Oil level balancing device and compressor

Abstract

The application discloses an oil level balancing device and a compressor and belongs to the technical field of compressors. The device comprises an oil box, a lifting platform and a driving mechanism. The oil box is provided with an oil port communicating with the inner cavity of the shell. The lifting platform is arranged in the oil box, and an oil storage cavity is formed between the upper surface of the lifting platform and the oil port. The driving mechanism utilizes the natural pressure difference between the internal pressure of the shell and the internal pressure of the distributor as a power source to drive the lifting platform to automatically lift. When the compressor operates at high speed, the pressure difference increases, and the lifting platform rises to supplement the oil in the oil storage cavity into the shell. When the compressor operates at low speed, the pressure difference decreases, and the lifting platform descends to store the excess oil in the shell into the oil storage cavity. The application realizes dynamic oil level balance by adopting a pure mechanical structure, does not need additional electric control elements and external power, has a simple and reliable structure, effectively reduces energy consumption, realizes the energy-saving and environment-friendly effect, and improves the operation stability of the compressor.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and more specifically, to an oil level balancing device and a compressor. Background Technology

[0002] Compressors are widely used in refrigeration equipment such as air conditioners and refrigerators. A certain amount of refrigeration oil is usually stored at the bottom of the compressor casing to lubricate the pump body, bearings and other moving parts inside the compressor.

[0003] When the compressor runs at different speeds, the level of the refrigeration oil in the casing will fluctuate significantly: when running at high speed, the refrigeration oil is easily carried out by the refrigerant gas, resulting in a decrease in the oil level and insufficient lubrication or even wear of moving parts; when running at low speed or when stopped, a large amount of refrigerant dissolves into the refrigeration oil, causing an abnormal increase in the oil level, which can easily lead to compressor failure. Summary of the Invention

[0004] This application provides an oil level balancing device and a compressor to at least solve the problem of oil level fluctuations under different application environments.

[0005] Specifically, the present invention provides an oil level balancing device for use with a compressor housing and a distributor. The oil level balancing device includes: an oil box for mounting on the outer wall of the housing, the oil box having an oil port communicating with the inner cavity of the oil box and the inner cavity of the housing; a lifting platform movably disposed within the inner cavity of the oil box, the upper surface of the lifting platform forming an oil storage cavity between the oil port and the lifting platform; and a drive mechanism acting on the lifting platform, the drive mechanism having a first pressure inlet end and a second pressure inlet end, the first pressure inlet end being for communicating with the interior of the housing to introduce internal pressure from the housing, the second pressure inlet end being... The pressure inlet is used to communicate with the inside of the distributor to introduce the internal pressure of the distributor; wherein, the drive mechanism is configured to use the pressure difference between the internal pressure of the housing and the internal pressure of the distributor as a power source, and is configured to: when the compressor operates at high speed, causing the pressure difference to increase, drive the lifting platform to rise, thereby reducing the volume of the oil storage chamber, so that the oil in the oil storage chamber is replenished into the housing through the oil port; when the compressor operates at low speed, causing the pressure difference to decrease, drive the lifting platform to fall, thereby increasing the volume of the oil storage chamber, so that the oil in the housing flows into the oil storage chamber for storage through the oil port.

[0006] According to one embodiment of the present invention, the driving mechanism includes a pneumatic assembly and a lifting assembly, the pneumatic assembly and the lifting assembly being disposed within the oil box and located in the lower space below the lifting platform; the pneumatic assembly includes a cylinder, a piston, and an elastic element, the piston being movably disposed within the cylinder and dividing the inner cavity of the cylinder into a first pressure chamber and a second pressure chamber, one end of the cylinder having a first pressure inlet end communicating with the first pressure chamber and the interior of the housing, and the other end of the cylinder having a second pressure inlet end communicating with the second pressure chamber and the interior of the distributor; the lifting assembly and the piston The system is connected by a transmission mechanism, and the lifting assembly acts on the lifting platform. The elastic element acts on the piston. When the compressor operates at high speed, causing an increase in the pressure difference between the internal pressure of the housing and the internal pressure of the distributor, this pressure difference drives the piston to overcome the elastic force of the elastic element and move along a first direction, thereby raising the lifting platform via the lifting assembly. When the compressor operates at low speed, causing a decrease in the pressure difference between the internal pressure of the housing and the internal pressure of the distributor, the elastic element drives the piston to move along a second direction opposite to the first direction, thereby lowering the lifting platform via the lifting assembly.

[0007] According to one embodiment of the present invention, the piston includes a plug body and a rod body. The plug body is movably disposed within the cylinder body. One end of the rod body is connected to the plug body, and the other end extends out of the cylinder body from the first pressure inlet end and is connected to an elastic member outside the cylinder body. The portion of the rod body disposed outside the cylinder body is drively connected to the lifting assembly.

