Oil return control mechanism and compressor

Abstract

The present invention discloses an oil return control mechanism and a compressor, which relates to the technical field of compressors, and solves the problem that the oil return structure in the prior art cannot well control the amount of oil stored in the compressor when the compressor is running at high speed. The regulating valve and the elastic member of the oil return control mechanism are located in a receiving portion and can move along the axial direction of the receiving portion based on the speed of the compressor, and the regulating valve and the elastic member have a first state of closing the oil return channel and a second state of opening the oil return channel; when the regulating valve and the elastic member are in the first state, the lubricating oil is recovered to the oil pool through the channel assembly; when the regulating valve and the elastic member are in the second state, the lubricating oil is recovered to the oil pool through the oil return channel or the oil return channel and the channel assembly. When the compressor is running at a low speed, the lubricating oil is recovered to the oil pool through the channel assembly, and when the compressor is running at a high speed, the lubricating oil is recovered to the oil pool through the oil return channel or the oil return channel and the channel assembly, thereby improving the reliability of the compressor operation at the same speed.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an oil return control mechanism and a compressor comprising the oil return control mechanism. Background Art

[0002] Scroll compressors are widely used in the fields of air conditioning and heat pumps, and mainly include parts such as a housing, a compression mechanism, a support mechanism, a driving mechanism, a working fluid suction pipe, and a working fluid discharge pipe. Among them, the compression mechanism includes a movable scroll component and a fixed scroll component; the driving mechanism includes a stator assembly, a crankshaft, and a rotor assembly. The crankshaft drives the movable scroll component, and since the movable scroll component is provided with an anti-rotation mechanism, the movable scroll component can make a translational rotation relative to the fixed scroll component. The volume of the compression chamber defined by the spiral vortex of the fixed scroll component and the spiral vortex of the movable scroll component gradually decreases, and the refrigerant pressure in the chamber continues to increase, so that the refrigerant sucked into the compression chamber through the working fluid suction pipe is compressed and finally discharged from the exhaust port at the center of the scroll component, and discharged from the compressor from the working fluid discharge pipe, and the working fluid of the compressor is discharged to the external refrigeration cycle. In this way, the working cycle process of refrigerant suction, compression, and discharge is realized.

[0003] In a scroll compressor, the oil circuit system plays an important role in its performance. Usually, the bottom of the compressor housing is set as a lubricating oil storage structure, and a lubricating oil pump is set near the lower end of the rotating shaft of the drive motor. The lubricating oil pump draws lubricating oil through the rotation of the rotating shaft and supplies it to various lubricating parts to lubricate the compression mechanism and bearings. During operation, the lubricating oil enters the compression mechanism, and the small gap between the fixed scroll and the orbiting scroll needs to be sealed to prevent fluid leakage and avoid reducing the operating efficiency of the compressor.

[0004] In existing scroll compressors, lubricating oil will enter the refrigeration cycle system along with the refrigerant through the compression mechanism, resulting in reduced refrigeration efficiency. Usually, an oil return structure is provided at the compressor support mechanism to recover part of the lubricating oil to the oil pool at the bottom of the shell. However, the existing oil return structure only provides a simple oil return channel at the compression mechanism or the support mechanism, the size of the oil return hole is fixed, and the oil return volume is limited. Generally, when the speed increases to more than 5400r / min, that is, when the compressor operating frequency is above 90Hz, the oil storage volume in the compressor cannot be well controlled, which can easily cause liquid hammer and damage to the pump body assembly.

[0005] Specifically, as the speed increases, the oil supply of the oil pump rises while the oil return volume of the existing oil return structure remains unchanged, which will cause the lubricating oil in the casing to accumulate in the oil storage part of the supporting mechanism, reducing the amount of oil at the bottom of the compressor casing and causing insufficient lubrication between mating parts, which can easily lead to increased temperatures in mating parts such as bearings, increased friction, and even consequences such as burning and wear; at the same time, too much oil in the oil storage part of the supporting mechanism can easily lead to excessive oil entering the compression chamber, which will seriously affect the performance and reliability of the compressor.

[0006] In order to solve the problem of insufficient oil at the bottom of the compressor and excessive oil in the supporting mechanism when the compressor is running at high speed, there are many solutions in the prior art. For example, in patent number CN107709784B, a flow adjustment mechanism is set to adjust the flow of oil discharged from the oil discharge channel. However, this method requires opening an oil return pipeline outside the compressor and installing a control device. The control device needs to monitor the lubricating oil temperature or refrigerant pressure, and the structure is complex and the manufacturing cost is too high. Summary of the invention

[0007] One of the purposes of the present invention is to provide an oil return control mechanism and a compressor, which solves the technical problem that the oil return structure in the prior art cannot well control the amount of oil stored in the compressor when the compressor is running at high speed. The many technical effects that can be produced by the preferred technical solution of the present invention are described in detail below.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The oil return control mechanism of the present invention comprises a housing portion, a regulating valve and an elastic member, wherein a channel assembly is provided on the regulating valve, and the channel assembly is connected to the oil return channel on the upper support mechanism; the regulating valve and the elastic member are located in the housing portion and can move along the axial direction of the housing portion based on the compressor speed, and enable the regulating valve and the elastic member to have a first state of closing the oil return channel and a second state of opening the oil return channel; and when the regulating valve and the elastic member are in the first state, the lubricating oil in the oil storage portion of the support mechanism is recovered to the oil pool through the channel assembly; when the regulating valve and the elastic member are in the second state, the lubricating oil in the oil storage portion of the support mechanism is recovered to the oil pool through the oil return channel, or the lubricating oil in the oil storage portion of the support mechanism is recovered to the oil pool through the oil return channel and the channel assembly.

