Compressor liquid accumulator and variable frequency compressor

Abstract

The invention discloses a compressor liquid reservoir and a variable frequency compressor, comprising an air inlet straight pipe, which is arranged at the upper opening of a liquid reservoir cylinder; an air outlet straight pipe is arranged in a lower cavity of the liquid reservoir cylinder; an upper end portion of the straight pipe of the air outlet straight pipe is connected to the upper cavity, and a lower end portion of the straight pipe of the air outlet straight pipe penetrates the lower opening of the liquid reservoir cylinder and is connected to an air outlet bent pipe; a plurality of oil return port groups are vertically spaced at intervals on the air outlet straight pipe; each oil return port group comprises one or more oil return ports; a ratio of an equivalent diameter of each oil return port to an outer diameter of the air outlet straight pipe is 0.03-0.12; the invention arranges the oil return ports at different heights of the air outlet straight pipe, and the equivalent diameter of a single oil return port is greatly reduced, so that the amount of oil refluxed into the pump body can be effectively controlled; the liquid refrigerant flowing into the air intake straight pipe through the oil return port is throttled to ensure that the pump body can reliably inhale the refrigerant gas; the same cross-sectional layout of the plurality of oil return ports can make the oil return of the refrigerator oil more uniform.

Description

Technical Field

[0001] The invention belongs to the technical field of air-conditioning compressors, and in particular relates to a compressor liquid accumulator and a variable frequency compressor. Background Art

[0002] When the variable frequency compressor is running under different working conditions, the amount of refrigerant circulating in the system is different; when the system circulation volume is low, a large amount of refrigerant will accumulate in the compressor accumulator, and the refrigerant gas contains liquid refrigerant that has not been completely evaporated; in order to prevent the liquid refrigerant from being sucked into the compressor pump body, and then impacting the pump body valve plate, causing the compressor to fail; the accumulator connected to the compressor air inlet plays the role of gas-liquid separation, which is used to separate the liquid refrigerant that is not completely vaporized, and ensure the dryness of the refrigerant entering the compressor pump body; the compressor accumulator is connected to the cylinder suction port in the compressor pump body through the outlet elbow by pipe welding.

[0003] In order to ensure the lubrication of the running parts of the pump body and the sealing between the matching gaps of the pump body, an appropriate amount of refrigeration oil will be injected into the bottom of the compressor. There is a certain compatibility between the refrigeration oil and the refrigerant. Among them, a part of the refrigeration oil will circulate in the air-conditioning system with the refrigerant. When the compressor runs for a certain period of time, the refrigeration oil will gradually accumulate and increase in the lower part of the liquid reservoir. In order to return the refrigeration oil to the compressor pump body, an oil return hole is usually set near the lower port of the liquid reservoir outlet straight pipe. The oil return hole in the existing structure is generally a round hole with a diameter of less than 1.8mm. However, in the actual compressor, due to the inappropriate position and aperture of the oil return hole, the amount of oil stored in the liquid reservoir will increase during the high-frequency to low-frequency conversion process, and the amount of oil flowing into the pump body through the oil return hole will increase significantly, occupying the effective volume of the pump body suction gas, especially the refrigeration system with R32 / R410a as the working medium. On the other hand, due to the existence of the oil return hole, the liquid refrigerant will also flow into the compressor pump body through the oil return hole without complete evaporation, resulting in reduced reliability of the compressor. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a compressor accumulator and a variable frequency compressor to solve the problem that liquid refrigerant easily enters the compressor pump body through the oil return hole of the compressor accumulator, resulting in reduced reliability of the compressor.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides a compressor liquid accumulator, comprising an air inlet straight pipe, an air outlet straight pipe, an air outlet bent pipe, a filter assembly and a liquid accumulator cylinder; the liquid accumulator cylinder is a closed hollow cavity structure with upper and lower openings; the filter assembly is arranged in the liquid accumulator cylinder, and divides the interior of the liquid accumulator cylinder into an upper cavity and a lower cavity;

