Axially flexible seal scroll compressor

Abstract

The application discloses an axial flexible sealing scroll compressor, a driving mechanism is in sealing connection with an upper support, the driving mechanism is connected with a moving scroll, a fixed scroll is in sealing connection with a top end surface of the upper support, a back pressure cavity flexible sealing structure and an anti-rotation mechanism are arranged between the moving scroll and the upper support, the fixed scroll is in sealing connection with an upper shell, a pressure leading channel and a pressure releasing channel are arranged in the fixed scroll, a back pressure valve base and a back pressure valve float are arranged in the fixed scroll, the back pressure valve base is in sealing connection with the fixed scroll, and the back pressure valve float is in axial sliding sealing connection with the fixed scroll. The back pressure valve structure is added in the low-pressure area of the fixed scroll to lead pressure, the temperature change of the working area of the back pressure valve is small, the thermal deformation is small, the leakage probability of the back pressure valve is small, and the back pressure floating effect is good; the back pressure valve is arranged in the fixed scroll, and the machining process is simple; and the axial sealing structure driven by the back pressure valve can greatly improve the operation volume efficiency of the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of scroll compressor, in particular to an axial flexible sealing scroll compressor. BACKGROUND

[0002] Scroll compressor is increasingly widely used in the refrigeration industry, the existing scroll compressor includes a fixed scroll provided with spiral scroll teeth, a movable scroll provided with spiral scroll teeth matched with the fixed scroll, and an anti-rotation mechanism moving between the movable scroll and the upper support, the anti-rotation mechanism limits the movable scroll and the fixed scroll to only move horizontally, the scroll wraps of the movable scroll and the fixed scroll are meshed to form a plurality of pairs of compression chambers, the crankshaft driven by the motor drives the movable scroll to revolve along its orbit, the compression chambers move from outside to inside along the scroll, and the volume gradually decreases, so as to realize the compression of the medium, thereby completing the suction, compression and discharge of the gas. In order to reduce leakage, the top of the scroll teeth of the two scroll parts must be tightly attached to the bottom of the teeth of the other scroll part to reduce the end face leakage between adjacent compression chambers.

[0003] In order to make the top of the scroll teeth of the two scroll parts tightly attached to the bottom of the teeth of the other scroll part to reduce the end face leakage between adjacent compression chambers, in the prior art, the part near the exhaust hole of the movable scroll is provided with a pressure guide hole, through which the high-pressure fluid is guided to the back pressure chamber, and a back pressure hole is provided to ensure pressure balance. The movable scroll can move axially, and when the compressor is working, the pressure of the back pressure chamber and the pressure of the inner compression of the scroll jointly act on the movable scroll to press the movable scroll against the fixed scroll in the axial direction, thereby realizing the axial flexible sealing between the movable scroll and the fixed scroll.

[0004] The deficiencies of the prior art are:

[0005] 1. The pressure guide hole is at the top of the scroll teeth, and the sealing length is relatively small, which causes leakage;

[0006] 2. The pressure guide hole is near the exhaust port, the deformation is large and uncontrollable, and leakage is easy to occur;

[0007] 3. Generally, the surface layer of the movable scroll has a coating, and the process difficulty of machining the hole is relatively high. SUMMARY

[0008] The present application provides an axial flexible sealing scroll compressor to solve the above problems.

[0009] To solve the above technical problems, the technical scheme of the present application is: an axial flexible sealing scroll compressor, comprising an upper shell, a lower shell and a driving mechanism, the upper shell, an upper support and the lower shell are sequentially fixedly connected, the driving mechanism is installed in the lower shell, the upper support is provided with a back pressure mechanism, the driving mechanism is sealingly connected with the upper support, the driving mechanism is connected with a moving scroll, a fixed scroll is sealingly connected with the top end surface of the upper support, a back pressure cavity flexible sealing structure and an anti-rotation mechanism are arranged between the moving scroll and the upper support, the fixed scroll is sealingly connected with the upper shell, the fixed scroll is provided with a pressure introduction channel and a pressure release channel, the fixed scroll is provided with a back pressure valve base and a back pressure valve float, the back pressure valve base is sealingly connected with the fixed scroll, the back pressure valve float is axially slidingly connected with the fixed scroll, and the back pressure valve float is in contact with the back pressure valve base in the normal operation state of the compressor.

