CN117597520A

CN117597520A - Water chilling unit

Info

Publication number: CN117597520A
Application number: CN202280047129.0A
Authority: CN
Inventors: 曹成林; 魏文鹏; 丛辉; 冯旭; 马振
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2022-04-02
Filing date: 2022-06-30
Publication date: 2024-02-23
Also published as: WO2023184768A1

Abstract

A water chiller, comprising a housing (100); the compressor is arranged in the casing (100), the casing (100) comprises a volute (110) and a motor casing (120), and the motor casing (120) comprises a casing body (121), a front end cover (122) and a rear end cover (123); a first rotating shaft (130) with a first front bearing (131) and a first rear bearing (132) at both ends; a second rotating shaft (140) with bearing assemblies at both ends; a first oil storage part (150) above the casing (100); the second oil storage component (160) is arranged in the shell (100) and communicated with the first oil storage component (150) through an oil supply oil way (900), and an oil supply device (191) and a cooling device (800) are arranged on the oil supply oil way (900); bearing lubrication oil passage formed in a wall of the casing (100) and communicating the first oil storage member (150) with each bearing, comprising at least: a first lubrication circuit communicating the first oil reservoir member (150) with the first rotating shaft bearing assembly; a second rear lubrication oil passage (300) communicating the first oil reservoir member (150) and the first rear bearing (132): and a second front lubrication oil path (400) which communicates the first oil storage member (150) with the first front bearing (131).

Description

Water chilling unit

The present disclosure claims priority from chinese patent application No. 202210344359.5 filed on the 2022 month 04 and 02; priority of China patent application with application number 202220752590.3 filed on the year 2022, month 04 and day 02; priority of China patent application with application number 202220752633.8 filed on the year 2022, month 04 and day 02; priority of China patent application with application number 202220753029.7 filed on the year 2022, month 04 and day 02; priority of China patent application with application number 202220752641.2 filed on the year 2022, month 04 and day 02; priority of China patent application with application number 202220753142.5 filed on the year 2022, month 04 and day 02; priority of China patent application with application number 202220753067.2 filed on the year 2022, month 04 and day 02; the entire contents of which are incorporated by reference into the present disclosure.

Technical Field

The disclosure relates to the technical field of water chilling units, in particular to an improvement of a water chilling unit structure.

Background

The lubricating system used by the centrifugal compressor of the related-art water chilling unit is mostly an external oil way, and particularly, an oil way cooling device is arranged, the cooling device adopts an external plate heat exchanger which is connected with a plurality of external pipelines after heat exchange with a refrigerant pipe group, the plurality of external pipelines are respectively inserted into holes at different positions of a shell of the centrifugal compressor so as to lubricate bearings at different positions through lubricating oil dropped from oil pipes, the external pipelines are usually fastened and sealed by threads or gaskets, and the joint is at risk of sealing failure during long-term operation of the compressor, particularly, the joint of an oil cooler, the oil pipe and the refrigerant cooling pipeline is easy to leak, and the normal operation of the unit is affected; in addition, during the production, transportation, installation and maintenance processes of the compressor, the external pipeline is easy to collide, and the external pipeline is likely to break when serious, so that the attractive appearance of the compressor is affected, and the normal operation of a unit is also affected.

Disclosure of Invention

The present disclosure provides a water chiller. The water chiller includes: a housing; the compressor is arranged in the shell; the first rotating shaft is positioned in the shell, and two ends of the first rotating shaft are provided with a first front bearing and a first rear bearing; a second rotating shaft, which is positioned in the shell and is provided with a bearing assembly; the water chiller further comprises: a first oil storage part above the casing; the second oil storage component is communicated with the first oil storage component through an oil supply oil way in the shell, the oil supply oil way comprises a main oil supply section, the main oil supply section is formed in the shell wall, and a cooling device is arranged on the main oil supply oil way; bearing lubrication oil path passageway, it includes at least: the first lubricating oil way is communicated with the first oil storage component and the bearing assembly and is formed in the shell wall and a bearing seat corresponding to the bearing assembly; the second rear lubrication oil path is formed on the shell wall and the rear bearing seat and is communicated with the first oil storage component and the first rear bearing: the second front lubrication oil way is formed on the shell wall and the front bearing seat and is communicated with the first oil storage component and the first front bearing; the oil flowing out of the second oil storage part enters the first oil storage part through the cooling device, and the oil in the first oil storage part enters the bearing assembly, the first rear bearing and the first front bearing respectively through the first lubricating oil way, the second rear lubricating oil way and the second front lubricating oil way to lubricate the bearing assembly, the first rear bearing and the first front bearing.

Drawings

In order to more clearly illustrate the technical solutions in the present disclosure, the drawings that are required to be used in some embodiments of the present disclosure will be briefly described below. However, the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained from these drawings by those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the products, the actual flow of the methods, the actual timing of the signals, etc. according to the embodiments of the present disclosure.

FIG. 1 is a schematic view of an overall structural cycle of a water chiller according to some embodiments;

FIG. 2 is a perspective view of a centrifugal compressor of a chiller according to some embodiments;

FIG. 3 is a cross-sectional view of the internal structure of a centrifugal compressor of a chiller according to some embodiments;

FIG. 4 is a cross-sectional view of the overall internal oil circuit structure of a centrifugal compressor of a chiller according to some embodiments;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a schematic diagram of a first high speed shaft lubrication oil passage of a centrifugal compressor of a chiller according to some embodiments;

FIG. 7 is a schematic diagram of a first lubrication circuit configuration of a centrifugal compressor of a chiller according to some embodiments;

FIG. 8 is a schematic structural view of a low speed front seal structure of a centrifugal compressor of a chiller according to some embodiments;

FIG. 9 is a schematic diagram of a second rear lubrication circuit of a centrifugal compressor of a chiller according to some embodiments;

FIG. 10 is a schematic structural view of a low speed rear seal structure of a centrifugal compressor of a chiller according to some embodiments;

FIG. 11 is a schematic diagram of the structure of the inside of a motor casing of a centrifugal compressor of a chiller according to some embodiments;

FIG. 12 is a schematic structural view of a cooling device of a centrifugal compressor of a chiller in accordance with some embodiments disposed inside a motor casing;

FIG. 13 is a schematic diagram of one implementation of an oil supply circuit for a centrifugal compressor of a chiller according to some embodiments;

FIG. 14 is a second schematic diagram of an implementation of an oil supply circuit for a centrifugal compressor of a chiller according to some embodiments;

FIG. 15 is a schematic diagram III of an implementation of an oil supply circuit for a centrifugal compressor of a chiller according to some embodiments;

FIG. 16 is a schematic diagram of an implementation of an oil supply circuit for a centrifugal compressor of a chiller according to some embodiments;

FIG. 17 is a schematic structural view of an oil feed seal structure of an oil supply circuit of a centrifugal compressor of a chiller according to some embodiments;

fig. 18 is a schematic diagram illustrating a connection structure between a cooling device and a refrigerant circulation system of a centrifugal compressor of a chiller according to some embodiments.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", "some examples", "and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

In describing some embodiments, the expression "connected" and its derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited to the disclosure herein.

At least one of "A, B and C" has the same meaning as at least one of "A, B or C," both include the following combinations of A, B and C: a alone, B alone, C alone, a combination of a and B, a combination of a and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

As used herein, the term "if" is optionally interpreted to mean "when … …" or "at … …" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if determined … …" or "if detected [ stated condition or event ]" is optionally interpreted to mean "upon determining … …" or "in response to determining … …" or "upon detecting [ stated condition or event ]" or "in response to detecting [ stated condition or event ]" depending on the context.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

As used herein, "about," "approximately" or "approximately" includes the stated values as well as average values within an acceptable deviation range of the particular values as determined by one of ordinary skill in the art in view of the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system).

