Oil stabilizing cover structure and compressor

Abstract

The invention belongs to the technical field of compressors, and discloses an oil stabilizing cover structure and a compressor, the oil stabilizing cover structure comprises a filtering ring, an upper supporting frame and a lower supporting frame, a plurality of filtering holes are formed in the peripheral side surface of the filtering ring, the upper supporting frame is fixedly arranged at the upper end of the filtering ring, and the lower supporting frame is fixedly arranged at the lower end of the filtering ring; the compressor comprises the oil stabilizing cover structure and further comprises a main shell, a lower shell cover, a lower cylinder cover and a crankshaft, the lower cylinder cover, the main shell and the lower shell cover jointly form an oil pool, the lower cylinder cover is fixed to the main shell and located above the oil pool, the crankshaft penetrates through the lower cylinder cover and is immersed into lubricating oil in the oil pool, and the crankshaft is sleeved with the filter rings at intervals. The upper supporting frame is fixedly connected to the lower cylinder cover, and the lower supporting frame is fixedly connected to the lower shell cover. The oil stabilizing cover structure provided by the invention can effectively intercept refrigerant small bubbles in lubricating oil sucked by a crankshaft, stabilize the oil surface, can prevent excessive bubbles from entering an oil path to cause cavitation when being used for the compressor, and ensures that each friction pair of a pump body assembly of the compressor is reliably lubricated.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to an oil stabilizing cover structure and a compressor. Background Art

[0002] Under low temperature conditions, the refrigerant in a stationary air conditioning system will automatically migrate to the compressor cavity driven by the pressure difference, and fully mix with the lubricating oil in the oil pool, causing the oil pool liquid level to rise. As the temperature and pressure in the compressor cavity continue to rise, the dissolution between the lubricating oil and the refrigerant in the oil pool undergoes a physical process of stratification-atomization-boiling-single phase. At the beginning of the compressor startup, the pressure rises faster than the temperature, and the liquid refrigerant continues to dissolve in the oil pool and settles at the bottom, resulting in oil-poor and oil-rich layers, stratification of oil and liquid refrigerant, and low average viscosity of the oil pool. As the temperature of the oil pool continues to rise, the liquid refrigerant in the oil-poor layer vaporizes and floats up, while the refrigerant in the oil-rich layer continues to dissolve and form flow diffusion. The micronized bubbles become emulsified liquid bubbles under the rapid stirring of the crankshaft. This is the atomization stage. The bubbles stay in the oil pool for a long time and enter the oil circuit after being sucked into the crankshaft. Cavitation is prone to occur, and the oil content per unit pump liquid volume is reduced, affecting the lubrication condition of each friction pair of the pump body assembly. When the temperature of the oil pool further rises and reaches the critical point, the oil pool begins to enter the boiling stage, causing violent disturbances, and a large amount of refrigerant evaporates and entrains the lubricating oil to escape from the oil pool. The oil level drops sharply, resulting in unstable crankshaft pump oil, and there may be a short-term lack of oil pumping capacity.

[0003] In summary, when the compressor is cold-started, a large number of bubbles appear in the oil pool or the lubricating oil level in the oil pool is greatly disturbed, which will cause the lubricating oil content in the crankshaft unit pump fluid volume to decrease, increase the wear between the various components, and ultimately affect the reliability of the compressor. Summary of the invention

[0004] The object of the present invention is to provide an oil stabilizing cover structure which has a simple structure and can effectively intercept small bubbles of refrigerant in the lubricating oil sucked into the crankshaft and at the same time play a role in stabilizing the oil level.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An oil stabilizing cover structure, comprising:

[0007] A filter ring, wherein a plurality of filter holes are formed on the peripheral surface of the filter ring;

[0008] An upper support frame, along the axial direction of the filter ring, the upper support frame is fixedly arranged at the upper end of the filter ring, and the upper support frame is used to be fixedly connected to the lower cylinder head of the compressor;

[0009] A lower support frame is fixedly arranged at the lower end of the filter ring along the axial direction of the filter ring, and is used for being fixedly connected to the lower shell cover of the compressor.

[0010] Preferably, a first annular groove is formed on the lower end surface of the upper support frame, a second annular groove is formed on the upper end surface of the lower support frame, the upper end of the filter ring is fixed in the first annular groove, and the lower end of the filter ring is fixed in the second annular groove.

[0011] Preferably, the upper support frame and the lower support frame are both arranged in an annular shape, the upper support frame is provided with a through hole for the crankshaft of the compressor to pass through, and the upper support frame is provided with a fixing hole for fixed connection with the lower cylinder head.