[0010] Further, the lower shell comprises a lower end cover and a motor shell which are fixedly connected.

[0011] Further, the driving mechanism comprises a crankshaft, a motor rotor, a motor stator and a movable balance block, the motor stator is fixedly arranged in the lower shell, the motor rotor is sleeved on the lower part of the crankshaft, the upper part of the crankshaft is sleeved with the movable balance block, and the movable balance block is connected with the moving scroll.

[0012] Further, the pressure introduction channel is connected with a high-pressure cavity formed between the upper shell and the fixed scroll.

[0013] Further, the pressure release channel is connected with a back pressure cavity formed between the moving scroll, the back pressure cavity flexible sealing structure and the upper support.

[0014] Further, the back pressure valve base is connected with the pressure introduction channel and the pressure release channel.

[0015] The present application introduces pressure by adding a back pressure valve structure in the low-pressure area of the fixed scroll, the working area of the back pressure valve has less temperature change, small thermal deformation, small leakage probability and good back pressure floating effect; the problems of easy leakage, large part processing difficulty and unreliable sealing property of the prior art are solved; the back pressure valve is arranged in the fixed scroll, and the processing technology is simple; the axial sealing structure driven by the back pressure valve can greatly improve the operation volumetric efficiency of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a structural schematic diagram of the present application;

[0017] Fig. 2 is a partial structural schematic diagram of the present application.

[0018] Wherein: 1 - the upper shell, 2 - the fixed scroll, 3 - the moving scroll, 4 - the back pressure cavity flexible sealing structure, 5 - the upper support, 6 - the crankshaft, 7 - the motor rotor, 8 - the motor stator, 9 - the lower end cover, 10 - the pressure channel, 11 - the pressure release channel, 12 - the back pressure valve base, 13 - the back pressure valve float, 14 - the movable balance block, 15 - the back pressure mechanism, 16 - the anti-rotation mechanism, 17 - the motor shell. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application are further described below with reference to the accompanying drawings. Figs. 1-2 The specific embodiments of the present application are further described below with reference to the accompanying drawings.

[0020] An axial flexible sealing scroll compressor, comprising an upper shell 1, a lower shell and a driving mechanism, the upper shell 1, the upper support 5 and the lower shell are sequentially fixedly connected, the driving mechanism is installed in the lower shell, the back pressure mechanism 15 is arranged in the upper support 5, the driving mechanism is sealingly connected with the upper support 5, the driving mechanism is connected with the moving scroll 3, the fixed scroll 2 is sealingly connected with the top end surface of the upper support 5, the back pressure cavity flexible sealing structure 4 and the anti-rotation mechanism 16 are arranged between the moving scroll 3 and the upper support 5, the fixed scroll 2 is sealingly connected with the upper shell 1, the pressure channel 10 and the pressure release channel 11 are arranged in the fixed scroll 2, the back pressure valve base 12 and the back pressure valve float 13 are arranged in the fixed scroll 2, the back pressure valve base 12 is sealingly connected with the fixed scroll 2, the back pressure valve float 13 is axially slidingly connected with the fixed scroll 2, and the back pressure valve float 13 is in contact sealing with the back pressure valve base 12 in the normal operation state of the compressor; the pressure channel 10 is connected with the high pressure cavity formed between the upper shell 1 and the fixed scroll 2, the pressure release channel 11 is connected with the back pressure cavity formed between the moving scroll 3, the back pressure cavity flexible sealing structure 4 and the upper support 5, and the back pressure valve base 12 is connected with the pressure channel 10 and the pressure release channel 11. The lower shell comprises a lower end cover 9 and a motor shell 17 which are fixedly connected. The driving mechanism comprises a crankshaft 6, a motor rotor 7, a motor stator 8 and a movable balance block 14, the motor stator 8 is fixed in the lower shell, the motor rotor 7 is sleeved on the lower part of the crankshaft 6, the movable balance block 14 is sleeved on the upper part of the crankshaft 6, and the movable balance block 14 is connected with the moving scroll 3.

[0021] The motor stator 8 forms a rotating magnetic field after being electrified to drive the motor rotor 7 and the crankshaft 6 to rotate. The movable balance block 14 is matched on the eccentric part of the crankshaft 6, the moving scroll 3 is driven by the movable balance block 14 and the crankshaft 6 to perform orbital plane motion along the central axis of the crankshaft 6, and the anti-rotation mechanism 16 is installed between the moving scroll 3 and the upper support 5 to ensure that the moving scroll 3 can only move horizontally and cannot rotate. The moving scroll 3 and the fixed scroll 2 cooperate with each other to form a plurality of compression cavities to complete the processes of suction, compression and exhaust of the compressed working medium.

