[0032] Example one
[0033] Referring to Figure 1, the compressor provided in this embodiment includes a sealed housing 2 in which a high and low pressure partition plate 21 is provided, and a fixed scroll 3 is provided under the high and low pressure partition plate 21 and cooperates with the fixed scroll 3 In order to realize the floating sealing function of the sealing cover 4 and the sealing rings 51, 52, 53, the movable scroll 6 installed opposite to the fixed scroll 3 is arranged below the fixed scroll 3, so that the two scrolls have a suction pressure zone 300 and a discharge pressure zone. A compression chamber with a gradually changing volume is generated between 400 and the sealed housing 2 is provided with a bearing seat 7 for installing the fixed scroll 3 and making it have limited axial movement relative to the movable scroll 6, and the bottom of the movable scroll 6 is with The crankshaft 8 is matched, the crankshaft 8 is matched with the motor assembly 9, the crankshaft 8 and the motor assembly 9 are used to drive the orbiting scroll 6 to revolve around the center axis of the fixed scroll, and the fixed scroll 3 and the movable scroll 6 are respectively operable with the anti-rotation mechanism 10 The ground fit is used to prevent the orbiting scroll 6 from rotating, and to maintain the relative angular relationship between the moving and static scrolls. The floating sealing device formed by the sealing cover 4 of the stationary scroll 3 and the sealing rings 51, 52, and 53 will be described in detail below with reference to Figs. 2, 3 and 4.
[0034] As shown in Fig. 2, the fixed scroll 3 has an end plate 30 and a scroll 35 integrally formed below. The end plate 30 is provided with a discharge channel 301 and a discharge hole 302 that penetrate up and down, and the top of the end plate 30 is provided with a boss. The boss is a two-stage boss, which is formed by a first-stage boss 31 and a second-stage boss 32. The side walls of the first-stage boss 31 and the second-stage boss 32 are both provided with sealing ring installation positions, Used to facilitate the installation of sealing rings 51 and 52.
[0035] As shown in FIG. 3, the center of the sealing cover 4 is provided with a discharge hole 402 that penetrates up and down, and the bottom is provided with a groove. The groove is a two-stage groove formed by a first-stage groove 41 and a second-stage groove 42. The size and shape of the groove are matched with the above-mentioned second-stage boss, so that the upper end portion of the first-stage boss 31 and the upper end portion of the second-stage boss 32 can be respectively embedded in the first-stage groove 41 and the second-stage boss. In the groove 42, a closed groove 43 is opened at the top of the sealing cover 4.
[0036] As shown in FIGS. 2 and 3 and 4, the sealing cover 4 is installed on the top of the fixed scroll 3, so that the first step boss 31 and the second step boss 32 at the top of the fixed scroll 3 are partially embedded in the bottom of the sealing cover 4, respectively The first-stage groove 41 and the second-stage groove 42 are formed, so that a middle-pressure cavity 100 is formed between the top surface of the first-stage boss 31 and the bottom surface of the first-stage groove 41. It communicates with the compression chamber defined by the movable scroll 6 and the fixed scroll 3 through the discharge channel 301 opened on the fixed scroll, and the first sealing ring 51 is arranged on the side wall of the first-stage boss 31 and the first-stage groove 41 In order to isolate the intermediate pressure chamber 100 from the suction pressure zone 300, the second sealing ring 52 is arranged between the side wall of the second step boss 32 and the side wall of the second step groove 42, thereby Separate the medium pressure chamber 100 from the discharge pressure zone 400, the third sealing ring 53 is arranged in the groove 43 opened at the top of the sealing cover 4, and the third sealing ring 53 can be sealed upwardly with the high and low pressure partition plate 21, thereby When the sealing cover 4 axially floats to a first position, the suction pressure zone 300 is separated from the discharge pressure zone 400, so that when the sealing cover 4 axially floats to a second position, the suction pressure zone 300 and the discharge pressure zone 400 Connected.
[0037]The above-mentioned intermediate pressure chamber 100 is connected by the discharge channel 301 and the compression chamber, thereby introducing the pressure Pz of the intermediate compression chamber, which acts on the bottom of the sealing cover 4, and the top of the sealing cover 4 is divided into two areas by the sealing ring 53. The outside is affected by the suction pressure Ps, and the inside is affected by the exhaust pressure Pd. At any time, the gas pressure acting on the sealing cover 4 and the force acting on the sealing cover through the high and low pressure separator 21 are in a balanced state; in addition, the static vortex In addition to the force of the compression chamber gas, the outer edge of the disk 3 is affected by the suction pressure Ps, the central part is affected by the exhaust pressure Pd, and the part covered by the sealing cover is affected by the intermediate pressure chamber Pz. All these forces make the static vortex The axial sealing force of the disc 3 is in a balanced state.
[0038] The balance of the above-mentioned sealing cover and the balance of the fixed scroll form the axial double balance of the compressor provided in this embodiment. This kind of axial double balance keeps the axial sealing force of the moving and static scroll scrolls in a dynamically adjustable balance state, which can avoid two situations:
[0039] (1) Excessive axial sealing force increases friction, increases power consumption, and shortens the life of parts;
[0040] (2) Insufficient axial sealing force results in blow-by in the compression chamber, which reduces the energy efficiency ratio.
[0041] The above-mentioned floating sealing device also has the following advantages: it can play a good role in protecting vacuum conditions such as reversal and air intake blockage, that is, when the above-mentioned conditions occur, the sealing cover 4 floats to the second position, and the seal is now sealed. The ring 53 loses its function, so that the fluid discharged from the pressure zone 400 can leak into the suction pressure zone 300, which can prevent the formation of a high vacuum on the inlet side of the compressor and generate a destructive force that pulls the two scrolls together. . In addition, when hydraulic pressure occurs, the fixed scroll floats upward and separates from the movable scroll, thereby expelling the liquid in the compression chamber.