As used herein, "parallel", "perpendicular", "equal" includes the stated case as well as the case that approximates the stated case, the range of which is within an acceptable deviation range as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, "parallel" includes absolute parallel and approximately parallel, where the acceptable deviation range for approximately parallel may be, for example, a deviation within 5 °; "vertical" includes absolute vertical and near vertical, where the acceptable deviation range for near vertical may also be deviations within 5 °, for example. "equal" includes absolute equal and approximately equal, where the difference between the two, which may be equal, for example, is less than or equal to 5% of either of them within an acceptable deviation of approximately equal.

A refrigerant circulation system mainly formed by connecting a centrifugal compressor, an evaporator 700, a condenser 600 and a throttling device (not shown in the figure) through a refrigerant pipe group; the centrifugal water chilling unit also comprises a lubrication system, an electric control system and the like.

Fig. 1 is a schematic circulation diagram of an overall structure of a water chiller in the disclosed embodiment, and the working principle of the water chiller is as shown in fig. 1, water vapor in a user room enters an evaporator 700 along a waterway through an air conditioner terminal, and at this time, the temperature of water is higher, and water at the user side is called chilled water. The low-pressure refrigerant liquid in the evaporator 700 exchanges heat with chilled water to become refrigerant vapor, the refrigerant vapor enters the compressor through the compressor inlet, the high-speed rotation of the compressor impeller compresses the low-pressure refrigerant vapor into high-pressure refrigerant vapor, the high-pressure refrigerant vapor enters the condenser 600 to exchange heat with cooling water in the condenser 600 to become high-pressure refrigerant liquid, the cooling water pipe is connected with an outdoor cooling tower, and water in the cooling tower exchanges heat with air. The high-pressure refrigerant liquid is changed into low-pressure refrigerant liquid through the throttling device, and enters the evaporator 700 to exchange heat with chilled water, so that circulation is realized.

The lubrication system primarily provides lubrication to the centrifugal compressor. The electric control system controls the start and stop of the rotating speed of the compressor, detects the running pressure and temperature of the unit and opens and closes various valve elements on the unit.

Fig. 2 is a perspective structural view of a centrifugal compressor of a water chiller according to an embodiment of the present disclosure, fig. 3 is a sectional view of an internal structure of the centrifugal compressor of the water chiller according to an embodiment of the present disclosure, and fig. 4 is a sectional view of an internal oil path structure of the centrifugal compressor of the water chiller according to an embodiment of the present disclosure. As shown in fig. 2, 3 and 4, the centrifugal compressor main body structure includes: a housing 100;

a first rotating shaft 130, the first rotating shaft 130 being a low-speed shaft, a first front bearing 131 and a first rear bearing 132 being disposed at both ends of the first rotating shaft 130, respectively;

the second rotating shaft 140, the second rotating shaft 140 is a high-speed shaft, and bearing assemblies supported at both ends of the second rotating shaft 140.

In some embodiments of the present disclosure, the casing 100 includes a motor casing 120 and a scroll case 110, contact surfaces of the motor casing 120 and the scroll case 110 may be coupled by screws, wherein the motor casing 120 includes a casing body 121 and front and rear end caps 122 and 123 disposed at front and rear ends thereof.

The shell body 121 is a cylinder, and is made of cast iron or the like, and the front end cover 122 is correspondingly blocked and fixed on the front side of the shell body 121; the rear end cover 123 is disposed at a rear side position of the case body 121 correspondingly.

The volute 110 is in butt-joint fit with the front end cover 122, and a communicating accommodating space is formed between the motor casing 120 and the volute 110.

A motor cavity is formed inside the motor housing 120, a volute 110 cavity is formed inside the volute 110, and the two cavities are mutually communicated.

When the structure is set, a first rotating shaft 130 is arranged in the motor casing 120, the first rotating shaft 130 is a low-speed shaft, a low-speed front bearing seat 133 and a low-speed rear bearing seat 134 are respectively arranged on the front end cover 122 and the rear end cover 123, a low-speed front bearing 131 and a low-speed rear bearing 132 are respectively arranged on the low-speed front bearing seat 133 and the low-speed rear bearing seat 134, and two ends of the first rotating shaft 130 are correspondingly connected with the first front bearing 131 and the first rear bearing 132 in a rotating manner.

The low speed front bearing housing 133 and the low speed rear bearing housing 134 may be integrally formed with the front end cover 122 and the rear end cover 123, respectively, when formed.

The first rotating shaft 130 extends along the length direction of the motor casing 120, part of the first rotating shaft extends into the volute 110 in butt joint with the motor casing 120, a transmission gear set is arranged in the volute 110 and at least comprises a large gear and a small gear meshed with the large gear, the large gear is connected to the first rotating shaft 130, the small gear is connected to the second rotating shaft 140, and the large gear is meshed with the small gear.

A second front bearing 142 and a second rear bearing 141 for supporting the second rotating shaft 140 are provided at both ends of the second rotating shaft 140, and the impeller structure is further connected to the second rotating shaft 140.

The second front bearing 142 is installed in the high-speed front bearing housing 144, and the second rear bearing 141 is installed in the second rear bearing housing 143. The second front bearing housing 144 and the second rear bearing housing 143 may be directly integrally formed with the scroll case 110.

The second rear bearing 141 is located below the first front bearing 131 and is disposed up and down with the first front bearing 131.

During operation, the second rotating shaft 140 and the first rotating shaft 130 rotate and rub against the bearings, and if the bearing assembly does not operate well for a long period of time, the bearings will wear, so the water chiller in this embodiment needs to lubricate the bearings connected to the second rotating shaft 140 and the first rotating shaft 130.

In order to solve the problem that the lubricating oil circuit of the related art is easy to damage due to the adoption of the external lubricating oil circuit, the lubricating oil system is optimized in the embodiment, and the whole lubricating oil circuit is designed in an internal manner, so that all the lubricating oil circuits are positioned in the shell 100.

To achieve the storage of the lubricating oil, the first oil storage part 150 and the second oil storage part 160 for storing the lubricating oil are correspondingly arranged at the time of arrangement in the embodiment.

To ensure a fully built-in arrangement of the entire oil passage, in some embodiments of the present disclosure, the first oil storage member 150 is arranged above the interior of the casing 100 when arranged.

In a specific arrangement, the first oil storage component 150 is arranged at a top position of the scroll casing 110, the first oil storage component is cast into the scroll casing 110, and the first oil storage component 150 is arranged at the top of the scroll casing 110 so that it delivers lubricating oil to bearings located in the cavities of the scroll casing 110 and the motor cavity below it.

Fig. 13 is a schematic diagram of an oil supply path of a centrifugal compressor of a cold water machine set according to an embodiment of the present disclosure. As shown in fig. 3 and 13, the second oil storage member 160 communicates with the first oil storage member 150 through an oil supply passage 900, the oil supply passage 900 is built in the casing 100, an oil supply device 191 is connected to the oil passages of the second oil storage member 160 and the first oil storage member 150, and the lubricating oil is supplied to the first oil storage member 150 through the oil supply device 191.

In some embodiments of the present disclosure, the oil supply device 191 is an oil pump to provide lubrication oil delivery pumping power.