[0007] The air inlet straight pipe is arranged at the upper opening of the liquid reservoir cylinder; one end of the air inlet straight pipe is connected to the upper opening of the liquid reservoir cylinder, and the other end is used to be connected to the air intake pipeline of the air conditioner; the air outlet straight pipe is arranged in the lower cavity of the liquid reservoir cylinder; the straight pipe upper end of the air outlet straight pipe is connected to the upper cavity, and the straight pipe lower end of the air outlet straight pipe passes through the lower opening of the liquid reservoir cylinder and is connected to the air outlet elbow;

[0008] A plurality of oil return port groups are vertically spaced apart on the straight air outlet pipe; each oil return port group includes one or more oil return ports; the ratio of the equivalent diameter of each oil return port to the outer diameter of the straight air outlet pipe is 0.03-0.12.

[0009] Furthermore, the ratio of the length of the center of the oil return port from the lower end of the straight pipe to the total length of the air outlet straight pipe is 0.25-0.5.

[0010] Furthermore, the straight air outlet pipe is vertically arranged in the lower cavity, and the straight air outlet pipe is coaxially arranged with the liquid storage cylinder.

[0011] Furthermore, when the refrigerant is R32 or R410a, the ratio of the equivalent diameter of each oil return port to the outer diameter of the straight outlet pipe is 0.03-0.08.

[0012] Furthermore, when the refrigerant is R290, the ratio of the equivalent diameter of each oil return port to the outer diameter of the straight air outlet pipe is 0.07-0.12.

[0013] Furthermore, in each level of oil return port group, multiple oil return ports are evenly distributed or asymmetrically arranged.

[0014] Furthermore, in two adjacent oil return port groups, the oil return ports are evenly distributed or asymmetrically arranged.

[0015] Furthermore, the shape of the oil return port is a circular hole, a triangle, a quadrilateral or an irregular shape.

[0016] The present invention also provides a variable frequency compressor, including a liquid reservoir and a compressor pump body; the liquid reservoir adopts the compressor liquid reservoir; wherein one end of the outlet elbow is connected to the lower end of the straight pipe of the outlet straight pipe, and the other end is connected to the air intake port of the compressor pump body.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a compressor accumulator and a variable frequency compressor, which adopt the method of arranging oil return port groups at different heights of an air outlet straight pipe, each oil return port group includes one or more oil return ports, and the ratio of the equivalent diameter of each oil return port to the outer diameter of the air outlet straight pipe is set to 0.03-0.12; by arranging the oil return ports at different heights of the air outlet straight pipe and greatly reducing the equivalent diameter of a single oil return port, the amount of oil refluxed into the pump body can be effectively controlled; at the same time, the liquid refrigerant flowing into the interior of the air intake straight pipe through the oil return port is throttled and evaporated again, ensuring that the pump body can reliably absorb the refrigerant gas; the same cross-sectional layout of multiple oil return ports can make the refrigeration oil return more uniform; the reliability of the compressor is improved, the effective volume of the compressor pump body is ensured, and the gas transmission capacity is improved.

[0019] Furthermore, by reducing the size of the oil return port, moving it upwards and arranging multiple ports, the variable frequency compressor can adapt to operation under multiple working conditions. Due to the switching from high frequency to low frequency and defrost shutdown, and from high speed to low speed, a large amount of refrigerant and refrigeration oil is stored in the liquid reservoir.

[0020] Furthermore, since different refrigerant media have different viscosities, when the refrigerant is R32 or R410a, the ratio of the equivalent diameter of each oil return port to the outer diameter of the outlet straight pipe is 0.03-0.08; when the refrigerant is R290, the ratio of the equivalent diameter of each oil return port to the outer diameter of the outlet straight pipe is 0.07-0.12; the equivalent diameter of the oil return port is adjusted in a targeted manner, which effectively improves the situation where the return oil may be insufficient, and the compressor has high low-frequency volumetric efficiency.

