A control method, device, unit and storage medium for a compressor

Abstract

The present invention discloses a control method, device, unit and storage medium for a compressor. The method includes: during the operation of the compressor, determining whether an up-frequency demand for the compressor is received; in the case where it is determined that the up-frequency demand for the compressor has been received, obtaining the suction superheat degree of the compressor, obtaining the suction pressure of the compressor, obtaining the discharge pressure of the compressor, and obtaining the current operating frequency of the compressor; controlling the compressor to operate at an increased frequency based on the current operating frequency of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor. This solution reduces the oil shortage failure rate of the compressor and improves the operating reliability of the compressor and the unit where it is located by optimizing the frequency control logic of the compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and particularly relates to a control method, device, unit and storage medium of a compressor, and more particularly to a frequency increase control method, device, unit and storage medium of a variable frequency compressor in a unit. Background Art

[0002] For a compressor (such as a variable frequency compressor), as the operating frequency of the variable frequency compressor increases, the oil discharge rate of the variable frequency compressor will increase exponentially. Therefore, the variable frequency compressor is prone to oil shortage during high-frequency operation, resulting in compressor failure of the variable frequency compressor.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The purpose of the present invention is to provide a control method, device, unit and storage medium of a compressor, so as to solve the problem that the oil discharge rate of a compressor (such as a variable frequency compressor) increases exponentially as the operating frequency increases, making the variable frequency compressor prone to oil shortage during high-frequency operation, resulting in compressor failure of the variable frequency compressor, and achieve the effect of reducing the compressor failure of the variable frequency compressor caused by oil shortage during high-frequency operation by optimizing the frequency control logic of the variable frequency compressor, which is beneficial to reducing the oil shortage failure rate of the variable frequency compressor and improving the operation reliability of the variable frequency compressor and the unit where it is located.

[0005] The present invention provides a control method of a compressor, including: during the operation of the compressor, determining whether a frequency increase demand of the compressor is received; in the case of determining that the frequency increase demand of the compressor is received, obtaining the suction superheat degree of the compressor, obtaining the suction pressure of the compressor, obtaining the discharge pressure of the compressor, and obtaining the current operating frequency of the compressor; and controlling the compressor to increase the frequency based on the current operating frequency of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor.

[0006] In some embodiments, determining whether a frequency increase demand of the compressor is received includes: determining whether the current environmental parameters of the unit where the compressor is located do not reach the target environmental parameters, and / or determining whether a frequency increase instruction for increasing the frequency of the compressor sent by a user is received; if it is determined that the current environmental parameters of the unit where the compressor is located do not reach the target environmental parameters, and / or it is determined that a frequency increase instruction for increasing the frequency of the compressor sent by the user is received, then it is determined that the frequency increase demand of the compressor is received.

[0007] In some embodiments, controlling the compressor to increase its operating frequency based on the current operating frequency of the compressor, according to the suction superheat of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, includes: determining whether to issue a frequency increase request for controlling the compressor to increase its frequency according to the suction superheat of the compressor and the current operating frequency of the compressor; if it is determined that a frequency increase request for controlling the compressor to increase its frequency needs to be issued, then issuing a frequency increase request for controlling the compressor to increase its frequency, calculating the frequency increase rate of the compressor according to the suction superheat of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, and controlling the compressor to increase its frequency at the frequency increase rate of the compressor based on the current operating frequency of the compressor to respond to the frequency increase request for controlling the compressor to increase its frequency; if it is determined that a frequency increase request for controlling the compressor to increase its frequency does not need to be issued, then adjusting the operating parameters of the unit where the compressor is located, and then returning to continue determining whether the frequency increase demand of the compressor is received.

[0008] In some embodiments, determining whether to issue a frequency increase request for controlling the compressor to increase its frequency according to the suction superheat of the compressor and the current operating frequency of the compressor includes: determining whether the suction superheat of the compressor is greater than or equal to a set value, and determining whether the current operating frequency of the compressor reaches the upper limit of the allowable frequency range of the compressor; if it is determined that the suction superheat of the compressor is greater than or equal to the set value, and it is determined that the current operating frequency of the compressor does not reach the upper limit of the allowable frequency range of the compressor, then it is determined that a frequency increase request for controlling the compressor to increase its frequency needs to be issued; if it is determined that the suction superheat of the compressor is less than the set value, and / or it is determined that the current operating frequency of the compressor has reached the upper limit of the allowable frequency range of the compressor, then it is determined that a frequency increase request for controlling the compressor to increase its frequency does not need to be issued.

[0009] In some embodiments, calculating the frequency increase rate of the compressor according to the suction superheat of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor includes: determining a first ratio of the discharge pressure of the compressor to the suction pressure of the compressor, and determining the result of multiplying the first ratio by the suction superheat of the compressor, and then determining a second ratio of the product to the current operating frequency of the compressor as the frequency increase rate of the compressor.

[0010] Matched with the above method, on the other hand, the present invention provides a control device for a compressor, including: a control unit configured to determine whether a frequency increase demand for the compressor is received during the operation of the compressor; an acquisition unit configured to, when it is determined that the frequency increase demand for the compressor has been received, acquire the suction superheat degree of the compressor, acquire the suction pressure of the compressor, acquire the discharge pressure of the compressor, and acquire the current operating frequency of the compressor; the control unit is further configured to control the compressor to increase its frequency based on the current operating frequency of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor.

[0011] In some embodiments, the control unit determining whether a frequency increase demand for the compressor is received includes: determining whether the current environmental parameters of the unit where the compressor is located have not reached the target environmental parameters, and / or determining whether a frequency increase instruction for increasing the frequency of the compressor sent by the user is received; if it is determined that the current environmental parameters of the unit where the compressor is located have not reached the target environmental parameters, and / or it is determined that a frequency increase instruction for increasing the frequency of the compressor sent by the user is received, then it is determined that the frequency increase demand for the compressor has been received.

[0012] In some embodiments, the control unit controlling the compressor to increase its frequency based on the current operating frequency of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor includes: determining whether a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor according to the suction superheat degree of the compressor and the current operating frequency of the compressor; if it is determined that a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor, then sending a frequency increase request for controlling the compressor to increase its frequency, calculating the frequency increase rate of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, and controlling the compressor to increase its frequency at the frequency increase rate based on the current operating frequency of the compressor to respond to the frequency increase request for controlling the compressor to increase its frequency; if it is determined that a frequency increase request for controlling the compressor to increase its frequency does not need to be sent to the compressor, then adjusting the operating parameters of the unit where the compressor is located, and then returning to continue determining whether the frequency increase demand for the compressor is received.

