Internal pressure relief mechanism of scroll compressor

Abstract

The utility model relates to the technical field of scroll compressors, in particular to an internal pressure relief mechanism of a scroll compressor. The internal pressure relief mechanism of the scroll compressor comprises a main shell, a rear shell, a main rack, a static scroll plate, a dynamic scroll plate and a pressure relief valve, the static vortex plate is arranged in the rear shell in a sealed mode, and a high-pressure cavity is defined by the top of the static vortex plate and the rear shell. The dynamic vortex plate is meshed with the static vortex plate, so that the dynamic vortex plate does circumferential translation around the static vortex plate; a through pressure relief channel is arranged in the static vortex disc; the pressure relief channel is provided with a first end and a second end which are opposite to each other in the extension direction of the pressure relief channel; the first end of the pressure relief channel penetrates to the top of the static vortex plate, and the second end of the pressure relief channel is connected with the air suction cavity; the first end directly faces the high-pressure cavity, and the pressure release valve is arranged at the first end. In this way, pressure relief operation on the refrigerant can be completed in the compressor, the refrigerant can be effectively circulated, and meanwhile safety is better.

Description

Technical Field

[0001] This utility model relates to the field of scroll compressor technology, and more specifically, to an internal pressure relief mechanism for a scroll compressor. Background Technology

[0002] With the increasingly widespread application of electric scroll compressors in the field of new energy vehicles, higher requirements are being placed on their safety and reliability. To protect the compressor and its system from overpressure damage, most electric scroll compressors are equipped with pressure relief devices to ensure that the system operates within a safe pressure range. Since new energy vehicles generally use non-flammable and highly safe refrigerants such as R134a, traditional electric scroll compressors mostly employ external pressure relief methods: that is, by installing an external pressure relief valve with a specific pressure specification on the high-pressure chamber or exhaust side of the compressor, when the exhaust pressure exceeds the set value, the valve automatically opens, directly venting the refrigerant gas to the atmosphere, thus releasing the high-pressure gas.

[0003] With the development and increasing application of new energy vehicles in recent years, and the growing attention people pay to environmental issues such as global warming, the traditional external pressure relief method for electric scroll compressors is increasingly showing its limitations.

[0004] 1) Refrigerant upgrades. Non-flammable refrigerants such as R134a will be gradually replaced by environmentally friendly R290. Because R290 is a Class A3 highly flammable refrigerant, using external pressure relief poses a significant safety hazard.

[0005] 2) Traditional R134a refrigerant has a high warming potential, and long-term release into the air will cause a high greenhouse effect, which is not conducive to long-term development.

[0006] 3) Safety issues. The working environment of compressors is usually harsh, and external pressure relief methods can easily cause the pressure relief valve to become clogged and malfunction, preventing high-pressure gas from being discharged in time and creating certain safety hazards;

[0007] 4) Cost issues. Long-term direct release of refrigerant gas into the external environment prevents the refrigerant from being effectively recycled, resulting in high waste rates and increased operating costs. Utility Model Content

[0008] The purpose of this invention includes, for example, providing an internal pressure relief mechanism for a scroll compressor, which can perform pressure relief of the refrigerant inside the compressor, so that the refrigerant can be effectively circulated while improving safety.

[0009] The embodiments of this utility model can be implemented as follows:

[0010] In a first aspect, this utility model provides an internal pressure relief mechanism for a scroll compressor, comprising:

[0011] Main housing, rear housing, main frame, stationary scroll, moving scroll, and pressure relief valve;

[0012] The end face of the main housing is connected to the end face of the opening of the rear housing, and the main frame is disposed at the end of the main housing near the rear housing;

[0013] The stationary vortex disk is enclosed in the rear housing, and the top of the stationary vortex disk and the rear housing enclose a high-pressure chamber, which includes an exhaust high-pressure chamber and an oil return high-pressure chamber.

[0014] The moving volute meshes with the stationary volute so that the moving volute moves in a circular motion around the stationary volute.

[0015] The stationary vortex disk is provided with a through pressure relief channel; along the extending direction of the pressure relief channel, the pressure relief channel has a first end and a second end opposite to each other; the first end of the pressure relief channel extends to the top of the stationary vortex disk, and the second end of the pressure relief channel is connected to the intake chamber;

[0016] The first end is directly opposite the high-pressure chamber, and the pressure relief valve is located at the first end.

