Scroll compressor

Abstract

The present application provides a kind of scroll compressor, pressure regulating pipeline is between exhaust chamber and back pressure chamber, it further includes pressure regulating valve in pressure regulating pipeline, pressure regulating valve includes valve core and elastic component, pressure regulating pipeline includes first airflow passage and second airflow passage, the cross-sectional area of second airflow passage is greater than the cross-sectional area of first airflow passage in airflow flow direction, the second end of elastic component is fixedly arranged in second airflow passage, one end of elastic component is away from exhaust chamber, and throttle flow passage is formed between the outer wall of valve core and the inner wall of first airflow passage, the length of valve core in first airflow passage can be adjusted under the pressure of airflow flowing out of exhaust chamber and the interaction force of elastic component.The present application can make compressor adapt to wider range of operating conditions, improve the application field of compressor, gradually release pressure to make back pressure more stable, prevent the compressor from stopping due to large back pressure fluctuation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of compressor manufacturing, and particularly relates to a scroll compressor. BACKGROUND

[0002] It is known that a carbon dioxide scroll compressor generates a large axial gas force when compressing refrigerant in the pump body, which pushes the moving disc and the fixed disc apart, resulting in an increase in the pump body gap and causing leakage, and in severe cases, the pressure difference cannot be established normally and quickly. Most of the existing technologies adopt a back pressure cavity on the back of the moving disc to form a back pressure to balance the axial gas force. However, how to design the back pressure of the back pressure cavity to ensure balance with the axial gas force is still a difficulty in the industry.

[0003] A one-way regulating valve back pressure pressure regulating structure adopts a one-way valve to regulate the back pressure, but the working condition range adapted by this one-way valve structure is limited, and the back pressure is only provided from the middle compression cavity. For a scroll compressor with a fixed volume ratio, the back pressure supply hole opened at the fixed position of the moving disc can only provide a fixed back pressure under the condition that the suction pressure is unchanged, and a higher back pressure cannot be obtained, so this scheme cannot adapt to a wider range of working conditions. At the same time, the one-way pressure relief ball valve provided in this scheme will instantaneously release pressure when the back pressure reaches the set value, resulting in large back pressure fluctuations and causing the compressor to stop. For a carbon dioxide scroll compressor, the axial gas force is large, that is, the axial force pushing the moving disc and the fixed disc apart is large, and the back pressure required to overcome it is also large, so the structure of the fixed pressure supply from the middle compression cavity cannot meet the actual use requirements. SUMMARY

[0004] Therefore, the present application provides a scroll compressor which can solve the technical problems that the working condition range adapted by the existing one-way valve is limited, and the back pressure is instantaneously released when pressure relief, resulting in large back pressure fluctuations and causing the compressor to stop.

[0005] In order to solve the above problems, the present application provides a scroll compressor having an exhaust cavity and a back pressure cavity, the exhaust cavity and the back pressure cavity have a pressure regulating pipeline therebetween, and further comprising a pressure regulating valve in the pressure regulating pipeline, the pressure regulating valve comprises a valve core and an elastic component, the pressure regulating pipeline comprises a first gas flow channel and a second gas flow channel which are sequentially arranged along the axial direction of the scroll compressor and along the flow direction of the gas flow therein, the cross-sectional area of the second gas flow channel is larger than that of the first gas flow channel in the gas flow direction, one end of the elastic component away from the exhaust cavity and the second end of the elastic component are fixedly arranged in the second gas flow channel, a throttling flow channel is formed between the outer wall of the valve core and the inner wall of the first gas flow channel, and the length of the valve core in the first gas flow channel can be adjusted under the pressure of the gas flow out of the exhaust cavity and the interaction force of the elastic component.

[0006] In some embodiments, the pressure regulating valve further comprises a valve body housing, the first gas flow passage and the second gas flow passage are configured in the valve body housing, the second gas flow passage is configured with a gas outlet at an end of the valve core, and the elastic component is clamped between the valve core and an end face of the gas outlet.

[0007] In some embodiments, the valve body housing is provided with an end cover at one end of the second gas flow passage, the gas outlet is opened on the end cover, and the elastic component is clamped between the end cover and the valve core.

[0008] In some embodiments, the cross section of the second gas flow passage gradually increases in the direction of gas flow.

