Sealing structure with air passage and scroll compressor with sealing structure

Abstract

The invention discloses a sealing structure with a ventilation channel and a scroll compressor with the same, the sealing structure is used for being mounted in a mounting groove, the sealing structure comprises at least two sealing parts, the sealing parts are arranged in the width direction of the mounting groove at intervals, and a first interval space is formed between the two sealing parts; the first sealing air cavity is all or part of the first interval space; the first sealing air cavity is used for being communicated with at least one air passage and receiving air with a certain volume input by the air passage. The sealing effect of the sealing structure can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a sealing structure with an air vent and a scroll compressor having the same. Background Art

[0002] A scroll compressor is a gas compressor without a reciprocating mechanism. It mainly relies on the scroll line between the moving scroll disk (hereinafter referred to as the moving disk) and the stationary scroll disk (hereinafter referred to as the stationary disk) to compress the gas to be processed to obtain high-pressure gas. During use, the scroll compressor needs to be isolated from the gas inside and outside the scroll compressor by a sealing structure arranged on the outside of the scroll line. In the prior art, a single sealing strip structure is often used for sealing. During the relative movement of the moving disk and the stationary disk, this sealing structure may be displaced, deformed or worn due to friction or relative movement, resulting in a gap between the contact surface of the sealing structure and the moving disk and / or the stationary disk, affecting the sealing effect. Summary of the invention

[0003] In view of at least one defect or improvement demand of the prior art, the present invention provides a sealing structure with an air vent and a scroll compressor having the same, so as to improve the sealing effect of the sealing structure.

[0004] To achieve the above object, the present invention adopts the following technical solution. The present invention proposes a sealing structure with a vent,

[0005] The sealing structure comprises at least two sealing parts;

[0006] The sealing portion is mounted on the second contact surface and arranged in the first direction, and the first end of the sealing portion is used to contact the first contact surface to form a seal at the first end;

[0007] The two sealing parts have a first spacing space;

[0008] A sealed air cavity, which is all or part of the first spacing space;

[0009] A vent hole is provided on the second contact surface, so that the sealed air cavity is connected to at least one first air passage through the vent hole;

[0010] The first direction is a direction in which gas flows in or out of an air gap generated by relative movement between the first end of the sealing portion and the first contact surface.

[0011] Furthermore, a limiting member is arranged between the sealing parts, and the limiting member is also mounted and fixed to the second contact surface, so that the limiting member occupies a certain space in the first interval space.

[0012] Furthermore, the limiting members are arranged at intervals along the outer periphery of the second contact surface, and the vent holes are arranged at the intervals of the limiting members.

[0013] Furthermore, the limiting member is continuously arranged along the outer periphery of the second contact surface, and a second air passage is opened on the limiting member, so that the sealed air cavity is connected to the first air passage through the air hole and the second air passage.

[0014] Furthermore, the sealing portion is fixed to the mounting groove through the protruding structure of the second contact surface.

[0015] Further, the vent holes are arranged at intervals along the outer periphery of the second contact surface, and are arranged at intervals of the protruding structures.

[0016] Furthermore, a third air passage is provided on the protruding structure continuously along the periphery of the second contact surface, so that the sealed air cavity is connected to the first air passage through the air hole and the third air passage.

[0017] Furthermore, a fourth air passage is provided on the sealing portion, so that the sealed air cavity is connected to the first air passage through the air hole and the fourth air passage.

[0018] The present invention also provides an installation groove for installing a sealing structure, wherein the installation groove is arranged outside the vortex line of a fixed scroll plate or a movable scroll plate, and the installation groove has a certain width in a first direction, and is used to install a sealing structure as described in any one of the above items; the installation groove also includes an air vent for connecting to a first air duct.

[0019] The present invention also provides a scroll compressor with a sealing structure, the scroll compressor comprising a fixed scroll and a movable scroll, characterized in that: at least one mounting groove is arranged on the outer circumference of the vortex line of the fixed scroll or the movable scroll, and a sealing structure as described in any one of the above items is installed in the mounting groove; the mounting groove also includes an air vent for connecting to a first air duct.

