Piston ring and oil-free air compressor

Abstract

The utility model discloses a piston ring and an oil-free air compressor. The piston ring comprises a main ring body, a first opening end part connected with a first side surface of the main ring body and a second opening end part connected with a second side surface of the main ring body, the third side face of the first opening end is equally divided into three parts with different protruding degrees, and the first side face of the main ring body is provided with a structure which corresponds to the third side face of the first opening end and can be completely attached to the third side face of the first opening end. The fourth side face of the second opening end is equally divided into three parts with different protruding degrees, and the second side face of the main ring body is provided with a structure which corresponds to the fourth side face of the second opening end and can be completely attached to the fourth side face of the second opening end. According to the piston ring, the opening shape of the piston ring body is changed, so that the piston ring can keep a minimum gap in the using process, and the sealing performance is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of piston rings, and in particular relates to a piston ring and an oil-free air compressor. Background Art

[0002] The piston ring is a sealing ring embedded in the groove of the cylinder piston and is widely used in various power machinery. The piston ring of the oil-free air compressor is usually set on the top of the piston of the oil-free air compressor. The material is a ring structure of polytetrafluoroethylene material. Its function is to form a closed space between the piston and the cylinder wall to prevent the compressed gas from leaking when the oil-free air compressor is working, so as to ensure the normal operation of the oil-free air compressor.

[0003] In the prior art, the opening of the piston ring is easily deformed after the cylinder is pressurized, resulting in a decrease in sealing performance. As the cylinder and piston wear, the opening gap of the piston ring will become larger and larger, resulting in increasing piston leakage, making it impossible to ensure the normal operation of the compressor. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a piston ring and an oil-free air compressor.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] In a first aspect, a piston ring is provided, wherein the piston ring is an open ring, comprising:

[0007] A main ring body, comprising a main upper end surface, a main lower end surface, a first side surface and a second side surface;

[0008] A first open end portion connected to the first side surface of the main ring body comprises a first upper end surface flush with the main upper end surface of the main ring body, a first lower end surface and a third side surface;

[0009] A second open end connected to the second side surface of the main ring body, comprising a second upper end surface flush with the main lower end surface of the main ring body, a second lower end surface mutually abutting against the first lower end surface of the first open end, and a fourth side surface;

[0010] The third side surface of the first opening end is equally divided into three parts with different protrusions, and the first side surface of the main ring body has a structure corresponding to the third side surface of the first opening end and can be completely fitted therewith; and

[0011] The fourth side surface of the second opening end is equally divided into three parts with different protrusion degrees, and the second side surface of the main ring body has a structure corresponding to the fourth side surface of the second opening end and can be completely fitted therewith.

[0012] In some embodiments, the third side surface of the first opening end is equally divided into a first portion, a second portion and a third portion, the first portion and the third portion have the same protrusion degree, and the second portion has a lower protrusion degree than the other two portions.

[0013] In some embodiments, the third side surface of the first opening end is equally divided into a first portion, a second portion and a third portion, and the protrusion degrees of the first portion, the second portion and the third portion increase in sequence.

[0014] In some embodiments, the fourth side surface of the second opening end is equally divided into a fourth portion, a fifth portion and a sixth portion, the fourth portion and the sixth portion have the same protrusion degree, and the fourth portion has a lower protrusion degree than the other two portions.

[0015] In some embodiments, the fourth side surface of the second opening end is equally divided into a fourth portion, a fifth portion and a sixth portion, and the protrusion degrees of the fourth portion, the fifth portion and the sixth portion increase in sequence.

[0016] In some embodiments, the distance between the first upper end face and the first lower end face of the first opening end is the same as the distance between the second upper end face and the second lower end face of the second opening end, and both are 1 / 2 of the distance between the main upper end face and the main lower end face of the main ring body.

[0017] In some embodiments, the inner circumference of the main ring body further has a groove whose two ends are not connected to any other surface of the main ring body.

[0018] In some embodiments, the groove of the main ring body is arranged in the middle of the inner circumference of the main ring body, and its width is 1 / 2 of the distance between the main upper end surface and the main lower end surface of the main ring body.

[0019] In some embodiments, a spring is disposed inside the groove of the main ring body, and two ends of the spring are connected to two ends of the groove of the main ring body.

[0020] In a second aspect, an oil-free air compressor is provided, comprising: the piston ring described above.

[0021] The utility model has the beneficial effect that the piston ring can maintain a minimum gap during use by changing the opening shape of the piston ring body, thereby improving the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1This is an overall structural diagram of the utility model in one embodiment;

[0024] Figure 2 A half-section top view provided in one embodiment of the utility model;

[0025] Figure 3 A side view provided in one embodiment of the utility model;

[0026] Figure 4 This is an overall structural diagram of the utility model in one embodiment;

[0027] Figure 5 It is a half-section top view provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0028] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-3 As shown, the piston ring comprises: a main ring body 10, a first open end 20 connected to a first side surface of the main ring body, and a second open end 30 connected to a second side surface of the main ring body.

