A low-pulsation oil-injected scroll compressor stationary scroll disk and scroll compressor

Abstract

The present invention relates to the field of scroll compressors, specifically a low-pulsation oil-injected scroll compressor static scroll plate and a scroll compressor, wherein the oil injection mechanism includes a first oil injection channel and a second oil injection channel arranged inside the static scroll plate. The first oil injection channel is connected to a first oil injection hole and a second oil injection hole, and the openings are both arranged on the outside of the static scroll plate profile; the second oil injection channel is connected to a third oil injection hole and a fourth oil injection hole, and the openings are arranged on the inside of the static scroll plate profile. In the intake stage, when the first compression chamber and the second compression chamber are formed, oil injection cooling is started through the first oil injection hole and the fourth oil injection hole respectively; in the exhaust stage, before the first compression chamber and the second compression chamber are connected to the exhaust port, the second oil injection hole and the third oil injection hole are closed in sequence. The oil injection process covers the entire compression process of the gas, greatly improves the cooling efficiency of the compressed gas, reduces the vibration of the oil injection system, reduces the noise, and improves the stability of the oil injection system.

Description

Technical Field

[0001] The present invention relates to the technical field of scroll compressors, and in particular to a static scroll disk of a low-pulsation oil-injected scroll compressor and a scroll compressor. Background Art

[0002] A scroll compressor is a compressible volume compressor consisting of a fixed involute scroll and an eccentrically rotating, traversing involute scroll. Gas is drawn into the periphery of the stationary scroll. As the eccentric shaft rotates, the gas is gradually compressed within the crescent-shaped compression chambers formed by the meshing of the orbiting and stationary scrolls. Gas is then continuously discharged through the axial hole in the center of the stationary scroll.

[0003] In a helium scroll compressor, the helium generates a lot of heat after compression, and the compressor exhaust temperature is high, which causes carbonization of the lubricating oil and makes the compressor unable to operate stably.

[0004] In the prior art, a hermetic scroll compressor for helium, such as that disclosed in Patent No. CN201210148686.X, employs an oil injection port at the bottom of the fixed scroll and a slotted hole at its opening, with a length greater than the width of the orbiting scroll (i.e., L7 > t). This allows oil to be injected into both compression chambers for cooling. However, this structural design suffers from the following drawbacks: 1. A single oil injection port cannot be used in a symmetrical scroll design. In an asymmetric scroll, the maximum opening angle is 360°, making oil injection cooling impossible during the subsequent compression process. 2. Oil is already being injected into the outer chamber suction chamber at an angle θ5 before closing. Since the injected oil temperature is generally higher than the intake air temperature, this preheats the helium, which is detrimental to helium cooling and can also cause intake pressure pulsation. 3. Its main purpose is to balance the pressure difference between the two chambers through the fuel injection setting. However, while the pressure is balanced, there is a large difference in the fuel injection amount of the two chambers, which will lead to a large difference in the fuel injection amount of the two chambers.

[0005] For example, the oil-spray cooling structure for a sealed helium scroll compressor, patented with application number CN202410130686.X, features two oil-spraying holes, each connected to a compression chamber. During scroll operation, these holes are blocked by the passive spiral teeth, resulting in intermittent oil injection. This design, in actual use, constantly opens and closes the oil-spraying passageway. The pulsation created by the oil-spraying pressure is transmitted to the system piping, causing significant vibration and noise. Long-term use can also affect the strength of the piping system.

[0006] For example, an oil-injected scroll compressor stator and scroll compressor with patent number CN202310625628.X realizes oil-injection cooling of two compression chambers by setting two or more oil-injection structures. However, this structural setting has the following defects: 1. The orbiting scroll and the fixed scroll are in line contact when meshing. Slotting the side walls of the fixed scroll teeth will cause the fixed scroll and the orbiting scroll to be unable to mesh tightly, resulting in radial leakage of gas and reduced compression efficiency; 2. According to the setting of the first oil injection part 130 and the position setting of the holes 131 and 132, it can be seen that the hole 132 is set on the inner side of the fixed scroll profile line, and the hole 131 is set on the outer side of the fixed scroll profile line. It is inevitable that during the intake stage and before the compression chamber is formed, the holes 131 and 132 will already be spraying oil, causing suction pressure fluctuations; and the hole position is set close to the air inlet. The oil is sprayed at the air inlet before the compression chamber is closed. At this time, the oil injection temperature is higher than the intake temperature, causing the oil injection to preheat the gas, which is not conducive to the cooling of the compressed helium. 3. The presence of two or more oil inlet channels for the first and second oil injection sections 130 and 140 results in different injection pressures, requiring separate injection control, which complicates the process. 4. The presence of deep holes in the helical gear reduces its strength, posing a risk of breakage during long-term use. Furthermore, the small width of the helical gear makes deep holes difficult to machine, significantly increasing costs in practical applications.

