Exhaust end bearing housing and screw compressor and air conditioning system having the same

Abstract

The application discloses an exhaust end bearing seat, a screw compressor with the bearing seat and an air conditioning system. The exhaust end bearing seat comprises a flange face, a male rotor bearing cavity and a female rotor bearing cavity arranged on one side of the flange face, and an exhaust orifice arranged on the flange face. The exhaust end bearing seat is arranged in a high-pressure stage body and connected with an exhaust end of a low-pressure stage body, and meanwhile, an exhaust end face of the low-pressure stage body is directly connected with an intake end face of the high-pressure stage body, so that the size of the compressor is reduced; a precise positioning installation surface is reduced, the cumulative positioning deviation is reduced, and the operation performance of the compressor is improved. The exhaust end bearing seat is arranged internally and does not serve as an external sealing unit, one connected sealing end face is reduced, the leakage risk is reduced, and the reliability of the operation of the compressor is improved. In addition, the structure of the exhaust end bearing seat is simplified, a long exhaust cavity flow channel behind the exhaust orifice is omitted, a completely open layout is adopted, the exhaust is more smooth, and the energy efficiency of the compressor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a fluid conveying device, in particular to a bearing seat for a discharge end of a screw compressor, a screw compressor with the bearing seat, and an air conditioning system with the screw compressor. BACKGROUND

[0002] The discharge end bearing seat is an essential core component in a screw compressor, and is usually used for installing and positioning a bearing at a discharge end of a rotor of the screw compressor, setting a servo drive oil cylinder, a discharge port of the compressor, and fixing an oil separation filter screen. Figure 1 As shown in FIG. 1, the existing discharge end bearing seat usually includes a flange surface 01, a female rotor bearing cavity 02, a male rotor bearing cavity 03, a slide valve oil cavity 04, a discharge cavity 05, and an oil return path and an oil supply path, etc. disposed on one side of the flange surface. The existing discharge end bearing seat has two core functions of installing and positioning a bearing and setting an axial orifice, and also has other additional functions. Therefore, the size of the discharge end bearing seat is large, and the structure is complex, thereby affecting the smoothness of a discharge channel of the compressor. For example, in a single machine double-stage compressor model, since there are two pairs of rotors of high and low pressure stages, the radial and axial sizes of the compressor are larger than those of a general single machine model, and in particular, the axial size is larger than that of the general single machine model. Therefore, when the existing discharge end bearing seat is used in an ultra-high efficiency single machine double-stage compressor model, the compressor is inconvenient to install, and the performance is relatively poor.

[0003] Please refer to Figure 2 FIG. 2 is a schematic view of a connection structure of a single machine double-stage screw compressor. Usually, the axial connection mode is: a low pressure stage machine body (with a low pressure stage rotor) 06 - a low pressure stage discharge end bearing seat 07 - a high pressure stage machine body (with a high pressure stage rotor) 08 - a high pressure stage discharge end bearing seat 09. The refrigerant enters from the suction port of the low pressure stage machine body 06 on the right side, and is discharged from the discharge port of the high pressure stage discharge end bearing seat 09 on the left side. Due to the errors caused by machining precision, assembly precision, and thermal expansion, the rotor and the end surface of the discharge end bearing seat may be rubbed, which may cause a fault. During installation, a positioning pin needs to be arranged between the end surface of the machine body and the end surface of the discharge end bearing seat for precise positioning connection. The axial direction of the double-stage screw compressor needs to be connected by multiple stages, and the errors at each position are added, which finally causes a large cumulative error of the coaxiality. When the cumulative error is too large, the bearings at both ends of the rotor cannot meet the requirement of the coaxiality, which may affect the rotation of the rotor, the meshing, the smooth transmission of the torque of the coupling, and the smooth output of the torque of the motor. At the same time, noise, vibration, rotor wear, and other problems may be caused, and in severe cases, the female and male rotors may be locked, so that the compressor cannot operate normally. In addition, the end surfaces of each part connected in the axial direction need to be sealed, and therefore, too many connected end surfaces may increase the possibility of gas leakage, thereby reducing the reliability of the compressor.

[0004] Therefore, how to overcome the defects of the existing double-stage screw compressor, such as complex structure, low installation precision, and influence on the operation performance of the compressor, is an urgent problem to be solved in the industry. SUMMARY

[0005] The present application provides a simple structure, high installation precision exhaust end bearing seat and a screw compressor with the exhaust end bearing seat and an air conditioning system with the screw compressor.

[0006] The present application provides an exhaust end bearing seat, which comprises a flange surface, a male rotor bearing cavity and a female rotor bearing cavity arranged on one side of the flange surface, and an exhaust orifice arranged on the flange surface.

[0007] Preferably, the exhaust orifice is an open exhaust orifice corresponding to the exhaust end of a pair of rotors of the screw compressor.

[0008] Preferably, the open exhaust orifice is a structure formed by missing from the edge of the flange surface to the middle part of the flange surface.