[0012] Preferably, the number of the fixing holes is set to be multiple, for the locking device to pass through and be fixedly connected to the lower cylinder cover.

[0013] Preferably, the height of the lower support frame is h, and the depth of the refrigerant deposited in the oil pool when the compressor is stationary is b, then h and b satisfy: b+a≤h; wherein, 1mm≤a≤3mm.

[0014] Preferably, the pore size of the filter hole is d, and d satisfies: 0.1≤d+c≤0.25; wherein, 0.05≤c≤0.1.

[0015] Preferably, the number of filter rings is at least 1 layer, the first ring groove has at least 1 layer of ring grooves, the first ring groove is coaxially arranged with the upper support frame, the second ring groove has at least 1 layer of ring grooves, the second ring groove is coaxially arranged with the lower support frame, and the number of ring grooves of the first ring groove and the second ring groove is the same.

[0016] Preferably, the filter holes of the filter ring have the same or different pore sizes.

[0017] The present invention also provides a compressor, which uses the above-mentioned oil stabilizing cover structure, which can effectively intercept small refrigerant bubbles in the lubricating oil sucked into the crankshaft, avoid excessive bubbles entering the oil circuit after being sucked into the crankshaft and causing cavitation, thereby ensuring the effective supply of lubricating oil and avoiding affecting the lubrication conditions of the friction pairs of the compressor pump body assembly.

[0018] A compressor, comprising any of the above-mentioned oil stabilizing cover structures, further comprising a main housing, a lower housing cover, a lower cylinder cover and a crankshaft; wherein:

[0019] The lower shell cover is arranged below the main shell, the lower cylinder cover, the main shell and the lower shell cover together form an oil pool, the oil pool contains lubricating oil, the lower cylinder cover is located above the oil pool, and the crankshaft passes through the lower cylinder cover and is immersed in the lubricating oil in the oil pool;

[0020] The filter ring is sleeved at intervals on the outside of the crankshaft, the upper support frame is fixedly connected to the lower cylinder head, and the lower support frame is fixedly connected to the lower shell cover.

[0021] Preferably, the filter ring is arranged coaxially with the crankshaft.

[0022] Beneficial effects:

[0023] The oil stabilizing cover structure provided by the present invention is arranged in the oil pool of the compressor when in use. The oil stabilizing cover is immersed in the lubricating oil and can cover the through area of ​​the crankshaft short shaft immersed in the oil pool. The upper support frame is fixedly connected to the lower cylinder head, the lower support frame is fixedly connected to the lower shell cover, and the filter ring and the crankshaft are kept in a spaced sleeve state. When the compressor is working and the crankshaft rotates, the filter ring can effectively intercept small bubbles of refrigerant in the lubricating oil sucked into the crankshaft through its own filter holes, and the oil stabilizing cover can slow down the propagation of stirring force in the oil, thereby limiting the stirring range within the oil stabilizing structure, reducing the generation of exciting force, and keeping the local oil level of the crankshaft oil suction hole relatively stable.

[0024] The compressor provided by the present invention uses the above-mentioned oil stabilizing cover structure, which can effectively intercept small bubbles of refrigerant in the lubricating oil sucked by the crankshaft, prevent excessive bubbles from entering the oil circuit after being sucked by the crankshaft and causing cavitation, ensure the effective supply of lubricating oil, and avoid affecting the lubrication conditions of the friction pairs of the compressor pump body assembly. In addition, the lower support frame is connected to the lower shell cover of the compressor, which is a structure with a closed lower end surface, which can separate the refrigerant precipitated in the oil-poor area from the lubricating oil in the oil stabilizing cover, and improve the purity of the lubricating oil sucked by the crankshaft pump during cold start of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the oil stabilizing cover structure provided by the present invention;

[0026] Figure 2 It is a schematic structural diagram of the upper bracket provided by the present invention;

[0027] Figure 3 It is a structural schematic diagram of the lower bracket provided by the present invention;

[0028] Figure 4 It is a partial structural sectional view of the compressor provided by the present invention.