[0008] According to one embodiment of the present invention, the lifting assembly includes: a base disposed within the oil box; a first bracket and a second bracket, the first bracket and the second bracket being cross-hinged, the upper end of the first bracket being slidably connected to the lifting platform and the lower end being connected to the base, the upper end of the second bracket being connected to the lifting platform and the lower end being slidably connected to the base; wherein, the portion of the rod extending out of the cylinder is drively connected to the second bracket, so that the lower end of the second bracket is driven to slide relative to the base by the extension and retraction of the rod, thereby changing the included angle between the first bracket and the second bracket, thereby driving the lifting platform to rise or fall.

[0009] According to one embodiment of the present invention, the oil level balancing device further includes: a back pressure pipe, one end of which is connected to the interior of the housing and the other end of which is connected to the lower space in the oil box; and a conduit, one end of which is connected to the interior of the distributor and the other end of which is connected to the second pressure inlet of the cylinder; wherein the first pressure inlet of the cylinder is connected to the lower space to introduce the pressure inside the housing into the first pressure chamber via the back pressure pipe and the lower space, and the conduit is used to directly introduce the pressure inside the distributor into the second pressure chamber.

[0010] According to one embodiment of the present invention, the top of the oil box is provided with a first clearance hole, the lifting platform is provided with a second clearance hole corresponding to the first clearance hole, the air outlet of the back pressure pipe passes through the first clearance hole and the second clearance hole in sequence and extends into the lower space, and a sliding seal is formed between the back pressure pipe and the second clearance hole.

[0011] According to one embodiment of the present invention, the back pressure pipe includes an upper port, a lower port one, and a lower port two. The upper port is used to connect to the space inside the housing located above the motor. The lower port one is used to connect to the space inside the housing located below the motor. The lower port two is used to connect to the lower space, so that the internal pressure of the housing can be introduced into the back pressure pipe through the upper port and / or the lower port one, and enter the lower space of the oil box through the lower port two.

[0012] According to one embodiment of the present invention, the oil level balancing device further includes a pressure relief mechanism, which includes a floating element and a valve assembly linked to the floating element. The floating element is disposed in the oil storage chamber and can float with the liquid level. The valve assembly is configured to: maintain the pressure passage between the second pressure inlet and the inside of the distributor when the liquid level in the oil storage chamber is not higher than a preset position; when the liquid level in the oil storage chamber is higher than the preset position, the floating element drives the valve assembly to close the pressure passage and balance the pressure at both ends of the piston. After the pressure at both ends of the piston is balanced, the elastic element drives the piston to move along the second direction through its own elastic force to drive the lifting platform to descend.

[0013] According to one embodiment of the present invention, the valve assembly includes a connecting rod and a sliding member. The sliding member is slidably disposed in a second pressure chamber within the cylinder body. The upper end of the connecting rod is connected to the floating member, and the lower end passes through the lifting platform and the outer wall of the cylinder body and is connected to the sliding member. The cylinder body is also provided with a pressure relief port communicating with the second pressure chamber. When the oil level in the oil storage chamber is not higher than the oil port position, the floating member is not floating on the oil surface, and the sliding member is in a first position. In the first position, the sliding member connects the second pressure chamber with the... The pressure passage between the liquid separator and the liquid distributor is closed, and the pressure relief port is blocked. When the oil level in the oil storage chamber is higher than the oil port, the floating member floats above the oil surface and, as the oil level rises, drives the sliding member to rise to the second position via the connecting rod. In the second position, the sliding member closes the pressure passage between the second pressure chamber and the liquid distributor and opens the pressure relief port, so that the first pressure chamber and the second pressure chamber are connected to the lower space through the first pressure inlet and the pressure relief port, respectively, so that the pressure at both ends of the piston remains balanced.

[0014] According to one embodiment of the present invention, the second pressure chamber includes a first chamber segment with a large diameter and a second chamber segment with a small diameter. The first chamber segment communicates with the second chamber segment, and the inlet of the second chamber segment forms a second pressure inlet end that communicates with the interior of the distributor. The pressure relief hole communicates with the first chamber segment. The sliding member is disposed in the first chamber segment, and a communicating channel is formed through the sliding member. When the sliding member is in the first position, the communicating channel connects the first chamber segment and the second chamber segment, and the outer wall of the sliding member blocks the pressure relief hole. When the sliding member is in the second position, the outer wall of the sliding member blocks the communicating position of the first chamber segment and the second chamber segment, and releases the blockage of the pressure relief hole.

[0015] The present invention also provides a compressor including the oil level balancing device of the above embodiments.

