Booster pump, multi-split air conditioning system and control method

Abstract

The invention provides a booster pump, a multi-split air conditioning system and a control method.The booster pump comprises a first driving mechanism, a cylinder body, a sliding piece, a crankshaft and a roller fixedly arranged on an eccentric part of the crankshaft in a sleeving mode, the cylinder body is provided with a compression cavity, the roller is located in the compression cavity, and the cylinder body is further provided with a first flow channel opening and a second flow channel opening which are communicated with the interior; the cylinder body is provided with a slip sheet groove penetrating to the compression cavity, and the first driving mechanism is used for driving the slip sheet to move along the slip sheet groove; wherein the booster pump has a booster pumping mode and a bypass mode; in the booster pumping mode, the first driving mechanism drives the sliding piece to abut against the roller. In the bypass mode, the first driving mechanism drives the sliding piece to loosen the roller. Compared with a booster pump only having a boosting function in the prior art, the booster pump integrates the boosting function and the bypass function at the same time, so that the booster pump does not need to be matched with a bypass branch when the boosting function is not needed, installation of the bypass branch can be omitted, and the installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of booster pumps, and particularly relates to a booster pump, a multi-connected air conditioning system, and a control method. BACKGROUND

[0002] At present, in an air conditioning system, if there is a certain pipe length and height difference between the indoor unit and the outdoor unit, due to the existence of pipe resistance loss and drop loss, the pressure at the bottom of the system is relatively large, which leads to an increase in the outlet pressure of the compressor, an increase in the power consumption of the compressor, and a poor energy efficiency and a serious capacity attenuation. For this kind of situation, a booster pump is generally arranged on the pipe of the air conditioning system to assist the compressor in increasing the refrigerant pressure. The booster pump is also connected in parallel with a bypass branch, and a switch valve is arranged on the bypass branch. If the booster pump needs to be used to increase the pressure, the switch valve is closed, and the refrigerant passes through the booster pump to be pressurized by the booster pump. If the booster pump does not need to be used to increase the pressure, the switch valve is opened, and the refrigerant passes through the bypass branch.

[0003] In order to make the air conditioning system have the functions of pressure increase and bypass at the same time, the booster pump and the bypass branch need to be respectively installed, which leads to a complicated installation, and thus the problem needs to be solved. SUMMARY

[0004] Therefore, the present application provides a booster pump, a multi-connected air conditioning system, and a control method, which can solve the technical problem that, in the prior art, in order to make the air conditioning system have the functions of pressure increase and bypass at the same time, the booster pump and the bypass branch need to be respectively installed, which leads to a complicated installation.

[0005] In order to solve the above problems, the present application provides a booster pump, which comprises a first driving mechanism, a cylinder body, a sliding vane, a crankshaft, and a roller fixed on the eccentric part of the crankshaft. The cylinder body has a compression cavity, and the roller is located in the compression cavity. The cylinder body is further provided with a first flow channel opening and a second flow channel opening which are connected to the inside. The cylinder body is provided with a sliding vane groove which penetrates the compression cavity. The sliding vane groove is located between the first flow channel opening and the second flow channel opening. The first driving mechanism is used to drive the sliding vane to move along the sliding vane groove. The booster pump has a booster pumping mode and a bypass mode. In the booster pumping mode, the first driving mechanism drives the sliding vane to abut against the roller, so as to divide the compression cavity into a suction flow cavity which is connected to the first flow channel opening and a discharge flow cavity which is connected to the second flow channel opening. The roller is used to rotate under the driving of the crankshaft, so as to drive the fluid to be sucked from the first flow channel opening, compressed, and discharged through the second flow channel opening. The sliding vane can float along with the rotation of the roller. In the bypass mode, the first driving mechanism drives the sliding vane to release the roller, so that the first flow channel opening and the second flow channel opening can be connected through the compression cavity.

[0006] In some embodiments, in the bypass mode, there is a gap between the slide and the roller, allowing the first flow channel and the second flow channel to communicate through the gap inside the compression chamber.

