Compressor and refrigeration apparatus

Abstract

The application discloses a compressor and a refrigeration device, wherein the compressor comprises a shell, a cylinder, a liquid accumulator and a connecting pipe, the bottom of the shell is provided with an oil pool; the cylinder is arranged in the shell, the shell is provided with a suction port communicated with the cylinder; the liquid accumulator is arranged at the lower end or the upper end of the shell, the gas outlet of the liquid accumulator is communicated with the cylinder through the suction port, the inner diameter of the shell is consistent with the inner diameter of the liquid accumulator; the height of the liquid accumulator is H, the maximum vertical distance from the center of the suction port to the bottom of the oil pool is h, the relationship between h and H satisfies 0.1<h / H<2; one end of the connecting pipe extends into the liquid accumulator, and the other end of the connecting pipe is connected with the suction port for refrigerant conveying, wherein the connecting pipe comprises a first pipe section and a second pipe section connected with each other. The technical scheme can reduce the transverse size of the compressor, improve the reliability of the compressor, and facilitate the installation of the connecting pipe.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of August 4, 2022, an application number of "202210930093.2", and an invention title of "Compressor and Refrigeration Equipment". Technical Field

[0002] The present invention relates to the technical field of compressors, and particularly to a compressor and a refrigeration equipment. Background Art

[0003] The liquid reservoir of a traditional compressor is arranged on the side of the housing, resulting in a large radial space occupied by the compressor and generating relatively large vibration and noise during use. The compressor sucks in gaseous refrigerant for compression, and the compression process is completed in the cylinder. In order to maintain good lubrication of the operating components in the cylinder, there must be a certain amount of lubricating oil. In this process, some types of lubricating oil are soluble in the refrigerant, and a part of the lubricating oil (referred to as the oil discharge amount) will be carried away while a large amount of refrigerant gas is discharged from the cylinder. If the oil discharge amount is too large, an oil film will be formed inside the condenser, hindering the heat dissipation of the refrigerant, and thus affecting the refrigeration effect of the refrigeration equipment. If the oil discharge amount is too large, the compressor cylinder will be damaged because there is no oil for lubrication. The refrigeration oil not only plays a lubricating role but also a sealing role. Therefore, the oil level in the oil sump at the bottom of the compressor drops, easily leading to failures of the compressor due to poor lubrication. Summary of the Invention

[0004] The main object of the present invention is to provide a compressor, aiming to reduce the lateral size of the compressor, improve the reliability of the compressor, and facilitate the installation of the connecting pipe.

[0005] To achieve the above object, a compressor proposed by the present invention includes:

[0006] A housing, an oil sump is formed at the bottom of the housing;

[0007] A cylinder, arranged inside the housing, and an air inlet connected to the cylinder is provided on the housing;

[0008] A liquid reservoir, the liquid reservoir is arranged at the lower end or the upper end of the housing, the air outlet of the liquid reservoir is connected to the cylinder through the air inlet, and the inner diameter of the housing is consistent with the inner diameter of the liquid reservoir; the height of the liquid reservoir is H, the maximum vertical distance from the center of the air inlet to the bottom of the oil sump is h, and the relationship between h and H satisfies: 0.1 < h / H < 2; and

[0009] A connecting pipe, one end of the connecting pipe extends into the liquid reservoir, and the other end is connected to the air inlet for conveying refrigerant. Among them, the connecting pipe includes a first pipe segment and a second pipe segment connected to each other.

[0010] Optionally, the first tube segment is located inside the reservoir, one end of the first tube segment is bent toward the top of the reservoir, the other end of the first tube segment extends out of the reservoir, one end of the second tube segment is connected to the extended part of the first tube segment, and the other end of the second tube segment is connected to the air intake.

[0011] Optionally, the first pipe segment and the second pipe segment are integrally formed.

[0012] Optionally, the first pipe section is provided with an oil return hole, the opening of which faces the bottom of the reservoir.

[0013] Optionally, the equivalent diameter of the oil return hole is d1, and the equivalent diameter of the connecting pipe is d2, wherein d1 and d2 satisfy the following condition: 0.1% < (d1) 2 / (d2) 2 )*100%≤1.5%.

