Heat pump unit control method and heat pump unit

Abstract

The invention discloses a heat pump unit control method and a heat pump unit, and the heat pump unit control method comprises the steps that based on the current operation power of the heat pump unit, whether the current operation power is within a preset power range or not is determined; after it is determined that the current operation power is not within the preset power range, the opening degree of a throttling valve is adjusted so as to adjust the amount of refrigerants entering a compressor from a flash evaporator, and the operation power of the heat pump unit is adjusted to be within the preset power range; therefore, when the heat pump unit is not in the high-energy-efficiency operation power range, the throttling valve can be adjusted according to the current operation power, the heat pump unit enters the high-energy-efficiency operation power range, and the energy efficiency performance of the heat pump unit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a control method for a heat pump unit and a heat pump unit. Background Art

[0002] Low-temperature air source heat pump air conditioners usually adopt jet-enhanced enthalpy compressors to improve the ultra-low temperature heating performance of the air conditioners. By supplementing gas at medium pressure, the circulation volume of the compressor is increased, thereby improving the heating capacity. In a jet-enhanced enthalpy unit, the gas supplement amount directly affects the refrigerant circulation volume and the capacity and energy efficiency of the unit.

[0003] However, for a jet-enhanced enthalpy system with a combination of a capillary tube and an expansion valve, when the environmental parameters are adjusted, it is easy to cause the gas supplement amount to deviate from the predetermined range, and the refrigerant circulation in the compressor will be affected, resulting in poor energy efficiency and reduced heating capacity of the heat pump air conditioner. Summary of the Invention

[0004] The main objective of the embodiments of the present invention is to provide a control method for a heat pump unit and a heat pump unit, aiming to improve the technical problem that the energy efficiency of the heat pump unit deteriorates due to the adjustment of environmental parameters in the prior art.

[0005] The embodiments of the present invention provide a control method for a heat pump unit. The heat pump unit includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a flash evaporator connected between the indoor heat exchanger and the outdoor heat exchanger. The flash evaporator is connected to the gas supplement port of the compressor for delivering refrigerant to the compressor; a throttle valve is connected between the indoor heat exchanger and the flash evaporator, and the throttle valve is used to control the amount of refrigerant entering the flash evaporator. The control method for the heat pump unit is characterized in that it includes:

[0006] Based on the current operating power of the heat pump unit, determine whether the current operating power is within a preset power range;

[0007] After determining that the current operating power is not within the preset power range, adjust the opening degree of the throttle valve to adjust the amount of refrigerant entering the compressor from the flash evaporator, so that the operating power of the heat pump unit is adjusted to the preset power range.

[0008] In some embodiments of the present invention, the determining whether the current operating power is within a preset power range based on the current operating power of the heat pump unit includes:

[0009] According to the current operating power, determine whether the corresponding gas supplement amount is within a preset gas supplement amount range;

[0010] If the gas supplement amount is within the preset gas supplement amount range, determine that the current operating power is within the preset power range;

[0011] If the air supplement amount is not within the preset air supplement amount range, it is determined that the current operating power is not within the preset power range.

[0012] In some embodiments of the present invention, determining whether the corresponding air supplement amount is within the preset air supplement amount range according to the current operating power includes:

[0013] Determine the opening degree of the throttle valve and the exhaust temperature of the compressor corresponding to the current operating power;

[0014] Determine whether the opening degree of the throttle valve and the exhaust temperature conform to the corresponding relationship;

[0015] If the opening degree of the throttle valve and the exhaust temperature conform to the corresponding relationship, it is determined that the air supplement amount is within the preset air supplement amount range;

[0016] If the opening degree of the throttle valve and the exhaust temperature do not conform to the corresponding relationship, it is determined that the air supplement amount is not within the preset air supplement amount range.

[0017] In some embodiments of the present invention, adjusting the opening degree of the throttle valve to adjust the refrigerant amount entering the compressor from the flash evaporator so that the operating power of the heat pump unit is adjusted to the preset power range includes:

[0018] When it is determined that the current operating power is less than the preset power range, control the throttle valve to increase the opening degree of the throttle valve at the first valve adjustment speed, so that the refrigerant amount entering the compressor from the flash evaporator increases, so as to increase the operating power of the compressor.