[0007] In some embodiments, the first drive mechanism is connected to the slide plate via an elastic element, so as to drive the slide plate to move by driving the elastic element, and the slide plate can float with the rotation of the roller in the booster pumping mode.

[0008] In some embodiments, the first drive mechanism includes a stator and a rotor, the cylinder body is provided with a threaded hole, the rotor is threadedly engaged with the threaded hole, the first drive mechanism is connected to the elastic element through the rotor, and the rotor can rotate relative to the slide plate; The stator is used to drive the rotor to rotate forward or in reverse. When the rotor rotates forward, it approaches the roller along the threaded hole and pushes the slide plate against the roller through the elastic element. When the rotor rotates in reverse, it moves away from the roller along the threaded hole and drives the slide plate to release the roller through the elastic element.

[0009] In some embodiments, the rotor is connected to one end of the elastic member via a connector, and the elastic member is connected to the slide plate via the other end; The rotor has an annular groove at one end, and the connector has a hook. The connector is hooked into the annular groove by the hook, and the hook and the annular groove are rotatably engaged so that the rotor can rotate relative to the connector.

[0010] In some embodiments, the booster pump further includes a second drive mechanism for driving the crankshaft to rotate.

[0011] The present invention also provides a multi-split air conditioning system, which includes the booster pump described in any one of the above descriptions; the multi-split air conditioning system further includes two or more outdoor units and two or more indoor units, wherein each outdoor unit is arranged in parallel and each indoor unit is also arranged in parallel; wherein the liquid pipe of each outdoor unit is connected to the liquid pipe of each indoor unit through the same main liquid pipe, and the gas pipe of each outdoor unit is connected to the gas pipe of each indoor unit through the same main gas pipe; The booster pump is connected in series on the main liquid pipe through the first flow channel and the second flow channel.

[0012] In some implementations, the number of outdoor units is less than the number of indoor units.

[0013] The present invention also provides a control method for the above-described multi-split air conditioning system, which includes the following steps: Step S1: Obtain the mass flow rate q of the compressor in each outdoor unit (11) and sum them up to obtain the total circulating flow rate Q of the system; Step S2: Obtain the refrigerant mass density at the liquid pipe outlet of each outdoor unit (11) and calculate the average refrigerant mass density ρ; Step S3: Based on the total circulation flow rate q and the average refrigerant mass density ρ of the system, obtain the expected speed V of the booster pump, V=Q / ρ; Step S4: Adjust the speed of the booster pump to the expected speed.

[0014] In some implementations, when the installation height of each indoor unit is greater than the installation height of each outdoor unit, if the multi-split air conditioning system is in cooling operation, the booster pump is controlled to operate in the booster pumping mode; if the multi-split air conditioning system is in heating operation, the booster pump is controlled to operate in the bypass mode.

[0015] The booster pump, multi-split air conditioning system, and control method provided by this invention have the following beneficial effects: This invention, through a first driving mechanism, drives a sliding vane to abut against or release the roller, enabling the booster pump of this invention to simultaneously possess a boosting function operating in boosting pumping mode and a bypass function operating in bypass mode. Compared to booster pumps in the prior art that only have a boosting function, the booster pump of this invention integrates both boosting and bypass functions. Thus, when the boosting function is not needed, it does not need to be used in conjunction with a bypass branch, thereby eliminating the need for bypass branch installation and improving installation efficiency. Attached Figure Description

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a booster pump provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of the booster pump of the present invention in booster pumping mode; Figure 3 This is a schematic diagram of the booster pump of the present invention in bypass mode; Figure 4 This is a schematic diagram showing the rotor being connected to the sliding plate in sequence through connecting parts and elastic parts; Figure 5 This is a schematic diagram of the cooling operation of a multi-split air conditioning system according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the heating operation of a multi-split air conditioning system provided in an embodiment of the present invention.