[0030] The main ring body 10 includes a main upper end face 101, a main lower end face 102, a first side face 103, and a second side face 104. The first opening end portion 20 includes a first upper end face 201 flush with the main upper end face 101 of the main ring body 10, a first lower end face 202, and a third side face 203. The second opening end portion 30 includes a second upper end face 301 flush with the main lower end face 102 of the main ring body 10, a second lower end face 302 mutually abutting against the first lower end face 202 of the first opening end portion 20, and a fourth side face 303.

[0031] It can be understood that the first upper end face 201 of the first opening end 20 and the main upper end face 101 of the main ring body 10 together constitute the total upper end face of the piston ring, and the second lower end face 302 of the second opening end 30 and the main lower end face 102 of the main ring body 10 together constitute the total lower end face of the piston ring. When the piston ring is in a state where no external force is applied, the opening of the piston ring is 0, the total upper end face and the total lower end face of the piston ring are parallel to each other, and the total outer circumference and the total inner circumference of the piston ring are both smooth and closed annular curved surfaces. At this time, the first lower end face 202 of the first opening end 20 is completely in contact with the second lower end face 302 of the second opening end 30; the first side face 103 of the main ring body 10 is completely in contact with the third side face 203 of the first opening end 20; the second side face 104 of the main ring body 10 is completely in contact with the fourth side face 303 of the second opening end 30.

[0032] The third side surface 203 of the first opening end 20 is equally divided into three parts with different protrusion degrees. The first side surface 103 of the main ring body 10 has a structure corresponding to the third side surface 203 of the first opening end 20 and can be completely fitted therewith.

[0033] The fourth side surface 303 of the second opening end portion 30 is equally divided into three parts with different protrusion degrees. The second side surface 104 of the main ring body 10 has a structure corresponding to the fourth side surface 303 of the second opening end portion 30 and can be completely fitted therewith.

[0034] The specific implementation method of equally dividing the third side surface 203 of the first opening end 20 into three parts with different protrusion degrees may be as follows: Figure 1-2 As shown, in one embodiment, the third side surface 203 of the first opening end portion 20 is equally divided into a first portion 2031, a second portion 2032 and a third portion 2033, the first portion 2031 and the third portion 2033 have the same convexity, and the second portion 2032 has a lower convexity than the other two portions; Figure 4-5 As shown, in one embodiment, the third side surface 203 of the first opening end 20 is equally divided into a first portion 2031, a second portion 2032 and a third portion 2033, and the protrusion degrees of the first portion 2031, the second portion 2032 and the third portion 2033 increase in sequence.

[0035] The specific implementation method of equally dividing the fourth side surface 303 of the second opening end portion 30 into three parts with different protrusion degrees may be as follows: Figure 1-2 As shown, in one embodiment, the fourth side surface 303 of the second opening end portion 30 is equally divided into a fourth portion 3031, a fifth portion 3032 and a sixth portion 3033, the fourth portion 3031 and the sixth portion 3033 have the same protrusion degree, and the fourth portion 3031 has a lower protrusion degree than the other two portions; Figure 4-5 As shown, in one embodiment, the fourth side surface 303 of the second opening end 30 is equally divided into a fourth portion 3031, a fifth portion 3032 and a sixth portion 3033, and the protrusion degrees of the fourth portion 3031, the fifth portion 3032 and the sixth portion 3033 increase in sequence.

[0036] It is understandable that the structures of the third side surface 203 of the first opening end 20 and the fourth side surface 303 of the second opening end 30 do not have to be completely the same. Figure 1-2 and Figure 4-5 The embodiment is only a preferred embodiment, and the third side surface 203 of the first opening end 20 may also be Figure 1-2 or Figure 4-5In one embodiment, the fourth side surface 303 of the second opening end 30 adopts another embodiment different from the embodiment of the third side surface 203 of the first opening end 20. The shape of the protrusion is not necessarily the same as the embodiment in the figure, as long as the first side surface 103 of the main ring body 10 and the third side surface 203 of the first opening end 20 can be fitted with each other and the second side surface 104 of the main ring body 10 and the fourth side surface 303 of the second opening end 30 can be fitted with each other. The third side surface 203 of the first opening end 20 can be equally divided into three parts along the horizontal or vertical direction, the fourth side surface 303 of the second opening end 30 can be equally divided into three parts along the horizontal or vertical direction, and the equal division direction of the third side surface 203 of the first opening end 20 and the fourth side surface 303 of the second opening end 30 can also be the same or different.

