, 10 times / minute means that the valve is opened 10 times and closed 10 times per minute, and the opening and closing are performed alternately. Specifically, the electric control valve is opened for 2 seconds-closed for 4 seconds-opened for 2 seconds-closed for 4 seconds-opened for 2 seconds-closed for 4 seconds…

[0062] During the operation of the motor 5, the electronically controlled valve 38 is controlled to be alternately opened and closed according to the set first frequency, so that the working load of the diaphragm 3 is alternately disconnected and connected. In turn, the flywheel 24 and the diaphragm 3 intermittently perform work in each cycle of the first frequency. The motor 5 periodically stores energy in the flywheel 24. If in each cycle, the energy provided by the motor 5 that runs continuously (for example, the above-mentioned 2 seconds) is balanced with the energy consumed by the diaphragm 3 that performs normal work only in a part of the time period (for example, the above-mentioned 4 seconds), then the diaphragm pump can operate continuously and stably.

[0063] It can be understood that when the electric control valve 38 is closed, the workload of the diaphragm 3 is connected, and the closing time of the electric control valve 38 = the connection time of the workload of the diaphragm. When the electric control valve 38 is opened, the workload of the diaphragm 3 is disconnected, and the opening time of the electric control valve 38 = the disconnection time of the workload of the diaphragm. For the convenience of description, in this embodiment, the connection time of the workload of the diaphragm is referred to as "the connection time of the workload", and the disconnection time of the workload of the diaphragm is referred to as "the disconnection time of the workload".

[0064] It is not appropriate to adopt the control strategy of S301 when the speed of the motor 5 is very low (such as just started). Therefore, the control strategy of S301 can be adopted only when the speed of the motor 5 is in the set first speed interval. That is, during the operation of the motor 5, if it is determined that the speed of the motor 5 is in the first speed interval, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at a first frequency. It can be understood that the aforementioned first speed interval is preferably an interval near the rated speed of the motor 5. For example, if the rated speed of the motor 5 is 10,000 rpm, the first speed interval can be selected as the interval of 9,000-11,000 rpm.

[0065] Of course, the switching frequency of the electric control valve 38 can also be adjusted when the motor 5 is in different speed intervals. For example, if it is determined that the speed of the motor 5 is in a second speed interval that is different from and has no intersection with the first speed interval and is smaller than the first speed interval, the electric control valve 38 is controlled to be alternately opened and closed at a second frequency different from the first frequency. That is, if it is determined that the speed of the motor 5 is in the second speed interval, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at the second frequency.

[0066] In other embodiments, the motor speed sensor 34 may not be configured, and the electric control valve 38 may be controlled to alternately separate and engage at a first frequency by a user providing a user instruction to the controller 35 .

[0067] S302. In the process of controlling the electric control valve 38 to open and close alternately at a first frequency in the above-mentioned S301, if it is detected that the rotation speed of the motor 5 continuously decreases within a first time period, the electric control valve 38 is controlled to open and close alternately at a third frequency; wherein the ratio of the closing time to the opening time of the electric control valve 38 in each cycle of the third frequency is less than the ratio of the closing time to the opening time of the electric control valve 38 in each cycle of the first frequency.

[0068] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at a first frequency, if it is determined that the rotational speed of the motor 5 continuously decreases within a first time period, for example, one minute, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at a third frequency; wherein the ratio of the connection duration to the disconnection duration of the workload in each cycle of the third frequency is less than the ratio of the connection duration to the disconnection duration of the workload in each cycle of the first frequency.

[0069] The speed of the motor 5 decreases continuously within the set first time period, for example, within two minutes, indicating that within the first time period, the energy provided by the motor 5 is less than the power consumption of the diaphragm 3. Therefore, it is necessary to reduce the proportion of the working time of the diaphragm 3, or to increase the proportion of the no-load energy storage time of the flywheel 24. Therefore, when it is detected that the speed of the motor 5 decreases continuously within the first time period, the control electric control valve 38 is alternately opened and closed at a third frequency different from the first frequency. Among them, the ratio of the connection time to the disconnection time of the workload in each cycle of the third frequency is less than the ratio of the connection time to the disconnection time in each cycle of the first frequency.

[0070] For example, the third frequency may be: open the electric control valve for 4 seconds - close the electric control valve for 2 seconds - open the electric control valve for 4 seconds - close the electric control valve for 2 seconds - open the electric control valve for 4 seconds - close the electric control valve for 2 seconds ..., and the cycle is still 10 times per minute. Of course, the third frequency can also be adjusted to 3, 6 or 20 times per minute, etc.

[0071] S303, in the process of controlling the electric control valve 38 to open and close alternately at the third frequency in the above S302, if it is detected that the speed of the motor 5 decreases continuously within the second time period, the electric control valve 38 is controlled to open and close alternately at a fourth frequency. The ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the fourth frequency is less than the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the third frequency.

[0072] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at the third frequency, if it is determined that the speed of the motor 5 is continuously reduced within the second time period, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at the fourth frequency. The ratio of the workload connection time period to the disconnection time period in each cycle of the fourth frequency is less than the ratio of the workload connection time period to the disconnection time period in each cycle of the third frequency.