[0019] In some embodiments of the present invention, adjusting the opening degree of the throttle valve to adjust the refrigerant amount entering the compressor from the flash evaporator so that the operating power of the heat pump unit is adjusted to the preset power range further includes:

[0020] When it is determined that the current operating power is greater than the preset power range, control the throttle valve to decrease the opening degree of the throttle valve at the second valve adjustment speed, so that the refrigerant amount entering the compressor from the flash evaporator decreases, so as to reduce the operating power of the compressor.

[0021] In some embodiments of the present invention, the present invention further provides a heat pump unit, including a control module, a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a flash evaporator connected between the indoor heat exchanger and the outdoor heat exchanger. The flash evaporator is connected to the air supplement port of the compressor for delivering refrigerant to the compressor; a throttle valve is connected between the indoor heat exchanger and the flash evaporator, and the throttle valve is used to control the refrigerant amount entering the flash evaporator; the control module is electrically connected to the throttle valve;

[0022] The control module determines whether the current operating power of the heat pump unit is within a preset power range based on the current operating power of the heat pump unit;

[0023] After determining that the current operating power is not within the preset power range, the control module adjusts the opening degree of the throttle valve to regulate the amount of refrigerant flowing from the flash evaporator into the compressor, so as to adjust the operating power of the heat pump unit to the preset power range.

[0024] In some embodiments of the present invention, the control module is further configured to determine whether the gas replenishment amount is within a preset gas replenishment range;

[0025] If the gas replenishment amount is within the preset gas replenishment range, it is determined that the current operating power is within the preset power range;

[0026] If the gas replenishment amount is not within the preset gas replenishment range, it is determined that the current operating power is not within the preset power range.

[0027] In some embodiments of the present invention, the heat pump unit further includes a temperature sensor disposed on the exhaust pipeline of the compressor for obtaining the exhaust temperature of the compressor;

[0028] The control module is further configured to determine the opening degree of the throttle valve corresponding to the current operating power and the exhaust temperature of the compressor, and to determine whether the opening degree of the throttle valve and the exhaust temperature of the compressor conform to a corresponding relationship;

[0029] If the opening degree of the throttle valve and the exhaust temperature conform to the corresponding relationship, it is determined that the gas replenishment amount is within the preset gas replenishment range;

[0030] If the opening degree of the throttle valve and the exhaust temperature do not conform to the corresponding relationship, it is determined that the gas replenishment amount is not within the preset gas replenishment range.

[0031] In some embodiments of the present invention, when the control module determines that the current operating power is less than the preset power range, it controls the throttle valve to increase the opening degree of the throttle valve at a first valve adjustment speed, so that the amount of refrigerant flowing from the flash evaporator into the compressor increases, thereby increasing the operating power of the compressor.

[0032] In some embodiments of the present invention, when the control module determines that the current operating power is greater than the preset power range, it controls the throttle valve to decrease the opening degree of the throttle valve at a second valve adjustment speed, so that the amount of refrigerant flowing from the flash evaporator into the compressor decreases, thereby reducing the operating power of the compressor.

[0033] Embodiments of the present invention provide a heat pump unit control method and a heat pump unit. The heat pump unit control method is used to determine whether the heat pump unit is operating within an energy-efficient operating power range based on the current operating power of the heat pump unit. When the heat pump unit is not operating within the energy-efficient operating power range, the throttle valve is adjusted according to the current operating power to enable the heat pump unit to enter the energy-efficient operating power range and improve the energy efficiency performance of the heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0035] Figure 1 It is a schematic diagram of the steps of a heat pump unit control method according to an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of the steps of a heat pump unit control method according to a second embodiment of the present invention;

[0037] Figure 3 It is a schematic diagram of the steps of a heat pump unit control method according to a third embodiment of the present invention;

[0038] Figure 4 It is a schematic diagram of the structure of a heat pump unit according to an embodiment of the present invention;

[0039] Figure 5 It is a schematic diagram of the structure of a heat pump unit according to another embodiment of the present invention.