[0020] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0021] The present invention first proposes a sealing structure, which includes two sealing parts and a sealed air cavity formed by a first spacing space between the two sealing parts, and through a vent hole, the air cavity can maintain a positive pressure effect on the outside of the compressor to achieve sealing inside the scroll compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A cross-sectional view of a scroll compressor provided by an embodiment of the present invention;

[0024] Figure 2 A cross-sectional view of a sealing structure provided by an embodiment of the present invention;

[0025] Figure 3 A top view of a scroll compressor provided by an embodiment of the present invention;

[0026] Figure 4 A cross-sectional view of a sealing structure with a limit member structure provided by an embodiment of the present invention;

[0027] Figure 5 A top view of another sealing structure with a limiting member structure provided by an embodiment of the present invention;

[0028] Figure 6 A cross-sectional view of a sealing structure with a protruding structure provided by an embodiment of the present invention;

[0029] Figure 7 A cross-sectional view of a sealing structure using an L-shaped sealing portion provided in an embodiment of the present invention;

[0030] Figure 8 A cross-sectional view of another scroll compressor provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] The terms "first", "second", "third", etc. in the specification and claims of the present invention and the above drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0034] As a first embodiment of the present invention, a sealing structure implemented by two sealing parts is provided. Figure 1 The cross-sectional view of the main view of the scroll compressor is shown, including the upper rotating disk and the lower stationary disk. The figure also shows the scroll lines of the rotating disk and the stationary disk. The sealing structure provided in this embodiment is located outside the scroll line of the scroll disk, that is, Figure 1 In the middle A.

[0035] Figure 2 for Figure 1 The enlarged view at point A is a view of the sealing structure of this embodiment. Figure 2 Two sealing parts are shown in FIG. 1 , which are called the first sealing part and the last sealing part in this embodiment. The first sealing part and the last sealing part are arranged at intervals in the first direction. Figure 2 In the structure shown, Figure 2 The left side is the outside air. Figure 2 The right side is the internal space of the scroll compressor.

[0036] Figure 2 The first seal and the last seal are installed on the static disk, where: Figure 2 The two sealing parts shown, the sealing part on the left is the first sealing part, and the sealing part on the right is the last sealing part. A mounting groove is provided on the static disk, and the first sealing part and the last sealing part are arranged in the mounting groove, wherein the first sealing part is mounted on the first surface of the mounting groove, and the last sealing part is mounted on the second surface of the mounting groove. The top ends of the first sealing part and the last sealing part are in contact with the moving disk. In this embodiment, the ends of the first sealing part and the last sealing part in contact with the moving disk are called the first ends.

[0037] exist Figure 2 In the embodiment, the first sealing part and the last sealing part are arranged at intervals in the first direction. Figure 2 The first direction shown in the figure is the diameter direction of the scroll compressor. A first spacing space is formed between the first sealing part and the last sealing part. In this embodiment, the first spacing space forms a sealed air cavity, that is, the sealed air cavity is the entire first spacing space.

[0038] exist Figure 2 In the embodiment, the sealed air cavity is also connected to the air passage below through the vent hole, and the air passage is referred to as the first air passage in the present invention. The first air passage is usually used to be connected to an air supply device, and the air supply method is not shown in the figure.

[0039] The sealing principle of the above-mentioned sealing structure is as follows: First, the sealing parts are in contact with the static disk and the dynamic disk. Therefore, the inside and outside of the scroll compressor are isolated by two sealing parts, and the sealing effect is better than that of the conventional structure with one sealing part. Secondly, the sealing parts are arranged at intervals to form a sealed air cavity, and the air cavity is supplied with air through the first air duct, and the internal air pressure is the same as or slightly greater than the external air pressure. When the scroll compressor is evacuated, even if the contact surface between the first sealing part on the left and the dynamic disk produces an air gap due to relative movement, due to the gas pressure inside and outside, it is difficult for outside air to enter the sealed air cavity through the air gap. Especially when a slight positive pressure is formed in the air cavity, the pressure difference between the inside and outside will prevent outside air from entering the sealed air cavity. This prevents the compressed gas inside the scroll compressor from inhaling outside air, achieving a better airtight effect.

[0040] Generally speaking, the gas source connected to the first airway is the gas used for compression in the scroll compressor, that is, the same gas as the gas inside the scroll compressor. In other embodiments, for example, when 93% to 95% pure oxygen is evacuated and compressed using a scroll compressor, oxygen with a higher purity can also be used as the gas source connected to the first airway.

