CN216429947U - Exhaust end bearing seat and screw compressor and air conditioning system with same - Google Patents

Abstract

The utility model discloses an exhaust end bearing frame and have helical-lobe compressor, air conditioning system of this bearing frame. The exhaust end bearing seat comprises a flange surface, a male rotor bearing cavity and a female rotor bearing cavity which are arranged on one side of the flange surface, and an exhaust hole is formed in the flange surface. The exhaust end bearing seat is arranged in the high-pressure stage machine body and is connected with the exhaust end of the low-pressure stage machine body, and the exhaust end face of the low-pressure stage machine body is directly butted with the air inlet end face of the high-pressure stage machine body, so that the size of the compressor is reduced; an accurate positioning installation surface is reduced, and accumulated positioning deviation is reduced, so that the operation performance of the compressor is improved. The built-in setting of exhaust end bearing frame does not regard as the external seal unit, has reduced the sealed terminal surface of a connection to reduce the leakage risk, promoted the reliability of compressor operation. In addition, the structure of the bearing seat at the exhaust end is simplified, an exhaust cavity flow passage with a long rear surface of an exhaust hole is omitted, the layout is completely open, exhaust is smoother, and the energy efficiency of the compressor is improved.

Description

Exhaust end bearing seat and screw compressor and air conditioning system with same

Technical Field

The utility model relates to a fluid conveying equipment especially relates to a screw compressor, the air conditioning system who has this screw compressor that is used for the bearing frame of screw compressor exhaust end and has this exhaust end bearing frame.

Background

The exhaust end bearing block is an essential core part in the screw compressor and is generally used for mounting and positioning a support bearing at the exhaust end of a rotor of the screw compressor, setting a servo drive oil cylinder and an exhaust port of the compressor, fixing an oil content filter screen and the like. As shown in fig. 1, a conventional exhaust-end bearing housing generally includes a flange surface (a housing end surface) 01, a female rotor bearing chamber 02, a male rotor bearing chamber 03, a spool oil chamber 04, an exhaust chamber 05, an oil return passage, an oil supply passage, and the like provided on one side of the flange surface. The existing exhaust end bearing block has other additional functions besides two core functions of installing and positioning a bearing and setting an axial orifice. Therefore, the size of the compressor is large, the structure is complex, and the smoothness of the compressor exhaust duct is affected. For example, in a single two-stage compressor, due to the two pairs of rotors of high and low pressure stages, the radial and axial dimensions of the compressor are larger, and especially, the axial dimension is larger than that of a common single compressor. Therefore, when the existing exhaust end bearing seat is used for an ultra-high efficiency single-machine two-stage compressor type, the compressor is inconvenient to install and relatively poor in performance.

Please refer to fig. 2, which is a schematic diagram of a connection structure of a single two-stage screw compressor. Typically it is shown axially as: the connection mode of the low-pressure stage machine body (internally provided with a low-pressure stage rotor) 06-the low-pressure stage exhaust end bearing seat 07-the high-pressure stage machine body (internally provided with a high-pressure stage rotor) 08-the high-pressure stage exhaust end bearing seat 09. The refrigeration working medium enters from the air suction port 06 of the right low-pressure stage machine body and is discharged from the air exhaust port 09 of the left high-pressure stage exhaust end. Due to errors caused by machining accuracy, assembly accuracy and thermal expansion, the rotor and the end face of the bearing block at the exhaust end are rubbed and collided, so that faults are caused. During installation, the end face of the machine body and the end face of the bearing seat of the exhaust end need to be accurately positioned and connected by a positioning pin, the double-screw compressor and the screw compressor need to be axially positioned and connected in multiple stages, errors at all places are overlapped, and finally, a large accumulated error of coaxiality is generated. When the accumulated error is too large, the bearings at the two ends of the rotor cannot meet the requirement of coaxiality, and the rotation and the meshing of the rotor, the stable torque transmission of the coupler and the stable torque output of the motor can be influenced. Meanwhile, the problems of noise, vibration improvement, rotor abrasion and the like can be caused, and the locking of the male and female rotors can be caused in severe cases, so that the compressor can not normally run. In addition, the end faces where each component is butted against in the axial direction need to be sealed, so that excessive butted end faces also increase the possibility of gas leakage, thereby reducing the reliability of the compressor.

Therefore, how to overcome the defects that the existing two-stage screw compressor has a complex structure and low installation precision and affects the running performance of the compressor is an urgent problem to be solved in the industry.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve that there is the helical-lobe compressor structure complicated, the installation accuracy is not high, influences the problem of compressor running performance, provides a simple structure, the high exhaust end bearing frame of installation accuracy and have the helical-lobe compressor of this exhaust end bearing frame, have this helical-lobe compressor's air conditioning system.

