TWM513933U - Spiral compressor and its seal mechanism thereof - Google Patents

Description

Screw compressor and its shaft sealing mechanism

The present invention relates to a shaft sealing mechanism, and more particularly to a screw compressor and a shaft sealing mechanism thereof, which can effectively achieve a lubrication chamber that blocks the lubrication of lubricating oil.

Since screw compressors have been widely used for fluid pressurization, the fluid is brought to a high pressure state for use by the client equipment or units. In particular, there is a dry oil-free screw compressor in which no medium (lubricating oil or a mixture thereof) is cooled or sealed except for compressed gas in its compression chamber. The cylinder system of the existing dry oil-free compressor does not need lubricating oil during the compression process, so it does not have oily smell, no oil pollution, and does not need oil change maintenance from time to time, so it can be applied to food, medical and other fields. in.

Although there is no medium in the dry oil-free compressor, the bearing still contains lubricating grease. During long-term and high-speed operation of the compressor, there is still a small amount of grease infiltrated into the compression chamber; or, due to the increase in temperature, the grease evaporates and oxidizes and decomposes. As the high-pressure fluid enters the compression chamber, a shaft seal must be disposed. Agency 10. As shown in FIG. 1, the conventional oil-free screw compressor shaft seal mechanism 10 is characterized in that the shaft seal mechanism 10 disposed on the spiral rotor 20 includes an oil seal 30 assembly and a gas seal assembly 50. As shown, the oil seal assembly 30, the gas seal assembly 50, and the compression chamber 70, which are ball or roller bearings 32, are sequentially arranged from the synchronizing gear 40 to the left. The plurality of air seal assemblies 50 further include a floating ring 52, a wave spring 54, The float ring seat 56 and the vent hole 58 disposed between the two float ring seats 56. In addition, a slinger 60 may be provided on one side of the ball or roller bearing 32 to form a low pressure region while a labyrinth ring 62 is disposed to block the lubricating oil gas from contaminating the helical compression chamber 70.

However, the conventional bearing mechanism 10 is provided with a plurality of sets of the air-sealed bearings 50, which causes the spiral rotor 20 to have a long axial direction and inconvenient assembly. Therefore, there is a need for improvement in the problems of the above-mentioned shaft sealing mechanism.

One of the purposes of the present invention is to provide a screw compressor and a shaft sealing mechanism which have fewer components (simplified structure), improved shaft seal performance, and shortened axial seal length of the spiral rotor.

Another object of the present invention is a screw compressor and a shaft sealing mechanism that can relatively reduce the volume of the compressor.

To achieve the above object, the present invention provides a shaft sealing mechanism disposed between a casing and a spiral rotor relative to the casing. The shaft sealing mechanism includes a labyrinth ring shaft seal and an O-ring. The labyrinth ring seal includes a body disposed along the axial direction of the spiral rotor and a vent hole extending through the body in a radial direction. The O-ring is placed on the outer surface of the labyrinth ring seal.

Another broad aspect of the present invention also provides a screw compressor including a casing, at least one helical rotor, and the shaft sealing mechanism of the foregoing embodiment. The casing is formed with a compression chamber. The spiral rotor is disposed in the casing and passes through the compression chamber, wherein the helical rotor has at least one shoulder and a reverse helical tooth abutting the shoulder. The shaft sealing mechanism is disposed on the casing and disposed relative to the spiral rotor.

Preferably, a rolling bearing and a slinger adjacent to the labyrinth ring seal are further included, wherein the slinger is disposed between the labyrinth ring seal and the rolling bearing.

Preferably, the body further has a continuous reverse spiral tooth on a side of the spiral rotor, and the toothed direction of the reverse helical tooth is further disposed toward the rolling bearing.

Preferably, the outer surface of the labyrinth ring shaft seal further forms a groove for arranging the O-ring, and the groove is formed at a central position of the body.

Preferably, the number of vent holes includes a pair, the number of the O-rings includes a pair, and each of the O-rings is symmetrically disposed on two sides of the body, and the vent holes are respectively formed on the pair of O-types. Between the rings.

100‧‧‧ shaft sealing mechanism

102‧‧‧Shell

110‧‧‧Spiral rotor

112‧‧‧ shoulder

120‧‧‧Maze ring shaft seal

122‧‧‧ Groove

130‧‧‧ Ontology

140‧‧‧ venting holes

150‧‧‧O-ring

160‧‧‧ rolling bearings

170‧‧‧Rearring ring

180‧‧‧Reverse helical teeth

200‧‧‧Spiral compressor

202‧‧‧Throwing hole

210‧‧‧Compression chamber

220‧‧‧Reverse helical teeth

1 is a cross-sectional view showing a shaft sealing mechanism of a conventional screw compressor.