[0029] In the figure:

[0030] 1. Filter ring; 11. Filter hole;

[0031] 2. Upper support frame; 21. First ring groove; 22. Through hole; 23. Fixing hole;

[0032] 3. Lower support frame; 31. Second ring groove;

[0033] 4. Main shell;

[0034] 5. Lower shell cover;

[0035] 6. Lower cylinder head;

[0036] 7. Crankshaft;

[0037] 8. Oil pool. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] This embodiment provides a compressor. Figures 1 to 4As shown, the compressor includes a main housing 4, a lower housing cover 5, a lower cylinder head 6, a crankshaft 7, and also includes an oil stabilizing cover structure. Specifically, the oil stabilizing cover structure includes a filter ring 1, an upper support frame 2 and a lower support frame 3. Among them, the lower housing cover 5 is arranged below the main housing 4, and the lower cylinder head 6, the main housing 4 and the lower housing cover 5 together form an oil pool 8, and the oil pool 8 is filled with lubricating oil. The lower cylinder head 6 is located above the oil pool 8, and the crankshaft 7 passes through the lower cylinder head 6 and is immersed in the lubricating oil in the oil pool 8. A plurality of filter holes 11 are provided on the circumferential surface of the filter ring 1. The filter ring 1 is sleeved on the outside of the crankshaft 7 at intervals. Along the axial direction of the filter ring 1, the upper support frame 2 is fixedly arranged at the upper end of the filter ring 1, and the lower support frame 3 is fixedly arranged at the lower end of the filter ring 1. The upper support frame 2 is fixedly connected to the lower cylinder head 6, and the lower support frame 3 is fixedly connected to the lower housing cover 5.

[0043] In this embodiment, the oil stabilizing cover structure is arranged in the oil pool 8 of the compressor. The oil stabilizing cover is immersed in the lubricating oil and can cover the through area of ​​the short shaft of the crankshaft 7 immersed in the oil pool 8. The upper support frame 2 is fixedly connected to the lower cylinder head 6, the lower support frame 3 is fixedly connected to the lower shell cover 5, and the filter ring 1 and the crankshaft 7 are kept in a spaced sleeve state. When the compressor is working and the crankshaft 7 rotates, the filter ring 1 can effectively intercept the small bubbles of refrigerant in the lubricating oil sucked into the crankshaft 7 through its own filter holes 11, and the oil stabilizing cover can slow down the propagation of the stirring force in the oil, thereby limiting the stirring range within the oil stabilizing structure, reducing the generation of exciting force, and making the local oil level of the oil suction hole of the crankshaft 7 remain relatively stable.

[0044] In addition, the compressor uses the above-mentioned oil stabilizing cover structure, which can effectively intercept the small bubbles of refrigerant in the lubricating oil sucked by the crankshaft 7, prevent excessive bubbles from entering the oil circuit after being sucked by the crankshaft 7 and causing cavitation, ensure the effective supply of lubricating oil, and avoid affecting the lubrication condition of each friction pair of the compressor pump body assembly. In addition, the lower support frame 3 is connected to the lower shell cover 5 of the compressor, which is a structure with a closed lower end face, which can separate the refrigerant precipitated in the oil-poor area from the lubricating oil in the oil stabilizing cover, and improve the purity of the lubricating oil sucked by the crankshaft 7 pump during cold start of the compressor.

[0045] In this embodiment, the lower end surface of the upper support frame 2 is provided with a first annular groove 21, and the upper end surface of the lower support frame 3 is provided with a second annular groove 31. The upper end of the filter ring 1 is fixedly inserted in the first annular groove 21, and the lower end of the filter ring 1 is fixedly inserted in the second annular groove 31. The upper and lower ends of the filter ring 1 are respectively connected to the upper support frame 2 and the lower support frame 3 through the first annular groove 21 and the second annular groove 31, and the structure is simple and convenient. The upper end of the filter ring 1 is inserted into the first annular groove 21 by interference fit, and the lower end of the filter ring 1 is inserted into the second annular groove 31 by interference fit.

[0046] Optionally, the number of filter rings 1 is at least 1 layer, the first ring groove 21 has at least 1 layer of ring grooves, the first ring groove 21 is coaxially arranged with the upper support frame 2, the second ring groove 31 has at least 1 layer of ring grooves, the second ring groove 31 is coaxially arranged with the lower support frame 3, and the number of ring grooves of the first ring groove 21 and the second ring groove 31 is the same. Specifically, the number of layers of the filter ring 1 can be adaptively adjusted according to the requirements for interception of bubbles, and correspondingly, the number of layers of the first ring groove 21 and the second ring groove 31 can also be adaptively adjusted according to actual design needs to ensure that they can be plugged in with the corresponding number of layers of filter rings 1. Exemplarily, the first ring groove 21 and the second ring groove 31 are both provided with two layers. On this basis, one filter ring 1 can be installed or two filter rings 1 can be installed at the same time according to the state of the refrigerant bubbles. Exemplarily, the number of layers of the filter ring 1 and the density of the filter holes 11 can be freely combined to achieve effective interception of bubbles of different characteristic sizes dispersed in the oil pool 8, and most of the bubbles larger than the aperture of the filter holes 11 are blocked outside the filter ring 1, thereby reducing the risk of the crankshaft 7 inhaling bubbles.