[0016] According to one embodiment of the present invention, the compressor includes: a housing, an oil box fixedly disposed on the outer wall of the housing, and a communication port corresponding to and communicating with the oil port of the oil box on the outer wall of the housing; the lower edge of the communication port is at a first height position, and the lower end face of the upper flange inside the housing is at a second height position; wherein, the first height position is higher than the second height position.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The oil level balancing device in this application utilizes the natural pressure difference between the internal pressure of the compressor housing and the internal pressure of the distributor as a power source through a drive mechanism. It achieves purely mechanical automatic dynamic oil level balancing without the need for additional electrical control components or external power input. When the compressor operates at high speed, causing the pressure difference to increase, the drive mechanism raises the lifting platform, reducing the volume of the oil storage chamber. This allows the oil in the storage chamber to automatically replenish the compressor housing through the oil port, effectively preventing excessively low oil levels and insufficient lubrication caused by high-speed oil discharge. Conversely, when the compressor operates at low speed, causing the pressure difference to decrease, the drive mechanism lowers the lifting platform, increasing the volume of the oil storage chamber. This allows the increased oil volume in the compressor housing due to refrigerant dissolution to automatically flow into the storage chamber through the oil port, effectively preventing safety risks caused by excessively high oil levels. The oil box of this device is located on the outer wall of the compressor housing, requiring minimal modification to the compressor's structure. It achieves closed-loop self-regulation of oil storage and replenishment using the system's own pressure difference. The structure is simple and reliable, with zero additional energy consumption, significantly improving the compressor's operational stability and reliability while achieving energy-saving and environmentally friendly effects. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the oil box in an embodiment of this application; Figure 2 This is a schematic diagram of the lifting platform in the embodiments of this application; Figure 3 This is a schematic diagram of the internal structure of the oil box in an embodiment of this application. Figure 1 The lifting platform in the picture is in the raised position; Figure 4 This is a schematic diagram of the internal structure of the oil box in an embodiment of this application. Figure 2 The lifting platform in the picture is in a lowering state; Figure 5 This is a schematic diagram of the internal structure of the cylinder in an embodiment of this application; Figure 6 This is a schematic diagram of the internal structure of the cylinder after the piston is installed in an embodiment of this application; Figure 7 This is a schematic diagram of the back pressure tube in an embodiment of this application; Figure 8 This is a schematic diagram of the pressure relief structure in the embodiments of this application from a first-view perspective; Figure 9 This is a schematic diagram of the pressure relief structure in the embodiments of this application from a second perspective; Figure 10 This is a schematic diagram of the structure after the pressure relief structure and cylinder block are fitted together in the embodiments of this application. Figure 1 The floating component in the picture is not in a floating state; Figure 11 This is a schematic diagram of the structure after the pressure relief structure and cylinder block are fitted together in the embodiments of this application. Figure 2 The floating component in the picture is in a floating state; Figure 12 This is a schematic diagram of the internal structure of the compressor in an embodiment of this application; Figure 13 This is a schematic diagram of the internal structure of the compressor and oil level balancing device after assembly in an embodiment of this application.

[0019] in: 10. Oil box; 101. Oil port; 102. Oil storage chamber; 103. Lower space; 104. First clearance hole; 20. Lifting platform; 201. Second clearance hole; 30. Cylinder block; 301. First pressure chamber; 3011. First pressure inlet end; 302. Second pressure chamber; 3021. Second pressure inlet end; 303. Pressure relief port; 40. Piston; 401. Plug body; 402. Rod body; 50. Elastic components; 60. Base; 701. First support; 702. Second support; 801, Back pressure tube; 8011, Upper port; 8012, Lower port one; 8013, Lower port two; 802, Conduit; 901. Floating component; 902. Connecting rod; 903. Sliding component; 9031. Connecting channel; 100. Housing; 1001. Connecting port; 200. Dispenser; 300. Electric motor. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0021] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise; “multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0022] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0023] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0024] like Figures 1-13 As shown, the first aspect of this application provides an oil level balancing device, which is used in conjunction with the compressor housing 100 and the distributor 200 to achieve dynamic balance of the refrigerant oil level inside the compressor. Figure 12 and Figure 13 As shown, the compressor includes components such as a housing 100, a distributor 200, and a motor 300. An oil sump is formed at the bottom of the housing 100 to store refrigerant oil. The oil level balancing device includes an oil box 10, a lifting platform 20, a drive mechanism, a back pressure pipe 801, a conduit 802, and a pressure relief mechanism. The oil box 10 is fixedly installed on the outer wall of the housing 100 and communicates with the inner cavity of the housing 100 through an oil port 101. The drive mechanism utilizes the natural pressure difference between the internal pressure of the housing 100 and the internal pressure of the distributor 200 as a power source to drive the lifting platform 20 to move up and down within the oil box 10, thereby changing the volume of the oil storage chamber 102 and achieving automatic oil replenishment and storage.