[0009] Preferably, the opposite sides of the missing structure are provided with a male side axial exhaust port stop edge on one side and a female side axial exhaust port stop edge on the other side.

[0010] Preferably, the middle part of the missing structure is provided with a rotor high-pressure meshing area stop edge.

[0011] Preferably, the flange surface is provided with a positioning and installation structure.

[0012] The present application also provides a screw compressor, which comprises a low-pressure stage body, a high-pressure stage body, and an exhaust end bearing seat provided by the present application, the exhaust end bearing seat is arranged inside the high-pressure stage body shell, and the flange surface of the exhaust end bearing seat is connected with the exhaust end surface of the low-pressure stage body.

[0013] Preferably, the exhaust end surface of the low-pressure stage body is directly connected with the intake end surface of the high-pressure stage body.

[0014] The present application provides an air conditioning system with the screw compressor of the present application.

[0015] The radial size of the exhaust end bearing seat is reduced and arranged in the high-pressure stage cylinder block, so that the exhaust end face of the low-pressure stage cylinder block can be directly connected with the intake end face of the high-pressure stage cylinder block, the axial space of the exhaust end bearing seat is reduced, the radial and axial sizes of the compressor are greatly reduced, the number of parts is reduced, and the production cost of the compressor is reduced. Since the exhaust end bearing seat is assembled in the high-pressure stage cylinder block, the exhaust end face of the exhaust end bearing seat is only connected and installed with the exhaust end face of the low-pressure stage shell, is only associated with the exhaust end positioning of the rotor shaft system, and is not associated with other units. In this way, one accurate positioning and installation surface is reduced, the number of cumulative positioning times is reduced, the accumulation of positioning deviation is effectively overcome, the assembly precision is improved, and the operation performance of the compressor is improved. Since the exhaust end bearing seat is arranged in the high-pressure stage shell in a pressure-bearing and sealed manner, the exhaust end bearing seat is not used as an external sealing unit, one connected sealing end face is reduced, the risk of leakage is reduced, and the reliability of the operation of the compressor is improved. In addition, the structure of the exhaust end bearing seat is simplified, the long exhaust cavity flow channel behind the exhaust port is omitted, the layout is completely open, the exhaust is more smooth, and the energy efficiency of the compressor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a three-dimensional structural schematic diagram of an existing exhaust end bearing seat;

[0017] Figure 2 FIG. 4 is a schematic diagram of an axial connection structure of an existing single-machine double-stage screw compressor;

[0018] Figure 3 FIG. 6 is a three-dimensional structural schematic diagram of an exhaust end bearing seat embodiment of the present application;

[0019] Figure 4 FIG. 8 is a schematic diagram of an axial connection structure of a single-machine double-stage screw compressor embodiment of the present application. DETAILED DESCRIPTION

[0020] The present application will be further described below in combination with the drawings and embodiments.

[0021] As Figure 3 , 4As shown, the embodiment of the low-pressure stage exhaust end bearing seat of the single-machine two-stage screw compressor provided by the application. The low-pressure stage exhaust end bearing seat 10 includes a flange surface 1, a male rotor bearing cavity 2 and a female rotor bearing cavity 3 arranged on one side (the right side) of the flange surface 1. The female rotor bearing cavity 3 and the male rotor bearing cavity 2 are in the form of a cylinder, and one or more bearings for supporting the exhaust end shaft of the low-pressure stage rotor 9 can be arranged in the inner cavity of the cylinder according to requirements. In addition, bearings are arranged for supporting the intake end shaft of the low-pressure stage rotor 9, which is not shown in the figure. The flange surface 1 of the application is provided with an exhaust orifice 4, and no pipeline-shaped exhaust cavity flow channel is arranged behind the exhaust orifice 4. In this embodiment, the exhaust orifice 4 is an open exhaust orifice corresponding to the exhaust end of the low-pressure stage rotor 9 of the screw compressor. The open exhaust orifice is formed by missing the edge of the flange surface 1 to the middle part of the flange surface 1.

[0022] The opposite sides of the missing structure are provided with the butterfly port as described in the industry, that is, one side is provided with a male side axial exhaust port stop edge 5, and the other side is provided with a female side axial exhaust port stop edge 6. The butterfly port can be matched with the rotor tooth type to control the position of the rotor compression exhaust; the middle part of the missing structure is also provided with a low-pressure stage rotor 9 high-pressure meshing area stop edge 7, which can prevent the communication of the low-pressure side and the high-pressure side gas passages of the rotor at the end of the rotor compression. The end surface (left side) of the flange surface 1 is provided with mounting structures such as positioning pin holes, connecting screw holes and the like.

