WO2023184768A1

WO2023184768A1 - Water chiller unit

Info

Publication number: WO2023184768A1
Application number: PCT/CN2022/103198
Authority: WO
Inventors: 曹成林; 魏文鹏; 丛辉; 冯旭; 马振
Original assignee: 青岛海信日立空调系统有限公司
Priority date: 2022-04-02
Filing date: 2022-06-30
Publication date: 2023-10-05
Also published as: CN117597520A

Abstract

A water chiller unit. The water chiller unit comprises: a casing (100); a compressor arranged in the casing (100), the casing (100) comprising a volute case (110) and a motor casing (120), and the motor casing (120) comprising a casing body (121), a front end cap (122) and a rear end cap (123); a first rotating shaft (130), two ends of which being provided with a first front bearing (131) and a first rear bearing (132); a second rotating shaft (140), two ends of which being provided with bearing assemblies; a first oil storage unit (150) above the casing (100); a second oil storage unit (160) which is built in the casing (100) and communicates with the first oil storage unit (150) by means of an supply oil circuit (900), an oil supply device (191) and a cooling device (800) being arranged on the supply oil circuit (900); and a bearing lubrication oil circuit channel, which is formed on a wall of the casing (100) and via which the first oil storage unit (150) communicates with each bearing, the bearing lubrication oil circuit channel at least comprising: a first lubrication oil circuit, via which the first oil storage unit (150) communicates with a first rotating shaft bearing assembly, a second rear lubrication oil circuit (300), via which the first oil storage unit (150) communicates with a first rear bearing (132), and a second front lubrication oil circuit (400), via which the first oil storage unit (150) communicates with a first front bearing (131).

Description

Chiller

This disclosure claims the priority of the Chinese patent application with application number 202210344359.5 submitted on April 2, 2022; the priority of the Chinese patent application with application number 202220752590.3 submitted on April 2, 2022; April 2022 The priority of the Chinese patent application with application number 202220752633.8 submitted on April 2, 2022; the priority of the Chinese patent application with application number 202220753029.7 submitted on April 2, 2022; the priority of the Chinese patent application submitted on April 2, 2022 with application number The priority of the Chinese patent application 202220752641.2; the priority of the Chinese patent application submitted on April 2, 2022 with the application number 202220753142.5; the priority of the Chinese patent application submitted on April 2, 2022 with the application number 202220753067.2 ;The entire contents of which are incorporated into this disclosure by reference.

Technical field

The present disclosure relates to the technical field of chillers, and in particular to improvements in the structure of chillers.

Background technique

Most of the lubrication systems used in centrifugal compressors of chillers in the related art are external oil circuits. Specifically, an oil circuit cooling device is provided, and the cooling device uses an external plate heat exchanger, which exchanges heat with the refrigerant pipe group. Then it is connected to multiple external pipelines, which are inserted into the holes at different positions of the centrifugal compressor casing to lubricate the bearings at different positions through the lubricating oil dripping from the oil pipes. , external pipelines are usually sealed with threads or gaskets. During long-term operation of the compressor, there is a risk of seal failure at the joints, especially the joints between the oil cooler and the oil pipeline and the refrigerant cooling pipeline. Leakage affects the normal operation of the unit; and during the production, transportation, installation and maintenance of the compressor, it is easy to cause the external pipeline to be bumped, and in severe cases, it may break, which not only affects the appearance of the compressor, but also affects the unit. of normal operation.

Contents of the invention

The present disclosure provides a chiller. The chiller includes: a casing; a compressor placed in the casing; a first rotating shaft located in the casing, with a first front bearing and a first rear bearing provided at both ends; a second rotating shaft located in the casing. A bearing assembly is configured in the casing; the chiller also includes: a first oil storage component above the casing; a second oil storage component in the casing and connected to the first oil storage component. The components are connected through an oil supply line. The oil supply line includes a main oil supply section, which is formed in the casing wall. A cooling device is provided on the main oil supply line; a bearing lubricating oil line channel, which at least includes: A first lubricating oil passage connects the first oil storage component and the bearing assembly and is formed in the bearing seat corresponding to the casing wall and the bearing assembly; a second rear lubricating oil passage is formed in the casing wall and on the rear bearing seat, connecting the first oil storage component and the first rear bearing: a second front lubricating oil path is formed on the casing wall and the front bearing seat, connecting the first oil storage component and the first rear bearing. The first front bearing; the oil flowing out of the second oil storage component enters the first oil storage component through the cooling device, and the oil in the first oil storage component passes through the first lubricating oil passage and the third oil storage component. The second rear lubricating oil channel and the second front lubricating oil channel respectively enter the bearing assembly, the first rear bearing, and the first front bearing to lubricate them.

Description of drawings

In order to explain the technical solutions in the present disclosure more clearly, the drawings required to be used in some embodiments of the present disclosure will be briefly introduced below. However, the drawings in the following description are only drawings of some embodiments of the present disclosure, and those of ordinary skill in the art can also obtain other drawings based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of the present disclosure.

Figure 1 is a schematic diagram of the overall structural cycle of a chiller according to some embodiments;

Figure 2 is a three-dimensional structural view of a centrifugal compressor of a chiller according to some embodiments;

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

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

Figure 5 is an enlarged view of part A of Figure 4;

Figure 6 is a schematic structural diagram of the first high-speed shaft lubricating oil channel of the centrifugal compressor of the chiller according to some embodiments;

Figure 7 is a schematic structural diagram of the first lubricating oil circuit of the centrifugal compressor of the chiller according to some embodiments;

Figure 8 is a schematic structural diagram of a low-speed front seal structure of a centrifugal compressor of a chiller according to some embodiments;

Figure 9 is a schematic structural diagram of the second rear lubricating oil circuit of the centrifugal compressor of the chiller according to some embodiments;

Figure 10 is a structural schematic diagram of a low-speed rear seal structure of a centrifugal compressor of a chiller according to some embodiments;

Figure 11 is a schematic structural diagram of the interior of the motor housing of the centrifugal compressor of the chiller according to some embodiments;

Figure 12 is a schematic structural diagram of the cooling device of the centrifugal compressor of the chiller arranged inside the motor housing according to some embodiments;

Figure 13 is a structural schematic diagram 1 of an embodiment of the oil supply oil circuit of the centrifugal compressor of the chiller according to some embodiments;

Figure 14 is a schematic structural diagram 2 of an embodiment of the oil supply oil circuit of the centrifugal compressor of the chiller according to some embodiments;

Figure 15 is a structural schematic diagram three of an embodiment of the oil supply oil circuit of the centrifugal compressor of the chiller according to some embodiments;

Figure 16 is a schematic structural diagram 4 of an embodiment of the oil supply circuit of the centrifugal compressor of the chiller according to some embodiments;

Figure 17 is a schematic structural diagram of the oil inlet sealing structure of the oil supply oil circuit of the centrifugal compressor of the chiller according to some embodiments;

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

Detailed ways

The technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments provided by this disclosure, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this disclosure.

Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms such as the third person singular "comprises" and the present participle "comprising" are used. Interpreted as open and inclusive, it means "including, but not limited to." In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific "example" or "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 described may be included in any suitable manner in any one or more embodiments or examples.

Hereinafter, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

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

"At least one of A, B and C" has the same meaning as "at least one of A, B or C" and includes the following combinations of A, B and C: A only, B only, C only, A and B The combination of A and C, the combination of B and C, and the combination of A, B and C.

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

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

The use of "suitable for" or "configured to" in this document implies open and inclusive language that does not exclude devices that are suitable for or configured to perform additional tasks or steps.

As used herein, "about," "approximately," or "approximately" includes the stated value as well as an average within an acceptable range of deviations from the particular value, as determined by one of ordinary skill in the art. Determined taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

As used herein, "parallel," "perpendicular," and "equal" include the stated situation as well as situations that are approximate to the stated situation within an acceptable deviation range, where Such acceptable deviation ranges are 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 (ie, the limitations of the measurement system). For example, "parallel" includes absolutely parallel and approximately parallel, and the acceptable deviation range of approximately parallel may be, for example, a deviation within 5°; "perpendicular" includes absolutely vertical and approximately vertical, and the acceptable deviation range of approximately vertical may also be, for example, Deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the difference between the two that may be equal within the acceptable deviation range of approximately equal is less than or equal to 5% of either one, for example.

The refrigerant circulation system is mainly composed of a centrifugal compressor, an evaporator 700, a condenser 600 and a throttling device (not shown in the figure) connected through a refrigerant pipe group; the centrifugal chiller also includes a lubrication system, an electronic control system, etc.

Figure 1 is a schematic diagram of the overall structural cycle of the chiller in an embodiment of the present disclosure. Its working principle is shown in Figure 1. The water vapor in the user's room enters the evaporator 700 along the waterway through the end of the air conditioner. At this time, the temperature of the water is relatively high, and the user The water on the other side is called chilled water. The low-pressure refrigerant liquid in the evaporator 700 exchanges heat with the 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. The cooling water in the condenser 600 and the condenser 600 performs heat exchange to become high-pressure refrigerant liquid. The cooling water pipe is connected to the outdoor cooling tower, and the water in the cooling tower performs heat exchange with the air. The high-pressure refrigerant liquid changes to low-pressure refrigerant liquid through the throttling device and enters the evaporator 700 to exchange heat with the chilled water to achieve circulation.

The lubricating oil system mainly provides lubrication to the centrifugal compressor. The electronic control system controls the start and stop of the compressor speed, detects the operating pressure and temperature of the unit, and opens and closes various valves on the unit.

Figure 2 is a three-dimensional structural view of the centrifugal compressor of the chiller in the embodiment of the present disclosure. Figure 3 is a cross-sectional view of the internal structure of the centrifugal compressor of the chiller in the embodiment of the present disclosure. Figure 4 is a centrifugal compressor of the chiller in the embodiment of the present disclosure. Cross-sectional view of the overall internal oil circuit structure. As shown in Figures 2, 3 and 4, the main structure of the centrifugal compressor includes: casing 100;

The first rotating shaft 130 is a low-speed shaft, and the first front bearing 131 and the first rear bearing 132 are respectively arranged at both ends of the first rotating shaft 130;

The second rotating shaft 140 is a high-speed shaft, and bearing assemblies are 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 volute 110. The contact surfaces of the motor casing 120 and the volute 110 may be connected by screws, wherein the motor casing 120 includes a casing body 121 and an arrangement. There are front end caps 122 and rear end caps 123 at its front and rear ends.

The shell body 121 is a cylinder, and its material is cast iron. 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 correspondingly arranged at the rear side of the shell body 121.

The volute 110 is butt-fitted with the front end cover 122 to form a connected accommodation space between the motor casing 120 and the volute 110 .

A motor cavity is formed inside the motor case 120, and a volute 110 cavity is formed inside the volute 110, and the two cavities are connected to each other.

During structural arrangement, a first rotating shaft 130 is provided inside the motor housing 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 are installed at the front end cover 122 and the rear end cover 123 respectively. 134. A low-speed front bearing 131 and a low-speed rear bearing 132 are respectively provided in the low-speed front bearing seat 133 and the low-speed rear bearing seat 134. The two ends of the first rotating shaft 130 are correspondingly between the first front bearing 131 and the first rear bearing 132. Turn the connection.

The low-speed front bearing seat 133 and the low-speed rear bearing seat 134 can be directly integrated with the front end cover 122 and the rear end cover 123 respectively during molding.

The first rotating shaft 130 extends along the length direction of the motor housing 120, and partially extends from the motor housing 120 into the interior of the volute 110 that is mated with the motor housing 120. A transmission gear set is provided in the volute case 110, and the transmission gear set at least includes The large gear and the small gear mesh with the large gear. The large gear is connected to the first rotating shaft 130 and the small gear is connected to the second rotating shaft 140. The large gear meshes with the small gear.

A second front bearing 142 and a second rear bearing 141 are provided at both ends of the second rotating shaft 140 to support the second rotating shaft 140. The impeller structure is also connected to the second rotating shaft 140.

The second front bearing 142 is installed in the high-speed front bearing seat 144 , and the second rear bearing 141 is installed in the second rear bearing seat 143 . The second front bearing seat 144 and the second rear bearing seat 143 can be directly integrally formed with the volute 110 .

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

During operation, both the second rotating shaft 140 and the first rotating shaft 130 rotate and rub against the bearings. If the bearing assembly does not receive good lubrication during long-term operation, the bearings will wear. Therefore, the chiller in this embodiment The bearings connected on the second rotating shaft 140 and the first rotating shaft 130 need to be lubricated.

In order to solve the problem that the lubricating oil circuits in related technologies are external and the pipelines are easily damaged, in this embodiment, the lubricating oil system is optimized and the entire lubricating oil pipeline is designed to be built-in, so that all lubricating oil circuits are evenly connected. Located inside the casing 100 .

In order to realize the storage of lubricating oil, in this embodiment, a first oil storage component 150 and a second oil storage component 160 for storing lubricating oil are correspondingly provided during installation.

In order to ensure that the entire oil circuit is completely built-in, in some embodiments of the present disclosure, the first oil storage component 150 is arranged above the inside of the casing 100 during installation.

In the specific arrangement, the first oil storage component 150 is arranged at the top position of the volute 110. The first oil storage component 150 is cast into the volute 110, and the first oil storage component 150 is arranged at the top of the volute 110 to facilitate its operation. Lubricating oil is delivered to the bearings in the cavity of the volute 110 and the motor cavity located below it.

Figure 13 is a schematic structural diagram 1 of an implementation of the oil supply oil circuit of the centrifugal compressor of the chiller in the embodiment of the present disclosure. As shown in Figures 3 and 13, the second oil storage component 160 is connected to the first oil storage component 150 through an oil supply oil path 900. The oil supply oil path 900 is built in the casing 100. An oil supply device 191 is connected to the oil line between the component 160 and the first oil storage component 150, and the lubricating oil is delivered to the first oil storage component 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 lubricating oil delivery and pressing power.