[0025] like Figure 1 As shown, the oil box 10 is fixedly installed on the outer wall of the housing 100. An oil port 101 is provided on the side wall of the oil box 10, and a corresponding connecting port 1001 is provided on the outer wall of the housing 100. The oil port 101 and the connecting port 1001 are connected, thus forming an oil passage between the inner cavity of the oil box 10 and the inner cavity of the housing 100. The lower edge of the oil port 101 is at a first height position, and the lower end face of the upper flange inside the housing 100 is at a second height position. The first height position is higher than the second height position to ensure a good sealing effect of the refrigerant oil on the pump body. A first clearance hole 104 is provided on the top of the oil box 10 for the back pressure pipe 801 to pass through. The inner cavity of the oil box 10 is divided by the lifting platform 20 into an upper oil storage chamber 102 and a lower lower space 103.

[0026] The drive mechanism is located in the lower space 103 within the oil box 10. The drive mechanism includes a pneumatic component and a lifting component. The pneumatic component converts the pressure difference between the internal pressure of the housing 100 and the internal pressure of the distributor 200 into a linear reciprocating mechanical force. The lifting component transmits this mechanical force to the lifting platform 20 to drive the lifting platform 20 to rise or fall.

[0027] like Figure 2 As shown, the lifting assembly is installed at the bottom of the lifting platform 20. A sliding seal is formed between the outer edge of the lifting platform and the inner wall of the oil box 10, allowing the lifting platform to slide up and down along the inner wall of the oil box 10, while separating the oil storage chamber 102 from the lower space 103. A second clearance hole 201 is provided on the lifting platform 20, which corresponds vertically to the first clearance hole 104, for the passage of the back pressure pipe 801. A sliding seal is also formed between the back pressure pipe 801 and the second clearance hole 201 to ensure the sealing between the back pressure pipe 801 and the second clearance hole 201 when the lifting platform 20 is raised or lowered. An oil storage chamber 102 is formed between the upper surface of the lifting platform 20 and the oil port 101, and the volume of the oil storage chamber 102 changes with the raising or lowering of the lifting platform 20.

[0028] like Figure 5 and Figure 6 As shown, the pneumatic assembly includes a cylinder 30, a piston 40, and an elastic element 50. The piston 40 includes a plug 401 and a rod 402. The plug 401 is movably disposed within the cylinder 30 and separates the first pressure chamber 301 from the second pressure chamber 302. One end of the rod 402 is fixedly connected to or integrally formed with the plug 401, and the other end extends out of the cylinder 30 from the first pressure inlet end 3011. The elastic element 50 is disposed outside the cylinder 30 and can be a spring. In one embodiment, one end of the spring is connected to the portion of the rod 402 extending out of the cylinder 30, and the other end is fixed to the base 60. When the plug 401 retracts in the first direction (i.e., when the plug 401 retracts in the first direction...), the spring... Figure 4 and Figure 5 (From right to left), the spring is stretched to store energy. It should be noted that the elastic element 50 always applies force to the plug 401 in the second direction (i.e., from right to left). Figure 4 and Figure 5 The elastic force (from left to right), that is, the second direction is the direction in which the plug 401 extends outward toward the cylinder 30.

[0029] like Figure 3 and Figure 4As shown, the lifting assembly includes a base 60, a first bracket 701, and a second bracket 702. The base 60 is fixedly installed at the bottom of the oil box 10. The first bracket 701 and the second bracket 702 are preferably cross-hinged at the middle by a pin shaft to form a scissor-type lifting mechanism. The upper end of the first bracket 701 is slidably engaged with the first slide groove on the bottom surface of the lifting platform via a first slider, and the lower end of the first bracket 701 is hinged to the base 60. The upper end of the second bracket 702 is hinged to the bottom surface of the lifting platform, and the lower end of the second bracket 702 is slidably engaged with the second slide groove on the base 60 via a second slider. The end of the rod 402 extending out of the cylinder 30 is hinged to the piston connecting bracket on the second bracket 702. When the rod 402 retracts in the first direction (i.e., Figure 4 and Figure 5 When the rod 402 extends in the second direction (from right to left), the lower end of the second bracket 702 slides on the base 60 toward the limit position, thereby changing the angle between the first bracket 701 and the second bracket 702, and thus driving the lifting platform to rise. Conversely, when the rod 402 extends in the second direction (i.e., from right to left), the lower end of the second bracket 702 slides toward the limit position, thereby changing the angle between the first bracket 701 and the second bracket 702, and thus driving the lifting platform to rise. Figure 4 and Figure 5 When moving from left to right, the lifting platform 20 descends.