[0040] Reference numerals: 10, control module; 20, flow sensor; 30, temperature sensor; 100, compressor; 200, indoor heat exchanger; 300, outdoor heat exchanger; 400, flash tank; 510, throttle valve; 520, throttle capillary; 600, four-way valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0043] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0045] As Figures 1-5 shown, the present invention provides a heat pump unit, which includes a compressor 100, an indoor heat exchanger 200, an outdoor heat exchanger 300, and a flash evaporator 400 connected between the indoor heat exchanger 200 and the outdoor heat exchanger 300. The flash evaporator 400 is connected to the gas supplement port of the compressor 100 and is used to deliver refrigerant to the compressor 100; a throttle valve 510 is connected between the indoor heat exchanger 200 and the flash evaporator 400, and the throttle valve 510 is used to control the amount of refrigerant entering the flash evaporator 400. The characteristic lies in that the control method of the heat pump unit includes:

[0046] S300, based on the current operating power of the heat pump unit, determine whether the current operating power is within a preset power range.

[0047] Among them, the preset power range is generally a set of power data ranges that are set in advance and stored in the controller of the heat pump unit according to the best operating performance of the heat pump unit and the actual usage requirements. For example, the preset power range is (P1, P2), where P1 is the first preset power and P2 is the second preset power, and the first preset power is less than the second preset power.

[0048] In some embodiments, a power monitoring sensor, such as a current detection device, may be provided on the heat pump unit to detect the operating current of the current compressor. According to the operating current of the compressor and the operating voltage of the heat pump unit, the current operating power of the compressor 100 can be calculated and obtained, and it can be determined whether it is within the preset power range based on the current operating power of the compressor 100.

[0049] S500, after determining that the current operating power is not within the preset power range, adjust the opening degree of the throttle valve 510 to adjust the amount of refrigerant flowing from the flash evaporator 400 into the compressor 100, so that the operating power of the heat pump unit is adjusted to the preset power range.

[0050] Among them, the current operating power of the compressor 100 being less than or equal to the first preset power or greater than or equal to the second preset power both belong to not being within the preset power range.

[0051] Among them, adjusting the opening degree of the throttle valve 510 generally means increasing or decreasing the opening degree of the throttle valve 510. That is, by increasing or decreasing the opening degree of the throttle valve 510, the amount of refrigerant flowing from the flash evaporator 400 into the compressor 100 is increased or decreased, the refrigerant circulation amount of the compressor 100 is increased or decreased, and further the operating current of the compressor 100 is increased or decreased to increase or decrease the operating power of the heat pump unit, so that the operating power of the heat pump unit enters the preset power range.

[0052] It can be understood that the heat pump unit control method is used to determine whether the heat pump unit is within the high-efficiency operating power range according to the current operating power of the heat pump unit, and when the heat pump unit is not within the high-efficiency operating power range, the throttle valve 510 is adjusted according to the current operating power to make the heat pump unit enter the high-efficiency operating power range and improve the energy efficiency performance of the heat pump unit.

[0053] In some embodiments, S300, based on the current operating power of the heat pump unit, determining whether the current operating power is within the preset power range includes:

[0054] S310, according to the current operating power, determining whether the corresponding gas replenishment amount is within the preset gas replenishment amount range.

[0055] Among them, when the heat pump unit is operating at the current operating power, the gas replenishment amount of its compressor 100 also corresponds to the current operating power. That is, by determining whether the gas replenishment amount of the compressor 100 is within the preset gas replenishment amount range, it can be determined whether the current operating power is within the preset power range.

[0056] Among them, the preset gas replenishment amount range can be understood as the preset gas replenishment amount range of the gas replenishment amount of the compressor 100 when the heat pump unit is operating at the current operating power.

[0057] That is, the gas replenishment amount is closely related to the operating power of the heat pump unit. When the gas replenishment amount of the compressor 100 is within the preset gas replenishment amount range, the current operating power of the heat pump unit is also within the preset power range. That is, at this time, the power of the heat pump unit is the high-efficiency power.

[0058] S321, if the gas replenishment amount is within the preset gas replenishment amount range, it is determined that the current operating power is within the preset power range.

[0059] S322, if the gas replenishment amount is not within the preset gas replenishment amount range, it is determined that the current operating power is not within the preset power range.

[0060] It can be understood that by determining the situation of the gas replenishment amount, it is possible to determine whether the current operating power is within the preset power range when the heat pump unit is not equipped with a power monitoring device.