[0018] The attached figures are labeled as follows: 1. Motor; 2. Crankshaft; 3. Cylinder block; 4. Roller; 5. Sliding vane; 6. Elastic element; 7. Connecting element; 8. Rotor; 9. Stator; 10. Threaded hole; 11. Outdoor unit; 12. Indoor unit; 13. Main liquid pipe; 14. Main gas pipe; 31. First flow channel opening; 32. Second flow channel opening; 33. Compression chamber; 51. Sliding vane groove; 71. Hook; 81. Annular groove; 301. Gap; 331. Suction chamber; 332. Exhaust chamber; 100. Booster pump. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0021] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0022] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0023] See also Figures 1-3 As shown, according to an embodiment of the present invention, a booster pump 100 is provided, which includes a first drive mechanism, a cylinder 3, a vane 5, a crankshaft 2, and a roller 4 fitted onto the eccentric portion of the crankshaft. The cylinder 3 has a compression chamber 33, and the roller 4 is located within the compression chamber 33. The cylinder 3 is also provided with a first flow channel 31 and a second flow channel 32 communicating with the interior. The cylinder 3 is provided with a vane groove 51 extending through to the compression chamber 33. The vane groove 51 is located between the first flow channel 31 and the second flow channel 32, and the vane 5 is slidably disposed within the vane groove 51. The first drive mechanism is used to drive the vane 5 to move along the vane groove 51.

[0024] The booster pump 100 has a booster pumping mode and a bypass mode. In booster pumping mode, such as Figure 2 As shown, the first drive mechanism drives the vane 5 to abut against the roller 4, dividing the compression chamber 33 into a suction chamber 331 communicating with the first flow channel 31 and a discharge chamber 332 communicating with the second flow channel 32; the roller 4 is used to rotate under the drive of the crankshaft 2, so as to drive the fluid to be sucked in from the first flow channel 31, compressed, and then discharged through the second flow channel 32; and the vane 5 can float with the rotation of the roller 4. In bypass mode, as Figure 3 As shown, the first drive mechanism drives the slide 5 to release the roller 4, so that the first flow channel 31 and the second flow channel 32 can be connected through the compression chamber 33.

[0025] In the above example, the first drive mechanism drives the sliding vane 5 to abut against or release the roller 4, so that the booster pump 100 of the present invention simultaneously has a boosting function operating in boosting pumping mode and a bypass function operating in bypass mode. Compared with the booster pumps of the prior art that only have a boosting function, the booster pump 100 of the present invention integrates both boosting and bypass functions. Thus, when the boosting function is not needed, it does not need to be used in conjunction with a bypass branch, thereby eliminating the need for the installation of a bypass branch and improving installation efficiency.

[0026] In some implementations, such as Figure 3 As shown, in the bypass mode described above, the first drive mechanism drives the slide 5 to move, so that there is a gap 301 between the slide 5 and the roller 4. This allows the first flow channel 31 and the second flow channel 32 to be connected through the gap 301 inside the compression chamber 33, thereby realizing the function that the first flow channel 31 and the second flow channel 32 can be connected through the compression chamber 33 in the bypass mode.

[0027] In order to enable the vane 5 to float with the rotation of the roller 4 in the booster pumping mode, in some embodiments, such as Figure 2 As shown, the aforementioned first drive mechanism can be connected to the slide plate 5 via the elastic element 6, so as to drive the slide plate 5 to move by driving the elastic element 6, and so that the slide plate 5 can float with the rotation of the roller 4 in the booster pumping mode.

[0028] In the example above, the elastic element 6 allows the slide 5 to float as the roller 4 rotates during the booster pumping mode. The elastic element 6 can be a spring or flexible plastic, etc.

[0029] To achieve the function of the aforementioned first driving mechanism, in some embodiments, such as Figure 2 As shown, the aforementioned first driving mechanism may include a stator 9 and a rotor 8. The aforementioned cylinder 3 is provided with a threaded hole 10, and the rotor 8 is threadedly engaged with the threaded hole 10. The first driving mechanism is connected to the elastic element 6 via the rotor 8, and the rotor 8 can rotate relative to the sliding plate 5. The stator 9 is used to drive the rotor 8 to rotate forward or backward. When rotating forward, the rotor 8 moves closer to the roller 4 along the threaded hole 10, and pushes the sliding plate 5 against the roller 4 via the elastic element 6. When rotating backward, the rotor 8 moves away from the roller 4 along the threaded hole 10, and drives the sliding plate 5 to release the roller 4 via the elastic element 6.