[0007] Therefore, how to finely control the oil injection cooling of the scroll compressor to improve the cooling capacity while ensuring the stable operation of the compression equipment is an issue that technical personnel in this field need to consider. Summary of the Invention

[0008] The purpose of the present invention is to provide a low-pulsation oil-injection scroll compressor fixed scroll disk and a scroll compressor to solve the problems of large oil injection pulsation, poor compressed gas cooling effect and unbalanced cooling of each chamber in the prior art.

[0009] The technical solution of the present invention is: a low-pulsation oil-injection scroll compressor fixed scroll, the fixed scroll including an exhaust port and an oil injection mechanism, the orbiting scroll including an orbiting scroll tooth, the fixed scroll meshing with the orbiting scroll to form a first compression chamber and a second compression chamber, the oil injection mechanism including a first oil injection channel and a second oil injection channel provided inside the fixed scroll, the first oil injection channel and the second oil injection channel being connected to an oil inlet pipe at the same time;

[0010] The first oil injection channel is connected to the first oil injection hole and the second oil injection hole, and the openings of both are arranged on the outside of the fixed scroll profile; the second oil injection channel is connected to the third oil injection hole and the fourth oil injection hole, and the openings are arranged on the inside of the fixed scroll profile;

[0011] During the intake stage, the overlapping area of ​​the first and fourth oil injection holes with the movable spiral teeth gradually decreases, and the opening gradually increases, and they are connected with the first compression chamber and the second compression chamber respectively, and the connection area tends to increase; during the exhaust stage, the overlapping area of ​​the second and third oil injection holes with the movable spiral teeth gradually increases, and the opening gradually decreases, and they are closed with the first compression chamber and the second compression chamber respectively, and the closing area tends to increase.

[0012] Preferably, the first oil injection channel and the second oil inlet channel are arranged in a V shape, and the intersection is connected to the oil inlet pipe at the same time.

[0013] Preferably, the oil inlet pipe is connected to the side of the fixed scroll.

[0014] Preferably, the apertures of the first oil injection hole, the second oil injection hole, the third oil injection hole and the fourth oil injection hole are all the same and smaller than the width of the rotating tooth of the movable disc.

[0015] Preferably, the distances between the first and second oil injection holes and the outer wall of the fixed scroll tooth are greater than 0; the distances between the third and fourth oil injection holes and the inner wall of the fixed scroll tooth are greater than 0.

[0016] A scroll compressor uses a low-pulsation oil-injected scroll compressor fixed scroll disk.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] (1) During the intake phase, when the first and second compression chambers are formed, oil spray cooling begins through the first and fourth oil spray holes, respectively. During the exhaust phase, before the first and second compression chambers are connected to the exhaust port, the second and third oil spray holes are closed in sequence. The oil spray process covers the entire compression process of the gas, and oil spray cooling is continuously performed, greatly improving the cooling efficiency of the compressed gas.

[0019] In addition, before the compression chamber is formed, the oil is not injected or just injected, and after the compressed gas is exhausted, the gas is no longer cooled, which enables fine control of the oil injection cooling and optimizes the compression and cooling efficiency.

[0020] (2) The order of connecting and closing the four oil injection holes is as follows: the first oil injection hole and the fourth oil injection hole are opened first, that is, the first oil injection channel is connected to the first compression chamber, and the second oil injection channel is connected to the second compression chamber. Both compression chambers are in the initial stage, and the pressures borne by the two oil injection channels are basically the same. Therefore, the pressures of the two compression chambers are in a dynamic equilibrium state, avoiding pressure fluctuations; before the two are closed, the second oil injection hole and the third oil injection hole are opened in turn. That is, the first oil injection channel and the second oil injection channel are always in a state of oil flow, continuously spraying oil, increasing the cooling efficiency of the compressed gas; greatly reducing the pulsation of the injection pressure, thereby reducing the vibration of the injection system, reducing noise, and improving the stability of the injection system;

[0021] The two oil injection channels are cross-connected and connected to the oil inlet pipe at the same time, making the oil passage smoother, reducing flow resistance and further reducing pulsation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 Schematic diagram of the structure of the compression mechanism of the scroll compressor of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the oil injection mechanism of the present invention;

[0025] Figure 3 Schematic diagram of the structure of the fixed scroll disk of the present invention;