[0010] According to a preferred embodiment, when the compressor speed is lower than a first critical speed, the buoyancy of the lubricating oil in the housing portion on the regulating valve is smaller than the elastic force of the elastic member on the regulating valve, and the regulating valve and the elastic member are in a first state of closing the oil return passage; when the compressor speed is higher than the first critical speed, the buoyancy of the lubricating oil in the housing portion on the regulating valve is greater than the elastic force of the elastic member on the regulating valve, and the regulating valve and the elastic member are in a second state of opening the oil return passage, and the opening degree of the regulating valve is proportional to the compressor speed.

[0011] According to a preferred embodiment, the elastic member is located above the regulating valve, and the difference between the initial length of the elastic member and the length of the elastic member when it is in an ultimate compression state is not less than the height of the regulating valve.

[0012] According to a preferred embodiment, the channel assembly includes a connecting hole and a first connecting groove, wherein at least two of the connecting holes opened along different angular directions are connected to the oil return channel on the upper support mechanism; the first connecting groove is connected to the connecting hole and passes through the valve end face axially.

[0013] According to a preferred embodiment, the channel assembly includes an annular groove and a second connecting groove, wherein the annular groove located in the circumferential direction of the regulating valve is connected to the return oil channel on the upper support mechanism; the second connecting groove is connected to the annular groove and passes through the valve end face axially.

[0014] According to a preferred embodiment, the distance from the valve end face to the bottom of the regulating valve is not less than the diameter of the oil return channel; the cross-sectional area of ​​the regulating valve is equal to the cross-sectional area of ​​the oil return channel, and the cross-sectional area of ​​the connecting hole or the annular groove is smaller than the cross-sectional area of ​​the oil return channel.

[0015] According to a preferred embodiment, the receiving portion is vertically arranged in the upper supporting mechanism, and the oil return control mechanism further includes a sealing pin, and the sealing pin is arranged above the elastic member.

[0016] According to a preferred embodiment, the receiving portion is located on the upper support mechanism and the cover plate, and the oil return control mechanism further includes an O-ring, which is located circumferentially outside the receiving portion and between the upper support mechanism and the cover plate.

[0017] According to a preferred embodiment, the receiving portion is obliquely arranged in the upper support mechanism, one end of the receiving portion is connected to the oil return channel, and the other end passes through the side wall of the upper support mechanism, and the oil return control mechanism also includes a pressure block, which is located in the receiving portion and above the elastic member.

[0018] The compressor of the present invention comprises the oil return control mechanism and the upper support mechanism described in any technical solution of the present invention, and the oil return control mechanism is arranged on the upper support mechanism.

[0019] The oil return control mechanism and compressor provided by the present invention have at least the following beneficial technical effects:

[0020] The oil return control mechanism of the present invention is as follows: when the compressor is running at a low speed, the amount of oil in the oil storage part of the support mechanism is small, the oil level is low, and the buoyancy of the regulating valve is smaller than the elastic force of the elastic member on the regulating valve. At this time, the regulating valve does not move, and the regulating valve and the elastic member are in a first state of closing the oil return channel. The lubricating oil in the oil storage part of the support mechanism is recovered to the oil pool at the bottom of the compressor through the channel assembly, and a proper amount of oil is stored in the oil storage part of the support mechanism to ensure the lubrication of various components of the pump body; when the speed of the compressor increases, the amount of oil in the oil storage part of the support mechanism increases, the oil level rises, and the buoyancy of the regulating valve gradually increases; when the speed of the compressor exceeds the first critical speed, the buoyancy of the regulating valve is greater than the elastic force of the elastic member on the regulating valve, the regulating valve overcomes the elastic force of the elastic member and begins to move in the direction of opening the return channel. At this time, the lubricating oil in the oil storage part of the support mechanism can be recovered to the oil pool at the bottom of the compressor through the oil return channel or the oil return channel and the channel assembly, and the oil return speed is accelerated. Furthermore, the greater the speed of the compressor, the higher the liquid level in the oil storage part of the support mechanism, the larger the cross-sectional area of ​​the open oil return channel, and the faster the oil return, thereby ensuring that the amount of oil in the oil storage part of the support mechanism is always in a suitable position, thereby improving the reliability of the compressor operation at different speeds.

