Compressor bearing cooling assembly, scroll compressor and air conditioning system

Abstract

The application provides a compressor bearing cooling assembly, scroll compressor and air conditioning system. The compressor bearing cooling assembly comprises a sealed chamber and a bearing arranged in the sealed chamber; a refrigerant circulation loop in which the sealed chamber is arranged, and a fluid in the refrigerant circulation loop cools the bearing. The application utilizes the refrigerant flow in the refrigerant circulation loop to effectively cool the bearing in the scroll compressor, forms pressure in the chamber, reduces the possibility of the orbiting scroll disc overturning, and improves the operation life of the bearing and the reliability of the whole machine.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air conditioning systems, and particularly relates to a compressor bearing cooling assembly, scroll compressor and air conditioning system. BACKGROUND

[0002] Energy and environmental pollution are one of the major problems faced by the world today. Energy is the material basis of modern society and life. With the rapid increase of the world population and economy, the consumption of energy has increased dramatically, leading to the intensification of environmental pollution. Scroll compressors have the characteristics of high efficiency, low vibration, compact structure and light weight, and air conditioning systems are increasingly choosing scroll compressors as their core power components. Scroll compressors compress the low-temperature and low-pressure refrigerant gas sucked from the evaporator into high-temperature and high-pressure gas through high-speed rotation, and then discharge it to the condenser to realize the refrigeration cycle.

[0003] As a bearing for supporting and transmitting the high-speed rotation inside the scroll compressor, the bearing bears a very large load. The temperature rise of the bearing caused by its working environment and heat generation will greatly test the reliability and operating life of the bearing. Therefore, how to use technical means to effectively cool and cool the bearing has become a major problem in the industry.

[0004] The prior art discloses a structure in which a fan blade is installed in a bearing seat, but the bearing is still in a relatively open environment. The fan blade rotates and the pressure difference causes the refrigerant flowing through the motor to cool the bearing. The refrigerant flowing through the motor has a certain temperature rise due to the large heat generation of the motor. If the compressor is in a low-flow limit condition, the bearing temperature cannot be reduced, and the reliable operation of the compressor cannot be guaranteed. SUMMARY

[0005] Therefore, the application provides a compressor bearing cooling assembly, scroll compressor and air conditioning system, which can solve the problem that the bearing temperature cannot be reduced and the reliable operation of the compressor cannot be guaranteed in the prior art.

[0006] To solve the above problems, the application provides a compressor bearing cooling assembly, comprising:

[0007] a sealing chamber and a bearing, the bearing being arranged in the sealing chamber;

[0008] a refrigerant circulation loop, the sealing chamber being arranged in the refrigerant circulation loop, and the fluid in the refrigerant circulation loop cooling the bearing.

[0009] Optionally, the bearing comprises a main bearing and a sub bearing supported at both ends of the crankshaft, and the sealing cavity is provided with two chambers, i.e. a first chamber and a second chamber; the main bearing is arranged in the first chamber, and the sub bearing is arranged in the second chamber.

[0010] Optionally, the crankshaft comprises an eccentric shaft, and the bearing further comprises an eccentric bearing sleeved on the eccentric shaft, and the eccentric bearing is arranged in the first chamber.

[0011] According to another aspect of the present application, a scroll compressor is provided, which comprises the compressor bearing cooling assembly as described above.

[0012] Optionally, the scroll compressor further comprises a support for supporting the bearing, and the support is provided with a through hole, and the sealing cavity is communicated with the refrigerant circulation loop through the through hole.

[0013] Optionally, when the bearing comprises a main bearing and a sub bearing supported at both ends of the crankshaft, the scroll compressor further comprises a support seat, a moving scroll, a mounting seat and a sealing cover, the support seat supports the main bearing and is sealingly matched with the moving scroll; the first chamber is surrounded by the support seat, the moving scroll and the crankshaft; the mounting seat supports the sub bearing, and the second chamber is surrounded by the mounting seat, the sealing cover and the crankshaft.

[0014] According to still another aspect of the present application, an air conditioning system is provided, which comprises the compressor bearing cooling assembly as described above or the scroll compressor as described above.

[0015] Optionally, the air conditioning system comprises a scroll compressor, a condenser, a throttling device and an evaporator connected in circulation; and further comprises a refrigerant circulation loop, which comprises the sealing cavity, a circulation pump and the evaporator connected in circulation.