[0026] Figure 4-1 This is a structural diagram of the first compression chamber and the second compression chamber when they are formed during the intake phase of the present invention;

[0027] Figure 4-2 This is a schematic diagram of the structure of the compression stage of the present invention. Figure 1 ;

[0028] Figure 4-3 This is a schematic diagram of the structure of the compression stage of the present invention. Figure 2 ;

[0029] Figure 4-4 This is a structural diagram of the exhaust stage of the present invention when the second compression chamber is connected to the exhaust port;

[0030] Figure 4-5 This is a structural diagram of the exhaust stage of the present invention when the first compression chamber is connected to the exhaust port;

[0031] Figure 5 This is a schematic diagram of the oil injection hole opening at different angles of the orbiting scroll after the two compression chambers are closed according to the present invention.

[0032] Among them: movable scroll 1, movable scroll teeth 11;

[0033] The fixed scroll 2 has an air inlet 21, an air outlet 22, a fixed scroll tooth 23, a first compression chamber 24, and a second compression chamber 25;

[0034] The oil injection mechanism 3 , the first oil injection channel 31 , the first oil injection hole 311 , the second oil injection hole 312 , the second oil injection channel 32 , the third oil injection hole 321 , the fourth oil injection hole 322 , and the oil inlet pipe 33 . DETAILED DESCRIPTION

[0035] The present invention will be described in further detail below with reference to specific embodiments:

[0036] like Figure 1-Figure 3 As shown, the present invention is applied to a scroll compressor device for compressing gases such as helium. It includes an orbiting scroll 1 and a fixed scroll 2, and the fixed scroll 2 is provided with an air inlet 21 and an air outlet 22. When the compressor is working, the orbiting scroll 1 moves relative to the fixed scroll 2 to form a first compression chamber 24 and a second compression chamber 25. As the translation progresses, the volume of the first compression chamber 24 and the second compression chamber 25 becomes smaller, and the gas is gradually compressed. Finally, they are connected to the air outlet 22 in sequence to discharge the compressed gas. In this process, the relative meshing movement of the orbiting scroll 1 and the fixed scroll 2 generates heat. At the same time, the compressed gas also generates a large amount of heat, which causes the temperature of the compression mechanism and the gas to rise. Therefore, in this embodiment, a corresponding oil injection channel is provided on the fixed scroll 2. During the gas compression process, the compressed gas is continuously cooled to reduce the exhaust temperature, and the compression mechanism is cooled and lubricated.

[0037] Specifically:

[0038] The oil injection mechanism 3 includes a first oil injection channel 31 and a second oil injection channel 32 arranged inside the static vortex disk 2, and the first oil injection channel 31 and the second oil injection channel 32 are connected to the oil inlet pipe 33 at the same time. In this embodiment, the first oil injection channel 31 and the second oil injection channel 32 are arranged in a V shape, and the intersection is connected to the oil inlet pipe 33 at the same time. The oil inlet pipe 33 is connected to the side of the static vortex disk 2, so that the oil flow is smoother, the pipeline bends are reduced, and the flow resistance is reduced. In the preferred setting, the angle between the first oil injection channel 31 and the second oil injection channel 32 can be set as small as possible, which can further reduce the flow resistance of the oil. The diameters of the first oil injection channel 31 and the second oil injection channel 32 are the same.

[0039] The first oil injection channel 31 is connected to a first oil injection hole 311 and a second oil injection hole 312, while the second oil injection channel 32 is connected to a third oil injection hole 321 and a fourth oil injection hole 322. The four oil injection holes are arranged in the following order: first oil injection hole 311, second oil injection hole 312, fourth oil injection hole 322, and third oil injection hole 321, spirally inwardly of the fixed scroll 2. The openings of the third oil injection hole 321 and the fourth oil injection hole 322 are located on the inner side of the fixed scroll 2, while the openings of the first oil injection hole 311 and the second oil injection hole 312 are both located on the outer side of the fixed scroll 2.

[0040] In this embodiment, the apertures of the first oil injection hole 311, the second oil injection hole 312, the third oil injection hole 321 and the fourth oil injection hole 322 are all the same and smaller than the width of the movable disk tooth 11. It is preferably set to a hole diameter that is 0.1-0.3 mm smaller than the thickness of the movable disk tooth 11, so that when the movable scroll 1 moves horizontally, the movable disk tooth 11 can completely cover the oil injection hole, thereby avoiding the occurrence of air leakage between the first compression chamber 24 and the second compression chamber 25.