The oil supply path 900 of the first oil storage component 150 and the second oil storage component 160 is also provided with an oil filter 192 connected to the oil pump, which is mainly used to filter oil impurities in the lubricating oil and prevent the lubricating oil from being contaminated. Impurities block the lubricating oil pipeline and affect the normal lubrication of the bearings.

In some embodiments, the second oil storage component 160 is arranged at the bottom of the volute 110 and is opposite to the first oil storage component 150 . It is the main oil supply tank and has a large amount of lubricating oil inside.

By arranging both the first oil storage component 150 and the second oil storage component 160 to be built into the volute 110, the internal arrangement of the oil tank that mainly stores oil is realized, thereby avoiding the oil tank from being damaged during transportation. .

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

Bearing lubricating oil channel, which at least includes:

The first lubricating oil path is a high-speed lubricating oil path, which connects the first oil storage component 150 and the second rotating shaft bearing assembly to lubricate the second rotating bearing assembly; the second Rear lubricating oil path 300. The second rear lubricating oil path 300 is a low-speed rear lubricating oil path, which connects the first oil storage component 150 and the first rear bearing 132 to lubricate the first rear bearing 132;

The second front lubricating oil path 400 is a low-speed rear lubricating oil path, which connects the first oil storage component 150 and the first front bearing 131 to lubricate the first front bearing 131 ; Among them, the lubricating oil flowing out of the second oil storage component 160 enters the first oil storage component 150 through the cooling device 800, and the lubricating oil in the first oil storage component 150 passes through the first lubricating oil passage and the second rear lubricating oil passage 300. The second front lubricating oil passage 400 enters the bearing assembly, the first rear bearing 132 and the first front bearing 131 respectively and lubricates them.

The lubricating oil flowing out from the second oil storage component 160 has a relatively high temperature. Therefore, it must be cooled by the cooling device 800 before each bearing is lubricated. The first oil storage component 150 functions as an intermediate carrier of the cooled lubricating oil, and is used to transport the lubricating oil cooled by the cooling device 800 to the first lubricating oil path and the second rear lubricating oil path through the bearing lubricating oil path. Lubricating oil passage 300 and second front lubricating oil passage 400. Through the structure of the lubricating oil path connected with the first oil storage component 150, the lubrication of the second rotating shaft bearing assembly and the first rotating shaft bearing assembly is achieved, ensuring the lubrication effect of the bearings.

Moreover, since it is located at the top, the lubricating oil in the first lubricating oil path, the second rear lubricating oil path 300 and the second front lubricating oil path 400 can flow downward smoothly and quickly under the force of gravity and oil pressure. to the corresponding bearing position to ensure the lubrication effect of each bearing.

When setting up the embodiment of the present disclosure, the first lubricating oil path, the second front lubricating oil path 400 and the second rear lubricating oil path 300 that constitute the bearing lubricating oil path are all formed on the wall of the casing 100 .

In this disclosure, molded on the wall of the casing 100 means that it can be formed in the wall of the casing 100 , on the inner wall of the casing 100 , or on the outer wall of the casing 100 .

In some embodiments, the first lubricating oil passage may be formed within the wall of the housing 100 .

The second rear lubricating oil passage 300 used to lubricate the first rear bearing 132 is arranged on the outer wall of the casing 100 or within the wall of the casing 100 .

The second front lubricating oil passage 400 can be arranged in the wall of the casing 100 or on the inner wall surface of the casing 100 .

When the chiller is installed, the first oil storage component 150 and the second oil storage component 160 for storing oil are built inside the casing 100, and at the same time, the first oil storage component 150 and the second oil storage component 160 are connected to each other. The main oil supply section 911 of the oil supply path between them is built-in and molded in the casing wall. The cooling device 800 is also arranged correspondingly on the main supply section 911 and is also built inside the casing 100 to realize the oil storage components and The main oil supply section 911 and the cooling device 800 are built-in.

In the present disclosure, the first lubricating oil path, the second front lubricating oil path 300 and the second rear lubricating oil path 400 that constitute the bearing lubricating oil path for lubricating the bearings are all molded into the casing wall and the corresponding bearing seat. Through this arrangement, all lubricating oil circuits are integrated into the casing 100 of the compressor, realizing the built-in and integrated setting of the oil circuits on the casing 100 of the compressor, eliminating the need to design external oil connections. Pipes, avoiding the need to connect multiple external pipelines when using an external oil cooler, which can easily cause pipeline leakage, collision, and damage.

In addition, since the first lubricating oil path, the second front lubricating oil path 400 and the second rear lubricating oil path 300 are respectively connected to the corresponding bearings, the lubricating oil can be lubricated to the corresponding bearings under the guidance of the oil path, thereby improving the bearing lubrication effect. better.

Through this arrangement, all the lubricating oil circuits are integrated and arranged on the wall of the casing 100, and the oil circuit is directly formed on the wall of the casing 100, without the need to connect additional external oil connecting pipes, realizing the built-in and The integrated arrangement with the compressor casing 100 effectively avoids the problem of easy wear and damage of the pipeline caused by the use of externally connected oil pipes.

The first lubricating oil passage includes: a bearing assembly of the second rotating shaft 140 .

The lubrication of the bearing assembly of the second rotating shaft 140 is mainly achieved through the first lubricating oil passage, which communicates with the first oil storage component 150 and the bearing assembly to lubricate the bearing assembly; in some embodiments, the The bearing assembly is a high-speed bearing assembly.

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

The first high-speed shaft lubricating oil channel 200 connects the second front bearing 142 and the first oil storage component 150, and is composed of the first high-speed closed flow channel 210 formed on the inner wall of the volute 110 and the second high-speed front bearing seat 144. The high-speed closed flow channels 220 are formed by butt joints and are arranged perpendicularly to the second front bearing 142 .

The first high-speed shaft lubricating oil passage 200 includes a first protruding rib group formed on the inner wall of the volute 110. The first protruding rib group includes two first protruding ribs, and the two first protruding ribs are arranged oppositely. It is arranged extending from top to bottom along the high speed direction of the volute 110 and extends to the position of the second front bearing seat 144 .

The first raised rib group also includes: a first connecting rib, which connects two first raised ribs to close the two first raised ribs and cooperate with the inner wall of the volute 110 to form a first high-speed closed flow channel 210.

The second closed flow channel 220 is formed in the second front bearing seat 144, and the second front bearing seat 144 has an annular high-speed bearing mounting portion.

Along the radial direction of the bearing mounting portion of the second rotating shaft 140, it penetrates from the outer side to the inner side.

The second closed flow channel 220 and the first closed flow channel 210 are butt matched.

