Scroll compressor with a movable scroll plate assembly

Abstract

The application provides a moving scroll assembly and a scroll compressor with the same. The moving scroll assembly comprises a moving scroll, the moving scroll comprising a base plate, scroll teeth and a mounting seat connected to the two sides of the base plate respectively, a compression chamber formed by the scroll teeth, a mounting chamber of the mounting seat, an operation hole formed in the base plate, a sliding piece arranged in the operation hole, an inlet and an outlet formed on the base plate, one end of the inlet being communicated with the compression chamber or the mounting chamber and the other end being communicated with the operation hole, the operation hole, the outlet and the back pressure chamber being communicated in sequence after the moving scroll assembly is assembled in the compressor, and the sliding piece having an adjusting part with a gradually decreasing cross-sectional area. According to the application, compared with the prior art of setting a related adjusting structure or valve structure in the compressor to adjust the back pressure of the moving scroll, the application can effectively adjust the back pressure of the moving scroll by simply modifying the base plate of the moving scroll and adding a small number of simple components.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of compressors, and particularly relates to a dynamic scroll plate assembly and a scroll compressor with the same. BACKGROUND

[0002] When the scroll compressor operates at high speed, the overturning moment of the pump body will be greatly increased due to the centrifugal force, which brings the risk of leakage and increases the risk of compressor wear, and adversely affects the performance of the compressor. In order to solve this problem, it is necessary to adjust the back pressure of the dynamic scroll plate during the operation of the compressor. At present, there are several methods to adjust the back pressure of the dynamic scroll plate. The first method is to dynamically adjust the fluid flow from the discharge chamber to the back pressure chamber through the pressure difference between the discharge chamber and the suction chamber, so that the scroll compressor can obtain the desired back pressure when operating at a lower discharge pressure and a higher discharge pressure, which can effectively improve the performance of the scroll compressor. The second method is to fix the magnetic circuit core on the dynamic scroll plate and the static scroll plate, and set multiple excitation structures, and use electromagnetic force to offset the gas force between the dynamic scroll plate and the static scroll plate, so that the back pressure of the pump body is kept in a small fluctuation range, and the performance of the scroll compressor under high frequency working condition is improved. The third method is to set a capacity automatic control structure and related valve structure in the scroll compressor, so as to control the back pressure of the scroll compressor in a reasonable range and improve the performance of the scroll compressor under high frequency working condition. The above three methods all need to set related adjusting structure or valve structure in the scroll compressor, which makes the design of the compressor more complex and the cost of the compressor increases significantly. SUMMARY

[0003] Therefore, the present application provides a dynamic scroll plate assembly which can overcome the problem that in order to adjust the back pressure of the dynamic scroll plate during the operation of the scroll compressor, it is necessary to set related adjusting structure or valve structure in the compressor, which makes the design of the compressor more complex.

[0004] In order to solve the above problems, the present application provides a dynamic scroll plate assembly, which comprises: a dynamic scroll plate, the dynamic scroll plate comprising a base plate, a scroll tooth and a mounting seat connected to both sides of the base plate respectively, a compression chamber formed by the scroll tooth, the mounting seat having a mounting chamber, an operation hole formed in the base plate, an inlet and an outlet formed on the base plate, the first end of the inlet being in communication with the compression chamber or the mounting chamber, the second end of the inlet being in communication with the operation hole, the outlet being opposite to the scroll tooth, the first end of the outlet being in communication with the operation hole, the second end of the outlet being in communication with a back pressure chamber after the dynamic scroll plate assembly is assembled in the compressor, a sliding member being arranged in the operation hole, the sliding member being in clearance fit with the operation hole, the sliding member having an adjusting part, the cross-sectional area of the adjusting part gradually decreasing from the outer circumferential surface of the base plate to the inlet, and the sliding member being capable of moving in the operation hole under the action of centrifugal force.

