CN1084441C - Backpressure cavity sealing device of vortex compressor - Google Patents

Abstract

The invention discloses a scroll compressor with a back pressure cavity sealing device, which comprises a non-revolving scroll and an orbiting scroll; a circular slider accommodated in the shaft hub of the orbiting scroll; a A rotatably supported main shaft combined with the above-mentioned round slider; a support body having two ring-shaped sealing end surfaces except for cooperating with the journal of the above-mentioned main shaft to support the main shaft. An annular groove is arranged on the second annular end surface of the support body, and a sealing gasket is installed in the annular groove; a sealing member is installed between the inner hole of the circular slider and the lubricating oil chamber surrounded by the end surface and the high-pressure back pressure chamber. The invention has the characteristics of simple structure, good processability and reliable use of the sealing device.

Description

Scroll compressor with back pressure chamber seal

The invention relates to a scroll compressor with a back pressure cavity sealing device.

Patent application number CN1060699A discloses a volute machine with a floating sealing device. It is provided with an annular groove on the upper end surface of the non-orbiting scroll (that is, the non-revolving scroll), in which three annular members and two sets of seals (or two annular members and two sets of seals) are placed in the annular groove. A set of seals) constitutes a multi-functional floating sealing device. The sealing lip and the wear-resistant ring on the partition plate of the cylinder are set on the uppermost surface of the sealing assembly to form a top seal. Several seals respectively complete the low-pressure suction chamber and the back The isolation seal between the pressure chamber, the back pressure chamber and the high-pressure exhaust chamber, the high-pressure exhaust chamber and the low-pressure suction chamber. This patent can be called the upper-mounted back pressure chamber design of the scroll compressor. In the design of the upper-mounted back pressure chamber, it is necessary to specially set up the guide rail that the trackless scroll is axially offset from the orbiting scroll (that is, the orbiting scroll), and the combined seal requires a large number of parts and a complex structure. The reliability of the top seal, under the action of the fluid pressure in the back pressure chamber, the trackless volute will inevitably press the end plate of the orbital volute, and then make the orbital volute tightly pressed against the main bearing housing (that is, the bracket body) ring end face. Causes greater friction and power loss.

The object of the present invention is to provide a scroll compressor with a back pressure chamber sealing device which is simple in structure, reliable in use, and can reduce friction and power loss between the orbiting scroll and the support body.

The purpose of the present invention is achieved in that the present invention includes: a non-revolving scroll and an orbiting scroll; a circular slider accommodated in the hub of the orbiting scroll; a circular slider combined with the above-mentioned circular slider A rotatably supported main shaft; a support body having two ring-shaped sealing end faces in addition to cooperating with the shaft journal of the above-mentioned main shaft to support the main shaft. An annular groove is arranged on the second annular end surface of the support body, and a sealing gasket is installed in the annular groove; a sealing element is installed between the inner hole of the circular slider and the lubricating oil chamber surrounded by the end surface and the high-pressure back pressure chamber.

The bottom of the annular groove is provided with an air path composed of several small holes communicating with the high-pressure back pressure chamber.

The cross-section of the gasket installed in the annular groove is "П" shape.

The sealing member is provided with an adjusting sealing gasket containing an incomplete circular inner hole with a straight edge; the shape of the inner edge surface of the incomplete circular inner hole is corresponding to the shape of the incomplete cylindrical outer edge surface of the crank throw; The sealing gasket is nested on the outer side of the crank throw of the main shaft, and is axially installed under the circular slider. There is a gap between the second end surface of the sealing gasket and the corresponding end surface of the bracket body, and the second end surface of the adjusting sealing gasket There is only one layer of lubricating oil film between one end face and the corresponding end face of the round slider.

Since the present invention adopts a design technology of the lower back pressure chamber which is different from the combined floating seal of the prior art, different sealing elements are used to complete the sealing isolation between the low pressure back pressure chamber and the high pressure back pressure chamber and the high pressure back pressure chamber and the high pressure back pressure chamber respectively. The seal between the lubricating oil chambers is isolated, and a low-pressure back-pressure chamber is added between the suction chamber and the back-pressure chamber of the compressor (that is, the high-pressure back-pressure chamber), so that there will be no flow from the high-pressure back-pressure chamber to the suction chamber. Direct leakage, thus reducing the gas leakage between different pressure chambers and the power loss of the whole machine, and effectively improving the reliability of the seal with the help of the compensation function of the sealing element. These sealing elements are simple in structure, good in processability and reliable in use. In addition, two other advantages of the present invention are: there is no need to specially set guide rails for the axial displacement of the orbiting scroll; The end plate of the rotating disk is compressed, so that the friction between the orbiting scroll and the support body is reduced, and the power loss is also small.