[0022] The movable scroll 3 and the movable balance block 14 can move within a certain range along the eccentric part of the crankshaft 6, the movable scroll 3 and the upper support 5 form a back pressure cavity through the back pressure cavity flexible sealing structure 4, the back pressure provided by the back pressure cavity can push the movable scroll 3 and the fixed scroll 2 to be closely engaged, but if the back pressure is too high, it will cause excessive friction loss, increase the power consumption of the compressor, wear the scroll, and reduce the energy efficiency; when the back pressure is insufficient, the movable scroll will overturn or separate, causing the scroll compression cavity to leak, reducing the energy efficiency of the compressor.

[0023] The back pressure valve structure is composed of a back pressure valve base 12 and a back pressure valve float 13, the back pressure valve base 12 is connected with the pressure introduction channel 10, and high-pressure gas (exhaust side pressure gas) is introduced into the back pressure valve base 12. The back pressure valve float 13 is connected with the pressure release channel 11 and is in contact with the back pressure valve base 12 for sealing. During the operation of the movable scroll 3 and the fixed scroll 2, high-pressure gas is generated by the exhaust, which is introduced into the back pressure cavity structure at the bottom of the movable scroll 3 through the pressure introduction channel 10, the back pressure valve base 12, the back pressure valve float 13, and the pressure release channel 11, and the back pressure generated by the back pressure cavity pushes the scroll 3 and the fixed scroll 2 to be axially flexible sealed.

[0024] The movement state of the back pressure valve float 13 is related to the state of the movable scroll 3; the high-pressure gas provided by the back pressure valve base 12 pushes the upper end surface of the back pressure valve float 13 to move downward; the movable scroll 3 and the back pressure valve float 13 move upward; when the back pressure valve float 13 moves upward and contacts the back pressure valve base 12, the pressure introduction channel 10 and the pressure release channel 11 are closed. When the movable scroll is in an overturned state or separated, the back pressure valve float 13 moves downward and the lower surface contacts the movable scroll 3. At this time, the back pressure valve float 13 is not in contact with the back pressure valve base 12, so that the pressure introduction channel 10 and the pressure release channel 11 are connected.

[0025] The engagement and disengagement of the movable scroll 3 causes the back pressure valve float 13 to move up and down, thereby controlling the connection and closing of the pressure introduction channel 10 and the pressure release channel 11. When the pressure introduction channel 10 and the pressure release channel 11 are connected, the high-pressure gas is connected with the back pressure cavity, the back pressure rises, and the back pressure can push the movable scroll 3 and the fixed scroll 2 to be axially sealed; when the pressure introduction channel 10 and the pressure release channel 11 are closed, at the same time, the back pressure cavity will be slowly reduced due to the back pressure mechanism 15, and within a period of time, the sealing of the movable scroll 3 and the fixed scroll 2 will be broken, and the movable scroll 3 will be overturned or separated.

[0026] The back pressure cavity is provided with a back pressure mechanism 15 connected with the back pressure cavity and a low-pressure cavity. The back pressure mechanism 15 ensures the dynamic balance of the pressure of the back pressure cavity. It should be noted that the flow rate of the back pressure mechanism 15 is smaller than the flow rate of the pressure introduction channel 10 and the pressure release channel 11.