[0073] The speed of the motor 5 decreases continuously in the second time period, indicating that in the second time period, the energy provided by the motor 5 is still less than the power consumption of the diaphragm 3. Therefore, it is necessary to further reduce the time proportion of the normal operation of the diaphragm 3, or further increase the time proportion of the no-load energy storage of the flywheel 24. Therefore, when it is detected that the speed of the motor 5 continues to decrease continuously in the second time period, the electronically controlled valve 38 is controlled to open and close alternately at the fourth frequency.

[0074] Exemplarily, at the fourth frequency: open the electric-controlled valve for 5 seconds - close the electric-controlled valve for 1 second - open the electric-controlled valve for 5 seconds - close the electric-controlled valve for 1 second - open the electric-controlled valve for 5 seconds - close the electric-controlled valve for 1 second..., still cycling 10 times per minute.

[0075] S304, in the process of controlling the electric control valve 38 to open and close alternately at the third frequency in the above S302, if it is detected that the speed of the motor 5 increases continuously within the third time period, the electric control valve 38 is controlled to open and close alternately at the fifth frequency. The ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the first frequency is greater than the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the fifth frequency, and the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the third frequency.

[0076] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at a third frequency, if it is determined that the rotation speed of the motor 5 continuously increases within the third time length, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at a fifth frequency; wherein, the ratio of the connection duration to the disconnection duration in each cycle of the first frequency is greater than the ratio of the connection duration to the disconnection duration in each cycle of the fifth frequency is greater than the ratio of the connection duration to the disconnection duration in each cycle of the third frequency.

[0077] The rotation speed of the motor 5 increases continuously within the third time period, indicating that within the third time period, the energy provided by the motor 5 is greater than the power consumption of the diaphragm 3. Therefore, the normal working time proportion of the diaphragm 3 can be appropriately increased, or the no-load energy storage time proportion of the flywheel 24 can be appropriately reduced. Therefore, when it is detected that the rotation speed of the motor 5 increases continuously within the third time period, the electronically controlled valve 38 is controlled to be alternately opened and closed at the fifth frequency.

[0078] Exemplarily, at the fifth frequency: open the electric-controlled valve for 3.5 seconds-close the electric-controlled valve for 2.5 seconds-open the electric-controlled valve for 3.5 seconds-close the electric-controlled valve for 2.5 seconds-open the electric-controlled valve for 3.5 seconds-close the electric-controlled valve for 2.5 seconds….

[0079] S305. In the process of controlling the electric control valve 38 to open and close alternately at the first frequency in the above-mentioned S301, if it is detected that the rotation speed of the motor 5 continuously increases within the fourth time length, the electric control valve 38 is controlled to open and close alternately at a sixth frequency; wherein, the ratio of the closing time length to the opening time length of the electric control valve 38 in each cycle of the sixth frequency is greater than the ratio of the closing time length to the opening time length of the electric control valve 38 in each cycle of the first frequency.

[0080] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at a first frequency, if it is determined that the rotation speed of the motor 5 continuously increases within a fourth time period, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at a sixth frequency; wherein the ratio of the connection duration to the disconnection duration of the workload in each cycle of the sixth frequency is greater than the ratio of the connection duration to the disconnection duration of the workload in each cycle of the first frequency.

[0081] The rotation speed of the motor 5 decreases continuously in the fourth time period, indicating that in the fourth time period, the energy provided by the motor 5 is greater than the power consumption of the diaphragm 3. Therefore, the proportion of time that the diaphragm 3 normally works can be increased, or the proportion of the no-load energy storage time of the flywheel 24 can be shortened. Therefore, when it is detected that the rotation speed of the motor 5 decreases continuously in the fourth time period, the electronically controlled valve 38 is controlled to be alternately opened and closed at the sixth frequency.

[0082] Exemplarily, the sixth frequency may be: open the electric control valve for 4 seconds - close the electric control valve for 11 seconds - open the electric control valve for 4 seconds - close the electric control valve for 11 seconds - open the electric control valve for 4 seconds - close the electric control valve for 11 seconds..., cycling on and off 4 times per minute.

[0083] S306, in the process of controlling the electric control valve 38 to open and close alternately at the sixth frequency in the above S305, if it is detected that the speed of the motor 5 increases continuously within the fifth time period, the electric control valve 38 is controlled to open and close alternately at the seventh frequency. The ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the seventh frequency is greater than the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the sixth frequency.

[0084] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at the sixth frequency, if it is determined that the rotation speed of the motor 5 continuously increases within the fifth time period, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at the seventh frequency; wherein, the ratio of the connection duration to the disconnection duration of the workload in each cycle of the seventh frequency is greater than the ratio of the connection duration to the disconnection duration of the workload in each cycle of the sixth frequency.

[0085] The rotation speed of the motor 5 increases continuously in the fifth time period, indicating that in the fifth time period, the energy provided by the motor 5 is still greater than the power consumption of the diaphragm 3. Therefore, the proportion of time that the diaphragm 3 normally works can be further increased, or the proportion of time that the flywheel 24 stores energy without load can be further reduced. Therefore, when it is detected that the rotation speed of the motor 5 continues to decrease continuously in the fifth time period, the electronically controlled valve 38 is controlled to be alternately opened and closed at the seventh frequency.

[0086] Exemplarily, at the seventh frequency: open the electric-controlled valve for 4 seconds-close the electric-controlled valve for 12 seconds-open the electric-controlled valve for 4 seconds-close the electric-controlled valve for 12 seconds-open the electric-controlled valve for 4 seconds-close the electric-controlled valve for 12 seconds….

