CN111946621A

CN111946621A - Oil supply mechanism of variable frequency compressor

Info

Publication number: CN111946621A
Application number: CN202010960883.6A
Authority: CN
Inventors: 姜坤; 闫伟国; 郎贤明; 傅国英; 王子豪
Original assignee: Panasonic Appliances Compressor Dalian Co Ltd
Current assignee: Panasonic Appliances Compressor Dalian Co Ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2020-11-17

Abstract

The invention discloses an oil supply mechanism of a variable frequency compressor, relates to the technical field of variable frequency compressors, and particularly relates to an oil supply structure between a crankshaft of the compressor and a dry friction bearing. The lower support of the invention is fixedly arranged in the lower part of the shell of the compressor and is used for axially restricting the crankshaft of the compressor; a crankshaft main oil way is processed at the axis of the crankshaft; at least one group of oil supply mechanisms are arranged on the crankshaft; the crankshaft is arranged in a shaft hole of the lower support through a dry friction bearing; the oil suction pipe assembly is arranged at the bottom of the crankshaft and is communicated with a crankshaft main oil way in the crankshaft; the gear displacement pump inner rotor and the gear displacement pump outer rotor form a gear displacement pump which is arranged at the lower part of the crankshaft; the outer rotor of the gear displacement pump is fixed, the inner rotor of the gear displacement pump rotates along with the crankshaft, and lubricating oil is pumped into a main oil circuit of the crankshaft from an oil pool through an oil suction pipe assembly. The technical scheme of the invention solves the problems that the oil hole of the existing variable frequency compressor in the prior art has small design space, and the oil supply amount is overlarge at low rotating speed and insufficient at high rotating speed.

Description

Oil supply mechanism of variable frequency compressor

Technical Field

The invention discloses an oil supply mechanism of a variable frequency compressor, relates to the technical field of variable frequency compressors, and particularly relates to an oil supply structure between a crankshaft of the compressor and a dry friction bearing.

Background

The existing frequency conversion compressor mainly drives a crankshaft to drive a scroll plate to operate through a motor, a main shaft bearing selects a dry friction bearing more, and a deep groove ball bearing is also selected as part of a large-displacement scroll type constant speed compressor. The main shaft bearing of the vortex type variable frequency compressor adopts dry friction bearings, and the three positions are respectively positioned at the lower support position, the upper support position and the movable vortex position. The main shaft and the bearing need to be fully lubricated to ensure the reliability and the working efficiency of the compressor during normal operation.

In order to fully lubricate the main shaft and the bearing, the existing compressor adopts an oil supply mode of the main shaft side oil hole, and the structure solves the problem of lubrication between the main shaft and the bearing to a certain extent.

The defects of the prior structure technology are as follows: aiming at the variable frequency compressor, the diameter and the height of a main shaft oil hole are fixed, the oil supply quantity is only related to the rotating speed, the oil hole design space is small for ensuring the working efficiency when the variable frequency compressor operates at the common rotating speed, and the problems of overlarge oil supply quantity at the low rotating speed and insufficient oil supply at the high rotating speed exist, and the problem cannot be effectively solved.

In view of the problems in the prior art, a novel oil supply mechanism of the inverter compressor is researched and designed, so that the problem in the prior art is very necessary to be solved.

Disclosure of Invention

According to the technical problems that the oil hole of the existing variable frequency compressor provided by the prior art is small in design space, the oil supply amount is overlarge in the low rotating speed and the oil supply is insufficient in the high rotating speed, and the oil supply mechanism of the variable frequency compressor is provided. The invention mainly utilizes the oil supply mechanism additionally arranged on the crankshaft to lubricate the dry friction bearing and the main shaft, thereby achieving the purpose of supplying different oil quantities according to different rotating speeds.