[0014] Optionally, the length of the return oil hole is L. a The diameter of the return oil hole is L b Hole length L a and aperture L b Relationship satisfied: 0.5 <L a / L b ≤4.

[0015] Optionally, the effective volume of the reservoir is V, and the volume between the height plane where the oil return hole is located and the bottom of the reservoir is v, wherein the relationship between v and V satisfies: 0.015V <v<0.5V。

[0016] Optionally, the compressor further includes a muffler connected to the cylinder.

[0017] Optionally, the inner diameter of the housing is d3, the volume formed between the upper end face of the cylinder and the upper end face of the muffler and the housing is v1, and the refrigerant charge of the refrigerant system is D, satisfying:

[0018] [Π(h1+h2)×(d3) 2 / 4+v1] / [Π(h1+h2)×(d3) 2 / 4+v1+D]≥0.18.

[0019] The present invention also provides a refrigeration device, including the compressor described above.

[0020] The technical solution of the present invention adopts a housing, a cylinder, and a liquid reservoir. An oil storage pool is formed at the bottom of the housing. The cylinder is arranged inside the housing, and an air inlet connected to the cylinder is provided on the housing. The liquid reservoir is arranged at the lower or upper end of the housing. By arranging the liquid reservoir below or above the housing, the radial installation space required by the compressor can be greatly reduced. The air outlet of the liquid reservoir is connected to the cylinder via the air inlet, and the inner diameter of the housing 10 is consistent with the inner diameter of the liquid reservoir 30. The height of the liquid reservoir is H, and the maximum vertical distance from the center of the air inlet to the bottom of the oil storage pool is h. The relationship between h and H satisfies: 0.1 < h / H < 2. By making the height h of the oil storage pool and the height H of the liquid reservoir satisfy the relationship: 0.1 < h / H < 2, the problem of the oil discharge volume of the compressor can be improved by adjusting the height of the liquid reservoir without enlarging the inner diameter of the housing or increasing the original height of the oil pool. Or, without changing the height and capacity of the liquid reservoir, the problem of the oil discharge volume of the compressor can be improved by increasing the height of the oil storage pool, thereby effectively improving the heat exchange efficiency and energy efficiency index of the refrigeration cycle device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0022] Figure 1 Structural schematic diagram of an embodiment of the compressor of the present invention;

[0023] Figure 2 Relationship curve diagram between the ratio of h / H and the maximum vibration of the compressor;

[0024] Figure 3 Relationship curve diagram between the ratio of h / H and the oil discharge volume of the compressor;

[0025] Figure 4 Structural schematic diagram of another embodiment of the compressor of the present invention;

[0026] Figure 5 For (d1) 2 / (d2) 2 Relationship curve diagram between the ratio and the exhaust gas temperature of the compressor;

[0027] Figure 6 For Figure 1 Enlarged view of part A in;

[0028] Figure 7 For Figure 4Enlarged view of point B in the middle;

[0029] Figure 8 This is a graph showing the relationship between the v / V ratio and the cooling capacity of the compressor.

[0030] Figure 9 This is a graph showing the relationship between the v / V ratio and the compressor input force.

[0031] Explanation of icon numbers:

[0032] 100 compressor 32 Lower cylinder head 10 case 33 air outlet 11 air intake 13 Connecting cover 12 oil storage tank 50 Connecting pipe 20 cylinder 51 First Pipeline Section 21 air intake 52 Second section 30 reservoir 511 oil return hole 31 Cylinder block 60 muffler

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0036] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0037] This invention proposes an embodiment of a compressor. Compressors are generally classified into reciprocating compressors, screw compressors, centrifugal compressors, and linear compressors. A reciprocating compressor typically consists of a housing, electric motor, cylinder, piston, control equipment (starter and thermal protector), and a cooling system. Cooling methods include oil cooling, air cooling, and natural cooling. Linear compressors lack a shaft, cylinder, seals, and heat dissipation structures. The refrigeration and air conditioning industry uses five main types of compressors: reciprocating, screw, rotary, scroll, and centrifugal. Reciprocating compressors are the most widely used in small and medium-sized commercial refrigeration systems. Screw compressors are mainly used in large commercial and industrial systems. Rotary and scroll compressors are mainly used in household and small-capacity commercial air conditioning units, while centrifugal compressors are widely used in air conditioning systems in large buildings. Nowadays, household refrigerator and air conditioner compressors are all positive displacement compressors, which can be further divided into reciprocating and rotary types. Reciprocating compressors use piston, crank, and connecting rod mechanisms or piston, crank, and slide tube mechanisms, while rotary compressors mostly use rolling rotor compressors. In commercial air conditioning, centrifugal, scroll, and screw types are most commonly used.