[0009] In some embodiments, a third gas flow passage is further provided between the second gas flow passage and the end cover, the third gas flow passage is coaxially arranged with the first gas flow passage and the second gas flow passage, the cross section of the third gas flow passage is greater than the maximum cross section of the second gas flow passage in the direction of gas flow.

[0010] In some embodiments, the valve core is provided with a limiting portion on the outer periphery of one end of the second gas flow passage.

[0011] In some embodiments, the valve core is provided with a counterbore at one end of the second gas flow passage, and the first end of the elastic component is arranged in the counterbore; or, the valve core is provided with a convex shaft portion at one end of the second gas flow passage, and the first end of the elastic component is sleeved on the convex shaft portion.

[0012] In some embodiments, the throttling flow passage comprises a threaded flow passage configured on the outer periphery of the valve core, and / or a threaded flow passage configured on the inner wall of the first gas flow passage.

[0013] In some embodiments, the cross section of the threaded flow passage gradually increases in the direction of gas flow.

[0014] In some embodiments, the threaded flow passage sequentially comprises a first threaded flow passage section and a second threaded flow passage section in the direction of gas flow, the cross section of the first threaded flow passage section is smaller than that of the second threaded flow passage section.

[0015] In some embodiments, the threaded flow passage further comprises a third threaded flow passage section, the third threaded flow passage section is located on the side of the second threaded flow passage section away from the first threaded flow passage section, and the cross section of the third threaded flow passage section is greater than that of the second threaded flow passage section.

[0016] In some embodiments, the throttling structure comprises a flow gap formed between the valve core and the inner wall gap of the first gas flow channel.

[0017] In some embodiments, the first gas flow channel is configured with an air inlet at an end of the valve core, a limiting portion is arranged in the first gas flow channel towards the end of the air inlet, and a through hole is formed in the limiting portion; and / or, a filter assembly is arranged on the air inlet.

[0018] In some embodiments, the scroll compressor further comprises a front cover, a moving scroll disc, and a bracket, the front cover is configured with a fourth channel and an exhaust channel, the exhaust channel is in communication with the exhaust cavity, the fourth channel is in communication with the exhaust channel, the bracket has a fifth channel with two ends in communication with the fourth channel and the back pressure cavity respectively, a low pressure cavity is arranged on a side of the bracket away from the moving scroll disc, and the low pressure cavity is in communication with the back pressure cavity through a sixth channel.

[0019] In some embodiments, the pressure regulating valve is arranged in the fourth channel or the fifth channel, and the valve core is arranged in the sixth channel; or, the valve core is arranged in the fourth channel or the fifth channel, and the pressure regulating valve is arranged in the sixth channel.

[0020] In some embodiments, the valve core is arranged in the fifth channel and the sixth channel, and the pressure regulating valve is arranged in the fourth channel.

[0021] The scroll compressor provided by the application is provided with a pressure regulating valve on a pressure regulating pipeline between an exhaust cavity and a back pressure cavity, when the exhaust pressure increases, the valve core moves to a second gas flow channel under the action of the exhaust pressure and against the elastic force of an elastic component, at this time, the length of the first gas flow channel is shortened, the throttling effect is reduced, a larger back pressure value is obtained to adapt to a larger exhaust pressure, the moving scroll disc is pushed to move closer to the static scroll disc to maintain stable operation of the moving scroll disc, the compressor can adapt to a wider range of operating conditions, and the application field of the compressor is improved. In addition, the pressure regulating valve can gradually release pressure when the back pressure is too large, can make the back pressure more stable, and can prevent the compressor from being shut down due to sudden pressure release of a one-way valve and large back pressure fluctuation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a structural schematic diagram of a scroll compressor according to an embodiment of the application;

[0023] Figure 2 FIG. 4 is a partial enlarged view of the fourth channel in FIG. 1; Figure 1

[0024] Figure 3 Figure 1 ​​enlarged view of the sixth channel in the middle;

[0025] Figure 4 a first structure diagram of a valve core of an embodiment of the present application;

[0026] Figure 5 a second structure diagram of a valve core of an embodiment of the present application;

[0027] Figure 6 a third structure diagram of a valve core of an embodiment of the present application;

[0028] Figure 7 a fourth structure diagram of a valve core of an embodiment of the present application;

[0029] Figure 8 a fifth structure diagram of a valve core of an embodiment of the present application;

[0030] Figure 9 a sixth structure diagram of a valve core of an embodiment of the present application;

