TWI473703B - Piston set and compressor thereof - Google Patents

Description

Piston group and its compressor

The present invention relates to a piston assembly and a compressor thereof, and more particularly to a piston assembly having a gas inlet and outlet efficiency of a gain air compressor and a compressor therefor.

At present, the air compressors that are commonly used in the industry use a mechanical method to compress the volume of gas. When the gas is compressed and the gas accumulation becomes small, the original pressure will increase, so that compressed air can be used. Drive the machine or other uses. Conventional air compressors are mostly classified into reciprocating type, centrifugal type and axial flow type. Among them, the reciprocating type mostly uses a piston to reciprocate in the cylinder of the compressor, thereby achieving the purpose of compressing air. The current piston design is mostly divided into two types, one is to use Teflon spray method, and the other is to use Teflon ring method.

Referring to FIG. 1 , it is a conventional Teflon spray method, which is generally provided with a convex ring portion 101 at one end of the piston 10 to closely contact the inner wall of the cylinder of the compressor by the convex ring portion 101. In order to reciprocate the piston 10, the purpose of compressing air can be surely achieved. In order to avoid the friction or wear of the convex ring portion 101 and the inner wall of the cylinder when the piston 10 reciprocates, the relevant manufacturer mostly sprays the piston 10 when the piston 10 is manufactured, so that the piston 10 has a Teflon layer 102. . However, the convex ring portion 101 and the piston 10 are mostly integrally formed. Therefore, in the manufacture, most of the manufacturers choose to directly immerse the piston 10 in the Teflon solution. The soaked portion of the surface has a layer of Teflon layer 102. However, in actual use, the piston 10 only has the convex ring portion 101 in substantial contact with the inner wall of the cylinder, thereby wasting a lot of production cost and resources. Furthermore, in order to cope with the presence of the Teflon layer 102, a slight gap is left between the piston 10 and the inner wall of the cylinder, but the gap also causes a problem of leakage, resulting in a decrease in the cooling capacity.

Please refer to FIG. 2 , which is a conventional Teflon ring method. Generally, an annular groove 103 is respectively disposed at two ends of the piston 10 , and is respectively inserted into the annular groove 103 by a Teflon ring 11 . Therefore, in order to achieve the effect of using the Teflon spray method as is conventional. However, such a design has defects in pressure actuation and thermal expansion. Therefore, in actual operation, the Teflon ring 11 may be broken or damaged when the piston 10 reciprocates, thereby generating a cylinder of the compressor. Wear and tear.

Looking at the foregoing problems, the inventors of the present invention have conceived and designed a piston group and a compressor thereof to improve the lack of the prior art, thereby enhancing the industrial use and utilization.

In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide a piston set and a compressor thereof to solve the problems of increased cost and reduced cooling capacity of the prior art.

In accordance with the purpose of the present invention, a piston assembly is provided that is disposed in a cylinder of a compressor that includes a piston and a two piston ring. The piston has a rod-like structure, and a ring is recessed inwardly adjacent to the periphery of the two ends thereof. The groove of the shape, the bottom surface of one of the grooves is provided with at least one ring-shaped convex portion. The two piston rings are respectively sleeved in the two grooves of the piston.

Wherein, each of the at least one convex portion is protruded outward from the axis, and the distance from the bottom to the top may be 0.15 to 0.2 mm.

The cross section of each of the at least one convex portion may be a triangular shape structure, a rectangular structure or an arc shape structure connecting the two side walls of the groove, and each of the at least one convex portion has a rectangular structure and at least one of each One side wall of the convex portion may connect one of the side walls of each of the grooves.

Wherein, each of the piston rings may be deformed to form a circular-shaped annular structure, and has a first opening and a second opening, and the first opening may be larger than the second opening, and the piston is The two end edges are respectively provided with an oblique angle, and each piston ring can be sleeved on the two grooves by the two ends of the piston by using the second openings and the respective oblique angles.

According to the purpose of the present invention, a compressor is further provided, comprising: a compressor body and a piston group. The compressor body has a cylinder. The piston set is disposed in the cylinder and includes a piston and a two piston ring. The piston is a rod-like structure, and a ring-shaped groove is recessed inwardly adjacent to the periphery of the two ends; a bottom surface of each groove is outwardly convex from the axis with at least one ring-shaped convex portion, and each at least The distance from the bottom to the top of a protrusion is 0.05 to 0.3 mm. The two piston rings are respectively sleeved in the two grooves of the piston.

