Four-way valve, control method of four-way valve and air conditioner

Abstract

The invention relates to the technical field of air conditioners, in particular to a four-way valve, a control method of the four-way valve and an air conditioner, the four-way valve comprises a valve body and a detection component, the valve body comprises a valve body, a sliding block, a first baffle and a second baffle, the valve body is provided with an air outlet pipe and a cavity communicating with the air outlet pipe, and the two ends of the cavity are provided with a first end cover and a second end cover correspondingly; the first baffle, the sliding block and the second baffle are sequentially connected in the direction from the first end cover to the second end cover and arranged in the cavity, the sliding block is communicated with the air outlet pipe, and the detection component is arranged in the cavity and suitable for detecting at least one of the vertical distance between the first baffle and the first end cover and the vertical distance between the second baffle and the second end cover. And the first compressor and the second compressor can operate independently, so that the operation reliability of the heat pump unit is further improved. And the reversing result of the four-way valve is judged to be more accurate and quicker by detecting the distance between the baffle and the end cover.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a four-way valve, a control method of the four-way valve, and an air conditioner. Background Art

[0002] As a refrigeration and heating switching component of an air conditioner, the switching between the refrigeration and heating modes is achieved by energizing the four-way valve coil, which causes the position of the internal armature to change and the internal flow path to change, so that the gas discharged from the compressor first enters the outdoor heat exchanger and is changed to first enter the indoor heat exchanger. In the heating mode, only when a certain pressure difference (the difference between the high pressure and the low pressure) reaches a value that can enable the four-way valve to overcome the friction force of the internal slider can the mode be switched to the heating mode. If the multi-connected unit is used for a long time, the four-way valve component ages, or impurities enter during system welding and block the friction part of the four-way valve sliding device, which will affect the commutation.

[0003] If the four-way valve commutation fails during the heating startup stage in winter, it will cause the system to be controlled in the heating mode, but actually operate in the refrigeration mode, and the system cannot recognize it. On the one hand, it seriously affects the user experience. On the other hand, when operating according to the heating mode control, the indoor unit acts as a condenser, and the electronic expansion valve of the indoor operating unit is basically controlled to be fully open. However, due to the actual operation in the refrigeration mode, it will cause the opening degree of the indoor unit electronic expansion valve to be too large, and a large amount of liquid refrigerant cannot evaporate, resulting in liquid slugging of the compressor after long-term operation, damaging the compressor and shortening the service life of the multi-connected unit.

[0004] Most of the existing technologies for detecting whether the four-way valve commutation is successful rely on temperature detection. However, regardless of whether the four-way valve commutation is successful or not, the temperature change is not the fastest, resulting in slow detection. Moreover, without the protection of the heat insulation cotton, the real-time temperature of the temperature sensor will be seriously affected, affecting the accuracy of the judgment. Summary of the Invention

[0005] The present invention provides a four-way valve, a control method of the four-way valve, and an air conditioner to solve one of the defects in the prior art. When the four-way valve commutes, the distance between the baffle and the end cover changes as the internal slider in the cavity of the valve body moves. The detection component can detect the distance change in time. Through the detection result of the detection component, it is possible to obtain in time whether the four-way valve commutation is successful. Compared with the traditional temperature detection, the present invention is more accurate and faster in judging the four-way valve commutation result by detecting the distance between the baffle and the end cover.

[0006] An embodiment of the present invention provides a four-way valve, which includes a valve body and a detection component. The valve body includes a valve main body, a slider, a first baffle, and a second baffle. The valve main body is provided with an air outlet pipe and a cavity communicated with the air outlet pipe. A first end cover and a second end cover are respectively arranged at two ends of the cavity. The first baffle, the slider, and the second baffle are sequentially connected and arranged inside the cavity along the direction from the first end cover to the second end cover. The slider is communicated with the air outlet pipe. The detection component is arranged inside the cavity and is adapted to detect at least one of the vertical distance between the first baffle and the first end cover and the vertical distance between the second baffle and the second end cover.

[0007] According to the four-way valve provided by the present invention, the detection component includes at least one of a first sensor and a second sensor. The first sensor is arranged on the first end cover or the first baffle, and the second sensor is arranged on the second end cover or the second baffle. When the first sensor is arranged on the first end cover and the second sensor is arranged on the second end cover, the positions of the end covers are fixed, the setting of the detection component is relatively stable, and the detection basis is also relatively stable.