When lubricating the second front bearing 142, the lubricating oil flowing out from the first oil storage component 150 enters the first closed flow channel 210, enters the second closed flow channel, and then enters the second front bearing 142 to lubricate the second front bearing 142. Bearing 142 is lubricated.

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 them is arranged perpendicular to the second front bearing 142 , in this way, when the motor is powered off and shut down, the lubricating oil can also lubricate the second front bearing 142 under the action of gravity to avoid wear of the second front bearing 142 .

When arranged, the second oil storage component 160 is arranged below the second front bearing 142 and the second rear bearing 141 , and its length extends at least from the second front bearing 142 to the second rear bearing 141 .

There is a fitting gap between the second front bearing 142 and the second rotating shaft 140. When the second rotating shaft 140 rotates at high speed, the lubricating oil entering the second front bearing 142 will be thrown into the second front bearing 142 through the fitting gap between the two. The second oil storage component 160 is located below to realize the oil return function of lubricating oil.

The second high-speed shaft lubricating oil channel 500 is connected with the first high-speed shaft lubricating oil channel 200 and the second rear bearing 141 respectively.

The second high-speed shaft lubricating oil channel 500 is a branch lubricating oil channel leading from the first high-speed shaft lubricating oil channel 200, which can divert part of the lubricating oil in the first high-speed shaft lubricating oil channel 200 to the second high-speed shaft lubricating oil. In the passage 500, the second rear bearing 141 communicated with the second rear bearing 141 is then lubricated.

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

The first high-speed rear oil passage 510 is formed on the front wall of the volute 110 and is formed by extending 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 bent oil passage 511, a second raised rib group 512, and a second bent oil passage 514 that are connected to each other. , the third raised rib group 513 and the second rear oil passage 520.

The first bent oil passage 511 is arranged transversely on the inner wall of the volute 110 and is formed by the second protruding rib group 512 on the inner wall of the volute 110 and the inner wall of the volute 110 .

The second raised rib group 512 includes two second raised ribs and a second connecting rib connecting the second raised ribs. The second connecting rib cooperates with the two second raised ribs and the inner wall of the volute 110 to form a second connecting rib. A bent oil passage 511.

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

The third raised rib group 513 includes two third raised ribs and a third connecting rib connecting the third raised ribs. The third connecting rib cooperates with the two second raised ribs and the inner wall of the volute 110 to form a third connecting rib. 2. Bend oil passage 514.

The second rear oil passage 520 is formed in the second rear bearing seat 143 , and the second rear bearing seat 143 is arranged at the rear wall surface of the volute 110 .

A second rear bearing 141 installation cavity is formed in the second rear bearing seat 143, and a second rear oil passage 520 penetrates from the outer side of the second rear bearing seat 143 into the second rear bearing 141 installation cavity, so that the lubricating oil can be directly By its introduction into the second rear bearing 141 mounted inside it, the second rear bearing 141 is lubricated.

The connecting oil passage 530 is formed by sealing ribs 531 and extends from the front wall of the volute 110 to the rear wall of the volute 110. It is arranged suspended inside the cavity of the volute 110, and its two ends are connected to the first rear oil passage 510 respectively. , the second rear oil passage 520 is connected.

The sealing ribs 531 include a plurality of pieces extending from the front wall of the volute 110 to the rear wall of the volute 110. The plurality of sealing ribs 531 are connected to each other to form a sealed connecting oil passage 530. The lubricating oil flowing out of the first rear oil passage 510 can be transported to the second rear oil guide passage through the connecting oil passage 530 to lubricate the second rear bearing 141 .

Similarly, there is a matching gap between the second rear bearing 141 and the second rotating shaft 140. The second oil storage component 160 is arranged below the second rear bearing 141. During the high-speed rotation of the second rotating shaft 140, the second oil storage component 160 is located in a matching position between the second rear bearing 141 and the second rotating shaft 140. The lubricating oil in the gap will be thrown into the second oil storage component 160 below to realize the collection and return of lubricating oil.

In order to achieve lubrication of the first rear bearing 132, in some embodiments of the present disclosure, a second rear lubricating oil passage 300, a casing oil passage 310 and a first rear bearing seat are correspondingly arranged inside the centrifugal compressor. Oil passage.

The second rear lubricating oil passage 300 connects the first oil storage component 150 and the first rear bearing 132. The second rear lubricating oil passage 300 includes:

The casing oil channel is formed on the wall of the casing 100. The casing 100 flow channel extends from the first oil storage component 150 through the volute 110 and the front end cover 122 to the shell body 121, along the length direction of the shell body 121 Extends to one end of the shell body 121 away from the first oil storage component 150, and extends from the end of the shell body 121 to the first rear bearing seat 134 along the radial direction of the rear end cover 123;

A first rear bearing seat oil passage is formed in the first rear bearing seat 134 and butts with the casing oil passage to introduce lubricating oil into the first rear bearing 132 .

In some embodiments of the present disclosure, the casing oil passages include sequentially connected:

The first rear flow channel 311 is formed in the wall of the volute 110 or on the inner wall of the volute 110 and is connected to one side of the first oil storage component 150 .

The docking flow channel 312 is formed in the wall of the front end cover 122 , extends along the axial direction of the shell body 121 , and is connected with the first rear flow channel 311 .

The second rear flow channel 313 is formed on the wall of the housing body 121 , extends along the axial direction of the motor housing 120 , and is connected with the butt flow channel 312 .

The third rear flow passage 314 is formed in the rear end cover 123 and communicates with the first rear bearing seat oil passage.

The rear end cap 123 includes: an end cap body and an annular end cap protrusion formed by extending from one side of the end cap body and forming a conical vertical end cap body.

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

During molding, the first rear bearing seat 134 is directly integrally formed with the rear end cover 123 .

The third rear flow channel 314 includes: an end cover body flow channel 3141, which is arranged along the radial direction of the end cover body 1231.

The end cover raised flow channel 3142 is arranged in the end cover raised wall and includes: a first inclined flow channel 3143, a second inclined flow channel 3144 and a first rear bearing seat oil channel 3145.

The first inclined flow channel 3143 is arranged inclined downward along the radial direction of the end cover body 1231.

The second inclined flow channel 3144 is connected with the first inclined flow channel 3143, extends along the axis direction of the end cover protrusion, and is inclined toward the center side of the rear bearing seat installation cavity.

The first rear bearing seat oil passage 3145 is connected with the second inclined flow passage 3144 and is arranged along the radial direction of the annular end cover protrusion 1232.

In order to realize the oil return of the lubricating oil entering the first rear bearing 132, an oil return oil passage 320 is also provided inside the centrifugal compressor.

The oil return path 320 includes an oil inlet portion 321 provided at the bottom of the housing body 121. A motor cavity is formed in the housing body 121. The oil inlet portion 321 communicates with the motor cavity. The oil return path 320 is partially formed in the housing. The wall at the bottom of the body 121 is partially formed on the inner wall of the volute 110 and extends from the oil inlet 321 along the axis of the shell body 121 to the position of the second oil storage component 160 and communicates with the second oil storage component 160 .