[0037] like Figure 3 As shown, in one embodiment, the distance between the first upper end face 201 and the first lower end face 202 of the first opening end 20 is the same as the distance between the second upper end face 301 and the second lower end face 302 of the second opening end 30, and both are 1 / 2 of the distance between the main upper end face 101 and the main lower end face 102 of the main ring body 10.

[0038] It can be understood that the distance between the first upper end face 201 and the first lower end face 202 of the first opening end 20 and the distance between the second upper end face 301 and the second lower end face 302 of the second opening end 30 do not have to be the same. The added distance only needs to be the same as the distance between the main upper end face 101 and the main lower end face 102 of the main ring body 10.

[0039] like Figure 2 As shown, in order to increase the anti-deformation performance of the piston ring, in one embodiment, the inner circumference of the main ring body 10 also has a groove 40 whose two ends are not connected to any other surface of the main ring body 10. In one embodiment, the groove 40 of the main ring body 10 is arranged in the middle of the inner circumference of the main ring body 10, and its width is 1 / 2 of the distance between the main upper end face 101 and the main lower end face 102 of the main ring body 10. In one embodiment, a spring 401 is arranged inside the groove 40 of the main ring body 10, and the two ends of the spring 401 are connected to the two ends of the groove 40 of the main ring body 10.

[0040] It is understandable that the groove 40 of the main ring body 10 does not have to be set in the middle of the inner circumference of the main ring body 10, and its width does not have to be 1 / 2 of the distance between the main upper end surface 101 and the main lower end surface 102 of the main ring body 10.

[0041] The above description is merely a preferred embodiment of one or more embodiments of the present specification and is not intended to limit one or more embodiments of the present specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present specification shall be included in the scope of protection of one or more embodiments of the present specification.

Claims

1. A piston ring, the piston ring being an open ring, characterized in that: include: A main ring body, comprising a main upper end surface, a main lower end surface, a first side surface and a second side surface; A first open end portion connected to the first side surface of the main ring body, comprising a first upper end surface flush with the main upper end surface of the main ring body, a first lower end surface, and a third side surface; A second open end connected to the second side surface of the main ring body, comprising a second upper end surface flush with the main lower end surface of the main ring body, a second lower end surface mutually abutting against the first lower end surface of the first open end, and a fourth side surface; The third side surface of the first opening end is equally divided into three parts with different protrusions, and the first side surface of the main ring body has a structure corresponding to the third side surface of the first opening end and can be completely fitted therewith; and The fourth side surface of the second opening end is equally divided into three parts with different protrusion degrees, and the second side surface of the main ring body has a structure corresponding to the fourth side surface of the second opening end and can be completely fitted therewith.

2. The piston ring according to claim 1, characterized in that: The third side surface of the first opening end is equally divided into a first portion, a second portion and a third portion. The first portion and the third portion have the same protrusion degree, and the second portion has a lower protrusion degree than the other two portions.

3. The piston ring according to claim 1, characterized in that: The third side surface of the first opening end is equally divided into a first portion, a second portion and a third portion, and the protrusion degrees of the first portion, the second portion and the third portion increase in sequence.

4. The piston ring according to claim 1, characterized in that: The fourth side surface of the second opening end is equally divided into a fourth portion, a fifth portion and a sixth portion. The fourth portion and the sixth portion have the same protrusion degree, and the fourth portion has a lower protrusion degree than the other two portions.

5. The piston ring according to claim 1, characterized in that: The fourth side surface of the second opening end is equally divided into a fourth portion, a fifth portion and a sixth portion, and the protrusion degrees of the fourth portion, the fifth portion and the sixth portion increase in sequence.

6. The piston ring according to claim 1, characterized in that: The distance between the first upper end face and the first lower end face of the first opening end is the same as the distance between the second upper end face and the second lower end face of the second opening end, which is 1 / 2 of the distance between the main upper end face and the main lower end face of the main ring body.

7. The piston ring according to claim 1, characterized in that: The inner circumference of the main ring body also has grooves whose two ends are not connected to any other surface of the main ring body.

8. The piston ring according to claim 7, characterized in that The groove of the main ring body is arranged in the middle of the inner circumference of the main ring body, and its width is 1 / 2 of the distance between the main upper end surface and the main lower end surface of the main ring body.

9. The piston ring according to claim 7, characterized in that: A spring is arranged inside the groove of the main ring body, and two ends of the spring are connected to two ends of the groove of the main ring body.

10. An oil-free air compressor, characterized in that: The piston ring comprises the piston ring according to any one of claims 1 to 9.

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