[0008] The present invention also provides a control method for a four-way valve, which is applied to the four-way valve as described above. The four-way valve is adapted to be switched from a first position to a second position. The first position is one of a refrigeration position and a heating position, and the second position is the other of the refrigeration position and the heating position. In the first position, the vertical distance between the first baffle and the first end cover is less than or equal to a first set distance, and the vertical distance between the second baffle and the second end cover is greater than or equal to a second set distance. The method includes: Obtaining a commutation instruction and controlling the four-way valve to switch from the first position to the second position; Based on satisfying at least one of a first judgment condition and a second judgment condition, determining that the four-way valve has not been switched from the first position to the second position, and controlling the four-way valve to power off; Obtaining a re-commutation instruction and controlling the four-way valve to switch from the first position to the second position; The first judgment condition is that the vertical distance between the first baffle and the first end cover is less than or equal to the first set distance, and the second judgment condition is that the vertical distance between the second baffle and the second end cover is greater than or equal to the second set distance.

[0009] During the process of the four-way valve reversing for only a few seconds, in the prior art, the result of reversing is detected by temperature. The temperature change cannot correctly represent this instantaneous process. However, displacement is a physical quantity that can change instantaneously with the reversing process. Therefore, when the four-way valve is reversing, the distance between the baffle and the end cover will change as the slider inside the cavity of the valve body moves. The detection component can detect the distance change in time. Based on the detection result of the detection component, it can be obtained in time whether the four-way valve has successfully reversed. Compared with the traditional temperature detection, the present invention can judge the reversing result of the four-way valve more accurately and quickly by detecting the vertical distance between the baffle and the end cover.

[0010] According to a control method of a four-way valve provided by the present invention, the obtaining a re-reversing instruction and controlling the four-way valve to switch from the first position to the second position includes: Based on the completed number of re-reversings and the mapping relationship between the number of re-reversings and the set pressure difference, obtaining the set pressure difference for the current re-reversing; Based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing, controlling the four-way valve to be powered on for reversing.

[0011] By automatically controlling the four-way valve to re-reverse, the failure of the four-way valve to stop due to a single reversing failure can be avoided. If the re-reversing is successful, it can also avoid affecting the user experience and wasting the time and cost of after-sales service for on-site maintenance.

[0012] According to a control method of a four-way valve provided by the present invention, after controlling the four-way valve to be powered on for reversing based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing, it further includes: Based on satisfying at least one of the first judgment condition and the second judgment condition, determining that the four-way valve has not switched from the first position to the second position, controlling the four-way valve to be powered off, and recording the current number of re-reversings as the completed number of re-reversings; Returning to the step of obtaining the set pressure difference for the current re-reversing based on the completed number of re-reversings and the mapping relationship between the number of re-reversings and the set pressure difference.

[0013] During the process of automatically controlling the four-way valve to re-reverse, a reversing detection method for judging the reversing result of the four-way valve by detecting the vertical distance between the baffle and the end block is also added, further improving the accuracy of the four-way valve reversing control and the detection speed.

[0014] According to a control method of a four-way valve provided by the present invention, the controlling the four-way valve to be powered on for reversing based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing includes: When the completed number of re-reversings is 0, determining that the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-reversing, and controlling the four-way valve to be powered on for reversing.

[0015] During the process of the four-way valve re-reversing, judge the relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing. If the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-reversing, and the current re-reversing count is the first time, then directly control the four-way valve coil to be powered on for reversing.

[0016] According to a control method for a four-way valve provided by the present invention, the controlling the four-way valve to be powered on for reversing based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing further includes: Determine that the actual pressure difference of the four-way valve is less than the set pressure difference for the current re-reversing, increase the compressor frequency until the actual pressure difference of the four-way valve is equal to the set pressure difference for the current re-reversing, and control the four-way valve to be powered on for reversing.

[0017] When the actual pressure difference of the four-way valve is less than the set pressure difference for the current re-reversing, it is necessary to first increase the actual pressure difference by increasing the compressor frequency. After reaching the set pressure difference, then perform re-reversing, and then it can be confirmed whether the current set pressure difference can meet the reversing requirement, so as to ensure that the four-way valve is reversed under appropriate compressor operating frequency and pressure difference conditions.

[0018] According to a control method for a four-way valve provided by the present invention, the controlling the four-way valve to be powered on for reversing based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing further includes: Based on the fact that the number of completed re-reversings is greater than or equal to 1 time, determine that the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-reversing, decrease the compressor frequency until the actual pressure difference of the four-way valve is equal to the set pressure difference for the current re-reversing, and control the four-way valve to be powered on for reversing.

[0019] When the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-reversing, it is necessary to first decrease the actual pressure difference by decreasing the compressor frequency. After reaching the set pressure difference, then perform re-reversing, and then it can be confirmed whether the current set pressure difference can meet the reversing requirement, so as to ensure that the four-way valve is reversed under appropriate compressor operating frequency and pressure difference conditions.

