New Static Scroll Disk and Oil-Free Scroll Compressor Comprising the Same

Abstract

This application relates to a new type of stationary scroll disk. The new type of stationary scroll disk includes: a scroll body, a sealing groove, an air inlet, and a sealing strip; the sealing groove is arranged at the top of the scroll body, and the width of the sealing groove is smaller than the width of the top of the scroll body; the sealing groove includes a wire groove part and a dust-proof groove part, the starting end of the wire groove part is the top at the center position of the scroll body, and the ending end of the wire groove part is communicated with the starting end of the dust-proof groove part; the ending end of the dust-proof groove part is tangent to the target outer peripheral arc of the wire groove part, the target outer peripheral arc is the outer peripheral arc corresponding to the wire groove part opposite to the dust-proof groove part, and the dust-proof groove part and the wire groove part form a closed area; the air inlet is arranged within the closed area; the sealing strip is arranged in the sealing groove. The solution provided by this application can save the space for arranging the dust-proof ring groove, is beneficial to the miniaturization of the compressor, and improves the installation efficiency of the compressor.

Description

Technical Field

[0001] This application relates to the technical field of compressors, and in particular to a novel stationary scroll plate and an oil-free scroll compressor including the same. Background Art

[0002] As a power mechanism in an air compression system, a compressor plays an important role in the entire air compression system. The oil-free scroll compressor is widely used in the field of clean air sources due to its ability to achieve oil-free compression, high efficiency, small size, light weight, and stable operation. Most of the existing sealing technologies for oil-free scroll compressors mainly involve setting a stationary plate groove and a dust-proof ring groove on the top of the stationary scroll plate. A stationary scroll plate sealing strip is installed in the stationary plate groove, and a dust-proof ring is installed in the dust-proof ring groove. The main function of the dust-proof ring is to prevent dust, particles, and other impurities outside the working area of the scroll plate from entering the compression chamber, avoiding a reduction in the performance of the compressor and damage to the scroll plate. The stationary scroll plate sealing strip is installed in cooperation with the moving scroll plate sealing strip in the moving scroll plate to keep the compression chamber in a sealed state. Generally, the dust-proof ring is arranged on the stationary scroll plate, so space for installing the dust-proof ring needs to be reserved, resulting in a relatively large volume of the stationary scroll plate and the moving scroll plate that cooperates with it, which is not conducive to miniaturization.

[0003] In the prior art, in the patent with the publication number CN104389786A (a sealing structure for a compressor compression chamber), a sealing structure for a compressor compression chamber is proposed. This sealing structure is provided with a back pressure groove and a groove with a combined cross-section in an inverted convex shape. A sealing strip is embedded in the back pressure groove. When the compressor operates, the compressed air in the high-pressure area of the compression chamber enters the groove, generating an air vortex flow between the groove and the sealing strip, axially lifting the sealing strip, reducing the friction on the end face of the scroll wall, extending the service life, and keeping the axial seal between the moving scroll plate and the stationary scroll plate to prevent axial leakage of the compression chamber.

[0004] The above prior art has the following disadvantages:

[0005] It cannot solve the problem that it is not conducive to the miniaturization of the oil-free scroll compressor due to the need to install a dust-proof ring. Therefore, it is necessary to combine the stationary plate groove and the dust-proof ring groove on the stationary scroll plate so that the sealing strip installed in the new sealing groove of the stationary scroll plate can achieve the purpose of sealing the compression chamber and preventing dust. Summary of the Invention

[0006] To overcome the problems existing in the related art, this application provides a novel stationary scroll plate, which can save the space for setting the dust-proof ring groove, is conducive to the miniaturization of the compressor, and improves the installation efficiency of the compressor.