[0013] In some embodiments, the control unit determines whether to send a frequency increase request for controlling the compressor to increase its frequency based on the suction superheat of the compressor and the current operating frequency of the compressor, including: determining whether the suction superheat of the compressor is greater than or equal to a set value, and determining whether the current operating frequency of the compressor reaches the upper limit of the allowable frequency range of the compressor; if it is determined that the suction superheat of the compressor is greater than or equal to the set value and the current operating frequency of the compressor does not reach the upper limit of the allowable frequency range of the compressor, then it is determined that a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor; if it is determined that the suction superheat of the compressor is less than the set value, and / or it is determined that the current operating frequency of the compressor has reached the upper limit of the allowable frequency range of the compressor, then it is determined that a frequency increase request for controlling the compressor to increase its frequency does not need to be sent to the compressor.

[0014] In some embodiments, the control unit calculates the frequency increase rate of the compressor based on the suction superheat of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, including: determining a first ratio of the discharge pressure of the compressor to the suction pressure of the compressor, and determining the result of multiplying the first ratio by the suction superheat of the compressor and then dividing the result by a second ratio of the current operating frequency of the compressor as the frequency increase rate of the compressor.

[0015] Matched with the above device, on the other hand, the present invention provides a unit, including: the control device of the compressor described above.

[0016] Matched with the above method, on the other hand, the present invention provides a storage medium, the storage medium includes a stored program, wherein, when the program runs, it controls the device where the storage medium is located to execute the control method of the compressor described above.

[0017] Thus, the solution of the present invention, when the variable-frequency compressor needs to increase its frequency, when the suction superheat ΔTs of the variable-frequency compressor reaches the set value (such as the suction superheat ΔTs of the variable-frequency compressor ≥ 1), calculates the frequency increase rate of the variable-frequency compressor based on the suction superheat of the variable-frequency compressor, the discharge pressure of the variable-frequency compressor, the suction pressure of the variable-frequency compressor, and the current operating frequency of the variable-frequency compressor, and controls the variable-frequency compressor to increase its frequency at the calculated frequency increase rate, so as to optimize the frequency control logic of the variable-frequency compressor. Therefore, by optimizing the frequency control logic of the variable-frequency compressor, the effect of reducing the compressor failure of the variable-frequency compressor caused by easy oil shortage during high-frequency operation is achieved, which is beneficial to reducing the oil shortage failure rate of the variable-frequency compressor and improving the operation reliability of the variable-frequency compressor and the unit where it is located.

[0018] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic flow chart of an embodiment of the control method of the compressor of the present invention;

[0021] Figure 2 It is a schematic flow chart of an embodiment of determining whether a frequency increase requirement of the compressor is received in the method of the present invention;

[0022] Figure 3 It is a schematic flow chart of an embodiment of controlling the compressor to operate at a frequency increased based on the current operating frequency of the compressor in the method of the present invention;

[0023] Figure 4 It is a schematic flow chart of an embodiment of determining whether a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor in the method of the present invention;

[0024] Figure 5 It is a schematic structural diagram of an embodiment of the control device of the compressor of the present invention;

[0025] Figure 6 It is a schematic flow chart of an embodiment of the frequency increase control logic of the compressor in the unit of the present invention, specifically a schematic frequency increase logic diagram of the compressor;

[0026] Figure 7 It is a schematic diagram of the relationship curve between the running time and the running frequency when the frequency increase control method of the compressor in the unit of the present invention has a fast frequency increase at low frequencies and a slow frequency increase at high frequencies;

[0027] Figure 8 It is a schematic diagram of the relationship curve between the running time and the oil drainage rate when the frequency increase control method of the compressor in the unit of the present invention effectively reduces the high-frequency oil drainage rate;

[0028] Figure 9 It is a schematic diagram of the oil level under different frequency increase logics, where Figure 9 (a) is a schematic diagram of the oil level under the frequency increase logic in the general solution (i.e., the related solution), Figure 9 (b) is a schematic diagram of the oil level under the frequency increase logic in the solution of the present invention.

[0029] In combination with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0030] 102 - Acquisition unit; 104 - Control unit. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0032] Considering that variable-frequency compressors, such as rotary variable-frequency compressors, scroll variable-frequency compressors, piston compressors, etc., have the characteristic of adjustable operating frequency, generally manifested as the oil discharge rate increasing exponentially with the increase of frequency. The high-frequency oil discharge rate of variable-frequency compressors is mainly affected by the large refrigerant flow rate. If the operating frequency of the variable-frequency compressor is adjusted too quickly, the air flow of the refrigerant flow is disordered, making the components for reducing oil discharge (such as oil baffle plates) not play a good role in blocking oil, resulting in the oil that should not be pumped out of the variable-frequency compressor being discharged from the variable-frequency compressor, so the oil discharge rate of the variable-frequency compressor increases.

[0033] For example: When the variable-frequency compressor is under specific operating conditions, the oil discharge rate of the variable-frequency compressor is particularly prominent, such as reaching the following conditions:

[0034] 1) The variable-frequency compressor is operating at a relatively high frequency and the frequency is being adjusted rapidly. For example, the variable-frequency compressor is operating at a frequency of 80 Hz and the frequency is adjusted to 120 Hz within 40 s; or the variable-frequency compressor is in a situation of continuous large-range frequency adjustment. For example, the variable-frequency compressor is operating at a frequency of 30 Hz and the frequency is continuously adjusted to 120 Hz within 90 s.

[0035] 2) The exhaust and suction pressure ratio of the variable-frequency compressor is at a relatively low level. Especially when the evaporation temperature of the unit where the variable-frequency compressor is located, such as an air-conditioning system, is relatively high, at the start-up stage, for example, the suction pressure is 1.0 and the exhaust pressure is 1.6.

[0036] 3) At the start-up stage of the variable-frequency compressor, due to the gradual establishment of the exhaust and suction pressure difference, in order to adjust the variable-frequency compressor to the maximum working state as soon as possible according to customer requirements, continuous rapid frequency increase will be adopted. As described in conditions 1) and 2) above, at this time, the variable-frequency compressor will have a relatively high oil discharge rate, quickly emptying the refrigerant oil in the variable-frequency compressor and causing oil shortage and damage.