[0038] Traditional compressors have their receivers located on the side of the casing, resulting in a large radial space occupied by the compressor and significant vibration and noise during operation. The compressor draws in gaseous refrigerant and compresses it within the cylinder. To maintain proper lubrication of the moving parts, a certain amount of lubricating oil is required in the cylinder. During this process, some types of lubricating oil are miscible with the refrigerant, and some lubricating oil is carried away along with the large amount of refrigerant gas expelled from the cylinder (this is called oil discharge). Excessive oil discharge can form an oil film inside the condenser, hindering refrigerant heat dissipation and thus affecting the cooling effect of the refrigeration equipment. Too much oil discharge, on the other hand, can damage the compressor cylinder due to insufficient lubrication. Refrigeration oil not only lubricates but also acts as a sealant; therefore, a drop in the oil level in the oil sump at the bottom of the compressor can easily lead to compressor malfunctions due to poor lubrication. To address the aforementioned issues, common solutions include enlarging the inner diameter of the compressor housing or increasing the height of the oil sump, thereby filling the housing with an excessive amount of refrigerant lubricating oil to prevent the oil level from dropping excessively due to the discharge of some of the refrigerant lubricating oil. However, these solutions increase the cost of the compressor and fail to reduce the amount of lubricating oil contained in the refrigerant gas, resulting in a large amount of refrigerant lubricating oil circulating in the system, directly reducing the system's heat exchange efficiency and energy efficiency index.

[0039] The present invention aims to improve the structural compactness of the liquid reservoir 30 and the housing 10, reduce the lateral dimension of the compressor 100, and improve the reliability of the compressor 100.

[0040] Reference Figure 1In one embodiment of the present invention, the compressor 100 includes: a housing 10, a cylinder 20, and a liquid reservoir 30. An oil reservoir 12 is formed at the bottom of the housing 10. The cylinder 20 is disposed inside the housing 10, and the housing 10 has an air intake 11 communicating with the cylinder 20. The liquid reservoir 30 is disposed at the lower end or the upper end of the housing 10, and the air outlet 33 of the liquid reservoir 30 is connected to the cylinder 20 via the air intake 11. The inner diameter of the housing 10 is the same as the inner diameter of the liquid reservoir 30.

[0041] The height of the liquid reservoir 30 is H, and the maximum vertical distance from the center of the air intake 11 to the bottom of the oil storage tank 12 is h. The relationship between h and H satisfies: 0.1 <h / H<2。

[0042] The center of the intake port 11 is the same as the center of the intake port 21 of the cylinder 20. In the circular intake port 11, the center of the intake port 11 refers to the center of the circle, and in the square intake port 11, it refers to the intersection of the diagonals.

[0043] In one embodiment, the reservoir 30 is disposed at the lower end of the housing 10.

[0044] In another embodiment, the reservoir 30 is disposed at the upper end of the housing 10.

[0045] The inner diameter of the housing 10 is the same as the inner diameter of the reservoir 30. "Same inner diameter" means that within a certain range, the relationship between the inner diameter r1 of the housing 10 and the inner diameter r2 of the reservoir 30 satisfies: 0.98 ≤ r1 / r2 ≤ 1.02. That is, within a certain range, the inner diameter of the housing 10 can be larger than the inner diameter of the reservoir 30. If r1 / r2 > 1.02, the housing 10 and reservoir 30 need structural modifications or additional parts to avoid fitting problems. Alternatively, the inner diameter of the reservoir 30 can be larger than the inner diameter of the housing 10. If r1 / r2 < 0.98, the reservoir 30 and housing 10 also need structural modifications or additional parts to avoid fitting problems. This increases design costs and manufacturing difficulty.