[0007] The first aspect of this application provides a novel stationary scroll plate, including:

[0008] Scroll body 1, sealing groove 2, air inlet 3, and sealing strip 4;

[0009] The sealing groove 2 is arranged at the top of the scroll body 1, and the width of the sealing groove 2 is smaller than the width of the top of the scroll body 1;

[0010] The sealing groove 2 includes a wire groove part 5 and a dust-proof groove part 6. The starting end of the wire groove part 5 is the top at the center position of the scroll body 1, and the ending end of the wire groove part 5 is communicated with the starting end of the dust-proof groove part 6;

[0011] The ending end of the dust-proof groove part 6 is tangent to the target outer peripheral arc of the wire groove part 5. The target outer peripheral arc is the outer peripheral arc corresponding to the wire groove part 5 opposite to the dust-proof groove part 6, and the dust-proof groove part 6 and the wire groove part 5 form a closed area;

[0012] The air inlet 3 is arranged within the closed area;

[0013] The sealing strip 4 is arranged in the sealing groove 2.

[0014] In one embodiment, the dust-proof groove part 6 is composed of N arc grooves, and N is an integer greater than zero.

[0015] In one embodiment, the outer arc of the i-th arc groove in the N arc grooves is tangent to the outer arc of the (i - 1)-th arc groove;

[0016] The inner arc of the i-th arc groove in the N arc grooves is tangent to the inner arc of the (i - 1)-th arc groove;

[0017] i is an integer greater than zero and less than N + 1.

[0018] In one embodiment, the outer arc of the first arc groove in the N arc grooves is tangent to the outer arc of the ending end of the wire groove part 5;

[0019] The inner arc of the first arc groove in the N arc grooves is tangent to the inner arc of the ending end of the wire groove part 5.

[0020] In one embodiment, the ending end of the N-th arc groove in the N arc grooves is closed and is tangent to the target outer peripheral arc of the wire groove part 5.

[0021] In one embodiment, among the arc grooves of the N arc grooves, the outer arcs and the corresponding inner arcs of each arc groove are concentric arcs.

[0022] In one embodiment, the distances between the outer arcs and the corresponding inner arcs of each arc groove of the N arc grooves are equal, and the distances between the outer arcs and the corresponding inner arcs of each arc groove are equal to the width of the wire groove part 5.

[0023] In one embodiment, the depth of the mold line groove portion 5 is greater than the depth of the dust-proof groove portion 6.

[0024] In one embodiment, the thickness of the sealing strip 4 in the vertical direction in the mold line groove portion 5 is greater than the thickness of the sealing strip 4 in the vertical direction in the dust-proof groove portion 6.

[0025] The second aspect of the present application provides an oil-free scroll compressor, including the novel stationary scroll plate as described above.

[0026] The technical solution provided by the present application may include the following beneficial effects:

[0027] By dividing the sealing groove provided at the top of the scroll body into a mold line groove portion and a dust-proof groove portion, the end of the mold line groove portion is communicated with the start end of the dust-proof groove portion, and the end of the dust-proof groove portion is tangent to the target outer peripheral arc. The target outer peripheral arc is the outer peripheral arc corresponding to the mold line groove portion opposite to the dust-proof groove portion, so that the dust-proof groove portion and the mold line groove portion enclose a closed area. The air inlet is arranged within this closed area, and the sealing strip is installed in the sealing groove. Compared with the prior art, the technical solution of the present application can combine the dust-proof groove portion and the mold line groove portion within the same sealing groove, and the dust-proof groove portion can enclose a closed area with the mold line groove portion. The air inlet is arranged within this closed area. After installing the sealing strip in the sealing groove, the sealing strip in the mold line groove portion and the sealing strip of the moving scroll plate can ensure that the compression chamber remains in a sealed state, and the sealing strip in the dust-proof groove portion can ensure that the gas entering the compression chamber from the air inlet will not be polluted by external dust. Thus, while achieving the effects of sealing and dust prevention, the mold line groove and the dust-proof ring groove are combined, saving the space for setting the dust-proof ring groove, facilitating the miniaturization of the compressor, and improving the installation efficiency of the compressor.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By describing the exemplary embodiments of the present application in more detail in combination with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. Among them, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0030] Figure 1 is a schematic structural diagram of the novel stationary scroll plate shown in the embodiment of the present application;