When installed, the first rear bearing 132 is arranged in the shell body 121 and must be at a certain distance from the bottom of the shell body 121 , that is, 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, it will throw out the lubricating oil in the gap between the first rear bearing 132 and the first rotating shaft 130 , and the thrown out lubricating oil will fall into the space under the action of gravity. at the bottom of the shell body 121 .

In this embodiment, the oil inlet 321 connected to the motor cavity is provided at the bottom of the housing body 121 so that the lubricating oil can enter the oil inlet 321 and pass through the oil return path connected to the oil inlet 321 320 flows back into the second oil storage component 160 to realize oil return.

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

In some embodiments of the present disclosure, the oil return circuit 320 includes the following components. A casing oil return oil passage 322 is formed in the inner wall of the casing body 121 . The casing oil return oil passage 322 extends along the axial direction of the casing and is connected with the oil inlet 321 .

An end cover oil return passage 323 is formed on the front end cover 122, and the end cover oil return passage 323 is connected with the housing return oil passage 322.

The volute oil return oil passage 324 is formed in the wall of the volute 110 and communicates with the end cover oil return oil passage 323 and the second oil storage component 160. The volute case oil return oil passage 324 and the end cover oil return oil passage 323 is in line with the housing return oil path 322.

In other embodiments of the present disclosure, the casing oil return passage 322 is formed on the outer wall of the casing body 121 by providing raised ribs on the outer wall of the casing body 121 to cooperate with the casing body 121 to avoid damaging the casing body 121 . 121 Internal structure installation causes interference.

Since the oil return path 320 must pass through the machined mating surfaces of the motor's front end cover 122 and the volute 110 when returning, the machined surface is prone to poor sealing contact, leading to lubricating oil leakage problems. Therefore, the front end cover 122 An oil return sealing structure is provided on the volute 110 at the mating position between the end cover oil return oil path 323 and the volute oil return oil path 324 for sealing the oil path. The sealing structure seals the mating position of the oil path. , to achieve the effect of preventing lubricating oil leakage.

The oil return sealing structure includes:

An oil return protrusion 330 is provided around the volute oil return passage 324, and an oil return recess 340 is provided around the end cover oil return passage 323. The oil return protrusion 330 is inserted into the In the oil return recessed portion 340, a first oil return seal 350 is provided at the contact mating end surface of the oil return protruding portion 330 and the oil return recessed portion 340, surrounding the oil passage butt mating position.

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

A second oil return seal 360 is also provided at the contact mating surface of the front end cover 122 and the volute 110. In some embodiments of the present disclosure, the first/second oil return seal is a sealing ring. When set, An embedding groove can be provided on the end face of the volute 110 , and the sealing ring is assembled in the embedding groove and is squeezed between the volute 110 and the front end cover 122 .

By arranging a concave and convex fitting structure at the butt matching position of the oil passage and adding an oil return seal at the concave and convex fitting structure, the sealing effect of the oil passage at the machined contact surface is ensured.

A low-speed rear sealing structure 370 for sealing the oil circuit is provided on the front end cover 122 and the volute 110 around the butt-fitting position of the first rear flow channel 311 and the butt flow channel 312. The low-speed rear sealing structure 370 and the The oil return seal structure is the same and will not be described again here.

The sealing effect is improved by the second oil return seal 360 provided on the front end surface and the volute 110 .

In some embodiments of the present disclosure, a raised component 1211 is formed on the outer wall of the shell body 121. The raised component 1211 extends along the length direction of the shell body 121, and a hollow cavity is formed inside the raised component 1211. A closed second rear flow channel 313 is formed between the raised ribs and the outer wall of the shell body 121 .

By arranging the protruding component 1211 on the outer wall of the shell body 121 to cooperate with the outer wall of the shell body 121 to form the second rear flow channel 313, the passage for transporting lubricating oil can be prevented from being formed inside the shell body 121 to avoid This eliminates the problem of interference between the installation structure arranged on the inner wall of the housing body 121 and the installation structure installed in the motor housing 120 , thereby reducing the occupation of the internal space of the motor housing 120 .

In some embodiments of the present disclosure, the raised ribs are surrounded by a plurality of raised ribs, including: vertical ribs arranged perpendicularly to the outer wall of the shell body 121, and there are formed between the vertical ribs The accommodation space and the transverse ribs connected between the vertical ribs are cooperatively connected with the outer wall of the shell body 121 to form the closed second rear flow channel 313.

In other embodiments of the present disclosure, the raised ribs are directly formed U-shaped bent plates, which can be welded and fixed on the outer wall of the shell body 121 during connection.

In other embodiments of the present disclosure, the second rear flow channel 313 is formed in the wall of the shell body 121 , and the distance between the second low-speed flow channel and the outer surface of the shell body 121 is 2-3 mm.

On the premise that the wall thickness of the shell body 121 can meet the usage intensity, during installation, the second rear flow channel 313 can also be opened inside the wall of the shell body 121 to allow it to flow from the wall of the shell body 121 , which will also not interfere with the installation components and structures assembled inside the housing body 121 .

The second front lubricating oil passage 400 includes: connecting the first oil storage component 150 and the first front bearing 131;

The casing oil passage 410 is formed on the wall of the casing 100. The casing oil passage 410 extends from the first oil storage component 150 and extends from the volute 110 to the front end cover 122, extending along the radial direction of the front end cover 122 to The first front bearing seat 133;

The first front bearing seat oil passage is formed in the first front bearing seat 133 and butts with the housing oil passage 410 to introduce lubricating oil into the first front bearing 131 .

The housing oil passage 410 of the second front lubricating oil passage 400 includes a first front flow passage 411 and a second front flow passage 412 that are connected in sequence.

The first front flow channel 411 is connected to one side of the first oil storage component 150 and is laterally arranged in the wall of the volute 110;

The second front flow channel 412 is formed in the front end cover 122 , butts with the first front flow channel 411 and extends along its radial direction after being bent downward, and is arranged perpendicularly to the low-speed front bearing seat 133 .

The second front flow channel 412 includes a first bending section and a second bending section. The first bending section is butted with the first front flow channel 411 and is arranged transversely.

The second bending section is arranged perpendicularly to the first bending section and is arranged radially along the front end cover 122 .

By arranging the second front flow channel 412 vertically to the front bearing seat 133, the lubricating oil can quickly flow downward by gravity during lubrication to perform the lubrication operation.

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

In order to enhance the lubrication of the second rear bearing, in some embodiments of the present disclosure, an auxiliary lubricating oil passage is provided inside the centrifugal compressor.

During lubrication, the first oil storage component 150 is located at the uppermost part of the volute 110 of the compressor, and the lubricating oil in the first oil storage component 150 passes through the second front lubricating oil passage 400 under the action of gravity and oil pressure. The first front channel 411 flows into the second front channel 412, and then flows into the third front channel to lubricate the first front bearing 131. The lubricating oil that has lubricated the front bearing will continue to pass through and the first front channel. The auxiliary connecting oil passage 430 connected with lubricating oil flows into the oil passage of the second rear bearing seat 143 to lubricate the second rear bearing 141.