[0005] In some embodiments, the operation hole comprises a first matching hole, the first matching hole is communicated with the compression chamber through the inlet, the shape of the first matching hole matches the shape of the adjusting part, and the adjusting part is inserted into the first matching hole.

[0006] In some embodiments, the slider has an initial position in the operation hole, when the slider is in the initial position, the cross sections of the adjusting part and the first matching hole at the corresponding positions are respectively a first circle and a second circle, the diameter of the first circle is D1, the diameter of the second circle is D2, and 0.06mm≤D2-D1≤0.1mm.

[0007] In some embodiments, the adjusting part is a conical structure, any generatrix on the adjusting part forms an included angle θ with the center line of the adjusting part, and 10°≤θ≤40°.

[0008] In some embodiments, the operation hole further comprises a second matching hole, the inlet, the first matching hole, the second matching hole and the outlet are communicated in sequence, the slider further has a through part connected with the adjusting part, the through part is a cylindrical structure, the shape of the through part matches the shape of the second matching hole, the through part is in the second matching hole, and the position of the through part corresponds to the position of the outlet.

[0009] In some embodiments, the cross section of the through part is a third circle, the diameter of the third circle is D3, the cross section of the second matching hole is a fourth circle, the diameter of the fourth circle is D4, and 0.2mm≤D4-D3≤0.6mm.

[0010] In some embodiments, the operation hole has an opening on the outer circumferential surface of the base plate, a blocking part blocking the opening is installed at the opening, an elastic part is connected to the blocking part, and the elastic part is clamped between the blocking part and the through part.

[0011] In some embodiments, the operation hole has an opening on the outer circumferential surface of the base plate, a blocking part blocking the opening is installed at the opening, an elastic part is arranged in the first matching hole, one end of the elastic part is connected with the adjusting part, the other end of the elastic part is connected with the side wall of the first matching hole, and the elastic part is between the adjusting part and the inlet.

[0012] The application also provides a scroll compressor comprising the above-mentioned orbiting scroll assembly.

[0013] The application provides a dynamic scroll assembly and a scroll compressor with the same, when the scroll compressor is operated at a low speed, the overturning moment of the pump body is small, the dynamic scroll does not need a large back pressure, the centrifugal force on the sliding member is small, the sliding member moves outward in the operation hole with a small stroke, the adjusting part is basically in the initial position, the high-pressure gas in the compression chamber or the mounting chamber passes through the gap between the sliding member and the operation hole, throttles to a proper intermediate pressure, and then enters the back pressure cavity, the back pressure cavity provides a small back pressure to improve the overturning of the pump body; when the scroll compressor is operated at a high speed, under the action of a large centrifugal force, the sliding member moves outward in the operation hole with a large stroke, the position of the adjusting part in the operation hole changes greatly, the adjusting part is far away from the inlet, the throttling effect on the refrigerant gas is reduced, the gas pressure introduced into the back pressure cavity is increased, the back pressure of the dynamic scroll is increased, and the overturning degree of the pump body is greatly reduced, the sealing performance is improved, the wear risk is reduced, and the high-speed operation performance of the compressor is improved. Compared with the related adjusting structure or valve structure arranged in the compressor in the prior art to adjust the back pressure of the dynamic scroll, the back pressure of the dynamic scroll can be effectively adjusted by simply reforming the base plate of the dynamic scroll on the premise of adding a small number of simple components. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a sectional view of a dynamic scroll assembly in an initial state according to an embodiment of the application;

[0015] Figure 2 FIG. 2 is a sectional view of a dynamic scroll assembly in an initial state according to another embodiment of the application;

[0016] Figure 3 FIG. 3 is a sectional view of a dynamic scroll according to an embodiment of the application;

[0017] Figure 4 FIG. 4 is a sectional view of a dynamic scroll according to another embodiment of the application;

[0018] Figure 5 FIG. 5 is a structural schematic view of a sliding member according to an embodiment of the application;

[0019] Figure 6 FIG. 6 is a structural schematic view of a sealing member and an elastic member according to an embodiment of the application;

[0020] Figure 7 FIG. 7 is a sectional view of a scroll compressor according to an embodiment of the application.