[0031] Figure 2 is a schematic structural diagram of the sealing strip of the novel stationary scroll plate shown in the embodiment of the present application;

[0032] Figure 3It is a schematic structural diagram of the sealing groove of the novel stationary scroll plate shown in the embodiments of the present application. Detailed implementation manners

[0033] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0034] The terms used in the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0035] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0036] Embodiment 1

[0037] As the power mechanism in an air compression system, the compressor plays an important role in the entire air compression system. The oil-free scroll compressor is widely used in the field of clean air sources due to its ability to achieve oil-free compression, high efficiency, small size, light weight, and stable operation. Most of the existing sealing technologies for oil-free scroll compressors mainly involve setting a static scroll disk groove and a dust-proof ring groove on the top of the static scroll disk. A static scroll disk sealing strip is installed in the static scroll disk groove, and a dust-proof ring is installed in the dust-proof ring groove. The main function of the dust-proof ring is to prevent dust, particles, and other impurities outside the working area of the scroll disk from entering the compression chamber, avoiding a reduction in the performance of the compressor and damage to the scroll disk. The static scroll disk sealing strip is installed in cooperation with the dynamic scroll disk sealing strip in the dynamic scroll disk to keep the compression chamber in a sealed state. Generally, the dust-proof ring is arranged on the static scroll disk, so space for installing the dust-proof ring needs to be reserved, resulting in a relatively large volume of the static scroll disk and the dynamic scroll disk that cooperates with it, which is not conducive to miniaturization. In the prior art, a sealing structure for the compression chamber of a compressor was proposed. This sealing structure has a back pressure groove and a groove with a combined cross-section in an inverted convex shape. A sealing strip is embedded in the back pressure groove. When the compressor operates, the compressed air in the high-pressure area of the compression chamber enters the groove, generating an air vortex flow between the groove and the sealing strip, axially lifting the sealing strip, reducing the friction on the end face of the scroll wall, extending the service life, and maintaining axial sealing between the dynamic scroll disk and the static scroll disk to prevent axial leakage of the compression chamber. However, the above prior art has drawbacks and cannot solve the problem that the installation of the dust-proof ring is not conducive to the miniaturization of the oil-free scroll compressor. Therefore, it is necessary to combine the static scroll disk groove and the dust-proof ring groove on the static scroll disk so that the sealing strip installed in the new static scroll disk sealing groove can achieve the purpose of sealing the compression chamber and preventing dust.

[0038] In view of the above problems, an embodiment of the present application provides a new type of static scroll disk, which can save the space for setting the dust-proof ring groove, is conducive to the miniaturization of the compressor, and improves the installation efficiency of the compressor.

[0039] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0040] Please refer to Figure 1 and Figure 2 , Embodiment 1 of the new type of static scroll disk shown in the embodiment of the present application includes:

[0041] A scroll body 1, a sealing groove 2, an air inlet 3, and a sealing strip 4.

[0042] The scroll body 1 refers to the curved surface perpendicular to the bottom surface of the static scroll disk that gradually rotates and unfolds from the center position to the outside on the static scroll disk.

[0043] The sealing groove 2 is arranged at the top of the scroll body 1. The width of the sealing groove 2 is smaller than the width of the top of the scroll body 1 and gradually unfolds from the inside to the outside following the scroll body. The sealing groove 2 includes a wire groove part 5 and a dust-proof groove part 6. The starting end of the wire groove part 5 is the top at the center position of the scroll body 1, and the ending end of the wire groove part 5 is communicated with the starting end of the dust-proof groove part 6. It can be understood that the current sealing groove is divided into two regions, and the two regions play different roles. The wire groove part can be the original static disk wire groove, and the dust-proof groove is a groove extended from the original static disk wire groove.