[0037] In some solutions, the operating frequency of the variable-frequency compressor is reduced by changing the configuration of the variable-frequency compressor or the unit (i.e., the unit where the variable-frequency compressor is located, such as the air-conditioning system where the variable-frequency compressor is located), but this will increase the cost and is not universal. For example, increasing the displacement of the large variable-frequency compressor to reduce the compressor operating frequency, or increasing the number of condensers and evaporators in the air-conditioning system where the variable-frequency compressor is located to improve the heat exchange efficiency and thus reduce the compressor frequency will both increase the cost and have poor universality.

[0038] Therefore, the solution of the present invention provides a control method for a compressor, specifically a frequency increase control method for a variable-frequency compressor in a unit, so as to optimize the frequency control logic of the variable-frequency compressor, reduce the compressor failure caused by easy oil shortage during high-frequency operation of the variable-frequency compressor, be beneficial to reducing the oil shortage failure rate of the compressor, and improving the operation reliability of the compressor and the unit where it is located.

[0039] According to an embodiment of the present invention, a control method for a compressor is provided, as Figure 1 shown in the flowchart of an embodiment of the method of the present invention. The control method for the compressor may include: step S110 to step S130.

[0040] In step S110, during the operation of the compressor, specifically during the process of the compressor operating stably at the current operating frequency of the compressor, it is determined whether a frequency increase demand for the compressor is received. The frequency increase demand for the compressor is a demand to increase the frequency of the compressor.

[0041] In some embodiments, in combination with Figure 2 the flowchart of an embodiment of determining whether a frequency increase demand for the compressor is received in the method of the present invention shown, the specific process of determining whether a frequency increase demand for the compressor is received in step S110 is further described, including: step S210 to step S230.

[0042] Step S210, determine whether the current environmental parameters of the unit where the compressor is located have not reached the target environmental parameters, and / or determine whether a frequency increase instruction for increasing the frequency of the compressor sent by the user is received. The current environmental parameters and target environmental parameters of the unit where the compressor is located, such as the current indoor temperature and the target indoor temperature of the air-conditioning system. The frequency increase instruction for increasing the frequency of the compressor sent by the user, such as when the user changes the target environmental parameters and the compressor needs to increase its frequency.

[0043] Step S220, if it is determined that the current environmental parameters of the unit where the compressor is located have not reached the target environmental parameters, and / or it is determined that a frequency increase instruction for increasing the frequency of the compressor sent by the user has been received, then it is determined that a frequency increase demand for the compressor has been received.

[0044] Specifically, Figure 6 is a schematic flowchart of an embodiment of the frequency increase control logic of the compressor in the unit of the present invention, specifically a schematic diagram of the frequency increase logic of the compressor. As Figure 6 shown, in the solution of the present invention, the process of controlling the frequency adjustment of the variable frequency compressor includes:

[0045] Step 1: After the unit where the variable frequency compressor is located, such as an air conditioning system, is powered on, the variable frequency compressor starts and runs, and then step 2 is executed.

[0046] Step 2: After the variable frequency compressor runs stably, the variable frequency compressor runs normally, and then step 3 is executed.

[0047] Step 3: Determine whether a frequency increase demand sent by the unit, such as an air conditioning system, to the variable frequency compressor is received. If so, step 4 is executed; otherwise, return to step 2.

[0048] Specifically, due to changes in the environment where the unit, such as an air conditioning system, is located or changes in customer requirements, when the controller of the unit, such as an air conditioning system, detects changes in the environment where the unit, such as an air conditioning system, is located or changes in customer requirements, it is considered that a frequency increase demand sent by the unit, such as an air conditioning system, to the variable frequency compressor is received, and then step 4 is executed.

[0049] At step S120, when it is determined that the frequency increase demand of the compressor has been received, obtain the suction superheat degree of the compressor, obtain the suction pressure of the compressor, obtain the discharge pressure of the compressor, and obtain the current operating frequency of the compressor. Among them, the suction superheat degree of the compressor is, for example, the suction superheat degree ΔTs of the variable frequency compressor, the suction pressure of the compressor is, for example, the suction pressure Ps of the variable frequency compressor, the discharge pressure of the compressor is, for example, the discharge pressure Pd of the variable frequency compressor, and the current operating frequency of the compressor is, for example, the current operating frequency F0 of the variable frequency compressor. Of course, when it is determined that the frequency increase demand of the compressor has not been received, continue to control the compressor to operate at the current operating frequency of the compressor.

[0050] At step S130, control the compressor to increase its frequency based on the current operating frequency of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor.

[0051] For the solution of the present invention, in order to balance the reliability of the variable-frequency compressor and customer requirements, a frequency increase control method for the variable-frequency compressor in a unit is provided. When the variable-frequency compressor needs to increase its frequency, the frequency increase rate of the variable-frequency compressor is calculated according to a pre-set rate algorithm for the frequency increase of the variable-frequency compressor, so as to optimize the frequency control logic of the variable-frequency compressor, reduce the compressor failure of the variable-frequency compressor caused by easy oil shortage during high-frequency operation, be beneficial to reducing the oil shortage failure rate of the variable-frequency compressor, improve the operation reliability of the variable-frequency compressor and the unit where it is located, and have low cost and strong applicability.

[0052] In some embodiments, for the specific process of controlling the compressor to increase its frequency based on the current operating frequency of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor in step S130, refer to the following exemplary description.

[0053] The following combines Figure 3 The schematic flow chart of an embodiment of the method of the present invention for controlling the compressor to increase its frequency based on the current operating frequency of the compressor is shown to further illustrate the specific process of controlling the compressor to increase its frequency based on the current operating frequency of the compressor in step S130, including: step S310 to step S330.

[0054] Step S310, determine whether a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor according to the suction superheat degree of the compressor and the current operating frequency of the compressor.

[0055] In some embodiments, for the specific process of determining whether a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor according to the suction superheat degree of the compressor and the current operating frequency of the compressor in step S310, refer to the following exemplary description.

[0056] The following combines Figure 4 The schematic flow chart of an embodiment of the method of the present invention for determining whether a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor is shown to further illustrate the specific process of determining whether a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor in step S310, including: step S410 to step S430.

[0057] Step S410, determine whether the suction superheat degree of the compressor is greater than or equal to a set value, and determine whether the current operating frequency of the compressor reaches the upper limit of the allowable frequency range of the compressor.

[0058] Step S420: If it is determined that the suction superheat of the compressor is greater than or equal to the set value, and it is determined that the current operating frequency of the compressor has not reached the upper limit of the allowable frequency range of the compressor, then it is determined that a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor.

