阅读说明：本技术 一种活塞压缩机吸气结构 (Air suction structure of piston compressor ) 是由 黄小兰 杨骅 于 2019-08-20 设计创作，主要内容包括：本发明公开了一种活塞压缩机吸气结构,包括连杆、转轴、活塞和吸气滑片；连杆与转轴连接的一端设有驱动结构,驱动结构与连杆固定,驱动结构包括依次分布的上驱动段、压紧段和下驱动段；上驱动段上设有与吸气滑片接触的上圆弧段,上圆弧段的轴线相对于转轴向压紧段一侧偏心设置；下驱动段上设有与吸气滑片接触的下圆弧段,下圆弧段的轴线相对于转轴向压紧段一侧偏心设置；吸气滑片上设有通气孔,活塞上设有吸气孔,吸气孔向上驱动段一侧偏心设置。本发明提供了一种活塞压缩机吸气结构,吸气结构可以主动开闭,减小吸气阻力和回流,提高压缩机的容积效率,同时去除传统易损的吸气阀,提高活塞压缩机的可靠性。(The invention discloses a gas suction structure of a piston compressor, which comprises a connecting rod, a rotating shaft, a piston and a gas suction slip sheet, wherein the connecting rod is connected with the rotating shaft; one end of the connecting rod, which is connected with the rotating shaft, is provided with a driving structure, the driving structure is fixed with the connecting rod, and the driving structure comprises an upper driving section, a pressing section and a lower driving section which are sequentially distributed; the upper driving section is provided with an upper arc section which is contacted with the air suction sliding sheet, and the axis of the upper arc section is eccentrically arranged relative to the rotating shaft towards one side of the pressing section; the lower driving section is provided with a lower arc section which is contacted with the air suction sliding sheet, and the axis of the lower arc section is eccentrically arranged relative to the rotating shaft towards one side of the pressing section; the air suction slip sheet is provided with an air vent, the piston is provided with an air suction hole, and the air suction hole is eccentrically arranged on one side of the upward driving section. The invention provides a gas suction structure of a piston compressor, which can be actively opened and closed, reduce gas suction resistance and backflow, improve the volumetric efficiency of the compressor, and simultaneously remove a traditional easily damaged gas suction valve and improve the reliability of the piston compressor.)

1. A gas suction structure of a piston compressor comprises a connecting rod, a rotating shaft and a piston, wherein the connecting rod is rotatably connected with the piston through the rotating shaft; one end of the connecting rod, which is connected with the rotating shaft, is provided with a driving structure, the driving structure is fixed with the connecting rod, and the driving structure comprises an upper driving section, a pressing section and a lower driving section which are sequentially distributed; the upper driving section is provided with an upper arc section which is contacted with the air suction sliding sheet, and the axis of the upper arc section is eccentrically arranged relative to the rotating shaft towards one side of the pressing section; the lower driving section is provided with a lower arc section which is contacted with the air suction sliding sheet, and the axis of the lower arc section is eccentrically arranged relative to the rotating shaft towards one side of the pressing section; the air suction slip sheet is provided with an air vent, the piston is provided with an air suction hole, and the air suction hole is eccentrically arranged on one side of the upward driving section.

2. A suction structure of a piston compressor in accordance with claim 1, wherein said piston includes a sealing end surface and a receiving cavity; one end of the connecting rod and the air suction sliding sheet are arranged in the accommodating cavity; the air suction hole is arranged on the sealing end face.

3. The suction structure of the piston compressor as claimed in claim 1, wherein the suction sliding vane includes a support portion and a sliding end surface, the ventilation hole is formed on the sliding end surface, the driving structure is formed inside the support portion, and the upper arc section and the lower arc section are respectively in contact with the support portion.

4. A suction structure of a piston compressor in accordance with claim 3, wherein said air vent is eccentrically provided to a side of the downward driving section.

5. The suction structure of a piston compressor as claimed in claim 3, wherein a relief hole is formed on the sliding end surface.

6. The suction structure of a piston compressor as claimed in claim 1, 2, 3, 4 or 5, wherein said suction hole is a long hole, and the direction of extension of the long hole is perpendicular to the sliding direction of the suction vane.

7. The suction structure of the piston compressor as claimed in claim 1, 2, 3, 4 or 5, wherein the cross section of the compressing section is a circular arc, and the center of the circular arc is coincident with the center of the rotating shaft.

8. The suction structure of a piston compressor as claimed in claim 1, 2, 3, 4 or 5, wherein said compressing section has a section of a curve having a center of curvature coinciding with a center of the rotation shaft, and a radius of curvature of the curve is increased from the lower driving section to the upper driving section.