Wherein, each of the at least one convex portion may have a distance from the bottom to the top of 0.15 to 0.2 mm.

According to the purpose of the present invention, a piston set is further provided A cylinder of a compressor comprising a piston and a piston ring. The piston is a rod-like structure, and a ring-shaped groove is recessed inwardly adjacent to a periphery of one end thereof; a bottom surface of one of the grooves is provided with at least one ring-shaped convex portion, and at least a portion of the circumference of the other end is adjacent to the shaft The recess is provided with a chamber, and a recess of a ring shape is recessed between the recess and the cavity. The piston ring is sleeved in the groove of the piston.

Wherein, at least one of the protrusions may have a distance from the bottom to the top of 0.15 to 0.2 mm.

The cross section of each of the at least one convex portion may be a triangular shape structure, a rectangular structure or an arc shape structure connecting the two side walls of the groove, and each of the at least one convex portion has a rectangular structure and at least one of each One side wall of the convex portion may connect one of the side walls of each of the grooves.

Wherein, each of the piston rings may be deformed to form a circular-shaped annular structure, and has a first opening and a second opening, and the first opening may be larger than the second opening, and the piston is The two end edges are respectively provided with an oblique angle, and each piston ring can be sleeved on the two grooves by the two ends of the piston by using the second openings and the respective oblique angles.

In view of the above, the piston assembly and compressor thereof according to the present invention may have one or more of the following advantages:

(1) The piston set and the compressor thereof can be designed such that the piston ring sleeved in the groove can surely and completely contact the inner wall of the cylinder by at least one convex portion and an appropriate size thereof, thereby effectively Improve cooling capacity.

(2) The piston set and its compressor can be designed to reduce the possibility of breakage or damage of the piston ring by at least one projection and its proper size.

The technical features, contents, and advantages of the present invention, as well as the advantages thereof, can be understood by the present inventors, and the present invention will be described in detail with reference to the accompanying drawings. The subject matter is only for the purpose of illustration and description. It is not intended to be a true proportion and precise configuration after the implementation of the present invention. Therefore, the scope and configuration relationship of the attached drawings should not be interpreted or limited. First described.

Please refer to FIG. 3 and FIG. 4, FIG. 3 is a first schematic view of the first embodiment of the piston set of the present invention; and FIG. 4 is a second schematic view of the first embodiment of the piston set of the present invention. As shown, the present invention provides a piston assembly 1 suitable for use in a compressor 2, and a piston assembly 1 is disposed in a cylinder 21 of the compressor 2 for reciprocating motion to achieve the purpose of compressing gas. The piston set 1 includes a piston 10 and a second piston ring 12. The piston 10 is a rod-like structure, and a ring-shaped recess 104 is recessed inwardly at a periphery of the two ends of the piston 10, and a ring-shaped convex portion 1041 is convexly protruded from a bottom surface of the recess 104. . The two piston rings 12 are preferably coated with a Teflon ring on the surface thereof; the two piston rings 12 are respectively sleeved in the grooves 104. When the piston group 1 reciprocates in the cylinder 21 of the compressor 2, the gas enters the cylinder 21 from the two end faces of the piston 10, respectively, so that the piston ring 12 is extended outward from the shaft center, thereby generating on the side wall of the cylinder 21. Close contact to achieve the purpose of compressing gas.

It is to be noted that the convex portion 1041 has a distance from the bottom to the top of 0.05 to 0.3 mm, and preferably 0.15 to 0.2 mm. When the size of the convex portion 1041 is too small, after the piston 10 reciprocates in the cylinder 21 of the compressor 2, the torque value that can be generated is reduced to 0 to 9 kg-cm 2 (kg-cm ² ). If the torque value is too small, the refrigeration capacity or the compressed air capacity of the compressor 2 is insufficient. When the size of the convex portion 1041 is too large, the torque generated by the piston 10 after reciprocating in the cylinder 21 of the compressor 2 may be greater than 31 kg-cm 2 (kg-cm ² ) due to the compressor 2 The refrigeration capacity or compressed air capacity only needs to correspond to the appropriate torque value, and therefore even if the torque value rise does not bring about an increase in the refrigeration capacity or compressed air capacity of the compressor 2, it will be due to the piston ring 12 The frictional force with the inner wall of the cylinder 21 is increased, so that the compressor 2 has to generate a larger horsepower to cause the piston group 1 to reciprocate, thereby generating waste of energy supplied to the compressor 2, and relatively causing use thereof. The above danger exists, so the proper size range of the convex portion 1041 helps to effectively increase its efficiency.

