A liquid accumulator, compressor assembly and air conditioner

Abstract

The application provides a liquid accumulator, a compressor assembly and an air conditioner. The liquid accumulator comprises a shell, an inlet pipe, an outlet pipe and a piston assembly, and the piston assembly has a variable volume cavity inside. In a first working condition, the suction pressure in the outlet pipe is a first pressure, in a second working condition, the suction pressure in the outlet pipe is a second pressure, the second pressure is greater than the first pressure, the pressure in the variable volume cavity is a third pressure, and the pressure difference between the third pressure and the first pressure in the first working condition can drive the piston assembly to open a first oil return hole, so that the liquid refrigerant can be discharged from the first oil return hole. In the second working condition, the pressure difference between the second pressure and the third pressure can drive the piston assembly to close the first oil return hole, so that the liquid refrigerant cannot be discharged from the first oil return hole. According to the application, the amount of refrigerant stored at the bottom of the liquid accumulator can be small in the low-temperature heating working condition and the maximum refrigeration working condition, and the amount of refrigerant stored at the bottom of the liquid accumulator can be large in the rated refrigeration working condition and the low-temperature intermediate refrigeration working condition, so that the energy efficiency of the air conditioning system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to a liquid accumulator, a compressor assembly and an air conditioner. BACKGROUND

[0002] With the increasingly fierce market competition, air conditioner systems are getting smaller and smaller, and system matching is getting more and more refined; among them, the height of the oil return hole of the compressor distributor is becoming more and more important.

[0003] This is because, under low temperature heating and maximum refrigeration conditions, the amount of refrigerant stored at the bottom of the distributor needs to be small to exert the system capacity and meet the maximum refrigeration and low temperature heating capacity requirements; but if the oil return hole is too low, the amount of circulating liquid refrigerant in the system is too large under rated refrigeration and low temperature intermediate refrigeration conditions, which seriously affects the performance of the compressor.

[0004] That is, under low temperature heating and maximum refrigeration conditions, the first oil return hole of the distributor needs to be low, while under rated refrigeration and low temperature intermediate refrigeration conditions, the first oil return hole needs to be high.

[0005] Since the distributor in the prior art cannot simultaneously ensure that the amount of refrigerant stored at the bottom of the distributor is small under low temperature heating and maximum refrigeration conditions, and the amount of refrigerant stored at the bottom of the distributor is large under rated refrigeration and low temperature intermediate refrigeration conditions, the present application researches and designs a liquid accumulator, a compressor assembly and an air conditioner. SUMMARY

[0006] Therefore, the technical problem to be solved by the present application is to overcome the defects in the prior art that the distributor cannot simultaneously ensure that the amount of refrigerant stored at the bottom of the distributor is small under low temperature heating and maximum refrigeration conditions, and the amount of refrigerant stored at the bottom of the distributor is large under rated refrigeration and low temperature intermediate refrigeration conditions, thereby providing a liquid accumulator, a compressor assembly and an air conditioner.

[0007] In order to solve the above problems, the present application provides a liquid accumulator, which comprises:

[0008] a housing, an inlet pipe, an outlet pipe and a piston assembly, the inlet pipe being in communication with the inside of the housing, the outlet pipe being provided from one end of the housing into the inside of the housing,

[0009] a first oil return hole is provided on the outlet pipe, the first oil return hole being located in the housing, the first oil return hole being capable of communicating the inside of the housing with the inside of the outlet pipe, the piston assembly having a variable cavity inside; at least part of the structure of the piston assembly is arranged opposite to the first oil return hole;

[0010] The suction pressure in the outlet pipe in the first working condition is a first pressure, the inside of the shell is communicated with the outlet pipe, and the pressure in the inside of the shell is also the first pressure. The suction pressure in the outlet pipe in the second working condition is a second pressure, the second pressure is greater than the first pressure, and the pressure in the variable volume cavity is a third pressure. In the first working condition, the pressure difference between the third pressure and the first pressure can drive the piston assembly to open the first oil return hole, and the liquid refrigerant can be discharged from the first oil return hole. In the second working condition, the pressure difference between the second pressure and the third pressure can drive the piston assembly to close the first oil return hole, and the liquid refrigerant cannot be discharged from the first oil return hole.

[0011] In some embodiments,

[0012] The piston assembly comprises a fixed part and a moving part, the fixed part and the moving part form the variable volume cavity therebetween, the fixed part is fixed, and the moving part can move towards or away from the fixed part. When the moving part moves towards the fixed part, the volume of the variable volume cavity gradually decreases, and when the moving part moves away from the fixed part, the volume of the variable volume cavity gradually increases. In the first working condition, the moving part can move to be not opposite to the first oil return hole, thereby opening the first oil return hole, and in the second working condition, the moving part can move to be opposite to the first oil return hole, thereby closing the first oil return hole.

[0013] In some embodiments,

[0014] When switching from the second working condition to the first working condition, the pressure difference between the third pressure and the first pressure drives the moving part to move away from the fixed part until the moving part is not opposite to the first oil return hole. When switching from the first working condition to the second working condition, the pressure difference between the second pressure and the third pressure drives the moving part to move towards the fixed part until the moving part is opposite to the first oil return hole.