[0061] In some embodiments, the corresponding gas replenishment amount can be obtained by setting a flow sensor 20 at the gas replenishment port of the compressor 100. At this time, it can be determined whether the gas replenishment amount at the current operating power is within the preset gas replenishment amount range by using the preset gas replenishment amount range data in the controller of the heat pump unit to determine whether the gas replenishment amount is within the preset gas replenishment amount range. Referring to the judgment of whether the current operating power is normal in the foregoing embodiments, the preset gas replenishment amount range data is (L1, L2), where L1 is the first gas replenishment amount and L2 is the second gas replenishment amount. When the gas replenishment amount is less than or equal to L1, or the gas replenishment amount is greater than or equal to L2, it is determined that the gas replenishment amount is not within the preset gas replenishment amount range.

[0062] In some embodiments, if the flow sensor 20 is not set at the gas replenishment port of the compressor 100, it is also possible to determine whether the gas replenishment amount is within the preset gas replenishment amount range by the opening degree of the throttle valve 510 and the exhaust temperature of the compressor 100.

[0063] In some embodiments, S310, according to the current operating power, determining whether the corresponding gas replenishment amount is within the preset gas replenishment amount range includes:

[0064] S311, determining the opening degree of the throttle valve 510 and the exhaust temperature of the compressor 100 corresponding to the current operating power.

[0065] Among them, at the current operating power, the opening degree of the throttle valve 510 can be determined by the controller in the heat pump unit, and the exhaust temperature can be obtained through the temperature sensor 30 arranged on the pipeline of the exhaust section of the compressor 100. That is, the opening degree of the throttle valve 510 and the exhaust temperature of the heat pump unit operating at the current operating power are the opening degree of the throttle valve 510 and the exhaust temperature corresponding to the current operating power.

[0066] S312. Determine whether the opening degree of the throttle valve 510 and the exhaust temperature conform to the corresponding relationship.

[0067] Among them, the opening degree of the throttle valve 510 can affect the amount of refrigerant flowing from the flash evaporator 400 into the compressor 100, and thus affect the exhaust temperature of the compressor 100. Therefore, generally each opening degree of the throttle valve 510 has a corresponding exhaust temperature. Generally, it can be determined through experiments or simulation software, and the opening degree data of the throttle valve 510 when the supplementary gas amount is within the preset supplementary gas amount range and the corresponding exhaust temperature data are pre-stored in the controller of the heat pump unit. After determining the opening degree of the throttle valve 510, the corresponding standard exhaust temperature can be found in the controller, and the corresponding standard exhaust temperature is compared with the actual exhaust temperature. If the actual exhaust temperature is consistent with the standard exhaust temperature, it is determined that the opening degree of the throttle valve 510 and the exhaust temperature conform to the corresponding relationship. If the actual exhaust temperature is inconsistent with the standard exhaust temperature, it is determined that the opening degree of the throttle valve 510 and the exhaust temperature do not conform to the corresponding relationship.

[0068] S313. If the opening degree of the throttle valve 510 and the exhaust temperature conform to the corresponding relationship, it is determined that the supplementary gas amount is within the preset supplementary gas amount range.

[0069] S314. If the opening degree of the throttle valve 510 and the exhaust temperature do not conform to the corresponding relationship, it is determined that the supplementary gas amount is not within the preset supplementary gas amount range.

[0070] It can be understood that based on the standard exhaust temperature corresponding to the opening degree of the throttle valve 510 when the supplementary gas amount is within the preset supplementary gas amount range, it is determined whether the current actual exhaust temperature is consistent with the exhaust temperature, so as to be able to determine whether the supplementary gas amount is within the preset supplementary gas amount range. Furthermore, in the case where the flow sensor 20 is not provided at the supplementary gas port, it can be determined whether the current operating power of the heat pump unit is within the preset range.

[0071] In some embodiments, if the difference between the actual exhaust temperature and the standard exhaust temperature is greater than the set difference, it is determined that the actual exhaust temperature is inconsistent with the standard exhaust temperature. If the difference between the actual exhaust temperature and the standard exhaust temperature is less than or equal to the set difference, it is determined that the actual exhaust temperature is consistent with the standard exhaust temperature.

[0072] In some embodiments, in S500, adjusting the opening degree of the throttle valve 510 to regulate the amount of refrigerant flowing from the flash evaporator 400 into the compressor 100, so that the operating power of the heat pump unit is adjusted to a preset power range, includes:

[0073] S510, when it is determined that the current operating power is less than the preset power range, controlling the throttle valve 510 to increase the opening degree of the throttle valve 510 at a first valve adjustment speed, so that the amount of refrigerant flowing from the flash evaporator 400 into the compressor 100 increases, thereby increasing the operating power of the compressor 100.