[0021] Furthermore, the shape and arrangement rules of the oil return port are simple, the application range is wide, and the processing and manufacturing are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the compressor liquid accumulator of the present invention;

[0023] Figure 2 is a cross-sectional view taken along line AA of the compressor accumulator according to the present invention;

[0024] Figure 3 It is a schematic diagram of the gas outlet straight pipe structure in the present invention;

[0025] Figure 4 It is a cross-sectional view of the oil return port of the straight air outlet pipe in the present invention;

[0026] Figure 5 It is a structural schematic diagram of the variable frequency compressor described in the present invention.

[0027] Among them, 100 is a liquid reservoir, 200 is a compressor pump body; 101 is an air inlet straight pipe, 102 is an air outlet straight pipe, 103 is an air outlet elbow, 104 is a filter assembly, 105 is a liquid reservoir cylinder; 1021 is an upper end port of a straight pipe, 1022 is an oil return port, 1023 is a lower end port of a straight pipe; 201 is a cylinder, 2011 is an air intake port. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] As attached Figure 1-4 As shown, the present invention provides a compressor liquid accumulator, comprising an air inlet straight pipe 101, an air outlet straight pipe 102, an air outlet elbow 103, a filter assembly 104 and a liquid accumulator cylinder 105; the liquid accumulator cylinder 105 is a hollow cavity structure with upper and lower openings and a closed structure; the upper opening of the liquid accumulator cylinder is an inlet end, and the lower opening is an outlet end; the filter assembly 104 is arranged in the liquid accumulator cylinder 105, and the filter assembly 104 divides the interior of the liquid accumulator cylinder 105 into an upper cavity and a lower cavity ; The filter assembly 104 is arranged near the inlet end of the liquid reservoir cylinder 105, and is used for filtering the refrigerant; the air inlet straight pipe 101 is arranged at the inlet end of the liquid reservoir cylinder 105, one end of the air inlet straight pipe 101 is connected to the inlet end of the liquid reservoir cylinder 105, and the other end is connected to the air intake pipeline of the air conditioner; the air outlet straight pipe 102 is vertically arranged in the lower cavity of the liquid reservoir cylinder 105, and the air outlet straight pipe 102 is coaxially arranged with the liquid reservoir cylinder 105.

[0030] The straight pipe upper port 1021 of the air outlet straight pipe 102 is connected to the upper cavity, and the straight pipe lower port 1023 of the air outlet straight pipe 102 passes through the outlet end of the liquid storage cylinder 105 and is connected to the air outlet elbow pipe 103; one end of the air outlet elbow pipe 103 is connected to the straight pipe lower port 1023, and the other end is connected to the air intake port 2011 of the cylinder 201 of the compressor pump body 200; a plurality of oil return port groups are vertically spaced on the air outlet straight pipe 102; each oil return port group includes one or more oil return ports 1022; preferably, the number of oil return ports 1022 in each oil return port group is at most three; the ratio of the equivalent diameter of each oil return port 1022 to the outer diameter of the air outlet straight pipe 102 is 0.03-0.12.

[0031] Specifically, according to the different working fluid characteristics of the coolant, the selected refrigeration oil viscosity is different, and the ratio of the equivalent diameter of each oil return port 1022 to the outer diameter of the outlet straight pipe 102 is also different; wherein, when the refrigerant is R32 working fluid or R410a working fluid, the ratio of the equivalent diameter of each oil return port 1022 to the outer diameter of the outlet straight pipe 102 is 0.03-0.08; when the refrigerant is R290 working fluid, the ratio of the equivalent diameter of each oil return port 1022 to the outer diameter of the outlet straight pipe 102 is 0.07-0.12; wherein, the ratio of the equivalent diameter of each oil return port 1022 to the outer diameter of the outlet straight pipe 102 is recorded as K1 value; when the number of oil return ports in each level of oil return port group is at most three, the value range of K1 value is as shown in Table 1 below.

