KR100425744B1 - Structure for reducing passage resitance of reciprocating compressor - Google Patents

Abstract

The present invention relates to a structure for reducing the flow resistance of a reciprocating compressor, and the present invention is coupled to the mover of the reciprocating motor to be inserted into the compression space of the cylinder in a straight line, and the suction flow path and the suction port have a height difference therein. And a reciprocating type including a piston for suction and compression of refrigerant gas while linearly reciprocating in a cylinder, and a gas guide tube inserted into the suction passage of the piston to guide the refrigerant gas through the suction port into the compression space. In the compressor, the end of the gas guide tube is formed to be inclined to face the suction port, or a plurality of gas exhaust holes are formed in the middle of the gas guide tube to allow the refrigerant gas to escape. The efficiency of the compressor is reduced by reducing the flow resistance due to the height difference and thereby reducing the suction loss of refrigerant gas. Can increase.

Description

Flow resistance reduction structure of reciprocating compressor {STRUCTURE FOR REDUCING PASSAGE RESITANCE OF RECIPROCATING COMPRESSOR}

The present invention relates to a flow resistance reduction structure that can reduce the flow resistance of the suction gas in the reciprocating compressor, in particular, the end of the gas guide tube formed to face the suction port of the piston so that the suction gas smoothly flows into the suction port. It relates to a structure for reducing the flow path resistance of a reciprocating compressor.

In general, a reciprocating compressor sucks and compresses gas while the piston moves linearly. Such a reciprocating compressor converts the rotational motion of the drive motor into a reciprocating motion of the piston and sucks and compresses the gas. There is a way to inhale and compress the gas by reciprocating the piston during the movement.

Figure 1 is a longitudinal sectional view showing an example of a conventional reciprocating compressor belonging to the latter, as shown in the conventional reciprocating compressor is a casing 10 for communicating the gas suction pipe (SP) and gas discharge pipe (DP) and the installation; And a frame unit 20 elastically installed in the casing 10, a reciprocating motor 30 fixed to the frame unit 20 and the mover 33 reciprocates linearly, and a reciprocating motor. The compression unit 40 coupled to the mover 33 of the support unit 30 and supported by the frame unit 20 and the mover 33 of the reciprocating motor 30 are resiliently supported in the movement direction for resonant movement. It includes a resonant spring unit 50 for inducing.

The compression unit 40 is coupled to the cylinder 41 fixed to the frame unit 20 and the mover 33 of the reciprocating motor 30 to reciprocate in the compression space P of the cylinder 41. Discharge of compressed gas while opening and closing the compressed space P by mounting the piston 42, the suction valve 43 attached to the tip of the piston 42 to limit the intake of refrigerant gas, and mounted on the discharge side of the cylinder 41. It consists of a discharge valve assembly 44 to limit the.

The piston 42 has an intake passage 42a formed therein in the axial direction to a predetermined depth in the axial direction, and the front end portion is composed of a suction passage 42b communicating with the inside of the suction passage 42a and penetrating to the front end surface.

The suction port 42b has a different position depending on the shape and the fixed position of the suction valve 43. As shown in FIG. 2, the suction port 43b forms a fixed portion 43a of the suction valve 43 at the center of the valve and In the case where 43b) is formed at the edge, a plurality of suction holes 42b are also formed at the edge of the front end face of the piston 42 so as to be somewhat eccentric with the center of the suction passage 42a.

On the other hand, as shown in Figure 3 in order to induce the suction of the refrigerant gas, the gas guide pipe 45 is inserted into the suction flow path 42a of the piston 42, in this case, the gas guide pipe 45 is a piston ( A large diameter tube portion 45a fixed to the rear end surface of 42) and a small diameter tube portion 45b extending from the large diameter tube portion 45a and inserted deeply and concentrically into the intake passage 42a.

In the figure, reference numeral 42c is a caulking groove, 43c is a bolt through hole, B is a fastening bolt.

The conventional reciprocating compressor as described above operates as follows.

That is, when a flux is formed between the outer stator 31 and the inner stator 32 by applying power to the reciprocating motor 30, the gap between the outer stator 31 and the inner stator 32 is formed. As the placed mover 33 moves in the direction of the flux, the reciprocating motion is continuously reciprocated by the resonant spring unit 50, and together with the piston 42 reciprocating in the cylinder 41, the compression space P ) Volume is changed, and a series of processes of suction and compression of the refrigerant gas into the compression space P are repeated.