[0015] In some embodiments,

[0016] The fixed part and the first oil return hole are arranged in radial opposition, and a first gap passage is formed between the fixed part and the outlet pipe. One side plate of the moving part can move into the first gap passage to close the first oil return hole.

[0017] In some embodiments,

[0018] The fixed member is a ring structure, the fixed member of the ring structure is sleeved on the outer periphery of the outlet pipe, and the radial inner periphery wall of the fixed member is spaced from the outer wall of the outlet pipe to form the first gap channel, and the radial inner periphery wall of the fixed member is opposite to the first oil return hole in the radial direction; the moving member is also a ring structure, the moving member of the ring structure is sleeved on the outer periphery of the outlet pipe, and the radial inner periphery wall of the moving member is attached to the outer periphery wall of the outlet pipe, so that the radial inner side plate of the moving member can be slid along the outer periphery wall of the outlet pipe into the first gap channel to close the first oil return hole.

[0019] In some embodiments,

[0020] In the longitudinal section, the fixed member includes a first radial inner side plate, a first flat plate and a first radial outer side plate, the first radial inner side plate is connected to the radial inner side end of the first flat plate and extends towards a first axial direction, the first radial outer side plate is connected to the radial outer side end of the first flat plate and also extends towards the first axial direction, so that the first radial inner side plate, the first flat plate and the first radial outer side plate form a first concave structure with an opening facing the first axial direction;

[0021] The moving member includes a second radial inner side plate, a second flat plate and a second radial outer side plate, the second radial inner side plate is connected to the radial inner side end of the second flat plate and extends towards a second axial direction, the second radial outer side plate is connected to the radial outer side end of the second flat plate and also extends towards the second axial direction, the second axial direction is opposite to the first axial direction, so that the second radial inner side plate, the second flat plate and the second radial outer side plate form a second concave structure with an opening facing the second axial direction;

[0022] The openings of the first concave structure and the second concave structure are connected to form the variable volume cavity between the two openings, the radial inner wall of the second radial inner side plate is attached to the outer periphery wall of the outlet pipe, and the radial outer wall of the second radial inner side plate is attached to the radial inner wall of the first radial inner side plate, so that the second radial inner side plate can be slid into the first gap channel.

[0023] In some embodiments,

[0024] The radial inner wall of the second radial outer side plate is attached to the radial outer wall of the first radial outer side plate, so that the second radial outer side plate can be slid along the radial outer wall of the first radial outer side plate;

[0025] The first radial inner plate, the first flat plate and the first radial outer plate are annular structures, so that the first concave structure is an annular cavity; the second radial inner plate, the second flat plate and the second radial outer plate are also annular structures, so that the second concave structure is also an annular cavity, so that the variable volume cavity forms a variable volume annular cavity.

[0026] In some embodiments,

[0027] The housing further comprises a partition plate, which divides the internal cavity of the housing into a first cavity and a second cavity, the first cavity being in communication with the second cavity, the piston assembly being arranged in the second cavity and connected to the partition plate, and the piston assembly being arranged opposite to the first oil return hole.

[0028] In some embodiments,

[0029] The outer peripheral wall of the partition plate is fixed to the housing, and the inner peripheral wall of the partition plate and the outer peripheral wall of the outlet pipe are spaced apart to form a second gap channel, the first cavity and the second cavity being in communication through the second gap channel, the fixed part being fixed to the partition plate, and the movable part being in sliding connection with the fixed part and being capable of sliding relative to the fixed part.

[0030] In some embodiments,

[0031] The first cavity is an upper cavity, and the second cavity is a lower cavity, the upper end of the fixed part being connected to the partition plate, and the first oil return hole being arranged opposite to the lower cavity; the outlet pipe further comprises a second oil return hole, the second oil return hole being arranged opposite to the upper cavity; the fixed part is a cylinder, the movable part is a piston, and the piston is connected to the lower end of the cylinder.

[0032] The application further provides a compressor assembly comprising the aforementioned liquid accumulator, and further comprising a compressor, the liquid accumulator being arranged in communication with the suction end of the compressor.

[0033] The application further provides an air conditioner comprising the aforementioned compressor assembly.

[0034] The liquid accumulator, the compressor assembly and the air conditioner provided by the application have the following beneficial effects:

[0035] The application sets a piston assembly inside the shell of the liquid accumulator, sets a variable cavity inside the piston assembly, and controls whether the first oil return hole is opened according to the pressure difference between the inside and outside of the variable cavity caused by different working conditions. In the first working condition (especially low-temperature heating, maximum refrigeration, etc.), the first pressure in the outlet pipe is relatively low, and a large amount of refrigerant is required to enter the system. Therefore, the third pressure inside the piston assembly and the first pressure inside the shell form a pressure difference, which drives the piston assembly to open the first oil return hole in the first working condition, so that more liquid refrigerant enters the system for circulation, meeting the requirement that the amount of refrigerant stored at the bottom of the distributor is small and the amount of refrigerant entering the system for circulation is large in the low-temperature heating condition and the maximum refrigeration condition. In the second working condition (especially rated refrigeration and low-temperature intermediate refrigeration, etc.), the second pressure in the outlet pipe is relatively high, and a small amount of refrigerant is required to enter the system. Therefore, the third pressure inside the piston assembly and the second pressure inside the shell form a pressure difference, which drives the piston assembly to close the first oil return hole in the second working condition, so that less liquid refrigerant enters the system for circulation, meeting the requirement that the amount of refrigerant stored at the bottom of the distributor is large and the amount of refrigerant entering the system for circulation is small in the rated refrigeration condition and the low-temperature intermediate refrigeration condition. Therefore, the circulation amount of refrigerant entering the system in the first working condition (the suction pressure is low, belonging to the low-temperature heating condition and the maximum refrigeration condition, and the liquid refrigerant density is large) is greater than the circulation amount of refrigerant entering the system in the second working condition (the suction pressure is high, belonging to the low-temperature intermediate refrigeration condition and the rated refrigeration condition, etc.). The system refrigerant circulation amount is effectively adapted to different working conditions, the energy efficiency matching effect is good, the contradiction between the different height requirements of the oil return hole of the distributor in different working conditions of the air conditioner is solved, the amount of refrigerant stored at the bottom of the distributor is small in the low-temperature heating condition and the maximum refrigeration condition, and the amount of refrigerant stored at the bottom of the distributor is large in the rated refrigeration condition and the low-temperature intermediate refrigeration condition, and the energy efficiency of the air conditioning system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a front view of the prior art distributor;

[0037] Figure 2 is a front view of the distributor of the application in the first working condition;

[0038] Figure 3 is a front view of the distributor of the application in the second working condition; Figure 2

[0039] Figure 4 is a front view of the distributor of the application in the second working condition;

[0040] Figure 5 is a front view of the distributor of the application in the second working condition; Figure 4 ​Figure 2 is a partial enlarged view of part B of figure 1.

[0041] Reference signs are indicated as:

[0042] 1, housing; 2, inlet pipe; 3, outlet pipe; 4, piston assembly; 5, first oil return hole; 6, variable volume chamber; 7, fixed member; 8, moving member; 9, first gap passage; 10, first radially inner plate; 11, first flat plate; 12, first radially outer plate; 13, second radially inner plate; 14, second flat plate; 15, second radially outer plate; 16, first concave structure; 17, second concave structure; 18, partition plate; 19, first cavity; 20, second cavity; 21, second gap passage; 22, second oil return hole. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0044] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a reference to the presence of a feature, step, operation, device, component, and / or combinations thereof.

[0045] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth herein are not limiting. It should be understood that the various parts shown in the drawings are not necessarily drawn to scale in proportion. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so that once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0046] In the description of the present application, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0047] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0048] In addition, it needs to be pointed out that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as a limitation on the scope of protection of the present application.

[0049] As Figures 2 to 5 shown, the present application provides a liquid accumulator, which comprises:

[0050] A housing 1, an inlet pipe 2, an outlet pipe 3 and a piston assembly 4, the inlet pipe 2 communicates with the inside of the housing 1, the outlet pipe 3 is arranged from one end of the housing 1 into the inside of the housing 1,

[0051] The outlet pipe 3 is provided with a first oil return hole 5, the first oil return hole 5 is located in the housing 1, the first oil return hole 5 can communicate the inside of the housing 1 with the inside of the outlet pipe 3, the piston assembly 4 has a variable cavity 6 inside; at least part of the structure of the piston assembly 4 is arranged opposite to the first oil return hole 5;

[0052] In the first working condition, the suction pressure in the outlet pipe 3 is a first pressure, the inside of the shell 1 communicates with the outlet pipe 3, and the pressure in the inside of the shell 1 is also the first pressure. In the second working condition, the suction pressure in the outlet pipe 3 is a second pressure, the second pressure is greater than the first pressure, and the pressure in the variable volume cavity 6 is a third pressure. In the first working condition, the pressure difference between the third pressure and the first pressure can drive the piston assembly 4 to open the first oil return hole 5, and the liquid refrigerant can be discharged from the first oil return hole 5. In the second working condition, the pressure difference between the second pressure and the third pressure can drive the piston assembly 4 to close the first oil return hole 5, and the liquid refrigerant cannot be discharged from the first oil return hole 5.

[0053] In the first working condition (especially low-temperature heating, maximum refrigeration, etc.), the first pressure in the outlet pipe is relatively low, and a large amount of refrigerant needs to enter the system. Therefore, the third pressure in the piston assembly is set to form a pressure difference with the first pressure in the shell. In the first working condition, the pressure difference drives the piston assembly to open the first oil return hole, so that more liquid refrigerant enters the system for circulation, meeting the requirements of low-temperature heating and maximum refrigeration. In the second working condition (especially rated refrigeration and low-temperature intermediate refrigeration, etc.), the second pressure in the outlet pipe is relatively high, and a small amount of refrigerant needs to enter the system. Therefore, the third pressure in the piston assembly is set to form a pressure difference with the second pressure in the shell. In the second working condition, the pressure difference drives the piston assembly to close the first oil return hole, so that less liquid refrigerant enters the system for circulation, meeting the requirements of rated refrigeration and low-temperature intermediate refrigeration. Therefore, the circulation amount of refrigerant in the first working condition (low-temperature heating, maximum refrigeration, etc.) is greater than that in the second working condition (low-temperature intermediate refrigeration, rated refrigeration, etc.). The system refrigerant circulation amount is effectively adapted to different working conditions, the energy efficiency matching effect is good, the contradiction between different working conditions of the air conditioner and the height requirements of the oil return hole of the distributor is solved, the amount of refrigerant stored at the bottom of the distributor in low-temperature heating and maximum refrigeration is small, the amount of refrigerant stored at the bottom of the distributor in rated refrigeration and low-temperature intermediate refrigeration is large, and the energy efficiency of the air conditioning system is improved.