[0046] By placing the liquid receiver 30 below or above the housing 10, the radial installation space required for the compressor 100 can be significantly reduced. Compared to the prior art where the liquid receiver 30 is located on the periphery of the main body, the embodiments of the present invention can improve the structural compactness of the liquid receiver 30 and the housing 10, reduce the lateral dimension of the compressor 100, thereby reducing the overall size of the compressor 100, facilitating the miniaturization of the compressor 100, and increasing the cabinet capacity.

[0047] By ensuring that the height h of the oil reservoir and the height H of the liquid receiver 30 satisfy the relationship 0.1 < h / H < 2, the problem of oil discharge from the compressor 100 can be improved by adjusting the height of the liquid receiver 30 without increasing the inner diameter of the shell 10 or the original height of the oil reservoir. Alternatively, without changing the height and capacity of the liquid receiver 30, the height of the oil reservoir can be increased, allowing for a larger amount of lubricating oil to be filled into the shell 10. This avoids excessive drop in oil level due to partial lubricating oil discharge. Thus, even if some lubricating oil is discharged from the shell 10 with the refrigerant gas, the oil level in the oil reservoir within the shell 10 will not drop significantly, effectively stabilizing the oil level in the oil reservoir of the shell 10 and preventing excessive drop in oil level from affecting the lubrication performance during the compression process of the cylinder 20. At the same time, it can effectively reduce the lubricating oil content in the refrigerant gas discharged after compression by the cylinder 20, significantly reducing the amount of lubricating oil circulating in the refrigeration cycle device, and effectively improving the heat exchange efficiency and energy efficiency index of the refrigeration cycle device.

[0048] For example, in one embodiment, the compressor 100 has a maximum condensing pressure greater than 3 MPa.

[0049] Refer to 2 and Figure 3 Under the premise of fixing the height of the liquid reservoir at 30mm:

[0050] like Figure 2 As shown, when h / H>2, the height h of the oil reservoir 12 is much higher than the height H of the liquid receiver 30. On the one hand, the overall height of the machine increases significantly, and the increase in the height of the oil reservoir 12 causes the cylinder 20 to move upward, and the overall center of gravity of the compressor 100 moves upward in sync, resulting in worsened vibration and greater vibration and noise during use. On the other hand, to maintain the oil level in the compressor 100 at this time, a large amount of oil needs to be sealed, which increases the cost of the compressor 100 and makes it less economical.

[0051] like Figure 3 As shown, when h / H < 0.1, on the one hand, as the space of the oil reservoir 12 decreases, the oil level rises significantly, leading to a further deterioration in the oil discharge. That is, some types of lubricating oil are miscible with the refrigerant, and along with a large amount of refrigerant gas being discharged from the cylinder 20, some lubricating oil is also carried away (called the oil discharge). If the oil discharge is too large, the compressor 100 will be damaged due to lack of oil for lubrication, and the compressor 100 cylinder 20 is prone to failure due to poor lubrication. On the other hand, the closer the liquid receiver 30 is to the cylinder 20, the more likely the deformation of the cylinder 20 sliding vane groove / inner diameter caused by thermal effects will cause sliding vane wear or even jamming, which may lead to reliability risks.

[0052] For example, assuming a fixed oil storage tank height:

[0053] When h / H > 2, the height of the liquid reservoir 30 is too small and the liquid storage capacity is insufficient, which will cause liquid return in the compressor 100 and a decline in performance. For reference, generally, liquid return refers to the phenomenon or process in which the liquid refrigerant in the evaporator returns to the compressor 100 through the suction circuit during the operation of the compressor 100. This is caused by the refrigerant flowing back into the compressor 100 in liquid form and mixing with the lubricating oil. When the lubricating oil is diluted to a sufficiently low level, the bearing cannot be fully lubricated, resulting in increased wear, and then there will be phenomena such as an increase in the current of the compressor 100, a larger noise and vibration, and ultimately the compressor 100 is damaged and the performance of the compressor 100 declines.