[0021] The reference signs are as follows:

[0022] 1, compression chamber; 2, mounting chamber; 3, orbiting scroll; 31, base plate; 32, scroll tooth; 33, mounting seat; 4, operation hole; 41, first matching hole; 42, second matching hole; 5, sliding piece; 51, adjusting part; 52, straight-through part; 6, inlet; 7, outlet; 8, elastic part; 9, plugging piece; 10, shell; 11, fixed scroll; 12, upper support; 13, main bearing; 14, stator; 15, crankshaft; 16, auxiliary bearing; 17, lower cover; 18, cross slip ring; 19, upper cover; 20, back pressure chamber. DETAILED DESCRIPTION

[0023] BRIEF DESCRIPTION OF DRAWINGS Figures 1 to 7 As shown in the drawings, according to the embodiment of the present application, a kind of orbiting scroll assembly is provided, comprising: orbiting scroll 3, orbiting scroll 3 includes base plate 31 and the scroll tooth 32 and mounting seat 33 respectively connected in the both sides of base plate 31, scroll tooth 32 is enclosed space and forms compression chamber 1, mounting seat 33 has mounting chamber 2, base plate 31 is configured with operation hole 4, base plate 31 is also configured with inlet 6 and outlet 7, the first end of inlet 6 is communicated with compression chamber 1 or mounting chamber 2, the second end of inlet 6 is communicated with operation hole 4, outlet 7 is back to scroll tooth 32, the first end of outlet 7 is communicated with operation hole 4, after orbiting scroll assembly is assembled in compressor, the second end of outlet 7 is communicated with back pressure chamber 20, sliding piece 5 is arranged in operation hole 4, sliding piece 5 is clearance fit with operation hole 4, sliding piece 5 has adjusting part 51, from the direction of the outer circumferential side of base plate 31 to inlet 6, the cross-sectional area of adjusting part 51 gradually decreases, sliding piece 5 can move in operation hole 4 under the action of centrifugal force.In the technical scheme, the pump body of scroll compressor is mainly composed of fixed scroll 11 and orbiting scroll 3, fixed scroll 11 and orbiting scroll 3 are oppositely installed on upper support 12 with phase angle difference of 180 degrees, orbiting scroll 3 is driven by crankshaft 15 and is meshed with fixed scroll 11 to form a series of crescent-shaped compression chambers 1 isolated from each other and gradually changing in volume.At the same time, orbiting scroll 3 has axial flexibility, i.e. there is back pressure chamber 20 between orbiting scroll 3 and upper support 12, which is intermediate pressure between suction pressure and exhaust pressure, such as Figure 7The inlet 6 on the base plate 31 is close to the high pressure area of the compression chamber 1 or the mounting chamber 2, the adjusting part 51 is the front half of the sliding piece 5, which is between the inlet 6 and the outlet 7, and the operation hole 4 extends along the radial direction of the base plate 31. During the operation of the compressor, the gas pressure in the back pressure chamber 20 is used to ensure that the orbiting scroll 3 is floatingly attached to the fixed scroll 11, so as to ensure the axial sealing between the orbiting scroll and the fixed scroll and prevent overturning. When the scroll compressor operates at low speed, the overturning torque of the pump body is small, and the orbiting scroll 3 does not need a large back pressure. At this time, the centrifugal force acting on the sliding piece 5 is small, the sliding piece 5 moves outward in the operation hole 4 with a small stroke, so that the adjusting part 51 is basically in the initial position, and the high pressure gas in the compression chamber 1 or the mounting chamber 2 throttles through the gap between the sliding piece 5 and the operation hole 4 to enter the back pressure chamber 20, and the back pressure chamber 20 provides a small back pressure to improve the overturning of the pump body; when the scroll compressor operates at high speed, under the action of a large centrifugal force, the sliding piece 5 moves outward in the operation hole 4 with a large stroke, so that the position of the adjusting part 51 in the operation hole 4 changes greatly, the adjusting part 51 is away from the inlet 6, and thus the throttling effect of the refrigerant gas is reduced, the gas pressure introduced into the back pressure chamber 20 is increased, the back pressure of the orbiting scroll 3 is increased, and thus the overturning degree of the pump body is greatly reduced, the sealing performance is improved, the risk of wear is reduced, and the high speed operation performance of the compressor is improved. Compared with the prior art which sets a related adjusting structure or valve structure in the compressor to adjust the back pressure of the orbiting scroll 3, the base plate 31 of the orbiting scroll 3 is simply modified, and the back pressure of the orbiting scroll 3 can be effectively adjusted on the premise of adding a small number of simple components. Among them, the high pressure refrigerant gas compressed by the pump body fills the entire shell 10 of the compressor, although one end of the crankshaft 15 is installed in the mounting chamber 2, the crankshaft 15 does not fill the mounting chamber 2, and a small amount of space is still left in the mounting chamber 2. The remaining space in the mounting chamber 2 is also filled with high pressure refrigerant gas after compression, so the gas introduced from the mounting chamber 2 into the back pressure chamber 20 is also high pressure gas, and the back pressure at this time is basically equal to the exhaust pressure, and the sealing and anti-overturning effect of the high speed pump body of the compressor is more obvious.