[0054] In some embodiments,

[0055] The piston assembly 4 comprises a fixed part 7 and a moving part 8, the variable volume chamber 6 is formed between the fixed part 7 and the moving part 8, the fixed part 7 is fixed, the moving part 8 can move towards or away from the fixed part 7, when the moving part 8 moves towards the fixed part 7, the volume of the variable volume chamber 6 gradually decreases, when the moving part 8 moves away from the fixed part 7, the volume of the variable volume chamber 6 gradually increases; in the first working condition, the moving part 8 can move to be not opposite to the first oil return hole 5, thereby opening the first oil return hole 5, in the second working condition, the moving part 8 can move to be opposite to the first oil return hole 5, thereby closing the first oil return hole 5.

[0056] This is the preferred structure of the piston assembly of the present application, by including the fixed part and the moving part, the pressure difference between the third pressure and the first pressure in the first working condition can drive the moving part to move away from the fixed part, which can increase the volume of the variable volume chamber, thereby opening the first oil return hole, which can make more liquid refrigerant enter the system for circulation, meeting the requirement that the refrigerant amount stored at the bottom of the distributor is small and the refrigerant amount entering the system for circulation is large in the low-temperature heating working condition and the maximum refrigeration working condition; the pressure difference between the second pressure and the third pressure in the second working condition can drive the moving part to move towards the fixed part, which can reduce the volume of the variable volume chamber, thereby closing the first oil return hole, which can make less liquid refrigerant enter the system for circulation, meeting the requirement that the refrigerant amount stored at the bottom of the distributor is large and the refrigerant amount entering the system for circulation is small in the rated refrigeration and low-temperature intermediate refrigeration working condition.

[0057] In some embodiments,

[0058] When switching from the second working condition to the first working condition, the pressure difference between the third pressure and the first pressure drives the moving part 8 to move away from the fixed part 7 until the moving part 8 is not opposite to the first oil return hole 5; when switching from the first working condition to the second working condition, the pressure difference between the second pressure and the third pressure drives the moving part 8 to move towards the fixed part 7 until the moving part 8 is opposite to the first oil return hole 5.

[0059] This is the preferred form of the application when the moving part is driven by pressure difference during switching between working conditions, and the moving form, when switching from the second working condition to the first working condition, the suction pressure decreases, resulting in a decrease in the pressure inside the shell, the third pressure (plus the gravity of the moving part) in the variable volume chamber is greater than the first pressure in the shell, thereby pushing the moving part to move away from the fixed part, increasing the volume of the variable volume chamber, and opening the first oil return hole, so that the liquid refrigerant can flow out of the first oil return hole, meeting the requirement that the amount of refrigerant stored at the bottom of the distributor is small and the amount of refrigerant entering the system circulation is large during low-temperature heating and maximum refrigeration working conditions; when switching from the first working condition to the second working condition, the suction pressure increases, resulting in an increase in the pressure inside the shell, the third pressure (plus the gravity of the moving part) in the variable volume chamber is less than the second pressure in the shell, thereby pushing the moving part to move towards the fixed part, reducing the volume of the variable volume chamber, and closing the first oil return hole, so that the liquid refrigerant cannot flow out of the first oil return hole, meeting the requirement that the amount of refrigerant stored at the bottom of the distributor is large and the amount of refrigerant entering the system circulation is small during rated refrigeration and low-temperature intermediate refrigeration working conditions.

[0060] In some embodiments,

[0061] The fixed part 7 is arranged in radial opposition to the first oil return hole 5, and the first gap channel 9 is formed between the fixed part 7 and the outlet pipe 3, and one side plate of the moving part 8 can move into the first gap channel 9 to close the first oil return hole 5.

[0062] This is a further preferred structure of the fixed part and the moving part of the application, the fixed part is arranged in radial opposition to the first oil return hole and forms a first gap channel, so that one side of the moving part can move into the first gap channel to close the first oil return hole, and slide out of the first gap channel to open the first oil return hole.