At this time, the refrigerant gas is sucked into the casing 10 through the gas suction pipe SP, and when the piston 42 performs the suction stroke, the large diameter pipe portion 45a and the small diameter pipe portion 45b of the gas guide pipe 45 are sucked. ) Was rapidly introduced into the compression space P of the cylinder 41 through the opening and closing portion 43b of the suction valve 43 while sequentially passing through the suction passage 42a and the suction port 42b.

However, in the conventional reciprocating compressor as described above, the opening and closing portion 43b may be damaged while the opening and closing portion 43b of the suction valve 43 is repeatedly opened and closed. In view of this, in order to reduce the internal stress and fatigue breakdown of the suction valve 43, the position of the suction port 42b is located at the edge of the piston, but this causes the suction channel 42a and the suction port ( As 42b) is mismatched in the axial direction, the refrigerant gas passing through the small diameter pipe portion 45b of the gas guide pipe 45 mostly hits the end of the suction passage 42a of the piston 42 and then flows into the suction port 42b. There was a problem that the compressor efficiency is lowered due to the flow path resistance of the suction gas.

The present invention has been made in view of the problems of the conventional reciprocating compressor as described above, the reciprocating compressor that allows the refrigerant gas passing through the gas guide tube to be smoothly sucked into the compression space of the cylinder through the suction port of the piston. It is an object of the present invention to provide a flow resistance reduction structure of.

1 is a longitudinal sectional view showing an example of a conventional reciprocating compressor.

Figure 2 is an exploded perspective view of the piston and the suction valve of the conventional reciprocating compressor.

Figure 3 is a longitudinal sectional view showing the flow of the refrigerant gas when the gas guide tube provided with a piston in the conventional reciprocating compressor.

Figure 4 is a longitudinal sectional view showing the flow of the refrigerant gas when the gas guide tube provided in the piston in the reciprocating compressor of the present invention.

FIG. 5 is a detailed view showing part “A” of FIG. 4;

6 and 7 are longitudinal cross-sectional view showing a modification of the gas guide tube in the reciprocating compressor of the present invention.

** Description of symbols for the main parts of the drawing **

110: piston 111: suction flow path

112: suction port 120: suction valve

130: gas guide 132: small diameter tube

132a: slope 133: gas exhaust hole

134: breaker

In order to achieve the object of the present invention, it is coupled to the mover of the reciprocating motor to be inserted into the compression space of the cylinder in a straight line, and the suction flow path and the suction passage are formed in succession through the inside of the cylinder with a height difference therein. A reciprocating compressor including a piston for suction-compressing refrigerant gas while reciprocating in a straight line, and a gas guide tube inserted into a suction passage of the piston to guide refrigerant gas through a suction port into a compressed space, the end of the gas guide tube It provides a structure for reducing the flow path resistance of the reciprocating compressor to be inclined so as to face the suction port.

In addition, there is provided a flow path resistance reduction structure of the reciprocating compressor, characterized in that a plurality of gas exhaust holes are formed in the middle of the gas guide tube so that the refrigerant gas escapes.

EMBODIMENT OF THE INVENTION Hereinafter, the flow path resistance reduction structure of the reciprocating compressor by this invention is demonstrated in detail based on one Example shown in an accompanying drawing.

Figure 4 is a longitudinal sectional view showing the flow of the refrigerant gas when the piston is provided with a gas guide tube in the reciprocating compressor of the present invention, Figure 5 is a detailed view showing part "A" of FIG.

As shown in the drawing, the flow resistance reduction structure of the reciprocating compressor according to the present invention forms a tip of the gas guide tube that guides the refrigerant gas into the compression space of the cylinder to be inclined toward the suction port so that the refrigerant gas is smoothly sucked. .

In FIG. 4, 110 shows a piston, which is coupled to the mover of the reciprocating motor (shown in FIG. 1) 30 and slides into the compression space of the cylinder (shown in FIG. 1) 41. The suction passage 111 is inserted into the suction passage 111 to a predetermined depth in the movement direction, and the suction passage 112 is formed inside the suction passage 111 to open and close by the suction valve 120. do.

The suction flow path 111 is formed to match the diameter of the piston 110 concentrically, and the suction port 112 may be formed differently depending on the shape of the suction valve 120, but the center as in the present embodiment In the case of the fixed suction valve, at least one of the inlet valves 122 is formed at the edge of the front end surface to make the length of the opening and closing portion 122 of the suction valve 120 as long as possible. That is, the suction port 112 is preferably formed to have a constant height difference with the axis center of the suction flow path (111).

The gas guide tube 130 is a large diameter tube portion 131 fixed to the rear end surface of the piston 110, and a small diameter extending long into the suction passage 111 of the piston 110 integrally or post-assembled with the large diameter tube portion 131. Consists of the tube 132.