The technical means adopted by the invention are as follows:

an inverter compressor oil supply mechanism includes: the oil suction device comprises a crankshaft, an inner rotor of the gear displacement pump, an oil suction pipe assembly, a lower support, an outer rotor of the gear displacement pump, a dry friction bearing and an oil supply mechanism;

further, the lower support is fixedly arranged in the lower part of the shell of the compressor and used for axially restraining the crankshaft of the compressor;

further, a crankshaft main oil way is machined in the axis of the crankshaft; at least one group of oil supply mechanisms are arranged on the crankshaft; the crankshaft is arranged in a shaft hole of the lower support through a dry friction bearing;

furthermore, the oil suction pipe assembly is arranged at the bottom of the crankshaft and is communicated with a main oil way of the crankshaft in the crankshaft;

furthermore, an inner rotor of the gear displacement pump and an outer rotor of the gear displacement pump form the gear displacement pump which is arranged at the lower part of the crankshaft; the outer rotor of the gear displacement pump is fixed, the inner rotor of the gear displacement pump rotates along with the crankshaft, and lubricating oil is pumped into a main oil circuit of the crankshaft from an oil pool through an oil suction pipe assembly.

Further, the oil supply mechanism includes: the oil discharge pin, the spring and the crankshaft auxiliary oil way are arranged;

furthermore, the crankshaft auxiliary oil way is radially arranged on the crankshaft and communicated with the crankshaft main oil way;

furthermore, the spring is arranged in the auxiliary oil way of the crankshaft, and one end of the spring is fixed at the outer end in the auxiliary oil way of the crankshaft;

furthermore, the oil discharge pin is arranged in the auxiliary oil way of the crankshaft in a floating mode and is positioned on the inner side of the spring.

Furthermore, the oil supply mechanism is applied to the lower support and the upper support, and the mass of the unloading pin and the stiffness coefficient of the spring are adjusted to control the oil supply amount of the crankshaft auxiliary oil way according to the actual application requirements and the specific characteristics of the dry friction bearing.

Furthermore, the oil supply mechanism is applied to a non-oil supply path which is not in contact with the dry friction bearing and is used for reducing the oil supply amount of the upper support part, so that the condition that the compressor is lack of oil or the oil output amount is large due to the fact that excessive backflow of lubricating oil is carried away from the compressor body by air flow is avoided.

Furthermore, the crankshaft auxiliary oil way and the oil discharge pin are matched with each other to control the flow area of oil, so that the flow of the oil is controlled, the side surface of the oil discharge pin can adopt a pyramid or a cone, and the reducing part of the crankshaft auxiliary oil way is correspondingly made into a pyramid hole or a cone hole to be matched with the oil discharge pin, so that the oil supply sensitivity and the installation performance at various rotating speeds are improved.

Furthermore, the fixing mode of the spring in the crankshaft can be realized through the fixing constraint of a spring cover plate with holes and screws, and can also be realized through the matching of pin shafts with holes and the like.

Further, when the rotation speed of the compressor fluctuates, the oil supply amount in the auxiliary oil passage of the crankshaft fluctuates in two ways: a) when the rotating speed of the compressor is increased, the angular speed of the crankshaft is increased, the oil discharging pin moves towards the direction deviating from the main oil way of the crankshaft under the action of centrifugal force to compress the spring, the gap between the oil discharging pin and the auxiliary oil way of the crankshaft is enlarged, and the flow area of lubricating oil is increased, so that the oil flow between the crankshaft and the dry friction bearing is increased, and the relatively high lubricating requirement of the dry friction bearing when the compressor operates at a high rotating speed is met; b) when the rotating speed of the compressor is reduced, the angular speed of the crankshaft is reduced, the unloading pin moves towards the direction approaching to the main oil way of the crankshaft under the action of centrifugal force and a spring, the gap between the unloading pin and the auxiliary oil way of the crankshaft is reduced, and the flow area of lubricating oil is reduced, so that the oil flow between the crankshaft and the dry friction bearing is reduced, and the requirement of relatively low lubrication of the dry friction bearing when the compressor operates at a low rotating speed is met.