[0063] In some embodiments,

[0064] The fixed part 7 is a ring structure, the ring structure of the fixed part 7 is sleeved on the outer periphery of the outlet pipe 3, and the radial inner peripheral wall of the fixed part 7 and the outer wall of the outlet pipe 3 form the first gap channel 9, and the radial inner peripheral wall of the fixed part 7 is in radial opposition to the first oil return hole 5; the moving part 8 is also a ring structure, the ring structure of the moving part 8 is sleeved on the outer periphery of the outlet pipe 3, and the radial inner peripheral wall of the moving part 8 is in contact with the outer peripheral wall of the outlet pipe 3, so that the radial inner side plate of the moving part 8 can slide along the outer peripheral wall of the outlet pipe 3 into the first gap channel 9 to close the first oil return hole 5.

[0065] This is a further preferred structure of the fixed part and the moving part of the present application, i.e. both the fixed part and the moving part are in the form of ring structure, the radial inner wall of the moving part is in contact with the outer wall of the outlet pipe to form a sliding moving structure, and the ring structure can form a larger variable volume space, providing a strong enough third pressure to achieve the effect of pushing the moving part to move.

[0066] In some embodiments,

[0067] In the longitudinal section, the fixed part 7 comprises a first radial inner side plate 10, a first flat plate 11 and a first radial outer side plate 12, the first radial inner side plate 10 is connected to the radial inner side end of the first flat plate 11 and extends towards the first axial direction, the first radial outer side plate 12 is connected to the radial outer side end of the first flat plate 11 and also extends towards the first axial direction, so that the first radial inner side plate 10, the first flat plate 11 and the first radial outer side plate 12 form a first concave structure 16 with the opening facing the first axial direction;

[0068] The moving part 8 comprises a second radial inner side plate 13, a second flat plate 14 and a second radial outer side plate 15, the second radial inner side plate 13 is connected to the radial inner side end of the second flat plate 14 and extends towards the second axial direction, the second radial outer side plate 15 is connected to the radial outer side end of the second flat plate 14 and also extends towards the second axial direction, the second axial direction is opposite to the first axial direction, so that the second radial inner side plate 13, the second flat plate 14 and the second radial outer side plate 15 form a second concave structure 17 with the opening facing the second axial direction;

[0069] The opening of the first concave structure 16 and the second concave structure 17 are in contact to form the variable volume cavity 6 between the two openings, the radial inner wall of the second radial inner side plate 13 is in contact with the outer wall of the outlet pipe 3, and the radial outer wall of the second radial inner side plate 13 is in contact with the radial inner wall of the first radial inner side plate 10, so that the second radial inner side plate 13 can slide into the first gap channel 9.

[0070] This is a further preferred structure of the fixed part and the moving part of the present application, i.e. both the fixed part and the moving part are in the form of ring structure, the radial inner wall of the moving part is in contact with the outer wall of the outlet pipe to form a sliding moving structure, and the ring structure can form a larger variable volume space, providing a strong enough third pressure to achieve the effect of pushing the moving part to move.

[0071] In some embodiments,

[0072] The radial inner wall of the second radial outer plate 15 is arranged in abutment with the radial outer wall of the first radial outer plate 12, so that the second radial outer plate 15 can slide in abutment with the radial outer wall of the first radial outer plate 12;

[0073] The first radial inner plate 10, the first flat plate 11 and the first radial outer plate 12 are all annular structures, so that the first concave structure 16 is an annular cavity, and the second radial inner plate 13, the second flat plate 14 and the second radial outer plate 15 are also all annular structures, so that the second concave structure 17 is also an annular cavity, so that the variable volume cavity 6 forms an annular cavity with variable volume.

[0074] This is a further preferred matching form between the moving part and the fixed part of the application, that is, the second radial outer plate is located at the outer periphery of the first radial outer plate, and the second radial inner plate is located at the inner periphery of the first radial inner plate, so that the structure of the moving part wraps the structure of the fixed part inside, and the specific structures of the above-mentioned fixed part and moving part are annular structures, so that the variable volume cavity also forms an annular cavity, which can effectively increase the volume of the variable volume cavity, so as to provide a third pressure strong enough to achieve the effect of pushing the moving part to move.

[0075] In some embodiments,

[0076] Further comprising a partition plate 18, the partition plate 18 divides the internal cavity of the shell 1 into a first cavity 19 and a second cavity 20, the first cavity 19 communicates with the second cavity 20, the piston assembly 4 is arranged in the second cavity 20 and connected with the partition plate 18, and the piston assembly 4 is arranged opposite to the first oil return hole 5.

[0077] The application can separate the internal cavity of the shell into a first cavity and a second cavity through the structure of the partition plate, the first oil return hole is arranged in the second cavity, and the piston assembly is also arranged in the second cavity to be opposite to the first oil return hole, so as to achieve the purpose of closing or opening the first oil return hole, adapt to different system refrigerant circulation amounts according to different working conditions, and have good energy efficiency matching effect, solve the contradictory problem that different working conditions of the air conditioner have different height requirements for the oil return hole of the distributor, can simultaneously ensure that the refrigerant amount stored at the bottom of the distributor is small in the low-temperature heating working condition and the maximum refrigerating working condition, the refrigerant amount stored at the bottom of the distributor is large in the rated refrigerating and low-temperature intermediate refrigerating working condition, and improve the energy efficiency of the air conditioning system.

