CN1928363A - Design scheme for gap-free piston reciprocating compressor - Google Patents

Abstract

A design scheme of a "no backlash" piston reciprocating compressor is based on the basic structure of the traditional piston reciprocating compressor with the largest production and sales volume in the world. It is characterized in that: when the piston (5) is exhausted It can rush out of the cylinder (6) against the exhaust valve plate (3) and enter the high pressure zone (H). At this time, the piston (5), the exhaust valve plate (3) and the suction valve block (4) A "no clearance" state with no geometrical space is formed between them. At the same time, the contact surface of the suction valve block (4) and the top outer side of the piston (5) forms a conical covering sealing structure, so as to sum up the above characteristics , which creates conditions for greatly improving the working compression ratio or exhaust efficiency of the compressor model, making the traditional piston reciprocating compressor technology appear in a new look.

Description

A Design Scheme of "No Backlash" Piston Reciprocating Compressor

Technical field:

The present invention relates to piston compressor technology.

Background technique:

Most of the types of compressors that come out at present are conventional piston reciprocating compressors, which have comprehensive characteristics such as simple manufacture, long service life, and low requirements on materials, which cannot be compared with other types of compressors. It is the main reason why it has been enduring since its inception.

However, its disadvantages are as follows: it is difficult to improve its working compression ratio or exhaust efficiency. And one of the main reasons why it is difficult to improve and stagnate is exactly: it is difficult to improve its "volume" efficiency structurally, that is, to reduce the design efficiency of its "clearance" structurally, and the "clearance" mentioned in the title of the present invention No clearance" design is unimaginable.

Invention content:

Purpose of the present invention: solve the problem of above-mentioned " no backlash " design of existing piston reciprocating compressor.

In order to realize the above-mentioned purpose of the present invention, intend to adopt following technology:

1. In terms of structure: A. When the piston is exhausting, it can push out of the cylinder against the exhaust valve plate; B. The contact surface between the suction valve block that controls the opening and closing of the suction hole and the top of the piston is tapered (easy to achieve no gap); C. when the suction valve block was closed on the top outside of the piston, the upper top of the suction valve block was just in the same plane as the top outside of the piston. ------The above-mentioned exhaust valve plate is positioned on the top position of the cylinder by the elastic pressure of the spring.

2. The key machining method of the present invention: both the suction valve block and the piston in the closed state are subjected to the top grinding of the last process at the same time, so as to ensure that the upper top of the suction valve block and the top outside of the piston are just in the same position. the same plane.

The characteristics that the present invention compares with prior art:

Because the piston of the present invention can press against the exhaust valve plate and rush out of the cylinder, this creates conditions for realizing the "no clearance" design of the present invention, and then creates conditions for greatly improving the working compression ratio or exhaust efficiency of the compressor. conditions.

Description of drawings:

Fig. 1 schematically shows an embodiment of the present invention in a horizontal crankshaft-driven high-power piston compressor.

Figure 2 illustrates the relative positions of pistons, valves and cylinders for the forward (exhaust) operation of the piston of the model of Figure 1 .

Fig. 3 schematically shows the relative positions of the piston, the valve and the cylinder when the piston of the model of Fig. 1 moves backward (suction).

H: high pressure area; W: low pressure area; P: suction hole on top of piston; D: AC motor; 1: cylinder head; 2: spring; 3: exhaust valve plate; 4: suction with tapered contact surface Valve block; 5: piston; 6: cylinder; 7: crankshaft; 8: connecting rod; 9: body; 10: set screw.

Detailed ways:

Figure 1 highlights the structural overview of the "no backlash" design of a crankshaft driven compressor.

As shown in Fig. 2, the piston 5, which is doing compression and exhaust work, squeezes all the compressed high-pressure gas into the high-pressure zone H, and then it continues to rush out of the cylinder 6 against the exhaust valve plate 3, and Enter high pressure zone H. At this time, the geometric space ("clearance") between the piston 5, the conical suction valve block 4 and the exhaust valve plate 3 is not difficult to reach extremely close to "zero", or even equal to "zero". . The stroke of the piston 5 rushing out of the cylinder 6 can usually be controlled at about 1/10 of its effective suction stroke length.

As shown in Figure 3, when the piston 5 retreated into the cylinder 6 completely, the exhaust valve plate 3 positioned by the spring 2 would naturally allow it to be driven by high air pressure to seal the top of the cylinder 6. At this time, the piston 5 is naturally converted into the working state of doing downstream suction work. Due to the effect of pressure difference, the gas in the low-pressure area W is passing through the suction hole P on the top of the piston and pushes away the gas that originally sealed them. The conical suction valve block 4 enters the suction stroke section in the cylinder 6, and as the piston 5 performs suction work, the space in the suction stroke section is finally filled.

Claims (3)

1. A design scheme of "no backlash" piston reciprocating compressor, It is characterized by: A. The piston (5) can press the exhaust valve plate (3) and rush out of the cylinder (6) during exhaust operation; B. The cover contact surface between the suction valve block (4) and the top outside of the piston (5) is tapered; C. When the suction valve block (4) is closed on the top outside of the piston (5), the upper top of the suction valve block (4) is just on the same plane as the top outside of the piston (5). 2. A design scheme of "no backlash" type piston reciprocating compressor as claimed in claim 1, It is characterized by: The exhaust valve plate (3) is positioned on the top position of the cylinder (6) by spring (2). 3. A key machining method of the design of the "no clearance" type piston reciprocating compressor as claimed in claim 1, It is characterized by: Both the suction valve block (4) and the piston (5) in the closed state are ground at the top of the final process at the same time to ensure that: the upper top of the suction valve block (4) and the top outer side of the piston (5) exactly on the same plane.

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