[0030] In the above example, since the rotor 8 and the threaded hole 10 are threadedly engaged, when the stator 9 drives the rotor 8 to rotate, the rotor 8 will move closer to or further away from the roller 4 along the threaded hole 10 under the action of the thread. While the rotor 8 moves along the threaded hole 10, it will simultaneously push the slide 5 to move through the elastic element 6, so that the slide 5 abuts against the roller 4, or so that the slide 5 releases the roller 4, thus realizing the function of the aforementioned first drive mechanism.

[0031] It should be noted that the aforementioned stator 9 may also be referred to as the excitation coil in some contexts, and the aforementioned rotor 8 may also be referred to as the ejector pin in some contexts.

[0032] Among them, such as Figure 2 As shown, in the booster pumping mode: the stator 9 generates a downward excitation effect, the rotor 8 moves downward along the threaded hole 10, and the rotor 8 drives the elastic element 6 to press down, forcing the vane 5 to contact the roller 4. At this time, the vane 5, the roller 4, and the cylinder form a closed space to achieve the booster pumping function. In this booster pumping mode, the crankshaft 2 drives the roller 4 to rotate continuously to pump liquid refrigerant.

[0033] like Figure 3 As shown, in bypass mode: the crankshaft 2 does not rotate, the stator 9 generates an upward excitation effect, the rotor 8 moves upward along the threaded hole 10, and the rotor 8 drives the slide 5 upward through the elastic element 6, forcing the slide 5 to not contact the roller 4. At this time, the slide 5, the roller 4 and the cylinder cannot form a closed space. The first flow channel 31 and the second flow channel 32 are connected through the compression chamber 33, thereby achieving the bypass function.

[0034] To achieve the aforementioned function that the rotor 8 can rotate relative to the slider 5, in some embodiments, such as Figure 3 As shown, the aforementioned rotor 8 can be connected to one end of the elastic member 6 via the connecting member 7, and the elastic member 6 is connected to the slider 5 via the other end. The rotor 8 can rotate relative to the connecting member 7. Since the slider 5 is also connected to the connecting member 7 via the elastic member 6, the slider 5 and the connecting member 7 form a whole. When the rotor 8 rotates relative to the connecting member 7, the rotor 8 also rotates relative to the slider 5 at the same time, thereby realizing the aforementioned function that the rotor 8 can rotate relative to the slider 5.

[0035] To enable the rotor 8 to rotate relative to the connecting member 7, such as Figure 3 As shown, one end of the rotor 8 may be provided with an annular groove 81, and the connector 7 is provided with a hook 71. The connector 7 is hooked into the annular groove 81 by the hook 71, and the hook 71 is rotatably engaged with the annular groove 81. The number of hooks 71 can be two or more, and they are evenly spaced along the circumference of the annular groove 81. Of course, there can also be only one hook 71, but the hook 71 is an annular hook.

[0036] In some embodiments, the aforementioned booster pump 100 may further include a second drive mechanism for driving the crankshaft 2 to rotate, thereby achieving automated control of the crankshaft 2's rotation. For example... Figure 1 As shown, the second drive mechanism may include a motor 1 to drive the crankshaft 2 to rotate via the motor 1.

[0037] In some embodiments, the aforementioned booster pump 100 may be a fluorine pump.

[0038] In some implementations, such as Figures 5-6 As shown, the present invention also provides a multi-split air conditioning system, which may include the booster pump 100 of any of the above-mentioned methods. The multi-split air conditioning system also includes two or more outdoor units 11 and two or more indoor units 12. Each outdoor unit 11 is connected in parallel, and each indoor unit 12 is also connected in parallel. The liquid pipes of each outdoor unit 11 are connected to the liquid pipes of each indoor unit 12 through the same main liquid pipe 13, and the gas pipes of each outdoor unit 11 are connected to the gas pipes of each indoor unit 12 through the same main gas pipe 14. The booster pump 100 is connected in series on the main liquid pipe 13 through a first flow channel 31 and a second flow channel 32.