The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

FIG. 1 is an axial sectional view of a scroll compressor in Embodiment 1. FIG.

Fig. 2 is an axial sectional view of the bracket body.

Figure 3 is an axial sectional view of a П-shaped pad.

Figure 4 is an attached view of the adjusting gasket.

Fig. 5 is an axial sectional view of the adjusting gasket.

FIG. 6 is an axial sectional view of a scroll compressor in Embodiment 2. FIG.

Fig. 7 is a top view of the gasket.

Fig. 8 is an axial sectional view of the gasket.

Referring to FIG. 1 , the back pressure chamber sealing device used in Embodiment 1 of the present invention is a П-shaped gasket 60 and an adjusting sealing gasket 70 . In FIG. 1 , the scroll compressor 5 is composed of a non-revolving scroll 10 and an orbiting scroll 20 , a slider 30 , a main shaft 40 , a support body 50 and other parts. The non-orbiting scroll 10 has a first spiral wrap 10-1 protruding outward from an end plate, which intersects with a second spiral wrap 20-1 on the orbiting scroll 20, thereby defining a plurality of continuous A moving fluid chamber; on the second end surface of the end plate on the orbiting scroll 20, there is an outwardly protruding shaft hub 20-2, the outer edge surface of the round slider 30 is a cylindrical surface, and the inner hole is a The non-round hole with straight sides, the round slider 30 is accommodated in the hub of the above-mentioned orbiting scroll, which can not only rotate relative to the orbiting scroll, but also move relative to the axial direction; on the journal 40 of the main shaft 40- On the first end surface of 1, there is an eccentric crank throw 40-2, which extends axially from the second end surface of the journal and is fixed with the motor rotor 90. The outer edge surface of the crank throw is a non-straight edge. The complete cylindrical surface (not shown in the figure) is accommodated in a non-circular hole with a straight edge of the above-mentioned circular slider, which can move relative to the circular slider along the straight edge and along the axial direction, and the lubricating oil passes through the main The oil transfer hole 40-3 is drawn from the end of the crank throw, and lubricates the inner and outer edge cylindrical surfaces of the circular slider at the same time; referring to Fig. Annular sealing end faces 50-11 and 50-12, the outermost annular end face 50-11 is consolidated with the corresponding annular end face on the above-mentioned non-revolving scroll, so that the high-pressure exhaust chamber 5-1 in the cylinder and the scroll The low-pressure back pressure chamber 5-2 of the compressor is isolated, and the second annular end surface 50-12 close to the inner side cooperates with the orbiting scroll end plate for revolving motion to divide the back pressure chamber into two back pressure chambers of high and low pressure. It is a low-pressure back pressure chamber 5-2, and the inner side is a high-pressure back pressure chamber 5-3. The lubricating oil chamber 5-4 is surrounded by a round slider 30 and an adjusting gasket 70, and is formed on the second annular end surface 50-12 of the bracket body. An annular groove 50-21 is provided, and at the bottom of the annular groove 50-21, a gas path composed of several small holes 50-22 is communicated with the high-pressure back pressure chamber 5-3. Fig. 3 shows that sealing pad is an annular member, and its cross section is that the П-shaped pad 60 of " П " shape is made of wear-resisting anti-friction material, is accommodated in the annular groove 50 on the second annular end face 50-12 of above-mentioned support body In -21, its first end surface is a plane or similar plane, and an annular groove is formed on the second end surface to form two annular fins 60-1 and 60-2 on the inner and outer edges. After the gas in the chamber enters the bottom of the annular groove 50-21 of the support body through the air path 50-22, the inner and outer edge fins of the П-shaped pad expand to different directions respectively, so that the gas in the sealed annular groove 50-21 will not It leaks along the side wall of the groove, and at the same time, the П-shaped pad can float axially under the action of pressure gas to compensate for the gap and the wear of the П-shaped pad after long-term work. Figures 4 and 5 show that the adjusting sealing gasket 70 has an incomplete circular inner hole 70-1 with a straight edge, which is nested on the outside of the crank throw 40-2 of the main shaft, and is axially installed under the circular slider 30, it There is a gap between the second end surface of the bracket body 50 and the corresponding end surface of the bracket body 50, and only one layer of lubricating oil film is separated between its first end surface and the corresponding end surface of the circular slider 30, and the first end surface of the circular slider 30 is under pressure. It acts directly to provide sealing pressure. When the main shaft rotates, the relative linear movement between the sealing gasket and the slider is adjusted, thereby isolating the gas in the high-pressure back pressure chamber 5-3 and the lubricating oil around the crank throw 40-2. It plays the role of lubricating the surface of relative moving parts.