[0031] Figure 10 a seventh structure diagram of a valve core of an embodiment of the present application;

[0032] Figure 11 a first structure diagram of a valve body shell of an embodiment of the present application;

[0033] Figure 12 a second structure diagram of a valve body shell of an embodiment of the present application;

[0034] Figure 13 a third structure diagram of a valve body shell of an embodiment of the present application;

[0035] Figure 14 a fourth structure diagram of a valve body shell of an embodiment of the present application;

[0036] Figure 15 a fifth structure diagram of a valve body shell of an embodiment of the present application;

[0037] Figure 16 a sixth structure diagram of a valve body shell of an embodiment of the present application;

[0038] Figure 17 a structure diagram of a pressure regulating valve of an embodiment of the present application;

[0039] Figure 18 a structure diagram of a scroll compressor of an embodiment of the present application;

[0040] Figure 19 a structure diagram of a scroll compressor of an embodiment of the present application;

[0041] Figure 20 Fig. 4 is a schematic view of another structure of a scroll compressor according to an embodiment of the present application.

[0042] Reference signs are indicated as follows:

[0043] 11, valve body housing; 12, valve core; 13, elastic component; 14, end cover; 15, filter assembly; 20, front cover; 21, exhaust passage; 22, fourth passage; 23, exhaust cavity; 30, bracket; 31, fifth passage; 32, low-pressure cavity; 33, sixth passage; 40, orbiting scroll; 50, back pressure cavity. DETAILED DESCRIPTION

[0044] Reference is made to Figures 1 to 10 As shown, according to an embodiment of the present application, a scroll compressor is provided, having an exhaust cavity 23 and a back pressure cavity, specifically, the scroll compressor includes a front cover 20, an orbiting scroll 40 and a bracket 30, the back pressure cavity 50 is arranged between the bracket 30 and the orbiting scroll 40, the exhaust cavity 23 is arranged on the front cover 20, and the exhaust cavity 23 and the back pressure cavity 50 have a pressure regulating pipeline therebetween, further including a pressure regulating valve in the pressure regulating pipeline, including a valve core 12 and an elastic component 13, the valve core 12 is arranged in the pressure regulating pipeline, the pressure regulating pipeline includes a first airflow passage and a second airflow passage arranged in sequence along the axial direction of the scroll compressor and along the flow direction of the airflow therein, the projection of the first airflow passage along the axial direction of the scroll compressor falls entirely into the projection of the second airflow passage, that is, the cross-sectional area of the second airflow passage in the flow direction of the airflow is greater than that of the first airflow passage, the first end of the elastic component 13 abuts the end of the valve core 12 away from the exhaust cavity 23, the second end of the elastic component 13 is fixedly arranged in the second airflow passage, and a throttling flow passage is formed between the outer wall of the valve core 12 and the inner wall of the first airflow passage, the length of the valve core 12 in the first airflow passage can be adjusted under the pressure of the airflow flowing out of the exhaust cavity 23 and the interaction force of the elastic component 13, thereby adjusting the throttling length of the throttling flow passage. Specifically, for example, the cross sections of the first airflow passage and the second airflow passage are circular, at this time, the two airflow passages are coaxially arranged to ensure that the valve core 12 can slide along the axial direction of the first airflow passage under the pressure difference at both ends, the cross sections of the first airflow passage and the second airflow passage can also be other suitable shapes, such as rectangular, rhombic, triangular, etc., but it can be clearly seen that the cross-sectional shape of the first airflow passage should match the cross-sectional shape of the valve core 12.

[0045] The pressure regulating valve of the application is arranged in the pressure regulating pipeline between the exhaust cavity and the back pressure cavity, and when the exhaust pressure rises, the pressure regulating valve of the application automatically adjusts the back pressure, so that the back pressure rises accordingly. The pressure regulating valve of the application is applied to the pressure regulating channel of the scroll compressor, and can offset the axial gas force borne by the moving scroll plate 40. The structure makes the compressor adapt to a wider range of working conditions of exhaust pressure. Specifically, when the exhaust pressure is not large, the valve core 12 is in the first gas flow channel with a longer length, the throttling flow passage has a longer length, the throttling effect is larger, and a small back pressure value is obtained to push the moving scroll plate 40 to the static scroll plate. When the exhaust pressure increases, the valve core 12 moves to the second gas flow channel under the action of the exhaust pressure and overcomes the elastic force of the elastic member 13. At this time, the valve core 12 is in the first gas flow channel with a shorter length, the throttling flow passage has a shorter length, the throttling effect is reduced, and a larger back pressure value is obtained to push the moving scroll plate 40 to the static scroll plate, so as to keep the moving scroll plate 40 stable. Through the structure, the compressor can adapt to a wider range of working conditions, and the application field of the compressor is improved. Further, the pressure regulating valve of the application can gradually release pressure when the back pressure is too large, so that the back pressure is relatively stable, and the sudden pressure relief of the one-way valve does not occur, so that the compressor is not stopped due to the large fluctuation of the back pressure.