[0023] As shown in Figure 3 , 4 As shown, the new structure of the low-pressure stage exhaust end bearing seat 10 provided by the application only includes the female rotor bearing cavity 3, the male rotor bearing cavity 2, the exhaust orifice 4 and the mounting structure. No pipeline-shaped exhaust cavity flow channel is arranged behind the exhaust orifice 4, and a completely open structure layout is adopted, and the overall structure is extremely compact. At the same time, the flange surface 1 of the low-pressure stage exhaust end bearing seat 10 is connected with the exhaust end surface of the low-pressure stage body 8 through pin positioning, and the entire low-pressure stage exhaust end bearing seat 10 is arranged in the shell of the high-pressure stage body 11. The size of the low-pressure stage exhaust end bearing seat itself is reduced, and the size of the outer flange surface is also reduced as a whole, that is, the overall size of the compressor is greatly reduced.

[0024] As shown in Figure 4 The application also provides an embodiment of a single-machine two-stage screw compressor, which includes a low-pressure stage body 8 internally provided with a low-pressure stage rotor 9, a high-pressure stage body 11 internally provided with a high-pressure stage rotor 12, a high-pressure stage exhaust end bearing seat 13, and the low-pressure stage exhaust end bearing seat 10 provided by the application. The low-pressure stage exhaust end bearing seat 10 is arranged at the intake end inside the shell of the high-pressure stage body 11, and the flange surface 1 of the low-pressure stage exhaust end bearing seat 10 is connected with the exhaust end surface of the low-pressure stage body 8, so that the exhaust end surface of the low-pressure stage body 8 and the intake end surface of the high-pressure stage body 11 can be directly butted. The refrigeration working medium enters from the suction port on the right side of the low-pressure stage body 8 and is discharged from the exhaust port on the left side of the high-pressure stage exhaust end bearing seat 13.

[0025] Please refer to Figure 4 The low-pressure stage exhaust end bearing seat 10 is assembled in the high-pressure stage cylinder block 11, is not involved in the matching size chain of the two-stage shell of the compressor complete machine, only corresponds to the assembly of the low-pressure stage cylinder block 8 shell, reduces the number of axial cumulative positioning, effectively reduces the cumulative error of assembly, improves the assembly precision, and further improves the transmission performance of the compressor. At the same time, one sealing end face is also reduced, that is, from three sealing end faces to two sealing end faces, thereby reducing the leakage risk and improving the reliability of the compressor operation. In addition, since the traditional single-machine double-stage screw compressor, the refrigeration working medium needs to pass through the exhaust cavity flow channel of the exhaust end bearing seat after being compressed by the low-pressure stage rotor and enter the high-pressure stage cylinder block, the internal flow channel of the complex structure of the exhaust end bearing seat will increase the along-the-way loss of the refrigeration working medium flow, thereby affecting the efficiency of the compressor. The long exhaust cavity flow channel is omitted after the exhaust orifice 4 of the low-pressure stage exhaust end bearing seat 10 of the present application, and a completely open structure layout is adopted, the refrigeration working medium passes through the exhaust orifice 4 of the flange surface 1 after being compressed by the low-pressure stage, and directly enters the high-pressure stage cylinder block 11, the flow is simple and unobstructed, the along-the-way loss is small, and the efficiency of the compressor is improved.

[0026] The present application also provides an air conditioning system with the single-machine double-stage screw compressor.

[0027] The above is only an embodiment of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An exhaust end bearing housing, comprising a flange face, a male rotor bearing cavity and a female rotor bearing cavity disposed on one side of the flange face, characterized in that, The flange face is also provided with an open exhaust port corresponding to the exhaust end of the screw compressor rotor. The open exhaust port is a structure formed by the edge of the flange face being missing towards the center of the flange face. The flange face is connected to the exhaust end face of the low-pressure stage of the screw compressor. The exhaust end face of the low-pressure stage is directly connected to the intake end face of the high-pressure stage. After being compressed by the low-pressure stage, the refrigerant passes through the open exhaust port of the flange face and directly enters the high-pressure stage.

2. The exhaust end bearing housing as described in claim 1, characterized in that, The structure formed by the missing part has a male axial exhaust port baffle on one side and a female axial exhaust port baffle on the other side.

3. The exhaust end bearing housing as described in claim 1, characterized in that, The missing part of the structure has a rotor high-pressure meshing zone baffle in the middle.

4. The exhaust end bearing housing as described in claim 1, characterized in that, The flange face is provided with a positioning and mounting structure.

5. A screw compressor, comprising a low-pressure stage housing and a high-pressure stage housing, characterized in that, It also includes the exhaust end bearing housing as described in any one of claims 1 to 4, wherein the exhaust end bearing housing is disposed inside the high-pressure stage housing, and the flange face of the exhaust end bearing housing is connected to the exhaust end face of the low-pressure stage housing.

6. The screw compressor as described in claim 5, characterized in that, The exhaust end face of the low-pressure stage body is directly connected to the air intake end face of the high-pressure stage body.

7. An air conditioning system, characterized in that, It has a screw compressor as described in claim 5 or 6.

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