[0087] S307, in the process of controlling the electric control valve 38 to open and close alternately at the sixth frequency in the above S305, if it is detected that the speed of the motor 5 decreases continuously within the sixth time period, the electric control valve 38 is controlled to open and close alternately at the eighth frequency. The ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the sixth frequency is greater than the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the eighth frequency, and the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the first frequency.

[0088] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at the sixth frequency, if it is determined that the rotational speed of the motor 5 continuously decreases within the sixth time period, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at the eighth frequency; wherein, the ratio of the connection duration to the disconnection duration of the workload in each cycle of the sixth frequency is greater than the ratio of the connection duration to the disconnection duration of the workload in each cycle of the eighth frequency is greater than the ratio of the connection duration to the disconnection duration of the workload in each cycle of the first frequency.

[0089] The speed of the motor 5 decreases continuously in the sixth time period, indicating that in the sixth time period, the energy provided by the motor 5 is less than the power consumption of the diaphragm 3. Therefore, the proportion of time that the diaphragm 3 normally works can be appropriately reduced, or the proportion of the no-load energy storage time of the flywheel 24 can be appropriately increased. Therefore, when it is detected that the speed of the motor 5 increases continuously in the sixth time period, the electronically controlled valve 38 is controlled to open and close alternately at the eighth frequency.

[0090] Exemplarily, at the eighth frequency: open the electric-controlled valve for 4 seconds-close the electric-controlled valve for 10 seconds-open the electric-controlled valve for 4 seconds-close the electric-controlled valve for 10 seconds-open the electric-controlled valve for 4 seconds-close the electric-controlled valve for 10 seconds….

[0091] S308, if it is detected that the rotation speed of the motor 5 is less than the first rotation speed threshold, the electronically controlled valve 38 is controlled to be continuously opened; wherein the first rotation speed threshold is less than the lower limit of the first rotation speed range in S301.

[0092] That is, if it is determined that the rotation speed of the motor 5 is less than a first relatively small rotation speed threshold, the workload of the control diaphragm 3 is continuously disconnected.

[0093] The first speed threshold is a relatively small value, which is less than the lower limit of the first speed range in this embodiment. When the speed of the motor 5 is less than the very small first speed threshold, it means that the energy of the motor 5 and the flywheel 24 is seriously insufficient, so the electric control valve 38 can be continuously opened to keep the workload of the diaphragm 3 in the disconnected state to avoid serious overload of the motor 5.

[0094] S309, if it is detected that the rotation speed of the motor 5 is greater than the second rotation speed threshold, the electronically controlled valve 38 is controlled to be continuously closed; wherein the second rotation speed threshold is not less than the first rotation speed threshold in S308.

[0095] That is, in the process of continuously disconnecting the workload of the diaphragm 3 , if it is determined that the rotation speed of the motor 5 is greater than the second rotation speed threshold, the workload of the diaphragm 3 is continuously connected.

[0096] It can be understood that in the process of continuously opening the electric control valve 38 in S308, the flywheel 24 is always kept in a no-load energy storage state, and the energy provided by the motor 5 is completely converted into the kinetic energy of the flywheel 24. When the speed of the motor 5 and the flywheel 24 is high enough and the kinetic energy is large enough, if the electric control valve 38 is still kept in the open state, the diaphragm pump will run without load as a whole, resulting in energy waste. Therefore, when the speed of the motor 5 is detected to be greater than the second speed threshold, the embodiment switches the electric control valve 38 from the punching state to the closed state, connects the workload of the diaphragm 3, and allows the diaphragm 3 to work normally.

[0097] The second speed threshold should not be less than the first speed threshold in S301, and is preferably a value greater than the upper limit of the first speed range.

[0098] Obviously, we can also abandon the above strategies of S301-S307 and only use the strategies of S308 and S309 to control the diaphragm pump:

[0099] That is, if it is determined that the speed of the motor 5 is less than the first speed threshold, the workload of the diaphragm 3 is controlled to be continuously disconnected. If it is determined that the speed of the motor 5 is greater than the second speed threshold, the workload of the diaphragm 3 is controlled to be continuously connected; wherein the second speed threshold is not less than the first speed threshold. Under such a control mode, the second speed threshold can usually be equal to the first speed threshold. The disadvantage is that the speed of the motor 5 will be very unstable.

[0100] The controller 35 configured in the diaphragm pump also includes a memory, a processor connected to the memory, and computer instructions stored in the memory and executable by the processor. When the computer instructions are executed by the processor, the control method is implemented.

[0101] Embodiment 2:

[0102] Figure 4 The eighth diaphragm pump is shown, which is particularly suitable for the following situation: the extraction force for extracting the working fluid from the inlet port 6 to the working chamber 1 is much greater than the thrust for pushing the working fluid from the working chamber to the outlet port 7, and the power consumption for extracting the working fluid is much greater than the power consumption for pushing the working fluid. For example, the diaphragm pump is arranged at a high place to extract water from a low place to the high place.

[0103] The structure of the diaphragm pump is similar to that of the first embodiment of the present application, except that:

[0104] In this embodiment, the electrically controlled valve 38 communicating with the controller 35 is disposed between the working chamber 1 and the discharge port 7 and connected in parallel with the discharge valve 9 , rather than being connected between the working chamber 1 and the inlet 6 .