[0039] In a specific application example, the number of outdoor units 11 is less than the number of indoor units 12.

[0040] In existing technologies, with the increasing cooling-to-weight ratio of multi-split air conditioning systems, the maximum cooling capacity of a single multi-split unit has exceeded 100kW, and the total cooling capacity of modular air conditioning systems with multiple units connected in parallel has reached over 500kW. These multi-split systems are typically installed in high-rise buildings where there is a significant height difference between the indoor and outdoor units. Due to the large height difference and long piping between the indoor and outdoor units, pressure loss is significant. Therefore, the height difference between the indoor and outdoor units in multi-split systems is usually controlled within 110m, and the total connecting pipe length is typically around 1000 meters, making it unsuitable for applications with even greater height differences. Simultaneously, the large height difference results in higher pressure at the bottom of the system, leading to increased compressor outlet pressure, increased compressor power consumption, poor energy efficiency, and severe capacity reduction. Furthermore, under ultra-high height installation conditions, insufficient refrigerant subcooling and severe refrigerant vaporization during transit result in excessively dry inlet to the indoor unit evaporator, significantly reducing performance.

[0041] The present invention, by adding the aforementioned booster pump 100 to the system, has the following advantages: (1) it can significantly increase the installation height difference between indoor and outdoor units and the total length of the connecting pipes between indoor and outdoor units; (2) it can significantly reduce the capacity attenuation rate under ultra-high height difference and ultra-long connecting pipe installation conditions; (3) it can significantly reduce the power consumption of the compressor to overcome gravity and improve the energy efficiency of the air conditioning system; (4) it can improve the refrigerant distribution balance rate between indoor units 12. Thus, the present invention solves the following problems: (1) it solves the problem that multi-split units cannot be used normally under ultra-high height difference and ultra-long connecting pipes; (2) it solves the problem that under ultra-high height difference, the liquid pipe causes refrigerant vaporization due to pressure drop, resulting in severe performance degradation in multi-split units; (3) it solves the problem that under ultra-high height difference, the compressor exhaust port pressure increases, leading to increased compressor power consumption in multi-split units; (4) it solves the problem that under ultra-high height difference and ultra-long connecting pipes, the last indoor unit in multi-split units suffers from insufficient liquid supply due to excessive pressure loss, resulting in no cooling capacity.

[0042] In some embodiments, the number of the aforementioned booster pumps 100 can be two or more, connected in series. The installation position of each booster pump 100 can be calculated based on its own head. The number of booster pumps 100 can be calculated based on the height difference and the total refrigerant flow rate. Multiple booster pumps 100 connected in series can be used for staged pressurization to achieve a higher height difference.

[0043] In a specific application example, the number of outdoor units 11 can be 5, and these 5 outdoor units 11 are connected in parallel to form a modular outdoor unit unit. The number of indoor units 12 can be 10, and these 10 indoor units 12 are connected in parallel to form a modular indoor unit unit. One end of the main liquid pipe 13 can be connected to the liquid pipe of each outdoor unit 11 via a branch pipe, and the other end of the main liquid pipe 13 can be connected to the liquid pipe of each indoor unit 12 via a branch pipe. Similarly, one end of the main gas pipe 14 is also connected to the gas pipe of each outdoor unit 11 via a branch pipe, and the other end of the main gas pipe 14 is also connected to the gas pipe of each indoor unit 12 via a branch pipe.

[0044] In some embodiments, the present invention also provides a control method for the above-mentioned multi-split air conditioning system, which includes the following steps: Step S1: Obtain the mass flow rate q of the compressor in each outdoor unit 11, and sum them to obtain the total circulating flow rate Q of the system. The total circulating flow rate q of the system is the sum of the mass flow rates of the compressors in each outdoor unit 11.