[0074] Wherein, if the preset power range is (P1, P2), P1 is the first preset power, P2 is the second preset power, and the first preset power is less than the second preset power; when the current operating power is less than or equal to the first preset power, it is determined that the current operating power is less than the preset power range.

[0075] Wherein, the first valve adjustment speed is the adjustment speed pre-stored in the heat pump unit, generally 5 steps / 30 s, that is, adjusted 5 steps every thirty seconds.

[0076] It can be understood that as the opening degree of the throttle valve 510 increases, the amount of refrigerant flowing from the flash evaporator 400 into the compressor 100 increases, the current of the compressor 100 thus increases, and the operating power of the heat pump unit also increases accordingly, making the operating power of the heat pump unit gradually approach the preset power range and finally fall within the preset power range.

[0077] In some embodiments, in S500, adjusting the opening degree of the throttle valve 510 to regulate the amount of refrigerant flowing from the flash evaporator 400 into the compressor 100, so that the operating power of the heat pump unit is adjusted to a preset power range, includes:

[0078] S520, when it is determined that the current operating power is greater than the preset power range, controlling the throttle valve 510 to decrease the opening degree of the throttle valve 510 at a second valve adjustment speed, so that the amount of refrigerant flowing from the flash evaporator 400 into the compressor 100 decreases, thereby reducing the operating power of the compressor 100.

[0079] Wherein, if the preset power range is (P1, P2), P1 is the first preset power, P2 is the second preset power, and the first preset power is less than the second preset power; when the current operating power is greater than or equal to the first preset power, it is determined that the current operating power is greater than the preset power range.

[0080] Wherein, the second valve adjustment speed is the adjustment speed pre-stored in the heat pump unit, generally 5 steps / 30 s, that is, adjusted 5 steps every thirty seconds.

[0081] It can be understood that as the opening degree of the throttle valve 510 decreases, the amount of refrigerant entering the compressor 100 in the flash evaporator 400 decreases, the current of the compressor 100 decreases accordingly, and the operating power of the heat pump unit also decreases, causing the operating power of the heat pump unit to gradually approach the preset power range and finally fall within the preset power range.

[0082] In some embodiments, the adjustment speed of the first valve is greater than that of the second valve. For example, the adjustment speed of the first valve is 5 steps / 30s, and the adjustment speed of the second valve is 4 steps / 30s.

[0083] In some embodiments, the adjustment speed of the first valve is less than that of the second valve. For example, the adjustment speed of the first valve is 5 steps / 30s, and the adjustment speed of the second valve is 6 steps / 30s.

[0084] In some other embodiments, in S500, the opening degree of the throttle valve 510 is adjusted to regulate the amount of refrigerant entering the compressor 100 from the flash evaporator 400, so that the operating power of the heat pump unit is adjusted to the preset power range, including:

[0085] S511, after determining that the current operating power is less than the preset power range, determine the first difference between the current operating power and the minimum power in the preset power range.

[0086] For example, when the preset power range is (P1, P2), P1 is the first preset power, P2 is the second preset power, and the first preset power is less than the second preset power. After determining that the current operating power P is less than or equal to P1, it is determined that the current operating power is less than the preset power range, and then the first difference H1 between P1 and P is determined, that is, H1 = P1 - P.

[0087] S512, determine the adjustment speed of the throttle valve 510 according to the first difference.

[0088] Generally, when the first difference is too large, the adjustment speed of the throttle valve 510 should be relatively large so that the operating power of the heat pump unit can quickly recover to the preset power range; when the first difference is relatively small, the adjustment speed of the throttle valve 510 should be relatively small to avoid excessive adjustment causing the operating power to exceed the preset power range.

[0089] S513, if the first difference is greater than the preset difference, determine the adjustment speed of the throttle valve 510 as the third valve adjustment speed;

[0090] S514, if the first difference is less than or equal to the preset difference, determine the adjustment speed of the throttle valve 510 as the fourth valve adjustment speed, where the third valve adjustment speed is greater than the fourth valve adjustment speed.