FIG. 6 illustrates that the back pressure chamber sealing device used in Embodiment 2 of the present invention is a П-shaped pad 60 and a sealing gasket 80 . Figures 7 and 8 illustrate that the sealing gasket 80 has a non-cylindrical outer edge surface 80-1 with a straight edge, which can be nested in the non-circular inner hole 30-1 of the circular slider, and the bolt passes through the central part. The light hole 80-2 is movably pressed on the end face of the crank throw, and the annular step arranged in the axial direction is used for the axial positioning of the sealing gasket on the crank throw, and the sealing pressure acts on the first end face of the sealing gasket The pressure oil provided, the oil hole 80-3 of the gasket 80 communicates with the oil hole (40-3) on the main shaft 40. Both the adjusting gasket 70 and the gasket 80 are made of steel.

In addition to the above, the sealing gasket can also be changed to a rectangular flat gasket in cross section, or use two or more П-shaped pads 60 or flat gaskets at the same time, and the second annular end surface of the bracket body 50 The bottom of the annular groove 50-21 is not provided with a gas passage but replaced by a spring, and the incomplete circular inner hole of the adjustment sealing gasket 70 can be nested with the incomplete cylindrical outer edge surface of the main shaft crank throw 40-2 Various inner holes, changing the non-cylindrical outer edge surface of the sealing gasket 80 into various outer edge cylindrical surfaces that can be nested with the non-circular inner hole of the circular slider 30 are all modifications or deformations of the present invention. Therefore also all belong to the protection scope of the present invention.

Claims (8)

1. the scroll compressor with backpressure cavity sealing device comprises: a non-revolution scroll and a revolution scroll; The interior smooth block of propeller boss that is housed inside above-mentioned revolution scroll; A main shaft that is rotated supporting that combines with above-mentioned smooth block; One except that cooperating the stake body that also has the seal face of two annulars the supporting spindle with the axle journal of above-mentioned main shaft; It is characterized in that: on second annular end face (50-12) of described stake body (50) circular groove (50-21) is set, dress sealing gasket in circular groove (50-21); Between lubricant reservoir (5-4) that smooth block (30) endoporus and end face surround and high pressure back pressure cavity (5-3), adorn Sealing.

2. according to the scroll compressor of the band backpressure cavity sealing device of claim 1, it is characterized in that: the bottom of described circular groove (50-21) is provided with the gas circuit (50-22) that is made of several apertures and is communicated with the high pressure back pressure cavity.

3. according to the scroll compressor of the band backpressure cavity sealing device of claim 1, it is characterized in that: the sealing gasket in the described circular groove (50-21) is that the cross section is the П shape pad (60) of " П " shape.

4. according to the scroll compressor of the band backpressure cavity sealing device of claim 1, it is characterized in that: described Sealing is to establish an adjustment gasket seal (70) that contains the not exclusively round endoporus (70-1) of straight flange; The inner edge surface shape of not exclusively round endoporus (70-1) is that the incomplete columniform outer edge surface shape of same crank throw (40-2) is corresponding; Adjusting gasket seal (70) is the outside that is nested in main shaft crank throw (40-2), and axially be installed in smooth block (30) below.Leave the gap between second end face of adjusting gasket seal (70) and the corresponding end face of stake body (50).Alternating floor lubricant film only between first end face of adjusting gasket seal (70) and the corresponding end face of smooth block (30).

5. according to the scroll compressor of the band backpressure cavity sealing device of claim 1, it is characterized in that: the bottom shock mount of described circular groove (50-21).

6. according to the scroll compressor of the band backpressure cavity sealing device of claim 1, it is characterized in that: the sealing gasket of dress is that the cross section is the flat gasket of rectangle in the described circular groove (50-21).

7. according to the scroll compressor of the band backpressure cavity sealing device of claim 1, it is characterized in that: described Sealing is to establish a gasket seal (80) that contains straight flange non-cylindrical (80-1), and it is corresponding with the inner edge surface shape that one of smooth block (30) contains the non-round endoporus of straight flange (30-1) that one of gasket seal (80) contains the outer edge surface of straight flange non-cylindrical (80-1); Movably press by the unthreaded hole (80-2) in gasket seal (80) center portion and to put on the end face of crank throw (40-2), on gasket seal (80), ring-shaped step is set vertically.

8. according to the scroll compressor of the band backpressure cavity sealing device of claim 4 or 7, it is characterized in that: the sealing that described adjustment gasket seal (70) and gasket seal (80) are located all belongs to the mechanical seal of end face contact-type.

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