Compressor seal structure and compressor
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
- Filing Date
- 2025-05-15
- Publication Date
- 2026-06-02
Smart Images
Figure CN224315161U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of compressors, specifically to a compressor sealing structure and a compressor. Background Technology
[0002] In the structural design of rotary compressors, to improve compressor performance, the exhaust port in the cylinder head is typically moved inward towards the cylinder center. This increases the projected area of the exhaust port within the cylinder and reduces the volume of the matching exhaust bevel (DV port), thereby reducing clearance volume and exhaust resistance losses. However, when the inward movement of the exhaust port exceeds the minimum sealing distance of the piston, the exhaust port will connect the inner and outer chambers of the piston, causing refrigerant leakage. When this occurs, there are generally two solutions: one is to thicken the piston, but this is limited by the compressor displacement, crankshaft diameter, and eccentricity, which will affect the shaft balance; the other is to reduce or move the exhaust port outward, but this will result in losses in clearance volume and exhaust resistance.
[0003] To avoid insufficient minimum sealing distance between the exhaust port and the inner circle of the piston during compressor structural design, the influence of the exhaust port diameter and position on clearance volume and exhaust resistance loss must be comprehensively considered, which greatly limits the design space of the exhaust port.
[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content
[0005] To address the problems in the prior art, the purpose of this utility model is to provide a compressor sealing structure and a compressor, wherein the cylinder head exhaust port of the sealing structure at least partially overlaps with the blade groove, thereby reducing the effect of the blade groove covering the exhaust port, which reduces its effective flow area and the increase in refrigerant exhaust resistance caused by the piston covering the exhaust port in advance, thus improving the efficiency of the compressor.
[0006] Specifically, the first aspect of this utility model provides a compressor sealing structure, including a crankshaft, an upper cylinder head, a lower cylinder head, a cylinder, and a piston;
[0007] At least one of the upper cylinder head and the lower cylinder head is provided with an exhaust port;
[0008] The crankshaft includes at least an eccentric portion, and an extension section is provided on the outer periphery of one end face of the eccentric portion that abuts against the upper cylinder head or the lower cylinder head where the exhaust port is provided.
[0009] The upper cylinder head and the lower cylinder head are respectively fixed to the two axial ends of the cylinder and form a cylinder cavity;
[0010] The cylinder is provided with a blade groove that communicates with the cylinder cavity, and blades are provided in the blade groove;
[0011] The piston is sleeved on the eccentric part, and the eccentric part of the piston and the crankshaft is disposed in the cylinder cavity. The end face of the protruding section and the end face of the piston form a continuous surface.
[0012] The projection of the exhaust port onto a plane perpendicular to the crankshaft axis at least partially coincides with the projection of the blade onto a plane perpendicular to the crankshaft axis.
[0013] According to a first aspect of the present invention, the area of the exhaust port is S;
[0014] The area of the portion where the projection of the exhaust port on the plane perpendicular to the crankshaft axis coincides with the projection of the blade on the plane perpendicular to the crankshaft axis is S0, which satisfies: S0≤0.05*S.
[0015] According to a first aspect of the present invention, the width of the blade is d;
[0016] The minimum vertical distance between the edge of the exhaust hole covering the blade and the blade is the minimum sealing distance a of the blade, which satisfies: a≥2*d / 3.
[0017] According to a first aspect of the present invention, the blade groove on the inner wall of the cylinder is provided with a chamfer, and the chamfer intersects with the inner wall of the cylinder at a point.
[0018] According to a first aspect of the present invention, the inner wall of the cylinder is provided with a beveled cut;
[0019] The oblique cut is located at the chamfer of the blade groove at one end, and does not coincide with the intersection point.
[0020] According to a first aspect of the present invention, the minimum sealing distance δ is the difference between the minimum vertical distance between the exhaust port and the crankshaft axis and the vertical distance between the inner edge of the protruding section and the crankshaft axis along the radial direction of the compressor, satisfying: δ≥0.5mm.