[0020] According to a control method for a four-way valve provided by the present invention, after recording the number of current re-reversings as the number of completed re-reversings, it further includes: Determine that the number of completed re-reversings reaches the total number of re-reversings in the mapping relationship between the number of re-reversings and the set pressure difference, and control the compressor to stop.

[0021] According to the operating condition of the compressor, the preset total number of re-reversings is limited. If the number of re-reversings reaches the total number of re-reversings and still cannot reverse successfully, then report a fault and stop.

[0022] According to a control method of a four-way valve provided by the present invention, in the mapping relationship between the number of re-reversals and the set pressure difference, the set pressure difference is positively correlated with the number of re-reversals, and the set pressure differences are in an increasing relationship.

[0023] Effectively utilize each re-reversal to quickly achieve successful reversal of the four-way valve, improve the reversal efficiency, avoid wasting the control actions of re-reversal, and gradually increase the set pressure difference, which also avoids the damage to the compressor and the four-way valve caused by sudden pressure difference changes and system fluctuations.

[0024] According to a control method of a four-way valve provided by the present invention, before obtaining the re-reversal instruction and controlling the four-way valve to switch from the first position to the second position, it further includes: Turn off the outdoor unit fan; Control the opening degree of the electronic expansion valve of the indoor unit to be reduced to 1 / 5 of the maximum opening degree; Based on the fan speed being reduced to 0, obtain the actual pressure difference of the four-way valve.

[0025] The present invention also provides an air conditioner, including the four-way valve as described above or implementing the control method of the four-way valve as described above.

[0026] The four-way valve provided by the present invention, the valve body is mainly composed of a valve body, a slider, and a first baffle and a second baffle connected to the slider. A cavity is provided inside the valve body, and the air outlet pipe is communicated with the cavity of the valve body. The slider, the first baffle, and the second baffle are connected as a whole and arranged in the cavity. Both ends of the cavity are closed by a first end cover and a second end cover, so that a first cavity is formed between the first baffle and the first end cover in the valve body, and a second cavity is formed between the second baffle and the second end cover. By adjusting the air pressure in the first cavity and the second cavity, the volumes of the first cavity and the second cavity are changed, and then the structural cylinder parts of the first baffle, the slider, and the second baffle move. That is, under the pressure change on both sides of the first baffle and the second baffle, the slider can move in the cavity, and then the position where the slider is communicated with the air outlet pipe is changed, so as to realize the switching of the four-way valve between the first position and the second position, that is, to realize the reversal work of the four-way valve during the mutual transformation between the refrigeration mode and the heating mode.

[0027] The detection component is disposed in at least one of the first cavity and the second cavity to detect the vertical distance between the baffle and the end cover in the cavity where it is located. During the process of the four-way valve reversing for only a few seconds, in the prior art, the reversing result is detected by temperature, and the temperature change cannot correctly represent this instantaneous process. However, displacement is a physical quantity that can change instantaneously with the reversing process. Therefore, when the four-way valve is reversing, the slider inside the cavity of the valve body moves, which will cause the distance between the baffle and the end cover to change. The detection component timely detects the distance change. Through the detection result of the detection component, it is possible to timely obtain whether the four-way valve has successfully reversed. Compared with the traditional temperature detection, the present invention is more accurate and faster in judging the reversing result of the four-way valve by detecting the distance between the baffle and the end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in 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 some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 FIG. 1 is a schematic structural diagram of a four-way valve provided by an embodiment of the present invention.

[0030] Figure 2 FIG. 2 is a flowchart of a control method for a four-way valve provided by an embodiment of the present invention.

[0031] Reference numerals: 100, valve body; 110, air outlet pipe; 120, cavity; 130, first end cover; 140, second end cover; 200, slider; 300, first baffle; 400, second baffle; 500, first sensor; 600, second sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0033] As Figure 1As shown in the figure, the four-way valve provided by the embodiment of the present invention includes a valve body and a detection component. The valve body includes a valve body 100, a slider 200, a first baffle 300 and a second baffle 400. The valve body 100 is provided with an air outlet pipe 110 and a cavity 120 communicated with the air outlet pipe 110. Both ends of the cavity 120 are respectively provided with a first end cover 130 and a second end cover 140. The first baffle 300, the slider 200 and the second baffle 400 are sequentially connected and arranged inside the cavity 120 along the direction from the first end cover 130 to the second end cover 140. The slider 200 is communicated with the air outlet pipe 110. The detection component is arranged inside the cavity 120 and is adapted to detect at least one of the vertical distance between the first baffle 300 and the first end cover 130 and the vertical distance between the second baffle 400 and the second end cover 140.