2 is a cross-sectional view showing the shaft sealing mechanism of the inventive screw compressor.

Figure 3 is an enlarged view of a portion A of Figure 2.

4 is a second embodiment of the present invention.

FIG. 5 is a third embodiment of the present invention.

FIG. 6 is a fourth embodiment of the present invention.

FIG. 7 is a view showing another specific embodiment of the reverse spiral tooth of the present invention.

The detailed description and technical content of the present invention are described below with reference to the drawings, but the drawings are only for reference and explanation, and are not intended to limit the creation.

As shown in FIGS. 2 and 3, the present invention provides a shaft sealing mechanism 100 disposed between a casing 102 and a helical rotor 110 relative to the casing 102. That is, the shaft sealing mechanism 100 is preferably fixed to the casing 102, and the helical rotor 110 is rotated relative to the shaft sealing mechanism 100. As shown, the shaft seal of this embodiment The mechanism 100 includes a labyrinth ring seal 120 and an O-ring 150. The labyrinth ring seal 120 includes a body 130 disposed axially of the spiral rotor 110 and a venting opening 140 extending through the body 130. The O-ring 150 is disposed on the outer surface of the labyrinth ring seal 120.

As shown in FIG. 3, the outer surface of the labyrinth ring shaft seal 120 further defines a recess 122 for arranging the O-ring 150, and the recess 122 is preferably formed at a central position of the body 130 to form an elongated labyrinth ring shaft. The seal 120 is disposed on the casing 102 with respect to the spiral rotor 110 without offset to ensure the accuracy of sealing and positioning. The O-ring 150 described herein is to prevent oil or gas from leaking between the labyrinth ring seal 120 and the housing 102. The vent hole 140 can be opened on either side of the O-ring 150 without limitation.

The number of the vent holes 140 may also be a pair or more. In the embodiment shown in FIG. 4, the two vent holes 140 may be symmetrically or asymmetrically opened on both sides of the O-ring 150 to enable the fluid to Discharge quickly. In addition, the number of O-rings 150 may also include one or more, and is not limited. In the embodiment shown in FIG. 5, the two O-rings 150 are preferably symmetrically disposed on opposite sides of the body 130, so that the labyrinth ring seal 120 is disposed on the casing 102 with respect to the spiral rotor 110 without being offset. The venting holes 140 may be separately formed between the O-rings 140, or may be opened in pairs (or above) between the O-rings 150, as shown in FIG.

Referring to FIG. 2 to FIG. 6 together, the present invention further includes a rolling bearing 160 adjacent to the labyrinth ring shaft seal 120 and a slinger 170, wherein the slinger 170 is disposed between the labyrinth ring shaft seal 120 and the rolling bearing 160 . As shown in the figure, the rolling bearing 160 and the slinger 170 which are lubricated and cooled by the oil mist method are respectively fixed to the spiral rotor 110. When the spiral rotor 110 rotates at a high speed under the support of the bearing mechanism 100, the oil slinger 170 strengthens the barrier oil and gas into the immediately adjacent labyrinth ring shaft seal 120 by the centrifugal force, and causes the slinger 170 to form a low pressure region. The rolling bearing 160 described herein can be a ball bearing, a roller bearing or other suitable bearing.

In the present embodiment, the body 130 further has a continuous reverse helical tooth 180 on a side of the helical rotor 110, wherein the toothed direction of the reverse helical tooth 180 is further disposed toward the rolling bearing 160 so that the oil and gas can be opposite to the compression chamber 210. Send in the direction. That is to say, due to the rotational inertia of the spiral rotor 110, the arrangement of the reverse helical teeth 180 can drive the gas in the gap (not labeled) between the labyrinth ring shaft seal 120 and the helical rotor 110 away from the compression chamber 210, thereby effectively blocking the lubricating oil gas. Contamination, in turn, improves the performance of the shaft seal mechanism 100 of the present invention (better).

In addition, the labyrinth ring seal 120 extends upright through one or more exhaust holes 140 of the body 130, so that the gas in the compression chamber 210 can only be discharged to the outside, and the layer of barrier rolling bearing 160 is added to the compression chamber 210. The shaft sealing mechanism 100 can ensure that there is no possibility of contamination of the lubricating oil in the compression chamber 210 of the dry oil-free screw compressor 100.