[0016] Optionally, the air conditioning system further comprises a loop, one end of which is connected between the throttling device and the evaporator, and the other end of which is connected between the circulation pump in the refrigerant circulation loop and the evaporator.

[0017] Optionally, the throttling device comprises a first throttling valve and a second throttling valve arranged in series, and the loop is connected at one end between the first throttling valve and the second throttling valve.

[0018] The compressor bearing cooling assembly provided by the present application comprises a sealing cavity and a bearing arranged in the sealing cavity; a refrigerant circulation loop, the sealing cavity is arranged in the refrigerant circulation loop, and a fluid in the refrigerant circulation loop cools the bearing.

[0019] The application utilizes the refrigerant circulation loop to effectively cool the bearing inside the scroll compressor, and forms pressure inside the cavity to reduce the possibility of the dynamic scroll plate overturning, and improve the operation life of the bearing and the reliability of the whole machine. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The figure is a structural schematic diagram of the scroll compressor of the embodiment of the application.

[0021] Figure 2 The figure is a structural schematic diagram of the air conditioning system of the embodiment of the application.

[0022] Figure 3 The figure is a structural schematic diagram of the sealing cover ring of the embodiment of the application.

[0023] Figure 4 The figure is a schematic diagram of the sealing gasket of the embodiment of the application.

[0024] Figure 5 The figure is a sectional view of the inlet pipe or outlet pipe of the embodiment of the application.

[0025] Figure 6 The figure is a sectional view of the main bearing of the embodiment of the application.

[0026] The figure is a structural schematic diagram of the air conditioning system of the embodiment of the application.

[0027] 1, evaporator; 2, scroll compressor; 21, sub-bearing mounting seat; 3, condenser; 4, first throttle valve; 5, second throttle valve; 6, electric switch; 7, circulating pump; 8, outlet one-way valve; 201, suction port; 202, motor assembly; 203, main bearing; 204, support seat; 205, dynamic scroll bearing; 206, crankshaft; 207, sub-bearing; 208, main shaft sealing ring; 209, dynamic scroll plate; 210, support seat wear-resistant sheet; 211, sub-bearing seat sealing cover; 212, sub-shaft sealing ring; 213, bolt; 2141, main cooling inlet pipe; 2142, main cooling outlet pipe; 2151, sub-cooling inlet pipe; 2152, sub-cooling outlet pipe; 2111, metal body; 2112, sealing rubber; 2113, sealing ring mounting seat; 2114, through hole; 2041, support seat inlet; 2042, support seat outlet. DETAILED DESCRIPTION

[0028] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0029] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0030] Reference should be made to Figures 1 to 6 As shown, according to the embodiments of the present application, a compressor bearing cooling assembly comprises:

[0031] a sealed chamber and a bearing arranged in the sealed chamber;

[0032] a refrigerant circulation loop, the sealed chamber is arranged in the refrigerant circulation loop, and a fluid in the refrigerant circulation loop cools the bearing.

[0033] The present application takes full advantage of the flow of refrigerant in the refrigerant circulation loop to effectively cool the bearings inside the scroll compressor 2, while forming pressure inside the cavity to reduce the possibility of the orbiting scroll plate 209 overturning, and improve the operating life of the bearings and the reliability of the whole machine.

[0034] In some embodiments, the bearing comprises a main bearing 203 and a secondary bearing 207 supported at both ends of the crankshaft 206, and the sealed chamber comprises two chambers: a first chamber and a second chamber; the main bearing 203 is arranged in the first chamber, and the secondary bearing 207 is arranged in the second chamber.

[0035] For the structure that bearings are arranged at both ends of the crankshaft 206, the sealed chambers need to be arranged at the corresponding positions of both ends respectively, and similarly, for the shaft structure with more bearings arranged, more sealed chambers can be arranged to cool the bearings in each sealed chamber by the refrigerant circulation mode.

[0036] In some embodiments, the crankshaft 206 comprises an eccentric shaft, and the bearing further comprises an eccentric bearing sleeved on the eccentric shaft, and the eccentric bearing is arranged in the first chamber.

[0037] For the crankshaft 206 structure with the eccentric shaft at the end, the eccentric shaft sleeved with the dynamic scroll bearing 205 can be arranged in the first chamber together with the main bearing 203, and the dynamic scroll bearing 205 and the main bearing 203 are cooled by the refrigerant.

[0038] According to another aspect of the present application, a scroll compressor 2 is provided, comprising the compressor bearing cooling assembly as described above.