[0105] It can be seen that, in addition to the discharge valve 9 originally provided in the conventional diaphragm pump, the present embodiment additionally provides an electrically controlled valve 38 located between the working chamber 1 and the discharge port 7 .

[0106] In this embodiment, the discharge valve 9 is a mechanical one-way valve. Different from the discharge valve 9 that automatically opens and closes by sensing pressure, the opening and closing of the electric control valve 38 can be controlled by an electric signal that is independent of pressure. In other embodiments, the discharge valve 9 can also be an electric control one-way valve.

[0107] If the electric control valve 38 is in the closed state, the pump head of the diaphragm pump has the same working process as the traditional pump head. At this time, as long as the diaphragm pump has enough energy, it can extract the working fluid from the inlet 6 into the working chamber 1 and then push it to the outlet 7. However, as mentioned above, the power consumption of the diaphragm pump to extract the working fluid is very large, so when the motor 5 rotates at a low speed and the flywheel 24 has insufficient energy storage, the diaphragm pump cannot extract a sufficient amount of the working fluid from the inlet 6 to the working chamber 1. The working fluid or air in the outlet 7 can be extracted to the working chamber 1 with only a small amount of power, so at this time the electric control valve 38 can be opened to reduce the diaphragm 3 in Figure 4 Load with leftward deformation.

[0108] If the electric control valve 38 is in the open state, the piston Figure 4 When the piston moves to the right, the working fluid in the working chamber 1 is easily pushed to the discharge port 7 through the electric control valve 38, and the power consumption of the pushing action is relatively small; Figure 4 When the center moves to the left, the electric control valve 38 is in an open state, and the suction valve 8 is kept in a closed state due to the high opening pressure, so the working fluid (or air) in the discharge port 7 can be easily extracted from the opened electric control valve 38 to the working chamber 1, and the power consumption of the extraction action is also small. This is equivalent to at least partially disconnecting the working load of the diaphragm 3. Therefore, in this process, part of the output power provided by the motor 5 is used to complete the aforementioned pushing and extraction actions, and the other part is used to work on the flywheel 24, so that the flywheel 24 speeds up and stores energy.

[0109] Therefore, this embodiment provides the following control method which is briefly introduced and is basically the same as the first embodiment of the present application. The detailed control method can refer to the content of the first embodiment.

[0110] S401, during the operation of the motor 5, the electrically controlled valve 38 is controlled to be alternately opened and closed at a first frequency.

[0111] Preferably, when it is determined that the rotation speed of the motor 5 is within a set first rotation speed range, the electrically controlled valve 38 is controlled to be alternately opened and closed at a first frequency.

[0112] S402. During the process of controlling the electric control valve 38 to open and close alternately at a first frequency in S401, if it is detected that the rotation speed of the motor 5 decreases continuously within a first time period, the electric control valve 38 is controlled to open and close alternately at a third frequency; wherein the ratio of the closing time to the opening time of the electric control valve 38 in each cycle of the third frequency is less than the ratio of the closing time to the opening time of the electric control valve 38 in each cycle of the first frequency.

[0113] S403, in the process of controlling the electric control valve 38 to open and close alternately at the third frequency in S402, if it is detected that the rotation speed of the motor 5 decreases continuously within the second time period, the electric control valve 38 is controlled to open and close alternately at a fourth frequency. The ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the fourth frequency is less than the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the third frequency.

[0114] S404, in the process of controlling the electric control valve 38 to open and close alternately at the third frequency in S402, if it is detected that the rotation speed of the motor 5 increases continuously within the third time period, the electric control valve 38 is controlled to open and close alternately at the fifth frequency. The ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the first frequency is greater than the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the fifth frequency, and the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the third frequency.

[0115] S405. During the process of controlling the electric control valve 38 to open and close alternately at a first frequency at S401, if it is detected that the rotation speed of the motor 5 increases continuously within a fourth time period, the electric control valve 38 is controlled to open and close alternately at a sixth frequency; wherein the ratio of the closing time to the opening time of the electric control valve 38 in each cycle of the sixth frequency is greater than the ratio of the closing time to the opening time of the electric control valve 38 in each cycle of the first frequency.

[0116] S406, in the process of controlling the electric control valve 38 to open and close alternately at the sixth frequency in S405, if it is detected that the speed of the motor 5 increases continuously within the fifth duration, the electric control valve 38 is controlled to open and close alternately at the seventh frequency. The ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the seventh frequency is greater than the ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the sixth frequency.

[0117] S407, in the process of controlling the electric control valve 38 to alternately open and close at the sixth frequency in S405, if it is detected that the speed of the motor 5 decreases continuously within the sixth duration, the electric control valve 38 is controlled to alternately open and close at the eighth frequency. The ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the sixth frequency is greater than the ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the eighth frequency and greater than the ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the first frequency.

[0118] S408: If it is detected that the rotation speed of the motor 5 is less than a first relatively small rotation speed threshold, the electronically controlled valve 38 is controlled to be continuously opened.

[0119] S409, if it is detected that the speed of the motor 5 is greater than the second speed threshold, the electronically controlled valve 38 is controlled to be continuously closed; wherein the second speed threshold is not less than the first speed threshold in S408. Preferably, the second speed threshold is greater than the upper limit of the first speed range in S401.