[0021] That is, the oil return control mechanism of the present invention, when the regulating valve and the elastic member are in the first state, the lubricating oil in the oil storage part of the supporting mechanism is recovered to the oil pool through the channel assembly; when the regulating valve and the elastic member are in the second state, the lubricating oil in the oil storage part of the supporting mechanism is recovered to the oil pool through the oil return channel or the oil return channel and the channel assembly, which can ensure that the oil amount in the oil storage part of the compressor support mechanism is controlled within a reasonable range when the compressor is running at low or high speed, thereby improving the operating reliability of the compressor and solving the technical problem that the oil return structure in the prior art cannot well control the oil storage amount in the compressor when the compressor is running at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a schematic diagram of a preferred embodiment of the compressor of the present invention;

[0024] Figure 2 is a schematic diagram of a first preferred embodiment of the oil return control mechanism of the present invention;

[0025] Figure 3 is a perspective view of a first preferred embodiment of the oil return control mechanism of the present invention;

[0026] Figure 4 It is a schematic diagram of the first preferred embodiment of the oil return control mechanism of the present invention when the return channel is closed;

[0027] Figure 5 Schematic diagram of the first preferred embodiment of the oil return control mechanism of the present invention when the return channel is opened;

[0028] Figure 6 It is a curve diagram showing the relationship between the oil level height of the oil storage part of the support mechanism of the present invention and the rotation speed of the rotating shaft;

[0029] Figure 7 is a schematic diagram of a second preferred embodiment of the oil return control mechanism of the present invention;

[0030] Figure 8 is a schematic diagram of a third preferred embodiment of the oil return control mechanism of the present invention;

[0031] Fig. 9 is a schematic diagram of a second preferred embodiment of the regulating valve of the present invention;

[0032] Fig.10 is a perspective view of a second preferred embodiment of a regulating valve of the present invention;

[0033] Fig.11 is a schematic diagram of a third preferred embodiment of a regulating valve of the present invention;

[0034] Fig.12 It is a perspective view of a third preferred embodiment of the regulating valve of the present invention.

[0035] In the figure: 1, suction pipe; 2, fixed scroll; 3, movable scroll; 4, upper support mechanism; 5, discharge pipe; 6, stator; 7, rotor; 8, rotating shaft; 8a, oil supply channel; 9, lower support ring; 10, lower cover; 11, vibration damping washer; 12, oil pump; 13, lower support mechanism; 14, screw; 15, housing; 16, auxiliary balance block; 17, main balance block; 18, main bearing; 19, oil return sheet metal; 20, oil return channel; 21 , oil return control mechanism; 211, receiving part; 212, regulating valve; 212a, valve end face; 213, elastic member; 214, sealing pin; 215, connecting hole; 215a, first connecting groove; 216, O-ring; 217, pressure block; 218, annular groove; 218a, second connecting groove; 22, supporting mechanism oil storage part; 23, auxiliary bearing; 24, cover plate; 25, cross sliding ring; 26, sealing ring; 27, upper cover. DETAILED DESCRIPTION

[0036] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0037] The following is attached to the instruction manual Figures 1 to 12 Embodiments 1 to 5 describe the oil return control mechanism and the compressor of the present invention in detail.

[0038] Example 1

[0039] This embodiment describes in detail the first preferred implementation of the oil return control mechanism 21 of the present invention.

[0040] The oil return control mechanism 21 of this embodiment includes a receiving portion 211, a regulating valve 212 and an elastic member 213. Figures 1 to 5 As shown. Preferably, a channel assembly is provided on the regulating valve 212, and the channel assembly is connected to the oil return channel 20 on the upper support mechanism 4. Preferably, the regulating valve 212 and the elastic member 213 are located in the receiving portion 211 and can move along the axial direction of the receiving portion 211 based on the compressor speed, and the regulating valve 212 and the elastic member 213 have a first state of closing the oil return channel 20 and a second state of opening the oil return channel 20; and when the regulating valve 212 and the elastic member 213 are in the first state, the lubricating oil in the oil storage portion 22 of the support mechanism is recovered to the oil pool through the channel assembly; when the regulating valve 212 and the elastic member 213 are in the second state, the lubricating oil in the oil storage portion 22 of the support mechanism is recovered to the oil pool through the oil return channel 20, or the lubricating oil in the oil storage portion 22 of the support mechanism is recovered to the oil pool through the oil return channel 20 and the channel assembly.

[0041] Preferably, when the compressor speed is lower than the first critical speed, the buoyancy of the lubricating oil in the receiving portion 211 on the regulating valve 212 is smaller than the elastic force of the elastic member 213 on the regulating valve 212, and the regulating valve 212 and the elastic member 213 are in the first state of closing the oil return channel 20, such as Figure 4 Preferably, when the compressor speed is higher than the first critical speed, the buoyancy of the lubricating oil in the receiving portion 211 on the regulating valve 212 is greater than the elastic force of the elastic member 213 on the regulating valve 212, and the regulating valve 212 and the elastic member 213 are in the second state of opening the oil return channel 20, and the opening degree of the regulating valve 212 is proportional to the compressor speed, as shown in FIG. Figure 5 and 6 shown.

[0042] When the regulating valve 212 and the elastic member 213 of this embodiment are in the second state, whether the lubricating oil in the oil storage part 22 of the supporting mechanism is recovered to the oil pool through the oil return channel 20 or the lubricating oil in the oil storage part 22 of the supporting mechanism is recovered to the oil pool through the oil return channel 20 is determined by the position of the channel assembly and the compressor speed. Specifically, when the compressor speed exceeds the first critical speed and is less than the second critical speed, the buoyancy of the lubricating oil in the receiving part 211 on the regulating valve 212 is greater than the elastic force of the elastic member 213 on the regulating valve 212, and when the regulating valve 212 and the elastic member 213 move upward to open the oil return channel 20 and the connecting hole 215 on the regulating valve 212 is not blocked, the lubricating oil in the oil storage part 22 of the supporting mechanism can be recovered to the oil pool through the oil return channel 20 and the channel assembly. When the compressor speed exceeds the second critical speed, the buoyancy of the lubricating oil in the receiving portion 211 on the regulating valve 212 can cause the regulating valve 212 and the elastic member 213 to move upward to open the return oil passage 20 and the connecting hole 215 on the regulating valve 212 is blocked. At this time, the lubricating oil in the oil storage portion 22 of the support mechanism is recovered to the oil pool through the return oil passage 20.