[0024] For reference Figure 1 and Figure 3As shown, the operation hole 4 comprises a first matching hole 41 which is communicated with the compression chamber 1 through the inlet 6, and the first matching hole 41 is matched with the shape of the adjusting part 51 which is inserted into the first matching hole 41. When the compressor is operated at low speed, the centrifugal force on the sliding part 5 is small, the adjusting part 51 is basically in the initial position, the gap between the adjusting part 51 and the first matching hole 41 is small, the throttling effect on the refrigerant gas is good, and thus the gas pressure entering the back pressure chamber 20 through the outlet 7 is small, which can prevent the overturning of the pump body at low speed. When the scroll compressor is operated at high speed, the centrifugal force on the sliding part 5 is large, the moving stroke of the sliding part 5 is large, the position of the adjusting part 51 in the operation hole 4 is changed greatly, and thus the gap between the adjusting part 51 and the operation hole 4 is significantly increased, and thus the throttling effect on the refrigerant gas is significantly reduced, the gas pressure entering the back pressure chamber 20 through the outlet 7 is large, and the back pressure of the orbiting scroll 3 is significantly increased, which can prevent the overturning of the pump body at high speed. The structure of the first matching hole 41 makes the gas pressure difference entering the back pressure chamber 20 at low speed and high speed of the compressor be large, which can better prevent the overturning of the pump body at low speed and high speed.

[0025] In the embodiment, the sliding part 5 has an initial position in the operation hole 4, and when the sliding part 5 is in the initial position, the cross sections of the adjusting part 51 and the first matching hole 41 at the corresponding positions are respectively a first circle and a second circle, the diameter of the first circle is D1, and the diameter of the second circle is D2. When 0.06mm≤D2-D1≤0.1mm, the throttling effect of the adjusting part 51 cooperating with the operation hole 4 is better at low speed of the compressor, which is beneficial to introducing low pressure gas into the back pressure chamber 20, and the gap between the adjusting part 51 and the operation hole 4 is significantly increased at high speed of the compressor, which is beneficial to introducing high pressure gas into the back pressure chamber 20.