The oil supply path 900 of the first oil storage part 150 and the second oil storage part 160 is further provided with an oil filter 192 connected with an oil pump, which is mainly used for filtering oil impurities in lubricating oil and preventing impurities in the lubricating oil from blocking a lubricating oil pipeline, so that normal lubrication of the bearing is affected.

In some embodiments, the second oil storage component 160 is disposed at a bottom location of the scroll casing 110 opposite the first oil storage component 150, which is a main oil supply tank, with a large amount of lubricating oil present therein.

By adopting the arrangement mode of arranging the first oil storage component 150 and the second oil storage component 160 in the volute 110, the arrangement mode of arranging the oil tank for mainly storing oil is realized, and the condition that the oil tank is knocked and damaged in transportation is avoided.

In some embodiments of the present disclosure, referring to fig. 3, 4 and 6, the water chiller is further provided with:

bearing lubrication oil path passageway, it includes at least:

a first lubrication oil path, which is a high-speed lubrication oil path and is used for communicating the first oil storage part 150 with the second rotating shaft bearing assembly to lubricate the second rotating shaft bearing assembly; a second rear lubrication oil passage 300, which is a low-speed rear lubrication oil passage 300 that communicates the first oil reservoir 150 and the first rear bearing 132 to lubricate the first rear bearing 132;

a second front lubrication oil path 400, wherein the second front lubrication oil path 400 is a low-speed rear lubrication oil path, and is used for communicating the first oil storage part 150 with the first front bearing 131 so as to lubricate the first front bearing 131; the lubricating oil flowing out of the second oil storage part 160 enters the first oil storage part 150 through the cooling device 800, and the lubricating oil in the first oil storage part 150 enters the bearing assembly, the first rear bearing 132, and the first front bearing 131 through the first lubricating oil path, the second rear lubricating oil path 300, and the second front lubricating oil path 400, respectively, and lubricates them.

Since the temperature of the lubricating oil flowing out of the second oil reservoir 160 is high, it is necessary to lubricate each bearing after cooling it by the cooling device 800. The first oil storage part 150 plays a role of bearing the cooled lubricating oil in the middle, and is used for conveying the lubricating oil cooled by the cooling device 800 to the first lubricating oil circuit, the second rear lubricating oil circuit 300 and the second front lubricating oil circuit 400 through the bearing lubricating oil circuit channels respectively. Through the structure of the lubrication oil path communicated with the first oil storage part 150, lubrication of the second rotating shaft bearing assembly and the first rotating shaft bearing assembly is realized, and the lubrication effect of the bearings is ensured.

Moreover, since the lubricating oil is positioned at the top, the lubricating oil of the first lubricating oil path, the second rear lubricating oil path 300 and the second front lubricating oil path 400 can smoothly and rapidly flow downwards to the corresponding bearing positions under the action of gravity and oil pressure when flowing, so that the lubricating effect on each bearing is ensured.

When the embodiment of the disclosure is set, the first lubrication oil path, the second front lubrication oil path 400 and the second rear lubrication oil path 300 which form the bearing lubrication oil path channel are formed on the wall of the casing 100.

In the present disclosure, molded on the wall of the housing 100 means that it may be molded into the wall of the housing 100, molded on the inside wall of the housing 100, or molded on the outside wall of the housing 100.

In some embodiments, the first lubrication circuit may be formed within a wall of the housing 100.

A second rear lubrication oil passage 300 for lubricating the first rear bearing 132 is disposed in the outer wall of the casing 100 or the wall of the casing 100.

The second front lubrication passage 400 may be disposed in the wall of the casing 100 or on the inner wall surface of the casing 100.

When the water chiller is installed, the first oil storage component 150 and the second oil storage component 160 for storing oil are built in the casing 100, meanwhile, the main oil supply section 911 of the oil supply path connected between the first oil storage component 150 and the second oil storage component 160 is built in the casing wall, the cooling device 800 is correspondingly arranged on the main oil supply section 911 and is also built in the casing 100, and thus the built-in installation of the oil storage components, the main oil supply section 911 and the cooling device 800 is realized.

The first lubricating oil circuit, the second front lubricating oil circuit 300 and the second rear lubricating oil circuit 400 which form bearing lubricating oil circuit channels for lubricating bearings are formed in the shell wall and the corresponding bearing seats, the lubricating oil circuits are all integrally arranged on the shell 100 of the compressor through the arrangement, the built-in and integrated arrangement of the oil circuits on the shell 100 of the compressor is realized, external oil connecting pipelines are not required to be additionally connected, and the problems that a plurality of external pipelines are required to be connected by adopting an external oil cooler, and the pipelines are easy to leak and collide and damage are avoided.

In addition, the first lubricating oil way, the second front lubricating oil way 400 and the second rear lubricating oil way 300 are respectively communicated with the corresponding bearings, so that the lubricating oil can be lubricated to the corresponding bearings under the guiding action of the oil ways, and the bearing lubricating effect is better.

Through this kind of setting with the whole integrated setting of lubrication circuit on the casing 100 wall to for directly shaping the oil circuit on the casing 100 wall, need not to additionally connect external oil connecting line, realized the built-in of oil circuit and with the integrated setting of compressor casing 100, effectually avoided adopting the oil pipe mode of external connection to lead to the pipeline wearing and tearing, the production of the problem of destruction easily.

Wherein, first lubrication oil way includes: and a bearing assembly of the second rotating shaft 140.

Lubrication of the bearing assembly of the second rotating shaft 140 is mainly achieved through a first lubrication oil path, which communicates the first oil storage part 150 and the bearing assembly, for lubrication of the bearing assembly; in some embodiments, the bearing assembly is a high speed bearing assembly.

In some embodiments of the present disclosure, the first lubrication oil passage includes:

the first high-speed shaft lubricating oil channel 200, which communicates with the second front bearing 142 and the first oil storage part 150, is formed by butting a first high-speed closed flow passage 210 formed on the inner wall of the volute casing 110 and a second high-speed closed flow passage 220 formed on the high-speed front bearing seat 144, and is disposed perpendicular to the second front bearing 142.

The first high-speed shaft lubricating oil channel 200 comprises a first raised rib group formed on the inner wall of the volute 110, wherein the first raised rib group comprises first raised ribs, 2 first raised ribs are oppositely arranged, are arranged in a manner of extending from top to bottom along the high-speed direction of the volute 110, and extend to the position of the second front bearing seat 144.

The first protruding rib group further includes: the first connecting ribs are connected with 2 first protruding ribs to seal the 2 first protruding ribs and the inner wall of the volute 110 to form a first high-speed sealing flow channel 210.

A second closed flow passage 220 formed in the second front bearing housing 144, the second front bearing housing 144 having an annular high-speed bearing mounting portion.

The bearing mounting portion of the second rotating shaft 140 penetrates from the outer side surface to the inner side surface position in the radial direction thereof.

The second closed flow channel 220 is in butt-fit with the first closed flow channel 210.

In lubricating the second front bearing 142, the lubricating oil flowing out of the first oil reservoir 150 enters the first closed flow path 210 into the second closed flow path, and then enters the second front bearing 142 to lubricate the second front bearing 142.

In some embodiments of the present disclosure, the first high-speed closed flow channel 210 and the second closed flow channel 220 are collinear, so that the entire first high-speed shaft lubricating oil channel 200 formed by the first high-speed closed flow channel is perpendicular to the second front bearing 142, so that in the case of power failure and shutdown of the motor, the lubricating oil can lubricate the second front bearing 142 under the action of gravity, and the condition that the second front bearing 142 is worn is avoided.