[0054] When h / H < 0.1, on the one hand, the height of the liquid reservoir 30 is too large, resulting in waste of too much refrigerant, and on the other hand, it affects the refrigeration effect.

[0055] In another embodiment, the maximum condensation pressure of the compressor 100 is less than 3 MPa. In this usage scenario, the height of the liquid reservoir 30 can be significantly reduced, thereby reducing the size of the compressor 100 in the height direction and thus reducing the overall size of the compressor 100.

[0056] The technical solution of the present invention adopts a housing 10, a cylinder 20 and a liquid reservoir 30. An oil storage pool 12 is formed at the bottom of the housing 10; the cylinder 20 is arranged in the housing 10, and the housing 10 is provided with a suction port 11 communicating with the cylinder 20; the liquid reservoir 30 is arranged at the lower end or the upper end of the housing 10, and the air outlet 33 of the liquid reservoir 30 is connected to the cylinder 20 through the suction port 11, and the inner diameter of the housing is consistent with the inner diameter of the liquid reservoir; the height of the liquid reservoir 30 is H, and the maximum vertical distance from the center of the suction port 11 to the bottom of the oil storage pool is h, and the relationship between h and H satisfies: 0.1 < h / H < 2. By arranging the liquid reservoir 30 below or above the housing 10, the radial installation space required by the compressor 100 can be significantly reduced. By making the height h of the oil storage pool and the height H of the liquid reservoir 30 satisfy the relationship: 0.1 < h / H < 2, the problem of the oil discharge volume of the compressor 100 can be improved by adjusting the height of the liquid reservoir 30 without expanding the inner diameter of the housing 10 or increasing the original height of the oil pool, or, without changing the height and capacity of the liquid reservoir 30, the problem of the oil discharge volume of the compressor 100 can be improved by increasing the height of the oil storage pool, thereby effectively improving the heat exchange efficiency and energy efficiency index of the refrigeration cycle device.

[0057] After the liquid reservoir 30 is placed below the housing 10 of the compressor 100, the oil storage pool is in the high-pressure area and the liquid reservoir 30 is in the low-pressure area. Refer to Figure 4In one embodiment, for ease of installation, the housing 10 further includes a connecting cover 13, which connects the housing 10 and the liquid reservoir 30. In this embodiment, the housing 10 can be configured with openings at both ends, facilitating the installation of internal components. Specifically, the connecting cover 13 and the housing 10 cooperate to form an oil reservoir 12. The height of the housing 10 from the center of the air inlet 21 of the cylinder 20 to the edge of the lower opening is h1. One end of the connecting cover 13 is open, like a bowl, and the height from the lower end of the housing 10 to the bottom of the connecting cover 13 is h2. The relationship between h, h1, and h2 satisfies: h = h1 + h2. Thus, it is only necessary to calculate the relationship between (h1 + h2) and H to satisfy the condition: 0.1 < (h1 + h2) / H < 2. In addition, the bottom of the shell is generally curved. In order to facilitate the measurement of the height of the oil storage tank 12, in the actual measurement process, only the height from the center of the air intake 11 to the lower edge of the shell 10 and the height of the side wall of the connecting cover 13 can be measured from the outside of the shell 10, simplifying the measurement process.

[0058] In another embodiment, the housing 10 has an opening at the top to facilitate the placement of the drive device and cylinder 20, etc. The housing 10 and the connecting cover 30 are integrally formed. The oil reservoir is located at the lower end of the housing 10, and the periphery of the upper opening of the reservoir 30 is welded to the periphery of the lower end of the housing 10 to ensure the sealing of the reservoir 30.

[0059] To facilitate the installation and assembly of the reservoir 30, the reservoir 30 includes a cylinder body 31 with openings at both ends and a lower cylinder cover 32, the lower cylinder cover 32 covering the lower opening of the cylinder body 31.

[0060] In one embodiment, the lower cylinder head 32 is welded to the lower end opening of the cylinder body 31.

[0061] In another embodiment, the lower cylinder head 32 and the cylinder body 31 are integrally formed.