[0021] According to a first aspect of the present invention, the perpendicular distance R between the inner edge of the protruding section in the crankshaft radial direction and the crankshaft axis satisfies:
[0022] R1 <R≤L-r-δ;
[0023] in:
[0024] R1 is the outer diameter of the thrust portion of the eccentric part;
[0025] r is the radius of the vent hole;
[0026] L is the vertical distance from the center of the exhaust port to the axis of the crankshaft;
[0027] δ represents the minimum perpendicular distance between the exhaust port and the crankshaft axis, and the distance between the inner edge of the protruding section and the crankshaft axis.
[0028] The difference between the perpendicular distances between the axes.
[0029] The second aspect of this utility model provides a compressor, including the compressor sealing structure described in the first aspect.
[0030] The compressor sealing structure of this invention features a cylinder head exhaust port and blade groove whose projections on a plane perpendicular to the crankshaft axis at least partially coincide with the projections of the blades (blade grooves) on a plane perpendicular to the crankshaft axis. This reduces the impact of the blade grooves covering the exhaust port, thus decreasing its effective flow area and the refrigerant exhaust resistance caused by the piston prematurely covering the exhaust port, thereby improving compressor efficiency. At the same time, it can reduce the volume of the cylinder bevel cut that matches the exhaust port, thereby reducing clearance volume while improving exhaust smoothness. Attached Figure Description
[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. It is obvious that the drawings described below are merely some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings without inventive effort. Furthermore, the drawings are merely illustrative diagrams of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore, repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.
[0032] Figure 1 This is a cross-sectional view of the compressor sealing structure at the cylinder according to an embodiment of the present invention;
[0033] Figure 2 This is a partial cross-sectional view of a crankshaft according to an embodiment of the present invention;
[0034] Figure 3 This is a projection diagram showing the relationship between the cylinder head exhaust port and the blades of a compressor sealing structure according to an embodiment of the present invention.
[0035] Figure 4 This is a cross-sectional view of the oblique cut and blade groove of a cylinder according to an embodiment of the present invention. Detailed Implementation
[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed herein. This utility model can also be implemented or applied through other different specific embodiments. Various details in this utility model can also be modified or changed according to different viewpoints and application systems without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.
[0037] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement it. This utility model can be embodied in many different forms and is not limited to the embodiments described herein.
[0038] In the representation of this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this utility model, as well as features of different embodiments or examples.
[0039] To clearly illustrate this utility model, components unrelated to the description are omitted, and the same or similar constituent elements throughout the specification are given the same reference numerals.
[0040] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.
[0041] When we say that a device is "above" another device, this can mean that it is directly above the other device, or it can mean that other devices are present in between. Conversely, when we say that a device is "directly" "above" another device, there are no other devices present in between.
[0042] Although the terms first, second, etc., are used in some instances herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.
[0043] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of the invention. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in this specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.
[0044] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with relevant technical documents and the content of this present instruction, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.
[0045] The compressor sealing structure and compressor of this utility model are further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of this utility model.
[0046] This utility model provides a compressor sealing structure. Figure 1 This is a cross-sectional view of the compressor sealing structure at the cylinder according to an embodiment of the present invention. Specifically, the sealing structure includes a crankshaft, an upper cylinder head, a lower cylinder head (not shown in the figure), a cylinder, and a piston 3. The upper cylinder head and the lower cylinder head are fixed to the axial ends of the cylinder 2 and form a cylinder cavity.
[0047] Figure 2This is a partial cross-sectional view of a crankshaft according to an embodiment of the present invention. Typically, the crankshaft 1 includes a long shaft (not fully shown in the figure), an eccentric portion 11, and a short shaft 12 connected in sequence. The present invention focuses on the sealing between the eccentric portion of the crankshaft, the piston, and the upper or lower cylinder head. The piston 3 is fitted onto the eccentric portion 11 of the crankshaft, and the piston 3 and the eccentric portion 11 of the crankshaft 1 are disposed within the cylinder cavity. The area enclosed by the piston 3 and the eccentric portion 11 is the piston inner cavity; the area enclosed by the piston 3 and the inner wall of the cylinder 2 is the piston outer cavity.