[0043] Specifically, the first critical speed is the speed of the compressor when the regulating valve 212 and the elastic member 213 just move upward and open the oil return passage 20; the second critical speed is the speed of the compressor when the communicating hole 215 on the regulating valve 212 is just completely blocked when the regulating valve 212 and the elastic member 213 move upward to open the oil return passage 20. For example, the first critical speed is the speed when the compressor operates at a frequency of 30 Hz, and the second critical speed is the speed when the compressor operates at a frequency of 90 Hz.

[0044] In the oil return control mechanism 21 of this embodiment, when the compressor is running at a low speed, the amount of oil in the oil storage part 22 of the support mechanism is small, the oil level is low, and the buoyancy of the regulating valve 212 is smaller than the elastic force of the elastic member 213 on the regulating valve 212. At this time, the regulating valve 212 does not move, and the regulating valve 212 and the elastic member 213 are in the first state of closing the oil return channel 20. The lubricating oil in the oil storage part 22 of the support mechanism is recovered to the oil pool at the bottom of the compressor through the channel assembly, and a proper amount of oil is stored in the oil storage part 22 of the support mechanism to ensure the lubrication of various components of the pump body; when When the speed of the compressor increases, the amount of oil in the oil storage part 22 of the support mechanism increases, the oil level increases, and the buoyancy of the regulating valve 212 gradually increases; when the speed of the compressor exceeds the first critical speed, the buoyancy of the regulating valve 212 is greater than the elastic force of the elastic member 213 on the regulating valve 212, and the regulating valve 212 overcomes the elastic force of the elastic member 213 and begins to move in the direction of opening the return channel. At this time, the lubricating oil in the oil storage part 22 of the support mechanism can be recovered to the oil pool at the bottom of the compressor through the return oil channel 20 or the return oil channel 20 and the channel assembly, and the oil return speed is accelerated. Furthermore, the greater the speed of the compressor, the higher the liquid level of the oil storage part 22 of the support mechanism, the larger the cross-sectional area of ​​the return oil channel 20, and the faster the oil return, thereby ensuring that the amount of oil in the oil storage part 22 of the support mechanism is always in a suitable position, and improving the reliability of the compressor operation at different speeds.

[0045] That is, the oil return control mechanism 21 of this embodiment, when the regulating valve 212 and the elastic member 213 are in the first state, the lubricating oil in the oil storage part 22 of the support mechanism is recovered to the oil pool through the channel assembly; when the regulating valve 212 and the elastic member 213 are in the second state, the lubricating oil in the oil storage part 22 of the support mechanism is recovered to the oil pool through the oil return channel 20 or the oil return channel 20 and the channel assembly, which can ensure that the oil amount in the oil storage part 22 of the compressor support mechanism is controlled within a reasonable range when the compressor is running at a low speed or a high speed, thereby improving the operating reliability of the compressor. Specifically, when the compressor is running at a high speed, it can avoid that the lubricating oil in the shell 15 is accumulated in the oil storage part 22 of the support mechanism, thereby avoiding the reduction of the oil amount at the bottom of the compressor shell 15, resulting in insufficient lubrication between the mating parts, which may easily lead to the temperature increase of the mating parts such as the bearings, the increased friction, and even the burning and wear. At the same time, it can also avoid the problem of excessive oil in the oil storage part 22 of the support mechanism, which may easily lead to excessive oil entering the compression chamber and affecting the performance and reliability of the compressor. That is, the oil return control mechanism 21 of this embodiment solves the problem that the oil return structure in the prior art cannot well control the oil storage amount inside the compressor when the compressor runs at high speed.

[0046] According to a preferred embodiment, the elastic member 213 is located above the regulating valve 212, and the difference between the initial length of the elastic member 213 and the length of the elastic member 213 when it is in the ultimate compression state is not less than the height of the regulating valve 212. Preferably, the elastic member 213 is a spring or elastic rubber. Preferably, the density of the regulating valve 212 is lower than the density of the lubricating oil. In the preferred technical solution of this embodiment, the elastic member 213 is located above the regulating valve 212, and the elastic member 213 can apply a variable pressure to the regulating valve 212 according to the deformation amount to balance the buoyancy of the lubricating oil on the regulating valve 212, so that the regulating valve 212 can flexibly move axially in the receiving portion 211. Further, in the preferred technical solution of this embodiment, the difference between the initial length of the elastic member 213 and the length of the elastic member 213 when it is in the ultimate compression state is not less than the height of the regulating valve 212, so that the return oil channel 20 can be completely closed when the oil volume of the support mechanism oil storage part 22 is low and the buoyancy is small, and the return oil channel 20 can be completely opened when the oil volume of the support mechanism oil storage part 22 is high and the buoyancy is large.