[0017] In an optional embodiment, the inner wall of the main housing and the main frame enclose the air intake chamber;

[0018] The second end of the pressure relief channel extends to the bottom of the static vortex disk to form a vent hole, and the main frame has a through vent groove; the vent hole and the vent groove are directly opposite each other so that the pressure relief channel is connected to the air intake chamber.

[0019] In an optional embodiment, the circumferential outer wall of the static vortex disk and the circumferential inner wall of the rear housing enclose the air intake cavity.

[0020] The second end of the pressure relief channel extends through the circumferential outer wall of the stationary vortex disk.

[0021] In an optional embodiment, the static vortex disk includes a static vortex substrate and a static vortex profile; the static vortex profile is disposed on the end face of the static vortex substrate; a through air intake is disposed on the outer wall of the static vortex disk, and two adjacent vortex profiles directly opposite the air intake form the air intake cavity.

[0022] In an optional embodiment, the extension direction of the pressure relief channel is perpendicular to the surface of the vortex substrate.

[0023] In an optional embodiment, the stationary vortex disk is provided with at least two pressure relief channels and an air intake port;

[0024] Each of the pressure relief channels is provided with a pressure relief valve; two adjacent vortex lines facing each of the air intakes enclose and form an air intake chamber;

[0025] Multiple pressure relief channels are evenly arranged along the circumferential direction of the stationary vortex disk.

[0026] In an optional embodiment, the pressure relief valve includes a valve body, a ball, a plunger, an elastic element, and a front cover;

[0027] The valve body has a sealed inner cavity, and the ball, plunger, elastic element, and front cover are sequentially arranged in the inner cavity;

[0028] The top of the valve body is provided with a through air inlet, the bottom of the elastic element is held against the bottom wall of the inner cavity by the front cover, and the top of the elastic element is held against the ball by the plunger;

[0029] The elastic element is configured to provide an elastic force that causes the ball to always move toward the air inlet and block the air inlet;

[0030] The valve body is provided with an air outlet.

[0031] In an optional embodiment, the air outlet penetrates the side wall of the valve body and is located on the side wall of the valve body near the air inlet; when the ball moves away from the air inlet, the air inlet communicates with the air outlet.

[0032] In an optional embodiment, along the axial direction of the valve body, the valve body includes an upper part and a lower part connected in sequence; the outer diameter of the lower part is smaller than the outer diameter of the upper part;

[0033] The air inlet is located on the upper part, and the air outlet is located on the lower part near the upper part.

[0034] In an optional embodiment, the air outlet penetrates through the bottom of the valve body; the plunger is provided with a plurality of airflow channels, each of which extends along the axis of the plunger, and the plurality of airflow channels are evenly distributed circumferentially on the plunger;

[0035] A pressure relief air path is formed from the air inlet, the airflow channel to the air outlet.

[0036] The beneficial effects of this utility model embodiment include, for example:

[0037] The internal pressure relief mechanism of this scroll compressor includes a main housing, a rear housing, a main frame, a stationary scroll, a moving scroll, and a pressure relief valve. A through-flow pressure relief channel is provided in the stationary scroll; along the extension direction of the pressure relief channel, it has a first end and a second end; the first end of the pressure relief channel extends to the top of the stationary scroll, and the second end connects to the suction chamber. By placing the pressure relief channel inside the compressor, the safety deficiencies and environmental pollution problems caused by external pressure relief can be mitigated, while also effectively circulating the refrigerant and reducing operating costs. In summary, this pressure relief mechanism has the advantages of simple structure, convenient installation, energy saving and environmental protection, and low operating costs. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the internal pressure relief mechanism of the scroll compressor in Embodiment 1 of this utility model;

[0040] Figure 2 This is a schematic diagram of the pressure relief valve according to Embodiment 1 of this utility model;

[0041] Figure 3 This is a schematic diagram of the pressure relief air path of the pressure relief valve in Embodiment 1 of this utility model;