[0044] The ending end of the dust-proof groove part 6 is tangent to the target outer peripheral arc of the wire groove part 5. The target outer peripheral arc is the outer peripheral arc corresponding to the wire groove part 5 opposite to the dust-proof groove part 6. It can be understood that the extended dust-proof groove part 6 needs to gradually approach the wire groove part 5 until the ending end of the dust-proof groove part 6 is tangent to the target outer peripheral arc, so that the dust-proof groove part 6 and the wire groove part 5 enclose a closed region.

[0045] An air inlet 3 is arranged in the closed region enclosed by the dust-proof groove part 6 and the wire groove part 5. In the embodiment of the present application, the air inlet 3 can be arranged on the inner peripheral surface of the scroll body 1 where the dust-proof groove part 6 is located. It can be understood that in practical applications, the setting position of the air inlet 3 is diverse, and the position of the air inlet 3 needs to be set according to the actual application situation. The description of the setting position of the air inlet 3 here is only exemplary and does not serve as the only limitation on the setting position of the air inlet 3.

[0046] The sealing strip 4 is installed in the sealing groove 2. The sealing strip 4 can adopt a PTFE sealing strip. It can be understood that in practical applications, other materials of sealing strips can be selected according to the actual application situation. The description of the material of the sealing strip 4 here is only exemplary and does not serve as the only limitation on the material of the sealing strip 4.

[0047] The following beneficial effects can be seen from the above-mentioned first embodiment:

[0048] By dividing the sealing groove provided at the top of the scroll body into a wire groove portion and a dust-proof groove portion, the end of the wire groove portion is communicated with the start end of the dust-proof groove portion, and the end of the dust-proof groove portion is tangent to the target outer peripheral arc. The target outer peripheral arc is the outer peripheral arc corresponding to the wire groove portion opposite to the dust-proof groove portion, so that the dust-proof groove portion and the wire groove portion enclose a closed area. The air inlet is arranged within this closed area, and the sealing strip is installed in the sealing groove. Compared with the prior art, the technical solution of the present application can combine the dust-proof groove portion and the wire groove portion within the same sealing groove, and the dust-proof groove portion can enclose a closed area with the wire groove portion. The air inlet is arranged within this closed area. After the sealing strip is installed in the sealing groove, the sealing strip in the wire groove portion and the sealing strip of the moving scroll disk can ensure that the compression chamber remains in a sealed state, and the sealing strip in the dust-proof groove portion can ensure that the gas entering the compression chamber from the air inlet will not be contaminated by external dust. Thus, while achieving the effects of sealing and dust prevention, the wire groove and the dust-proof ring groove are combined, saving the space for setting the dust-proof ring groove, facilitating the miniaturization of the compressor, and improving the installation efficiency of the compressor.

[0049] Embodiment 2

[0050] For the convenience of understanding, an embodiment of the new stationary scroll disk is provided below for illustration. In practical applications, the dust-proof groove portion is composed of multiple arc segments, gradually approaching the wire groove portion, and finally enclosing a closed area with the wire groove portion to achieve the dust-proof effect.

[0051] Please refer to Figure 1 、 Figure 2 and Figure 3 , the second embodiment of the new stationary scroll disk shown in the embodiment of the present application includes:

[0052] The dust-proof groove portion 6 is composed of N arc grooves, where N is an integer greater than zero. The outer arc of the i-th arc groove in the N arc grooves is tangent to the outer arc of the (i - 1)-th arc groove, and the inner arc of the i-th arc groove in the N arc grooves is tangent to the inner arc of the (i - 1)-th arc groove, where i is an integer greater than zero and less than N + 1. As Figure 3 shown, assuming that the dust-proof groove portion is composed of 4 arc grooves, the first arc groove is composed of arc c and arc d, the second arc groove is composed of arc e and arc f, the third arc groove is composed of arc g and arc h, and the fourth arc groove is composed of arc j and arc k. Then arc e is tangent to arc c, arc g is tangent to arc e, arc j is tangent to arc g. Similarly, arc f is tangent to arc d, arc h is tangent to arc f, and arc k is tangent to arc h.