[0091] In some embodiments, in S500, the opening degree of the throttle valve 510 is adjusted to regulate the amount of refrigerant entering the compressor 100 from the flash evaporator 400, so that the operating power of the heat pump unit is adjusted to a preset power range, including:

[0092] S511, after determining that the current operating power is greater than the preset power range, determine the second difference between the current operating power and the maximum power in the preset power range.

[0093] For example, when the preset power range is (P1, P2), P1 is the first preset power, P2 is the second preset power, and the first preset power is less than the second preset power. After determining that the current operating power P is greater than or equal to P2, it is determined that the current operating power is greater than the preset power range, and then the second difference H2 between P and P2 is determined, that is, H2 = P - P2.

[0094] S512, determine the adjustment speed of the throttle valve 510 according to the second difference.

[0095] Generally, when the second difference is too large, the adjustment speed of the throttle valve 510 should be relatively large, so that the operating power of the heat pump unit can quickly return to the preset power range; when the second difference is small, the adjustment speed of the throttle valve 510 should be relatively small to avoid excessive adjustment causing the operating power to exceed the preset power range.

[0096] S513, if the second difference is greater than the preset difference, determine the adjustment speed of the throttle valve 510 as the third valve adjustment speed;

[0097] S514, if the second difference is less than or equal to the preset difference, determine the adjustment speed of the throttle valve 510 as the fourth valve adjustment speed, where the third valve adjustment speed is greater than the fourth valve adjustment speed.

[0098] In some embodiments, the present invention further provides a heat pump unit, which includes a control module 10, a compressor 100, an indoor heat exchanger 200, an outdoor heat exchanger 300, and a flash evaporator 400 connected between the indoor heat exchanger 200 and the outdoor heat exchanger 300. The flash evaporator 400 is connected to the gas supplement port of the compressor 100 and is used to supply refrigerant to the compressor 100. A throttle valve 510 is connected between the indoor heat exchanger 200 and the flash evaporator 400, and the throttle valve 510 is used to control the amount of refrigerant entering the flash evaporator 400; the control module 10 is electrically connected to the throttle valve 510. The control module 10 determines whether the current operating power is within the preset power range based on the current operating power of the heat pump unit.

[0099] After the control module 10 determines that the current operating power is not within the preset power range, it adjusts the opening degree of the throttle valve 510 to regulate the amount of refrigerant entering the compressor 100 from the flash evaporator 400, so that the operating power of the heat pump unit is adjusted to the preset power range.

[0100] Among them, the throttle valve 510 is an expansion valve.

[0101] Among them, the control module 10 is electrically connected to the compressor 100; the throttle valve 510 is used to receive the electrical signal of the control module 10 to adjust the opening degree.

[0102] It can be understood that the control module 10 adjusting the opening degree of the throttle valve 510 can adjust the amount of refrigerant flowing into the flash evaporator 400 from the indoor heat exchanger 200, and further can adjust the amount of refrigerant flowing into the compressor 100 from the flash evaporator 400. The current of the compressor 100 increases as the amount of refrigerant increases and decreases as the amount of refrigerant decreases. Furthermore, the operating power of the compressor 100 is adjusted. Therefore, the control module 10 can adjust the operating power of the heat pump unit by adjusting the opening degree of the throttle valve 510, so that the operating power of the heat pump unit is within the preset power range to ensure that the heat pump unit has a high energy efficiency performance.

[0103] Among them, the heat pump unit further includes a four-way valve 600. The four-way valve 600 has four valve ports C, D, E, and S. The intake port of the compressor 100 is connected to the S valve port, the exhaust port of the compressor 100 is connected to the D valve port, the C valve port is connected to the outdoor heat exchanger 300, and the E valve port is connected to the indoor heat exchanger 200. The four-way valve 600 is electrically connected to the control module 10, and the control module 10 can send a control signal to the four-way valve to switch the refrigerant circulation flow direction of the heat pump unit.

[0104] In some embodiments, a throttle capillary 520 is connected between the flash evaporator 400 and the outdoor heat exchanger 300.

[0105] In some embodiments, the control module 10 is further configured to determine whether the corresponding gas replenishment amount is within the preset gas replenishment amount range according to the current operating power.

[0106] If the gas replenishment amount is within the preset gas replenishment amount range, it is determined that the current operating power is within the preset power range. That is, when the control module 10 determines that the gas replenishment amount is within the preset gas replenishment amount range, it can be determined that the current operating power is within the preset power range.