The utility model provides a pair of exhaust end bearing frame, including the flange face, locate the male rotor bearing chamber and the female rotor bearing chamber of this flange face one side, the flange face still is equipped with the exhaust port.

Preferably, the exhaust port is an open exhaust port corresponding to the exhaust ends of a pair of rotors of the screw compressor.

Preferably, the open type exhaust hole is a structure formed by the edge of the flange surface and the middle of the flange surface in a missing mode.

Preferably, the two opposite sides of the structure formed by the deletion are provided with a male side axial exhaust port flange on one side and a female side axial exhaust port flange on the other side.

Preferably, the middle part of the structure formed by the deletion is provided with a flange of a high-pressure meshing area of the rotor.

Preferably, the flange face end face is provided with a positioning and mounting structure.

The utility model also provides a screw compressor, including low pressure level organism, high-pressure level organism, still include the utility model provides an exhaust end bearing frame, this exhaust end bearing frame is located inside the high-pressure level organism casing, exhaust end bearing frame flange face with the exhaust terminal surface of low pressure level organism is connected.

Preferably, the exhaust end face of the low-pressure stage engine body is directly butted with the air inlet end face of the high-pressure stage engine body.

The utility model provides a have the utility model discloses screw compressor's air conditioning system.

The utility model discloses in reducing the radial dimension of exhaust end bearing frame and locating the high-pressure stage organism for low pressure level organism exhaust end face can with the direct butt joint of high-pressure stage organism inlet end face, reduced the axial space of an exhaust end bearing frame, make the radial and axial dimensions of compressor all very reduce, reduced spare part simultaneously, reduced compressor manufacturing cost. Because the exhaust end bearing seat is assembled inside the high-pressure stage machine body, the end face of the exhaust end bearing seat is only independently connected and installed with the exhaust end face of the low-pressure stage shell, and is only positioned in relation to the exhaust end of the rotor shaft system, and is not matched with other units in relation. Therefore, an accurate positioning installation surface can be reduced, the accumulated positioning times are reduced, the accumulation of positioning deviation is effectively overcome, the assembly precision is improved, and the operation performance of the compressor is further improved. Because the exhaust end bearing seat is arranged in the high-pressure stage shell of the pressure-bearing seal in a built-in mode and does not serve as an outer sealing unit, a connected sealing end face is reduced, the leakage risk is reduced, and the operation reliability of the compressor is improved. In addition, the structure of the bearing seat at the exhaust end is simplified, an exhaust cavity flow passage with a long rear surface of an exhaust hole is omitted, the layout is completely open, exhaust is smoother, and the energy efficiency of the compressor is improved.

Drawings

FIG. 1 is a schematic perspective view of a conventional bearing seat at an exhaust end;

FIG. 2 is a schematic view of an axial connection structure of a conventional single-stage two-stage screw compressor;

fig. 3 is a schematic perspective view of an embodiment of a bearing seat of an exhaust end of the present invention;

fig. 4 is a schematic view of an axial connection structure of an embodiment of the single-unit two-stage screw compressor of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

As shown in fig. 3 and 4, the present invention provides an embodiment of a bearing seat for a low-pressure stage of a single-stage two-stage screw compressor. The low-pressure stage exhaust end bearing seat 10 comprises a flange surface 1, and a male rotor bearing cavity 2 and a female rotor bearing cavity 3 which are arranged on one side (right side) of the flange surface 1. The female and male rotor bearing cavities 3, 2 are of a cylindrical structure, and one or more bearings for supporting the exhaust end shaft of the low-pressure stage rotor 9 can be arranged in the cylindrical cavity according to requirements, while another bearing support is arranged corresponding to the air inlet end shaft of the low-pressure stage rotor 9, which is not shown in the figure. The utility model discloses a be equipped with a vent hole 4 on the flange face 1, and vent hole 4 does not set up the exhaust chamber runner of pipeline form at the back. In this embodiment, the exhaust port 4 is an open exhaust port corresponding to the exhaust end of the low-pressure stage rotor 9 of the screw compressor. The open type exhaust hole is a structure formed by the edge of the flange surface 1 missing towards the middle of the flange surface 1. And the two opposite sides of the structure formed by the missing are provided with butterfly ports in the industry, namely, one side is provided with a male side axial exhaust port flange 5, and the other side is provided with a female side axial exhaust port flange 6. The butterfly port can be matched with the rotor tooth shape to control the position of the rotor for compressing and exhausting; the middle part of the structure formed by the loss is also provided with a flange 7 of a high-pressure meshing area of the low-pressure stage rotor, so that the low-pressure side of the rotor can be prevented from being communicated with a high-pressure side air passage when the rotor is compressed. The end face (left side) of the flange face 1 is provided with mounting structures such as positioning pin holes and connecting screw holes.