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

The second oil storage component 160 extends along the axial direction of the volute 110 and is located below the first front bearing 131 and the second rear bearing. It can at least be used to absorb the gap between the second rear bearing and the second rotating shaft 140. Lubricating oil everywhere.

A first front sealing structure 420 that cooperates with each other is formed on the front end cover 122 and the volute 110 corresponding to the butt matching positions of the first front flow channel 411 and the second front flow channel 412. The first front sealing structure 420 includes:

The first front protrusion 421 is located on the volute 110 around the first front flow channel 411;

The first front recessed portion 422 is located on the front end cover 122 of the second front flow channel 412 .

Wherein, the first front protruding part 421 is inserted into the first front recessed part 422, and a contact fitting end surface of the first front protruding part 421 and the first front recessed part 422 is provided with The first front seal 423 surrounds the oil circuit butt mating position.

In some embodiments, a first front protrusion 421 is provided on the front end cover 122 around the second front flow channel 412 , and a first front recess 422 is provided on the volute 110 around the first front flow channel 411 .

A second front seal 424 is also provided at the contact mating surface of the front end cover 122 and the volute 110. An embedding groove is provided on the end surface of the volute 110. The second front seal 424 is assembled in the embedding groove so that it protrudes into the embedding groove. Grooving arrangement, after assembly is completed, the second front seal 424 is pressed between the volute 110 and the front end cap 122 .

By arranging a concave-convex fitting structure at the butt-fitting position of the oil passage and adding a first seal at the concave-convex fitting structure, the sealing effect of the oil passage at the machined contact surface is ensured.

The sealing effect is improved by the second front seal 424 provided on the front end surface and the volute 110 .

In order to cool the lubricating oil that flows out from the second oil storage component 160 and is transported by the oil pump, and to ensure that the lubricating oil transported to the first oil storage component 150 is cooled lubricating oil, a cooling device is also provided in this embodiment. 800.

The oil pump needs to pump oil from the second oil storage part 160 at the bottom, and the oil temperature in the oil tank of the second oil storage part 160 at the bottom is too high, so it must be cooled before the lubricating oil can be lubricated for the next time.

The cooling device 800 is located in the casing 100 and is connected to the oil supply passage 900 of the first oil storage component 150 and the second oil storage component 160. A cooling channel through which lubricating oil can flow is formed in the cooling device 800.

The condenser 600 includes:

The first refrigerant branch 820 has a first injection part at its end. The first refrigerant branch 820 can pass through the wall of the casing 100 and inject refrigerant into the cooling channel to interact with the cooling flow. The lubricating oil in the channel undergoes heat exchange.

The cooling device 800 in this embodiment can be directly built into the casing 100 during installation, realizing the built-in cooling device 800 and effectively avoiding the external pipe interface connection of the cooling device 800 due to long-term operation. Leakage problems caused by changes in environmental factors.

In some embodiments, the chiller is in normal working condition, the oil pump starts to work, and the lubricating oil in the second oil storage component 160 is transported outward. The lubricating oil transported from the second oil storage component 160 has a relatively high temperature. When it is transported to the first oil storage component 150, it will flow through the cooling channel of the cooling device 800. At this time, the refrigerant flowing out from the first refrigerant branch pipe 820 of the condenser 600 will spray the refrigerant to the cooling channel through the first injection part, so that The refrigerant can exchange heat with the lubricating oil flowing through it. After heat exchange, the refrigerant absorbs the heat of the lubricating oil, lowering the temperature of the lubricating oil and realizing low-temperature cooling of the lubricating oil.

The cooling device 800 in this embodiment cools the lubricating oil by directly utilizing the existing refrigerant in the unit and the refrigerant sprayed from the condenser 600 to perform heat exchange, so that it does not require the use of external plate heat exchangers of related technologies. The device structure is cooled, reducing production and labor costs.

In some embodiments of the present disclosure, a stator and rotor assembly accommodating portion 170 for accommodating the motor stator and rotor assembly on the side away from the volute 110 and a cooling device accommodating portion 180 on the side close to the volute 110 are formed in the motor cavity. The cooling device 800 is arranged in the cooling device receiving portion 180 , and the length of the cooling device 800 is 1/4-1/3 of the length of the motor housing 120 .

During installation, the motor cavity can be formed into two parts, the stator and rotor assembly accommodating cavity part and the cooling device accommodating cavity part, and the cooling device 800 is arranged inside the cooling device accommodating cavity part close to the side of the volute 110, so that For setting and connecting internal oil circuits.

The stator and rotor assembly accommodating cavity portion is used to install and fix the stator and rotor assembly.

The cooling device 800 is arranged at the front end of the inner wall of the motor housing 120 and occupies a length of 30 to 450 mm of the motor housing 120, such as 228.6 mm.

In some embodiments of the present disclosure, the cooling device 800 includes a spiral coil arranged helically along the length direction of the motor housing 120 . The spiral coil is arranged to fit the inner wall of the motor housing 120 , and its inner diameter is smaller than the inner diameter of the motor housing 120 . , Spiral coiled pipe includes multiple spiral pipe segments connected in sequence, and the spacing between adjacent spiral pipe segments is equal or unequal.

The spiral coil can form a spiral cooling channel inside it. When the lubricating oil flows into the spiral cooling channel, it will spirally flow along the spiral channel, and the flow time will be longer, which is equivalent to increasing the flow of lubricating oil inside it. time, thereby extending the contact time with the refrigerant sprayed from the first refrigerant branch pipe 820, thereby improving the cooling effect of the lubricating oil.

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 diameter of the spiral coil is one of 500 to 600mm, such as 540mm; the inner diameter of the spiral coil is one of 15 to 30mm, such as 25.4mm, and the required length of the spiral coil is 3 to 30m One of them, for example 15m, the number of turns of the spiral coil is one of 2 to 15 turns, for example 9 turns. The spiral coil material is made of copper.

The use of oil cooling coils replaces the original external plate heat exchanger, reducing production and labor costs.

In some embodiments of the present disclosure, the cooling device 800 includes multiple bent pipe sections arranged in a wavy shape. The multiple bent pipe sections are connected in sequence, and the spacing between adjacent bent pipe sections is the same or different.

Arranging multiple bent pipe sections up and down in a wavy shape can also prolong the flow time of lubricating oil inside them and improve the cooling effect of lubricating oil.

In some embodiments of the present disclosure, in order to install and fix the cooling device 800, a mounting bracket is fixedly provided on the inner wall of the motor housing 120, and the cooling device 800 is clamped on the mounting bracket.

The installation bracket can directly adopt the existing bracket structure, and will not be described in detail here.

Alternatively, the cooling device 800 can be directly welded and fixed on the inner wall of the motor housing 120 .