[0059] Step S430: If it is determined that the suction superheat of the compressor is less than the set value, and / or it is determined that the current operating frequency of the compressor has reached the upper limit of the allowable frequency range of the compressor, then it is determined that a frequency increase request for controlling the compressor to increase its frequency does not need to be sent to the compressor.

[0060] Specifically, as Figure 6 shown, the process of controlling the frequency adjustment of the variable-frequency compressor in the solution of the present invention further includes:

[0061] Step 4: When it is determined that a frequency increase request of the variable-frequency compressor is received, obtain the suction superheat ΔTs of the variable-frequency compressor, and determine whether the suction superheat ΔTs of the variable-frequency compressor is ≥ the set value such as 1: If so, execute Step 5; otherwise, execute Step 7.

[0062] Step 5: When the suction superheat ΔTs of the variable-frequency compressor is ≥ the set value such as 1, determine that a frequency increase request needs to be sent to the variable-frequency compressor, and the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, sends a frequency increase request to the variable-frequency compressor.

[0063] Step S320: If it is determined that a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor, then send a frequency increase request for controlling the compressor to increase its frequency. Calculate the frequency increase rate of the compressor according to the suction superheat of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, and control the compressor to increase its frequency based on the current operating frequency of the compressor at the frequency increase rate of the compressor to respond to the frequency increase request for controlling the compressor to increase its frequency.

[0064] In some embodiments, calculating the frequency increase rate of the compressor according to the suction superheat of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor in Step S320 includes: determining a first ratio of the discharge pressure of the compressor to the suction pressure of the compressor, and determining the result of multiplying the first ratio by the suction superheat of the compressor and then dividing by a second ratio of the current operating frequency of the compressor as the frequency increase rate of the compressor.

[0065] Specifically, as Figure 6As shown, in the solution of the present invention for controlling the frequency adjustment of a variable-frequency compressor, the process further includes: In step 5, when the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, sends a frequency increase request to the variable-frequency compressor, the process of calculating the frequency increase rate v of the variable-frequency compressor is specifically: Obtain the current operating frequency F0 of the variable-frequency compressor, obtain the discharge pressure Pd of the variable-frequency compressor, obtain the suction pressure Ps of the variable-frequency compressor, and calculate the frequency increase rate v of the variable-frequency compressor according to the frequency increase rate algorithm of the variable-frequency compressor v = ΔTs * (Pd / Ps) / F0, and then execute step 6. Wherein, the current operating frequency F0 of the variable-frequency compressor ≤ the upper limit of the allowable frequency range of the variable-frequency compressor.

[0066] Wherein, v is the frequency increase rate of the compressor, with the unit Hz / s. ΔTs is the suction superheat degree, with the unit of °C. ΔTs = the suction temperature of the variable-frequency compressor - the saturation temperature corresponding to the suction pressure of the variable-frequency compressor, and the value ΔTs ≥ 1. Pd is the discharge pressure, with the unit Mpa. Ps is the suction pressure, with the unit Mpa. F0 is the current operating frequency of the variable-frequency compressor.

[0067] Step S330, if it is determined that there is no need to send a frequency increase request for controlling the frequency increase of the compressor to the compressor, then adjust the operating parameters of the unit where the compressor is located, and then return to continue to determine whether the frequency increase demand of the compressor is received, so as to realize the cyclic control of the frequency of the compressor.

[0068] Specifically, as Figure 6 shown, in the solution of the present invention for controlling the frequency adjustment of a variable-frequency compressor, the process further includes:

[0069] In steps 4 and 5, when it is determined that a frequency increase request needs to be sent to the variable-frequency compressor, the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, sends a frequency increase request to the variable-frequency compressor and calculates the frequency increase rate v of the variable-frequency compressor.

[0070] Step 6, control the variable-frequency compressor to increase the frequency at the calculated frequency increase rate v of the variable-frequency compressor. After that, the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, exits the frequency increase request sent to the variable-frequency compressor and returns to step 3 to cyclically control the frequency of the variable-frequency compressor.

[0071] Step 7, when the suction superheat degree ΔTs of the variable-frequency compressor < a set value such as 1, adjust the operating parameters of the unit where the variable-frequency compressor is located, such as an air-conditioning system, such as the opening degree of the expansion valve, the fan speed, etc., and then return to step 4 to cyclically determine whether the suction superheat degree ΔTs of the variable-frequency compressor ≥ the set value such as 1 until the suction superheat degree ΔTs of the variable-frequency compressor ≥ the set value such as 1.

[0072] For example: The controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, detects the frequency increase requirement of the variable-frequency compressor. For example, it is necessary to increase the current operating frequency F0 of the variable-frequency compressor to 120 Hz. The controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, determines whether the current conditions are met: the current operating frequency F0 of the variable-frequency compressor = 10 Hz ≤ the frequency upper limit of 120 Hz, the suction pressure Ps of the variable-frequency compressor = 1.0, the suction temperature of the variable-frequency compressor is 15 °C, the suction superheat ΔTs of the variable-frequency compressor = 5 °C, and the discharge pressure Pd of the variable-frequency compressor = 1.6. Furthermore, when the suction superheat ΔTs of the variable-frequency compressor = 5 ≥ the set value, such as 1, the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, sends a frequency increase request to the variable-frequency compressor. The variable-frequency compressor increases its frequency at a rate of v = ΔTs*(Pd / Ps) / F0 and exits the frequency increase request after the frequency increase is completed.

[0073] Figure 7 It is a schematic diagram of the relationship curve between the running time and the running frequency of the frequency increase control method of the compressor in the unit of the present invention when the frequency increase is fast at low frequencies and slow at high frequencies. During the process of the variable-frequency compressor increasing its frequency at a rate of v = ΔTs*(Pd / Ps) / F0, the frequency change process of the variable-frequency compressor is as Figure 7 shown. The solution of the present invention improves the frequency increase rate of the compressor at low frequencies and reduces the frequency increase rate of the compressor at high frequencies to achieve the effect of reducing the oil drainage rate at high frequencies. In this way, according to the algorithm v = ΔTs*(Pd / Ps) / F0, the frequency increase rate is high at low frequencies and low at high frequencies.