[0046] In some embodiments, the pressure regulating valve further comprises a valve body shell 11, the first gas flow channel and the second gas flow channel are configured in the valve body shell 11, the first gas flow channel is configured with an air inlet at the end of the valve core 12, the second gas flow channel is configured with an air outlet at the end of the valve core 12, and the elastic member 13 is clamped between the valve core 12 and the end face of the air outlet. The first gas flow channel, the second gas flow channel, the valve core 12 and the elastic member 13 are integrated by the valve body shell 11, which is convenient for installation and later maintenance and replacement.

[0047] For reference Figure 12 , Figure 15 and Figure 16 , in some embodiments, the valve body shell 11 is provided with an end cover 14 at one end towards the second gas flow channel, the air outlet is opened on the end cover 14, and the elastic member 13 is clamped between the end cover 14 and the valve core 12. The end cover 14 is provided to facilitate the installation of the valve core 12 and the elastic member 13 in the valve body shell 11.

[0048] In some embodiments, for reference Figure 14As shown, the cross section of the second airflow passage gradually increases in the airflow flow direction. When the airflow pushes the valve core 12 to move towards the second airflow passage, the throttling effect gradually decreases due to the gradually increasing cross section of the second airflow passage, and a gradually increasing back pressure value that is adapted to the exhaust pressure is obtained to push the orbiting scroll 40 to move towards the fixed scroll. The orbiting scroll 40 is kept stable. Through the structure, the compressor can adapt to a wider range of operating conditions, and the application field of the compressor is improved.

[0049] Referring to Figure 12 and Figure 13 As shown, in some embodiments, a third airflow passage is further provided between the second airflow passage and the end cover 14, the third airflow passage is coaxially arranged with the first airflow passage and the second airflow passage, and the cross-sectional area of the third airflow passage is greater than the maximum cross-sectional area of the second airflow passage in the airflow flow direction. Since the cross sections of the first airflow passage, the second airflow passage and the third airflow passage gradually increase, when the airflow pushes the valve core 12 to move towards the third airflow passage, the throttling effect gradually decreases, and a gradually increasing back pressure value that is adapted to the exhaust pressure is obtained to push the orbiting scroll 40 to move towards the fixed scroll. The orbiting scroll 40 is kept stable. Through the structure, the compressor can adapt to a wider range of operating conditions, and the application field of the compressor is improved.

[0050] Referring to Figure 8 and Figure 9 As shown, in some embodiments, a limiting portion (specifically, for example, a limiting shaft shoulder) is arranged on the outer periphery of one end of the valve core 12 towards the second airflow passage. The limiting portion prevents the valve core 12 from entering the first airflow passage completely under the action of the elastic member 13, and avoids that the valve core 12 cannot adjust the back pressure in the partial stroke range during the movement. Further, the outer periphery of the limiting portion is matched with the shape of the inner wall of the second airflow passage, and the limiting portion is provided with a flow hole or a flow groove, and the airflow flows through the flow hole or the flow groove.

[0051] Referring to Figure 7 and Figure 10 As shown, in some embodiments, a counterbore is arranged at one end of the valve core 12 towards the second airflow passage, and the first end of the elastic member 13 is arranged in the counterbore; or, a convex shaft portion is arranged at one end of the valve core 12 towards the second airflow passage, and the first end of the elastic member 13 is sleeved on the convex shaft portion, which can increase the stability of the connection between the first end of the elastic member 13 and the valve core 12.

