Leak-proof flammable refrigerant scroll compressor

Abstract

The invention provides an anti-leakage flammable refrigerant scroll compressor. According to the compressor, the connection modes of the upper cover, the shell, the lower cover, the upper support, the lower support, the air suction pipe, the exhaust pipe and the oil equalizing pipe are all changed into welding modes, and a connecting sleeve structure for preventing oil retention is arranged, so that leakage-free sealing of all key connection parts of the shell of the compressor is realized. And meanwhile, parameter control requirements of the welding penetration depth and the welding bead width are provided, forced ultrasonic flaw detection is carried out on the welding center seam of the shell rolled plate, and the welding strength reliability is remarkably improved. Compared with the prior art, thread sealing failure points are thoroughly eliminated, the problem of sealing failure caused by oil retention is completely eradicated, the flammable refrigerant leakage risk is fundamentally reduced, and the equipment safety is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of scroll compressors, and discloses a combustible refrigerant scroll compressor capable of reducing the risk of leakage. BACKGROUND

[0002] While HFCs are being phased out, the main paths to find their substitutes are mainly directed to two: one is the artificially synthesized hydrofluoroolefin (HFOs) and their mixtures, which have extremely low GWP and maintain high efficiency performance; the other is to return to natural working substances, such as propane (R290), carbon dioxide (R744) and ammonia (R717). These natural working substances not only have extremely low GWP (close to zero), but also usually have excellent thermodynamic performance. However, most of these environmentally friendly substitutes have an unavoidable characteristic - flammability (classified as A2L "micro-flammable" and A3 "highly flammable" levels). This becomes the biggest technical challenge and safety consideration in the promotion process.

[0003] For compressors, the risk of refrigerant leakage is mainly considered. At present, many equipment manufacturers still produce combustible refrigerant equipment according to the requirements for producing non-flammable refrigerant equipment, and there is no special consideration and verification for the welding part, which may cause refrigerant leakage due to poor welding of the compressor in the actual use process.

[0004] In view of the problems in the prior art, it is necessary to design a scroll compressor capable of reducing the risk of leakage to overcome the problems in the prior art. SUMMARY

[0005] In view of the technical problems of the combustible refrigerant scroll compressor proposed above that the refrigerant leaks due to poor welding or pipeline threaded connection, and causes the risk of combustion explosion, a full-welded sealing structure and a quantitative welding parameter system are provided. The two ends of the suction pipe, the exhaust pipe and the oil equalization pipe are connected by welding, the connection sleeve is provided to prevent oil accumulation, the precise welding parameters such as the penetration ratio and the weld width of the shell, the support and the pipeline are formulated, and the shell weld ultrasonic flaw detection process is introduced to eliminate the sealing hidden danger of the traditional threaded joint, improve the strength reliability of the weld, and eliminate the oil retention to cause the sealing failure, so that the compressor can significantly reduce the risk of leakage of the combustible refrigerant.

[0006] The technical means adopted by the present application are as follows:

[0007] A combustible refrigerant scroll compressor capable of preventing leakage comprises an upper cover, a shell, a lower cover, an upper support, a lower support, a suction pipe, an exhaust pipe, a connection sleeve and an oil equalization pipe. The two ends of the suction pipe and the exhaust pipe are connected with the shell and the unit pipeline by welding respectively; One end of the oil equalization pipe is welded to the shell through the connecting sleeve, and the other end is connected to the unit pipeline through welding; The welding penetration size of the shell and the upper cover is 2 / 3 to 4 / 5 of the thickness of the shell and is not fully penetrated, and the penetration size corresponds to a weld width of 3-4 times the weld width; The welding penetration size of the shell and the lower cover is 1 / 3 of the thickness of the lower cover, and the penetration size is the same as the penetration size. After the shell is formed by plate welding, the ultrasonic flaw detection is performed on the welding center joint.

[0008] The technical solution changes the connection mode of the key pipeline (suction pipe, exhaust pipe, oil equalization pipe) of the compressor and the unit pipeline from the traditional threaded connection to the full welding form, solves the risk of refrigerant leakage caused by the insufficient sealing of the threaded connection, and improves the weld strength through standardized welding parameters (such as penetration ratio and weld width), and eliminates the potential risks of the shell plate welding center joint. Eliminate the leakage point of threaded connection, reduce the risk of flammable refrigerant leakage; the weld width is 3-4 times the weld width, and the penetration reaches 2 / 3 of the shell thickness, which ensures that the weld strength meets the leakage prevention requirements; ultrasonic flaw detection ensures that the shell center joint has no welding defects, preventing refrigerant leakage caused by center joint cracking.