[0039] In some embodiments, the scroll compressor 2 further comprises a support for supporting the bearing, and the support is provided with a through hole 2114, and the sealing chamber is communicated with the refrigerant circulation loop through the through hole 2114.

[0040] The sealing chamber is communicated with the outside of the compressor, and the through hole 2114 can be arranged on the support for supporting the bearing, and the support can be a bracket or an end cover, and the through hole is directly arranged on the original structure without the need of additional components.

[0041] In some embodiments, when the bearing comprises the main bearing 203 and the auxiliary bearing 207 supported at both ends of the crankshaft 206, the scroll compressor 2 further comprises a support seat 204, a dynamic scroll, a mounting seat and a sealing cover, the support seat 204 supports the main bearing 203 and is sealingly connected with the dynamic scroll, the first chamber is formed by the support seat 204, the dynamic scroll and the crankshaft 206, the mounting seat supports the auxiliary bearing 207, and the second chamber is formed by the mounting seat, the sealing cover and the crankshaft 206.

[0042] For the scroll compressor, the main shaft segment sealing ring 208 is arranged on the support seat 204, the first chamber is formed between the support seat 204, the support seat wear-resistant sheet 210, the dynamic scroll 209 and the crankshaft 206, and the dynamic scroll bearing 205 and the main bearing 203 rotate at high speed in the first chamber. The second chamber is formed between the auxiliary bearing mounting seat 21, the auxiliary bearing seat sealing cover 211 and the auxiliary shaft segment sealing ring 212 of the scroll compressor, and the auxiliary bearing 207 works in the chamber.

[0043] According to still another aspect of the present application, an air conditioning system is provided, comprising the compressor bearing cooling assembly as described above or the scroll compressor 2 as described above.

[0044] In some embodiments, the air-conditioning system includes a scroll compressor 2, a condenser 3, a throttling device and an evaporator 1 that are cyclically connected; and also includes a refrigerant circulation loop, which includes the sealed chamber, the circulation pump 7 and the evaporator 1 that are cyclically connected.

[0045] The scroll compressor 2, condenser 3, throttling device and evaporator 1 are connected in a circular manner; it also includes a refrigerant circulation loop, which completes the refrigeration cycle of the air-conditioning system. The heat absorption effect of the evaporator 1 is used to cool the refrigerant in the refrigerant circulation loop, thereby cooling the sealed chamber and the bearings inside it.

[0046] In some embodiments, the air conditioning system further includes a loop, one end of which is connected between the throttling device and the evaporator 1 , and the other end of which is connected between the circulation pump 7 in the refrigerant circulation loop and the evaporator 1 .

[0047] By setting up a loop between the refrigeration cycle and the refrigerant circulation circuit, the two cycles are connected and the refrigerant is in a conductive state, ensuring the stability of the entire system.

[0048] In some embodiments, the throttling device includes a first throttle valve 4 and a second throttle valve 5 arranged in series, and one end of the loop is connected between the first throttle valve 4 and the second throttle valve 5.

[0049] like Figure 2 The principle diagram of the air-conditioning system shown in the figure can realize the combination of bearing cooling and refrigeration cycle. The refrigeration cycle is that the refrigerant fluid absorbs heat and flashes through the evaporator 1, enters the scroll compressor 2, is compressed by the scroll compressor 2, is discharged to the condenser 3, passes through the first throttle valve 4 and the second throttle valve 5, and then returns to the evaporator 1 to form a cycle. The other circuit is a refrigerant circulation circuit, used to cool the bearings. The fluid in the refrigeration circuit, compressed by the scroll compressor 2 and discharged to the condenser 3, then passes through the first throttle valve 4. A portion of it flows through a bypass to the refrigerant circulation circuit. Since it has only undergone one throttling, the temperature of the refrigerant circulation circuit fluid is higher than that of the refrigeration circuit fluid. Therefore, the refrigerant circulation circuit fluid releases its temperature after entering the evaporator, causing the refrigeration circulation circuit fluid to flash into a gaseous state. The low-temperature refrigerant circulation circuit fluid then passes through the main cooling inlet pipe 2141 and the auxiliary cooling inlet pipe 2151 to cool the main support bearing 203, the orbiting scroll bearing 205, and the auxiliary support bearing 207 inside the scroll compressor 2. The auxiliary circuit fluid, having completed the cooling task, passes through the main cooling outlet pipe 2142 and the auxiliary cooling outlet pipe 2152, leaving the scroll compressor 2. After being combined, it passes through the circulating pump 7 and the one-way valve 8 to reunite with the circuit fluid and re-enter the evaporator 1, thus completing the bearing cooling cycle. An electric switch 6 can be provided on the bypass circuit, which can be selectively turned on or off to control the flow of refrigerant in the two circuits.