When testing the compressor under the above design specifications, the results of Tables 1 and 2 below can be obtained.

It can be further seen from the above Table 1 that under the same conditions, when the size of the convex portion 1041 is too small (less than 0.15 mm), the coefficient of performance (1.32 and 2.00) will be smaller than the specification designed by the present invention (0.15~0.2). Mm) coefficient of performance (1.62 and 2.22); and when the size of the convex portion 1041 is too large (above 0.2 mm), the coefficient of performance (1.63 and 2.25) is the coefficient of performance of the specifications designed by the present invention (1.62 and 2.22). The gap is not high, However, it will bring additional energy consumption; that is, the difference between the torque of the specification designed by the present invention (16.42, 14.34) and the excessively large torque of the convex portion 1041 (17.34, 15.67) can be known. The excessive size of the convex portion 1041 brings about an increase in the torsion, and the increase in the torque increases the fuel consumption. Further, the excessive size of the convex portion 1041 also affects the temperature, as designed by the present invention. The difference between the discharge temperature (230, 218) of the specification and the discharge temperature (248, 229) of the size of the convex portion 1041 is excessive; therefore, it can be known that the size of the convex portion 1041 exceeds the specification designed by the present invention, and the increase is not It will have an effective impact on performance; however, it will have an impact on energy consumption and temperature, and the increase in energy consumption or temperature, that is, the increased risk of joint use. Alternatively, from Table 2 above, the effect of noise below or above the specifications of the present invention on noise can be known. The specification designed by the present invention (the distance from the bottom portion to the top portion of the convex portion 1041 is 0.15 to 0.2 mm) can obtain a better coefficient of performance under the same conditions and reduce excessive energy consumption, so the specifications designed by the present invention (The distance from the bottom to the top of the convex portion 1041 is 0.15 to 0.2 mm) is an optimum design specification.

Please refer to FIG. 5 for further illustration of the assembly of the first embodiment of the piston assembly of the present invention. As shown, the piston ring 12 can be a disk body having a hole in the center before being assembled, and after being folded in a predetermined direction, the piston ring 12 can be deformed to form a ring-shaped ring. structure. At this time, the piston ring 12 has a first opening 121 and a second opening 122, and the inner diameter of the first opening 121 is larger than the inner diameter of the second opening 122. On the other hand, an edge of the piston 10 can be provided with an oblique angle 105; at this time, the two piston rings 12 can be utilized respectively. The second opening 122 is sleeved toward one end of the piston 10, and also by the oblique angle 105 on the piston 10, so that the piston ring 12 can conform to the slope of the bevel 105, and fit over the rod of the piston 10, and then enter The groove 104 of the piston 10 is completed to complete the assembly of the piston set 1.

Please refer to FIGS. 6 to 9 together, which are various schematic views of the convex portion 1041 of the piston 10. In the present invention, the cross section of the convex portion 1041 of the piston 10 may be a triangular shape structure, a rectangular structure or an arc shape structure. If the number of the convex portions 1041 is plural, they are arranged at intervals, as shown in Fig. 6. If the cross section of the convex portion 1041 is a rectangular structure, one side of the convex portion 1041 may be connected to one of the side walls of the recess to form a stepped shape as shown in FIGS. Moreover, if the cross section of the convex portion 1041 is an arc-shaped structure, it may be an arc-shaped structure connecting the two side walls of the groove 104 (as shown in FIG. 9), or may be an arc that is not connected to the two side walls. The structure is hereby exemplified by an arc structure connecting the two side walls of the groove 104, but is not limited thereto.