[0009] Further, The connecting sleeve comprises: The boss structure matched with the shell has a height less than the thickness of the shell but matches the penetration of the welding of the shell; The groove structure matched with the oil equalization pipe has a through hole size less than the inner hole size of the oil equalization pipe to prevent oil accumulation in the pipeline.

[0010] The technical solution optimizes the connection of the oil equalization pipe and the shell through the boss and groove structure of the connecting sleeve to prevent sealing failure caused by oil accumulation in the refrigerant system. The boss height is less than the shell thickness and the through hole size is less than the inner hole of the oil equalization pipe, avoiding oil residue in the pipeline; the structural design takes into account the welding strength and fluid resistance optimization to improve the pipeline sealing reliability.

[0011] Further, the brazing depth of the shell and the suction pipe reaches more than 2 / 3 of the gap fit length therebetween; and the brazing depth of the exhaust pipe and the upper cover reaches more than 2 / 3 of the gap fit length therebetween.

[0012] The technical solution precisely controls the brazing depth of the suction pipe and the exhaust pipe (more than 2 / 3 of the gap fit length) to ensure the welding strength of the pipeline and the shell, while avoiding sealing failure caused by insufficient brazing. The brazing depth parameter is verified by tests to have a large margin while ensuring the welding strength, which is better than the traditional brazing process; reduces refrigerant leakage caused by insufficient brazing, and improves overall safety.

[0013] Further, the welding of the shell and the upper support or the lower support satisfies: The depth of the welding penetration into the shell and the melting into the support; The diameter of the fusion zone is not less than 10 times the depth.

[0014] This technical solution: by controlling the welding penetration and the fusion diameter (G≥10F) of the support structure (upper support, lower support), it ensures the high-strength connection of the support and the shell, preventing structural failure caused by vibration or pressure. The welding penetration into the shell and the melting into the support ensure a firm connection node; the fusion diameter multiple standard (G≥10F) makes the stress distribution uniform, prolonging the service life of the compressor.

[0015] Further, The upper cover and the lower cover are molded components without welding processing, avoiding refrigerant leakage caused by welding.

[0016] This technical solution uses a molding process to manufacture the upper and lower covers, avoiding micro-defects or leakage paths caused by welding processes. The seamless structure of the molding eliminates the risk of refrigerant leakage caused by welding joints; it improves the integrity of the key sealing components and meets the safety requirements of flammable refrigerant equipment.

[0017] Further, the ultrasonic flaw detection standard of the welding center joint of the shell includes: The length of non-penetrating defects is not more than 5% of the total length of the weld; Non-continuous welding areas need to be re-detected after rework until they are qualified.

[0018] This technical solution systematically controls the shell welding quality by standardizing the ultrasonic flaw detection standard (such as rework of non-continuous welding areas until they are qualified), ensuring that each compressor meets the anti-leakage design requirements. The mandatory detection process eliminates welding process defects, effectively reducing leaks caused by operational errors; it improves production consistency and reduces refrigerant leakage in batch equipment.

[0019] Compared with the prior art, the present application has the following advantages: 1. The suction pipe, the exhaust pipe, and the oil equalization pipe need to be connected with the unit pipeline during use. This design determines the connection method as welding, which reduces the risk of leakage at the threaded connection compared to the existing threaded connection. The strength is sufficient and has a large margin after testing.

[0020] 2. In the present application, the shell is formed by plate rolling and welding, and the welding center joint is subjected to ultrasonic flaw detection, and is used after being qualified. The existing shell production does not have detection requirements for the welds. In the present application, the parts prone to leakage are considered comprehensively, and detection items are added to improve safety.

[0021] 3. The welding requirements of all welding positions of the compressor shell are proposed by the application, which are verified by calculation and test, and the execution according to the requirements can greatly reduce the risk of welding leakage, and provide a judgment basis for the setting of welding parameters. The existing models do not have such detailed requirements for welding positions.