[0041] In this embodiment, the size of the sealed air cavity has little effect on the sealing effect. Therefore, the total amount of compressed gas in the sealed air cavity will not be too large. The vent holes do not need to be densely arranged in the circumferential direction. Only a few vent holes need to be opened in the circumferential direction. Figure 3 The scheme of arranging 4 vents on the stator disk is shown. Those skilled in the art can also increase or decrease the number of vents in the circumferential direction according to the needs, such as the size of the stator disk.

[0042] As the second embodiment of the present invention, based on the first embodiment, the installation method of the sealing part is further limited. When the moving plate and the stationary plate move relative to each other, the sealing part may be affected by the friction force of the moving plate or the stationary plate and cause displacement. Therefore, certain installation measures need to be taken to fix the sealing part.

[0043] To further secure the seal, see Figure 4 , a stopper may be provided between the sealing parts. The height of the stopper usually needs to be high enough so that the sealing part can be fixed, and usually needs to be half the height of the sealing part. On the other hand, the stopper may be a structure with a certain elasticity, which is used to push the sealing part against the first surface and the second surface of the mounting groove in the lateral direction, and the stopper may be fixed by the lateral extrusion force.

[0044] When the limiter is continuous along the circumference of the static disk, the following can be used: Figure 4In this way, a second air passage is opened on the limiter, the second air passage is connected to the through hole, and further connected to the first air passage, so that a ventilation structure for conveying gas into the sealed air cavity can be formed through the first air passage and the second air passage, thereby achieving a sealing effect.

[0045] Another way to set it up can be found in Figure 5 When the limiting member is discontinuous in the circumferential direction of the outer periphery of the static disk, a vent hole and a first vent channel can be provided at the discontinuity, so that the sealed air cavity in the circumferential direction can still transport gas through the first vent channel to achieve a sealing effect.

[0046] Figure 6 Another way of securing the seal is shown. Figure 6 In the embodiment, a protrusion structure is left on the second contact surface of the static disk, and a groove structure for installing the sealing part is formed between the protrusion structure and the first surface and the second surface of the installation groove. Figure 6 The seal can also be fixed in the illustrated small groove configuration.

[0047] Similar to the stopper, when the protrusion structure is continuous along the circumference of the stator, the following method can be used: Figure 6 In a manner, a third air passage is provided on the protruding structure, the third air passage is connected to the through hole, and further connected to the first air passage, so that a ventilation structure for conveying gas into the sealed air cavity can be formed through the first air passage and the third air passage, thereby achieving a sealing effect. When the protruding structure is discontinuous in the circumferential direction of the outer periphery of the static disk, a vent hole and a first air passage can be provided at the discontinuity, so that the sealed air cavity in the circumferential direction can still convey gas through the first air passage, thereby achieving a sealing effect.

[0048] As the third embodiment of the present invention, on the basis of the first embodiment, when the bottom width of the adopted sealing portion is too wide and may block the vent hole, a fourth vent channel can be opened on the sealing portion to achieve the sealing effect as in the first embodiment. Figure 7 The figure shows the arrangement of the air duct when an L-shaped sealing portion is used. Figure 7 In the embodiment, the sealing part on the right side is L-shaped, and its bottom may block the vent hole on the static disk. Therefore, the sealing part also needs to provide a fourth vent, which is used to be connected to the vent and then connected to the first vent.

[0049] In the present invention, the first direction is defined as the direction in which the gas flows into or out of the air gap generated by the relative movement between the first end and the first contact surface. Figure 1 In the scroll compressor shown in FIG. 1 , in which both the moving disk and the stationary disk are close to a plane, the first direction is close to the radial direction of the moving disk and the stationary disk. Figure 8In the scroll compressor with a concave stator disk shown in FIG. 1 , the sealing structure may also be arranged on the side of the stator disk, that is, Figure 8 At C, at this time, the first direction still needs to be maintained as the direction of gas inflow or outflow in the air gap, that is, Figure 8 in the direction perpendicular to the stationary disk.

[0050] In the above embodiment, the two sealing parts are both circular close to the outer edge of the stator disk when viewed from above. In other embodiments, the two sealing parts may also be various polygonal structures when viewed from above, as long as they form a continuous seal around the vortex line of the stator disk or the moving disk.