Compared with the prior art, the invention has the following advantages:

1. according to the oil supply mechanism of the variable frequency compressor, the oil supply amount of the dry friction bearing is nonlinearly related to the rotating speed of the crankshaft by arranging the oil supply mechanism, so that the problems that the dry friction bearing of the compressor is too large in oil supply at a low rotating speed and insufficient in oil supply at a high rotating speed are effectively solved;

2. according to the oil supply mechanism of the variable frequency compressor, the problem of overlarge oil output of the compressor is solved to a certain extent by arranging the oil supply mechanism, and the probability of final failure of the compressor due to lack of lubricating oil caused by high-speed operation is effectively reduced;

3. the oil supply mechanism of the variable frequency compressor provided by the invention has the advantages of low design cost and wide application range, and is generally suitable for the current down-conversion compressor.

In conclusion, the technical scheme of the invention solves the problems that the oil hole of the existing variable frequency compressor in the prior art has small design space, the oil supply amount is overlarge at low rotating speed and the oil supply is insufficient at high rotating speed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of section A of FIG. 1;

FIG. 3 is an enlarged view of section B of FIG. 2;

FIG. 4 is a schematic diagram of a spring assembly using a spring cover plate and screws;

FIG. 5 is a structural diagram of the present invention in which the oil supply mechanism is only disposed at the lower support;

FIG. 6 is a schematic view of the common structure of the present invention for the portion not in contact with the dry friction bearing.

In the figure: 1. the device comprises a screw 2, a spring cover plate 3, an oil unloading pin 4, a spring 5, a crankshaft 6, an inner rotor 7 of the gear displacement pump, an oil suction pipe assembly 8, an oil pool 9, a lower support 10, an outer rotor 11 of the gear displacement pump, a dry friction bearing 12, an upper support 13, a crankshaft auxiliary oil way 14 and a crankshaft main oil way.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1 to 4, the present invention provides an oil supply mechanism of an inverter compressor, including: the device comprises a crankshaft 5, an inner rotor 6 of the gear displacement pump, an oil suction pipe assembly 7, a lower support 9, an outer rotor 10 of the gear displacement pump, a dry friction bearing 11 and an oil supply mechanism; the lower support 9 is fixedly arranged in the lower part of the shell of the compressor and is used for axially restraining the crankshaft of the compressor; a crankshaft main oil way 14 is processed at the axis of the crankshaft 5; at least one group of oil supply mechanisms are arranged on the crankshaft 5; the crankshaft 5 is arranged in a shaft hole of the lower support 9 through a dry friction bearing 11; the oil suction pipe assembly 7 is arranged at the bottom of the crankshaft 5 and is communicated with a crankshaft main oil way 14 in the crankshaft 5; the gear displacement pump inner rotor 6 and the gear displacement pump outer rotor 10 form a gear displacement pump and are arranged at the lower part of the crankshaft 5; the external rotor 10 of the gear displacement pump is fixed, the internal rotor 6 of the gear displacement pump rotates along with the crankshaft 5, and lubricating oil is pumped from the oil pool 8 to the main oil path 14 of the crankshaft through the oil suction pipe assembly 7.

The oil supply mechanism includes: the oil discharging pin 3, the spring 4 and the crankshaft auxiliary oil way 13; the crankshaft auxiliary oil way 13 is radially arranged on the crankshaft 5 and is communicated with the crankshaft main oil way 14; the spring 4 is arranged in the crankshaft auxiliary oil way 13, and one end of the spring is fixed at the outer end in the crankshaft auxiliary oil way 13; the oil discharge pin 3 is arranged in the auxiliary crankshaft oil way 13 in a floating mode and is positioned on the inner side of the spring 4.

The oil supply mechanism is applied to the lower support 9 and the upper support 12, and the mass of the unloading pin 3 and the stiffness coefficient of the spring 4 are adjusted to control the oil supply amount of the crankshaft auxiliary oil circuit 13 according to the actual application requirements and the specific characteristics of the dry friction bearing 11.

The oil supply mechanism is applied to a non-oil supply path which is not in contact with the dry friction bearing 11 and is used for reducing the oil supply amount at the upper support 12, so that the condition that the lubricating oil is excessively refluxed and is carried away from the compressor body by air flow to cause oil shortage or large oil output of the compressor is avoided.