[0042] Figure 4 This is a schematic diagram of another embodiment of the pressure relief valve of Embodiment 1 of this utility model;

[0043] Figure 5 This is a schematic diagram of the pressure relief air path of another embodiment of the pressure relief valve of the present utility model;

[0044] Figure 6 This is a schematic diagram of the internal pressure relief mechanism of the scroll compressor in Embodiment 2 of this utility model;

[0045] Figure 7 This is a schematic diagram of the internal pressure relief mechanism of the scroll compressor in Embodiment 3 of this utility model;

[0046] Figure 8 This is a schematic diagram of another embodiment of the internal pressure relief mechanism of the scroll compressor in Embodiment 3 of this utility model.

[0047] Icons: 11-Exhaust high-pressure chamber; 12-Intake chamber; 13-Return oil high-pressure chamber; 100-Main housing; 200-Rear housing; 300-Main frame; 310-Ventilation slot; 400-Still vortex plate; 410-Still vortex base plate; 420-Still vortex profile; 430-Intake port; 500-Moving vortex plate; 600-Pressure relief valve; 610-Valve body; 611-Intake port; 612-Outtake port; 620-Spherical body; 630-Plunger; 631-Airflow channel; 640-Elastic element; 650-Front cover; 661-Upper part; 662-Lower part; 700-Pressure relief channel; 701-First end; 702-Second end; 710-Ventilation port. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0052] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0053] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0054] Example 1

[0055] Please refer to Figure 1 This embodiment provides an internal pressure relief mechanism for a scroll compressor, including a main housing 100, a rear housing 200, a main frame 300, a stationary scroll 400, a moving scroll 500, and a pressure relief valve 600.

[0056] The end face of the main housing 100 is connected to the end face of the opening of the rear housing 200, and the main frame 300 is disposed at the end of the main housing 100 near the rear housing 200;

[0057] The stationary vortex disk 400 is enclosed in the rear housing 200, and the top of the stationary vortex disk 400 and the rear housing 200 enclose a high-pressure chamber, which includes an exhaust high-pressure chamber 11 and an oil return high-pressure chamber 13.

[0058] The moving scroll 500 meshes with the stationary scroll 400 so that the moving scroll 500 moves in a circular motion around the stationary scroll 400.

[0059] A through pressure relief channel 700 is provided in the stationary vortex disk 400; along the extending direction of the pressure relief channel 700, the pressure relief channel 700 has a first end 701 and a second end 702; the first end 701 of the pressure relief channel 700 extends to the top of the stationary vortex disk 400, and the second end 702 of the pressure relief channel 700 is connected to the intake chamber 12.

[0060] The first end 701 is directly opposite the high-pressure chamber, and the pressure relief valve 600 is located at the first end 701.

[0061] The internal pressure relief mechanism of this scroll compressor includes a main housing 100, a rear housing 200, a main frame 300, a stationary scroll 400, a moving scroll 500, and a pressure relief valve 600. A through pressure relief channel 700 is provided in the stationary scroll 400; along the extending direction of the pressure relief channel 700, the pressure relief channel 700 has a first end 701 and a second end 702; the first end 701 of the pressure relief channel 700 extends to the top of the stationary scroll 400, and the second end 702 of the pressure relief channel 700 is connected to the suction chamber 12. By placing the pressure relief channel 700 inside the compressor, the safety deficiencies and environmental pollution problems caused by external pressure relief can be improved, while also effectively circulating the refrigerant and reducing operating costs. This pressure relief mechanism has the advantages of simple structure, convenient installation, energy saving and environmental protection, and low operating costs.

[0062] from Figure 1As can be seen, in the optional embodiment, the inner wall of the main housing 100 and the main frame 300 enclose to form an air intake chamber 12; the second end 702 of the pressure relief channel 700 extends to the bottom of the stationary vortex disk 400 to form a vent 710, and the main frame 300 has a through vent groove 310; the vent 710 and the vent groove 310 are directly opposite each other so that the pressure relief channel 700 is connected to the air intake chamber 12.

[0063] Optionally, in this embodiment, the first end 701 of the pressure relief channel 700 is directly opposite the exhaust high-pressure chamber 11.