[0030] like Figure 7 As shown, the back pressure pipe 801 includes an upper port 8011, a lower port one 8012, and a lower port two 8013. The upper port 8011 extends into the housing 100 and is located in the space above the motor 300; the lower port one 8012 extends into the housing 100 and is located below the motor 300; the lower port two 8013 connects to the lower space 103 of the oil box 10. The pipe body of the back pressure pipe 801 passes sequentially through the first clearance hole 104 and the second clearance hole 201, and a sliding seal is formed between the back pressure pipe 801 and the second clearance hole 201. The pressure medium inside the housing 100 can enter the back pressure pipe 801 through the upper port 8011 and / or the lower port one 8012, then enter the lower space 103 through the lower port two 8013, and then enter the first pressure chamber 301 through the first pressure inlet end 3011. Meanwhile, any liquid refrigerant oil that may accumulate above the motor 300 can enter the back pressure pipe 801 through the upper port 8011 under gravity, and then flow back to the oil sump at the bottom of the housing 100 through the lower port 8012, thereby preventing liquid accumulation above the motor 300. One end of the conduit 802 is connected to the inside of the distributor 200, and the other end is connected to the second pressure inlet end 3021 of the cylinder 30, thereby directly introducing the internal pressure of the distributor 200 into the second pressure chamber 302.

[0031] It should be noted that when the motor drives the crankshaft to rotate, the crankshaft drives the pump body to rotate, thereby compressing the refrigerant. Since the center of the crankshaft is hollow, the refrigerant oil at the bottom of the motor can be pumped into the area above the motor. The back pressure pipe 801 has two functions: firstly, it guides the refrigerant oil above the motor through the upper port 8011 and the lower port 8012 to the area below the motor (this effect has been described above), preventing the refrigerant oil from accumulating above the motor and affecting the compressor's efficiency; secondly, it provides back pressure.

[0032] Specifically, such as Figure 7 As shown, the back pressure pipe 801 includes two integrally extending vertically, first pipe segment and second pipe segment. The top of the first pipe segment forms an upper port 8011 and the bottom forms a lower port 8012. The top of the second pipe segment communicates with the first pipe segment, and the communication position is located between the upper port 8011 and the lower port 8012. Preferably, relative to the upper port 8011 and the lower port 8012, the communication position between the top of the second pipe segment and the first pipe segment is closer to the lower port 8012. Furthermore, the bottom of the second pipe segment forms a lower port 8013, which communicates with the lower space 103 of the oil box 10. like Figures 8 to 11 As shown, the pressure relief mechanism includes a floating element 901 and a valve assembly linked to the floating element 901. The floating element 901 is preferably a hollow float ball, disposed in the oil reservoir 102, and can float up and down with the rise and fall of the oil level in the oil reservoir 102. The valve assembly is a linkage actuator in the pressure relief mechanism used to switch the pressure passage on / off and control the opening and closing of the pressure relief port. Its specific structural form can be a slide valve, ball valve, butterfly valve, or needle valve, as long as it can realize the opening and closing of the pressure passage under the action of the floating element 901. In this embodiment, the valve assembly adopts a slide valve structure, including a connecting rod 902 and a sliding element 903. The connecting rod 902 is a slender rod-shaped member, serving as a transmission connector between the floating element 901 and the sliding element 903. Its upper end is connected to the floating element 901, and its lower end passes through the connecting rod clearance hole on the movable platform and the clearance hole on the outer wall of the cylinder 30, extending into the interior of the cylinder 30. The sliding member 903 is a cylindrical slider, serving as the valve core of the valve assembly. It is slidably disposed within the large-diameter first cavity of the second pressure chamber 302, and the outer wall of the sliding member 903 slides and seals against the inner wall of the first cavity. A connecting channel 9031 is provided axially (i.e., in the reciprocating direction of the piston) through the sliding member 903. This connecting channel 9031 connects the first cavity and the second cavity when the sliding member 903 is in the first position, and is cut off by the solid portion of the sliding member 903 when the sliding member 903 is in the second position. A pressure relief port 303 is provided on the side wall of the cylinder body 30, connecting the first cavity and the lower space 103.

[0033] The slider 903 has a first position and a second position. For example... Figure 10As shown, when the oil level in the oil storage chamber 102 is not higher than the oil port 101, the floating member 901 does not float, and the sliding member 903 is in the first position. In this first position, the connecting channel 9031 connects the first chamber section and the second chamber section, thereby maintaining a pressure passage between the second pressure chamber 302 and the inside of the distributor 200 via the second pressure inlet end 3021; ​​simultaneously, the outer wall of the sliding member 903 seals the pressure relief port 303 to prevent pressure leakage. Figure 11 As shown, when the oil level in the oil storage chamber 102 is higher than the oil port 101, the floating member 901 floats above the oil surface and rises with the increase in oil level. This, in turn, drives the sliding member 903 to rise to the second position via the connecting rod 902. In this second position, the outer wall of the sliding member 903 blocks the connection between the first and second chamber sections, thereby cutting off the pressure passage between the second pressure chamber 302 and the interior of the distributor 200. Simultaneously, the sliding member 903 releases the blockage on the pressure relief port 303, opening it. At this time, the first pressure chamber 301 is connected to the lower space 103 via the first pressure inlet end 3011, and the second pressure chamber 302 is connected to the lower space 103 via the pressure relief port 303, thus maintaining pressure balance at both ends of the piston 40.