[0120] Embodiment three:

[0121] Figure 7 The ninth diaphragm pump is shown, which is also applicable to the situation described in the second embodiment of the present application: the extraction force for extracting the working fluid from the inlet 6 to the working chamber 1 is much greater than the thrust for pushing the working fluid from the working chamber to the outlet 7, and the power consumption for extracting the working fluid is much greater than the power consumption for pushing the working fluid. For example, the diaphragm pump is arranged at a high place to extract water from a low place to the high place.

[0122] The structure of the diaphragm pump is similar to that of the second embodiment of the present application, except that: in this embodiment, no additional electric control valve is added between the working chamber 1 and the discharge port 7, but the discharge valve 9 is set as an electric control one-way valve that is connected to the controller 35 for communication. Figure 8 .

[0123] It is known that the main difference between an electric-controlled one-way valve and an ordinary mechanical one-way valve is that an ordinary mechanical one-way valve directly senses the pressure to open or close, and cannot achieve reverse flow of the fluid. An electric-controlled one-way valve has more functions and applications, mainly including two types: ⅰ, some electric-controlled one-way valves can open (or close) in response to an electric control signal while fully retaining the functions of ordinary mechanical one-way valves; ⅱ, some other electric-controlled one-way valves need to first convert the fluid pressure at the valve into an electric control signal, and then control the opening (or closing) of the valve through the electric control signal. Therefore, as long as the control command is intervened on the electric-controlled one-way valve, the reverse flow of the fluid can be achieved. For example, the Chinese invention patent application with publication number CN108825828A discloses an electric-controlled one-way valve that can actively open the one-way valve by electric control, thereby achieving reverse flow of the fluid.

[0124] Based on the same purpose as the second embodiment of the present application, this embodiment mainly implements the following control method for the diaphragm pump by writing computer instructions into the controller 35:

[0125] S501, during the operation of the motor 5, the discharge valve 9 is controlled to be open for an eighth time period at intervals of a seventh time period.

[0126] That is, during the operation of the motor 5, the discharge valve 9 is alternately opened for the eighth time period - the seventh time period is interval - the discharge valve 9 is opened for the eighth time period - the seventh time period is interval - the discharge valve 9 is opened for the eighth time period - the seventh time period is interval - the discharge valve 9 is opened for the eighth time period .... In effect, it is equivalent to the case in the first and second embodiments of the present application: during the operation of the motor 5, the workload of the diaphragm 3 is alternately disconnected and connected at the first frequency.

[0127] The above-mentioned “opening the discharge valve 9 for the eighth time period” means that the discharge valve 9 is kept in the open state for the eighth time period. “interval for the seventh time period” means that during the seventh time period, the controller 35 does not actively intervene in the action of the discharge valve 9, and allows the discharge valve 9 to operate according to its original characteristics. For example, it is opened or closed according to physical pressure, or opened or closed according to the original electrical control strategy.

[0128] The above-mentioned “allowing the discharge valve 9 to operate according to its original characteristics” generally includes two situations:

[0129] 1) The discharge valve 9 opens or closes according to the physical pressure. In this case, the controller 35 completely removes the interference with the working state of the discharge valve 9, allowing the discharge valve 9 to directly sense the pressure on both sides and automatically open or close. That is, the controller 35 does nothing to the discharge valve 9, allowing the discharge valve 9 to open or close only by non-electrical mechanical force. This is more suitable for the above-mentioned type "i" electric control one-way valve.

[0130] 2) The discharge valve 9 is opened or closed according to the original electrical control strategy. In this case, the controller only needs to remove the above-mentioned active intervention on the discharge valve and adopt the traditional strategy to control the opening and closing of the discharge valve 9. "Adopting the traditional strategy to control the opening and closing of the discharge valve 9" usually means that the controller 35 mainly controls the discharge valve 9 to open or close according to the pressure at the discharge valve 9. This is more suitable for the above-mentioned "ii" type of electrically controlled one-way valve.

[0131] For example, during the operation of the motor, the controller 35 actively opens the discharge valve 9 intermittently in a manner of opening the discharge valve once every 4 seconds and keeping it open for 2 seconds each time. That is, the discharge valve is opened and kept open for 2 seconds - every 4 seconds - the discharge valve is opened and kept open for 2 seconds - every 4 seconds - the discharge valve is opened and kept open for 2 seconds - every 4 seconds - the discharge valve is opened and kept open for 2 seconds...

[0132] During the operation of the motor 5, the controller 35 actively opens the discharge valve 9 intermittently according to the set rhythm, so that the workload of the diaphragm 3 is alternately disconnected and connected according to the set first frequency. In turn, the flywheel 24 and the diaphragm 3 intermittently perform work in each cycle of the first frequency, and the motor 5 periodically stores energy in the flywheel 24. Generally, in each cycle (for example, 4+2=6 seconds in this embodiment), the energy provided by the continuously running motor 5 is balanced with the energy consumption of the diaphragm 3 performing normal work only in a part of the time period (for example, 4 seconds in this embodiment), so that the diaphragm pump can operate continuously and stably.