[0047] According to a preferred embodiment, the channel assembly includes a communication hole 215 and a first communication groove 215a. Figures 2 to 5 As shown. Preferably, at least two connecting holes 215 opened along different angles are connected to the oil return channel 20 on the upper support mechanism 4; the first connecting groove 215a is connected to the connecting hole 215 and passes through the valve end face 212a in the axial direction. The connecting hole 215 and the oil return channel 20 on the upper support mechanism 4 mentioned in the preferred technical solution of this embodiment are connected, which means that when the operating frequency of the compressor does not exceed the second critical speed, the connecting hole 215 on the regulating valve 212 is connected to the oil return channel 20. The connecting hole 215 of the preferred technical solution of this embodiment is connected to the oil return channel 20 on the upper support mechanism 4, so that when the oil return channel 20 is closed, the lubricating oil in the oil storage part 22 of the support mechanism can be recovered to the oil pool at the bottom of the shell 15 through the connecting hole 215. On the other hand, during the operation of the compressor, the regulating valve 212 may rotate slightly. If only one connecting hole 215 is provided, the connecting hole 215 may be blocked by the inner wall of the oil return passage 20. The preferred technical solution of this embodiment has at least two connecting holes 215 provided along different angles, which can avoid the problem that the connecting hole 215 in a certain direction is blocked due to the rotation of the regulating valve 212 during the operation of the compressor, so that the lubricating oil cannot be recovered to the oil pool at the bottom of the housing 15 through the connecting hole 215. The first connecting groove 215a of the preferred technical solution of this embodiment is connected with the connecting hole 215 and passes through the valve end face 212a in the axial direction, so that the lubricating oil in the oil storage part 22 of the support mechanism can enter the receiving part 211 through the connecting hole 215 and the first connecting groove 215a and give the regulating valve 212 buoyancy.

[0048] According to a preferred embodiment, the distance from the valve end face 212a to the bottom of the regulating valve 212 is not less than the diameter of the oil return channel 20; the cross-sectional area of ​​the regulating valve 212 is equal to the cross-sectional area of ​​the oil return channel 20, and the cross-sectional area of ​​the connecting hole 215 is smaller than the cross-sectional area of ​​the oil return channel 20. In the preferred technical solution of this embodiment, the distance from the valve end face 212a to the bottom of the regulating valve 212 is not less than the diameter of the oil return channel 20, which can ensure that the regulating valve 212 will not fall out of the receiving portion 211. In the preferred technical solution of this embodiment, the cross-sectional area of ​​the regulating valve 212 is equal to the cross-sectional area of ​​the oil return channel 20, which can ensure that when the compressor is running at a low speed, the regulating valve 212 can completely seal the oil return channel 20, so that the lubricating oil can only flow out from the connecting hole 215 on the channel assembly. The cross-sectional area of ​​the connecting hole 215 is smaller than that of the oil return passage 20. When the oil return passage 20 is closed, the lubricating oil in the oil storage portion 22 of the supporting mechanism is recovered to the oil pool at the bottom of the shell 15 through the connecting hole 215, so that the amount of oil in the oil storage portion 22 of the supporting mechanism is appropriate but not excessive, thereby preventing the oil pump 12 at the bottom of the compressor from having excessive pressure, which may lead to a decrease in the oil pumping efficiency.

[0049] According to a preferred embodiment, the receiving portion 211 is vertically arranged in the upper supporting mechanism 4. Figures 2 to 5 As shown. Preferably, the oil return control mechanism 21 also includes a sealing pin 214, and the sealing pin 214 is arranged above the elastic member 213. The sealing pin 214 of the preferred technical solution of this embodiment is arranged above the elastic member 213. Through the action of the sealing pin 214, not only the axial displacement of the elastic member 213 can be limited, but also a sealing effect can be played to prevent the high-pressure part of the compressor from communicating with the back pressure chamber.

[0050] According to a preferred embodiment, the oil return control mechanism 21 of this embodiment returns oil in the following manner:

[0051] When the compressor is operating normally, the lubricating oil in the oil pool at the bottom of the shell 15 is sucked by the oil pump 12 and transported to the compression mechanism through the oil supply channel 8a for lubrication, sealing and cooling. When the compressor is running at a low speed, the oil flow in the oil supply channel 8a is small, and the amount of oil transported to the oil storage part 22 of the support mechanism is small. At this time, the buoyancy of the lubricating oil on the regulating valve 212 is smaller than the elastic force of the elastic member 213 on the regulating valve 212, and the regulating valve 212 does not move. The return oil channel 20 is closed, and the lubricating oil in the oil storage part 22 of the support mechanism is recovered to the bottom oil pool through the connecting hole 215. The cross-sectional area of ​​the connecting hole 215 is smaller than the cross-sectional area of ​​the return oil channel 20, so that when the return oil channel 20 is closed, the amount of oil in the oil storage part 22 of the support mechanism is appropriate and not excessive, so as to prevent the oil pump 12 at the bottom of the compressor from being over-pressured and causing the pumping efficiency to decrease. As the operating frequency rises, the speed of the rotating shaft 8 increases, the oil pumping amount of the oil pump 12 increases, the oil amount in the oil storage part 22 of the supporting mechanism increases, and the lubricating oil enters the upper part of the receiving part 211 through the first connecting groove 215a, which is equal to the oil level in the oil storage part 22 of the supporting mechanism, and the buoyancy of the regulating valve 212 is increased, pushing the regulating valve 212 to axially displace, opening the return oil channel 20, and part of the lubricating oil in the oil storage part 22 of the supporting mechanism is recovered to the bottom oil pool through the return oil channel 20. The faster the compressor speed, the more oil is pumped, the higher the oil level in the oil storage part 22 of the supporting mechanism, and the larger the opening of the return oil channel 20, thereby preventing excessive lubricating oil from entering the compression mechanism and the refrigeration cycle system, resulting in insufficient oil in the oil pool at the bottom of the compressor, resulting in insufficient lubrication of the mating parts and wear, etc., thereby improving the operating reliability of the compressor. The relationship between the oil level height of the oil storage part 22 of the compressor support mechanism and the speed of the rotating shaft 8 is as follows: Figure 6 As shown. Figure 6 As shown, when the regulating valve 212 is opened, the speed of the rotating shaft 8 is 30 rps, and when the regulating valve 212 is opened to the maximum, the speed of the rotating shaft 8 is 90 rps.