[0026] For reference Figure 5 As shown, the adjusting part 51 is in a conical structure, and any generatrix on the adjusting part 51 forms an angle θ with the center line of the adjusting part 51. When 10°≤θ≤40°, the throttling effect can be further improved at low speed of the compressor, which is more beneficial to introducing low pressure gas into the back pressure chamber 20, and the throttling effect is further reduced at high speed of the compressor, which is more beneficial to introducing high pressure gas into the back pressure chamber 20.

[0027] For reference Figure 5As shown, the operation hole 4 further comprises a second matching hole 42, the inlet 6, the first matching hole 41, the second matching hole 42 and the outlet 7 are sequentially communicated, the sliding member 5 further has a straight-through part 52 connected with the adjusting part 51, the straight-through part 52 is in a cylindrical structure, the shape of the straight-through part 52 matches the shape of the second matching hole 42, the straight-through part 52 is in the second matching hole 42, and the position of the straight-through part 52 corresponds to the position of the outlet 7. Regardless of the low or high speed operation of the compressor, the sliding member 5 is in the initial position or produces a large moving stroke in the operation hole 4, the gap between the straight-through part 52 and the second matching hole 42 is always unchanged, which makes the throttling effect of the two on the refrigerant always unchanged, so that the refrigerant gas pressure entering the back pressure cavity 20 from the outlet 7 can be more stably controlled.

[0028] Specifically, the cross section of the straight-through part 52 is a third circle, the diameter of the third circle is D3, the cross section of the second matching hole 42 is a fourth circle, and the diameter of the fourth circle is D4. When 0.2mm≤D4-D3≤0.6mm, the control effect of the straight-through part 52 and the second matching hole 42 on the refrigerant gas is better.

[0029] In the embodiment, the operation hole 4 is formed by opening a hole from the outer circumferential surface of the substrate 31, leaving an opening on the outer circumferential surface of the substrate 31, and the sliding member 5 is installed into the operation hole 4 from the opening. The operation hole 4 further comprises an elastic member 8 configured to apply an elastic force to the sliding member 5, and the sliding member 5 changes position under the combined action of the centrifugal force and the elastic force. The addition of the elastic member 8 enables the sliding member 5 to automatically reset.

[0030] As an embodiment, the operation hole 4 further comprises a blocking member 9 blocking the opening, the blocking member 9 is located outside the sliding member 5 along the radial direction of the substrate 31, the elastic member 8 is connected to the blocking member 9, and the elastic member 8 is clamped between the blocking member 9 and the straight-through part 52 of the sliding member 5. When the compressor operates at a high speed, the centrifugal force acting on the sliding member 5 is greater than the elastic force of the elastic member 8, the elastic member 8 is compressed, and the sliding member 5 produces a long moving stroke outwardly in the operation hole 4; when the compressor operates at a low speed, the centrifugal force acting on the sliding member 5 is smaller than the elastic force of the elastic member 8, the elastic member 8 rebounds under the action of its own elastic force and pushes the sliding member 5 back to the initial position.

[0031] As an example two, the sealing member 9 is still installed in the operation hole 4 to seal the opening of the operation hole 4, but the position of the elastic member 8 is changed, one end of the elastic member 8 is connected with the adjusting part 51, the other end is connected with the side wall of the first matching hole 41, and the elastic member 8 is between the adjusting part 51 and the inlet 6. When the compressor is operated at high speed, the centrifugal force of the sliding member 5 is greater than the elastic force of the elastic member 8, the elastic member 8 is stretched, and the sliding member 5 has a long moving stroke outwardly in the operation hole 4; when the compressor is operated at low speed, the centrifugal force of the sliding member 5 is smaller than the elastic force of the elastic member 8, the elastic member 8 is contracted under the action of the elastic force of itself, and the sliding member 5 is pulled back to the initial position.