[0074] Figure 8 It is a schematic diagram of the relationship curve between the running time and the oil drainage rate of the frequency increase control method of the variable-frequency compressor in the unit of the present invention under the condition of effectively reducing the high-frequency oil drainage rate. During the process of controlling the frequency increase of the variable-frequency compressor according to the solution of the present invention, the oil drainage amount is as Figure 8 , and the solution of the present invention has a smooth transition at high frequencies, enabling better control of the oil drainage amount and avoiding oil shortage damage to the variable-frequency compressor.

[0075] Figure 9 It is a schematic diagram of the oil level under different frequency increase logics. Among them, Figure 9 (a) is a schematic diagram of the oil level under the frequency increase logic in the general solution (i.e., the related solution), Figure 9 (b) is a schematic diagram of the oil level under the frequency increase logic in the solution of the present invention. During the process of the variable-frequency compressor increasing its frequency, the lowest oil level of the variable-frequency compressor is as Figure 9 , and by observing through the sight glass on the variable-frequency compressor, the lowest oil level of the variable-frequency compressor can always maintain an oil liquid level during the process of the variable-frequency compressor increasing its frequency in the solution of the present invention.

[0076] Adopting the technical solution of this embodiment, when the frequency of the variable-frequency compressor needs to be increased, when the suction superheat ΔTs of the variable-frequency compressor reaches a set value (such as the suction superheat ΔTs of the variable-frequency compressor ≥ 1), according to the suction superheat of the variable-frequency compressor, the discharge pressure of the variable-frequency compressor, the suction pressure of the variable-frequency compressor, and the current operating frequency of the variable-frequency compressor, calculate the frequency increase rate of the variable-frequency compressor, and control the variable-frequency compressor to increase its frequency at the calculated frequency increase rate, so as to optimize the frequency control logic of the variable-frequency compressor. Thus, by optimizing the frequency control logic of the variable-frequency compressor, the effect of reducing the compressor failure of the variable-frequency compressor caused by easy oil shortage during high-frequency operation is achieved, which is beneficial to reducing the oil shortage failure rate of the variable-frequency compressor and improving the operating reliability of the variable-frequency compressor and the unit where it is located.

[0077] According to an embodiment of the present invention, there is also provided a control device for a compressor corresponding to the control method of the compressor. Refer to Figure 5 The structural schematic diagram of an embodiment of the device of the present invention shown. The control device for the compressor may include: an acquisition unit 102 and a control unit 104.

[0078] Among them, the control unit 104 is configured to determine whether a frequency increase demand of the compressor is received during the operation of the compressor, specifically during the process of the compressor operating stably at the current operating frequency of the compressor. The frequency increase demand of the compressor is a demand to increase the frequency of the compressor. The specific functions and processes of this control unit 104 are referred to step S110.

[0079] In some embodiments, the control unit 104 determines whether a frequency increase demand of the compressor is received, including:

[0080] The control unit 104 is specifically further configured to determine whether the current environmental parameters of the unit where the compressor is located have not reached the target environmental parameters, and / or determine whether a frequency increase instruction for increasing the frequency of the compressor sent by the user is received. The current environmental parameters and target environmental parameters of the unit where the compressor is located, such as the current indoor temperature and the target indoor temperature of the air-conditioning system. The frequency increase instruction for increasing the frequency of the compressor sent by the user, such as when the user changes the target environmental parameters and the compressor needs to increase its frequency. The specific functions and processes of this control unit 104 are also referred to step S210.

[0081] The control unit 104 is specifically further configured to, if it is determined that the current environmental parameters of the unit where the compressor is located have not reached the target environmental parameters, and / or it is determined that a frequency increase instruction for increasing the frequency of the compressor sent by the user has been received, then determine that the frequency increase demand of the compressor has been received. The specific functions and processes of this control unit 104 are also referred to step S220.

[0082] Specifically, Figure 6 is a schematic flowchart of an embodiment of the frequency increase control logic of the compressor in the unit of the present invention, specifically a schematic diagram of the frequency increase logic of the compressor. As Figure 6 shown, in the solution of the present invention, the process of controlling the frequency adjustment of the variable frequency compressor includes:

[0083] Step 1: After the unit where the variable frequency compressor is located, such as an air conditioning system, is powered on, the variable frequency compressor starts and runs, and then step 2 is executed.

[0084] Step 2: After the variable frequency compressor runs stably, the variable frequency compressor runs normally, and then step 3 is executed.

[0085] Step 3: Determine whether a frequency increase demand is received from the unit, such as an air conditioning system, to the variable frequency compressor. If so, execute step 4; otherwise, return to step 2.

[0086] Specifically, due to changes in the environment where the unit, such as an air conditioning system, is located or changes in customer requirements, when the controller of the unit, such as an air conditioning system, detects changes in the environment where the unit, such as an air conditioning system, is located or changes in customer requirements, it is considered that a frequency increase demand is received from the unit, such as an air conditioning system, to the variable frequency compressor, and then step 4 is executed.

[0087] An acquisition unit 102 is configured to, when it is determined that a frequency increase demand of the compressor has been received, acquire the suction superheat degree of the compressor, acquire the suction pressure of the compressor, acquire the discharge pressure of the compressor, and acquire the current operating frequency of the compressor. Wherein, the suction superheat degree of the compressor is, for example, the suction superheat degree ΔTs of the variable frequency compressor, the suction pressure of the compressor is, for example, the suction pressure Ps of the variable frequency compressor, the discharge pressure of the compressor is, for example, the discharge pressure Pd of the variable frequency compressor, and the current operating frequency of the compressor is, for example, the current operating frequency F0 of the variable frequency compressor. Of course, when it is determined that the frequency increase demand of the compressor has not been received, continue to control the compressor to operate at the current operating frequency of the compressor. For the specific functions and processing of this acquisition unit 102, refer to step S120.

[0088] The control unit 104 is further configured to control the compressor to increase its frequency based on the current operating frequency of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor. For the specific functions and processing of this control unit 104, refer to step S130.

[0089] For the solution of the present invention, in order to balance the reliability of the variable-frequency compressor and customer requirements, a frequency increase control device for the variable-frequency compressor in a unit is provided. When the variable-frequency compressor needs to increase its frequency, the frequency increase rate of the variable-frequency compressor is calculated according to a pre-set rate algorithm for increasing the frequency of the variable-frequency compressor, so as to optimize the frequency control logic of the variable-frequency compressor, reduce the compressor failure of the variable-frequency compressor caused by easy oil shortage during high-frequency operation, be beneficial to reducing the oil shortage failure rate of the variable-frequency compressor, improving the operation reliability of the variable-frequency compressor and the unit where it is located, and having low cost and strong applicability.