The second oil reservoir 160, when arranged, is arranged at a position below the second front bearing 142 and the second rear bearing 141, with a length extending at least from the second front bearing 142 to the second rear bearing 141.

There is a fit gap between the second front bearing 142 and the second rotating shaft 140, and when the second rotating shaft 140 rotates at a high speed, the lubricating oil entering the second front bearing 142 is thrown into the second oil storage part 160 located below through the fit gap between the two, so as to realize the oil return function of the lubricating oil.

A second high-speed shaft lubrication oil passage 500, the second high-speed shaft lubrication oil passage 500 communicating with the first high-speed shaft lubrication oil passage 200 and the second rear bearing 141, respectively.

The second high-speed shaft lubrication oil passage 500 is a separate lubrication oil path leading from the first high-speed shaft lubrication oil passage 200, which drains part of the lubrication oil in the first high-speed shaft lubrication oil passage 200 into the second high-speed shaft lubrication oil passage 500 and then lubricates the second rear bearing 141 in communication therewith.

In some embodiments of the present disclosure, the second high speed shaft lubrication oil passage 500 includes:

the first high-speed rear oil passage 510 is formed on the front wall surface of the scroll casing 110, extending and bending downward from the first high-speed shaft lubricating oil passage 200.

When the first high-speed rear oil passage 510 is connected, it is connected to one side of the first closed flow passage 210, and includes a first bending oil passage 511, a second protruding rib group 512, a second bending oil passage 514, a third protruding rib group 513 and a second rear oil passage 520, which are mutually communicated.

The first bending oil duct 511 is transversely arranged on the inner wall of the volute 110, and is formed by encircling a second raised rib group 512 on the inner wall of the volute 110 and the inner wall of the volute 110.

The second protruding rib group 512 includes 2 second protruding ribs and second connecting ribs connecting the second protruding ribs, and the second connecting ribs are enclosed with the 2 second protruding ribs and the inner wall of the volute 110 to form a first bending oil duct 511.

The second bending oil passage 514 is vertically arranged and is formed by surrounding the third protruding rib group 513 on the inner wall of the volute 110 and the inner wall of the volute 110.

The third protruding rib group 513 includes 2 third protruding ribs and third connecting ribs that connect the third protruding ribs, and the third connecting ribs are enclosed with 2 second protruding ribs and the inner wall of the volute 110 to form a second bending oil duct 514.

A second rear oil passage 520 is formed in the second rear bearing housing 143, the second rear bearing housing 143 being disposed at a rear wall surface position of the scroll case 110.

A second rear bearing 141 installation cavity is formed in the second rear bearing housing 143, and a second rear oil passage 520 penetrates into the second rear bearing 141 installation cavity from an outer side surface of the second rear bearing housing 143 so that lubricating oil is directly introduced therethrough to the second rear bearing 141 installed therein to lubricate the second rear bearing 141.

The connecting oil duct 530 is formed by sealing ribs 531, extends from the front wall surface of the volute 110 to the rear wall surface of the volute 110, is suspended in the cavity of the volute 110, and has two ends respectively communicated with the first rear oil duct 510 and the second rear oil duct 520.

The sealing ribs 531 include a plurality of sealing ribs, and extend along the direction from the front wall of the volute 110 to the rear wall of the volute 110, the sealing ribs 531 are connected to form a sealed connecting oil duct 530, and the lubricating oil flowing out of the first rear oil duct 510 on the front wall of the volute 110 can be conveyed into the second rear oil duct through the connecting oil duct 530 to lubricate the second rear bearing 141.

Similarly, there is a fit gap between the second rear bearings 141 and the second rotating shaft 140, and the second oil storage member 160 is disposed below the second rear bearings 141, so that during the high-speed rotation of the second rotating shaft 140, the lubricating oil located at the fit gap between the two is thrown into the second oil storage member 160 below, so as to collect and return the lubricating oil.

To achieve lubrication of the first rear bearing 132, in some embodiments of the present disclosure, a second rear lubrication oil passage 300, a casing oil passage 310, and a first rear bearing seat oil passage are also correspondingly disposed inside the centrifugal compressor.

A second rear lubrication oil passage 300 communicating the first oil reservoir member 150 and the first rear bearing 132, the second rear lubrication oil passage 300 including:

a casing oil passage formed in a wall of the casing 100, wherein the casing 100 flow passage extends from the first oil storage part 150, through the scroll casing 110, the front end cover 122 to the casing body 121, extends along the length direction of the casing body 121 to one end of the casing body 121 far from the first oil storage part 150, and extends from the end of the casing body 121 to the first rear bearing seat 134 along the radial direction of the rear end cover 123;

the first rear bearing block oil passage is formed in the first rear bearing block 134 and is in butt-joint fit with the housing oil passage to introduce lubricating oil into the first rear bearing 132.

In some embodiments of the disclosure, the casing oil passage includes:

the first rear flow passage 311 is formed in the wall of the scroll case 110 or on the inner side wall of the scroll case 110 to communicate with one side of the first oil storage part 150.

The abutting flow passage 312 is formed in the wall of the front cover 122, extends in the axial direction of the case body 121, and communicates with the first rear flow passage 311.

A second rear flow passage 313 formed on a wall of the housing body 121, extending in the axial direction of the motor housing 120, communicates with the abutting flow passage 312.

A third rear runner 314 is formed in the rear end cover 123 and communicates with the first rear bearing housing oil passage.

The rear cover 123 includes: the end cover body and the annular end cover bulge which is arranged on the conical vertical end cover body and extends from one side of the end cover body.

A first rear bearing seat 134 for mounting the first rear bearing is formed in the annular end cap boss.

The first rear bearing housing 134 is directly integrally formed with the rear end cap 123 at the time of molding.

The third back flow channel 314 includes: the end cap body flow passage 3141, the end cap body flow passage 3141 being arranged in the radial direction of the end cap body 1231.

An end cap boss flow channel 3142 disposed within the end cap boss wall, comprising: a first inclined flow passage 3143, a second inclined flow passage 3144, and a first rear bearing block oil passage 3145.

The first inclined flow channels 3143 are arranged obliquely downward in the radial direction of the end cover body 1231.

The second inclined flow path 3144 communicates with the first inclined flow path 3143, extends in the axial direction of the end cover boss, and is inclined toward the center side of the rear bearing housing installation chamber.

The first rear bearing block oil passage 3145 communicates with the second inclined flow passage 3144, and is arranged in the radial direction of the annular end cover boss 1232.

To achieve oil return of the lubricating oil entering the first rear bearing 132, an oil return passage 320 is also provided inside the centrifugal compressor.

The oil return path 320 includes an oil inlet 321 disposed at the bottom of the casing body 121, a motor cavity is formed in the casing body 121, the oil inlet 321 is communicated with the motor cavity, the oil return path 320 is partially formed in a wall at the bottom of the casing body 121, and is partially formed on an inner wall of the volute 110, and extends from the oil inlet 321 to the position of the second oil storage component 160 along the axial direction of the casing body 121 and is communicated with the second oil storage component 160.

The first rear bearing 132 is disposed in the case body 121 at a certain interval from the bottom of the case body 121, i.e., the first rear bearing 132 is located above the oil inlet 321.

When the first rotating shaft 130 on the first rear bearing 132 rotates, the first rotating shaft will throw out the lubricating oil in the gap between the first rear bearing 132 and the first rotating shaft 130, and the thrown lubricating oil will fall into the bottom position of the housing body 121 under the action of gravity.