[0062] Combined with reference Figure 4 The reservoir 30 includes a cylinder 31 with openings at both ends and a lower cylinder cover 32. The lower end of the cylinder 31 is connected to the lower cylinder cover 32. The edge of the upper opening of the cylinder 31 is welded to the lower periphery of the connecting cover 13 to ensure sealing. To facilitate the measurement of the height of the reservoir 30, the distance from the edge of the upper opening to the edge of the lower opening of the cylinder 31 is the height H1. The height of H1 is approximately the height of H. Thus, it is only necessary to calculate the relationship between (h1+h2) and H1 to satisfy 0.1 < (h1+h2) / H1 < 2, thereby facilitating the measurement and calculation of the relationship between the height of the reservoir 30 and the height of the oil storage tank 12.

[0063] Specifically, the connecting cover 13 is welded to the housing 10 and the liquid reservoir 30. To avoid the stress and other factors generated by welding the connecting cover 13 to the housing 10 from affecting the operation of the cylinder 20, h1 is not less than the distance from the center of the air inlet 21 of the cylinder 20 to the bottom of the cylinder 20.

[0064] Furthermore, the compressor 100 also includes a connecting pipe 50, one end of which extends into the liquid receiver 30, and the other end is connected to the air inlet 21 of the cylinder 20 to facilitate refrigerant delivery.

[0065] In one embodiment, the bottom side of the liquid reservoir 30 is provided with an exhaust port, and one end of the connecting pipe 50 extends out of the liquid reservoir 30 through the exhaust port and bends upward to increase the height of the air intake of the connecting pipe 50, so as to avoid the intake of liquid refrigerant.

[0066] In other embodiments, the exhaust port of the liquid reservoir 30 is located at the top of the side, that is, near the upper opening of the liquid reservoir 30, to increase the height of the air intake of the connecting pipe 50, so as to avoid the intake of liquid refrigerant.

[0067] Specifically, to facilitate the installation of the connecting pipe 50, the connecting pipe 50 includes a first pipe section 51 and a second pipe section 52. The first pipe section 51 is located inside the liquid reservoir 30. One end of the first pipe section 51 is bent toward the top of the liquid reservoir 30, and the other end is connected to the exhaust port and extends out of the exhaust port. One end of the second pipe section 52 is sleeved and connected to the extended part of the first pipe section 51, and the other end is connected to the air inlet 21 of the cylinder 20.

[0068] To ensure airtightness, a sealing treatment is applied to the gap between the vent of the reservoir 30 and the first pipe section 51.

[0069] Without loss of generality, in other embodiments, the first pipe section 51 and the second pipe section 52 may also be integrally formed, such as by casting or injection molding.

[0070] Furthermore, to improve the efficiency and reliability of the compressor 100, the first pipe section 51 is provided with an oil return hole 511 to facilitate the replenishment of lubricating oil carried away by circulation in the liquid receiver 30 to the oil reservoir 12. In one embodiment, the oil return hole 511 may be located above the first pipe section 51; in another embodiment, the oil return hole 511 may be located on the side of the first pipe.

[0071] To ensure good oil return performance, in one embodiment, the opening of the oil return hole 511 faces the bottom of the reservoir 30. Specifically, the oil return hole 511 is located on the first pipe section 51 near the air outlet 33.

[0072] Thus, without increasing the inner diameter of the housing 10 or the original height of the oil tank, the lubricating oil deposited at the bottom of the liquid reservoir 30 can enter the connecting pipe 50 through the oil return hole 511, be drawn into the oil reservoir inside the housing 10 by the cylinder 20, thereby replenishing the lubricating oil in the oil reservoir and effectively improving the heat exchange efficiency and energy efficiency index of the refrigeration cycle device. The liquid lubricating oil in the oil-gas mixture entering the liquid reservoir 30 falls to the bottom of the liquid reservoir 30 under the action of gravity, and can be returned to the oil reservoir through the oil return hole 511 on the connecting pipe 50, thereby realizing the circulation of lubricating oil in the oil reservoir and the liquid reservoir 30.

[0073] To ensure smooth oil return and avoid impacting the performance of compressor 100.