[0022] In summary, the technical scheme of the application solves the problem of refrigerant leakage caused by poor welding or pipeline threaded connection of the flammable refrigerant scroll compressor, reduces the risk of combustion explosion, and improves safety. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 The structure of the application is shown in the figure; Figure 2 The welding size requirement diagram of the upper cover and the shell of the application is shown in the figure; Figure 3 The welding size requirement diagram of the lower cover and the shell of the application is shown in the figure; Figure 4 The welding size requirement diagram of the upper support and the shell of the application is shown in the figure; Figure 5 The welding size requirement diagram of the lower support and the shell of the application is shown in the figure; Figure 6 The welding size requirement diagram of the exhaust pipe and the upper cover of the application is shown in the figure; Figure 7 The welding size requirement diagram of the suction pipe and the shell of the application is shown in the figure; Figure 8 The welding size requirement diagram of the connecting sleeve and the shell, and the oil equalizing pipe and the connecting sleeve of the application is shown in the figure.

[0025] In the figure: 11, upper cover 12, shell 13, lower cover 14, upper support 15, lower support 16, exhaust pipe 17, suction pipe 18, connecting sleeve 19, oil equalizing pipe. DETAILED DESCRIPTION

[0026] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one example embodiment is merely illustrative in nature and is in no way limiting on the application or its applications or uses. Based upon a review of the embodiments contained herein, all other embodiments that are apparent to those of ordinary skill in the art, and to practitioners thereof, in which equal or substantially equivalent results are achieved, belong within the scope of the present application.

[0028] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0029] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specifically stated. It should be apparent that the dimensions of the various parts shown in the drawings are not to scale and are only meant to illustrate the general principles of the application. Techniques, methods, and apparatus known to those of ordinary skill are not discussed in detail because they would be apparent in light of the teachings herein. All examples shown and discussed herein are intended to be illustrative of the application and not limiting thereof. Thus, other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters in the various figures indicate like elements, and therefore, further discussion of the same will not be repeated in the subsequent figures.

[0030] In the description of the present application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and in the absence of contrary description, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0031] For the purposes of this description, spatially relative terms such as "above", "below", "up", "down", "top", "bottom", "lateral", "longitudinal" (or lengthwise), and the like, can be used herein for ease of description to describe one element's or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The terms "first", "second", "third", etc. can be used herein to describe various components, but do not necessarily have a special meaning or connotation, unless otherwise stated.

[0032] In addition, it should be noted that the use of "first", "second", etc. words to define parts, only for the convenience of the corresponding parts, as there is no declaration, the above words have no special meaning, therefore can not be understood as limiting the scope of protection of the present application.

[0033] As Figure 1 A kind of anti-leakage combustible refrigerant scroll compressor, including welding requirement of possible leakage risk site, all pipeline connected with unit adopts welding form.

[0034] Further, the welding requirement corresponding part includes upper cover 11, shell 12, lower cover 13, upper support 14, lower support 15, exhaust pipe 16, suction pipe 17, connecting sleeve 18 and oil equalization pipe 19.The connection of compressor shell parts is all selected welding type, and the size requirement of welding position is proposed; Suction pipe 17 is welded with shell 12 at one end, and the other end is connected with unit pipeline in welding mode; Oil equalization pipe 19 is welded with shell 12 at one end through connecting sleeve 18, and the other end is connected with unit pipeline in welding mode; Shell 12 is formed by plate welding, and the weld joint needs to be detected by ultrasonic flaw detection; Oil equalization pipe 19 is brazed with connecting sleeve 18, and is connected with unit pipeline in welding mode; Further, connecting sleeve 18 acts as a connection between oil equalization pipe 19 and shell 12, one end of the boss cooperates with the hole of the shell, the other end of the groove cooperates with the oil equalization pipe 19, the boss height is less than the thickness of the shell 12, the groove depth is determined according to the penetration requirement, the boss position through hole size ΦS is less than the inner hole size ΦR of the oil equalization pipe 19, to prevent oil storage in the pipeline, see Figure 8 ​Further, the welding requirement between the shell 12 and the upper cover 11 is that the welding width A needs to reach three to four times of the welding width C, the penetration size B is more than two-thirds of the shell thickness, but the shell is not allowed to be penetrated, see Figure 2 ; Further, the welding requirement between the shell 12 and the lower cover 14 is that the penetration size D at the lower cover needs to reach one-third of the lower cover thickness, and the penetration size E at the shell is the same as the size D, see Figure 3 ; Further, the welding requirement between the shell 12 and the upper support 14 is that the welding spot penetrates the shell, melts into the upper support with a depth F, and the fusion diameter G reaches more than ten times of F, see Figure 4 ; Further, the welding requirement between the shell 12 and the lower support 15 is that the welding spot penetrates the shell, melts into the lower support with a depth F, and the fusion diameter G reaches more than ten times of F, see Figure 5 ; Further, the welding requirement between the upper cover 11 and the exhaust pipe 16 is that the brazing depth size H reaches more than two-thirds of the gap length size J between the upper cover and the exhaust pipe, see Figure 6 ; Further, the welding requirement between the shell 12 and the air suction pipe 17 is that the brazing depth size K reaches more than two-thirds of the gap length size L between the shell and the air suction pipe, see Figure 7 ; Further, the welding requirement between the shell 12 and the connecting sleeve 18 is that the penetration size M at the shell is more than one-half of the shell thickness, but the shell is not allowed to be penetrated, and the penetration size N at the connecting sleeve is the same as the size M, see Figure 8 ; Further, the welding requirement between the connecting sleeve 18 and the oil equalizing pipe 19 is that the brazing depth size P reaches more than one-half of the gap length size Q between the connecting sleeve and the oil equalizing pipe, see Figure 8 ; Further, the upper cover 11 is molded without welding processing, and there is no risk of leakage.