[0064] In use, the pressure relief valve 600 is installed inside the stationary vortex plate 400. The pressure relief channel 700 of the stationary vortex plate 400 and the pressure relief channel 700 of the main frame 300 together constitute the internal pressure relief channel 700. The first end 701 of the pressure relief valve 600 is connected to the high-pressure exhaust chamber 11 inside the rear housing 200, and the second end 702 is connected to the low-pressure intake chamber 12 of the housing through the internal pressure relief channel 700.

[0065] Please see Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown in the figure, in an optional embodiment, the pressure relief valve 600 includes a valve body 610, a ball 620, a plunger 630, an elastic element 640, and a front cover 650. The valve body 610 has a sealed inner cavity, in which the ball 620, plunger 630, elastic element 640, and front cover 650 are sequentially arranged. A through air inlet 611 is provided at the top of the valve body 610. The bottom of the elastic element 640 is supported against the bottom wall of the inner cavity by the front cover 650, and the top of the elastic element 640 is supported against the ball 620 by the plunger 630. The elastic element 640 is configured to provide an elastic force that keeps the ball 620 moving towards and blocking the air inlet 611. An air outlet 612 is provided on the valve body 610. Optionally, the elastic element 640 is a spring.

[0066] Furthermore, a pressure relief path for the pressure relief valve 600 is formed from the air inlet 611 to the air outlet 612. The curve with arrows in the figure represents the pressure relief path in the pressure relief valve 600.

[0067] Please see Figure 2 and Figure 3 As can be seen from the figure, in the optional embodiment, the air outlet 612 penetrates the side wall of the valve body 610, and the air outlet 612 is located on the side wall of the valve body 610 near the air inlet 611; when the ball 620 moves away from the air inlet 611, the air inlet 611 and the air outlet 612 are connected.

[0068] The working principle of the pressure relief valve 600 is: to balance the pressure difference between the high-pressure exhaust chamber 11 and the low-pressure intake chamber 12 of the housing by means of spring pressure; when the pressure difference between the high and low chambers does not exceed the spring pressure, the pressure relief valve 600 is in the closed state, and all the gas compressed by the vortex chamber is discharged into the system through the compressor exhaust port.

[0069] When the pressure difference between the high and low pressure chambers exceeds the spring pressure, the ball 620 of the pressure relief valve 600 opens. The opening degree of the ball 620 is positively correlated with the magnitude of the pressure difference. At this time, some of the high-temperature and high-pressure refrigerant gas enters the annular channel formed by the outer ring of the valve body 610 and the inner ring of the mounting hole from the outlet 612 on the side of the valve body 610, and then is discharged to the low-pressure suction chamber 12 of the housing through the internal pressure relief channel 700, thereby achieving the purpose of pressure relief. The high-temperature and high-pressure refrigerant gas discharged to the low-pressure suction chamber 12 of the housing undergoes sufficient expansion, pressure reduction, and convective heat transfer, becoming a low-temperature and low-pressure refrigerant gas, which then enters the vortex suction low-pressure suction chamber 12 to continue to be compressed.

[0070] Furthermore, in an optional embodiment, along the axial direction of the valve body 610, the valve body 610 includes an upper part 661 and a lower part 662 connected in sequence; the outer diameter of the lower part 662 is smaller than the outer diameter of the upper part 661; an air inlet 611 is disposed on the upper part 661, and an air outlet 612 is disposed on the lower part 662 near the end of the upper part 661. This arrangement allows the refrigerant flowing out from the air outlet 612 to flow smoothly along the outer wall of the lower part 662 to the low-pressure suction chamber 12, while also allowing the outer wall of the lower part 662 and the inner wall of the pressure relief channel 700 to form a gap space for refrigerant flow.

[0071] Please see Figure 4 and Figure 5 In an optional embodiment, the air outlet 612 penetrates the bottom of the valve body 610; the plunger 630 is provided with a plurality of airflow channels 631, each airflow channel 631 extending along the axis of the plunger 630, and the plurality of airflow channels 631 are evenly distributed circumferentially on the plunger 630; a pressure relief air passage is formed from the air inlet 611, the airflow channels 631 to the air outlet 612.