[0107] If the gas replenishment amount is not within the preset gas replenishment amount range, it is determined that the current operating power is not within the preset power range. That is, when the control module 10 determines that the gas replenishment amount is not within the preset gas replenishment amount range, it can be determined that the current operating power is not within the preset power range.

[0108] In some other embodiments, a flow sensor 20 is provided at the gas replenishing port of the compressor 100, and thus the corresponding gas replenishing amount can be obtained through the flow sensor 20. At this time, the preset gas replenishing amount range data preset in the control module 10 of the heat pump unit can be used to determine whether the gas replenishing amount at the current operating power is within the preset gas replenishing amount range to judge whether the current operating power is within the preset power range; the flow sensor 20 is electrically connected to the control module 10 so that the flow sensor 20 can feedback the gas replenishing amount to the control module 10.

[0109] In some embodiments, the heat pump unit further includes a temperature sensor 30. The temperature sensor 30 is disposed on the exhaust pipeline section of the compressor 100 and is used to obtain the exhaust temperature of the compressor 100. The control module 10 is further used to determine the opening degree of the throttle valve 510 corresponding to the current operating power and the exhaust temperature of the compressor 100, and is used to determine whether the opening degree of the throttle valve 510 and the exhaust temperature of the compressor 100 conform to the corresponding relationship.

[0110] If the opening degree of the throttle valve 510 and the exhaust temperature conform to the corresponding relationship, it is determined that the gas replenishing amount is within the preset gas replenishing amount range.

[0111] If the opening degree of the throttle valve 510 and the exhaust temperature do not conform to the corresponding relationship, it is determined that the gas replenishing amount is not within the preset gas replenishing amount range.

[0112] That is, the control module 10 can determine whether the gas replenishing amount is within the preset gas replenishing amount according to the relationship between the opening degree of the throttle valve 510 and the exhaust temperature.

[0113] Wherein, the temperature sensor 30 is electrically connected to the control module 10 to feedback the exhaust temperature to the control module 10, so that the control module 10 can determine whether the gas replenishing amount is within the preset gas replenishing amount range according to the opening degree of the throttle valve 510 and the exhaust temperature.

[0114] It can be understood that by comparing the opening degree of the throttle valve 510 and the exhaust temperature through the control module 10, it is possible to determine whether the gas replenishing amount is normal when the flow sensor 20 is not provided at the gas replenishing port.

[0115] In some embodiments, the control module 10 is further used to control the throttle valve 510 to increase the opening degree of the throttle valve 510 at the first valve adjustment speed when it is determined that the current operating power is less than the preset power range, so that the amount of refrigerant entering the compressor 100 from the flash evaporator 400 increases, thereby increasing the operating power of the compressor 100.

[0116] In some embodiments, the control module 10 is further used to control the throttle valve 510 to decrease the opening degree of the throttle valve 510 at the second valve adjustment speed when it is determined that the current operating power is greater than the preset power range, so that the amount of refrigerant entering the compressor 100 from the flash evaporator 400 decreases, thereby reducing the operating power of the compressor 100.

[0117] For the specific implementation of each of the above operations, reference may be made to the previous embodiments and will not be elaborated herein.

[0118] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not elaborated in a certain embodiment, reference may be made to the detailed descriptions of other embodiments above and will not be elaborated herein.

[0119] The above are only alternative embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the application concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A control method for a heat pump unit, the heat pump unit comprising a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a flash evaporator connected between the indoor heat exchanger and the outdoor heat exchanger, the flash evaporator being connected to an air supply port of the compressor for conveying refrigerant to the compressor; a throttle valve being connected between the indoor heat exchanger and the flash evaporator, the throttle valve being used to control the amount of refrigerant entering the flash evaporator, characterized in that: The heat pump unit control method comprises: Based on the current operating power of the heat pump unit, determining whether the current operating power is within a preset power range; After determining that the current operating power is not within the preset power range, the opening of the throttle valve is adjusted to regulate the amount of refrigerant entering the compressor from the flash evaporator, so that the operating power of the heat pump unit is adjusted to the preset power range.

2. The heat pump unit control method according to claim 1, characterized in that: The determining, based on the current operating power of the heat pump unit, whether the current operating power is within the preset power range includes: According to the current operating power, determining whether the corresponding air supply volume is within a preset air supply volume range; If the air supply volume is within the preset air supply volume range, determining that the current operating power is within the preset power range; If the air supplement amount is not within the preset air supplement amount range, it is determined that the current operating power is not within the preset power range.