[0133] It can be understood that when the controller 35 actively controls the discharge valve 9 to open, the workload of the diaphragm 3 is disconnected, and the duration of the discharge valve 9 being actively opened = the disconnection duration of the workload of the diaphragm. When the controller 35 stops actively intervening in the discharge valve 9, the discharge valve 9 operates normally, the workload of the diaphragm 3 is connected, and the interval duration of the controller 35 actively controlling the discharge valve 9 to open = the connection duration of the workload of the diaphragm. For the convenience of description, in this embodiment, the connection duration of the workload of the diaphragm, that is, the interval duration of the controller 35 actively controlling the discharge valve 9 to open, is referred to as the "connection duration of the workload", and the disconnection duration of the workload of the diaphragm is referred to as the "disconnection duration of the workload".

[0134] It is not appropriate to adopt the control strategy of S501 when the speed of the motor 5 is very low (such as just started). Therefore, the control strategy of S501 can be adopted only when the speed of the motor 5 is in the set first speed interval. That is, during the operation of the motor 5, if it is determined that the speed of the motor 5 is in the first speed interval, then in response to the determination, the discharge valve 9 is controlled to open for the eighth time period every seventh time period, so that the workload of the diaphragm 3 is alternately disconnected and connected at the first frequency. It can be understood that the aforementioned first speed interval is preferably an interval near the rated speed of the motor 5. For example, if the rated speed of the motor 5 is 10,000 rpm, the first speed interval can be selected as the interval of 9,000-11,000 rpm.

[0135] Of course, the rhythm of actively opening the discharge valve 9 can also be adjusted when the motor 5 is in different speed ranges. For example, if it is determined that the speed of the motor 5 is in a second speed range that is different from and has no intersection with the first speed range and is smaller than the first speed range, the discharge valve 9 is controlled to be opened for the tenth time period every ninth time period. That is, if it is determined that the speed of the motor 5 is in the second speed range, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at the second frequency.

[0136] S502, in the process of controlling the discharge valve 9 to open for the eighth time period at intervals of the seventh time period in the above S501, if it is detected that the rotation speed of the motor 5 decreases continuously within the first time period, for example, within three minutes, then the discharge valve 9 is controlled to open for the twelfth time period at intervals of the eleventh time period; wherein, the ratio of the eleventh time period to the twelfth time period is less than the ratio of the seventh time period to the eighth time period.

[0137] That is, in the process of controlling the workload of the diaphragm 3 to alternately disconnect and connect the diaphragm 3 at the first frequency, if it is determined that the speed of the motor 5 decreases continuously within the first duration, the workload of the diaphragm 3 is controlled to alternately disconnect and connect at the third frequency. The ratio of the workload connection duration to the disconnection duration in each cycle of the third frequency is less than the ratio of the workload connection duration to the disconnection duration in each cycle of the first frequency.

[0138] S503, in the process of controlling the discharge valve 9 to open for the twelfth time period at every eleventh time period in the above S502, if it is detected that the rotation speed of the motor 5 continuously decreases within the second time period, the discharge valve 9 is controlled to open for the fourteenth time period at every thirteenth time period; wherein, the ratio of the thirteenth time period to the fourteenth time period is less than the ratio of the eleventh time period to the twelfth time period.

[0139] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at a third frequency, if it is determined that the rotational speed of the motor 5 continuously decreases within the second time period, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at a fourth frequency; wherein, the ratio of the connection duration to the disconnection duration of the workload in each cycle of the fourth frequency is less than the ratio of the connection duration to the disconnection duration of the workload in each cycle of the third frequency.

[0140] S504, in the process of controlling the discharge valve 9 to open for the twelfth time period at every eleventh time period in the above S502, if it is detected that the rotation speed of the motor 5 continuously increases within the third time period, the discharge valve 9 is controlled to open for the sixteenth time period at every fifteenth time period; wherein, the ratio of the seventh time period to the eighth time period>the ratio of the fifteenth time period to the sixteenth time period>the ratio of the eleventh time period to the twelfth time period.

[0141] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at a third frequency, if it is determined that the rotational speed of the motor 5 continuously increases within the third time length, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at a fifth frequency; wherein, the ratio of the connection time length to the disconnection time length in each cycle of the first frequency is greater than the ratio of the connection time length to the disconnection time length in each cycle of the fifth frequency is greater than the ratio of the connection time length to the disconnection time length in each cycle of the third frequency.

[0142] S505. In the process of controlling the discharge valve 9 to open for the eighth time period at intervals of the seventh time period in the above S501, if it is detected that the rotation speed of the motor 5 increases continuously within the fourth time period, the discharge valve 9 is controlled to open for the eighteenth time period at intervals of the seventeenth time period; wherein, the ratio of the seventeenth time period to the eighteenth time period is greater than the ratio of the seventh time period to the eighth time period.

[0143] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at a first frequency, if it is determined that the rotational speed of the motor 5 continuously increases within a fourth time period, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at a sixth frequency; wherein, the ratio of the connection duration to the disconnection duration of the workload in each cycle of the sixth frequency is greater than the ratio of the connection duration to the disconnection duration of the workload in each cycle of the first frequency.

[0144] S506, in the process of controlling the discharge valve 9 to open for the eighteenth time period at intervals of the seventeenth time period in the above S505, if it is detected that the speed of the motor 5 increases continuously within the fifth time period, the discharge valve 9 is controlled to open for the twentieth time period at intervals of the nineteenth time period. The ratio of the nineteenth time period to the twentieth time period is greater than the ratio of the seventeenth time period to the eighteenth time period.