[0032] The present application also provides a scroll compressor comprising the above-mentioned orbiting scroll assembly. The scroll compressor further comprises a main bearing 13, a stator 14, a secondary bearing 16, a lower cover 17, a cross slip ring 18 and an upper cover 19, etc., as shown in Figure 7

[0033] It is easily understood by those skilled in the art that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0034] The above only is the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application. The above is only the preferred embodiment of the present application, it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can also be considered as the protection scope of the present application.​

Claims

1. A scroll orbiting assembly comprising: The moving scroll (3) comprises a base plate (31), scroll teeth (32) and a mounting seat (33) connected to both sides of the base plate (31) respectively, the scroll teeth (32) enclose a space to form a compression chamber (1), the mounting seat (33) has a mounting chamber (2), the base plate (31) is internally provided with an operation hole (4), the base plate (31) is further provided with an inlet (6) and an outlet (7), a first end of the inlet (6) is communicated with the compression chamber (1) or the mounting chamber (2), a second end of the inlet (6) is communicated with the operation hole (4), the outlet (7) is opposite to the scroll teeth (32), a first end of the outlet (7) is communicated with the operation hole (4), after the moving scroll assembly is assembled in a compressor, a second end of the outlet (7) is communicated with a back pressure chamber (20), a sliding member (5) is arranged in the operation hole (4), the sliding member (5) is in clearance fit with the operation hole (4), the sliding member (5) has an adjusting part (51), from the direction of the outer circumferential surface of the base plate (31) to the inlet (6), the cross-sectional area of the adjusting part (51) gradually decreases, under the action of centrifugal force, the sliding member (5) can move in the operation hole (4); The operation hole (4) comprises a first fit hole (41), the first fit hole (41) is communicated with the compression chamber (1) through the inlet (6), the shape of the first fit hole (41) is matched with the shape of the adjusting part (51), the adjusting part (51) is inserted in the first fit hole (41); The sliding member (5) further has a straight-through part (52) connected with the adjusting part (51), the operation hole (4) has an opening on the outer circumferential surface of the base plate (31), the opening is provided with a blocking member (9) for blocking the opening, the blocking member (9) is connected with an elastic member (8), and the elastic member (8) is clamped between the blocking member (9) and the straight-through part (52); or, the operation hole (4) has an opening on the outer circumferential surface of the base plate (31), the opening is provided with a blocking member (9) for blocking the opening, the first fit hole (41) is provided with an elastic member (8), one end of the elastic member (8) is connected with the adjusting part (51), the other end of the elastic member (8) is connected with the side wall of the first fit hole (41), and the elastic member (8) is between the adjusting part (51) and the inlet (6).

2. The orbiting scroll assembly of claim 1, wherein The sliding member (5) has an initial position in the operation hole (4), when the sliding member (5) is in the initial position, the cross sections of the corresponding positions of the adjusting part (51) and the first fit hole (41) are a first circle and a second circle respectively, the diameter of the first circle is D1, the diameter of the second circle is D2, and 0.06mm≤D2-D1≤0.1mm.

3. The orbiting scroll assembly of claim 1 wherein, The adjusting part (51) is a conical structure, and an included angle θ is formed between any generatrix on the adjusting part (51) and a center line of the adjusting part (51), 10°≤θ≤40°.

4. The orbiting scroll assembly of claim 1 wherein, The operation hole (4) further comprises a second matching hole (42), the inlet (6), the first matching hole (41), the second matching hole (42), and the outlet (7) are sequentially communicated, the straight-through part (52) is a cylindrical structure, a shape of the straight-through part (52) is matched with a shape of the second matching hole (42), the straight-through part (52) is located in the second matching hole (42), and a position of the straight-through part (52) corresponds to a position of the outlet (7).

5. The orbiting scroll assembly of claim 4 wherein, A cross section of the straight-through part (52) is a third circle, a diameter of the third circle is D3, a cross section of the second matching hole (42) is a fourth circle, a diameter of the fourth circle is D4, and 0.2mm≤D4-D3≤0.6mm.

6. A scroll compressor characterized by A motorized scroll assembly comprising any one of claims 1 to 5.

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