[0045] The method for obtaining the mass flow rate q of the compressor in each outdoor unit 11 is existing technology. Specifically, the compressor mass flow rate q = refrigerant density at the compressor inlet * compressor cylinder volume * compressor speed.

[0046] Step S2: Obtain the refrigerant mass density at the liquid pipe outlet of each outdoor unit 11, and calculate the average refrigerant mass density ρ.

[0047] The method for obtaining the refrigerant mass density at the liquid pipe outlet of the outdoor unit 11 is existing technology. Specifically, the refrigerant mass density at the liquid pipe outlet of the outdoor unit 11 can be calculated from the pressure P and temperature T at the liquid pipe outlet of the outdoor unit 11.

[0048] Step S3: Based on the total circulation flow rate Q and the average refrigerant mass density ρ of the system, obtain the expected speed V of the booster pump 100, V=Q / ρ.

[0049] Step S4: Adjust the speed of booster pump 100 to the expected speed in step S3 above.

[0050] In the example above, by adjusting the speed of the booster pump 100 through steps S1-S4, the adaptive adjustment of the booster pump speed and the system refrigerant quantity can be achieved.

[0051] In some embodiments, when the installation height of each indoor unit 12 is greater than the installation height of each outdoor unit 11, if the multi-split air conditioning system is in cooling operation, the booster pump 100 is controlled to operate in the booster pumping mode; if the multi-split air conditioning system is in heating operation, the booster pump 100 is controlled to operate in the bypass mode.

[0052] To facilitate understanding, the cooling and heating cycles of the above-mentioned multi-split air conditioning system will be explained in detail below.

[0053] I. Refrigeration Cycle: like Figure 5 As shown, the booster pump 100 operates in booster pumping mode. When the high-temperature and high-pressure liquid refrigerant discharged from each outdoor unit 11 is combined, it is pressurized by the booster pump 100 through the main liquid pipe 13 and reaches each indoor unit 12. Inside the indoor unit 12, it is throttled into a low-temperature and low-pressure liquid. After passing through the heat exchanger, it becomes a low-temperature and low-pressure gas. Then, it is combined into the main gas pipe 14 through the branch pipe and returns to each outdoor unit 11, forming a complete refrigeration cycle.

[0054] II. Heating Cycle: like Figure 6 As shown, the booster pump 100 operates in bypass mode. When the high-temperature, high-pressure gaseous refrigerant discharged from each outdoor unit 11 merges, it travels through the main gas pipe 14 to each indoor unit 12. After passing through the heat exchanger, it becomes a high-temperature, low-pressure liquid, which then merges into the main liquid pipe 13 via a branch pipe. After passing through the booster pump 100, it returns to each outdoor unit 11 for throttling and heat exchange, forming a complete heating cycle. In this heating cycle, the gas pipe contains gas, so the pressure decreases and is less affected by gravity. The liquid pipe, from top to bottom, has an increasing pressure, therefore no booster is needed.

[0055] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A booster pump (100), characterized in that: The assembly includes a first drive mechanism, a cylinder (3), a sliding vane (5), a crankshaft (2), and a roller (4) fitted on the eccentric part of the crankshaft. The cylinder (3) has a compression chamber (33), and the roller (4) is located inside the compression chamber (33). The cylinder (3) is also provided with a first flow channel (31) and a second flow channel (32) communicating with the interior. The cylinder (3) is provided with a sliding vane groove (51) that extends through the compression chamber (33). The sliding vane groove (51) is located between the first flow channel (31) and the second flow channel (32). The first drive mechanism is used to drive the sliding vane (5) to move along the sliding vane groove (51). The booster pump (100) has a booster pumping mode and a bypass mode. In the booster pumping mode, the first drive mechanism drives the vane (5) to abut against the roller (4) to divide the compression chamber (33) into a suction chamber (331) connected to the first flow channel (31) and a discharge chamber (332) connected to the second flow channel (32). The roller (4) is used to rotate under the drive of the crankshaft (2) to drive the fluid to be sucked in from the first flow channel (31), compressed, and discharged through the second flow channel (32). The vane (5) can float with the rotation of the roller (4). In the bypass mode, the first drive mechanism drives the vane (5) to release the roller (4) so ​​that the first flow channel (31) and the second flow channel (32) can be connected through the compression chamber (33).