[0051] In the above embodiment, the installation grooves of the two sealing parts are both arranged on the static disk, which is a relatively easy structure to process. Those skilled in the art can also install the sealing part on the dynamic disk as required, in which case the first contact surface is the contact surface between the sealing part and the static disk.

[0052] In the above embodiment, the contact surfaces between the two sealing parts and the static disk are both planes. In the present invention, the contact surface between the sealing part and the static disk can also be set to other shapes, such as arc-shaped connection, which can still achieve similar effects. This setting method will not be repeated here.

[0053] The present invention also provides an installation groove for installing a sealing structure, characterized in that the installation groove is arranged on the outside of the vortex line of the fixed scroll plate or the movable scroll plate, and the installation groove has a certain width in the first direction, and is used to install a sealing structure such as any of the above-mentioned embodiments; the installation groove also includes an air vent for connecting to the first air duct.

[0054] The present invention also provides a scroll compressor with a sealing structure, the scroll compressor comprising a fixed scroll and a movable scroll, characterized in that: at least one mounting groove is arranged on the outer circumference of the vortex line of the fixed scroll or the movable scroll, and a sealing structure as in any of the above-mentioned embodiments is installed in the mounting groove; the mounting groove also includes an air vent for connecting to the first air duct.

[0055] It should be noted that, for the aforementioned method embodiments, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required for the present invention.

[0056] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0057] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of the implementation scheme of the present disclosure. The present invention is intended to cover any variation, use or adaptive change of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

[0058] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 present invention.

Claims

1. A sealing structure with an air vent, characterized in that: The sealing structure comprises at least two sealing parts; The sealing portion is mounted on the second contact surface and arranged in the first direction, and the first end of the sealing portion is used to contact the first contact surface to form a seal at the first end; The two sealing parts have a first spacing space; A sealed air cavity, which is all or part of the first spacing space; A vent hole is provided on the second contact surface, so that the sealed air cavity is connected to at least one first air passage through the vent hole; The first direction is a direction in which gas flows in or out of an air gap generated by relative movement between the first end of the sealing portion and the first contact surface.

2. The sealing structure with a vent as claimed in claim 1, characterized in that: A limiting member is arranged between the sealing parts, and the limiting member is also fixedly mounted on the second contact surface, so that the limiting member occupies a certain space in the first interval space.

3. The sealing structure with a vent as claimed in claim 2, characterized in that: The limiting members are arranged at intervals along the outer circumference of the second contact surface, and the vent holes are arranged at the intervals of the limiting members.

4. The sealing structure with a vent as claimed in claim 2, characterized in that: The limiting member is continuously arranged along the outer periphery of the second contact surface, and a second air passage is opened on the limiting member, so that the sealed air cavity is connected to the first air passage through the air hole and the second air passage.

5. The sealing structure with a vent as claimed in claim 1, characterized in that: The sealing portion is fixed to the mounting groove through the protruding structure of the second contact surface.

6. The sealing structure with a vent as claimed in claim 5, characterized in that: The protruding structures are arranged at intervals along the outer periphery of the second contact surface, and the vent holes are arranged at the intervals of the protruding structures.

7. The sealing structure with a vent as claimed in claim 5, characterized in that: The protruding structure is continuously arranged along the outer periphery of the second contact surface, and a third air passage is opened on the protruding structure, so that the sealed air cavity is connected to the first air passage through the air hole and the third air passage.

8. The sealing structure with a vent as claimed in any one of claims 1, characterized in that: The sealing portion is provided with a fourth air passage, so that the sealed air cavity is connected to the first air passage through the air hole and the fourth air passage.

9. A mounting groove for mounting a sealing structure, characterized in that: The mounting groove is arranged on the outside of the vortex line of the fixed scroll or the movable scroll, and the mounting groove has a certain width in the first direction, and is used to install the sealing structure with the air duct as described in any one of claims 1-8; the mounting groove also includes an air hole for connecting to the first air duct.

10. A scroll compressor, comprising a fixed scroll and a movable scroll, characterized in that: The outer circumference of the vortex line of the fixed scroll or the movable scroll is distributed with at least one mounting groove, and the sealing structure as described in any one of claims 1-8 is installed in the mounting groove; the mounting groove also includes an air vent for connecting to the first air duct.

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