[0078] In some embodiments,

[0079] The outer peripheral wall of the partition plate 18 is fixed to the shell 1, the inner peripheral wall of the partition plate 18 is spaced apart from the outer peripheral wall of the outlet pipe 3 to form a second gap channel 21, the first cavity 19 and the second cavity 20 can communicate through the second gap channel 21, the fixing part 7 is fixed to the partition plate 18, and the moving part 8 is in sliding connection with the fixing part 7, and the moving part 8 can slide relative to the fixing part 7.

[0080] This is a further preferred structure of the partition plate, the fixing part and the moving part of the application, that is, the partition plate is fixed to the shell, the second gap channel is formed between the outer peripheral wall of the outlet pipe and the partition plate to enable the first and second cavities to communicate, the fixing part is fixed to the partition plate to ensure the fixation of the fixing part, and the moving part is in sliding connection with the fixing part, so that the moving part can move to cover or not cover the first oil return hole according to the pressure of the cavity in the shell generated by different working conditions, thereby playing a role of adapting different system refrigerant circulation amounts according to different working conditions, while ensuring that the amount of refrigerant stored in the bottom of the distributor is small in the low-temperature heating working condition and the maximum refrigerating working condition, and the amount of refrigerant stored in the bottom of the distributor is large in the rated refrigerating and low-temperature intermediate refrigerating working conditions, thereby improving the energy efficiency of the air conditioning system.

[0081] In some embodiments,

[0082] The first cavity 19 is an upper cavity, the second cavity 20 is a lower cavity, the upper end of the fixing part 7 is connected to the partition plate 18, and the first oil return hole 5 is arranged at a position opposite to the lower cavity; the outlet pipe 3 is further provided with a second oil return hole 22, and the second oil return hole 22 is arranged at a position opposite to the upper cavity; the fixing part 7 is a cylinder, the moving part 8 is a piston, and the piston is connected to the lower end of the cylinder.

[0083] This is a further preferred structure of the liquid accumulator of the application, that is, the liquid accumulator is placed upside down, the first cavity above the partition plate is an upper cavity, the second cavity below the partition plate is a lower cavity, the fixing part is connected to the lower end of the partition plate, and the moving part is in sliding connection with the lower end of the fixing part; the fixing part is preferably a stationary cylinder, and the moving part is preferably a movable piston; by further arranging the second oil return hole, the second oil return hole is higher than the first oil return hole, the amount of refrigerant discharged in the second working condition can be reduced, the system refrigerant circulation amount in the second working condition is reduced relative to the first working condition, the liquid refrigerant inside the shell can be discharged only when the second oil return hole is reached, different system refrigerant circulation amounts are adapted according to different working conditions, the energy efficiency matching effect is good, the contradictory problem that the height of the oil return hole of the distributor is required to be different in different working conditions of the air conditioner is solved, and the energy efficiency of the air conditioning system is improved.

[0084] The application further provides a compressor assembly comprising the aforementioned liquid accumulator, and further comprising a compressor, and the liquid accumulator is arranged in communication at the suction end of the compressor.

[0085] The compressor of the present invention has a liquid distributor, characterized in that its bottom is provided with a movable piston and a variable volume chamber therebetween;

[0086] Its characteristic is that the variable volume cavity has a certain pressure P (third pressure), and the piston component slides freely according to the different intake pressure, thereby realizing the opening and closing of the first oil return hole at the bottom.

[0087] The compressor uses refrigerant A. When it is matched with the system, the operating conditions are divided into Class B (second operating condition) and Class C (first operating condition). The characteristic is that the suction pressure P1 > P in Class B (i.e., the second pressure is greater than the third pressure), and the suction pressure P1 < P in Class C (i.e., the first pressure is less than the third pressure).

[0088] like Figures 4-5 As shown, under Class B operating conditions, the suction pressure is higher, i.e., P1 > P (i.e., the second pressure is greater than the third pressure under the second operating condition). The internal pressure of the distributor is greater than the pressure of the variable volume chamber, the piston moves upward, the first oil return hole is closed, and more liquid refrigerant can be stored in the distributor and cannot enter the compressor. This meets the requirements of Class B operating conditions for less refrigerant charge and circulation, and avoids a large amount of liquid refrigerant entering the compressor, which would affect the system energy efficiency.

[0089] like Figures 2-3 As shown, under Class C operating conditions, the suction pressure is low, i.e., P1 < P (i.e., the first pressure under the first operating condition is less than the third pressure). The internal pressure of the distributor is less than the pressure of the variable cavity. The piston slides downward due to the influence of the cavity, the first oil return hole opens, and the liquid refrigerant can enter the compressor, meeting the Class C operating conditions' requirements for large refrigerant charge and circulation volume, and giving full play to its capacity and energy efficiency.

[0090] The variable volume chamber 6 of the present invention is sealed, wherein its pressure P can be controlled by a sealed metered refrigerant.

[0091] In addition to the first oil return hole at the bottom, the distributor of this invention also has a second oil return hole located above the first oil return hole at a position higher than the bottom. When the air conditioner is in low-temperature intermediate cooling or rated cooling mode for a long time, the first oil return hole at the bottom of the distributor is in a closed state for a long time, causing oil to accumulate in the distributor and resulting in oil shortage in the compressor. The design of the second oil return hole is to prevent excessive oil accumulation inside the distributor.