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

The second refrigerant branch 830 has a second injection part at its end. The second refrigerant branch 830 can pass through the wall of the motor housing 120 and inject towards the stator and rotor of the motor cavity. Refrigerant to absorb heat from the stator and 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 to inject heat to the stator and rotor assembly to cool the stator and rotor assembly.

In some embodiments of the present disclosure, it also includes:

The refrigerant delivery pipe 840 is connected between the motor cavity and the evaporator 700 to deliver the refrigerant that has exchanged heat with the lubricating oil and the stator and rotor components to the interior of the evaporator 700 .

In order to realize the recycling of the sprayed refrigerant, a refrigerant delivery pipe 840 is connected between the motor cavity and the evaporator 700. The refrigerant sprayed to the cooling device 800 and the stator and rotor assembly will vaporize due to heat absorption, and the vaporized refrigerant will evaporate. The refrigerant can flow back into the evaporator 700 through the refrigerant delivery pipe 840 .

In some embodiments of the present disclosure, the motor housing 120 is provided with a first through portion arranged through the motor housing 120 , the first through portion corresponds to the position of the cooling device 800 , and the first refrigerant branch pipe 820 passes through the first penetration portion and faces the cooling device 800;

And a second penetration portion arranged through the motor housing 120, the second penetration portion corresponds to the position of the stator and rotor assembly, and the second refrigerant branch pipe 830 passes through the second penetration portion and is disposed toward the stator and rotor assembly.

The first through-hole is a first through-hole, and the second through-hole is a second through-hole. 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 supply the cooling device 800 and the stator and rotor components are sprayed with refrigerant.

In some embodiments of the present disclosure, the inner diameter of the first refrigerant branch 820 is one of 6-24 mm; the inner diameter of the second refrigerant branch 830 is one of 6-24 mm, and the refrigerant flow rate of the first refrigerant branch 820 is The refrigerant flow rate of the second refrigerant branch pipe 830 is 2-10L/min, such as 6L/min, and the refrigerant flow rate of the second refrigerant branch pipe 830 is 2-14L/min, such as 8L/min.

The chiller also includes an oil supply oil circuit 900 .

In order to make most of the oil supply oil path 900 connected between the first oil storage component 150 and the second oil storage component 160 realize the built-in oil path structure, and reduce the oil line pipe interface that may be caused by using an external oil path structure. In order to solve the problems of oil pipe damage and leakage caused by changes in climate factors such as environmental frosting, the structure of the oil supply oil circuit 900 is set up in this embodiment so that the main oil supply oil circuit 910 serves as the main oil supply. The oil section 911 is arranged inside the casing 100 to minimize possible leakage of lubricating oil caused by the external oil circuit.

In some embodiments of the present disclosure, the oil supply circuit 900 includes: a main oil supply circuit 910, connected between the first oil storage component 150 and the oil filter 192; used to filter the oil filtered by the oil filter 192. The final lubricating oil is transported to the first oil storage component 150 .

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

The main oil supply section 911 is formed in the wall of the casing 100 .

The connecting oil line 920 is connected between the oil pump and the oil filter 192 .

At the same time, in order to realize the connection of the oil circuit between the oil pump and the oil filter 192, a connecting oil circuit 920 is also provided. The connecting oil circuit 920 is generally relatively short in length and can only meet the function of transporting lubricating oil over a short distance.

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

The cooling device 800 can cool the lubricating oil in the second oil storage component 160 and then transport it to the inside of the first oil storage component 150 .

When this embodiment is set up, the main oil supply section 911 of the main oil supply oil channel 910 that mainly transports lubricating oil is built-in and formed inside the wall of the casing 100, effectively avoiding the external arrangement of the oil supply oil channel 900. The resulting oil pipeline damage and leakage problems arise.

In some embodiments of the present disclosure, the main oil supply section 911 is the entire main oil supply oil circuit 910, which is completely arranged inside the casing 100 when set up. In some embodiments, the main oil supply section 911 include:

The first main oil path 9111 is located below the cooling device 800 and is connected to the oil filter 192. It extends upward from the wall at the bottom of the volute 110 and then passes through the inner wall of the front end cover 122, the inner wall of the shell body 121 and the input port of the cooling device 800. docking;

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

The first volute 110 section is formed in the wall of the volute 110 and is formed by bending from the bottom and then extending outward;

The first front end cover 122 section is connected with the first volute 110 section, and the first shell body section 121 is connected with the first front end cover 122 section;

The second main oil path 9112 is connected to the output port of the cooling device 800, extends upward from the inner wall of the housing body 121, and is connected to the first oil storage component 150 through the inner wall of the front end cover 122 and the inner wall of the volute 110.

The second main oil passage 9112 includes: a second shell body section 121, a second front end cover section 122 and a second volute 110 section, and the three sections are connected in sequence.

In order to realize the internalization of the entire oil supply oil circuit 900, in some embodiments of the present disclosure, the oil pump is built into the second oil storage component 160, and the connecting oil circuit 920 is correspondingly built into the volute. 110, at this time, the connecting oil circuit 920 is also completely built into the volute 110, and all the oil supply circuits 900 are completely built-in, achieving a high degree of built-in centralization.

In some embodiments of the present disclosure, the oil pump is assembled on the outer wall of the volute 110 , and the connecting oil passage 920 is located outside the casing 100 .

That is, during installation, the shorter connecting oil line 920 can also be arranged outside, and the oil pump can also be placed outside to facilitate maintenance of the oil pump.

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 connects the oil filter 192 and the main oil supply section 911.

The main oil supply section 911 includes:

The third main oil passage 9113 is connected to the inlet of the cooling device 800 and is formed in the wall of the shell body 121 and extends upward from the wall of the shell body 121;

The fourth main oil passage 9114 is connected to the outlet of the cooling device 800 , extends upward and bends from the inner wall of the shell body 121 , and communicates with the first oil storage component 150 through the inner wall of the front end cover 122 and the inner wall of the volute 110 .

In some embodiments of the present disclosure, the fourth main oil passage 9114 includes: a fourth shell body 121 section formed in the shell body 121, a fourth end cover section formed in the front end cover 122; a fourth volute 110 section formed in In the volute 110, the three are connected and connected with each other.

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

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

The connecting oil section 912 is short in length and is mainly used for connecting. At the same time, the connecting oil line 920 is built into the volute 110, so that the connecting oil line 920 is built-in and avoids the need for the connecting oil line 920. Damage leakage occurs.

In some embodiments of the present disclosure, the connecting oil section 912 is provided outside the casing 100 and communicates with the third main oil passage 9113; the oil pump is assembled on the outer wall of the volute 110, and the connecting oil section Road 920 is located outside the casing 100 .

The connecting oil line 920 is placed externally, and the oil pump is placed externally, so that the oil pump can be easily replaced and repaired.

Moreover, although the connecting oil section 912 and the connecting oil passage 920 are external, the longer main oil supply section 911, which is mainly used for oil supply, is formed of a built-in structure, which still greatly reduces the number of oil supply passages 900. Completely external piping can easily lead to leakage and damage.