[0072] The working principle of such a pressure relief valve 600 is as follows: axial airflow channels 631 are evenly opened around the plunger 630 of the pressure relief valve 600. The number and diameter of the airflow channels 631 need to be determined according to the flow area entering the pressure relief valve 600. When the exhaust pressure difference exceeds the set value, the pressure relief valve 600 opens, and the high-temperature and high-pressure refrigerant gas enters the internal pressure relief channel 700 through the straight channel formed by the airflow channels 631, and is then discharged to the low-pressure suction chamber 12 of the housing.

[0073] The installation of the pressure relief valve 600 must ensure good sealing performance. An interference fit, welding, or tapered thread fit can be selected to ensure that high-pressure gas can only enter the pressure relief channel 700 through the ball 620. In this embodiment, the pressure relief port is located in the low-pressure intake chamber 12 of the housing. This helps to utilize the large buffer volume of the low-pressure intake chamber 12 to ensure sufficient expansion and convective heat transfer of the high-temperature, high-pressure gas. Consequently, the gas re-entering the vortex intake chamber 12 is a milder, lower-temperature, low-pressure gas, which helps to reduce the airflow impact within the vortex intake chamber 12, reduce exhaust temperature rise and exhaust pulses, and improve safety and reliability.

[0074] It should be noted that the rear housing 200 has a high-pressure return oil chamber 13. The first end 701 of the pressure relief channel 700 can also be directly opposite the high-pressure return oil chamber 13 (i.e., the pressure relief valve 600 relieves pressure on the high-pressure return oil chamber 13), but a sufficient height difference must be ensured with respect to the oil return hole to ensure that the lubricating oil does not enter the low-pressure intake chamber 12 from the pressure relief channel 700.

[0075] Example 2

[0076] like Figure 6 As shown, this embodiment is largely the same as the previous embodiment, except that the outer circumferential wall of the stationary vortex disk 400 and the inner circumferential wall of the rear housing 200 form an air intake chamber 12; the second end 702 of the pressure relief channel 700 extends through to the outer circumferential wall of the stationary vortex disk 400.

[0077] The intake chamber 12 here is formed by an annular installation gap between the outer wall of the stationary vortex plate 400 and the inner wall of the rear housing 200. This annular low-pressure intake chamber 12 is connected to the vortex intake port 430. The pressure relief valve 600 and the internal pressure relief channel 700 are both set in the stationary vortex plate 400. The first end 701 of the pressure relief valve 600 is connected to the high-pressure exhaust chamber 11 inside the rear housing 200, and the second end 702 is connected to the annular low-pressure intake chamber 12 through the internal pressure relief channel 700.

[0078] When the pressure difference between the high-pressure and low-pressure suction chambers 12 exceeds a set value, the pressure relief valve 600 opens. The high-temperature, high-pressure refrigerant gas in the exhaust high-pressure chamber 11 is directly discharged into the annular low-pressure suction chamber 12 through the internal pressure relief channel 700. Utilizing this annular space, the gas undergoes sufficient expansion, pressure reduction, and heat exchange, transforming into a low-temperature, low-pressure gas before entering the vortex suction chamber 12 for further compression. The direction of the pressure relief valve 600 mounting hole and the path of the pressure relief channel 700 can be determined according to the structure of the stationary vortex 400, ensuring manufacturing and installation feasibility.

[0079] In this embodiment, the pressure relief port is set in the annular low-pressure intake chamber 12, making full use of the annular installation gap between the stationary vortex disk 400 and the rear housing 200. This reduces the number of parts to be processed. At the same time, while ensuring a certain distance between the pressure relief port and the vortex intake port 430, the high-temperature and high-pressure gas can be fully expanded and heat exchanged before entering the vortex intake chamber 12.

[0080] Example 3

[0081] like Figure 7 As shown, this embodiment is largely the same as the previous embodiment, except that the static vortex disk 400 in this embodiment includes a static vortex substrate 410 and a static vortex profile 420; the static vortex profile 420 is disposed on the end face of the static vortex substrate 410; a through air intake 430 is disposed on the outer wall of the static vortex disk 400, and two adjacent vortex profiles opposite to the air intake 430 enclose an air intake cavity 12.