[0032] Table 1 The ratio of the equivalent diameter of the oil return port to the outer diameter of the straight outlet pipe

[0033]

[0034] In the present invention, the ratio of the length of the center of the oil return port 1022 to the lower end port 1023 of the straight pipe to the total length of the outlet straight pipe is 0.25-0.5; wherein, the ratio of the length of the center of each oil return port 1022 to the lower end port 1023 of the straight pipe to the total length of the outlet straight pipe is recorded as K2 value; when the coolant is R32 working fluid, a maximum of six oil return port groups are arranged on the outlet straight pipe 102, and the number of oil return ports in each oil return port group is at most three, the value ranges of the K1 value and the K2 value are as shown in Table 3 below.

[0035] Table 2 K1 and K2 value ranges

[0036]

[0037]

[0038] It can be seen from Table 2 above that the ratio of the length h of the center position of the oil return port on the wall of the air outlet straight pipe 102 from the lower end of the air outlet straight pipe to the total length L of the air outlet straight pipe is 0.25-0.5; when there are two or more oil return ports, the center positions of the multiple oil return ports are at different distances from the lower end surface of the air outlet straight pipe, and the ratio of the length h of the center position from the lower end of the air outlet straight pipe to the total length L of the air outlet straight pipe is 0.03-0.5.

[0039] In the present invention, the multiple oil return ports 1022 in each level of the oil return port group are evenly distributed or asymmetrically arranged, that is, the multiple oil return ports 1022 on the same cross section of the outlet straight pipe 102 are evenly distributed or asymmetrically arranged; the oil return ports 1022 in two adjacent oil return port groups are evenly distributed or asymmetrically arranged, that is, the oil return ports 1022 on different cross sections of the outlet straight pipe 102 are evenly distributed or asymmetrically arranged; preferably, the oil return ports 1022 are circular, triangular, quadrilateral or irregular in shape; in the present invention, the cross-sectional area of ​​the oil return port can be equivalently converted to a circular hole of a certain diameter, and the diameter of the circular hole is The diameter is the equivalent diameter of the irregular surface; wherein, the ratio of the equivalent diameter d of a single oil return port to the outer diameter D of the outlet straight pipe is 0.03-0.12; for different working fluid characteristics, due to the different viscosities of the selected refrigeration oil, the range of the ratio of the equivalent diameter d of the oil return port to the outer diameter D of the outlet straight pipe is different; wherein, the R32 / R410a working fluid mostly adopts the ratio of 0.03-0.08, at which time the low-frequency volumetric efficiency of the compressor is the highest; for the R290 working fluid, the ratio is 0.07-0.12, at which time the low-frequency volumetric efficiency of the compressor is the highest.

[0040] As attached Figure 5 As shown, the present invention also provides a variable frequency compressor, including a liquid reservoir 100 and a compressor pump body 200; the liquid reservoir 100 adopts the above-mentioned compressor liquid reservoir; the structure of the liquid reservoir 100 is not repeated here; one end of the air outlet elbow 103 is connected to the straight pipe lower port 1023 of the air outlet straight pipe 102, and the other end is connected to the air intake port 2011 of the cylinder 201 in the compressor pump body 200.

[0041] Working principle:

[0042] In the compressor accumulator and variable frequency compressor described in the present invention, the outlet elbow 103 is connected to the air intake port 2011 of the cylinder 201 of the compressor pump body 200; the inlet end of the accumulator cylinder 105 is connected to the air intake pipeline of the air conditioner through the air inlet straight pipe 101, so that when the refrigerant circulation volume of the air-conditioning system is low, it plays the role of storing refrigerant liquid and making the refrigerant liquid fully circulated inside the accumulator cylinder, ensuring that the refrigerant entering the compressor pump body is in a gaseous state; at the same time, the refrigeration oil stored in the accumulator cylinder flows back to the compressor pump body through the oil return port 1023 on the outlet straight pipe 102, so that the rotating parts of the compressor are effectively lubricated.