Referring to FIG. 2 to FIG. 7 together, another generalized embodiment of the present invention further provides a screw compressor 200 including a casing 102, at least one spiral rotor 110, and the shaft sealing mechanism 100 of the foregoing embodiment. . The casing 102 is formed with a compression chamber 210. The spiral rotor 110 is disposed in the casing 102 and passes through the compression chamber 210. The spiral rotor 210 has at least one shoulder portion 112 and a reverse spiral tooth 220 adjacent to the shoulder portion 112, as shown in the figure. 7 is shown. The reverse helical teeth 220 described herein are preferably disposed relative to one side of the labyrinth ring seal 120.

The difference between this embodiment and the foregoing embodiment lies in the position where the reverse helical teeth 220 are disposed, but the effects achieved are the same. In addition, the slinger 170 is more resistant to the shoulder 112, and the casing 102 is also formed with a slinger 202 adjacent to the slinger 170 to facilitate the discharge of oil and gas out of the atmosphere. Since the spiral rotor 110 has a shoulder portion 112 having a small diameter, the lubricating oil of the rolling bearing 160 is less likely to penetrate into the gap (not shown) between the labyrinth ring shaft seal 120 and the spiral rotor 110 along the outer surface of the spiral rotor 110 to block The oil and gas enters the adjacent compression chamber 210. Furthermore, the oil and gas or fluid in the gap can be sealed by the labyrinth ring 120 is provided to discharge one or more vent holes 140 to the outside. Therefore, the present invention utilizes the shaft sealing mechanism 100 and the shoulder portion 112 which are layered to block the lubricating oil gas, and is designed to enter the compression chamber 210, thereby effectively increasing the reliability of the creation.

Therefore, the shaft sealing mechanism 100 of the present invention has fewer components (simplified structure), and the shaft sealing performance is improved by providing the reverse helical teeth 180, 210, and the axial sealing length of the spiral rotor is shortened, thereby further reducing the volume of the screw compressor 200. .

In summary, the embodiments disclosed herein are to be considered as illustrative of the present invention and are not intended to limit the present invention. The scope of this creation is defined by the scope of the appended patent application and covers its legal equivalents and is not limited to the foregoing description.

100‧‧‧ shaft sealing mechanism

102‧‧‧Shell

110‧‧‧Spiral rotor

112‧‧‧ shoulder

120‧‧‧Maze ring shaft seal

122‧‧‧ Groove

130‧‧‧ Ontology

140‧‧‧ venting holes

150‧‧‧O-ring

160‧‧‧ rolling bearings

170‧‧‧Rearring ring

180‧‧‧Reverse helical teeth

200‧‧‧Spiral compressor

202‧‧‧Throwing hole

Claims (10)

A shaft sealing mechanism is disposed between a casing and a spiral rotor relative to the casing, the shaft sealing mechanism comprising: a labyrinth ring shaft seal, including a body and a radial passage disposed along the axial direction of the spiral rotor An exhaust hole of the body; and an O-ring disposed on the outer surface of the labyrinth ring seal. The shaft sealing mechanism of claim 1, further comprising a rolling bearing and a slinger adjacent to the labyrinth ring seal, wherein the slinger is disposed between the labyrinth ring seal and the rolling bearing. The shaft sealing mechanism of claim 2, wherein the rolling bearing is a ball bearing or a roller bearing. The shaft sealing mechanism of claim 2, wherein the body further has a continuous reverse helical tooth with respect to a side of the helical rotor, the toothed direction of the reverse helical tooth being further disposed toward the rolling bearing. The shaft sealing mechanism of claim 1, wherein the outer surface of the labyrinth ring seal further forms a groove for arranging the O-ring, and the groove is formed at a central position of the body. A shaft sealing mechanism according to claim 1, wherein the body is laterally fixed to the casing, the spiral rotor is rotated relative to the body, and the vent hole extends through the body upright. The shaft sealing mechanism of claim 1, wherein the number of the vent holes comprises a pair, the number of the O-rings includes a pair, and each of the O-rings is symmetrically disposed on two sides of the body, each of the exhausts Holes are formed between the pair of O-rings, respectively. A screw compressor comprising: a casing, forming a compression chamber; At least one helical rotor disposed in the housing and passing through the compression chamber, wherein the helical rotor has at least one shoulder and a reverse helical tooth adjacent the shoulder; and as claimed in any one of claims 1 to 7 The shaft sealing mechanism is disposed on the casing and disposed relative to the spiral rotor. The screw compressor of claim 8, further comprising a rolling bearing and a slinger adjacent to the labyrinth ring seal, wherein the slinger is disposed between the labyrinth ring seal and the rolling bearing, wherein the reverse spiral The teeth are disposed relative to a side of the labyrinth ring seal. The screw compressor of claim 9, wherein the oil slinger is in contact with the slinger, and the casing is further formed with a slinger adjacent to the slinger.