As shown in fig. 3 and 4, the structure of the low-pressure stage exhaust end bearing seat 10 provided by the utility model only contains the bearing cavities 3 and 2 of the male and female rotors, the exhaust vent 4 and the installation structure. And a pipeline-shaped exhaust cavity flow channel is not arranged behind the exhaust hole 4, and the whole structure is extremely compact by adopting a completely open structure layout. Meanwhile, the flange face 1 of the exhaust end bearing seat is positioned by pins and connected with the end face of the exhaust end of the low-pressure stage machine body 8, the whole exhaust end bearing seat 10 is assembled inside a shell of the high-pressure stage machine body 11, and the exhaust end face of the low-pressure stage machine body 8 is directly butted with the air inlet end face of the high-pressure stage machine body 11. The size of the compressor is reduced, and meanwhile, the size required by an outer flange face is reduced on the whole, namely, the whole size of the compressor is greatly reduced.

As shown in fig. 4, the utility model also provides a unit doublestage screw compressor's embodiment, this compressor include inside low pressure level organism 8 that is equipped with low pressure level rotor 9, inside high pressure level organism 11 and the high pressure level exhaust end bearing frame 13 that is equipped with high pressure level rotor 12, still include the utility model provides a low pressure level exhaust end bearing frame 10. The low-pressure stage exhaust end bearing seat 10 is arranged at an air inlet end inside a shell of the high-pressure stage machine body 11, and a flange face of the low-pressure stage exhaust end bearing seat 10 is connected with an exhaust end of the low-pressure stage machine body 8, so that an exhaust end face of the low-pressure stage machine body 8 is directly butted with an air inlet end face of the high-pressure stage machine body 11. The refrigerating medium enters from the air suction port of the right low-pressure stage machine body 8 and is discharged from the air exhaust port of the left high-pressure stage exhaust end bearing seat 13.

Please refer to fig. 4, the utility model discloses assemble low pressure stage exhaust end bearing frame 10 inside high pressure stage organism 11, in the cooperation size chain of the two-stage casing of not participating in the compressor complete machine, only independently correspond the assembly of 8 casings on the low pressure stage organism, reduced the accumulative total location number of times of axial, reduced the accumulative error of assembly effectively, promoted the assembly precision, and then promoted the rotation performance of compressor. Meanwhile, one sealing end face is reduced, namely, the original three sealing end faces are fewer than two sealing end faces, so that the leakage risk is reduced, and the reliability of the operation of the compressor is improved. In addition, because the traditional single-machine two-stage screw compressor compresses the refrigerant through the low-pressure-stage rotor and then enters the high-pressure-stage machine body through the exhaust cavity flow channel of the exhaust end bearing seat, the flow channel in the exhaust end bearing seat with a complex structure can increase the on-way loss of the refrigerant flowing, and the efficiency of the compressor is affected. And the utility model discloses saved long exhaust chamber runner behind 10 exhaust port 4 of low-pressure stage exhaust end bearing frame, adopted complete open structural configuration, the refrigeration working medium goes out exhaust port 4 that passes flange face 1 after the low-pressure stage compression, directly gets into high-pressure stage organism 11, and the flow is simple unobstructed, and the loss on journey is little to the compressor efficiency has been promoted.

The utility model also provides an air conditioning system who has the utility model discloses unit doublestage screw compressor.

The above description is only an embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. The exhaust end bearing block comprises a flange surface, and a male rotor bearing cavity and a female rotor bearing cavity which are arranged on one side of the flange surface.

2. The exhaust end bearing housing of claim 1, wherein the open exhaust port is a structure formed by the absence of the flange face edge toward the flange face middle.

3. The exhaust end bearing block according to claim 2 wherein said missing formation is provided on opposite sides of the structure with a male side axial exhaust port rib on one side and a female side axial exhaust port rib on the other side.

4. The exhaust end bearing housing of claim 2 wherein said missing formation is provided with a rotor high pressure engagement zone rib at a mid-portion of the structure.

5. The exhaust end bearing housing of claim 1 wherein said flange face end face is provided with a locating mounting formation.

6. A screw compressor comprising a low pressure stage body, a high pressure stage body, and further comprising the exhaust end bearing housing of any one of claims 1 to 5, the exhaust end bearing housing being disposed inside the casing of the high pressure stage body, the exhaust end bearing housing flange face being connected to the exhaust end face of the low pressure stage body.

7. The screw compressor of claim 6, wherein the low pressure stage block discharge end face directly interfaces with the high pressure stage block intake end face.

8. An air conditioning system characterized by having a screw compressor according to claim 6 or 7.

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