In this embodiment, through the oil inlet 321 which is disposed at the bottom of the casing body 121 and is communicated with the motor cavity, lubricating oil can enter the oil inlet 321, and flows back to the inside of the second oil storage component 160 through the oil return oil path 320 which is communicated with the oil inlet 321, so as to realize oil return.

In some embodiments of the present disclosure, the oil inlet 321 is an oil inlet opening in the housing body 121.

In some embodiments of the present disclosure, the return oil path 320 includes the following components. The casing oil return path 322 formed in the inner wall of the casing body 121, the casing oil return path 322 extending in the casing axis direction is provided in communication with the oil inlet portion 321.

An end cap oil return passage 323 formed in the front end cap 122, the end cap oil return passage 323 being in abutment with the housing oil return passage 322.

A volute return oil passage 324 formed in the wall of the volute 110 in communication with the end cap return oil passage 323 and the second reservoir member 160, the volute return oil passage 324, the end cap return oil passage 323 and the housing return oil passage 322 being collinear.

In other embodiments of the present disclosure, the shell oil return path 322 is formed on the outer wall of the shell body 121, and is formed by providing a protruding rib plate on the outer wall of the shell body 121 and matching the shell body 121, so as to avoid interference with the installation of the internal structure of the shell body 121.

Because the oil return path 320 is required to pass through the machining matching surface of the front end cover 122 and the volute 110 of the motor during backflow, the problem of leakage of lubricating oil is caused because the machining surface is easy to have poor sealing contact, therefore, an oil return sealing structure for sealing the oil path is arranged at the butt joint matching position of the front end cover 122 and the volute 110 and the end cover oil return path 323 and the volute oil return path 324, and the butt joint matching position of the oil path is sealed through the sealing structure, so that the effect of preventing the leakage of the lubricating oil is achieved.

The oil return sealing structure comprises:

the oil return convex part 330 is arranged on the periphery of the volute oil return path 324, the oil return concave part 340 is arranged on the periphery of the end cover oil return path 323, the oil return convex part 330 is inserted into the oil return concave part 340, and the contact matching end surface of the oil return convex part 330 and the oil return concave part 340 is provided with a first oil return sealing piece 350 encircling the periphery of the oil path butt joint matching position.

In some embodiments of the present disclosure, the oil return seal is an oil return seal.

A second oil return seal 360 is also provided at the contact mating surface of the front end cap 122 and the volute 110. In some embodiments of the present disclosure, the first/second oil return seal is a sealing ring, which when provided, may provide a recessed groove in the end face of the volute 110, the sealing ring fitting within the recessed groove and being compressed between the volute 110 and the front end cap 122.

By arranging the concave-convex matching structure at the oil duct butt-joint matching position and increasing the arrangement mode of the oil return sealing piece at the concave-convex matching structure, the sealing effect of the oil duct at the machining contact surface is ensured.

The front end cover 122 and the volute 110 of the peripheral ring at the butt joint position of the first rear runner 311 and the butt joint runner 312 are provided with a low-speed rear sealing structure 370 for sealing an oil path, and the low-speed rear sealing structure 370 is the same as the oil return sealing structure and will not be described herein.

The sealing effect is enhanced by the second oil return seal 360 provided on the front face and the volute 110.

In some embodiments of the present disclosure, a protruding part 1211 is formed on an outer wall of the case body 121, the protruding part 1211 is arranged to extend along a length direction of the case body 121, a hollow cavity is formed inside the protruding part 1211, and a closed second back flow channel 313 is formed between the protruding rib plate and the outer wall of the case body 121.

By providing the protruding member 1211 on the outer wall of the casing body 121 to cooperate with the outer wall of the casing body 121 to form the second rear flow passage 313, a passage for conveying lubricating oil is not formed inside the casing body 121, avoiding the problem of interference with the mounting structure mounted in the motor casing 120 due to the arrangement on the inner wall of the casing body 121, and reducing occupation of the inner space of the motor casing 120.

In some embodiments of the present disclosure, the raised rib is formed by a plurality of raised ribs, comprising: vertical ribs are provided on the outer side wall of the vertical casing body 121, an accommodating space is formed between the vertical ribs, and transverse ribs connected between the vertical ribs are connected with the outer wall of the casing body 121 in a matching manner to form the closed second back flow channel 313.

In other embodiments of the present disclosure, the protruding rib plate is a directly formed U-shaped bent plate, which may be welded and fixed to the outer wall of the case body 121 when connected.

In other embodiments of the present disclosure, the second rear flow channel 313 is formed in the wall of the case body 121, and the second low-speed flow channel is spaced apart from the outer surface of the case body 121 by 2-3mm.

On the premise that the wall thickness of the housing body 121 can satisfy the use strength, the second back flow channel 313 may be formed inside the wall of the housing body 121 so as to flow from the inside of the wall of the housing body 121 when the housing is installed, and the housing body 121 is also not interfered by the mounting components and structures assembled inside the housing body 121.

The second front lubrication oil passage 400 includes: communicating the first oil reservoir 150 with said first front bearing 131;

a housing oil passage 410 formed in a wall of the casing 100, the housing oil passage 410 extending from the first oil storage part 150 and extending from the scroll casing 110 to the front end cover 122, and extending in a radial direction of the front end cover 122 to the first front bearing housing 133;

and a first front bearing housing oil passage formed in the first front bearing housing 133 and in butt-fit with the housing oil passage 410 for introducing lubricating oil into the first front bearing 131.

The housing oil passage 410 of the second front lubrication oil passage 400 includes a first front flow passage 411 and a second front flow passage 412 that are sequentially communicated.

The first front runner 411 is connected with one side of the first oil storage part 150 and is transversely arranged in the wall of the volute 110;

the second front flow channel 412 is formed in the front end cover 122, is butted with the first front flow channel 411 and is bent downward to extend along the radial direction thereof, and is disposed perpendicular to the low-speed front bearing seat 133.

The second front flow channel 412 includes a first bending section and a second bending section, where the first bending section is abutted with the first front flow channel 411 and is disposed transversely.

The second bending section is disposed perpendicular to the first bending section and radially disposed along front end cap 122.

By arranging the second front flow passage 412 in a manner perpendicular to the front bearing housing 133, the lubricating oil can flow downward rapidly by gravity for lubrication.

The first front bearing seat oil passage is in butt joint with the second front flow passage 412, penetrates into a cavity of the first front bearing 131 for installing the first front bearing 131 from the outer side surface along the radial direction of the front bearing seat 133, and is collinear with the second front flow passage 412, so that lubricating oil can rapidly enter the first front bearing 131 to lubricate the first front bearing 131 under the action of gravity.

To enhance lubrication of the second rear bearing, in some embodiments of the present disclosure, an auxiliary lubrication oil passage is also provided inside the centrifugal compressor.

When lubrication is performed, the first oil storage part 150 is located at the uppermost part of the scroll 110 of the compressor, the lubrication oil in the first oil storage part 150 flows into the second front flow passage 412 through the first front flow passage 411 in the second front lubrication oil passage 400 under the action of gravity and oil pressure, then flows into the third front flow passage to lubricate the first front bearing 131, and the lubrication oil for which the front bearing lubrication is completed continuously flows into the second rear bearing housing 143 oil passage through the auxiliary connection oil passage 430 communicating with the first front lubrication oil, so as to lubricate the second rear bearing 141.

The lubrication effect on the second rear bearing 141 can be enhanced by the auxiliary lubrication oil passage.

The second oil storage member 160 is disposed from an extending portion along the axial direction of the scroll casing 110, and is located below the first front bearing 131 and the second rear bearing, and is at least capable of receiving lubricating oil thrown from a gap between the second rear bearing and the second rotating shaft 140.