[0053] It can be understood that the above description of the dust-proof groove portion is only exemplary. In practical applications, the number of arcs forming the dust-proof groove portion needs to be set according to the actual application situation, and there is no unique limitation here.

[0054] The outer arc of the first arc groove of the N arc grooves is tangent to the outer arc of the end of the profile groove part 5; the inner arc of the first arc groove of the N arc grooves is tangent to the inner arc of the end of the profile groove part 5. Figure 3 As shown, for example, assuming that the profile groove part 5 is composed of curve a and curve b, arc c and arc d form the first arc groove, then arc c is tangent to the end of curve a, and arc c is tangent to the end of curve b.

[0055] The end of the Nth arc groove among the N arc grooves is closed and tangent to the target outer circumference arc of the profile groove portion 5. Figure 3 As shown, for example, assuming that arc j and arc k form the Nth arc groove, the ends of arc j and arc k need to be connected and closed. The connection method can be a straight line connection or a curve connection, without limitation. Moreover, the straight line or curve or connection point connecting the ends of arc j and arc k is tangent to the target outer circumferential arc of the profile groove part 5, so that the dustproof groove part 6 and the profile groove part 5 enclose a closed area.

[0056] In each of the N arc slots, the outer arc of each segment is concentric with the corresponding inner arc. Figure 3 As shown, arc c and arc d are concentric arcs, arc e and arc f are concentric arcs, arc g and arc h are concentric arcs, and arc j and arc k are concentric arcs.

[0057] The distance between each outer arc of each arc groove of the N arc grooves and the corresponding inner arc is equal, and the distance between each outer arc of each arc groove and the corresponding inner arc is equal to the width of the profile groove part 5. For example, the relationship between the arcs can be expressed by formula A:

[0058] (Rc-Rd)=(Re-Rf)=(Rg-Rh)=(Rj-Rk)=T

[0059] Among them, Rc is the radius of arc c, Rd is the radius of arc d, Re is the radius of arc e, Rf is the radius of arc f, Rg is the radius of arc g, Rh is the radius of arc h, Rj is the radius of arc j, Rk is the radius of arc k, and T is the width of the profile groove part 5.

[0060] It is understandable that in actual applications, there are various methods for expressing the relationship between arc segments. The above description of the relationship between arcs is only exemplary and is not the only limitation on the method for expressing the relationship between arcs.

[0061] The depth of the profile groove portion 5 is greater than the depth of the dustproof groove portion 6. Accordingly, Figure 2As shown, the thickness of the sealing strip 4 in the mold line groove part 5 in the vertical direction is greater than the thickness of the sealing strip 4 in the dust-proof groove part 6 in the vertical direction.

[0062] The following beneficial effects can be seen from the above-mentioned Second Embodiment:

[0063] By dividing the sealing groove into a mold line groove part and a dust-proof groove part, the sealing groove required for placing the dust-proof ring is reduced. The dust-proof groove part is composed of multiple arcs, so that the dust-proof groove part gradually approaches the mold line groove part to form a closed area. It is set that the depth of the mold line groove part is greater than the depth of the dust-proof groove part. Correspondingly, the thickness of the sealing strip installed in the mold line groove part in the vertical direction is greater than the thickness of the sealing strip installed in the dust-proof groove part in the vertical direction. Compared with the prior art, when the sealing strip of the mold line groove part of the technical solution of the present application cooperates with the sealing strip of the moving scroll disk, it can ensure that the crescent-shaped compression cavity remains in a sealed state. The sealing strip of the outermost mold line groove part and the sealing strip of the dust-proof groove part make the scroll disk and the outside form two independent spaces, and the air inlet is arranged in the closed area surrounded by the dust-proof groove part and the mold line groove part. Therefore, impurities such as dust and particles in the outside world cannot cross the sealing strip and enter the compression cavity, improving the cleanliness of the inhaled air and the reliability of the compressor; in addition, increasing the thickness of the sealing strip in the mold line groove part improves the strength and wear resistance of the sealing strip, and at the same time saves the space for setting the dust-proof ring groove, which is beneficial to the miniaturization of the compressor and improves the installation efficiency of the compressor.