[0035] Further, the lower cover 13 is molded without welding processing, and there is no risk of leakage.

[0036] Further, the shell 12 is formed by plate welding, and the welding joint needs to be detected by ultrasonic flaw detection, and is used after being qualified.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A combustible refrigerant scroll compressor with leakage prevention, characterized in that: it comprises an upper cover (11), a shell (12), a lower cover (13), an upper support (14), a lower support (15), a suction pipe (17), a discharge pipe (16), a connecting sleeve (18) and an oil equalization pipe (19), wherein: the two ends of the suction pipe (17) and the discharge pipe (16) are connected with the shell (12) and the unit pipeline respectively by welding; one end of the oil equalization pipe (19) is welded with the shell (12) through the connecting sleeve (18), and the other end is connected with the unit pipeline by welding; the welding penetration size (B) of the shell (12) and the upper cover (11) is 2 / 3 to 4 / 5 of the thickness of the shell (12) and is not fully penetrated, and the penetration size (B) corresponds to the weld width (A) which is 3-4 times of the weld width (C); the welding penetration size (D) of the shell (12) and the lower cover (13) is 1 / 3 of the thickness of the lower cover (13), and the penetration size (E) is the same as the penetration size (D); after the shell (12) is formed by plate rolling welding, the welding joint is detected by ultrasonic flaw detection.

2. The combustible refrigerant scroll compressor with leakage prevention according to claim 1, characterized in that: the connecting sleeve (18) comprises: a boss structure matched with the shell (12), the height of which is less than the thickness of the shell (12) but matches the penetration of the welding with the shell (12); a groove structure matched with the oil equalization pipe (19), the through hole size (ΦS) of the boss is smaller than the inner hole size (ΦR) of the oil equalization pipe (19) to prevent oil accumulation in the pipeline.

3. The combustible refrigerant scroll compressor with leakage prevention according to claim 1, characterized in that: the brazing depth (K) of the shell (12) and the suction pipe (17) reaches more than 2 / 3 of the gap matching length (L) between them; the brazing depth (H) of the discharge pipe (16) and the upper cover (11) reaches more than 2 / 3 of the gap matching length (J) between them.

4. The combustible refrigerant scroll compressor with leakage prevention according to claim 1, characterized in that: the welding of the shell (12) and the upper support (14) or the lower support (15) satisfies: the welding spot penetrates the shell (12) and melts into the support with a depth (F); the fusion zone diameter (G) is not less than 10 times of the depth (F).

5. The combustible refrigerant scroll compressor with leakage prevention according to claim 1, characterized in that: the upper cover (11) and the lower cover (13) are molded components and are not subjected to welding processing to avoid refrigerant leakage caused by welding.

6. The combustible refrigerant scroll compressor with leakage prevention according to claim 1, characterized in that: the ultrasonic flaw detection standard of the welding joint of the shell (12) comprises: the length of non-penetrating defects is not more than 5% of the total length of the weld; non-continuous welding area needs to be re-detected after rework until it is qualified.

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