A first front sealing structure 420 is formed on the front end cover 122 and the scroll case 110 corresponding to the butt-joint position of the first front flow passage 411 and the second front flow passage 412, the first front sealing structure 420 including:

A first front boss 421 located on the volute 110 around the first front flow passage 411;

first front concave portion 422 is formed on front end cap 122 around second front flow channel 412.

The first front protruding portion 421 is inserted into the first front recessed portion 422, and a first front sealing member 423 surrounding the oil path butt-joint position is disposed at a contact-fit end surface of the first front protruding portion 421 and the first front recessed portion 422.

In some embodiments, a first front boss 421 is provided on front end cap 122 around second front flow path 412, and a first front recess 422 is provided on volute 110 around first front flow path 411.

A second front sealing element 424 is also arranged at the contact matching surface of the front end cover 122 and the volute casing 110, an embedded groove is formed on the end surface of the volute casing 110, the second front sealing element 424 is assembled in the embedded groove to be protruded out of the embedded groove, and after the assembly is completed, the second front sealing element 424 is pressed between the volute casing 110 and the front end cover 122.

By arranging the concave-convex matching structure at the oil duct butt-joint matching position and increasing the arrangement mode of the first sealing piece at the concave-convex matching structure, the sealing effect of the oil duct at the machining contact surface is ensured.

The sealing effect is enhanced by the second front seal 424 provided on the front face and the scroll casing 110.

In order to cool the lubricating oil delivered from the second oil reservoir 160 by the oil pump, a cooling device 800 is further provided in this embodiment to ensure that the lubricating oil delivered to the first oil reservoir 150 is cooled.

The oil pump needs to oil outwardly from the second oil storage part 160 at the bottom, and the oil temperature inside the oil tank of the second oil storage part 160 at the bottom position is too high, so that the oil must be cooled to perform the next lubrication.

The cooling device 800 is disposed in the casing 100, is connected to the oil supply passage 900 of the first oil reservoir member 150 and the second oil reservoir member 160, and has a cooling passage formed therein through which lubricating oil can flow.

The condenser 600 includes:

the first refrigerant branch pipe 820 has a first injection part at an end of the first refrigerant branch pipe 820, and the first refrigerant branch pipe 820 can inject refrigerant to the cooling channel through the wall of the casing 100 to exchange heat with the lubricating oil flowing through the cooling channel.

The cooling device 800 in this embodiment may be directly built in the casing 100 when in installation, so as to implement the built-in of the cooling device 800, and effectively avoid the problem of leakage caused by the influence of the change of environmental factors on the pipe joint of the cooling device 800 due to long-term operation.

In some embodiments, the water chiller is in a normal working state, the oil pump starts to work, the lubricating oil in the second oil storage component 160 is conveyed outwards, the temperature of the lubricating oil conveyed from the second oil storage component 160 is higher, when the lubricating oil is conveyed to the first oil storage component 150, the lubricating oil flows through the cooling channel of the cooling device 800, at this time, the refrigerant flowing out of the first refrigerant branch pipe 820 in the condenser 600 can be sprayed to the cooling channel through the first spraying part, so that the refrigerant can exchange heat with the lubricating oil passing through the refrigerant, and the heat of the lubricating oil is absorbed after the heat exchange of the refrigerant, so that the temperature of the lubricating oil is reduced, and the low-temperature cooling of the lubricating oil is realized.

The cooling device 800 in this embodiment directly uses the existing refrigerant in the unit and the refrigerant sprayed from the condenser 600 to perform heat exchange to cool the lubricating oil, so that the cooling device can cool the lubricating oil without adopting an external plate heat exchanger structure in the related art, and the production and working hour costs are reduced.

In some embodiments of the present disclosure, the motor cavity is formed with a stator-rotor assembly accommodating part 170 for accommodating the stator-rotor assembly of the motor far from the volute casing 110 side and a cooling device accommodating part 180 near the volute casing 110 side, the cooling device 800 is arranged in the cooling device accommodating part 180, and the length of the cooling device 800 is 1/4-1/3 of the length of the motor casing 120.

When the cooling device is arranged, the motor cavity can be formed into two parts, namely a stator-rotor assembly accommodating cavity part and a cooling device accommodating cavity part, and the cooling device 800 is arranged inside the cooling device accommodating cavity part close to one side of the volute 110 so as to facilitate the arrangement and connection of an internal oil circuit.

The stator and rotor assembly accommodating cavity part is used for installing and fixing the stator and rotor assembly.

The cooling device 800 is disposed at the front end of the inner wall of the motor casing 120, and occupies 30-450 mm, for example 228.6mm, of the length of the motor casing 120.

In some embodiments of the present disclosure, the cooling device 800 includes a spiral coil disposed along a length direction of the motor casing 120 in a spiral manner, where the spiral coil is disposed in a manner of being attached to an inner wall of the motor casing 120, and has an inner diameter smaller than an inner diameter of the motor casing 120, and the spiral coil includes a plurality of spiral tube sections sequentially connected, and a space between adjacent spiral tube sections is equal or unequal.

The spiral coil pipe can enable the spiral cooling channel to be formed inside the spiral cooling channel, when lubricating oil flows into the spiral cooling channel, the lubricating oil can flow along the spiral cooling channel in a spiral mode, the flowing time is longer, the flowing time is equivalent to the time of the lubricating oil flowing inside the spiral cooling channel, the contact time of the lubricating oil sprayed out of the first cooling medium branch pipe 820 is prolonged, and the cooling effect of the lubricating oil is improved.

In some embodiments of the present disclosure, the first refrigerant branch pipe 820 is a first refrigerant copper pipe, and the first injection part is a first injection port formed at an end thereof.

In some embodiments of the present disclosure, the spiral coil diameter is one of 500-600 mm, such as 540mm; the inner diameter of the spiral coil is one of 15-30 mm, for example 25.4mm, the required length of the spiral coil is one of 3-30 m, for example 15m, and the number of turns of the spiral coil is one of 2-15 turns, for example 9 turns. The spiral coil is made of copper.

The use of the oil cooling coil replaces the original external plate heat exchanger, and the production and working hour costs are reduced.

In some embodiments of the present disclosure, the cooling device 800 includes a plurality of bending sections arranged in a wave shape, the plurality of bending sections are sequentially connected, and the distances between adjacent bending sections are the same or different.

The bending pipe sections which are arranged in a wave shape from top to bottom can also prolong the flowing time of the lubricating oil in the bending pipe sections, and improve the cooling effect of the lubricating oil.

In some embodiments of the present disclosure, to achieve the mounting and fixing of the cooling device 800, a mounting bracket is fixedly provided on the inner wall of the motor casing 120, the cooling device 800 is clamped on the mounting bracket,

The mounting bracket can directly adopt the existing bracket structure, and the description is omitted here.

Alternatively, the cooling device 800 may be directly welded to the inner wall of the motor case 120.

In some embodiments of the present disclosure, the condenser 600 further comprises:

the second refrigerant branch pipe 830 has a second injection part at the end of the second refrigerant branch pipe 830, and the second refrigerant branch pipe 830 can inject refrigerant to the stator and the rotor of the motor cavity through the wall of the motor casing 120 to absorb heat of the stator and the rotor. The second refrigerant branch pipe 830 is a second refrigerant copper pipe, and the second injection part is a second injection port, which can be used for injecting heat exchange to the stator and rotor assembly to cool the stator and rotor assembly.