[0034] For the four-way valve of the embodiment of the present invention, the valve body is mainly composed of a valve body 100, a slider 200, and a first baffle 300 and a second baffle 400 connected to the slider 200. A cavity 120 is arranged inside the valve body 100, and the air outlet pipe 110 is communicated with the cavity 120 of the valve body 100. The slider 200, the first baffle 300 and the second baffle 400 are connected into a whole and arranged inside the cavity 120. Both ends of the cavity 120 are closed by the first end cover 130 and the second end cover 140. Thus, a first cavity is formed between the first baffle 300 and the first end cover 130 in the valve body 100, and a second cavity is formed between the second baffle 400 and the second end cover 140. By adjusting the air pressure in the first cavity and the second cavity, the volume of the first cavity and the second cavity is changed. Further, the structural cylinder part of the first baffle 300, the slider 200 and the second baffle 400 moves. That is, under the pressure change on both sides of the first baffle 300 and the second baffle 400, the slider 200 can move inside the cavity 120, and further change the position where the slider 200 is communicated with the air outlet pipe 110, so as to realize the switching of the four-way valve between the first position and the second position. That is, during the mutual conversion between the refrigeration mode and the heating mode, the four-way valve performs the commutation work.

[0035] The detection component is arranged in at least one of the first cavity and the second cavity to detect the vertical distance between the baffle and the end cover in the cavity where it is located. During the commutation process of the four-way valve for only a few seconds, in the prior art, the commutation result is detected by temperature. The temperature change cannot correctly represent this instantaneous process. However, displacement is a physical quantity that can change instantaneously with the commutation process. Therefore, when the four-way valve is commuting, the movement of the slider 200 inside the cavity 120 of the valve body 100 will cause the distance between the baffle and the end cover to change. The detection component timely detects the distance change. Through the detection result of the detection component, it can be timely obtained whether the four-way valve has successfully commuted. Compared with the traditional temperature detection, the present invention is more accurate and faster in judging the commutation result of the four-way valve by detecting the distance between the baffle and the end cover.

[0036] In this embodiment, since the first baffle 300 and the second baffle 400 are connected as a whole through the guide frame and the slider 200, when the four-way valve changes its direction, when the slider 200 moves, the first cavity becomes larger, and the second cavity will become smaller. Therefore, the detection component can obtain the movement effect of the slider 200 by detecting the vertical distance between the baffle and the end cover of one of the first cavity and the second cavity.

[0037] In special cases, the detection component can also jointly detect the vertical distances between the baffles of the first cavity and the second cavity and the end covers, so as to obtain the movement effect of the slider 200. By analyzing and comparing the detection results of the two vertical distances, it is possible to avoid the problem that the first baffle 300, the second baffle 400 and the slider 200 are separated due to the detachment of the guide frame, and they cannot move synchronously as a whole, and the detection of a single vertical distance may not change.

[0038] According to an embodiment provided by the present invention, the detection component includes at least one of a first sensor 500 and a second sensor 600. The first sensor 500 is disposed on the first end cover 130 or the first baffle 300, and the second sensor 600 is disposed on the second end cover 140 or the second baffle 400. In this embodiment, the detection component can be at least one of two first sensors 500 and second sensors 600 for detecting the displacement distance. The first sensor 500 is located in the first cavity, and the second sensor 600 is located in the second cavity.

[0039] In this embodiment, the first sensor 500 is disposed on the first end cover 130, and the second sensor 600 is disposed on the second end cover 140. The positions of the end covers are fixed, the setting of the detection component is relatively stable, and the detection basis is also relatively stable. In other embodiments, the first sensor 500 and the second sensor 600 can be set simultaneously, or only one of them can be set, and different setting positions can be selected according to different sensor types.

[0040] Next, the control method of the four-way valve provided by the present invention will be described. The control method of the four-way valve described below can be mutually corresponding and referred to the four-way valve described above.

[0041] As Figure 2 shown, an embodiment of the present invention further provides a control method of a four-way valve, which is applied to the four-way valve as described in the above embodiment. The four-way valve is adapted to be switched from a first position to a second position. The first position is one of a refrigeration position and a heating position, and the second position is the other of the refrigeration position and the heating position. In the first position, the vertical distance between the first baffle 300 and the first end cover 130 is less than or equal to a first set distance, and the vertical distance between the second baffle 400 and the second end cover 140 is greater than or equal to a second set distance, including: Obtain a commutation instruction, and control the four-way valve to switch from the first position to the second position; Based on satisfying at least one of the first judgment condition and the second judgment condition, it is determined that the four-way valve has not switched from the first position to the second position, and the four-way valve is controlled to power off; Obtain a re-reversing instruction, and control the four-way valve to switch from the first position to the second position; The first judgment condition is that the vertical distance between the first baffle 300 and the first end cover 130 is less than or equal to the first set distance, and the second judgment condition is that the vertical distance between the second baffle 400 and the second end cover 140 is greater than or equal to the second set distance.