[0052] Referring to Figure 4 , Figure 9 , Figure 10 , Figure 12 , Figure 15 , Figure 16 and Figure 17As shown, in some embodiments, the throttling flow passage includes a threaded flow passage configured on the outer periphery of the valve core 12, and / or a threaded flow passage configured on the inner wall of the first gas flow passage. When the gas flow pushes the valve core 12 to move, the length of the threaded flow passage provided on the outer periphery of the valve core 12 in the first gas flow passage can be adjusted, and the back pressure value is further adjusted. Through this structure, the compressor can adapt to a wider range of operating conditions, and the application field of the compressor is improved. Specifically, when the exhaust pressure is not large, the length of the threaded flow passage of the valve core 12 in the first gas flow passage is longer, the throttling effect is larger, a small back pressure value suitable for the exhaust pressure is obtained, so as to push the dynamic scroll plate 40 to the static scroll plate; when the exhaust pressure increases, the valve core 12 overcomes the elastic force of the elastic component 13 under the action of the exhaust pressure, and gradually moves to the second gas flow passage. At this time, the length of the threaded flow passage of the valve core 12 in the first gas flow passage is shortened, the throttling effect is reduced, a larger back pressure value suitable for the larger exhaust pressure is obtained, so as to push the dynamic scroll plate 40 to the static scroll plate, and keep the dynamic scroll plate 40 stable operation. Through this structure, the compressor can adapt to a wider range of operating conditions, and the application field of the compressor is improved.

[0053] In some embodiments, the flow passage cross section of the threaded flow passage gradually increases in the gas flow direction. When the gas flow pushes the valve core 12 to move, the pressure regulating value can be adjusted. Through this structure, the compressor can adapt to a wider range of operating conditions, and the application field of the compressor is improved. It should be noted that in this scheme, when the threaded flow passage is provided on the inner wall of the first gas flow passage, only the first gas flow passage, without the second gas flow passage and the third gas flow passage, can also achieve back pressure regulation.

[0054] Referring to Figure 15 As shown, in some embodiments, the threaded flow passage sequentially includes a first threaded flow passage interval and a second threaded flow passage interval in the gas flow direction, and the flow passage cross section of the first threaded flow passage interval is smaller than that of the second threaded flow passage interval. When the gas flow pushes the valve core 12 to move, the pressure regulating value can be adjusted. Through this structure, the compressor can adapt to a wider range of operating conditions, and the application field of the compressor is improved. It should be noted that in this scheme, when the threaded flow passage is provided on the inner wall of the first gas flow passage, only the first gas flow passage, without the second gas flow passage and the third gas flow passage, can also achieve back pressure regulation.

[0055] Referring to Figure 16As shown, in some embodiments, the threaded flow channel further comprises a third threaded flow channel section, the third threaded flow channel section is located on the side of the second threaded flow channel section away from the first threaded flow channel section, and the flow channel section of the third threaded flow channel section is larger than the flow channel section of the second threaded flow channel section. Since the flow channel section of the third threaded flow channel section is larger than the flow channel section of the second threaded flow channel section, the pressure regulating value can be adjusted when the valve core 12 is moved by the airflow, and through this structure, the compressor can adapt to a wider range of operating conditions, and the application field of the compressor is improved. It should be noted that in the present scheme, when the threaded flow channel is arranged on the inner wall of the first airflow channel, the back pressure regulation can also be realized when there is only the first airflow channel, and there is no second airflow channel and third airflow channel.

[0056] In some embodiments, the throttling structure comprises a flow gap formed between the valve core 12 and the gap between the inner wall of the first airflow channel, and specifically, the valve core 12 and the inner wall of the first airflow channel are gap-fitted, so that the pressure regulating value can be adjusted when the valve core 12 is moved by the airflow, and through this structure, the compressor can adapt to a wider range of operating conditions, and the application field of the compressor is improved.

[0057] In some embodiments, the cross section of the valve core 12 is circular, rectangular, trapezoidal, elliptical, semicircular, triangular, regular polygon, or pentagram, etc., and the shape of the cross section of the first airflow channel and the second airflow channel is adapted to the shape of the cross section of the valve core 12. When the cross section of the valve core 12 is rectangular, trapezoidal, elliptical, semicircular, triangular, regular polygon, or pentagram, etc., which has a rotation stopping structure, the valve core 12 can be prevented from rotating in the circumferential direction, so as to better adjust the pressure regulating value.