In some embodiments of the present disclosure, further comprising:

and a refrigerant conveying pipe 840 connected between the motor cavity and the evaporator 700 for conveying the refrigerant, which exchanges heat with the lubricating oil and the stator and rotor assembly, to the inside of the evaporator 700.

In order to recycle the sprayed refrigerant, a refrigerant conveying pipeline 840 is correspondingly connected between the motor cavity and the evaporator 700, the refrigerant sprayed to the cooling device 800 and the stator and rotor assembly is vaporized due to heat absorption, and the vaporized refrigerant can flow back into the evaporator 700 through the refrigerant conveying pipeline 840.

In some embodiments of the present disclosure, a first through portion disposed through the motor casing 120 is provided on the motor casing 120, the first through portion corresponds to the cooling device 800, and the first refrigerant branch pipe 820 passes through the first through portion and faces the cooling device 800;

and a second penetrating part penetrating the motor case 120, the second penetrating part corresponding to the stator and rotor assembly, the second refrigerant branched pipe 830 penetrating the second penetrating part and being disposed toward the stator and rotor assembly.

The first through-hole is a first through-hole, the second through-hole is a second through-hole, and the first refrigerant branch pipe 820 and the second refrigerant branch pipe 830 can respectively pass through the first through-hole and the second through-hole to spray the refrigerant to the cooling device 800 and the stator and rotor assembly.

In some embodiments of the present disclosure, the inner diameter of the first refrigerant tube 820 is one of 6-24 mm; the second refrigerant branch pipe 830 has an inner diameter of 6-24mm, the first refrigerant branch pipe 820 has a refrigerant flow rate of 2-10L/min, for example, 6L/min, and the second refrigerant branch pipe 830 has a refrigerant flow rate of 2-14L/min, for example, 8L/min.

The chiller further includes an oil supply circuit 900.

In order to make the oil supply path 900 connected between the first oil storage part 150 and the second oil storage part 160 mostly realize the embedment of the oil path structure, reduce the problems of the damage of the oil path pipe joint and the damage and leakage of the oil pipe caused by the influence of the climate factors such as the frost formation of the environment, which may be caused by adopting the external oil path structure, the oil supply path 900 structure is set in this embodiment, so that the main oil supply section 911 of the main oil supply path 910 for main oil supply is arranged inside the casing 100, so as to reduce the leakage of the lubricating oil which may be caused by the external oil path as far as possible.

In some embodiments of the present disclosure, the oil supply passage 900 includes: a main oil supply passage 910 connected between the first oil reservoir member 150 and the oil filter 192; to deliver the lubricant oil filtered by the oil filter 192 into the first oil storage part 150.

The main oil supply passage 910 is a main oil supply section constituting an oil supply passage 900 between the first oil reservoir member 150 and the second oil reservoir member 160, and is a main oil passage for transporting lubricating oil.

A main oil supply section 911 is formed in the wall of the housing 100.

The connection oil passage 920 is connected between the oil pump and the oil filter 192.

Meanwhile, in order to realize the connection of the oil paths between the oil pump and the oil filter 192, a connecting oil path 920 is correspondingly arranged, and the connecting oil path 920 is generally shorter in length when being arranged, and only can meet the function of conveying lubricating oil in a short distance.

The cooling device 800 is connected to the main oil supply section 911 and is used for cooling the lubricating oil on the main oil supply section 911.

The lubricating oil in the second oil reservoir 160 can be cooled by the cooling device 800 and then delivered to the inside of the first oil reservoir 150.

When the oil supply device is arranged, the main oil supply section 911 of the main oil supply oil path 910 for mainly conveying lubricating oil is built in and formed inside the wall of the casing 100, so that the problems of oil path pipeline damage and leakage caused by the external mode of the oil supply oil path 900 are effectively avoided.

In some embodiments of the present disclosure, the main oil supply segment 911 is the entire main oil supply path 910, which is inside the casing 100 that is fully disposed when disposed, and in some embodiments, the main oil supply segment 911 includes:

the first main oil path 9111 is located below the cooling device 800, is in butt joint with the oil filter 192, extends upwards from the wall of the bottom of the volute 110, and is in butt joint with the input port of the cooling device 800 through the inner wall of the front end cover 122 and the inner wall of the shell body 121 after being bent upwards;

in some embodiments of the present disclosure, the first main oil passage 9111 includes:

a first volute 110 section formed in the volute 110 wall and formed by bending from the bottom and extending outwards;

a first front end cap 122 section that interfaces with the first volute 110 section, a first housing body 121 section that interfaces with the first front end cap 122 section;

the second main oil path 9112 is in butt joint with the output port of the cooling device 800, extends upward from the inner wall of the casing body 121, bends, and communicates with the first oil storage member 150 through the inner wall of the front end cover 122 and the inner wall of the volute 110.

Second main oil passage 9112 includes: the second casing body 121 section, the second front end cover 122 section and the second volute 110 section are sequentially communicated.

To achieve the embedment of the entire oil supply path 900, in some embodiments of the present disclosure, the oil pump is embedded in the second oil storage component 160, the connecting path 920 is correspondingly embedded in the volute 110, and at this time, the connecting path 920 is also completely embedded in the volute 110, so that all the oil supply paths 900 are completely embedded, and high embedment centralization is achieved.

In some embodiments of the present disclosure, the oil pump is mounted on the outer wall of the scroll casing 110, and the connection oil path 920 is located outside the casing 100.

That is, when the oil pump is installed, the short connecting oil passage 920 may be arranged outside, and the oil pump may be arranged outside, so that the oil pump can be maintained.

In some embodiments of the present disclosure, the main oil supply circuit 910 includes a main oil supply section 911 and a connecting oil section 912, the connecting oil section 912 connecting the oil filter 192 and the main oil supply section 911.

The main oil supply section 911 includes:

a third main oil path 9113, which is formed in the wall of the case body 121 by abutting with the inlet of the cooling device 800 and extending upward from the inside of the case body 121;

fourth main oil path 9114 is in butt joint with the outlet of cooling device 800, extends upwards from the inner wall of housing body 121 and bends, and then is communicated with first oil storage component 150 through the inner wall of front end cover 122 and the inner wall of volute 110.

In some embodiments of the present disclosure, fourth main oil path 9114 includes: a fourth housing body 121 segment formed within the housing body 121, the fourth end cap segment formed within the front end cap 122; the fourth volute 110 section is formed in the volute 110, and the fourth volute 110 section, the fourth volute 110 section and the fourth volute section are mutually in butt joint communication.

In some embodiments of the present disclosure, the connecting oil segment 912 is disposed outside the casing 100 and communicates with the third main oil path 9113.

The oil pump is built in the second oil storage part 160, and the connecting oil path 920 is correspondingly built in the volute 110.

The length of the connecting oil section 912 is shorter, and the connecting oil section 912 is mainly used for playing a connecting role, and meanwhile, the connecting oil circuit 920 is arranged in the volute 110 in a built-in mode, so that the connecting oil circuit 920 is built-in, and the damage and leakage of the connecting oil circuit 920 are avoided.

In some embodiments of the present disclosure, the connecting oil segment 912 is disposed outside the casing 100 and is in communication with the third main oil path 9113; the oil pump is assembled on the outer wall of the scroll casing 110, and the connecting oil path 920 is located outside the casing 100.

The connecting oil way 920 is arranged externally, the oil pump is arranged externally, and the oil pump can be replaced and maintained conveniently.

In addition, although the connecting oil section 912 and the connecting oil path 920 are externally arranged, the main oil supply section 911 with a longer main oil supply function is formed by an internal structure, and the occurrence of easy leakage and damage of the oil supply path 900 caused by complete external arrangement of the pipelines is still reduced to a great extent.