[0052] Example 2

[0053] This embodiment describes in detail the second preferred implementation of the oil return control mechanism 21 of the present invention.

[0054] The difference between this embodiment and the first embodiment is that the structure of the channel assembly on the regulating valve 212 is different. This embodiment only describes in detail the parts that are different from the first embodiment, and the same parts are not repeated.

[0055] According to a preferred embodiment, the channel assembly includes an annular groove 218 and a second connecting groove 218a. Figures 9 to 12As shown. Preferably, the annular groove 218 located on the circumference of the regulating valve 212 is connected to the oil return channel 20 on the upper support mechanism 4; the second connecting groove 218a is connected to the annular groove 218 and passes through the valve end face 212a in the axial direction. The annular groove 218 and the oil return channel 20 on the upper support mechanism 4 are connected in the preferred technical solution of this embodiment, which means that when the operating frequency of the compressor does not exceed the second critical speed, the annular groove 218 on the regulating valve 212 is connected to the oil return channel 20. More preferably, the cross-section of the annular groove 218 and / or the second connecting groove 218a can be an arc-shaped structure, such as Fig. 9 More preferably, the cross section of the annular groove 218 and / or the second connecting groove 218a may be a square structure, such as Fig.11 Or as shown in Figure 12. The annular groove 218 and the second connecting groove 218a of the preferred technical solution of this embodiment are not limited to the above shapes and numbers.

[0056] According to a preferred embodiment, the distance from the valve end face 212a to the bottom of the regulating valve 212 is not less than the diameter of the oil return passage 20; the cross-sectional area of ​​the regulating valve 212 is equal to the cross-sectional area of ​​the oil return passage 20, and the cross-sectional area of ​​the annular groove 218 is smaller than the cross-sectional area of ​​the oil return passage 20. In the preferred technical solution of this embodiment, the distance from the valve end face 212a to the bottom of the regulating valve 212 is not less than the diameter of the oil return passage 20, which can ensure that the regulating valve 212 will not fall out of the receiving portion 211.

[0057] The cross-sectional area of ​​the regulating valve 212 of the preferred technical solution of this embodiment is equal to the cross-sectional area of ​​the oil return passage 20, and the cross-sectional area of ​​the annular groove 218 is smaller than the cross-sectional area of ​​the oil return passage 20. When the oil return passage 20 is closed, the lubricating oil in the oil storage part 22 of the supporting mechanism is recovered to the oil pool at the bottom of the shell 15 through the annular groove 218, so that the amount of oil in the oil storage part 22 of the supporting mechanism is appropriate and not excessive, and the oil pump 12 at the bottom of the compressor is prevented from being over-pressured and causing the oil pumping efficiency to decrease. As the speed of the rotating shaft 8 increases, the oil pumping amount of the oil pump 12 increases, and the oil amount in the oil storage part 22 of the supporting mechanism increases. The lubricating oil enters the upper part of the receiving part 211 through the second connecting groove 218a, and is equal to the oil level of the oil storage part 22 of the supporting mechanism, and the buoyancy of the regulating valve 212 is increased, pushing the regulating valve 212 to axially displace, opening the oil return passage 20, and part of the lubricating oil in the oil storage part 22 of the supporting mechanism is recovered to the bottom oil pool through the oil return passage 20, thereby increasing the oil return speed.

[0058] Example 3

[0059] This embodiment describes in detail the third preferred implementation of the oil return control mechanism 21 of the present invention.

[0060] The difference between this embodiment and embodiment 1 or embodiment 2 lies in the different locations of the receiving portion 211 and the sealing member above the elastic member 213. This embodiment only describes the parts that are different from embodiment 1 or embodiment 2 in detail, and the same parts are not described again.

[0061] According to a preferred embodiment, the receiving portion 211 is located on the upper support mechanism 4 and the cover plate 24. Figure 7 Preferably, the oil return control mechanism 21 further includes an O-ring 216, which is located outside the receiving portion 211 in the circumferential direction and between the upper support mechanism 4 and the cover plate 24. Figure 7 As shown. The preferred technical solution of this embodiment can be sealed by an O-ring 216 to separate the high-pressure part and the low-pressure part of the compressor. The receiving portion 211 of the preferred technical solution of this embodiment is located on the upper support mechanism 4 and the cover plate 24, and an O-ring 216 is selected to replace the sealing pin 214, which greatly increases the axial length of the receiving portion 211, and the axial displacement of the regulating valve 212 in the receiving portion 211 is increased, and the return oil channel 20 can be widened on the original basis, so that the range of the adjustable return oil channel 20 is increased, ensuring that the lubricating oil in the oil storage portion 22 of the support mechanism can also be smoothly recovered to the oil pool at the bottom of the shell 15 when the compressor rotates at a higher speed, widening the oil quantity adjustment range of the return oil control mechanism 21, and further improving the reliability of the compressor during operation.