[0092] The invention achieves the following effects: in low-temperature heating and maximum cooling conditions, the amount of residual liquid inside the distributor is small, the capacity is well utilized, and the system requirements are met; in rated cooling and low-temperature intermediate cooling conditions, the amount of refrigerant stored inside the distributor is large, and the energy efficiency matching effect is good.

[0093] The present invention can solve the following technical problem: the contradictory problem of different requirements for the height of the oil return hole of the distributor under different air conditioning operating conditions.

[0094] The low-temperature heating and maximum refrigeration working condition of the application requires that the amount of refrigerant stored at the bottom of the distributor is small, and the amount of refrigerant participating in the circulation is sufficient to better exert the system capacity and meet the maximum refrigeration and low-temperature heating capacity requirements. In terms of refrigeration oil, more refrigeration oil is also required in the compressor, which also requires less refrigeration oil storage in the distributor. If the oil return hole is opened too low, the amount of liquid refrigerant circulating in the system is too large, which seriously affects the performance of the compressor in the rated refrigeration and low-temperature intermediate refrigeration working conditions.

[0095] The bottom of the distributor is provided with a first oil return hole, and the bottom first oil return hole has two states of opening and closing. In the maximum refrigeration and low-temperature heating working condition, the system refrigerant circulation amount requirement is large, and the pressure difference inside and outside the pipe is large, so the bottom first oil return hole position piston assembly is opened, and the bottom liquid can enter the compressor from the first oil return hole.

[0096] The air conditioning system requires a large amount of system refrigerant circulation in the maximum refrigeration and low-temperature heating working condition, that is, it requires less liquid storage in the distributor. The compressor and air conditioner of the application can realize less liquid storage in the distributor to meet the demand of large system refrigerant circulation.

[0097] The air conditioning system requires less liquid storage in the distributor in the low-temperature intermediate refrigeration, rated refrigeration and other working conditions, otherwise it will seriously affect the system energy efficiency, which requires more liquid storage in the distributor. The compressor and air conditioner of the application can realize more liquid storage in the distributor to meet the system excessive liquid circulation.

[0098] The application also provides an air conditioner comprising the aforementioned compressor assembly.

[0099] The above description is only the preferred embodiment of the application and is not intended to limit the application. Any modification, equivalent replacement and improvement within the spirit and principle of the application should be included in the protection scope of the application. The above description is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the application, a number of improvements and modifications can be made, which should be considered as the protection scope of the application.

Claims

1. A reservoir characterized by: The application relates to a liquid accumulator, which comprises a shell (1), an inlet pipe (2), an outlet pipe (3) and a piston assembly (4), the inlet pipe (2) being communicated with the inside of the shell (1), the outlet pipe (3) being arranged in the shell (1) and communicated with the inside of the shell (1), a first oil return hole (5) being arranged on the outlet pipe (3) and located in the shell (1), the first oil return hole (5) being communicated with the inside of the shell (1) and the inside of the outlet pipe (3), the piston assembly (4) having a variable volume cavity (6) in the inside, and at least part of the structure of the piston assembly (4) being arranged opposite to the first oil return hole (5). In the first working condition, the suction pressure in the outlet pipe (3) is the first pressure, the inside of the shell (1) is communicated with the outlet pipe (3), and the pressure in the inside of the shell (1) is also the first pressure; in the second working condition, the suction pressure in the outlet pipe (3) is the second pressure, the second pressure is greater than the first pressure, the pressure in the variable volume cavity (6) is the third pressure, the pressure difference between the third pressure and the first pressure in the first working condition can drive the piston assembly (4) to open the first oil return hole (5), and the liquid refrigerant can be discharged from the first oil return hole (5); in the second working condition, the pressure difference between the second pressure and the third pressure can drive the piston assembly (4) to close the first oil return hole (5), and the liquid refrigerant cannot be discharged from the first oil return hole (5).

2. The liquid accumulator according to claim 1, wherein the piston assembly (4) comprises a fixed part (7) and a moving part (8), the fixed part (7) and the moving part (8) form the variable volume cavity (6), the fixed part (7) is fixed, the moving part (8) can move towards or away from the fixed part (7), when the moving part (8) moves towards the fixed part (7), the volume of the variable volume cavity (6) gradually decreases, when the moving part (8) moves away from the fixed part (7), the volume of the variable volume cavity (6) gradually increases; in the first working condition, the moving part (8) can move to be not opposite to the first oil return hole (5), thereby opening the first oil return hole (5), in the second working condition, the moving part (8) can move to be opposite to the first oil return hole (5), thereby closing the first oil return hole (5).

3. The liquid accumulator according to claim 2, wherein when the second working condition is switched to the first working condition, the pressure difference between the third pressure and the first pressure drives the moving part (8) to move away from the fixed part (7) until the moving part (8) is not opposite to the first oil return hole (5); when the first working condition is switched to the second working condition, the pressure difference between the second pressure and the third pressure drives the moving part (8) to move towards the fixed part (7) until the moving part (8) is opposite to the first oil return hole (5). ​ ​ ​ ​ 4. The liquid accumulator of claim 2, wherein: the fixed member (7) is disposed diametrically opposite to the first oil return hole (5), and a first gap passage (9) is formed between the fixed member (7) and the outlet pipe (3), and one side plate of the moving member (8) is movable into the first gap passage (9) to close the first oil return hole (5).