[0058] For reference Figure 17 As shown, in some embodiments, the end of the first airflow channel towards the air inlet is provided with a limiting portion, a through hole is formed in the limiting portion to prevent the valve core 12 from extending out of the valve body shell 11 outside under the action of the elastic member 13, and the through hole in the limiting portion forms the air inlet; and / or, a filter assembly 15 is arranged on the air inlet to filter impurities in the airflow.

[0059] In the present embodiment, the end of the first airflow channel towards the air inlet is provided with a limiting portion; and / or, a filter assembly 15 is arranged on the air inlet.

[0060] For reference Figure 1 , Figure 18 , Figure 19 and Figure 20As shown, in some embodiments, the scroll compressor further includes: a front cover 20 and a bracket 30, a back pressure chamber 50 disposed between the bracket 30 and the moving scroll plate 40, an exhaust chamber 23 disposed on the front cover 20, the front cover 20 having a fourth channel 22 and an exhaust channel 21, the exhaust channel 21 being connected to the exhaust chamber 23, the fourth channel 22 being connected to the exhaust channel 21, the bracket 30 having a fifth channel 31 with both ends connected to the fourth channel 22 and the back pressure chamber 50 respectively, and a low pressure chamber 32 disposed on the side of the bracket 30 away from the moving scroll plate 40, the low pressure chamber 32 being connected to the back pressure chamber 50 through a sixth channel 33. In this embodiment, the back pressure source of the back pressure chamber 50 is provided by the exhaust passage 21. Compared with the related technology where the back pressure is only provided by the intermediate compression chamber, for a scroll compressor with a fixed volume ratio, under the condition that the suction pressure remains unchanged, the back pressure supply method opened at the fixed position of the moving scroll plate 40 can only provide a fixed back pressure and cannot obtain a higher back pressure. Therefore, this solution cannot adapt to a wider range of operating conditions. Therefore, the pressure regulating valve of this application can enable the back pressure of the back pressure chamber 50 to be adjusted according to the exhaust pressure, so as to provide a wider range of back pressure and be suitable for a wider range of application conditions.

[0061] See also Figure 1 and Figure 18 As shown, in some embodiments, a pressure regulating valve is provided in the fourth channel 22 or the fifth channel 31, and a valve core 12 is provided in the sixth channel 33; or, a valve core 12 is provided in the fourth channel 22 or the fifth channel 31, and a pressure regulating valve is provided in the sixth channel 33, so as to adapt to the back pressure regulation under different working conditions.

[0062] In addition, pressure regulating valves can be installed in the fourth channel 22, the fifth channel 31 and the sixth channel 33 to adapt to back pressure regulation under different working conditions; or, valve core 12 can be installed in the fourth channel 22 or the fifth channel 31 and pressure regulating valve can be installed in the sixth channel 33 to adapt to back pressure regulation under different working conditions.

[0063] In some embodiments, see Figure 20 As shown, valve cores 12 are installed in the fifth channel 31 and the sixth channel 33. (See also...) Figure 19 As shown, a pressure regulating valve is installed in the fourth channel 22 to adapt to back pressure regulation under different working conditions.

[0064] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0065] The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A scroll compressor having a discharge chamber (23) and a back pressure chamber (50), characterized by, The pressure regulating pipeline is provided between the exhaust cavity (23) and the back pressure cavity (50), and further comprises a pressure regulating valve in the pressure regulating pipeline, the pressure regulating valve comprises a valve core (12) and an elastic component (13), the pressure regulating pipeline has a first gas flow passage and a second gas flow passage arranged in sequence along the axial direction of the scroll compressor and along the flow direction of the gas flow in the pressure regulating pipeline, the cross-sectional area of the second gas flow passage is larger than that of the first gas flow passage in the flow direction of the gas flow, the first end of the elastic component (13) is abutted to the end of the valve core (12) away from the exhaust cavity (23), and the second end of the elastic component (13) is fixedly arranged in the second gas flow passage, a throttling flow channel is formed between the outer wall of the valve core (12) and the inner wall of the first gas flow passage, the length of the valve core (12) in the first gas flow passage can be adjusted under the pressure of the gas flow out of the exhaust cavity (23), the pressure of the back pressure gas flow in the back pressure cavity (50) and the interaction force of the elastic component (13), so as to adjust the throttling length of the throttling flow channel, and the second gas flow passage is communicated with the back pressure cavity (50); the pressure regulating valve further comprises a valve body shell (11), the first gas flow passage and the second gas flow passage are arranged in the valve body shell (11); an end cover (14) is arranged at the end of the valve body shell (11) facing the second gas flow passage, a gas outlet is arranged on the end cover (14), and the elastic component (13) is clamped between the end cover (14) and the valve core (12); the cross section of the second gas flow passage gradually increases in the flow direction of the gas flow, the gas flow out of the exhaust cavity (23) can flow into the valve core (12) from one end of the length of the valve core (12), be throttled through the throttling flow channel and then flow out of the other end of the length of the valve core (12) into the back pressure cavity (50).