[0090] In some embodiments, the control unit 104 controls the compressor to increase its frequency based on the current operating frequency of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, including:

[0091] The control unit 104 is specifically further configured to determine whether to issue a frequency increase request for controlling the compressor to increase its frequency according to the suction superheat degree of the compressor and the current operating frequency of the compressor. For the specific functions and processes of this control unit 104, refer to step S310.

[0092] In some embodiments, the control unit 104 determines whether to issue a frequency increase request for controlling the compressor to increase its frequency according to the suction superheat degree of the compressor and the current operating frequency of the compressor, including:

[0093] The control unit 104 is specifically further configured to determine whether the suction superheat degree of the compressor is greater than or equal to a set value, and determine whether the current operating frequency of the compressor reaches the upper limit of the allowable frequency range of the compressor. For the specific functions and processes of this control unit 104, refer to step S410.

[0094] The control unit 104 is specifically further configured to, if it is determined that the suction superheat degree of the compressor is greater than or equal to the set value and it is determined that the current operating frequency of the compressor does not reach the upper limit of the allowable frequency range of the compressor, determine that a frequency increase request for controlling the compressor to increase its frequency needs to be issued. For the specific functions and processes of this control unit 104, refer to step S420.

[0095] The control unit 104 is specifically further configured to, if it is determined that the suction superheat degree of the compressor is less than the set value, and / or it is determined that the current operating frequency of the compressor has reached the upper limit of the allowable frequency range of the compressor, determine that a frequency increase request for controlling the compressor to increase its frequency does not need to be issued. For the specific functions and processes of this control unit 104, refer to step S430.

[0096] Specifically, as Figure 6 shown, in the solution of the present invention for controlling the frequency adjustment of the variable-frequency compressor, it further includes:

[0097] Step 4: When it is determined that a frequency increase request of the variable-frequency compressor is received, obtain the suction superheat degree ΔTs of the variable-frequency compressor, and determine whether the suction superheat degree ΔTs of the variable-frequency compressor is ≥ a set value such as 1: If so, execute Step 5; otherwise, execute Step 7.

[0098] Step 5: When the suction superheat degree ΔTs of the variable-frequency compressor is ≥ a set value such as 1, determine that a frequency increase request needs to be sent to the variable-frequency compressor, and the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, sends a frequency increase request to the variable-frequency compressor.

[0099] The control unit 104 is specifically further configured to, if it is determined that a frequency increase request for controlling the frequency increase of the compressor needs to be sent to the compressor, send a frequency increase request for controlling the frequency increase of the compressor, calculate the frequency increase rate of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, and control the compressor to increase the frequency at the frequency increase rate on the basis of the current operating frequency of the compressor to respond to the frequency increase request for controlling the frequency increase of the compressor. For the specific functions and processes of this control unit 104, refer to Step S320.

[0100] In some embodiments, the control unit 104 calculates the frequency increase rate of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, including: The control unit 104 is specifically further configured to determine a first ratio of the discharge pressure of the compressor to the suction pressure of the compressor, and determine the result of multiplying the first ratio by the suction superheat degree of the compressor and then dividing by a second ratio of the current operating frequency of the compressor as the frequency increase rate of the compressor.

[0101] Specifically, as Figure 6As shown, in the solution of the present invention for controlling the frequency adjustment of the variable-frequency compressor, the process further includes: In step 5, when the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, sends a frequency increase request to the variable-frequency compressor, the process of calculating the frequency increase rate v of the variable-frequency compressor is specifically as follows: Obtain the current operating frequency F0 of the variable-frequency compressor, obtain the discharge pressure Pd of the variable-frequency compressor, obtain the suction pressure Ps of the variable-frequency compressor, and calculate the frequency increase rate v of the variable-frequency compressor according to the frequency increase rate algorithm of the variable-frequency compressor v = ΔTs * (Pd / Ps) / F0, and then execute step 6. Among them, the current operating frequency F0 of the variable-frequency compressor ≤ the upper limit of the allowable frequency range of the variable-frequency compressor.

[0102] Among them, v is the compressor frequency increase rate, with the unit Hz / s. ΔTs is the suction superheat degree, with the unit of °C. ΔTs = the suction temperature of the variable-frequency compressor - the saturation temperature corresponding to the suction pressure of the variable-frequency compressor, and the value of ΔTs ≥ 1. Pd is the discharge pressure, with the unit Mpa. Ps is the suction pressure, with the unit Mpa. F0 is the current operating frequency of the variable-frequency compressor.

[0103] The control unit 104 is specifically further configured to, if it is determined that there is no need to send a frequency increase request for controlling the compressor frequency increase to the compressor, adjust the operating parameters of the unit where the compressor is located, and then return to continue determining whether the frequency increase demand of the compressor is received, so as to realize the cyclic control of the frequency of the compressor. For the specific functions and processing of this control unit 104, refer to step S330.

[0104] Specifically, as Figure 6 shown, in the solution of the present invention for controlling the frequency adjustment of the variable-frequency compressor, the process further includes:

[0105] In steps 4 and 5, when it is determined that a frequency increase request needs to be sent to the variable-frequency compressor, the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, sends a frequency increase request to the variable-frequency compressor and calculates the frequency increase rate v of the variable-frequency compressor.

[0106] Step 6: Control the variable-frequency compressor to increase the frequency at the calculated frequency increase rate v of the variable-frequency compressor. After that, the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, exits the frequency increase request sent to the variable-frequency compressor and returns to step 3 to cyclically control the frequency of the variable-frequency compressor.

[0107] Step 7: When the suction superheat degree ΔTs of the variable-frequency compressor < a set value such as 1, adjust the operating parameters of the unit where the variable-frequency compressor is located, such as an air-conditioning system, and then return to step 4 to cyclically determine whether the suction superheat degree ΔTs of the variable-frequency compressor ≥ the set value such as 1 until the suction superheat degree ΔTs of the variable-frequency compressor ≥ the set value such as 1.