[0043] The liquid storage cylinder 105 is set as a closed cavity structure, and the refrigerant enters the upper cavity of the liquid storage cylinder 105 from the air inlet straight pipe 101, and is retained in the upper cavity after being filtered by the filter assembly 104; since the gaseous refrigerant contains liquid refrigerant, the liquid refrigerant can evaporate into gas in the upper cavity; the gaseous refrigerant flows into the air outlet straight pipe 102 through the straight pipe upper port 1021 of the air outlet straight pipe 102, and then enters the compressor pump body through the air outlet elbow 103; the liquid refrigeration oil is filtered by the filter assembly 104 and sinks to the bottom of the lower cavity; when the oil level of the liquid refrigeration oil in the lower cavity reaches the oil return port on the air outlet straight pipe 102, the liquid refrigeration oil flows into the interior of the air outlet straight pipe 102 through the oil return port, and enters the compressor pump body, so as to lubricate the rotating parts in the compressor pump body.

[0044] In the present invention, a plurality of oil return port groups are vertically spaced on the outlet straight pipe 102; each oil return port group includes one or more oil return ports 1022; the ratio of the equivalent diameter of each oil return port 1022 to the outer diameter of the outlet straight pipe 102 is 0.03-0.12; the longitudinal and transverse arrangement of multiple oil return ports can greatly adapt to the operation of the variable frequency compressor under multiple working conditions. Due to the switching of the compressor speed from high speed to low speed due to high frequency to low frequency and defrost shutdown, a large amount of refrigerant and refrigeration oil are stored in the liquid reservoir. By greatly reducing the equivalent diameter of a single oil return port, the amount of oil returning to the pump body can be effectively controlled; at the same time, the liquid refrigerant flowing into the suction straight pipe through the small oil return port is throttled and evaporated again, ensuring that the pump body can reliably inhale the refrigerant gas.

[0045] The compressor liquid accumulator described in the present invention selects different viscosities of refrigeration oil according to different refrigerant working fluids, and makes targeted adjustments to the equivalent diameter of the return oil port, which effectively solves the problem of insufficient oil return and insufficient lubrication of the compressor pump body; at the same time, the same cross-sectional layout of multiple oil return ports can make the return of the refrigeration oil more uniform; it is suitable for variable frequency compressors R32, R410a or R290 working fluids, can solve the problem of excessive oil return when switching from high speed to low speed, and can solve the secondary evaporation of liquid refrigerant in the liquid accumulator through the oil return port, ensuring that the pump body can reliably inhale refrigerant gas.

[0046] The vent pipe is connected with the air inlet of the air conditioner through the air inlet pipe, and the vent pipe is connected with the air inlet pipe of the air conditioner through the air inlet pipe. Uniform or asymmetrical distribution, multiple oil return holes can be uniformly or asymmetrically distributed on cross-sections at different heights; the ratio of the equivalent diameter of the oil return hole to the outer diameter of the outlet straight pipe is 0.03-0.08 when the working medium is R32 / R410a, and the compressor has high low-frequency volumetric efficiency; the ratio of the equivalent diameter of the oil return hole to the outer diameter of the outlet straight pipe is 0.08-0.12 when the working medium is R290, and the compressor has high low-frequency volumetric efficiency; wherein, when there are multiple oil return ports, the equivalent diameter of the oil return port should select a smaller ratio value in the above ratio range; the variable frequency compressor has high volumetric efficiency when operating at low frequency; the oil return port is suitable for but not limited to the variable frequency system, and when operating at low frequency, the low-frequency oil return volume can be effectively suppressed by the layout of the oil return port position, the equivalent diameter and the positions of multiple oil return ports, and at the same time, it is beneficial to the complete evaporation of the liquid refrigerant, improving the low-frequency volumetric efficiency while ensuring the reliable operation of the compressor.