2. The scroll compressor of claim 1, wherein A third gas flow passage is further arranged between the second gas flow passage and the end cover (14), the third gas flow passage is coaxially arranged with the first gas flow passage and the second gas flow passage, the cross-sectional area of the third gas flow passage is larger than the maximum cross-sectional area of the second gas flow passage in the flow direction of the gas flow.

3. The scroll compressor of claim 1, wherein A limiting portion is arranged on the outer periphery of the one end of the valve core (12) facing the second gas flow passage.

4. The scroll compressor of claim 1, wherein A counterbore is arranged at the one end of the valve core (12) facing the second gas flow passage, and the first end of the elastic component (13) is arranged in the counterbore; or a convex shaft portion is arranged at the one end of the valve core (12) facing the second gas flow passage, and the first end of the elastic component (13) is sleeved on the convex shaft portion.

5. The scroll compressor of claim 1, wherein, The throttling flow channel comprises a threaded flow channel arranged on the outer periphery of the valve core (12) and / or a threaded flow channel arranged on the inner wall of the first gas flow passage.

6. The scroll compressor of claim 5, wherein, The flow channel cross section of the threaded flow channel gradually increases in the flow direction of the gas flow.

7. The scroll compressor of claim 5, wherein The threaded flow channel comprises a first threaded flow channel section and a second threaded flow channel section in sequence in the flow direction of the gas flow, and the flow channel cross section of the first threaded flow channel section is smaller than that of the second threaded flow channel section.

8. The scroll compressor of claim 7, wherein, The threaded runner further comprises a third threaded runner section located on the side of the second threaded runner section away from the first threaded runner section, and the cross section of the third threaded runner section is larger than that of the second threaded runner section.

9. The scroll compressor of claim 1, wherein, The throttling runner comprises a flow gap formed between the valve core (12) and the inner wall gap of the first gas flow channel.

10. The scroll compressor of claim 1, wherein, The first gas flow channel is configured with an air inlet at the end away from the second gas flow channel, and a limiting portion is arranged in the first gas flow channel towards the end of the air inlet, and a through hole is formed in the limiting portion.

11. The scroll compressor of claim 1, wherein, The first gas flow channel is configured with an air inlet at the end away from the second gas flow channel, and a limiting portion is arranged in the first gas flow channel towards the end of the air inlet, and a through hole is formed in the limiting portion.

12. The scroll compressor of claim 1, wherein, The first gas flow channel is configured with an air inlet at the end away from the second gas flow channel, and a limiting portion is arranged in the first gas flow channel towards the end of the air inlet, and a through hole is formed in the limiting portion.

13. The scroll compressor of claim 1, wherein Further comprising: A front cover (20), a moving scroll (40) and a bracket (30), the fourth channel (22) and the exhaust channel (21) are arranged on the front cover (20), the exhaust channel (21) is communicated with the exhaust cavity (23), the fourth channel (22) is communicated with the exhaust channel (21), the bracket (30) has a fifth channel (31) with two ends communicated with the fourth channel (22) and the back pressure cavity (50) respectively, the low pressure cavity (32) is arranged on the side of the bracket (30) away from the moving scroll (40), and the low pressure cavity (32) is communicated with the back pressure cavity (50) through the sixth channel (33).

14. The scroll compressor of claim 13, wherein, The fourth channel (22) or the fifth channel (31) is provided with the pressure regulating valve, and the sixth channel (33) is provided with the valve core (12); or, the fourth channel (22) or the fifth channel (31) is provided with the valve core (12), and the sixth channel (33) is provided with the pressure regulating valve.

15. The scroll compressor of claim 13, wherein, The fifth channel (31) and the sixth channel (33) are provided with the valve core (12), and the fourth channel (22) is provided with the pressure regulating valve.

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