[0145] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at the sixth frequency, if it is determined that the rotational speed of the motor 5 continues to increase within the fifth time period, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at the seventh frequency; wherein, the ratio of the connection duration to the disconnection duration of the workload in each cycle of the seventh frequency is greater than the ratio of the connection duration to the disconnection duration of the workload in each cycle of the sixth frequency.

[0146] S507, in the process of controlling the discharge valve 9 to open for the eighteenth time period at intervals of the seventeenth time period in the above S505, if it is detected that the speed of the motor 5 continuously decreases within the sixth time period, the discharge valve 9 is controlled to open for the twenty-second time period at intervals of the twenty-first time period. The ratio of the seventeenth time period to the eighteenth time period>the ratio of the twenty-first time period to the twenty-second time period>the ratio of the seventh time period to the eighth time period.

[0147] That is, in the process of controlling the workload of the diaphragm 3 to be alternately disconnected and connected at the sixth frequency, if it is determined that the rotational speed of the motor 5 continuously increases within the sixth time period, the workload of the diaphragm 3 is controlled to be alternately disconnected and connected at the eighth frequency; wherein, the ratio of the connected time period to the disconnected time period of the workload in each cycle of the sixth frequency is greater than the ratio of the connected time period to the disconnected time period of the workload in each cycle of the eighth frequency is greater than the ratio of the connected time period to the disconnected time period of the workload in each cycle of the first frequency.

[0148] S508, if it is detected that the rotation speed of the motor 5 is less than a first rotation speed threshold value which is relatively small, the discharge valve 9 is controlled to be continuously opened; wherein the first rotation speed threshold value is less than the lower limit of the first rotation speed range in S501.

[0149] S509, if it is detected that the speed of the motor 5 is greater than the second speed threshold, the above-mentioned active intervention of the controller 35 on the discharge valve 9 is removed; wherein the second speed threshold is not less than the first speed threshold in S508, and the second speed threshold is preferably greater than the upper limit of the first speed range in S501.

[0150] In other embodiments, the above strategies of S501-S507 may be abandoned, and only the strategies of S508 and S509 may be used to control the diaphragm pump:

[0151] That is, if it is determined that the speed of the motor 5 is less than the first speed threshold, the workload of the diaphragm 3 is controlled to be continuously disconnected; if it is determined that the speed of the motor 5 is greater than the second speed threshold, the workload of the diaphragm 3 is controlled to be continuously connected; wherein the second speed threshold is not less than the first speed threshold. In such a control mode, the second speed threshold can usually be equal to the first speed threshold.

[0152] The controller 35 includes a memory, a processor connected to the memory, and computer instructions stored in the memory and executable by the processor. When the computer instructions are executed by the processor, the control method is implemented.

[0153] Example 4: Air conditioning system

[0154] Inspired by the above-mentioned second and third embodiments, this embodiment provides another air conditioning system capable of intermittent high-power work. Fig. 9 And refer to Fig.10 As shown, the air conditioning system is provided with an electric control valve 38 connected between the condenser 200 and the evaporator 400 and in parallel with the throttle valve 300. The electric control valve 38 is in communication connection with the controller 35 which is in communication connection with the motor speed sensor 34, so that the controller 35 can control the working state of the electric control valve 38 according to the motor speed. The compressor 100 adopts the same structure as the embodiment 21 in the parent case (application number: CN2021105835430).

[0155] If the electric control valve 38 is kept in the closed state, the working mode of the air conditioning system is the same as that of the conventional air conditioning system. At this time, as long as the diaphragm compressor 100 has sufficient energy, it can pressurize the high-pressure fluid on the upstream side of the throttle valve 300 to the downstream side of the throttle valve 300. However, in some cases, the power consumption of the compressor 100 to compress the working fluid is very large, such as when carbon dioxide is used as a refrigerant. Therefore, when the speed of the motor 5 is low and the energy storage of the flywheel 24 is insufficient, the compressor 100 cannot work normally.

[0156] If the electric control valve 38 is kept in the open state, it is equivalent to "shorting" the throttle valve 300 and removing it from the circuit. The electric control valve 38 without the throttling expansion function allows the working fluid (refrigerant) to flow easily between the condenser 200 and the evaporator 400, and the workload of the compressor 100 is small. Of course, in this case, the air conditioning system has no cooling and heating effects.

[0157] Therefore, this embodiment provides the following control method of the air-conditioning system of this variant example, and its detailed control method can refer to Embodiment 1 and Embodiment 2 of the present application.

[0158] S801, during the operation of the motor of the diaphragm compressor 100, if it is detected that the speed of the motor is in a first speed range, the electrically controlled valve 38 is controlled to be alternately opened and closed at a first frequency.

[0159] Generally, the rated speed of the driving motor in the compressor 100 is within the above-mentioned first speed range.

[0160] Optionally, if it is detected that the speed of the motor is in a second speed interval that does not intersect with the first speed interval and is smaller than the first speed interval, the electric control valve 38 is alternately opened and closed at a second frequency different from the first frequency. The ratio of the opening time length to the closing time length of the electric control valve 38 in each cycle of the second frequency is ≠ the ratio of the opening time length to the closing time length of the electric control valve 38 in each cycle of the first frequency.