[0074] Reference Figure 5 and Figure 6 Furthermore, the equivalent diameter of the return oil hole 511 is d1 (equivalent diameter refers to the diameter of a circular pipe with equal hydraulic radius), and the equivalent diameter of the cross-section of the connecting pipe 50 is d2. The relationship between d1 and d2 satisfies: 0.1% < (d1). 2 / (d2) 2 )*100%≤1.5%.

[0075] To ensure a small amount of liquid return and avoid liquid slugging in the compressor, 0.1% ≤ (d1) 2 / (d2) 2 ≤1.5%.

[0076] The amount of oil returned to the compressor is directly reflected in the change of the exhaust temperature. Liquid return will cause ΔT to be smaller, (d1) 2 / (d2) 2 <0.1%, or, (d1) 2 / (d2) 2 If the value is greater than 1.5%, the ΔT will be too small. In addition to the decrease in compressor performance, it will also lead to a lower oil sump temperature, which will cause a decrease in the viscosity of the oil inside the compressor and insufficient lubrication of the friction pair, resulting in reliability risks.

[0077] Reference Figure 7 Furthermore, to ensure smooth oil return and compressor performance, the length of the oil return hole (511) is La, and the diameter of the oil return hole (511) is Lb. The length La and the diameter Lb satisfy the relationship: 0.5 <La / Lb≤4。

[0078] Based on the short-hole return flow rate CqAr(2▽P / ρ)1 / 2, where ▽P is the pressure difference between the inside and outside of the short hole, and Ar is the area of ​​the return oil hole 511, the actual return flow rate through the short hole can be calculated as: (d1) 2 / (d2) 2×Cq should be less than 1.5% × suction mass flow rate to ensure the performance of compressor 100 under slight liquid return. (d1) 2 / (d2) 2 A flow rate greater than ×Cq of 0.1% ensures smooth oil return. Therefore, the oil return hole 511 is set as a short hole to ensure the amount of oil returned and the smoothness of the oil return.

[0079] Reference Figure 1 and Figure 4 Furthermore, to ensure the oil return effect of the oil return hole 511 and avoid affecting the performance of the compressor 100, the effective volume of the liquid reservoir 30 component is V, and the volume between the height surface where the oil return hole 511 is located and the bottom of the liquid reservoir 30 is v, wherein v satisfies: 0.015V < v < 0.5V.

[0080] Effective volume V refers to the volume from the inlet of the first pipe section 511 near the connecting cover 13 to the bottom of the reservoir 30.

[0081] Combined with reference Figure 8 When v < 0.015V, that is, when v is too small, the liquid level is insufficient. When the system is running with liquid, it will cause the compressor 100 to return liquid, which poses a risk of liquid slugging and affects the performance of the compressor 100, that is, the performance degradation caused by liquid return.

[0082] Combined with reference Figure 9 When v > 0.5V, the oil storage volume is too large, which makes it difficult for oil to return through the oil return hole 511. After running for a period of time, the oil level in the oil storage tank drops, which further leads to insufficient lubrication of the friction pair and increased force.

[0083] Furthermore, when the compressor 100 is installed in the refrigeration equipment, the refrigerant charge of the refrigeration equipment is D, and the effective volume V of the liquid receiver 30 is related to D by the following condition: 0.5D < Vρ < D, the density of the liquid refrigerant is ρ, and the liquid receiver 30 is filled with more than 50% of the total refrigerant liquid to ensure maximum margin in the refrigerant deposition state. This improves the performance of the compressor 100.

[0084] Furthermore, to improve the performance of the compressor 100, the compressor 100 also includes a silencer 60, which is connected to the cylinder 20. The silencer 60 ensures the sealing of the high-pressure gas within the cylinder 20, guarantees the airtightness of the silencer chamber, and prevents high-pressure gas leakage, thereby improving the performance stability of the refrigeration compressor 100 and ultimately enhancing its overall performance.

[0085] Furthermore, the inner diameter of the housing 10 is d3, the volume formed between the parts above the upper end face of the cylinder 20 and below the upper end face of the upper muffler 60, and the outer perimeter of the housing 10 is v1, and the refrigerant charge of the air conditioner is D, satisfying:

[0086] [Π(h1+h2)×(d3) 2 / 4+v1] / [Π(h1+h2)×(d3) 2 [ / 4+v1+D]≥0.18

[0087] By ensuring the minimum sealing oil volume and the system refrigerant charge volume, the dilution requirements are met, thereby ensuring the reliability requirements of the pump body.