3. The heat pump unit control method according to claim 2, characterized in that: The step of determining, based on the current operating power, whether the corresponding air supply volume is within the preset air supply volume range includes: determining the opening of the throttle valve and the exhaust temperature of the compressor corresponding to the current operating power; Determining whether the opening of the throttle valve and the exhaust temperature are in a corresponding relationship; If the opening of the throttle valve and the exhaust temperature are in a corresponding relationship, it is determined that the air supplement amount is within the preset air supplement amount range; If the opening of the throttle valve does not conform to the corresponding relationship with the exhaust temperature, it is determined that the supplementary air amount is not within the preset supplementary air amount range.

4. The heat pump unit control method according to claim 1, characterized in that: The adjusting the opening of the throttle valve to adjust the amount of refrigerant entering the compressor from the flash evaporator so that the operating power of the heat pump unit is adjusted to the preset power range includes: When it is determined that the current operating power is less than the preset power range, the throttle valve is controlled to increase the opening of the throttle valve at a first valve adjustment speed, so that the amount of refrigerant entering the compressor from the flash evaporator is increased to increase the operating power of the compressor.

5. The heat pump unit control method according to claim 1 or 4, characterized in that: The step of adjusting the opening of the throttle valve to adjust the amount of refrigerant entering the compressor from the flash evaporator so that the operating power of the heat pump unit is adjusted to the preset power range further includes: When it is determined that the current operating power is greater than the preset power range, the throttle valve is controlled to reduce the opening of the throttle valve according to the second valve adjustment speed, so that the amount of refrigerant entering the compressor from the flash evaporator is reduced to reduce the operating power of the compressor.

6. A heat pump unit, comprising a control module, a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a flash evaporator connected between the indoor heat exchanger and the outdoor heat exchanger, wherein the flash evaporator is connected to the air supply port of the compressor and is used to deliver refrigerant to the compressor; a throttle valve is connected between the indoor heat exchanger and the flash evaporator, and the throttle valve is used to control the amount of refrigerant entering the flash evaporator; the control module is electrically connected to the throttle valve, and is characterized in that: The control module determines whether the current operating power of the heat pump unit is within a preset power range based on the current operating power of the heat pump unit; After determining that the current operating power is not within the preset power range, the control module adjusts the opening of the throttle valve to regulate the amount of refrigerant from the flash evaporator entering the compressor, so that the operating power of the heat pump unit is adjusted to the preset power range.

7. The heat pump unit according to claim 6, characterized in that: The control module is also used to determine whether the corresponding air supply volume is within a preset air supply volume range according to the current operating power; If the air supply volume is within the preset air supply volume range, determining that the current operating power is within the preset power range; If the air supplement amount is not within the preset air supplement amount range, it is determined that the current operating power is not within the preset power range.

8. The heat pump unit according to claim 7, characterized in that: The heat pump unit further includes a temperature sensor, which is arranged in the exhaust pipe of the compressor and is used to obtain the exhaust temperature of the compressor; The control module is further used to determine the opening of the throttle valve and the exhaust temperature of the compressor corresponding to the current operating power, and to determine whether the opening of the throttle valve and the exhaust temperature of the compressor conform to a corresponding relationship; If the opening of the throttle valve and the exhaust temperature are in a corresponding relationship, it is determined that the air supply amount is within the preset air supply amount range; If the opening of the throttle valve does not conform to the corresponding relationship with the exhaust temperature, it is determined that the supplementary air amount is not within the preset supplementary air amount range.

9. The heat pump unit according to claim 6, characterized in that: The control module is also used to control the throttle valve to increase the opening of the throttle valve at a first valve adjustment speed when it is determined that the current operating power is less than the preset power range, so as to increase the amount of refrigerant entering the compressor from the flash evaporator to increase the operating power of the compressor.

10. The heat pump unit according to claim 6 or 9, characterized in that: The control module is also used to control the throttle valve to reduce the opening of the throttle valve according to the second valve adjustment speed when it is determined that the current operating power is greater than the preset power range, so as to reduce the amount of refrigerant entering the compressor from the flash evaporator to reduce the operating power of the compressor.

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