5. The liquid accumulator of claim 4, wherein: the fixed member (7) is of a ring structure, and the ring structure of the fixed member (7) is sleeved on the outer periphery of the outlet pipe (3), and a radial inner peripheral wall of the fixed member (7) and an outer wall of the outlet pipe (3) are spaced apart to form the first gap passage (9), and the radial inner peripheral wall of the fixed member (7) is diametrically opposite to the first oil return hole (5); the moving member (8) is also of a ring structure, and the ring structure of the moving member (8) is sleeved on the outer periphery of the outlet pipe (3), and a radial inner peripheral wall of the moving member (8) is in abutment with the outer peripheral wall of the outlet pipe (3) so that a radial inner side plate of the moving member (8) is slidable along the outer peripheral wall of the outlet pipe (3) into the first gap passage (9) to close the first oil return hole (5).

6. The liquid accumulator of claim 5, wherein: in a longitudinal cross section, the fixed member (7) comprises a first radial inner side plate (10), a first flat plate (11), and a first radial outer side plate (12), the first radial inner side plate (10) is connected to a radial inner side end of the first flat plate (11) and extends toward a first axial direction, and the first radial outer side plate (12) is connected to a radial outer side end of the first flat plate (11) and also extends toward the first axial direction, so that the first radial inner side plate (10), the first flat plate (11), and the first radial outer side plate (12) form a first concave structure (16) with an opening facing the first axial direction; the moving member (8) comprises a second radial inner side plate (13), a second flat plate (14), and a second radial outer side plate (15), the second radial inner side plate (13) is connected to a radial inner side end of the second flat plate (14) and extends toward a second axial direction, and the second radial outer side plate (15) is connected to a radial outer side end of the second flat plate (14) and also extends toward the second axial direction, and the second axial direction is opposite to the first axial direction, so that the second radial inner side plate (13), the second flat plate (14), and the second radial outer side plate (15) form a second concave structure (17) with an opening facing the second axial direction; the first concave structure (16) and the second concave structure (17) are in abutment at the openings thereof to form the variable volume cavity (6) between the two openings, a radial inner wall of the second radial inner side plate (13) is in abutment with the outer peripheral wall of the outlet pipe (3), and a radial outer wall of the second radial inner side plate (13) is in abutment with the radial inner wall of the first radial inner side plate (10), so that the second radial inner side plate (13) is slidable into the first gap passage (9).

7. The liquid accumulator of claim 6, wherein: a radially inner wall of the second radial outer plate (15) is arranged in abutment with a radially outer wall of the first radial outer plate (12) so as to enable sliding of the second radial outer plate (15) in abutment with the radially outer wall of the first radial outer plate (12); the first radial inner plate (10), the first flat plate (11) and the first radial outer plate (12) are all annular structures, so that the first concave structure (16) is an annular cavity, and the second radial inner plate (13), the second flat plate (14) and the second radial outer plate (15) are also all annular structures, so that the second concave structure (17) is also an annular cavity, so as to form a variable-volume annular cavity for the variable-volume cavity (6).

8. The liquid accumulator of any one of claims 2-7, wherein: a partition plate (18) is further included, the partition plate (18) divides the internal cavity of the shell (1) into a first cavity (19) and a second cavity (20), the first cavity (19) is in communication with the second cavity (20), the piston assembly (4) is arranged in the second cavity (20) and connected with the partition plate (18), and the piston assembly (4) is arranged opposite to the first oil return hole (5).

9. The liquid accumulator of claim 8, wherein: an outer peripheral wall of the partition plate (18) is fixedly connected with the shell (1), a second gap passage (21) is formed between an inner peripheral wall of the partition plate (18) and an outer peripheral wall of the outlet pipe (3), the first cavity (19) and the second cavity (20) can communicate through the second gap passage (21), the fixed member (7) is fixedly connected with the partition plate (18), the moving member (8) is slidingly connected with the fixed member (7), and the moving member (8) can slide relative to the fixed member (7).

10. The liquid accumulator of claim 8, wherein: the first cavity (19) is an upper cavity, the second cavity (20) is a lower cavity, an upper end of the fixed member (7) is connected with the partition plate (18), the first oil return hole (5) is arranged at a position opposite to the lower cavity, a second oil return hole (22) is further arranged on the outlet pipe (3), the second oil return hole (22) is arranged at a position opposite to the upper cavity, the fixed member (7) is a cylinder, the moving member (8) is a piston, and the piston is connected to a lower end of the cylinder.

11. A compressor assembly characterized by: The liquid accumulator of any one of claims 1-10 is further included, and a compressor is further included, and the liquid accumulator is arranged in communication at a suction end of the compressor.

12. An air conditioner characterized by comprising: The compressor assembly of claim 11 is included.

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