[0034] like Figure 3 and Figure 13 As shown, when the compressor operates at high speed, the internal pressure of the housing 100 increases, while the internal pressure of the distributor 200 is relatively low, increasing the pressure difference between the housing 100 and the distributor 200. This pressure difference is introduced into the first pressure chamber 301 via the back pressure pipe 801 and into the second pressure chamber 302 via the conduit 802. Since the pressure in the first pressure chamber 301 is greater than the pressure in the second pressure chamber 302, the pressure difference generates a net thrust on both sides of the plug 401. This net thrust drives the plug 401 to overcome the elastic force of the elastic element 50 and move in a first direction, which is the direction in which the plug 401 retracts into the cylinder 30. The plug 401 drives the rod 402 to retract into the cylinder 30. The rod 402, through the piston connecting bracket, drives the lower end of the second bracket 702 to slide towards the limit position on the base 60, increasing the angle between the first bracket 701 and the second bracket 702, thereby pushing the lifting platform 20 upward. The lifting platform 20 rises, reducing the volume of the oil storage chamber 102. After the liquid level rises, the refrigerant oil in the oil storage chamber 102 automatically flows back into the housing 100 through the oil port 101 and the connecting port 1001, thereby replenishing the compressor with oil and preventing the oil level in the housing 100 from being too low.

[0035] like Figure 4As shown, when the compressor operates at low speed, the internal pressure of the casing 100 decreases, and the pressure difference between the internal pressure of the casing 100 and the internal pressure of the distributor 200 decreases. At this time, the elastic force of the elastic element 50 is greater than the reverse thrust generated by the pressure difference. The elastic element 50 drives the plug 401 to move in the second direction, which is opposite to the first direction and is the direction in which the plug 401 extends outward toward the cylinder 30. The plug 401 drives the rod 402 to extend out of the cylinder 30. The rod 402 drives the lower end of the second bracket 702 to slide in the opposite direction through the piston connecting bracket, so that the included angle between the first bracket 701 and the second bracket 702 decreases, thereby driving the lifting platform 20 to descend. The descent of the lifting platform 20 increases the volume of the oil storage chamber 102. The increased refrigerant oil in the casing 100 due to the refrigerant dissolving in automatically flows into the oil storage chamber 102 through the connecting port 1001 and the oil port 101 for storage, preventing the oil level in the casing 100 from becoming too high and causing compressor failure.

[0036] During the defrosting process of the air conditioning system, a large amount of liquid refrigerant enters the housing 100 due to the operation of the four-way reversing valve, causing a sudden increase in the oil level inside the housing 100. When the oil enters the oil storage chamber 102 through the oil port 101 and the oil level is higher than the position of the oil port 101, the floating component 901 rises rapidly under the action of buoyancy, and drives the sliding component 903 from the first position to the second position through the connecting rod 902. After the sliding component 903 rises to the second position, it immediately closes the pressure passage between the second pressure chamber 302 and the distributor 200 and opens the pressure relief port 303. At this time, the first pressure chamber 301 is connected to the lower space 103 through the first pressure inlet end 3011, and the second pressure chamber 302 is connected to the lower space 103 through the pressure relief port 303, and the pressure at both ends of the piston 40 is quickly balanced. Under the elastic force of the elastic element 50, the plug 401 extends rapidly in the second direction, driving the lifting platform 20 to descend further to the lowest position, maximizing the volume of the oil storage chamber 102, thereby urgently storing a large amount of oil from the casing 100, preventing the oil from overflowing the exhaust port and being carried into the refrigerant circulation system in large quantities, effectively avoiding the risk of temporary oil shortage in the compressor.

[0037] In summary, the oil level balancing device and compressor of the present application embodiments have at least the following beneficial technical effects: First, the device uses a purely mechanical structure to achieve dynamic oil level balance. It fully utilizes the natural pressure difference between the inside of the compressor housing and the distributor as a power source during compressor operation. It does not require additional electronic control components, sensors or external power devices, which fundamentally eliminates the risk of electronic control failure. Moreover, it has zero additional energy consumption and significant energy-saving and environmental protection effects. Secondly, the device adopts an external design, and the oil box 10 can be fixed to the outer wall of the housing 100. It requires minimal modification to the compressor body structure, has strong versatility, and is easy to adapt to mass production on different models of compressors. Third, while introducing back pressure, the back pressure pipe 801 can use the height difference between its upper port 8011 and lower port 8012 to divert the liquid refrigerant oil that may accumulate above the motor 300 back to the bottom oil tank, which not only prevents the motor 300 from being submerged in liquid, but also realizes the recycling of refrigerant oil. Fourth, the device has a triple protection mechanism. Under normal operating conditions, it automatically replenishes and stores oil through pressure difference. Under extreme operating conditions, it responds quickly through the pressure relief mechanism, forcing the lifting platform 20 to descend to the limit position to maximize the oil storage space. It is extremely robust and significantly improves the operating stability and reliability of the compressor under complex operating conditions such as variable speed operation and defrosting.