[0042] The control method of the four-way valve according to the embodiment of the present invention is combined with a detection method of a four-way valve. The four-way valve realizes the mutual switching between the heating mode and the cooling mode through commutation. When the four-way valve commutates, it switches from the first position to the second position, so that the four-way valve switches between the heating position and the cooling position, that is, the first position is the mode in which the four-way valve is located before switching, and the second position is the mode in which the four-way valve is located after switching. It is defined that when the four-way valve is in the first position, the first cavity is smaller than the second cavity, the vertical distance between the first baffle 300 and the first end cover 130 is less than or equal to the first set distance, and the vertical distance between the second baffle 400 and the second end cover 140 is greater than or equal to the second set distance. During the process of switching from the first position to the second position, the slider 200 moves away from the first end cover 130 and approaches the second end cover 140, making the first cavity increase and the second cavity decrease, that is, the vertical distance between the first baffle 300 and the first end cover 130 gradually increases, and the vertical distance between the second baffle 400 and the second end cover 140 gradually decreases. By detecting the vertical distance between the baffle and the end cover through the detection component, judging the relationship between the vertical distance between the first baffle 300 and the first end cover 130 and the first set distance, or judging the relationship between the vertical distance between the second baffle 400 and the second end cover 140 and the first set distance, it can be detected whether the four-way valve has successfully commutated.

[0043] If the judgment result is that at least one of the vertical distance between the first baffle 300 and the first end cover 130 is less than or equal to the first set distance and the vertical distance between the second baffle 400 and the second end cover 140 is greater than or equal to the second set distance, it is proved that the four-way valve commutation fails, the four-way valve is controlled to power off, a re-reversing instruction is obtained, and the four-way valve is controlled to re-commutate. If the judgment result is that the vertical distance between the first baffle 300 and the first end cover 130 is greater than the first set distance, and the vertical distance between the second baffle 400 and the second end cover 140 is less than the second set distance, it is proved that the four-way valve commutation is successful.

[0044] During the process of the four-way valve reversing for only a few seconds, in the prior art, the reversing result is detected by temperature. The temperature change cannot correctly represent this instantaneous process. However, displacement is a physical quantity that can change instantaneously with the reversing process. Therefore, when the four-way valve is reversing, the distance between the baffle and the end cover will change as the slider 200 inside the cavity 120 of the valve body 100 moves. The detection component can detect the distance change in a timely manner. Based on the detection result of the detection component, it is possible to obtain in a timely manner whether the four-way valve has successfully reversed. Compared with the traditional temperature detection, the present invention can more accurately and quickly judge the reversing result of the four-way valve by detecting the vertical distance between the baffle and the end cover.

[0045] In one embodiment, when switching from the refrigeration mode to the heating mode, the first position is the refrigeration position and the second position is the heating position. The left side of the slider 200 can be defined as the first baffle 300 and the first end plate, and the right side of the slider 200 can be defined as the second baffle 400 and the second end plate. When switching from the heating mode to the refrigeration mode, the first position is the heating position and the second position is the refrigeration position. The right side of the slider 200 can be defined as the first baffle 300 and the first end plate, and the left side of the slider 200 can be defined as the second baffle 400 and the second end plate.

[0046] According to an embodiment provided by the present invention, obtaining a re-reversing instruction and controlling the four-way valve to switch from the first position to the second position includes: Based on the completed number of re-reversings and the mapping relationship between the number of re-reversings and the set pressure difference, obtaining the set pressure difference for the current re-reversing; Based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing, controlling the four-way valve to be powered on for reversing.

[0047] In this embodiment, after the four-way valve fails to reverse, a re-reversing instruction is obtained, and the steps of re-reversing are automatically executed, thereby controlling the four-way valve to switch from the first position to the second position for correction.

[0048] The pressure difference is the pressure difference between the high pressure and the low pressure. The preset number of re-reversings is N times. The number of re-reversings from 1 to N times respectively has a corresponding set pressure difference, forming a mapping relationship between the number of re-reversings and the set pressure difference.