[0082] The pressure relief valve 600 is installed inside the stationary vortex plate 400. Its first end 701 is connected to the exhaust high-pressure chamber 11, and its second end 702 is directly connected to the vortex low-pressure intake chamber 12.

[0083] When the pressure difference between the high and low pressure suction chambers 12 exceeds the set value, the pressure relief valve 600 opens, and the high-temperature and high-pressure refrigerant gas in the exhaust high-pressure chamber 11 directly enters the vortex suction chamber 12 through the pressure relief valve 600. To ensure a larger pressure relief space and sufficient expansion and heat exchange, the pressure relief port should be located as close as possible to the vortex suction port 430.

[0084] In an optional embodiment, the extending direction of the pressure relief channel 700 is perpendicular to the surface of the vortex substrate 410. This shortens the length of the pressure relief channel 700, improving pressure relief efficiency and circulation effect.

[0085] like Figure 8 As shown, the internal pressure relief structure of the above embodiment is simple and easy to implement, but the high temperature and high pressure of the gas can easily cause a large airflow impact on the intake chamber 12, resulting in a pressure imbalance between the two vortex intake chambers 12 and an increase in exhaust pulses. In order to effectively solve the problem of pressure imbalance in the vortex intake chamber 12 caused by airflow impact, this embodiment proposes a dual pressure relief valve 600 structure.

[0086] In an optional embodiment, the stationary vortex disk 400 is provided with at least two pressure relief channels 700 and an air intake port 430; each pressure relief channel 700 is provided with a pressure relief valve 600; two adjacent vortex lines opposite each air intake port 430 enclose an air intake chamber 12; multiple pressure relief channels 700 are evenly arranged along the circumferential direction of the stationary vortex disk 400.

[0087] Furthermore, this embodiment illustrates the pressure relief mechanism of the dual pressure relief valve 600. From Figure 8 As can be seen, pressure relief valves 600 are installed in both low-pressure intake chambers 12 of the stationary vortex plate 400. To ensure that both pressure relief valves 600 can open simultaneously, the position of the pressure relief valves 600 needs to be adjusted according to whether the vortex is symmetrical or not, to ensure that the pressure difference across the two ends of the pressure relief valves 600 is consistent. The dual pressure relief valve 600 structure in this embodiment can effectively reduce exhaust pulses caused by a single valve.

[0088] In summary, this utility model embodiment provides an internal pressure relief mechanism for a scroll compressor, which has at least the following advantages:

[0089] Through a specific pressure relief channel 700 and a built-in pressure relief valve 600, high-temperature and high-pressure refrigerant gas is discharged from the high-pressure chamber of the compressor to the low-pressure suction chamber 12 (such as the housing low-pressure suction chamber 12, the scroll suction chamber 12, the annular low-pressure suction chamber 12, etc.):

[0090] 1) It can be used with A3-class flammable refrigerants such as R290, avoiding safety hazards caused by refrigerant discharge, and has a wider range of applications.

[0091] 2) It enables the refrigerant to be effectively recycled, reducing refrigerant waste and avoiding environmental problems caused by direct refrigerant emissions.

[0092] 3) The pressure relief valve 600 is built-in, which can avoid the blockage problem caused by harsh environment, making it more adaptable and safer.

[0093] 4) The refrigerant can circulate repeatedly inside the compressor, which has the advantages of saving energy and reducing costs.

[0094] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An internal pressure relief mechanism of a scroll compressor, characterized by, The internal pressure relief mechanism of scroll compressor comprises a main shell (100), a rear shell (200), a main frame (300), a static scroll (400), a dynamic scroll (500) and a pressure relief valve (600). The end face of the main shell (100) is connected with the end face of the opening of the rear shell (200), and the main frame (300) is arranged at the end of the main shell (100) close to the rear shell (200). The static scroll (400) is hermetically arranged in the rear shell (200), and the top of the static scroll (400) and the rear shell (200) form a high-pressure cavity, which comprises an exhaust high-pressure cavity (11) and an oil return high-pressure cavity (13). The dynamic scroll (500) is engaged with the static scroll (400) to make the dynamic scroll (500) move circumferentially around the static scroll (400). The static scroll (400) is provided with a pressure relief channel (700) penetrating therethrough; along the extension direction of the pressure relief channel (700), the pressure relief channel (700) has opposite first and second ends (701) and (702); the first end (701) of the pressure relief channel (700) penetrates to the top of the static scroll (400), and the second end (702) of the pressure relief channel (700) is connected with the suction cavity (12). The first end (701) faces the high-pressure cavity, and the pressure relief valve (600) is arranged at the first end (701).