[0062] Preferably, the regulating valve 212 is fitted against the inner wall of the receiving portion 211, one end of the elastic member 213 is arranged above the regulating valve 212, and the other end of the elastic member 213 is fitted against the bottom of the receiving portion 211 opened by the cover plate 24, so that a variable elastic force can be applied to the regulating valve 212 according to the deformation amount of the elastic member 213 to balance the buoyancy of the lubricating oil on the regulating valve 212, so that the regulating valve 212 can flexibly move axially.

[0063] Preferably, in order to allow the oil return channel 20 to be completely closed when the oil amount in the oil storage part 22 of the support mechanism is low and the buoyancy is small, and to allow the oil return channel 20 to be completely opened when the oil amount in the oil storage part 22 of the support mechanism is high and the buoyancy is large, the bottom surface of the regulating valve 212 is located above the oil return channel 20 when the elastic member 213 is extremely compressed.

[0064] Example 4

[0065] This embodiment describes in detail the fourth preferred implementation of the oil return control mechanism 21 of the present invention.

[0066] The difference between this embodiment and embodiment 1 or embodiment 2 lies in the different locations of the receiving portion 211 and the sealing member above the elastic member 213. This embodiment only describes the parts that are different from embodiment 1 or embodiment 2 in detail, and the same parts are not described again.

[0067] According to a preferred embodiment, the receiving portion 211 is tiltedly arranged in the upper supporting mechanism 4. Figure 8 Preferably, one end of the receiving portion 211 is connected to the oil return channel 20, and the other end passes through the side wall of the upper support mechanism 4. The oil return control mechanism 21 also includes a pressure block 217, which is located in the receiving portion 211 and above the elastic member 213. Figure 8 shown.

[0068] Specifically, the receiving portion 211 of the preferred technical solution of this embodiment is arranged in the upper support mechanism 4 and inclined at a certain angle, one end is connected to the return oil channel 20, and the other end passes through the side wall of the upper support mechanism 4, the regulating valve 212, the elastic member 213 and the pressure block 217 are arranged in the receiving portion 211, and the regulating valve 212 can move axially along the receiving portion 211, so as to open or close the return oil channel 20.

[0069] The preferred technical solution of this embodiment applies a variable pressure to the regulating valve 212 according to the deformation of the elastic member 213 to balance the buoyancy of the lubricating oil on the regulating valve 212, so that the regulating valve 212 can be flexibly moved axially. The preferred technical solution of this embodiment can limit the displacement of the elastic member 213 through the pressing block 217. In this embodiment, since both ends of the receiving portion 211 are high-pressure parts, there is no requirement for sealing. The pressing block 217 is only used to limit the movement of the elastic member 213, which simplifies the structure and installation process of the oil return control mechanism 21, and further improves the reliability of the compressor during operation.

[0070] Example 5

[0071] This embodiment describes the compressor of the present invention in detail.

[0072] The compressor of this embodiment comprises the oil return control mechanism 21 and the upper support mechanism 4 of any one of the technical solutions in Embodiments 1 to 4, and the oil return control mechanism 21 is arranged on the upper support mechanism 4.

[0073] Preferably, the compressor of this embodiment is a scroll compressor. More preferably, the compressor of this embodiment is a scroll compressor used in air conditioners or heat pumps.

[0074] The remaining components of the scroll compressor are the same as those of the existing scroll compressor. Figure 1 As shown, the scroll compressor of this embodiment has a shell 15, an upper cover 27 and a lower cover 10 forming a closed container. The upper cover 27 is provided with a suction pipe 1 for sucking in refrigerant, and the shell 15 is provided with a discharge pipe 5 for discharging refrigerant. Usually, an oil storage space is formed at the bottom of the closed container to store part of the lubricating oil, which is pumped to the upper space of the shell 15 by the oil pump 12 to lubricate and cool the inside of the compressor.

[0075] like Figure 1As shown, a compression mechanism is arranged on the upper part of the shell 15, and the compression mechanism includes a fixed scroll 2, a movable scroll 3 and a cross slip ring 25. The compression mechanism is mounted on the upper support mechanism 4, and the upper support mechanism 4 cooperates with the shell 15 by welding and is fixed inside the shell 15. The upper support mechanism 4 is provided with a support mechanism oil storage part 22; to store a certain amount of lubricating oil. The rotating shaft 8 has a through oil supply channel 8a inside, and an eccentric part is provided at the upper end, which passes through the upper support mechanism 4 and cooperates with the movable scroll 3. The middle part is sleeved with a motor rotor 7, on which a main balance block 17 and a secondary balance block 16 are arranged to balance the centrifugal force when the compressor is running. A stator 6 is arranged outside the rotor 7 to drive the rotating shaft 8 to rotate. The lower end of the rotating shaft 8 is inserted into the lower support mechanism 13 for fixing, and an oil pump 12 is arranged at the lower end to absorb lubricating oil in the lower oil storage space.

[0076] like Figure 1 As shown, a lower support ring 9 is also provided at the lower part of the housing 15, and the lower support mechanism 13 is fixed to the lower support ring 9 by screws 14. A vibration-damping washer 11 is also provided below the housing 15. The compressor also includes a main bearing 18, an oil return sheet metal part 19, a secondary bearing 23, and a sealing ring 26 provided on a cover plate 24.

