JPS6349586Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a rotary vane type gas compressor used in car coolers or other relatively small refrigeration equipment, and in particular improves the mechanism to prevent the chattering phenomenon. Regarding.

Prior art In general, a rotary vane type gas compressor is
As shown in FIG. A compressor main body 6 is formed by rotatably horizontally suspending a rotor 5 having vanes 4, 4, . The space 7 is provided with a casing 9 having one end open for storing lubricating oil 8 under the pressure of the gas discharged from the discharge port of the cylinder chamber. And front head 9
The protruding end of the rotor shaft 5a that protrudes through a is hermetically sealed by a mechanical seal 10, and its end face is connected to a pulley via an electromagnetic clutch 11.

The gas entering the cylinder chamber from the air supply port 9b of the front head 9a through the air supply port 1a of the cylinder 1 flows through each vane 4 as the rotor 5 rotates.
As the gas moves forward and backward, it is compressed into high-pressure gas in each working area, enters the space 7 through the discharge port 1b and the oil separator 13, and is supplied to the outside from the discharge port 9c of the casing 9. .

In the rotary vane type gas compressor as described above, the lubricating oil 8 is pumped through the communication holes formed in the rear and front side blocks 2 and 3 and the cylinder 1 by the discharge pressure of the gas from the cylinder chamber. 14, 15, and 16 provide seal lubrication between the rotor shaft 5a and the bearing portions of both side blocks 2 and 3, and on sliding friction surfaces such as the mechanical seal 10.

Furthermore, the lubricating oil leaking into the cylinder chamber from the sliding surface of the bearing part is transferred to the ring-shaped grooves 5b and 5 formed on the sliding surface of the rotor 5 through the communication holes 20 and 21.
It is supplied under reduced pressure into the slit holding the vanes 4 through b.

The synergistic effect of this hydraulic pressure and the centrifugal force accompanying the rotation of the rotor 5 provides the contact pressure of the vanes against the inner wall of the cylinder, and each vane 4 is pushed up by the same pressure. is starting to work.

However, in the structure as described above, even after the rotor 5 rotates and discharges the compressed gas from the discharge port 1b, as shown in FIG.
Since there is a space a delimited by
For example, if oil mist or liquefied gas is mixed in the gas inside the tank, high pressure is generated to compress the liquid, and this causes the vanes 4 to resist the back pressure of the lubricating oil. It instantly sinks into the rotor 5, and then re-projects against the inner wall surface of the cylinder 1. When this re-projection occurs, a collision sound is generated and causes chattering. On the other hand, if high-pressure lubricating oil is supplied into the slit in order to prevent such chattering, the sliding resistance between cylinder 1 and vane 4 will increase, resulting in severe wear on both, and damage to the prime mover side. This may cause problems such as a heavy load.

Therefore, the inventors of the present invention first applied a back pressure according to the amount of protrusion of the vane, and also devised a gas that applied high back pressure corresponding to the part where high pressure is temporarily applied near the discharge port. Developed a compressor.

As shown in FIG. 4, the rotor 5
A pair of grooves 22, 22, which expand in a fan shape at 180° symmetrical positions around the bearing parts 2a, 3a, on the contact end surface with the
23, 23, and a pair of small holes 24 communicating with the high-pressure communication hole 14 are formed at positions opposite to the vicinity of the discharge hole 1b, and facing the bottom of the slit of the vane 4 passing through these. It is something that

According to the above configuration, back pressure can be applied by the fan-shaped groove with a pressure distribution according to the protrusion amount distribution of the vane, and in the area where the chattering phenomenon occurs, high-pressure lubricating oil is applied to the back surface of the vane through the small hole 24. In order to act, it counteracts the force pushing down the vane, so that no chattering phenomenon occurs.

However, the grooves 22, 22, 2 as described above
The shapes of 3 and 23 are extremely complicated, and even if the end faces are to be sealed, a cam tracing mechanism must be provided, making the machining extremely difficult.