The crankshaft auxiliary oil way 13 and the oil discharging pin 3 are matched with each other to control the flow area of oil, so that the flow of the oil is controlled, the side surface of the oil discharging pin 3 can adopt a pyramid or a cone, and the reducing part of the crankshaft auxiliary oil way 13 is correspondingly made into a pyramid hole or a cone hole to be matched with the oil discharging pin 3, so that the oil supply sensitivity and the installation performance at various rotating speeds are improved.

The fixing mode of the spring 4 in the crankshaft 5 can be realized by the fixing constraint of the spring cover plate 2 with holes and the screw 1, and can also be realized by the matching of pin shafts with holes and the like.

When the rotation speed of the compressor fluctuates, the oil supply amount in the auxiliary crankshaft oil passage 13 fluctuates in two ways: a, when the rotating speed of the compressor is increased, the angular speed of the crankshaft 5 is increased, the oil discharging pin 3 moves towards the direction deviating from the main oil way 14 of the crankshaft under the action of centrifugal force to compress the spring 4, the gap between the oil discharging pin 3 and the auxiliary oil way 13 of the crankshaft is enlarged, and the flow area of lubricating oil is increased, so that the oil flow between the crankshaft 5 and the dry friction bearing 11 is increased, and the relatively high lubricating requirement of the dry friction bearing 11 when the compressor operates at a high rotating speed is met; b, when the rotating speed of the compressor is reduced, the angular speed of the crankshaft 5 is reduced, the unloading pin 3 moves towards the direction approaching to the crankshaft main oil way 14 under the action of centrifugal force and the spring 4, the gap between the unloading pin 3 and the crankshaft auxiliary oil way 13 is reduced, and the flow area of lubricating oil is reduced, so that the oil flow between the crankshaft 5 and the dry friction bearing 11 is reduced, and the relatively low lubricating requirement of the dry friction bearing 11 when the compressor operates at a low rotating speed is met.

Example 1

As shown in fig. 1-3, the present invention provides an oil supply mechanism for a variable frequency compressor, which is disposed at the junction of a crankshaft 5 and an upper support 12 and a lower support 9, and can supply oil controllably through a dry friction bearing 11 in the upper support 12 and the lower support 9, thereby improving the lubrication condition.

Example 2

As shown in fig. 2, 3 and 5, (on the basis of embodiment 1) the invention also provides an oil supply mechanism of the variable frequency compressor, wherein the oil supply mechanism is only arranged at the joint of the crankshaft 5 and the lower support 9, and oil can be controllably supplied to the dry friction bearing 11 in the lower support 9, so that the lubrication condition is improved.

Example 3

As shown in fig. 1, (on the basis of embodiment 1), the present invention further provides an oil supply mechanism for an inverter compressor, which can be used in a single part not contacting with the dry friction bearing 11, and by reducing the flow rate of the lubricating oil in the main crankshaft oil path 14, the oil supply rate of the auxiliary crankshaft oil path 13 at the upper support 12 is reduced, thereby reducing the chance of contact between the lubricating oil and the air flow, reducing the oil discharge of the compressor, and reducing the probability of the final failure of the compressor due to lack of the lubricating oil caused by high-speed operation.

Example 4

As shown in fig. 4, (on the basis of embodiment 1), the invention also provides an oil supply mechanism of the inverter compressor, wherein an oil discharge pin 3 and a spring 4 of the oil supply mechanism can be packaged in a crankshaft auxiliary oil circuit 13 in a combined mode of a screw 1 and a spring cover plate 2.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an inverter compressor oil supply mechanism, its characterized in that, inverter compressor oil supply mechanism include: the oil pump comprises a crankshaft (5), a gear displacement pump inner rotor (6), an oil suction pipe assembly (7), a lower support (9), a gear displacement pump outer rotor (10), a dry friction bearing (11) and an oil supply mechanism;

the lower support (9) is fixedly arranged in the lower part of the shell of the compressor and is used for axially restraining the crankshaft of the compressor;

a main crankshaft oil way (14) is machined in the axis of the crankshaft (5); at least one group of oil supply mechanisms are arranged on the crankshaft (5); the crankshaft (5) is arranged in a shaft hole of the lower support (9) through a dry friction bearing (11);

the oil suction pipe component (7) is arranged at the bottom of the crankshaft (5) and is communicated with a crankshaft main oil way (14) in the crankshaft (5);

the gear displacement pump inner rotor (6) and the gear displacement pump outer rotor (10) form a gear displacement pump and are arranged at the lower part of the crankshaft (5); an outer rotor (10) of the gear displacement pump is fixed, an inner rotor (6) of the gear displacement pump rotates along with a crankshaft (5), and lubricating oil is pumped into a main oil path (14) of the crankshaft from an oil pool (8) through an oil suction pipe assembly (7).