Technical Field

The invention relates to the technical field of piston compressors, in particular to a gas suction structure of a piston compressor.

Background

The air valve is one of the important parts of the piston compressor, and the air valves used by the piston compressor are all passive valves which are automatically opened and closed under the control of the air pressure difference on two sides of the valve plate. When the pressure in the compressor cylinder is lower than the suction pressure and the pressure difference at the two sides of the suction valve is enough to overcome the spring force of the valve plate, the suction valve is opened, and the compressor sucks air; when the piston moves to the position near the bottom dead center and the pressure difference between two sides of the suction valve is equal to or less than the spring force of the suction valve, the suction valve starts to close. On one hand, the suction valve needs to be opened to overcome the spring force of the suction valve, and the pressure of gas sucked into the cylinder by the compressor is generally lower than the suction pressure, which directly influences the volumetric efficiency of the compressor; on the other hand, the gas suction valve is not closed timely under the influence of spring force, and the gas sucked into the cylinder of the compressor partially flows back, so that the volumetric efficiency of the compressor is also influenced. In addition, in the whole life cycle of the compressor, the suction valve is opened and closed at high frequency for a long time, bears periodic impact load, is easy to generate impact fatigue damage, and the failure of the suction valve becomes an important factor influencing the service life of the piston compressor.

Chinese patent application publication No. CN206738114U, published as 12.12.2017, entitled "piston compressor with good sealing performance", and includes a motor, one end of the motor has a rotating shaft, a crankshaft and a supporting rod, the middle of the supporting rod is connected with a connecting rod, one end of the connecting rod, which is far away from the supporting rod, is connected with a piston, the outer surface of the top end of the piston is provided with a groove, the bottom of the groove is connected with two rows of springs, a supporting column is arranged between the springs, the top end of the supporting column is connected with a piston ring, a rubber ring is arranged above the piston ring, the piston is arranged in a cylinder, one side of the top end of the cylinder is provided with an air inlet, a first air storage chamber and an air suction valve port, one side of the air suction valve port, which is far away from the air inlet, is provided with an air outlet, the second air storage chamber is provided with an exhaust valve. However, the spring air valve structure adopted by the patent still has the problems.

Disclosure of Invention

The invention provides a gas suction structure of a piston compressor, aiming at overcoming the problems that the gas suction valve structure influences the volume efficiency of the compressor and partial gas reflows in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

a gas suction structure of a piston compressor comprises a connecting rod, a rotating shaft and a piston, wherein the connecting rod is rotatably connected with the piston through the rotating shaft; one end of the connecting rod, which is connected with the rotating shaft, is provided with a driving structure, the driving structure is fixed with the connecting rod, and the driving structure comprises an upper driving section, a pressing section and a lower driving section which are sequentially distributed; the upper driving section is provided with an upper arc section which is contacted with the air suction sliding sheet, and the axis of the upper arc section is eccentrically arranged relative to the rotating shaft towards one side of the pressing section; the lower driving section is provided with a lower arc section which is contacted with the air suction sliding sheet, and the axis of the lower arc section is eccentrically arranged relative to the rotating shaft towards one side of the pressing section; the air suction slip sheet is provided with an air vent, the piston is provided with an air suction hole, and the air suction hole is eccentrically arranged on one side of the upward driving section.

In the above technical scheme, the air suction sliding sheet can be made of a material with certain elasticity, so that the sealing performance of the air suction sliding sheet is ensured. The connecting rod drives the piston to move and simultaneously can rotate relative to the piston to a certain degree. When the piston is compressed, in the first half, the connecting rod rotates and drives the air suction slip sheet to slide towards one side of the downward driving section, the air hole in the air suction slip sheet is staggered and far away from the air suction hole in the piston, in the second half, the connecting rod rotates in a reverse direction and drives the air suction slip sheet to slide towards one side of the upward driving section, the air hole in the air suction slip sheet is staggered and close to the air suction hole in the piston, in the whole compression process, the air suction slip sheet is close to one side of the downward driving section, the air hole and the air suction hole are always staggered, the sealing performance in an air cavity is guaranteed, and; when the piston breathes in, first half, the connecting rod rotates and drives the gleitbretter of breathing in and upwards drive section one side motion, the air vent communicates with the back that the suction opening is close to gradually, and connecting rod turned angle is big more, the air vent is big more with the coincidence area of suction opening, latter half, connecting rod counter rotation drives the gleitbretter of breathing in and drive section one side motion downwards, the air vent is kept away from with the suction opening gradually, when the air cavity volume is the biggest, the gleitbretter of breathing in returns to the piston center, the air vent. When the connecting rod and the piston complete a complete stroke, the process of one-time expansion, air suction, compression and air release is just completed, the communication and disconnection of the vent hole and the air suction hole in the whole process are only related to the position of the piston, the automatic opening and closing of the air suction structure are realized, the air suction resistance and the backflow are reduced relative to the air valve structure, the volume efficiency of the compressor is improved, the traditional easily damaged air suction valve is cancelled, and the reliability of the piston compressor is improved. In the compression process, because the gas in the gas chamber can produce the reaction force to the piston, and there is certain clearance between piston and the connecting rod rotation connection, the piston can be close to the connecting rod under the effect of reaction force to press from both sides the gleitbretter of breathing in together with the connecting rod, thereby guaranteed the piston and breathed in the gas tightness between the gleitbretter. The deflection angle of the connecting rod relative to the piston is a, the eccentricity of the upper arc section and the rotating shaft is d, and the displacement ds = d × sin (a) of the suction slide piece.