Further, the machining of the small hole 24 is difficult, and it is necessary to drill a diagonal drill hole in order to connect it to the communication hole 14, but if the diameter of the drill hole is made small, it is likely to break. The diameter of the small hole 24 becomes a larger value than the desired diameter. On the other hand, small hole 24
If the diameter is large, there will be no orifice and there will be less pressure drop, so the pressure will tend to be high in this part.
This results in the vane being pressed with a pressure that is extremely large compared to the pressure that causes the chattering;
This was a factor that increased the driving power.

Purpose and structure of the invention This invention was devised in view of the above-mentioned shortcomings of the prior art, and its purpose is to:
It is easy to process, and it applies back pressure to the vane by lowering the hydraulic pressure to counteract the localized high pressure.

In order to achieve the above object, in the present invention, for the contact surface between each side block and the rotor, a first groove concentric with the outer circumferential end surface of the bearing part of the rotor shaft is formed. The medium-pressure lubricating oil seeped from the bearing part is added to the bottom of the slit by the groove, and the groove is concentric with the first groove and communicates with a high-pressure lubricating oil passage, and the vane has a maximum protrusion. A second groove having a diameter corresponding to the side surface of the vane is formed in the end face of each side block, and a communication groove communicating with the bottom of the vane is formed near the discharge port of the second groove. By doing so, high-pressure hydraulic pressure is applied to the bottom of the vane through the second groove in the vicinity of the discharge port.

Embodiment An embodiment of this invention will be described in detail below with reference to FIGS. 5 and 6.

However, in this embodiment, the same reference numerals will be used for the same parts as in the conventional art, and only new parts will be explained using different reference numerals.

5 and 6, the front and rear side blocks 2 and 3 and the cylinder 1 are equipped with conventional first and second cylinders.
Similarly to FIG. 2, high-pressure communication holes 14, 15, and 16 communicating with the lubricating oil 8 are formed, respectively, and each side block 2, 3 has a respective shaft bearing part 2a, 3a and each communication hole. A pair of communication holes 20 and 21 are opened, respectively, to allow the flow of the fluids 14 and 15. Also, the shaft bearing portion 2 of the rotor shaft 5a of each side block 2
Contrary to the conventional case, first grooves 30, 30 are formed concentrically with the bearing portion on the contact end surfaces between a, 3a and the rotor 5.
is formed, and medium pressure lubricating oil is transmitted between the rotor shaft 5a and the bearings 2a, 3a and through the circulation holes 20, 21.
The first groove 30 is applied to the bottom of the slit and acts to press the vane against the inner wall of the cylinder 1.

Note that this first groove 30 is formed on the rotor 5 as in the conventional case.
It may be formed on one side or on both sides.

In addition, second grooves 31, 31 are formed concentrically with the first groove 30 on the end surfaces of each side block 2, 3.
are formed, and each of these grooves 31 communicates with the high-pressure communication holes 14 and 16 via small-diameter communication holes 32 and 32, respectively, at positions where they intersect with the high-pressure communication holes 14 and 16.

The radius of this second groove 31 is smaller than the outer diameter of the rotor 5, and the radius is set so that it is located on the side surface of the vane 4 at the maximum protrusion position of the vane 4. Only side pressure is applied to vane 5, and no back pressure is applied to vane 4.

Further, each discharge port 1 is provided in this second groove 31.
At the formation position b, a pair of communication grooves 33, 33 extending inward are formed, the ends of which are positioned at the bottom of the vane 4 passing near the discharge port 1b.

Function: Therefore, in the gas compressor configured as described above, the lubricating oil 18 is supplied to the high pressure communication holes 14 and 16.
It enters the second groove 31 with its hydraulic pressure lowered through the small-diameter communication hole 32, and acts as side pressure on both sides of the rotor 5.