[0108] For example: The controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, detects the frequency increase requirement of the variable-frequency compressor. For example, it is necessary to increase the current operating frequency F0 of the variable-frequency compressor to 120 Hz. The controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, determines whether the current conditions are met: the current operating frequency F0 of the variable-frequency compressor = 10 Hz ≤ the frequency upper limit of 120 Hz, the suction pressure Ps of the variable-frequency compressor = 1.0, the suction temperature of the variable-frequency compressor is 15 °C, the suction superheat ΔTs of the variable-frequency compressor = 5 °C, and the discharge pressure Pd of the variable-frequency compressor = 1.6. Furthermore, when the suction superheat ΔTs of the variable-frequency compressor = 5 ≥ the set value, such as 1, the controller of the unit where the variable-frequency compressor is located, such as an air-conditioning system, sends a frequency increase request to the variable-frequency compressor. The variable-frequency compressor increases its frequency at a frequency increase rate v = ΔTs*(Pd / Ps) / F0 and exits the frequency increase request after the frequency increase is completed.

[0109] Figure 7 It is a schematic diagram of the relationship curve between the operating time and the operating frequency of the frequency increase control device of the compressor in the unit of the present invention when the frequency increases rapidly at low frequencies and slowly at high frequencies. During the process of the variable-frequency compressor increasing its frequency at a frequency increase rate v = ΔTs*(Pd / Ps) / F0, the frequency change process of the variable-frequency compressor is as Figure 7 shown. The solution of the present invention increases the frequency increase rate during the frequency increase process with low oil discharge at low frequencies and reduces the frequency increase rate at high frequencies with high oil discharge rate, so as to achieve the effect of reducing the oil discharge rate at high frequencies.

[0110] Figure 8 It is a schematic diagram of the relationship curve between the operating time and the oil discharge rate of the frequency increase control device of the variable-frequency compressor in the unit of the present invention when effectively reducing the oil discharge rate at high frequencies. During the process of controlling the frequency increase of the variable-frequency compressor according to the solution of the present invention, the oil discharge amount is as Figure 8 , and the solution of the present invention has a smooth transition at high frequencies, so that the oil discharge amount can be better controlled, and the variable-frequency compressor is prevented from being damaged due to lack of oil.

[0111] Figure 9 It is a schematic diagram of the oil level under different frequency increase logics. Among them, Figure 9 (a) is a schematic diagram of the oil level under the frequency increase logic in the general solution (i.e., the related solution), Figure 9 (b) is a schematic diagram of the oil level under the frequency increase logic in the solution of the present invention. During the process of the variable-frequency compressor increasing its frequency, the lowest oil level of the variable-frequency compressor is as Figure 9 , and when observing through the sight glass on the variable-frequency compressor, the lowest oil level of the variable-frequency compressor can always maintain an oil liquid level during the process of the variable-frequency compressor increasing its frequency in the solution of the present invention.

[0112] Since the processing and functions realized by the device in this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments and will not be elaborated here.

[0113] Adopting the technical solution of the present invention, when the frequency of the variable-frequency compressor needs to be increased and the suction superheat ΔTs of the variable-frequency compressor reaches a set value (such as the suction superheat ΔTs of the variable-frequency compressor ≥ 1), the frequency increase rate of the variable-frequency compressor is calculated according to the suction superheat of the variable-frequency compressor, the discharge pressure of the variable-frequency compressor, the suction pressure of the variable-frequency compressor, and the current operating frequency of the variable-frequency compressor, and the variable-frequency compressor is controlled to increase the frequency at the calculated frequency increase rate, so as to optimize the frequency control logic of the variable-frequency compressor, improve the operating reliability of the variable-frequency compressor, and have low cost and strong versatility.

[0114] According to an embodiment of the present invention, a unit corresponding to the control device of the compressor is further provided. The unit may include: the control device of the compressor described above.

[0115] Since the processing and functions implemented by the unit in this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing device, for the details not described in the description of this embodiment, reference may be made to the relevant descriptions in the foregoing embodiments and will not be elaborated herein.

[0116] Adopting the technical solution of the present invention, when the frequency of the variable-frequency compressor needs to be increased and the suction superheat ΔTs of the variable-frequency compressor reaches a set value (such as the suction superheat ΔTs of the variable-frequency compressor ≥ 1), the frequency increase rate of the variable-frequency compressor is calculated according to the suction superheat of the variable-frequency compressor, the discharge pressure of the variable-frequency compressor, the suction pressure of the variable-frequency compressor, and the current operating frequency of the variable-frequency compressor, and the variable-frequency compressor is controlled to increase the frequency at the calculated frequency increase rate, so as to optimize the frequency control logic of the variable-frequency compressor, which is beneficial to improving the operating reliability of the variable-frequency compressor and the unit where it is located.

[0117] According to an embodiment of the present invention, a storage medium corresponding to the control method of the compressor is further provided. The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the control method of the compressor described above.

[0118] Since the processing and functions implemented by the storage medium in this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, for the details not described in the description of this embodiment, reference may be made to the relevant descriptions in the foregoing embodiments and will not be elaborated herein.

[0119] Adopting the technical solution of the present invention, when the frequency of the variable-frequency compressor needs to be increased, when the suction superheat ΔTs of the variable-frequency compressor reaches a set value (such as the suction superheat ΔTs of the variable-frequency compressor ≥ 1), according to the suction superheat of the variable-frequency compressor, the discharge pressure of the variable-frequency compressor, the suction pressure of the variable-frequency compressor, and the current operating frequency of the variable-frequency compressor, calculate the frequency increase rate of the variable-frequency compressor, and control the variable-frequency compressor to increase the frequency at the calculated frequency increase rate, so as to optimize the frequency control logic of the variable-frequency compressor, reduce the oil shortage failure rate of the variable-frequency compressor, and have low cost and strong applicability.

[0120] In summary, it is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0121] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A control method for a compressor, characterized in that, comprising: During the operation of the compressor, determining whether a frequency increase requirement for the compressor is received; When it is determined that the frequency increase requirement for the compressor has been received, obtaining the suction superheat degree of the compressor, obtaining the suction pressure of the compressor, obtaining the discharge pressure of the compressor, and obtaining the current operating frequency of the compressor; Based on the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, controlling the compressor to increase its frequency on the basis of the current operating frequency of the compressor; by calculating the frequency increase rate of the variable-frequency compressor according to the suction superheat degree of the variable-frequency compressor, the discharge pressure of the variable-frequency compressor, the suction pressure of the variable-frequency compressor, and the current operating frequency of the variable-frequency compressor, and controlling the variable-frequency compressor to increase its frequency at the calculated frequency increase rate, so as to optimize the frequency control logic of the variable-frequency compressor.