[0038] Those skilled in the art should understand that the sequence numbers or order of description of the various embodiments in this application are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. Furthermore, the above embodiments are only optional implementations of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0039] Those skilled in the art should also understand that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

Claims

1. An oil level balancing device, characterized in that, For use with the compressor housing (100) and distributor (200), the oil level balancing device includes: An oil box (10) is used to be installed on the outer side wall of the housing (100). The oil box (10) is provided with an oil port (101) that connects the inner cavity of the oil box (10) and the inner cavity of the housing (100). The lifting platform (20) is vertically mounted in the inner cavity of the oil box (10), and an oil storage cavity (102) is formed between the upper surface of the lifting platform (20) and the oil port (101). A drive mechanism acts on the lifting platform (20). The drive mechanism has a first pressure inlet end (3011) and a second pressure inlet end (3021). The first pressure inlet end (3011) is used to communicate with the interior of the housing (100) to introduce the internal pressure of the housing (100). The second pressure inlet end (3021) is used to communicate with the interior of the distributor (200) to introduce the internal pressure of the distributor (200). The drive mechanism is configured to use the pressure difference between the internal pressure of the housing (100) and the internal pressure of the distributor (200) as a power source, and is configured as follows: When the compressor operates at high speed, causing the pressure difference to increase, the lifting platform (20) is driven to rise, thereby reducing the volume of the oil storage chamber (102) and allowing the oil in the oil storage chamber (102) to be replenished into the housing (100) through the oil port (101). When the compressor operates at low speed, causing the pressure difference to decrease, the lifting platform (20) is driven to descend, thereby increasing the volume of the oil storage chamber (102) so that the oil in the housing (100) flows into the oil storage chamber (102) through the oil port (101) for storage.

2. The oil level balancing device according to claim 1, characterized in that, The drive mechanism includes a pneumatic component and a lifting component, which are located in the oil box (10) and in the lower space (103) below the lifting platform (20). The pneumatic assembly includes a cylinder (30), a piston (40), and an elastic element (50). The piston (40) is movably disposed within the cylinder (30) and divides the inner cavity of the cylinder (30) into a first pressure chamber (301) and a second pressure chamber (302). One end of the cylinder (30) has a first pressure inlet end (3011) that connects the first pressure chamber (301) and the interior of the housing (100). The other end of the cylinder (30) has a second pressure inlet end (3021) that connects the second pressure chamber (302) and the interior of the distributor (200). The lifting assembly is connected to the piston (40) in a transmission manner, and the lifting assembly acts on the lifting platform (20). The elastic element (50) acts on the piston (40). When the compressor operates at high speed, the pressure difference between the internal pressure of the housing (100) and the internal pressure of the distributor (200) increases. The pressure difference drives the piston (40) to overcome the elastic force of the elastic element (50) and move along the first direction, so as to drive the lifting platform (20) to rise through the lifting assembly. When the compressor operates at low speed, the pressure difference between the internal pressure of the housing (100) and the internal pressure of the distributor (200) decreases. The elastic element (50) drives the piston (40) to move along the second direction opposite to the first direction, so as to drive the lifting platform (20) to fall through the lifting assembly.

3. The oil level balancing device according to claim 2, characterized in that, The piston (40) includes a plug body (401) and a rod body (402). The plug body (401) is movably disposed inside the cylinder (30). One end of the rod body (402) is connected to the plug body (401), and the other end extends out of the cylinder (30) from the first pressure inlet end (3011) and is connected to an elastic member (50) outside the cylinder (30). The portion of the rod (402) located outside the cylinder (30) is connected to the lifting assembly via a transmission connection.

4. The oil level balancing device according to claim 3, characterized in that, The lifting assembly includes: The base (60) is located inside the oil box (10); The first bracket (701) and the second bracket (702) are cross-hinged. The upper end of the first bracket (701) is slidably connected to the lifting platform (20) and the lower end is connected to the base (60). The upper end of the second bracket (702) is connected to the lifting platform (20) and the lower end is slidably connected to the base (60). The part of the rod (402) extending out of the cylinder (30) is connected to the second bracket (702) for transmission, so that the lower end of the second bracket (702) slides relative to the base (60) through the extension and retraction of the rod (402), thereby changing the included angle between the first bracket (701) and the second bracket (702) to drive the lifting platform (20) to rise or fall.

5. The oil level balancing device according to claim 2, characterized in that, The oil level balancing device also includes: Back pressure pipe (801), one end of which is used to connect to the inside of the housing (100), and the other end is used to connect to the lower space (103) in the oil box (10). The conduit (802) has one end connected to the inside of the liquid dispenser (200) and the other end connected to the second pressure inlet (3021) of the cylinder (30). The first pressure inlet end (3011) of the cylinder (30) is connected to the lower space (103) to introduce the internal pressure of the housing (100) into the first pressure chamber (301) through the back pressure pipe (801) and the lower space (103). The conduit (802) is used to directly introduce the internal pressure of the distributor (200) into the second pressure chamber (302).