[0050] The support seat 204 in the scroll compressor is machined with through holes, which are a support seat air inlet 2041 and a support seat air outlet 2042, respectively, and are in interference fit with a main cooling air inlet pipe 2141 and a main cooling air outlet pipe 2142, respectively. The auxiliary bearing seat sealing cover 211 is mainly composed of a metal body 2111, which is combined into an integral body with a sealing rubber 2112 through a vulcanization sintering process. The auxiliary bearing seat sealing cover 211 also has a sealing ring mounting seat 2113 and a through hole 2114. The sealing ring mounting seat 2113 of the present scheme is internally mounted with an auxiliary shaft section shaft sealing ring 212. The auxiliary bearing seat sealing cover 211 is sealed by locking between the auxiliary bearing seat sealing cover 211 and the auxiliary bearing mounting seat 21 through a bolt 213.

[0051] The material of the sealing rubber 2112 can be nitrile rubber NBR or hydrogenated nitrile HNBR. The material of the main shaft section shaft sealing ring 208 and the auxiliary shaft section shaft sealing ring 212 is preferably polytetrafluoroethylene PTFE material, or a metal material. The auxiliary shaft section shaft sealing ring 212 is in interference fit with the sealing ring mounting seat 2113 of the auxiliary bearing seat sealing cover 211.

[0052] It is easy for those skilled in the art to understand that the above-mentioned various embodiments can be freely combined and superimposed without conflict.

[0053] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application and should be noted that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should be considered as the protection scope of the present application.

Claims

1. An air conditioning system, characterized by, The compressor bearing cooling assembly comprises: a sealed chamber and a bearing arranged in the sealed chamber; a refrigerant circulation loop, the sealed chamber is arranged in the refrigerant circulation loop, and fluid in the refrigerant circulation loop cools the bearing; The air conditioning system comprises a scroll compressor (2), a condenser (3), a throttling device and an evaporator (1) connected in a circulation; the refrigerant circulation loop comprises the sealed chamber, a circulation pump (7) and the evaporator (1) connected in a circulation; the air conditioning system further comprises a loop connected at one end between the throttling device and the evaporator (1) and at the other end between the circulation pump (7) and the evaporator (1) in the refrigerant circulation loop.

2. The air conditioning system of claim 1, wherein, The bearing comprises a main bearing (203) and a secondary bearing (207) supported at both ends of a crankshaft (206), and the sealed chamber comprises a first chamber and a second chamber; the main bearing (203) is arranged in the first chamber, and the secondary bearing (207) is arranged in the second chamber.

3. The air conditioning system of claim 2, wherein, The crankshaft (206) comprises an eccentric shaft, and the bearing further comprises an eccentric bearing sleeved on the eccentric shaft, and the eccentric bearing is arranged in the first chamber.

4. The air conditioning system of any one of claims 1-3, wherein, The scroll compressor further comprises a support for supporting the bearing, and the support is provided with a through hole (2114), and the sealed chamber communicates with the refrigerant circulation loop through the through hole (2114).

5. The air conditioning system of claim 4, wherein, When the bearing comprises a main bearing (203) and a secondary bearing (207) supported at both ends of a crankshaft (206), and the sealed chamber comprises a first chamber and a second chamber; and the main bearing (203) is arranged in the first chamber, and the secondary bearing (207) is arranged in the second chamber, the scroll compressor further comprises a support seat (204), a moving scroll, a mounting seat and a sealing cover, the support seat (204) supports the main bearing (203) and is in sealed cooperation with the moving scroll; the first chamber is surrounded by the support seat (204), the moving scroll and the crankshaft (206); the mounting seat supports the secondary bearing (207), and the second chamber is surrounded by the mounting seat, the sealing cover and the crankshaft (206).

6. The air conditioning system of any one of claims 1-3, wherein, The throttling device comprises a first throttling valve (4) and a second throttling valve (5) arranged in series, and the loop is connected at one end between the first throttling valve (4) and the second throttling valve (5).

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