[0027] The working principle of this invention is as follows: When the compressor starts, as the moving scroll 3 rotates, the pressure in the compression chamber formed by the moving scroll 3 and the stationary scroll 2 increases. This pushes the moving scroll 3 and the stationary scroll 2 apart by a certain distance. At this time, the back pressure valve float 13 opens, connecting the pressure-inducing channel 10 and the pressure-releasing channel 11. A portion of the pressure in the compression chamber can enter the back pressure chamber of the moving scroll 3 through the pressure-inducing channel 10 and the pressure-releasing channel 11. Simultaneously, as the pressure in the back pressure chamber increases, the moving scroll 3 can move axially along the stationary scroll 2, pressing it against the stationary scroll 2. At this time, the back pressure valve float 13 closes, and the pressure-inducing channel 10 and the pressure-releasing channel 11 close. The pressure in the back pressure chamber no longer increases. Because of the back pressure mechanism 15, the pressure in the back pressure chamber is gradually released. When the pressure in the back pressure chamber is insufficient to push the moving vortex 3 and the fixed vortex 2 into a tight fit, the moving vortex 3 will overturn or detach. At this time, the back pressure valve float 13 opens again, introducing high-pressure fluid into the back pressure chamber from the pressure-inducing channel 10 and the pressure-releasing channel 11, and the moving vortex 3 and the fixed vortex 2 are once again tightly fitted. This cycle repeats, ensuring that the moving vortex 3 and the fixed vortex 2 are always tightly fitted, achieving axial flexible sealing.

[0028] The pressure channel 10 can draw pressure from the exhaust port or the high-pressure chamber, which can efficiently introduce high-pressure airflow into the back pressure valve base 12.

[0029] The back pressure valve float 13 and the back pressure valve base 12 are sealed using end face sealing or conical sealing to ensure that when the back pressure valve float 13 is closed, the pressure inlet channel 10 and the pressure outlet channel 11 are closed.

[0030] The backplate of the dynamic vortex 3 is equipped with a flexible compensation sealing mechanism to ensure that the back pressure chamber does not leak during the axial movement of the dynamic vortex 3.

[0031] A back pressure structure 15 is set on the upper support 5 or the moving vortex 3 to ensure that the back pressure can change with the movement state of the moving vortex 3.

[0032] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An axially flexible sealed scroll compressor, characterized in that, The system includes an upper shell (1), a lower shell, and a drive mechanism. The upper shell (1), upper support (5), and lower shell are fixedly connected in sequence. The drive mechanism is installed inside the lower shell. The upper support (5) is equipped with a back pressure mechanism (15). The drive mechanism is sealed to the upper support (5) and connected to the moving vortex (3). The fixed vortex (2) is sealed to the top end face of the upper support (5). The flexible sealing structure (4) of the back pressure chamber and the anti-rotation mechanism (16) are set between the moving vortex (3) and the upper support (5). The fixed vortex (2) is sealed to the upper shell (1). The fixed vortex (2) is provided with a pressure channel (10) and a pressure release channel (11). The fixed vortex (2) is equipped with a back pressure valve base (12) and a back pressure valve float (13). The pressure valve base (12) is sealed to the fixed vortex (2), and the back pressure valve float (13) is axially sliding sealed to the fixed vortex (2). Under normal operating conditions of the compressor, the back pressure valve float (13) is in contact with the back pressure valve base (12) and sealed. The back pressure valve base (12) is connected to the pressure channel (10) to introduce high pressure gas into the back pressure valve base (12). The back pressure valve float (13) is connected to the pressure relief channel (11) and is in contact with the back pressure valve base (12) and sealed. The pressure channel (10) is connected to the high pressure chamber formed between the upper shell (1) and the fixed vortex (2). The pressure relief channel (11) is connected to the back pressure chamber formed between the moving vortex (3), the flexible sealing structure of the back pressure chamber (4), and the upper support (5).

2. The axially flexible sealed scroll compressor according to claim 1, characterized in that, The lower housing includes a lower end cover (9) and a motor housing (17) that are fixedly connected.

3. The axially flexible sealed scroll compressor according to claim 1, characterized in that, The drive mechanism includes a crankshaft (6), a motor rotor (7), a motor stator (8), and a movable balance block (14). The motor stator (8) is fixed inside the lower housing, the motor rotor (7) is fitted on the lower part of the crankshaft (6), and the movable balance block (14) is fitted on the upper part of the crankshaft (6). The movable balance block (14) is connected to the moving vortex (3).

4. The axially flexible sealed scroll compressor according to claim 1, characterized in that, The pressure channel (10) is connected to the high-pressure cavity formed between the upper shell (1) and the fixed vortex (2).

5. The axially flexible sealed scroll compressor according to claim 1, characterized in that, The pressure relief channel (11) is connected to the back pressure cavity formed between the dynamic vortex (3), the flexible sealing structure of the back pressure cavity (4), and the upper support (5).

6. The axially flexible sealed scroll compressor according to claim 1, characterized in that, The back pressure valve base (12) is connected to the pressure channel (10) and the pressure release channel (11).

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