[0041] The distance between the first oil injection hole 311 and the second oil injection hole 312 and the outer wall of the static disk tooth 23 of the static vortex disk 2 is greater than 0; the distance between the third oil injection hole 321 and the fourth oil injection hole 322 and the inner wall of the static disk tooth 23 is greater than 0, and it is preferably set to that the distance between the edge of the hole and the outer wall of the static disk tooth 23 is 0.1-0.3mm, which can ensure that the holes can be completely covered during operation, and can also ensure that the first oil injection hole 311 and the fourth oil injection hole 322 are opened in time during the intake stage, and the second oil injection hole 312 and the third oil injection hole 321 are closed in time before exhaust.

[0042] It should be noted that the first and second compression chambers 24, 25 are formed at the inlet 21. As the orbiting scroll 1 translates, the two compression chambers shrink in volume and change position in the rotational direction until they connect with the exhaust port 22. This embodiment is based on the structure of a common symmetrical scroll compressor. During a compression cycle, during the intake phase, when the first and second compression chambers 24, 25 are formed, the first and second compression chambers 24, 25 formed in the previous compression cycle move to the vicinity of the exhaust port 22 and are not yet connected with the exhaust port 22. Therefore, four compression chambers coexist. The formation of the first and second compression chambers 24, 25 described in this embodiment refers to the formation of completely enclosed, independent chambers that are not connected to the inlet 21 or exhaust port 22 when the orbiting scroll 1 translates relative to the fixed scroll 2. For ease of explanation, this embodiment divides a compression cycle into the intake phase, the compression phase, and the exhaust phase. Furthermore, in some scroll compressor designs, the first and second compression chambers 24, 25 are not formed simultaneously; they are formed in a sequential order. When the two compression chambers are formed sequentially, the positions of the first and fourth injection holes 311 and 322 can be slightly adjusted to achieve simultaneous injection. However, the time between the two compression chambers is typically very short, and whether or not to perform sequential injection does not affect the injection effect. Therefore, this embodiment assumes that the first and second compression chambers 24 and 25 are formed simultaneously.

[0043] During the intake phase, the overlapping areas of the first and fourth oil injection holes 311 and 322 with the moving disk tooth 11 gradually decrease, while their openings gradually increase. They communicate with the first and second compression chambers 24 and 25, respectively, with the connection areas increasing. Specifically, the first oil injection hole 311 opens when the first compression chamber 24 is formed, and the fourth oil injection hole 322 opens when the second compression chamber 25 is formed. It should be noted that the first oil injection hole 311 can open before the first compression chamber 24 is formed, or after the first oil injection hole 311 has been partially opened. Similarly, the fourth oil injection hole 322 can open before the second compression chamber 25 is formed, or after the fourth oil injection hole 322 has been partially opened. The order in which the first oil injection hole 311 (or fourth oil injection hole 322) opens relative to the first compression chamber 24 (or second compression chamber 25) depends on the actual design of the compressor scroll. During the exhaust phase, the second oil injection hole 312 (or third oil injection hole 321) is gradually closing. That is, while the second oil injection hole 312 (or third oil injection hole 321) is gradually closing, the first oil injection hole 311 (or fourth oil injection hole 322) is gradually opening or has already fully opened. Therefore, the first oil injection channel 31 (or second oil injection channel 32) is always in a state of oil flow, continuously injecting oil, avoiding pulsation caused by intermittent oil flow and cessation.

[0044] During the exhaust phase, the overlapping areas of the second and third oil injection holes 312 and 321 with the rotating disc tooth 11 gradually increase, while their openings gradually decrease. They each tend to close with the first and second compression chambers 24 and 25, with the closed areas increasing. That is, before the first compression chamber 24 connects to the exhaust port 22, the second oil injection hole 312 is completely closed; and before the second compression chamber 25 connects to the exhaust port 22, the third oil injection hole 321 is completely closed.

[0045] In this embodiment, the specific injection process of the first injection hole 311, the second injection hole 312, the third injection hole 321 and the fourth injection hole 322 in one compression cycle is as follows:

[0046] 1. During the intake phase, if Figure 4-1 As shown, when the first compression chamber 24 and the second compression chamber 25 are formed, the first oil injection hole 311 and the fourth oil injection hole 322 partially cover or completely cover the end surface of the passive scroll 1, and are partially open or about to open; Figure 4-2 As shown, the orbiting scroll 1 continues to translate, and the openings of the first oil injection hole 311 and the fourth oil injection hole 322 increase until they are fully opened.

[0047] 2. In the compression stage, if Figure 4-2 and Figure 4-3 As shown, while the first oil injection hole 311 and the fourth oil injection hole 322 spray oil into the first compression chamber 24 and the second compression chamber 25 respectively, the second oil injection hole 312 and the third oil injection hole 321 begin to open to be fully opened, and also spray oil into the first compression chamber 24 and the second compression chamber 25 respectively.