[0048] At least one of the upper and lower cylinder heads of this invention is provided with an exhaust port; an extension section 112 is provided on the outer periphery of one end face of the eccentric portion that abuts against the upper and / or lower cylinder head with the exhaust port. Alternatively, a thrust portion 111 may be provided on the end face of the eccentric portion 11 with the extension section 112, the thrust portion 111 being used for clearance fit with the cylinder head to prevent axial movement of the crankshaft 1. For example, when the upper cylinder head is provided with an exhaust port, an extension section is provided on the outer periphery of one end face of the eccentric portion that abuts against the upper cylinder head, i.e., the exhaust port and the extension section 112 are located on the same side of the cylinder, in which case the compressor is top-exhaust; when the lower cylinder head is provided with an exhaust port, an extension section is provided on the outer periphery of one end of the eccentric portion that abuts against the lower cylinder head, in which case the compressor is bottom-exhaust. Of course, the compressor can be top-exhaust or bottom-exhaust, or it can have both top-exhaust and bottom-exhaust simultaneously. The following text does not distinguish between the upper and lower cylinder heads.
[0049] The cylinder is provided with a vane groove 21, and a vane 22 is provided in the vane groove 21. The vane 22 is pushed by a vane spring to reciprocate in the vane groove 21, that is, to push the tip of the vane to contact the rolling piston. In this utility model, the vane 22 fits into the vane groove 21, so the width of the two is the same. In the extension direction of the vane groove 21 in the cylinder 2, the part of the exhaust port that is blocked is the vane 22. The vane groove itself cannot play a role in blocking the exhaust port. Therefore, the vane is introduced here for clearer description.
[0050] The end face of the extended section 112 of the eccentric part 11 and the end face of the piston 3 form a continuous surface. When the crankshaft 1 rotates, the continuous surface runs to the exhaust port. The continuous surface covers the projection K of the exhaust port of the cylinder head on the end face. That is, the end face of the extended section 112 of the crankshaft 1 serves as an extension of the sealing end face of the piston 3 to jointly achieve the sealing between the inner cavity of the piston and the outer cavity of the piston when the crankshaft rotates.
[0051] Figure 3 This is a projection diagram of the cylinder head exhaust port and blades of a compressor sealing structure according to an embodiment of the present invention. In this invention, the projection K of the exhaust port on a plane perpendicular to the crankshaft axis coincides at least partially with the projection of the blade 22 (the extension of the blade groove 21 in the cylinder 2) on a plane perpendicular to the crankshaft axis.
[0052] Further, the radius of the exhaust hole is r, and the area S of its projection K is πr 2 , and the area of the overlapping part of the projection K of the exhaust hole on the plane perpendicular to the crankshaft axis and the projection of the blade 22 on the plane perpendicular to the crankshaft axis is S0. S0 is the area blocked by the blade of the exhaust hole, and it satisfies: S0 ≤ 0.05 * S.
[0053] At the same time, define the width of the blade 22 as d, and the minimum vertical distance between the edge of the exhaust hole covering the blade and the blade is the minimum sealing distance a of the blade, which satisfies: a ≥ 2 * d / 3. The structural settings of the above exhaust hole and the blade (blade groove) are on the one hand to prevent the blade from overly blocking the exhaust hole, reducing the projected area of the exhaust hole inside the cylinder and causing a reduction in the effective flow area of the exhaust hole; on the other hand, it can reduce the influence of the increase in exhaust resistance caused by the premature starting angle of the piston covering the exhaust hole after the exhaust hole moves inwards.
[0054] In some embodiments, in the radial direction of the compressor, the difference between the minimum vertical distance between the exhaust hole and the crankshaft axis and the vertical distance between the inner edge of the extension section 112 and the crankshaft axis is the minimum sealing distance δ, which satisfies: δ ≥ 0.5 mm. The vertical distance between the inner edge of the extension section 112 in the radial direction of the crankshaft and the crankshaft axis is R, which satisfies: R1 < R ≤ L - r - δ, where R1 is the outer diameter of the thrust part 111 of the eccentric part, r is the radius of the exhaust hole, and L is the vertical distance from the center of the exhaust hole to the axis of the crankshaft.