[0049] Obtaining the completed number of re-reversings can know the current number of re-reversings, that is, the current number of re-reversings is the completed number of re-reversings plus one. Based on the mapping relationship between the number of re-reversings and the set pressure difference, the set pressure difference for the current re-reversing can be correspondingly obtained. Judge the magnitude relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing, and control the four-way valve to be powered on for reversing. By automatically controlling the four-way valve to re-reverse, the failure of a single reversing resulting in shutdown can be avoided. If the re-reversing is successful, it can also avoid affecting the user experience and wasting the time and cost of after-sales maintenance personnel visiting.

[0050] According to an embodiment provided by the present invention, after controlling the four-way valve to be powered on for commutation based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-commutation, it further includes: Based on satisfying at least one of the first judgment condition and the second judgment condition, it is determined that the four-way valve has not switched from the first position to the second position, the four-way valve is powered off, and the current number of re-commutations is recorded as the number of completed re-commutations; Return to obtain the set pressure difference for the current re-commutation based on the number of completed re-commutations and the mapping relationship between the number of re-commutations and the set pressure difference.

[0051] In this embodiment, in the step of controlling the four-way valve to re-commute, after the four-way valve is powered on and re-commutes, the four-way valve is continuously detected for commutation. The detection method is still to determine whether the four-way valve commutes successfully according to the relationship between the vertical distance between the first baffle 300 and the first end cover 130 and the first set distance, or the relationship between the vertical distance between the second baffle 400 and the second end cover 140 and the first set distance. If the four-way valve fails to commute, the four-way valve is powered off again, and the current number of re-commutations is recorded as the number of completed re-commutations, and the re-commutation method is cyclically executed.

[0052] During the process of automatically controlling the four-way valve to re-commute, a commutation detection method for judging the commutation result of the four-way valve by detecting the vertical distance between the baffle and the end block is also added, which further improves the accuracy of the four-way valve commutation control and the detection speed.

[0053] According to an embodiment provided by the present invention, controlling the four-way valve to be powered on for commutation based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-commutation includes: Based on the number of completed re-commutations being 0 times, it is determined that the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-commutation, and the four-way valve is controlled to be powered on for commutation.

[0054] In this embodiment, during the process of the four-way valve re-commuting, the relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-commutation is judged. If the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-commutation and the current number of re-commutations is the first time, then the four-way valve coil is directly controlled to be powered on for commutation.

[0055] According to an embodiment provided by the present invention, controlling the four-way valve to be powered on for commutation based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-commutation further includes: It is determined that the actual pressure difference of the four-way valve is less than the set pressure difference for the current re-commutation, the compressor frequency is increased until the actual pressure difference of the four-way valve is equal to the set pressure difference for the current re-commutation, and the four-way valve is controlled to be powered on for commutation.

[0056] In this embodiment, during the process of the four-way valve re-reversing, the relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing is judged. If the actual pressure difference of the four-way valve is less than the set pressure difference for the current re-reversing, the compressor frequency is increased. When the actual pressure difference of the four-way valve reaches the set pressure difference for the current re-reversing, the four-way valve coil is immediately controlled to be powered on for reversing, and the current compressor frequency is kept fixed.

[0057] When the actual pressure difference of the four-way valve is less than the set pressure difference for the current re-reversing, it is necessary to first increase the actual pressure difference by increasing the compressor frequency. After reaching the set pressure difference, re-reversing is carried out, and then it can be confirmed whether the current set pressure difference can meet the reversing requirements, so as to ensure that the four-way valve is reversed under appropriate compressor operating frequency and pressure difference conditions.

[0058] According to an embodiment provided by the present invention, based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing, controlling the four-way valve to be powered on for reversing further includes: Based on the fact that the number of completed re-reversings is greater than or equal to 1 time, it is determined that the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-reversing, and the compressor frequency is decreased until the actual pressure difference of the four-way valve is equal to the set pressure difference for the current re-reversing, and the four-way valve is controlled to be powered on for reversing.

[0059] In this embodiment, during the process of the four-way valve re-reversing, the relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-reversing is judged. If the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-reversing, and in the case that the current number of re-reversings is not the first time, the compressor frequency is decreased. When the actual pressure difference of the four-way valve reaches the set pressure difference for the current re-reversing, the four-way valve coil is immediately controlled to be powered on for reversing, and the current compressor frequency is kept fixed.

[0060] When the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-reversing, it is necessary to first decrease the actual pressure difference by decreasing the compressor frequency. After reaching the set pressure difference, re-reversing is carried out, and then it can be confirmed whether the current set pressure difference can meet the reversing requirements, so as to ensure that the four-way valve is reversed under appropriate compressor operating frequency and pressure difference conditions.