6. The oil level balancing device according to claim 5, characterized in that, The top of the oil box (10) is provided with a first clearance hole (104), and the lifting platform (20) is provided with a second clearance hole (201) corresponding to the first clearance hole (104). The air outlet of the back pressure pipe (801) passes through the first clearance hole (104) and the second clearance hole (201) in sequence and extends into the lower space (103). A sliding seal is formed between the back pressure pipe (801) and the second clearance hole (201).

7. The oil level balancing device according to claim 5, characterized in that, The back pressure pipe (801) includes an upper port (8011), a lower port one (8012), and a lower port two (8013). The upper port (8011) is used to connect the space inside the housing (100) above the motor (300). The lower port one (8012) is used to connect the space inside the housing (100) below the motor (300). The lower port two (8013) connects to the lower space (103) so that the internal pressure of the housing (100) can be introduced into the back pressure pipe (801) through the upper port (8011) and / or the lower port one (8012), and enter the lower space (103) of the oil box (10) through the lower port two (8013).

8. The oil level balancing device according to any one of claims 2-7, characterized in that, The oil level balancing device also includes a pressure relief mechanism, which includes a floating element (901) and a valve assembly linked to the floating element (901). The floating element (901) is located in the oil storage chamber (102) and can float with the liquid level. The valve assembly is configured such that when the liquid level in the oil storage chamber (102) is not higher than the preset position, the pressure passage between the second pressure inlet end (3021) and the inside of the distributor (200) is kept open; when the liquid level in the oil storage chamber (102) is higher than the preset position, the floating member (901) drives the valve assembly to close the pressure passage and balance the pressure at both ends of the piston (40). After the pressure at both ends of the piston (40) is balanced, the elastic member (50) drives the piston (40) to move along the second direction through its own elastic force, so as to drive the lifting platform (20) to descend.

9. The oil level balancing device according to claim 8, characterized in that, The valve assembly includes a connecting rod (902) and a sliding member (903). The sliding member (903) is slidably disposed in the second pressure chamber (302) inside the cylinder (30). The upper end of the connecting rod (902) is connected to the floating member (901), and the lower end passes through the lifting platform (20) and the outer wall of the cylinder (30) and is connected to the sliding member (903). The cylinder (30) is also provided with a pressure relief port (303) that communicates with the second pressure chamber (302). When the oil level in the oil storage chamber (102) is not higher than the oil port (101), the floating member (901) does not float on the oil surface, and the sliding member (903) is in the first position. In the first position, the sliding member (903) connects the pressure passage between the second pressure chamber (302) and the inside of the distributor (200) and blocks the pressure relief port (303). When the oil level in the oil storage chamber (102) is higher than the oil port (101), the floating member (901) floats on the oil surface and moves with the flow of the oil. During the process of the liquid level rising, the connecting rod (902) drives the sliding member (903) to rise to the second position. In the second position, the sliding member (903) shuts off the pressure passage between the second pressure chamber (302) and the inside of the liquid distributor (200) and opens the pressure relief port (303) so that the first pressure chamber (301) and the second pressure chamber (302) are connected to the lower space (103) through the first pressure inlet end (3011) and the pressure relief port (303) respectively, so that the pressure at both ends of the piston (40) remains balanced.

10. The oil level balancing device according to claim 9, characterized in that, The second pressure chamber (302) includes a first chamber section with a large diameter and a second chamber section with a small diameter. The first chamber section is connected to the second chamber section, and the inlet of the second chamber section is formed with a second pressure inlet end (3021) that is connected to the inside of the liquid dispenser (200). The pressure relief hole is connected to the first cavity section, the sliding member (903) is disposed in the first cavity section with a large diameter, and a connecting channel (9031) is provided through the sliding member (903). When the sliding member (903) is in the first position, the connecting channel (9031) connects the first cavity segment and the second cavity segment, and the outer wall of the sliding member (903) blocks the pressure relief hole. When the sliding member (903) is in the second position, the outer wall of the sliding member (903) blocks the connection position of the first cavity segment and the second cavity segment, and releases the blockage of the pressure relief port (303).

11. A compressor, characterized in that, Includes the oil level balancing device according to any one of claims 1-10.

12. The compressor according to claim 11, characterized in that, The compressor includes: The housing (100) has an oil box (10) fixed on the outer wall of the housing (100), and the outer wall of the housing (100) has a communication port (1001) corresponding to the oil port (101) of the oil box (10). The lower edge of the connecting port (1001) is at a first height position, and the lower end face of the upper flange inside the housing (100) is at a second height position. The first height position is higher than the second height position.

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