In addition, the lubricating oil that has entered the second groove 31 passes through the communication groove 33 in a state where the pressure has further decreased, and acts as a force to push up the vane 4 from the bottom of the slit of the vane 4 passing near the discharge port. It counteracts the force pushing down the vane 4 in section a in the figure, and prevents the chattering phenomenon caused by this force. The hydraulic pressure acting as back pressure on the vane 4 is different from that shown in FIG.
Since the pressure drops as it travels from the second groove 31 to the communication groove 33, excessive back pressure is not applied to the vane 4 passing through the discharge port 1b and is limited to an appropriate value.

In this embodiment, the front and rear side blocks 2 and 3 are provided with a chattering prevention function as described above. On the other hand, the rotor 5 tends to have a large frictional resistance against the side blocks 2 and 3 due to its thermal expansion, but according to this embodiment, the frictional resistance can be lowered, the driving power can be further reduced, and the sealing performance can also be improved. .

Effects of the Invention As explained in detail in the examples above, in the gas compressor according to the present invention, when guiding oil to the bottom of the vane, the oil is guided through the middle groove in the first groove without forming a fan-shaped groove. In addition, the hole that communicates with the high-pressure oil passage and introduces the high-pressure oil is also provided at the intersection of the second groove and the high-pressure oil passage, so that it is not machined diagonally and the diameter of the hole is also small. Since the pressure of high-pressure oil drops between the second groove and the communication groove, there is no need to manage it as much as in the past, so the structure is simpler and easier to process than the conventional chattering prevention mechanism, and the vane It is possible to apply back pressure to the vane using hydraulic pressure that appropriately counteracts the force pushing down the vane. Furthermore, with this invention, the sliding friction resistance between the rotor and both side blocks can be reduced, so the driving power is reduced and the sealing performance is improved.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a conventional gas compressor, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is an enlarged sectional view of the vicinity of the discharge port in the conventional example, and Fig. 4 is a conventional gas compressor. End view of the front or rear side block of a gas compressor equipped with a chattering prevention mechanism,
FIG. 5 is an end view of the front or rear side block of the gas compressor according to the present invention, and FIG. 6 is an exploded perspective view of the same cylinder and both side blocks. 1... Cylinder, 2... Front side block, 3... Rear side block, 4... Vane,
5... Rotor, 5a... Rotor shaft, 6... Compressor body, 7... Space, 8... Lubricating oil, 9... Casing, 14, 15, 16, 20, 21... Communication hole, 30 ...First groove, 31...Second groove, 32
...Small diameter communication hole, 33...Communication groove.

Claims (1)

[Scope of utility model registration request] A compressor body comprising a rotor having a plurality of vanes that can move forward and backward in the radial direction and horizontally horizontally suspends the rotor in a cylinder chamber configured by a cylinder and both side blocks attached to both sides of the cylinder; In addition to accommodating the compressor main body, a space is formed at the rear of the rear side block, in which lubricating oil under discharge pressure is stored, and the tip of the rotor shaft of the front rotor is rotatably held. It is equipped with a sealed casing, and at the same time supplies the lubricating oil to each part by discharge pressure, a part of the lubricating oil is forced into the slit of the rotor in which the vane is held, and the cylinder chamber is filled with this oil pressure. In the device for obtaining the contact pressure of the vane against the inner wall, a first groove concentric with the outer circumferential end surface of the bearing portion of the rotor shaft is formed on the contact surface between each side block and the rotor. , applying medium-pressure lubricating oil seeping out from the bearing part from this groove to the bottom of the slit, and a groove that is concentric with the first groove and located on the side surface of the vane at the maximum protrusion position of the vane. A second groove configured as shown in FIG. At the same time, a communication groove communicating with the bottom of the vane is formed in the vicinity of the discharge port of the second groove, so that high-pressure oil pressure can be passed through the second groove in the vicinity of the discharge port. A gas compressor characterized by being added to the bottom of the vane.