[0055] Figure 4 This is a sectional view of the inclined cut of the cylinder and the blade groove of an embodiment of the present invention. In this embodiment, a chamfer 211 is provided on the blade groove 21 at the inner wall of the cylinder. The chamfer 211 has an intersection point C (not shown in the figure) with the inner wall of the cylinder 2. The inner wall of the cylinder 2 is provided with an inclined cut DV. The inclined cut has two ends (intersection points) on the inner wall of the cylinder 2, which are the A end and the B end respectively. The end (A end) of the inclined cut DV close to the blade groove 21 is provided at the chamfer 211 of the blade groove 21, and the A end does not overlap with the intersection point C. The above setting prevents a clearance dead angle from being formed when the piston rotates to the A end, resulting in over-compression and affecting the performance of the compressor.
[0056] The present invention also provides a compressor, including the compressor sealing structure. Since the compressor has higher sealing performance at the cylinder, the compressor has higher working efficiency. The compressor of the present invention solves the limitation of the minimum sealing distance between the exhaust hole and the inner circle of the piston on the structural design of the compressor, and realizes the reduction of both the clearance volume and the exhaust resistance losses.
[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
[0058] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.
Claims
1. A compressor sealing structure, characterized in that, Includes crankshaft, upper cylinder head, lower cylinder head, cylinder, and piston; At least one of the upper cylinder head and the lower cylinder head is provided with an exhaust port; The crankshaft includes at least an eccentric portion, and an extension section is provided on the outer periphery of one end face of the eccentric portion that abuts against the upper cylinder head and / or the lower cylinder head on which the exhaust port is provided; The upper cylinder head and the lower cylinder head are respectively fixed to the two axial ends of the cylinder and form a cylinder cavity; The cylinder is provided with a blade groove that communicates with the cylinder cavity, and blades are provided in the blade groove; The piston is sleeved on the eccentric part, and the eccentric part of the piston and the crankshaft is disposed in the cylinder cavity. The end face of the protruding section and the end face of the piston form a continuous surface. The projection of the exhaust port onto a plane perpendicular to the crankshaft axis at least partially coincides with the projection of the blade onto a plane perpendicular to the crankshaft axis.
2. The compressor sealing structure according to claim 1, characterized in that, The area of the exhaust port is S; The area of the portion where the projection of the exhaust port on the plane perpendicular to the crankshaft axis coincides with the projection of the blade on the plane perpendicular to the crankshaft axis is S0, which satisfies: S0≤0.05*S.
3. The compressor sealing structure according to claim 1, characterized in that, The width of the blade is d; The minimum vertical distance between the edge of the exhaust hole covering the blade and the blade is the minimum sealing distance a of the blade, which satisfies: a≥2*d / 3.
4. The compressor sealing structure according to claim 1, characterized in that, The blade groove on the inner wall of the cylinder is chamfered, and the chamfer intersects with the inner wall of the cylinder at a point.
5. The compressor sealing structure according to claim 4, characterized in that, The inner wall of the cylinder is provided with a beveled cut; The oblique cut is located at the chamfer of the blade groove at one end, and does not coincide with the intersection point.
6. The compressor sealing structure according to claim 1, characterized in that, Along the radial direction of the compressor, the difference between the minimum vertical distance between the exhaust port and the crankshaft axis and the vertical distance between the inner edge of the protruding section and the crankshaft axis is the minimum sealing distance δ, which satisfies: δ≥0.5mm.
7. The compressor sealing structure according to claim 1, characterized in that, The perpendicular distance R between the inner edge of the extended section in the crankshaft radial direction and the crankshaft axis satisfies: R1 <R≤L-r-δ; in: R1 is the outer diameter of the thrust portion of the eccentric part; r is the radius of the vent hole; L is the vertical distance from the center of the exhaust port to the axis of the crankshaft; δ is the difference between the minimum vertical distance between the exhaust port and the crankshaft axis and the vertical distance between the inner edge of the protruding section and the crankshaft axis.
8. A compressor, characterized in that, The compressor sealing structure includes any one of claims 1 to 7.