[0061] According to an embodiment provided by the present invention, after recording the number of the current re-reversing as the number of completed re-reversings, it further includes: Determine that the number of completed re-reversings reaches the total number of re-reversings in the mapping relationship between the number of re-reversings and the set pressure difference, and control the compressor to stop.

[0062] In this embodiment, when the current re-reversing operation is completed and it is determined that the reversing fails after detection, the number of current re-reversings is recorded as the number of completed re-reversings, and then it is determined whether the number of completed re-reversings reaches the total number of re-reversings in the mapping relationship between the number of re-reversings and the set pressure difference. If it reaches, the compressor is controlled to stop.

[0063] According to the operating conditions of the compressor, the preset total number of re-reversings is limited. If the number of re-reversings reaches the total number of re-reversings and still cannot be reversed successfully, a fault is reported and the machine stops.

[0064] According to an embodiment provided by the present invention, in the mapping relationship between the number of re-reversings and the set pressure difference, the set pressure difference is positively correlated with the number of re-reversings, and the set pressure differences are in an increasing relationship. In this embodiment, as the number of re-reversings increases, the corresponding set pressure difference also increases, and the set pressure difference is in an increasing form to ensure that each re-reversing can be carried out under a larger pressure difference condition, effectively utilizing each re-reversing to quickly achieve the successful reversing of the four-way valve, improving the reversing efficiency, avoiding wasting the control action of re-reversing, and gradually increasing the set pressure difference also avoiding damage to the compressor and the four-way valve and system fluctuations caused by sudden pressure difference changes.

[0065] In this embodiment, if the pressure difference of the normal four-way valve is P, the set pressure difference corresponding to the first re-reversing is 1.1P, the set pressure difference corresponding to the second re-reversing is 1.2P, the set pressure difference corresponding to the third re-reversing is 1.3P, and so on.

[0066] According to an embodiment provided by the present invention, before obtaining the re-reversing instruction and controlling the four-way valve to switch from the first position to the second position, it further includes: Closing the outdoor unit fan; Controlling the opening of the electronic expansion valve of the indoor unit to be reduced to 1 / 5 of the maximum opening; Based on the fan speed being reduced to 0, obtaining the actual pressure difference of the four-way valve.

[0067] In this embodiment, the four-way valve is powered off to prepare for the next power-on. The control process of each re-reversing is as follows: Immediately close the outdoor unit fan to prevent the high pressure from decreasing. Reduce the opening of the electronic expansion valve of the operating indoor unit to 1 / 5 of the maximum opening. After the fan speed is reduced to 0, immediately obtain the real-time high pressure and low pressure, and calculate the actual pressure difference P0 of the four-way valve.

[0068] If the actual pressure difference P0 of the four-way valve ≥ the set pressure difference 1.1P corresponding to the first re-reversing, immediately control the four-way valve coil to be powered on. Complete the first automatic re-reversing control, and determine whether the reversing is successful after power-on.

[0069] If the actual pressure difference P0 of the four-way valve < the set pressure difference 1.1P corresponding to the first re-reversal, the compressor increases the frequency. When the actual pressure difference P0 of the four-way valve reaches the set pressure difference 1.1P corresponding to the first re-reversal, immediately control the four-way valve coil to be powered on and keep the current frequency fixed, and determine whether the reversal is successful.

[0070] After the first re-reversal fails, perform the second re-reversal. If the actual pressure difference P0 of the four-way valve ≥ the set pressure difference 1.2P corresponding to the second re-reversal, the compressor decreases the frequency. When it reaches the set pressure difference 1.2P corresponding to the second re-reversal, immediately control the four-way valve coil to be powered on and keep the current frequency fixed, and determine whether the reversal is successful.

[0071] If the continuous reversal fails to reach the preset total number of re-reversals, stop the machine in the form of a fault.

[0072] The air conditioner provided by the present invention will be described below. The air conditioner described below can be mutually corresponding and referred to the four-way valve and the control method of the four-way valve described above.

[0073] The embodiment of the present invention also provides an air conditioner, including the four-way valve as described in the above embodiment or implementing the control method of the four-way valve as described in the above embodiment.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A four-way valve, characterized in that, It includes a valve body and a detection component. The valve body includes a valve main body (100), a slider (200), a first baffle (300) and a second baffle (400). The valve main body (100) is provided with an air outlet pipe (110) and a cavity (120) communicated with the air outlet pipe (110). Both ends of the cavity (120) are respectively provided with a first end cover (130) and a second end cover (140). The first baffle (300), the slider (200) and the second baffle (400) are sequentially connected and arranged inside the cavity (120) along the direction from the first end cover (130) to the second end cover (140). The slider (200) is communicated with the air outlet pipe (110). The detection component is arranged inside the cavity (120) and is adapted to detect at least one of the vertical distance between the first baffle (300) and the first end cover (130) and the vertical distance between the second baffle (400) and the second end cover (140).