[0064] Embodiment Three

[0065] Corresponding to the foregoing method embodiments for realizing application functions, the present application also provides an oil-free scroll compressor and corresponding embodiments.

[0066] The oil-free scroll compressor includes the above-mentioned new stationary scroll disk, which has been described in detail in various embodiments and will not be elaborated here.

[0067] The oil-free scroll compressor including the new stationary scroll disk can save the space for setting the dust-proof ring groove, which is beneficial to the miniaturization of the compressor and improves the installation efficiency of the compressor.

[0068] The solution of the present application has been described in detail above with reference to the drawings. In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also know that the actions and modules involved in the specification are not necessarily essential to the present application. In addition, it can be understood that the steps in the method embodiments of the present application can be adjusted, combined, and deleted according to actual needs, and the modules in the device embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0069] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A novel stationary scroll plate, characterized in that, Comprising: A scroll body (1), a sealing groove (2), an air inlet (3), and a sealing strip (4); The sealing groove (2) is provided at the top of the scroll body (1), and the width of the sealing groove (2) is smaller than the width of the top of the scroll body (1); The sealing groove (2) includes a wire groove part (5) and a dust-proof groove part (6). The starting end of the wire groove part (5) is the top at the center position of the scroll body (1), and the ending end of the wire groove part (5) is communicated with the starting end of the dust-proof groove part (6); The dust-proof groove part (6) is composed of N arc grooves, and N is an integer greater than zero; The outer arc of the i-th arc groove in the N arc grooves is tangent to the outer arc of the (i - 1)-th arc groove; The inner arc of the i-th arc groove in the N arc grooves is tangent to the inner arc of the (i - 1)-th arc groove; Where i is an integer greater than zero and less than N + 1; The ending end of the dust-proof groove part (6) is tangent to the target outer peripheral arc of the wire groove part (5). The target outer peripheral arc is the outer peripheral arc corresponding to the wire groove part (5) opposite to the dust-proof groove part (6). The dust-proof groove part (6) and the wire groove part (5) form a closed area; The outer arc of the first arc groove in the N arc grooves is tangent to the outer arc of the ending end of the wire groove part (5); The inner arc of the first arc groove in the N arc grooves is tangent to the inner arc of the ending end of the wire groove part (5); The ending end of the N-th arc groove in the N arc grooves is closed and tangent to the target outer peripheral arc of the wire groove part (5); The air inlet (3) is provided within the closed area; The sealing strip (4) is provided in the sealing groove (2).

2. The novel stationary scroll disk according to claim 1, wherein In each of the arc grooves of the N arc grooves, the outer arc and the corresponding inner arc are concentric arcs.

3. The novel stationary scroll disk according to claim 2, wherein The distance between the outer arc and the corresponding inner arc of each arc groove of the N arc grooves is equal, and the distance between the outer arc and the corresponding inner arc of each arc groove is equal to the width of the wire groove part (5).

4. The novel stationary scroll disk according to claim 1, wherein The depth of the wire groove part (5) is greater than the depth of the dust-proof groove part (6).

5. The novel stationary scroll disk according to claim 4, wherein The thickness of the sealing strip (4) in the vertical direction in the wire groove part (5) is greater than the thickness of the sealing strip (4) in the vertical direction in the dust-proof groove part (6).

6. An oil-free scroll compressor, characterized in that, Including the novel stationary scroll disk according to any one of claims 1 - 5.

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