2. The inverter compressor oil supply mechanism according to claim 1, wherein the oil supply mechanism comprises: the oil discharging pin (3), the spring (4) and the crankshaft auxiliary oil way (13);

the auxiliary crankshaft oil way (13) is radially arranged on the crankshaft (5) and is communicated with the main crankshaft oil way (14);

the spring (4) is arranged in the auxiliary crankshaft oil way (13), and one end of the spring is fixed at the outer end in the auxiliary crankshaft oil way (13);

the oil unloading pin (3) is arranged in the auxiliary oil way (13) of the crankshaft in a floating way and is positioned on the inner side of the spring (4).

3. The oil supply mechanism of the inverter compressor of claim 2, wherein the oil supply mechanism is applied to the lower support (9) and the upper support (12), and the mass of the unloading pin (3) and the stiffness coefficient of the spring (4) are adjusted to control the oil supply amount of the crankshaft auxiliary oil circuit (13) according to the actual application requirements and the specific characteristics of the dry friction bearing (11).

4. The oil supply mechanism of the inverter compressor according to claim 3, wherein the oil supply mechanism is applied to a non-oil supply path which is not in contact with the dry friction bearing (11) and is used for reducing the oil supply amount at the upper support (12), so as to avoid the situation that the lubricating oil is excessively refluxed and carried away from the compressor body by the air flow to cause oil shortage or oil discharge of the compressor.

5. The oil supply mechanism of the inverter compressor according to claim 3, wherein the crankshaft auxiliary oil circuit (13) and the oil discharge pin (3) are matched with each other to control the oil flow area and further control the oil flow rate, the side surface of the oil discharge pin (3) can adopt a pyramid or a cone, the reducing part of the crankshaft auxiliary oil circuit (13) is correspondingly made into a pyramid hole or a cone hole to be matched with the oil discharge pin (3), and the oil supply sensitivity and the installation performance at various rotating speeds are improved.

6. Oil supply mechanism for inverter compressor according to claim 3, characterized in that the fixation of the spring (4) in the crankshaft (5) can be realized by the fixation constraint of the perforated spring cover plate (2) and the screw (1), or by the perforated pin fitting.

7. The oil supply mechanism of the inverter compressor as claimed in claim 2, wherein when the rotation speed of the compressor varies, the oil supply amount in the auxiliary oil passage (13) of the crankshaft varies in two ways: a) when the rotating speed of the compressor is increased, the angular speed of the crankshaft (5) is increased, the oil discharging pin (3) moves towards the direction deviating from the main oil way (14) of the crankshaft under the action of centrifugal force to compress the spring (4), the gap between the oil discharging pin (3) and the auxiliary oil way (13) of the crankshaft is enlarged, and the flow area of lubricating oil is increased, so that the oil flow between the crankshaft (5) and the dry friction bearing (11) is increased, and the relatively high lubricating requirement of the dry friction bearing (11) when the compressor operates at a high rotating speed is met; b) when the rotating speed of the compressor is reduced, the angular speed of the crankshaft (5) is reduced, the unloading pin (3) moves towards the direction approaching to the main crankshaft oil way (14) under the action of centrifugal force and the spring (4), the gap between the unloading pin (3) and the auxiliary crankshaft oil way (13) is reduced, and the flow area of lubricating oil is reduced, so that the oil flow between the crankshaft (5) and the dry friction bearing (11) is reduced, and the relatively low lubricating requirement of the dry friction bearing (11) when the compressor operates at a low rotating speed is met.