2. The control method for a compressor according to claim 1, characterized in that, Determining whether a frequency increase requirement for the compressor is received includes: Determining whether the current environmental parameters of the unit where the compressor is located have not reached the target environmental parameters, and / or determining whether a frequency increase instruction for increasing the frequency of the compressor sent by the user is received; If it is determined that the current environmental parameters of the unit where the compressor is located have not reached the target environmental parameters, and / or it is determined that a frequency increase instruction for increasing the frequency of the compressor sent by the user has been received, then it is determined that the frequency increase requirement for the compressor has been received.

3. The control method for a compressor according to claim 1 or 2, characterized in that, Based on the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, controlling the compressor to increase its frequency on the basis of the current operating frequency of the compressor includes: Based on the suction superheat degree of the compressor and the current operating frequency of the compressor, determining whether a frequency increase request for controlling the compressor to increase its frequency needs to be sent; If it is determined that a frequency increase request for controlling the compressor to increase its frequency needs to be sent, then sending a frequency increase request for controlling the compressor to increase its frequency, calculating the frequency increase rate of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, and controlling the compressor to increase its frequency on the basis of the current operating frequency of the compressor at the frequency increase rate of the compressor, so as to respond to the frequency increase request for controlling the compressor to increase its frequency; If it is determined that a frequency increase request for controlling the compressor to increase its frequency does not need to be sent, then adjusting the operating parameters of the unit where the compressor is located, and then returning to continue determining whether a frequency increase requirement for the compressor is received.

4. The control method for a compressor according to claim 3, characterized in that, Determining whether a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor according to the suction superheat of the compressor and the current operating frequency of the compressor, includes: Determining whether the suction superheat of the compressor is greater than or equal to a set value, and determining whether the current operating frequency of the compressor reaches the upper limit of the allowable frequency range of the compressor; If it is determined that the suction superheat of the compressor is greater than or equal to the set value, and it is determined that the current operating frequency of the compressor does not reach the upper limit of the allowable frequency range of the compressor, then it is determined that a frequency increase request for controlling the compressor to increase its frequency needs to be sent to the compressor; If it is determined that the suction superheat of the compressor is less than the set value, and / or it is determined that the current operating frequency of the compressor has reached the upper limit of the allowable frequency range of the compressor, then it is determined that a frequency increase request for controlling the compressor to increase its frequency does not need to be sent to the compressor.

5. The control method of the compressor according to claim 3 or 4, characterized in that, Calculating the frequency increase rate of the compressor according to the suction superheat of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, includes: Determining a first ratio of the discharge pressure of the compressor to the suction pressure of the compressor, and determining the result of multiplying the first ratio by the suction superheat of the compressor, and then determining a second ratio of the product to the current operating frequency of the compressor as the frequency increase rate of the compressor.

6. A control device for a compressor, characterized in that, comprises: A control unit configured to determine whether a frequency increase demand of the compressor is received during the operation of the compressor; An acquisition unit configured to, when it is determined that the frequency increase demand of the compressor has been received, acquire the suction superheat of the compressor, acquire the suction pressure of the compressor, acquire the discharge pressure of the compressor, and acquire the current operating frequency of the compressor; The control unit is further configured to control the compressor to increase its frequency based on the current operating frequency of the compressor according to the suction superheat of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor; by calculating the frequency increase rate of the variable-frequency compressor according to the suction superheat of the variable-frequency compressor, the discharge pressure of the variable-frequency compressor, the suction pressure of the variable-frequency compressor, and the current operating frequency of the variable-frequency compressor, and controlling the variable-frequency compressor to increase its frequency at the calculated frequency increase rate, so as to optimize the frequency control logic of the variable-frequency compressor.

7. The control device for a compressor according to claim 6, characterized in that, The control unit determines whether a frequency increase demand of the compressor is received, includes: Determining whether the current environmental parameters of the unit where the compressor is located do not reach the target environmental parameters, and / or determining whether a frequency increase instruction for increasing the frequency of the compressor sent by the user is received; If it is determined that the current environmental parameters of the unit where the compressor is located do not reach the target environmental parameters, and / or it is determined that an up-frequency command for increasing the frequency of the compressor sent by the user has been received, it is determined that the up-frequency requirement of the compressor has been received.

8. The control device of the compressor according to claim 6 or 7, wherein, the control unit controls the compressor to operate at an increased frequency based on the current operating frequency of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, including: determining whether to send an up-frequency request for controlling the up-frequency of the compressor according to the suction superheat degree of the compressor and the current operating frequency of the compressor; if it is determined that an up-frequency request for controlling the up-frequency of the compressor needs to be sent, sending an up-frequency request for controlling the up-frequency of the compressor, calculating the up-frequency rate of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, and controlling the compressor to increase the frequency at the up-frequency rate of the compressor based on the current operating frequency of the compressor to respond to the up-frequency request for controlling the up-frequency of the compressor; if it is determined that an up-frequency request for controlling the up-frequency of the compressor does not need to be sent, adjusting the operating parameters of the unit where the compressor is located, and then returning to continue to determine whether the up-frequency requirement of the compressor is received.

9. The control device of the compressor according to claim 8, wherein, the control unit determines whether to send an up-frequency request for controlling the up-frequency of the compressor according to the suction superheat degree of the compressor and the current operating frequency of the compressor, including: determining whether the suction superheat degree of the compressor is greater than or equal to a set value, and determining whether the current operating frequency of the compressor reaches the upper limit of the allowable frequency range of the compressor; if it is determined that the suction superheat degree of the compressor is greater than or equal to the set value, and it is determined that the current operating frequency of the compressor does not reach the upper limit of the allowable frequency range of the compressor, it is determined that an up-frequency request for controlling the up-frequency of the compressor needs to be sent; if it is determined that the suction superheat degree of the compressor is less than the set value, and / or it is determined that the current operating frequency of the compressor has reached the upper limit of the allowable frequency range of the compressor, it is determined that an up-frequency request for controlling the up-frequency of the compressor does not need to be sent.

10. The control device of the compressor according to claim 6 or 9, wherein, the control unit calculates the up-frequency rate of the compressor according to the suction superheat degree of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, and the current operating frequency of the compressor, including: Determine a first ratio of the exhaust pressure of the compressor to the suction pressure of the compressor, and determine the result of multiplying the first ratio by the suction superheat degree of the compressor, and then determine a second ratio of the result to the current operating frequency of the compressor as the frequency increase rate of the compressor.

11. A unit, Characterized in that, Comprising: The control device of the compressor according to any one of claims 6 to 10.

12. A storage medium, Characterized in that, The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the control method of the compressor according to any one of claims 1 to 5.

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