[0047] In this embodiment, the upper support frame 2 and the lower support frame 3 are both arranged in an annular shape, the upper support frame 2 is provided with a through hole 22 for the crankshaft 7 to pass through, and the upper support frame 2 is provided with a fixing hole 23 for fixed connection with the lower cylinder head 6. Specifically, the through hole 22 is provided for the crankshaft 7 to pass through and be immersed in the lubricating oil in the oil pool 8 to avoid interference with the arrangement and rotation of the crankshaft 7. Arranging the upper support frame 2 and the lower support frame 3 in an annular shape can also be more suitable for the installation of the filter ring 1.

[0048] Further, the number of the fixing holes 23 is set to be multiple, for the locking device to pass through and be fixedly connected to the lower cylinder cover 6. Specifically, the upper support frame 2 and the lower cylinder cover 6 are fixedly connected by the locking device, and the locking device passes through the fixing holes 23 and is fixedly connected to the lower cylinder cover 6.

[0049] Optionally, the fixing hole 23 is set as a threaded hole. Optionally, the locking device is set as a bolt, and the lower cylinder cover 6 is correspondingly provided with a mounting hole, and the bolt passes through the mounting hole and is threadedly connected with the fixing hole 23, thereby realizing reliable fixation between the upper support frame 2 and the lower cylinder cover 6.

[0050] Optionally, the number of the fixing holes 23 is set to be multiple. In this embodiment, the number of the fixing holes 23 is set to four, ensuring the reliability and effectiveness of the fixing of the upper support frame 2.

[0051] In this embodiment, the pores 11 of the filter ring 1 have the same or different pore sizes. Optionally, the pore size of the filter pore 11 can be adaptively set according to the interception diameter requirement of the bubbles, and no further limitation is made here.

[0052] Exemplarily, when the filter ring 1 is multi-layered, the pores 11 of the filter rings 1 arranged from the outer layer to the inner layer can be set to have a larger pore size of the filter pores 11 of the outer layer filter ring 1 and a smaller pore size of the filter pores 11 of the inner layer filter ring 1. Exemplarily, when the filter ring 1 is single-layered, the pore sizes of the filter pores 11 of the filter ring 1 can be the same or different.

[0053] Furthermore, the number of layers of the filter ring 1 , the diameter of the filter holes 11 , and the density of the filter holes 11 can be freely combined.

[0054] In this embodiment, the height of the lower support frame 3 is h, and the depth of the refrigerant deposited in the oil pool 8 when the compressor is stationary is b, then h and b satisfy: b+a≤h; wherein 1mm≤a≤3mm. This arrangement can isolate the refrigerant deposited in the oil-poor area from the lubricating oil in the oil-stabilizing cover structure, so that the liquid pumped by the crankshaft 7 during cold start of the compressor is more pure lubricating oil, thereby improving the purity of the lubricating oil.

[0055] Optionally, the value of a can be set to 1mm, 1.5mm, 2mm, 2.5mm, or 3mm.

[0056] The filter holes 11 on the filter ring 1 can effectively reduce the content of bubbles entering the lubrication system, but it will inevitably cause an increase in the viscosity loss of the fluid, which is closely related to the aperture size of the filter hole 11. Obviously, if the aperture of the filter hole 11 is designed to be too small, the flow area is too small, and the oil suction resistance of the crankshaft 7 increases; if the aperture of the filter hole 11 is designed to be too large, it cannot play the role of blocking bubbles. Considering that the diameter of visible bubbles in the lubricating oil is generally between 0.25mm-0.5mm, in this embodiment, the aperture of the filter hole 11 is d, then d satisfies: 0.1≤d+c≤0.25; among which, 0.05mm≤c≤0.1mm.

[0057] Optionally, the value of c can be set to 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.1mm.

[0058] Furthermore, the amount of lubricating oil passing through the filter ring 1 per unit time Q a =S×v, It is related to the pump oil quantity Q of crankshaft 7 b The following conditions must be met: Q a ≥Q b To avoid the lubricating oil from being blocked or clogged when passing through the filter ring 1, and being unable to provide a continuous and sufficient amount of oil for the pumping of the crankshaft 7. Where S is the effective flow area of ​​the filter hole 11 of the filter ring 1; v is the average flow rate of the oil passing through the filter hole 11; ρ1 is the liquid density; ρ v is the gas density; K is the oil-gas separation constant, which is a function related to gas and liquid viscosity, air pressure and surface tension.