[0047] The compressor accumulator and variable frequency compressor of the present invention can adapt to the operation of variable frequency compressor under multiple working conditions by shrinking, moving up and arranging multiple ports; due to the large amount of storage of refrigerant and refrigeration oil in the accumulator when switching from high frequency to low frequency and defrosting shutdown, and high speed to low speed, oil return ports of different heights are arranged, and the equivalent diameter of a single oil return port is greatly reduced, which can effectively control the amount of oil refluxed into the pump body. At the same time, the liquid refrigerant flowing into the suction straight pipe through the small oil return port is throttled and evaporated twice, ensuring that the pump body can reliably inhale refrigerant gas; the viscosity of the refrigeration oil selected according to different working fluids is different, and the equivalent diameter of the oil return port is adjusted in a targeted manner, which well solves the problem of insufficient oil return; at the same time, the same cross-section layout of multiple oil return ports can make the refrigeration oil return more uniform; it can not only inhibit the liquid refrigerant from entering the compressor pump body, causing compressor reliability problems, but also inhibit the excessive refrigeration oil reflux during low-frequency operation, resulting in a decrease in the effective volume of the pump body and a decrease in gas transmission capacity.

[0048] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A compressor accumulator, characterized in that: The invention comprises an air inlet straight pipe (101), an air outlet straight pipe (102), an air outlet bent pipe (103), a filter assembly (104) and a liquid reservoir cylinder (105); the liquid reservoir cylinder (105) is a hollow cavity structure with upper and lower openings and a closed structure; the filter assembly (104) is arranged in the liquid reservoir cylinder (105) and divides the interior of the liquid reservoir cylinder (105) into an upper cavity and a lower cavity; The air inlet straight pipe (101) is arranged at the upper opening of the liquid reservoir cylinder (105); one end of the air inlet straight pipe (101) is connected to the upper opening of the liquid reservoir cylinder (105), and the other end is used to be connected to the air intake pipeline of the air conditioner; the air outlet straight pipe (102) is arranged in the lower cavity of the liquid reservoir cylinder (105); the straight pipe upper end (1021) of the air outlet straight pipe (102) is connected to the upper cavity, and the straight pipe lower end (1023) of the air outlet straight pipe (102) passes through the lower opening of the liquid reservoir cylinder (105) and is connected to the air outlet elbow (103); A plurality of oil return port groups are vertically spaced apart on the straight air outlet pipe (102); each oil return port group comprises one or more oil return ports (1022); the ratio of the equivalent diameter of each oil return port (1022) to the outer diameter of the straight air outlet pipe (102) is 0.03-0.12; The ratio of the length of the center of the oil return port (1022) to the lower end port (1023) of the straight pipe to the total length of the air outlet straight pipe is 0.25-0.5; When the refrigerant is R32 or R410a, the ratio of the equivalent diameter of each oil return port (1022) to the outer diameter of the straight outlet pipe (102) is 0.03-0.08; When the refrigerant is R290, the ratio of the equivalent diameter of each oil return port (1022) to the outer diameter of the straight air outlet pipe (102) is 0.07-0.

12.

2. A compressor accumulator according to claim 1, characterized in that: The straight air outlet pipe (102) is vertically arranged in the lower cavity, and the straight air outlet pipe (102) is coaxially arranged with the liquid storage cylinder (105).

3. A compressor accumulator according to claim 1, characterized in that: In each level of oil return port group, multiple oil return ports (1022) are evenly distributed or asymmetrically arranged.

4. A compressor accumulator according to claim 1, characterized in that: In two adjacent oil return port groups, the oil return ports (1022) are evenly distributed or asymmetrically arranged.

5. A compressor accumulator according to claim 1, characterized in that: The shape of the oil return port (1022) is a circular hole, a triangle, a quadrilateral or an irregular shape.

6. A variable frequency compressor, comprising a liquid storage device (100) and a compressor pump body (200); characterized in that: The liquid reservoir (100) adopts the compressor liquid reservoir as described in any one of claims 1 to 5; wherein one end of the outlet elbow pipe (103) is connected to the straight pipe lower port (1023) of the outlet straight pipe (102), and the other end is connected to the air intake port (2011) of the compressor pump body (200).

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