[0088] Without loss of generality, compressor 100 can be a single-cylinder compressor 100; of course, compressor 100 can also be a double-cylinder compressor 100. In the double-cylinder compressor 100 scheme, the relevant parameters (h1 / v1) are all measured at the position corresponding to the lower cylinder 20.

[0089] The present invention also proposes a refrigeration device, which includes a compressor 100. The specific structure of the compressor 100 is as described in the above embodiments. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0090] Refrigeration equipment can be categorized into compression refrigeration equipment, absorption refrigeration equipment, vapor jet refrigeration equipment, heat pump refrigeration equipment, and electric heating refrigeration devices. Refrigeration equipment mainly consists of a compressor, expansion valve, evaporator, condenser, accessories, and piping. Examples include refrigerators and air conditioners.

[0091] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A compressor, characterized in that, Comprising: A housing, an oil storage tank is formed at the bottom of the housing, and a connecting cover and the housing cooperate to form the oil storage tank; A cylinder, disposed within the housing, and an air inlet is provided on the housing and is in communication with the cylinder; A liquid reservoir, the liquid reservoir is disposed at the lower end or the upper end of the housing, an outlet of the liquid reservoir is connected to the cylinder via the air inlet, and the inner diameter of the housing is the same as the inner diameter of the liquid reservoir; the height of the liquid reservoir is H, and the maximum vertical distance from the center of the air inlet to the bottom of the oil storage tank is h, and the relationship between h and H satisfies: 0.1 < h / H < 2; and A connecting pipe, one end of the connecting pipe extends into the liquid reservoir, and the other end is connected to the air inlet for conveying refrigerant. Among them, the connecting pipe includes a first pipe section and a second pipe section connected to each other; The compressor further includes a muffler, and the muffler is connected to the cylinder; The center of the air inlet is the same as the center of the air inlet of the cylinder, the height of the housing from the center of the air inlet of the cylinder to the edge of the lower end opening is h1, the height from the lower end of the housing to the bottom of the connecting cover is h2, h = h1 + h2, the inner diameter of the housing is d3, and the volume enclosed between the upper end surface of the cylinder and the upper end surface of the muffler and the housing is v1, and the refrigerant charge of the refrigerant system is D, satisfying: [π(h1+h2)×(d3)] 2 / 4+v1] / [π(h1+h2)×(d3) 2 / 4+v1+D]≥0.

18.

2. The compressor as described in claim 1, characterized in that, The first pipe section is located within the liquid reservoir, one end of the first pipe section is bent towards the top of the liquid reservoir, and the other end of the first pipe section partially extends out of the liquid reservoir, and one end of the second pipe section is connected to the extended part of the first pipe section, and the other end of the second pipe section is connected to the air inlet.

3. The compressor as described in claim 2, characterized in that, The first pipe section and the second pipe section are integrally formed.

4. The compressor as described in claim 2, characterized in that, The first pipe section is provided with an oil return hole, and the opening direction of the oil return hole faces the bottom of the liquid reservoir.

5. The compressor as described in claim 4, characterized in that, The equivalent diameter of the oil return hole is d1, and the equivalent diameter of the connecting pipe is d2. The relationship between d1 and d2 satisfies: 0.1% < (d1) 2 / (d2) 2 ) * 100% ≤ 1.5%.

6. The compressor as described in claim 5, characterized in that, The length of the return oil hole is L. a The diameter of the return oil hole is L. b Hole length L a and aperture L b Relationship satisfied: 0.5 <L a / L b ≤4.

7. The compressor as described in claim 6, characterized in that, The effective volume of the liquid reservoir is V, and the volume between the height plane where the oil return hole is located and the bottom of the liquid reservoir is v, and the relationship between v and V satisfies: 0.015V < v < 0.5V.

8. A refrigeration device, characterized in that, Comprising the compressor according to any one of claims 1 to 7.

Images