2. The internal pressure relief mechanism of scroll compressor according to claim 1, wherein: The inner wall of the main shell (100) and the main frame (300) form the suction cavity (12); The second end (702) of the pressure relief channel (700) penetrates to the bottom of the static scroll (400) to form an air vent hole (710), and the main frame (300) has a penetrating air vent groove (310); the air vent hole (710) faces the air vent groove (310) to connect the pressure relief channel (700) with the suction cavity (12).

3. The internal pressure relief mechanism of scroll compressor according to claim 1, wherein: The circumferential outer side wall of the static scroll (400) and the circumferential inner side wall of the rear shell (200) form the suction cavity (12); The second end (702) of the pressure relief channel (700) penetrates to the circumferential outer side wall of the static scroll (400).

4. The internal pressure relief mechanism of scroll compressor according to claim 1, wherein: The static scroll (400) comprises a static scroll base plate (410) and a static scroll profile (420); the static scroll profile (420) is arranged on the end face of the static scroll base plate (410); the outer wall of the static scroll (400) is provided with a penetrating suction port (430), and two adjacent scroll lines facing the suction port (430) form the suction cavity (12).

5. The internal pressure relief mechanism of scroll compressor according to claim 4, wherein: The extension direction of the pressure relief channel (700) is perpendicular to the plate face of the static scroll base plate (410). ​ 6. The internal pressure relief mechanism of scroll compressor according to claim 4, characterized in that: At least two pressure relief channels (700) and suction ports (430) are arranged on the fixed scroll (400); Each of the pressure relief channels (700) is provided with a pressure relief valve (600); and each of the suction ports (430) is surrounded by two adjacent scroll lines to form a suction cavity (12). A plurality of the pressure relief channels (700) are uniformly arranged along the circumferential direction of the fixed scroll (400).

7. The internal pressure relief mechanism of scroll compressor according to claim 1, characterized in that: The pressure relief valve (600) comprises a valve body (610), a ball (620), a plunger (630), an elastic member (640) and a front cover (650); The valve body (610) has a closed inner cavity, and the ball (620), the plunger (630), the elastic member (640) and the front cover (650) are sequentially arranged in the inner cavity; The top of the valve body (610) is provided with a through air inlet hole (611), the bottom of the elastic member (640) is abutted on the bottom wall of the inner cavity through the front cover (650), and the top of the elastic member (640) is abutted on the ball (620) through the plunger (630); The elastic member (640) is configured to provide an elastic force for moving the ball (620) towards the air inlet hole (611) and blocking the air inlet hole (611); The valve body (610) is provided with an air outlet (612).

8. The internal pressure relief mechanism of scroll compressor according to claim 7, characterized in that: The air outlet (612) penetrates the side wall of the valve body (610), and the air outlet (612) is located at the position of the side wall of the valve body (610) close to the air inlet hole (611); when the ball (620) is away from the air inlet hole (611), the air inlet hole (611) is in communication with the air outlet (612).

9. The internal pressure relief mechanism of scroll compressor according to claim 8, characterized in that: Along the axial direction of the valve body (610), the valve body (610) comprises an upper part (661) and a lower part (662) connected in sequence; the outer diameter of the lower part (662) is smaller than that of the upper part (661); The air inlet hole (611) is arranged in the upper part (661), and the air outlet (612) is arranged at one end of the lower part (662) close to the upper part (661).

10. The internal pressure relief mechanism of scroll compressor according to claim 7, characterized in that: The air outlet (612) penetrates the bottom of the valve body (610); the plunger (630) is provided with a plurality of airflow channels (631), each of which extends along the axial direction of the plunger (630), and a plurality of airflow channels (631) are circumferentially arranged on the plunger (630); A pressure relief air path is formed from the air inlet hole (611), the airflow channels (631) to the air outlet (612).

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