To enhance sealing of the oil passages, in some embodiments of the present disclosure, oil inlet sealing structures are respectively provided on the peripheral ring of the first main oil passage 9111, the peripheral ring of the second main oil passage 9112, and the peripheral ring of the fourth main oil passage 9114 where the front end cover 122 and the scroll casing 110 are in butt joint.

In some embodiments of the present disclosure, the oil feed sealing structure includes:

an oil inlet boss 931 formed on one of the front end cover 122 or the scroll case 110;

an oil inlet recess 932 formed on the other of the front end cover 122 and the scroll case 110, the oil inlet protrusion 931 being inserted into the oil inlet recess 932, and a first oil inlet seal 933 being provided on a mating contact surface of the oil inlet protrusion 931 and the oil inlet recess 932.

The first oil inlet sealing member 933 is a sealing ring, and double sealing of an oil path at the butt joint and matching position of the front end cover 122 and the volute 110 is realized through the matching of the concave-convex matching structure and the sealing ring, so that the sealing effect is improved, and the problem of oil leakage is avoided.

A second oil feed seal 934 is also provided where the front end cover 122 and the volute 110 cooperate.

In some embodiments of the present disclosure, the length of the main oil supply section 911 is greater than the length of the connecting oil section 912, and the length of the connecting oil section 912 is 1/20-1/30 of the length of the main oil supply section 911.

The foregoing description of the preferred embodiments of the present disclosure is not intended to limit the disclosure in any way, and any person skilled in the art may make modifications or alterations to the disclosed embodiments using the technical disclosure described above. Any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present disclosure, which do not depart from the technical substance of the present disclosure, still fall within the protection scope of the technical solution of the present disclosure.

Claims

A chiller, comprising:

a housing comprising a housing wall;

the compressor is arranged in the shell;

the first rotating shaft is positioned in the shell, and two ends of the first rotating shaft are provided with a first front bearing and a first rear bearing;

a second rotating shaft, which is positioned in the shell and is provided with a bearing assembly;

the water chiller further comprises:

a first oil storage part disposed above the casing;

the second oil storage component is arranged in the shell and is communicated with the first oil storage component through an oil supply circuit, the oil supply circuit comprises a main oil supply section, the main oil supply section is formed in the shell wall, and a cooling device is arranged on the main oil supply circuit;

bearing lubrication oil path passageway, it includes at least:

the first lubricating oil way is communicated with the first oil storage component and the bearing assembly and is formed in the shell wall and a bearing seat corresponding to the bearing assembly;

the second rear lubrication oil path is formed on the casing wall and the seat of the first rear bearing and is communicated with the first oil storage component and the first rear bearing:

a second front lubrication oil passage formed in the housing wall and the seat of the first front bearing, and communicating the first oil reservoir member and the first front bearing;

The oil flowing out of the second oil storage part enters the first oil storage part through the cooling device, and the oil in the first oil storage part sequentially passes through the first lubricating oil circuit, the second rear lubricating oil circuit and the second front lubricating oil circuit to be respectively fed into the bearing assembly, the first rear bearing and the first front bearing for lubricating the bearing assembly, the first rear bearing and the first front bearing.
The chiller of claim 1, wherein the housing comprises a volute and a motor casing, the motor casing comprises a casing body, a front end cover, and a rear end cover, the bearing assembly comprises a second front bearing and a second rear bearing disposed at both ends of the second shaft, the bearing housing comprises a second front bearing housing and a second rear bearing housing, and the first lubrication circuit comprises:

the first high-speed shaft lubricating oil channel is communicated with the second front bearing and the first oil storage component, is formed by butt joint of a first high-speed closed flow channel formed on the inner wall of the volute and a second high-speed closed flow channel formed on the second front bearing seat, and is perpendicular to the second front bearing;

and the second high-speed shaft lubricating oil channel is respectively communicated with the first high-speed shaft lubricating oil channel and the second rear bearing.
The chiller of claim 2, wherein the second shaft lubrication oil passage comprises:

The first rear oil duct is formed on the front wall surface of the volute and is formed by extending downwards from the first oil storage component and bending;

the second rear oil duct is formed in the second rear bearing seat;

the connecting oil duct is formed by enclosing sealing ribs, extends from the front wall surface of the volute to the rear wall surface of the volute, is connected between the front wall surface of the volute and the second rear bearing seat and is communicated with the first rear oil duct and the second rear oil duct.
The chiller of claim 1, wherein the housing comprises a volute and a motor housing, the motor housing comprising a housing body, a front end cover, and a rear end cover, the low speed rear lubrication circuit comprising:

the shell oil passage is formed on the shell wall, extends from the first oil storage part to the shell body, extends to one end of the shell body far away from the first oil storage part along the length direction of the shell body, and extends from the end of the shell body to the first rear bearing seat along the radial direction of the rear end cover;

the first rear bearing seat oil duct is formed in the first rear bearing seat and is in butt joint fit with the shell oil duct so as to introduce lubricating oil into the first rear bearing.
The water chiller of claim 4, wherein the water chiller further comprises:

the oil return oil way, the oil return oil way is including setting up the oil feed portion in shell body bottom, is formed with the motor cavity in the motor casing, oil feed portion and motor cavity intercommunication, oil return oil way part forms in the wall of shell body bottom, and part forms on the spiral case inner wall, follow oil feed portion extends to second oil storage part position department and with second oil storage part intercommunication along shell body axis direction.
The chiller of claim 1, wherein the housing comprises a volute and a motor housing, the motor housing comprising a housing body, a front end cap, and a rear end cap, the first front lubrication circuit comprising:

a first front flow passage formed in the volute wall;

the second front runner is formed in the front end cover and is arranged in an extending way along the radial direction of the front end cover;

and the third front runner is formed in the first front bearing seat.
The water chiller of claim 1, wherein the water chiller further comprises:

the cooling device is positioned in the shell and connected to the oil supply oil path, and a cooling channel through which lubricating oil can flow is formed in the cooling device;

the condenser includes:

the first refrigerant branch pipe is provided with a first injection part at the end part, and the first refrigerant branch pipe can inject refrigerant to the cooling channel through the shell wall so as to exchange heat with lubricating oil flowing through the cooling channel.
The water chiller of claim 1, wherein the oil supply circuit comprises:

a main oil supply passage connected between the first oil storage member and the oil filter; comprising the following steps:

the main oil supply section is formed in the shell wall;

the connecting oil way is connected between the oil pump and the oil filter;

And the cooling device is connected to the main oil supply section and is used for cooling lubricating oil on the main oil supply section.
The chiller of claim 8, wherein the main oil supply section comprises:

the first main oil way is positioned below the cooling device, is in butt joint with the oil filter, extends upwards from the wall of the bottom of the volute, and is in butt joint with the input port of the cooling device through the inner wall of the front end cover and the inner wall of the shell body after being bent;

the second main oil way is in butt joint with an output port of the cooling device, extends upwards from the inner wall of the shell body and is communicated with the first oil storage component through the inner wall of the front end cover and the inner wall of the volute.
The chiller of claim 8, wherein the main oil supply section comprises:

the third main oil way is in butt joint with the inlet of the cooling device and is formed in the motor casing wall and extends upwards from the motor casing wall;

and the fourth main oil way is in butt joint with the outlet of the cooling device, extends upwards from the inner wall of the shell body, bends and is communicated with the first oil storage component through the inner wall of the front end cover and the inner wall of the volute.