Please refer to FIG. 10, which is a schematic view of a second embodiment of the piston set of the present invention. This embodiment is similar to the above-mentioned embodiment, and a similar part thereof will not be described herein. As shown, the piston set 1 of the present invention can also be applied to the variable compressor 2. The piston set 1 includes a piston 10 and a piston ring 12. The piston 10 has a rod-like structure. The piston 10 is recessed inwardly with a ring-shaped recess 104 adjacent the periphery of one end thereof. The bottom surface of one of the grooves 104 is provided with at least one ring-shaped convex portion 1041. A cavity 106 is recessed into the shaft center adjacent to at least a portion of the circumference of the piston 10, and a ring-shaped recess 107 is recessed between the groove 104 and the cavity 106. The piston ring 12 is sleeved in the recess 104 of the piston 10.

Similarly, the distance from the bottom to the top of the convex portion 1041 is 0.05 to 0.3 mm, and preferably 0.15 to 0.2 mm. The cross-sectional shape of the convex portion 1041 may be a non-planar shape such as a triangular shape structure, a rectangular structure, or an arc shape structure.

In summary, the present invention utilizes the separation of the piston and the piston ring, and further coats the outer surface of the piston ring with a Teflon layer to effectively reduce the conventional technique of immersing the piston in the Teflon solution. The waste caused. Further, a convex portion is disposed in the groove to overcome the defect that the piston ring is easy to break when the pressure is activated by the pressure or the thermal expansion by the convex portion, and the convex portion is further disposed in an appropriate range to further increase Its effectiveness (such as cooling capacity or the effect of compressed air).

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1‧‧‧Piston Group

10‧‧‧Piston

101‧‧‧ convex ring

102‧‧‧Teflon layer

103‧‧‧ annular groove

104‧‧‧ Groove

1041‧‧‧ convex

105‧‧‧ oblique angle

106‧‧ ‧ room

107‧‧‧Depression

11‧‧‧Teflon ring

12‧‧‧Piston ring

121‧‧‧first opening

122‧‧‧second opening

2‧‧‧Compressor

21‧‧‧Compressor cylinder

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the conventional use of a Teflon spray method.

Fig. 2 is a schematic view showing the use of a Teflon ring method in the prior art.

Figure 3 is a schematic view of a first embodiment of a piston set of the present invention.

Figure 4 is a second schematic view of a first embodiment of the piston set of the present invention.

Figure 5 is a schematic view showing the assembly of the first embodiment of the piston set of the present invention.

Figure 6 is a third schematic view of the first embodiment of the piston set of the present invention.

Figure 7 is a fourth schematic view of the first embodiment of the piston set of the present invention.

Figure 8 is a fifth schematic view of the first embodiment of the piston set of the present invention.

Figure 9 is a sixth schematic view of the first embodiment of the piston set of the present invention.

Figure 10 is a schematic view showing a second embodiment of the piston set of the present invention.

1‧‧‧Piston Group

10‧‧‧Piston

104‧‧‧ Groove

1041‧‧‧ convex

12‧‧‧Piston ring

Claims (4)

A piston set is disposed in a cylinder of a compressor, comprising: a piston, wherein a ring-shaped groove is recessed inwardly adjacent to a circumference of the two ends thereof, and at least one ring is provided on a bottom surface of each of the grooves a convex portion of the shape; and a second piston ring respectively sleeved in each of the grooves of the piston; wherein each of the at least one convex portion is outwardly protruded from the axial center, and the distance from the bottom to the top is 0.15~0.2 mm (mm). A compressor comprising: a compressor body having a cylinder; and a piston set disposed on the cylinder, comprising: a piston, each of which is recessed inwardly adjacent to a periphery of the two ends thereof a groove, a bottom surface of each of the grooves is convexly provided with at least one ring-shaped convex portion, and a distance from the bottom to the top of each of the at least one convex portion is 0.05 to 0.3 mm (mm); The piston rings are respectively sleeved in the two grooves of the piston. The compressor of claim 2, wherein each of the at least one protrusion has a distance from the bottom to the top of 0.15 to 0.2 mm. A piston set is disposed in a cylinder of a compressor, comprising: a piston, a ring shape recessed inwardly adjacent to a periphery of one end thereof a groove, the bottom surface of one of the grooves is provided with at least one ring-shaped convex portion, and at least a portion of the periphery of the other end is recessed with a cavity to the axial center, and the groove and the chamber are oriented The shaft recess is provided with a ring-shaped recess; and a piston ring is sleeved in the groove of the piston; wherein the at least one protrusion has a distance from the bottom to the top of 0.15 to 0.2 mm (mm) .