[0048] 3. In the exhaust stage, if Figure 4-4 As shown, the second compression chamber 25 is first connected to the exhaust port 22, and the third oil injection hole 321 is completely closed before the connection; then, as shown in FIG. Figure 4-5 As shown, the first compression chamber 24 is communicated with the exhaust port 22, and the second oil injection hole 312 is completely closed before the communication.

[0049] In the above process, if Figure 4-1 、 Figure 4-2 and Figure 4-4 、 Figure 4-5 The intake phase and exhaust phase are overlapping processes. Figure 5The diagram shows the process from complete closure to exhaust for the first and second compression chambers 24 and 25 of a 390° translational compression device. Taking the first compression chamber 24 as an example, at 0°, it is completely closed, and the first oil injection hole 311 connected to the first compression chamber 24 is partially open. The following sequence occurs: the first oil injection hole 311 is fully open, the second oil injection hole 312 gradually begins to open until it is fully open, and the first oil injection hole 311 begins to close until it is completely closed. Finally, at 390°, the first compression chamber 24 is connected to the exhaust port 22 and no longer sprays oil. Similarly, the second compression chamber 25 is closed at 0°, and the fourth oil injection hole 322 begins to open. The following sequence occurs: the fourth oil injection hole 322 is fully open, the third oil injection hole 321 begins to open until it is fully open, and the fourth oil injection hole 322 begins to close until it is completely closed. Finally, at approximately 340°, the second compression chamber 25 is connected to the exhaust port 22 and no longer sprays oil. During this process, the continuity of oil flow reduces the pulsation of the oil system; at the same time, the oil injection process covers the entire process from intake to exhaust, greatly increasing the cooling efficiency.

[0050] It should also be noted that due to the positioning of the four oil injection holes, during the intake phase, even before the first compression chamber 24 (or second compression chamber 25) is formed, the first oil injection hole 311 (or fourth oil injection hole 322) begins injecting oil, resulting in a relatively small opening. Furthermore, due to the V-shaped design of the first and second oil injection passages, the first oil injection hole 311 (or fourth oil injection hole 322) is located away from the intake port. The duration of oil injection before the chambers are fully closed is extremely short, thus preventing preheating of the gas and having no impact on actual cooling efficiency.

[0051] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they are not intended to limit the scope of protection of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A low-pulsation oil-injected scroll compressor, comprising an orbiting scroll and a fixed scroll, the fixed scroll including an exhaust port and an oil injection mechanism, the orbiting scroll including an orbiting scroll tooth, the fixed scroll meshing with the orbiting scroll to form a first compression chamber and a second compression chamber, characterized in that: The oil injection mechanism includes a first oil injection channel and a second oil injection channel provided inside the fixed scroll, wherein the first oil injection channel and the second oil injection channel are connected to the oil inlet pipe at the same time; The first oil injection channel is connected to the first oil injection hole and the second oil injection hole, and the openings of both are arranged on the outside of the fixed scroll profile; the second oil injection channel is connected to the third oil injection hole and the fourth oil injection hole, and the openings are arranged on the inside of the fixed scroll profile; During the intake stage, the overlapping area of ​​the first and fourth oil injection holes with the movable spiral teeth gradually decreases, and the opening gradually increases, and they are connected with the first compression chamber and the second compression chamber respectively, and the connection area tends to increase; during the exhaust stage, the overlapping area of ​​the second and third oil injection holes with the movable spiral teeth gradually increases, and the opening gradually decreases, and they are closed with the first compression chamber and the second compression chamber respectively, and the closing area tends to increase.

2. A low pulsation oil-injected scroll compressor according to claim 1, characterized in that: The first oil injection channel and the second oil inlet channel are arranged in a V shape, and the intersection is communicated with the oil inlet pipe at the same time.

3. The low pulsation oil-injected scroll compressor according to claim 1, characterized in that: The oil inlet pipe is connected to the side of the fixed scroll.

4. The low pulsation oil-injected scroll compressor according to claim 1, characterized in that: The apertures of the first oil injection hole, the second oil injection hole, the third oil injection hole and the fourth oil injection hole are all the same and smaller than the width of the rotating tooth of the movable disk.

5. The low pulsation oil-injected scroll compressor according to claim 1, characterized in that: The distances between the first and second oil injection holes and the outer wall of the fixed scroll tooth of the fixed scroll are greater than 0; the distances between the third and fourth oil injection holes and the inner wall of the fixed scroll tooth are greater than 0.

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