The small diameter pipe portion 132 is formed at the end of the inclined surface 132a, but the inclined direction is preferably formed to be inclined toward the suction port 112 so that the refrigerant gas is directed toward the suction port 112 of the piston 110. .

The passage resistance reduction structure of the reciprocating compressor of the present invention as described above has the following effects.

That is, by applying power to the reciprocating motor (not shown), the mover reciprocates in a straight line, and the piston 110 connected to the mover sucks and compresses the refrigerant gas while reciprocating in the compression space of the cylinder. The process of discharging is repeated.

Here, the suction passage 111 and the suction passage 112 are formed in the piston 110, and the suction passage 111 of the piston 110 is equipped with a gas guide tube 130 for guiding the refrigerant gas directly into the compression space As the refrigerant gas passing through the gas suction pipe (shown in FIG. 1) SP is not diffused into the casing of the compressor, the refrigerant gas is directly sucked into the compression space of the cylinder through the gas guide pipe 130 and the suction port 112. . This prevents the refrigerant gas from being overheated by motor heat or the like before the suction of the refrigerant gas into the compression space, thereby increasing the compressor volume.

At this time, the suction passage 111 penetrates the center of the piston 110 while the suction passage 112 is eccentrically formed at the edge, so that a height difference occurs between the suction passage 111 and the suction passage 112 and this height is increased. Although a stepped surface is formed at the connection portion between the suction flow path 111 and the suction port 112 by the car, the flow resistance of the refrigerant gas sucked in the linear direction through the gas guide pipe 130 may increase, but the gas guide pipe ( As the end of the 130 is formed to be inclined toward the suction port 112, the refrigerant gas is sucked into the compression space while being bent toward the suction port 112 at the outlet of the gas guide tube 130.

In this way, the flow resistance generated as the refrigerant gas passes through the piston reduces the suction loss, thereby increasing the compressor efficiency.

On the other hand, if there is another embodiment of the flow resistance reduction structure of the reciprocating compressor according to the present invention is as follows.

That is, in the above-described embodiment, the end of the gas guide tube is formed to be inclined to reduce the flow resistance, but this embodiment shows the gas exhaust hole 133 in the middle of the gas guide tube 130 as shown in FIG. 6. To form a number of.

The gas exhaust hole 133 is preferably formed to be inclined in the direction toward the suction port 112 as possible.

In this case, as shown in FIG. 7, the blocking part 134 is formed at the end of the suction port 112 to allow the refrigerant gas to be sucked through the gas exhaust hole 133 to be sucked in the piston 110. Can further reduce the flow path resistance.

In this way, the refrigerant gas passing through the gas guiding pipe is discharged at the end at a time and prevents it from hitting the step surface between the suction passage and the suction passage, while simultaneously leaking into the suction passage and being driven into the suction passage. It is to reduce the flow resistance of the gas.

In the present embodiment, since the above-described embodiment and its operation and effect are substantially the same, a detailed description thereof will be omitted.

In the flow resistance reduction structure of the reciprocating compressor according to the present invention, the end of the gas guide tube for guiding the refrigerant gas directly into the compression space is formed to be inclined toward the suction port of the piston, or the gas exhaust hole is formed in the middle of the gas guide tube. By allowing the refrigerant gas to flow smoothly toward the suction port, the flow resistance due to the height difference between the suction channel and the suction port of the piston can be reduced, thereby reducing the suction loss of the refrigerant gas, thereby increasing the efficiency of the compressor.

Claims (4)

It is coupled to the mover of the reciprocating motor and slides straight into the compression space of the cylinder, and passes through the suction channel and the suction port with a height difference therebetween. A reciprocating compressor comprising a piston for suction compression and a gas guide tube inserted into a suction flow path of a piston to guide refrigerant gas through a suction port into a compression space, A flow path resistance reduction structure of a reciprocating compressor, characterized in that the end of the gas guide tube is formed to be inclined to face the suction port. It is coupled to the mover of the reciprocating motor and slides straight into the compression space of the cylinder, and passes through the suction channel and the suction port with a height difference therebetween. A reciprocating compressor comprising a piston for suction compression and a gas guide tube inserted into a suction flow path of a piston to guide refrigerant gas through a suction port into a compression space, A flow path reducing structure of a reciprocating compressor, characterized in that a plurality of gas exhaust holes are formed in the middle of the gas guide tube so that the refrigerant gas escapes. The method of claim 2, Gas exhaust hole noise reduction device of the reciprocating compressor, characterized in that formed inclined toward the suction port. The method according to claim 2 or 3, A passage resistance reduction structure of a reciprocating compressor, characterized in that the end of the suction port side of the gas guide tube is blocked.