2. The four-way valve according to claim 1, characterized in that, The detection component includes at least one of a first sensor (500) and a second sensor (600). The first sensor (500) is arranged on the first end cover (130) or the first baffle (300), and the second sensor (600) is arranged on the second end cover (140) or the second baffle (400).

3. A control method for a four-way valve, characterized in that, Applied to the four-way valve according to claim 1 or 2, the four-way valve is adapted to be switched from a first position to a second position. The first position is one of a refrigeration position and a heating position, and the second position is the other of the refrigeration position and the heating position. In the first position, the vertical distance between the first baffle (300) and the first end cover (130) is less than or equal to a first set distance, and the vertical distance between the second baffle (400) and the second end cover (140) is greater than or equal to a second set distance, including: Obtain a commutation instruction and control the four-way valve to switch from the first position to the second position; Based on satisfying at least one of a first judgment condition and a second judgment condition, determine that the four-way valve has not been switched from the first position to the second position, and control the four-way valve to power off; Obtain a re-commutation instruction and control the four-way valve to switch from the first position to the second position; The first judgment condition is that the vertical distance between the first baffle (300) and the first end cover (130) is less than or equal to the first set distance, and the second judgment condition is that the vertical distance between the second baffle (400) and the second end cover (140) is greater than or equal to the second set distance.

4. The control method of the four-way valve according to claim 3, characterized in that The obtaining the re-commutation instruction and controlling the four-way valve to switch from the first position to the second position includes: Based on the completed number of re-commutations and the mapping relationship between the number of re-commutations and the set pressure difference, obtain the set pressure difference for the current re-commutation; Based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-commutation, control the four-way valve to be powered on for commutation.

5. The control method of the four-way valve according to claim 4, wherein, After controlling the four-way valve to be powered on for commutation based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-commutation, it further includes: Based on satisfying at least one of the first judgment condition and the second judgment condition, it is determined that the four-way valve has not been switched from the first position to the second position, the four-way valve is powered off, and the current number of re-directions is recorded as the completed number of re-directions; Return the set pressure difference for the current re-direction obtained based on the completed number of re-directions and the mapping relationship between the number of re-directions and the set pressure difference.

6. The control method of the four-way valve according to claim 4, characterized in that, The controlling the four-way valve to be powered on for re-direction based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-direction includes: When the completed number of re-directions is 0, it is determined that the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-direction, and the four-way valve is controlled to be powered on for re-direction.

7. The control method of the four-way valve according to claim 4, characterized in that The controlling the four-way valve to be powered on for re-direction based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-direction further includes: It is determined that the actual pressure difference of the four-way valve is less than the set pressure difference for the current re-direction, the compressor frequency is increased until the actual pressure difference of the four-way valve is equal to the set pressure difference for the current re-direction, and the four-way valve is controlled to be powered on for re-direction.

8. The control method of the four-way valve according to claim 4, characterized in that, The controlling the four-way valve to be powered on for re-direction based on the comparison relationship between the actual pressure difference of the four-way valve and the set pressure difference for the current re-direction further includes: When the completed number of re-directions is greater than or equal to 1, it is determined that the actual pressure difference of the four-way valve is greater than or equal to the set pressure difference for the current re-direction, the compressor frequency is decreased until the actual pressure difference of the four-way valve is equal to the set pressure difference for the current re-direction, and the four-way valve is controlled to be powered on for re-direction.

9. The control method of the four-way valve according to claim 5, wherein After recording the current number of re-directions as the completed number of re-directions, it further includes: It is determined that the completed number of re-directions reaches the total number of re-directions in the mapping relationship between the number of re-directions and the set pressure difference, and the compressor is controlled to stop.

10. The control method of the four-way valve according to claim 4, characterized in that, In the mapping relationship between the number of re-directions and the set pressure difference, the set pressure difference is positively correlated with the number of re-directions, and each set pressure difference is in an increasing relationship.

11. The control method of the four-way valve according to any one of claims 3 to 10, characterized in that, Before obtaining the re-direction instruction and controlling the four-way valve to switch from the first position to the second position, it further includes: Turn off the outdoor unit fan; Control the opening of the electronic expansion valve of the indoor unit to be reduced to 1 / 5 of the maximum opening; Based on the fan speed being reduced to 0, obtain the actual pressure difference of the four-way valve.

12. An air conditioner, characterized in that, It includes the four-way valve according to claim 1 or 2 or the control method of the four-way valve implementing any one of claims 3 to 11.

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