Preferably, the piston comprises a sealing end face and a receiving cavity; one end of the connecting rod and the air suction sliding sheet are arranged in the accommodating cavity; the air suction hole is arranged on the sealing end face. The structure enables the air suction sliding sheet and the driving structure to be arranged in the piston, and the stability and the compactness of the structure are guaranteed.

Preferably, the piston further comprises a sealing ring wall, a sealing ring groove is formed in the sealing ring wall, and a sealing ring is arranged in the sealing ring groove. The structure can ensure the air tightness when the piston moves.

Preferably, the air suction sliding sheet comprises a supporting portion and a sliding end face, the vent hole is formed in the sliding end face, the driving structure is arranged on the inner side of the supporting portion, and the upper arc section and the lower arc section are respectively in contact with the supporting portion. The structure can ensure that the air suction slip sheet can slide along with the rotation of the connecting rod and can be tightly attached to the piston.

Preferably, the vent hole is eccentrically arranged on one side of the downward driving section. The eccentricity of the vent hole is superposed with the eccentricity of the air suction hole, so that the vent hole and the air suction hole are completely staggered during compression.

Preferably, the sliding end face is provided with an avoidance hole. The avoiding hole has the effects of increasing the displacement distance of the air suction sliding sheet, further increasing the area of the air suction port and reducing the air suction resistance.

Preferably, the suction holes are elongated holes, and the direction in which the elongated holes extend is perpendicular to the sliding direction of the suction vane. The structure can increase the air inlet speed without changing the sliding distance of the air suction slide sheet.

Preferably, the cross section of the pressing section is a section of circular arc, and the center of the circular arc is coincided with the center of the rotating shaft. The structure can guarantee that the compressing section compresses tightly the air suction sliding piece all the time when the connecting rod rotates.

Preferably, the section of the pressing section is a section of curve, the curvature center of the curve is coincident with the center of the rotating shaft, and the curvature radius of the curve is increased progressively from the lower driving section to the upper driving section. When the piston sucks air, one side with smaller curvature radius of the curve is contacted with the air suction sliding sheet, a small gap is formed between the air suction sliding sheet and the piston, the air suction sliding sheet and the piston slide smoothly, abrasion is reduced, and the service life of parts is prolonged; when the piston compresses, the side with the larger curvature radius of the curve contacts with the air suction slip sheet, and the pressing section presses the air suction slip sheet to ensure the air tightness of the air suction structure.

The invention has the beneficial effects that: (1) the air suction structure moves along with the connecting rod and is automatically opened and closed, so that air suction resistance and backflow can be reduced; (2) the traditional vulnerable suction valve is removed, and the volumetric efficiency and the reliability of the piston compressor are improved.

Drawings

FIG. 1 is an exploded view of the present invention;

FIG. 2 is a schematic view of the compressor configuration during suction operation according to the present invention;

fig. 3 is a schematic view of the compressor of the present invention in a compressed state.

In the figure: connecting rod 1, pivot 2, piston 3, sealing end face 3.1, sealed rampart 3.2, hold cavity 3.3, suction opening 3.4, sealed annular groove 3.5, the gleitbretter 4 of breathing in, supporting part 4.1, slip terminal surface 4.2, air vent 4.3, dodge hole 4.4, drive structure 5, upper drive section 5.1, upper arc section 5.1.1, the section of compressing tightly 5.2, lower drive section 5.3, lower arc section 5.3.1.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.