[0077] The compressor of this embodiment is provided with an oil return control mechanism 21 of any technical solution in Examples 1 to 4 on the upper support mechanism 4. Through the action of the oil return control mechanism 21, it can ensure that the oil amount in the oil storage part 22 of the compressor support mechanism is controlled within a reasonable range when the compressor is running at a low speed or a high speed, thereby improving the operating reliability of the compressor and solving the technical problem that the oil return structure in the prior art cannot well control the oil storage amount in the compressor when the compressor is running at a high speed.

[0078] In the description of the present invention, it should be noted that, unless otherwise specified, "multiple" means two or more than two; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0079] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0080] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An oil return control mechanism, characterized in that: It comprises a receiving portion (211), a regulating valve (212) and an elastic member (213), wherein the regulating valve (212) is provided with a channel assembly, and the channel assembly is communicated with an oil return channel (20) on an upper support mechanism (4); The regulating valve (212) and the elastic member (213) are located in the receiving portion (211) and are capable of moving along the axial direction of the receiving portion (211) based on the rotation speed of the compressor, and the regulating valve (212) and the elastic member (213) have a first state of closing the oil return passage (20) and a second state of opening the oil return passage (20); and When the regulating valve (212) and the elastic member (213) are in a first state, the lubricating oil in the oil storage portion (22) of the support mechanism is recovered to the oil pool via the channel assembly; when the regulating valve (212) and the elastic member (213) are in a second state, the lubricating oil in the oil storage portion (22) of the support mechanism is recovered to the oil pool via the oil return channel (20), or the lubricating oil in the oil storage portion (22) of the support mechanism is recovered to the oil pool via the oil return channel (20) and the channel assembly.

2. The oil return control mechanism according to claim 1, characterized in that: When the compressor speed is lower than a first critical speed, the buoyancy of the lubricating oil in the receiving portion (211) on the regulating valve (212) is smaller than the elastic force of the elastic member (213) on the regulating valve (212), and the regulating valve (212) and the elastic member (213) are in a first state of closing the oil return passage (20); When the speed of the compressor is higher than a first critical speed, the buoyancy of the lubricating oil in the housing portion (211) on the regulating valve (212) is greater than the elastic force of the elastic member (213) on the regulating valve (212), and the regulating valve (212) and the elastic member (213) are in a second state in which the oil return passage (20) is opened, and the opening degree of the regulating valve (212) is proportional to the speed of the compressor.

3. The oil return control mechanism according to claim 1 or 2, characterized in that: The elastic member (213) is located above the regulating valve (212), and the difference between the initial length of the elastic member (213) and the length of the elastic member (213) when it is in an extreme compression state is not less than the height of the regulating valve (212).

4. The oil return control mechanism according to claim 1, characterized in that: The channel assembly comprises a connecting hole (215) and a first connecting groove (215a), wherein at least two connecting holes (215) opened along different angles are connected to the oil return channel (20) on the upper support mechanism (4); the first connecting groove (215a) is connected to the connecting hole (215) and passes through the valve end face (212a) in the axial direction, and the cross-sectional area of ​​the connecting hole (215) is smaller than the cross-sectional area of ​​the oil return channel (20).

5. The oil return control mechanism according to claim 1, characterized in that: The channel assembly comprises an annular groove (218) and a second connecting groove (218a), wherein the annular groove (218) located in the circumferential direction of the regulating valve (212) is connected to the oil return channel (20) on the upper support mechanism (4); the second connecting groove (218a) is connected to the annular groove (218) and passes through the valve end face (212a) in the axial direction, and the cross-sectional area of ​​the annular groove (218) is smaller than the cross-sectional area of ​​the oil return channel (20).

6. The oil return control mechanism according to claim 4 or 5, characterized in that: The distance from the valve end surface (212a) to the bottom of the regulating valve (212) is not less than the diameter of the oil return passage (20); and the cross-sectional area of ​​the regulating valve (212) is equal to the cross-sectional area of ​​the oil return passage (20).

7. The oil return control mechanism according to claim 1, characterized in that: The receiving portion (211) is vertically arranged in the upper supporting mechanism (4); the oil return control mechanism further comprises a sealing pin (214); and the sealing pin (214) is arranged above the elastic member (213).

8. The oil return control mechanism according to claim 1, characterized in that: The receiving portion (211) is located on the upper support mechanism (4) and the cover plate (24), and the oil return control mechanism further comprises an O-type sealing ring (216), wherein the O-type sealing ring (216) is located on the circumferential outer side of the receiving portion (211) and between the upper support mechanism (4) and the cover plate (24).

9. The oil return control mechanism according to claim 1, characterized in that: The receiving portion (211) is obliquely arranged in the upper supporting mechanism (4); one end of the receiving portion (211) is connected to the oil return channel (20), and the other end passes through the side wall of the upper supporting mechanism (4); the oil return control mechanism also includes a pressure block (217); the pressure block (217) is located in the receiving portion (211) and above the elastic member (213).

10. A compressor, characterized in that: It comprises the oil return control mechanism and an upper support mechanism (4) as claimed in any one of claims 1 to 9, and the oil return control mechanism is arranged on the upper support mechanism (4).

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