In order to enhance the sealing of the oil circuit, in some embodiments of the present disclosure, the circumference of the first main oil passage 9111, the circumference of the second main oil passage 9112 and the fourth main oil passage at the butt joint between the front end cover 122 and the volute 110 are The oil passage 9114 is equipped with an oil inlet sealing structure correspondingly on its circumference.

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

The oil inlet protrusion 931 is formed on one of the front end cover 122 or the volute 110;

The oil inlet recessed portion 932 is formed on the other of the front end cover 122 and the volute 110. The oil inlet protruding portion 931 is inserted into the oil inlet recessed portion 932. Between the oil inlet protruding portion 931 and A first oil inlet seal 933 is provided on the mating contact surface of the oil inlet recess 932 .

The first oil inlet seal 933 is a sealing ring. Through the concave and convex matching structure and the cooperation of the sealing ring, a double seal is achieved on the oil path at the butt joint between the front end cover 122 and the volute 110, which improves the sealing effect and avoids oil leakage. problems arise.

A second oil inlet seal 934 is also provided at the joint between the front end cover 122 and the volute 110 .

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 of the length of the main oil supply section 911 /30.

The above are only preferred embodiments of the present disclosure, and are not intended to limit the present disclosure in other forms. Any skilled person familiar with the art may make changes or modifications to equivalent changes using the technical contents disclosed above. Example. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present disclosure without departing from the content of the disclosed technical solution still fall within the protection scope of the disclosed technical solution.

Claims

A chiller including:

casing, including casing walls;

A compressor placed in the casing;

The first rotating shaft is located in the casing, and has a first front bearing and a first rear bearing at both ends;

The second rotating shaft is located in the casing and is equipped with a bearing assembly;

The chiller also includes:

The first oil storage component is arranged above the casing;

The second oil storage component is arranged in the casing and communicates with the first oil storage component through an oil supply oil path. The oil supply oil path includes a main oil supply section formed in the casing wall. The main oil supply oil line is equipped with a cooling device;

Bearing lubricating oil channel, which at least includes:

A first lubricating oil passage connects the first oil storage component and the bearing assembly, and is formed in the bearing seat corresponding to the casing wall and the bearing assembly;

A second rear lubricating oil passage is formed on the casing wall and the seat of the first rear bearing, connecting the first oil storage component and the first rear bearing:

A second front lubricating oil passage is formed on the casing wall and the seat of the first front bearing, connecting the first oil storage component and the first front bearing;

The oil flowing out of the second oil storage component enters the first oil storage component through the cooling device, and the oil in the first oil storage component passes through the first lubricating oil path and the second rear lubricating oil path in sequence. and the second front lubricating oil passage respectively enter the bearing assembly, the first rear bearing, and the first front bearing to lubricate them.
The chiller of claim 1, wherein the casing includes a volute and a motor casing, the motor casing includes a casing body, a front end cover and a rear end cover, and the bearing assembly includes a second rotary shaft disposed at both ends of the second rotating shaft. The front bearing and the second rear bearing, the bearing seat includes the second front bearing seat and the second rear bearing seat, and the first lubricating oil circuit includes:

The first high-speed shaft lubricating oil channel connects the second front bearing and the first oil storage component, and is connected by the first high-speed closed flow channel formed on the inner wall of the volute and the second high-speed closed flow channel on the second front bearing seat. formed, with its vertical second front bearing arrangement;

A second high-speed shaft lubricating oil channel is connected to the first high-speed shaft lubricating oil channel and the second rear bearing respectively.
The chiller according to claim 2, wherein the second rotating shaft lubricating oil channel includes:

The first rear oil passage is formed on the front wall of the volute and is formed by extending downward from the first oil storage component;

The second rear oil passage is formed in the second rear bearing seat;

The connecting oil passage is formed by sealing ribs, extends from the front wall of the volute to the rear wall of the volute, is connected between the front wall of the volute and the second rear bearing seat, and is connected with the first rear oil passage and the second rear bearing seat. The rear oil passage is connected.
The chiller according to claim 1, wherein the casing includes a volute and a motor casing, the motor casing includes a casing body, a front end cover and a rear end cover, and the low-speed rear lubricating oil circuit includes:

The casing oil channel is formed on the casing wall. The casing flow channel extends from the first oil storage component to the casing body, extends along the length direction of the casing body to an end of the casing body away from the first oil storage component, and Extend from the end of the shell body to the first rear bearing seat along the radial direction of the rear end cover;

A first rear bearing seat oil passage is formed in the first rear bearing seat and butts with the casing oil passage to introduce lubricating oil into the first rear bearing.
The chiller according to claim 4, wherein the chiller further includes:

The oil return path includes an oil inlet portion provided at the bottom of the housing body. A motor cavity is formed in the motor housing. The oil inlet portion is connected to the motor cavity. The oil return path portion forms In the wall at the bottom of the shell body, a portion is formed on the inner wall of the volute, extending from the oil inlet portion along the axis of the shell body to the position of the second oil storage component and communicating with the second oil storage component.
The chiller according to claim 1, wherein the casing includes a volute and a motor casing, the motor casing includes a casing body, a front end cover and a rear end cover, and the first front lubricating oil circuit includes:

The first front flow channel is formed in the volute wall;

The second front flow channel is formed in the front end cover and extends along its radial direction;

The third front flow channel is formed in the first front bearing seat.
The chiller according to claim 1, wherein the chiller further includes:

A cooling device, located in the casing and connected to the oil supply oil path, has a cooling channel inside which the lubricating oil can flow;

Condenser includes:

A first refrigerant branch, the end of the first refrigerant branch has a first injection part, the first refrigerant branch can inject refrigerant through the casing wall to the cooling channel to interact with the lubricating oil flowing through the cooling channel. heat exchange.
The chiller according to claim 1, wherein the oil supply oil circuit includes:

The main oil supply circuit is connected between the first oil storage component and the oil filter; including:

The main oil supply section is formed in the casing wall;

Connect the oil line between the oil pump and the oil filter;

The cooling device is connected to the main oil supply section and used to cool the lubricating oil on the main oil supply section.
The chiller according to claim 8, wherein the main oil supply section includes:

The first main oil circuit is located below the cooling device, connected to the oil filter, extends upward from the wall at the bottom of the volute, and then passes through the inner wall of the front end cover and the inner wall of the shell body to connect with the input port of the cooling device;

The second main oil circuit is connected to the output port of the cooling device, extends upward from the inner wall of the housing body, is bent, and then communicates with the first oil storage component through the inner wall of the front end cover and the inner wall of the volute.
The chiller according to claim 8, wherein the main oil supply section includes:

The third main oil circuit is connected to the inlet of the cooling device and is formed in the motor shell wall and extends upward from the motor shell wall;

The fourth main oil path is connected to the outlet of the cooling device, extends upward from the inner wall of the housing body, is bent, and communicates with the first oil storage component through the inner wall of the front end cover and the inner wall of the volute.