2. The booster pump (100) according to claim 1, characterized in that: In the bypass mode, there is a gap (301) between the slide (5) and the roller (4), so that the first flow channel (31) and the second flow channel (32) are connected through the gap (301) inside the compression chamber (33).

3. The booster pump (100) according to claim 1, characterized in that: The first driving mechanism is connected to the slide (5) via an elastic element (6) so as to drive the slide (5) to move by driving the elastic element (6) and so that the slide (5) can float with the rotation of the roller (4) in the booster pumping mode.

4. The booster pump (100) according to claim 3, characterized in that: The first driving mechanism includes a stator (9) and a rotor (8). The cylinder body (3) is provided with a threaded hole (10). The rotor (8) is threadedly engaged with the threaded hole (10). The first driving mechanism is connected to the elastic element (6) through the rotor (8), and the rotor (8) can rotate relative to the slide plate (5). The stator (9) is used to drive the rotor (8) to rotate forward or backward; when rotating forward, the rotor (8) moves closer to the roller (4) along the threaded hole (10) and pushes the slide (5) against the roller (4) through the elastic element (6); when rotating backward, the rotor (8) moves away from the roller (4) along the threaded hole (10) and drives the slide (5) to release the roller (4) through the elastic element (6).

5. The booster pump (100) according to claim 4, characterized in that: The rotor (8) is connected to one end of the elastic member (6) via a connector (7), and the elastic member (6) is connected to the slide plate (5) via the other end; The rotor (8) has an annular groove (81) at one end, and the connector (7) has a hook (71). The connector (7) is hooked in the annular groove (81) by the hook (71), and the hook (71) and the annular groove (81) are rotatably engaged so that the rotor (8) can rotate relative to the connector (7).

6. The booster pump (100) according to any one of claims 1-5, characterized in that: It also includes a second drive mechanism for driving the crankshaft (2) to rotate.

7. A multi-split air conditioning system, characterized in that: The system includes a booster pump (100) as described in any one of claims 1-6; the multi-split air conditioning system further includes two or more outdoor units (11) and two or more indoor units (12), wherein each outdoor unit (11) is connected in parallel and each indoor unit (12) is also connected in parallel; wherein the liquid pipe of each outdoor unit (11) is connected to the liquid pipe of each indoor unit (12) through the same main liquid pipe (13), and the gas pipe of each outdoor unit (11) is connected to the gas pipe of each indoor unit (12) through the same main gas pipe (14); The booster pump (100) is connected in series with the main liquid pipe (13) through the first flow port (31) and the second flow port (32).

8. The multi-split air conditioning system according to claim 7, characterized in that: The number of outdoor units (11) is less than the number of indoor units (12).

9. A control method for a multi-split air conditioning system as described in claim 7 or 8, characterized in that: Includes the following steps: Step S1: Obtain the mass flow rate q of the compressor in each outdoor unit (11) and sum them up to obtain the total circulating flow rate Q of the system; Step S2: Obtain the refrigerant mass density at the liquid pipe outlet of each outdoor unit (11) and calculate the average refrigerant mass density ρ; Step S3: Based on the total circulation flow rate q and the average refrigerant mass density ρ of the system, obtain the expected speed V of the booster pump (100), V=Q / ρ; Step S4: Adjust the speed of the booster pump (100) to the expected speed.

10. The control method according to claim 9, characterized in that: When the installation height of each indoor unit (12) is greater than the installation height of each outdoor unit (11), If the multi-split air conditioning system is in cooling operation, the booster pump (100) is controlled to operate in the booster pumping mode; if the multi-split air conditioning system is in heating operation, the booster pump (100) is controlled to operate in the bypass mode.

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