[0161] S802. During the process of controlling the electric control valve 38 to open and close alternately at a first frequency at S801, if it is detected that the rotation speed of the motor decreases continuously within a first time period, the electric control valve 38 is controlled to open and close alternately at a third frequency; wherein the ratio of the closing time to the opening time of the electric control valve 38 in each cycle of the third frequency is less than the ratio of the closing time to the opening time of the electric control valve 38 in each cycle of the first frequency.

[0162] S803, in the process of controlling the electric control valve 38 to alternately open and close at the third frequency in S802, if it is detected that the rotation speed of the motor decreases continuously within the second time period, the electric control valve 38 is controlled to alternately open and close at a fourth frequency, wherein the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the fourth frequency is less than the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the third frequency.

[0163] S804, in the process of controlling the electric control valve 38 to open and close alternately at the third frequency in S802, if it is detected that the rotation speed of the motor 5 increases continuously within the third time period, the electric control valve 38 is controlled to open and close alternately at the fifth frequency. The ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the first frequency is greater than the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the fifth frequency, and the ratio of the closing time period to the opening time period of the electric control valve 38 in each cycle of the third frequency.

[0164] S805. During the process of controlling the electric-controlled valve 38 to open and close alternately at a first frequency at S801, if it is detected that the rotation speed of the motor increases continuously within a fourth time period, the electric-controlled valve 38 is controlled to open and close alternately at a sixth frequency; wherein the ratio of the closing time to the opening time of the electric-controlled valve 38 in each cycle of the sixth frequency is greater than the ratio of the closing time to the opening time of the electric-controlled valve 38 in each cycle of the first frequency.

[0165] S806, in the process of controlling the electric control valve 38 to open and close alternately at the sixth frequency in S805, if it is detected that the speed of the motor increases continuously within the fifth duration, the electric control valve 38 is controlled to open and close alternately at the seventh frequency. The ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the seventh frequency is greater than the ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the sixth frequency.

[0166] S807, in the process of controlling the electric control valve 38 to open and close alternately at the sixth frequency in S805, if it is detected that the speed of the motor decreases continuously within the sixth duration, the electric control valve 38 is controlled to open and close alternately at the eighth frequency. The ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the sixth frequency is greater than the ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the eighth frequency and greater than the ratio of the closing duration to the opening duration of the electric control valve 38 in each cycle of the first frequency.

[0167] S808, if it is detected that the rotation speed of the motor 5 is less than a first relatively small rotation speed threshold, the electronically controlled valve 38 is controlled to be continuously opened; wherein the first rotation speed threshold is less than the lower limit of the first rotation speed range in S801.

[0168] S809, if it is detected that the speed of the motor 5 is greater than the second speed threshold, the electronically controlled valve 38 is controlled to remain closed. The second speed threshold is not less than the first speed threshold in S808, and is usually greater than the upper limit of the first speed range in S801.

[0169] In order to simplify control, the electric control valve 38 is preferably a normally closed valve or a normally open valve.

[0170] Fig. 9 and Fig.10 The controller 35 in the embodiment includes a memory, a processor connected to the memory, and computer instructions stored in the aforementioned memory and executable by the aforementioned processor. When the computer instructions are executed by the processor, the above-mentioned control method in this embodiment can be implemented respectively.

Claims

1. A control method for an air conditioning system, the air conditioning system comprising a compressor (100) and a condenser (200) connected in a fluid manner, the compressor (100) being a diaphragm compressor, the compressor (100) comprising: The refrigerant inlet (6) and outlet (7), a working chamber (1) connected between the inlet and the outlet, a suction valve (8) disposed between the inlet port and the working chamber, an electrically controlled valve (38) disposed between the inlet port (6) and the working chamber (1) and connected in parallel with the suction valve (8), Power chamber (2), a diaphragm (3) disposed between the working chamber and the power chamber, a flywheel (24) for providing driving force to the diaphragm, and A motor (5) for providing driving force for the flywheel; Characterized in that the control method comprises: Acquiring the pressure of the condenser (200) in real time; If it is determined that the pressure of the condenser (200) is in the first pressure interval, the electrically controlled valve (38) is controlled to be alternately opened and closed at a first frequency.

2. The control method according to claim 1, characterized in that: The control method further comprises: If it is determined that the pressure of the condenser (200) is in a second pressure range that has no intersection with the first pressure range, the electrically controlled valve (38) is controlled to be alternately opened and closed at a second frequency; wherein the lower limit of the second pressure range is greater than the upper limit of the first pressure range, and the ratio of the duration of the electrically controlled valve (38) being alternately opened and closed at the second frequency in each cycle of the second frequency is less than the ratio of the duration of the electrically controlled valve (38) being alternately opened and closed at the first frequency in each cycle of the first frequency.

3. The control method according to claim 1, characterized in that: The control method further comprises: If it is determined that the pressure of the condenser (200) is greater than a first pressure threshold, controlling the electric control valve (38) to be continuously opened; wherein the first pressure threshold is greater than an upper limit of the first pressure range; If it is determined that the pressure of the condenser (200) is less than a second pressure threshold, the electrically controlled valve (38) is controlled to remain closed; wherein the second pressure threshold is less than a lower limit of the first pressure range.

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