[0059] In this embodiment, the filter ring 1 is coaxially arranged with the crankshaft 7. This arrangement facilitates uniform force between the lubricating oil and the filter ring 1 during the rotation of the crankshaft 7, and avoids the filter ring 1 being closer to one side and farther away from the crankshaft 7, resulting in uneven stirring of the lubricating oil when the crankshaft 7 stirs the lubricating oil.

[0060] In this embodiment, the lower support frame 3 and the lower shell cover 5 are integrally formed. Such a configuration has a simple structure and is convenient for arrangement, and further eliminates the process of assembling the lower support frame 3 and the lower shell cover 5 separately, thereby achieving high installation efficiency. Optionally, the lower support frame 3 and the lower shell cover 5 can be fixedly connected by welding or bayonet locking.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An oil stabilizing cover structure, characterized in that: include: A filter ring (1), wherein a plurality of filter holes (11) are formed on a peripheral surface of the filter ring (1); An upper support frame (2), along the axial direction of the filter ring (1), the upper support frame (2) is fixedly arranged on the upper end of the filter ring (1), and the upper support frame (2) is used to be fixedly connected to the lower cylinder head (6) of the compressor; A lower support frame (3) is fixedly arranged at the lower end of the filter ring (1) along the axial direction of the filter ring (1), and the lower support frame (3) is used to be fixedly connected to the lower shell cover (5) of the compressor.

2. The oil stabilizing cover structure according to claim 1 is characterized in that: The lower end surface of the upper support frame (2) is provided with a first annular groove (21), the upper end surface of the lower support frame (3) is provided with a second annular groove (31), the upper end of the filter ring (1) is fixed in the first annular groove (21), and the lower end of the filter ring (1) is fixed in the second annular groove (31).

3. The oil stabilizing cover structure according to claim 1, characterized in that: The upper support frame (2) and the lower support frame (3) are both arranged in an annular shape; the upper support frame (2) is provided with a through hole (22) for the crankshaft (7) of the compressor to pass through; and the upper support frame (2) is provided with a fixing hole (23) for fixed connection with the lower cylinder head (6).

4. The oil stabilizing cover structure according to claim 3 is characterized in that: The number of the fixing holes (23) is set to be multiple, for the locking device to pass through and be fixedly connected to the lower cylinder cover (6).

5. The oil stabilizing cover structure according to claim 1, characterized in that: The height of the lower support frame (3) is h, and the depth of the refrigerant deposited in the oil pool (8) when the compressor is stationary is b, then h and b satisfy: b+a≤h; wherein 1mm≤a≤3mm.

6. The oil stabilizing cover structure according to claim 1, characterized in that: The pore size of the filter hole (11) is d, and d satisfies: 0.1≤d+c≤0.25; wherein, 0.05≤c≤0.

1.

7. The oil stabilizing cover structure according to claim 2, characterized in that: The number of the filter rings (1) is at least one layer, the first ring groove (21) is provided with at least one layer of ring grooves, the first ring groove (21) is coaxially arranged with the upper support frame (2), the second ring groove (31) is provided with at least one layer of ring grooves, the second ring groove (31) is coaxially arranged with the lower support frame (3), and the number of the first ring groove (21) and the second ring groove (31) is the same.

8. The oil stabilizing cover structure according to claim 1 or 7, characterized in that: The pore sizes of the filter holes (11) of the filter ring (1) are the same or different.

9. A compressor, characterized in that: The oil stabilizing cover structure comprises the oil stabilizing cover structure according to any one of claims 1 to 8, and further comprises a main housing (4), a lower housing cover (5), a lower cylinder cover (6) and a crankshaft (7); wherein: The lower shell cover (5) is arranged below the main shell (4); the lower cylinder cover (6), the main shell (4) and the lower shell cover (5) together form an oil pool (8); the oil pool (8) contains lubricating oil; the lower cylinder cover (6) is located above the oil pool (8); the crankshaft (7) passes through the lower cylinder cover (6) and is immersed in the lubricating oil in the oil pool (8); The filter ring (1) is sleeved at intervals on the outside of the crankshaft (7), the upper support frame (2) is fixedly connected to the lower cylinder head (6), and the lower support frame (3) is fixedly connected to the lower shell cover (5).

10. The compressor according to claim 9, characterized in that The filter ring (1) is arranged coaxially with the crankshaft (7).

Images