JPH056181U - Scroll compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a scroll compressor capable of preventing the lubricating oil supplied to the thrust bearing from being sucked into the compression chamber. [Structure] An oil sealing means configured by providing a circular seal groove on one of the thrust surface of the orbiting scroll and the thrust surface of the frame, and inserting a seal material that operates by a pressure difference of fluid into the seal groove. Is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to scroll compressors used for air conditioning and freezing.

[0002]

[Prior Art]

 FIG. 7 is a sectional view showing a conventional scroll compressor disclosed in the specification of Japanese Patent Application No. 2-186181 filed by the applicant earlier. In FIG. 7, 1 is a fixed scroll and 2 is a swing. Scroll, 2a is a boss portion of the orbiting scroll, 2b is a thrust surface of the orbiting scroll, 2c is a base plate of the orbiting scroll, 3 is a center shell, 4 is a frame fixed by shrink fitting to the center shell 3, and fixed. The scroll 1 is fixed to the frame 4 by bolting. Reference numeral 5 is an Oldham ring, 6 is a thrust bearing arranged outside the Oldham ring 5, 7 is a slider, 8 is a rocking bearing arranged on the inner peripheral side of the boss portion 2a of the rocking scroll, and 9 is Main shaft, 9a is a vertical hole penetrating the main shaft 9 in the axial direction, 9b is a main shaft eccentric portion, 10 is a subframe fixed to the center shell 3, 11 is a main bearing, 12 is a sub bearing, 13 is a positive displacement pump, 14 is a A rotor 15 is shrink-fitted to the main shaft 9, and a stator 15 is shrink-fixed to the center shell 3. The rotor 14 and the stator 15 constitute an electric motor. 16 is a balancer, 17 is a second balancer, 18 is an oil sump, 19 is a crank chamber having a sufficient space for the boss portion 2a of the orbiting scroll to orbit, and 20 is filled with high temperature and high pressure refrigerant gas. A high pressure chamber, 21 is a low pressure chamber of low temperature and low pressure atmosphere of the suction refrigerant gas, 22 is a space A of the atmosphere of the suction refrigerant gas other than the compression chamber sandwiched by the fixed scroll 1 and the orbiting scroll 2 in the frame 4. Is.

Next, the operation will be described. When the stator 15 is supplied with power, the rotor 14 generates torque and rotates together with the main shaft 9. Next, when the main shaft 9 rotates, the rotational force is transmitted to the orbiting scroll 2 via the slider 7 attached to the main shaft eccentric portion 9b, and the orbiting scroll 2 is guided by the Oldham ring 5 attached to the frame 4, It makes a swirling motion, and based on the well-known compression principle, the volume of the compression chamber between the fixed scroll 1 and the orbiting scroll 2 is gradually reduced, and the compression action is performed. Exhaled into the high pressure chamber 20. Further, the sucked refrigerant gas is sucked into the compression chamber from the lower portion of the frame 4 through the refrigerant gas passage penetrating the inside of the frame 4.

Next, the power supply path of this scroll compressor will be described. The lubricating oil stored in the oil sump 18 is pumped up to the vertical hole 9a by the positive displacement pump 13, a part of which is supplied to the sub bearing 12 and the main bearing 11 through a radial path (not shown), and the rest is the vertical shaft of the main shaft. It is guided to the upper end of the main shaft 9 through the hole 9a. Next, the lubricating oil guided to the upper end of the main shaft 9 lubricates the oscillating bearing 8 and is stored in the crank chamber 19 together with a part of the lubricating oil that lubricates the main bearing 11. Although not shown in the drawings, the crank chamber 19 has an oil discharge passage that opens to the crank chamber 19 on one side and to the low pressure chamber 21 on the other side. The pressure of the fluid in the crank chamber 19 is higher than the pressure of the low pressure chamber 21 and the space A22, that is, the pressure of the sucked refrigerant gas because of the pressure loss generated in the pump action and the oil discharge passage. By the stirring action of the boss portion 2a, it is supplied to the Oldham ring 5 and the thrust bearing 6, and the others are discharged from the oil discharge passage to the low pressure chamber 21 and returned to the oil sump 18 by gravity. The lubricating oil supplied to the Oldham ring 5 returns to the crank chamber 19 again.

[0005]

[Problems to be solved by the device]

 The conventional scroll compressor is configured as described above, and the lubricating oil supplied to the thrust bearing flows out into the space A22 due to the pressure difference and is sucked into the compression chamber, and outside the compressor together with the refrigerant gas of the compressor. If the refrigerant piping is long, the lubricating oil will accumulate in the refrigerant piping and will not return to the compressor from the refrigerant piping. Due to insufficient oil supply to each bearing due to depletion, there were problems such as increased wear of the bearing, seizure, and reduced reliability.

The present invention has been made to solve the above problems, and an object thereof is to obtain a scroll compressor capable of preventing the lubricating oil supplied to the thrust bearing from being sucked into the compression chamber. To do.

[0007]

[Means for Solving the Problems]

 The scroll compressor according to the present invention is provided with an orbital seal groove on either the thrust surface of the orbiting scroll or the thrust surface of the frame, and a seal material that operates by the pressure difference of the fluid is provided in this seal groove. It is equipped with an oil sealing means that is configured by inserting it.

[0008]

[Action]

 In the scroll compressor according to the present invention, a circular seal groove is provided on either the thrust surface of the orbiting scroll or the thrust surface of the frame, and a seal material that operates according to the fluid pressure difference is inserted into this seal groove. By providing the configured oil sealing means, the end surface of the seal material on the side opposite to the groove bottom is pressed against the thrust bearing, and the lubricating oil that lubricates the thrust bearing is prevented from flowing out into the space A.

[0009]

【Example】

 Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 26 is a circumferential seal groove provided outside the thrust surface 2b of the orbiting scroll, and always faces the thrust bearing 6. The thrust bearing 6 is arranged outside the Oldham ring 5. Reference numeral 27 is a seal material having a rectangular cross section, and the width and height of this seal material are smaller than the width and depth of the seal groove 26. FIG. 2 is a view in which the seal material 27 is inserted into the seal groove 26. As shown in FIG. 2, the seal material 27 is made of an elastic material such as a piece of tetrafluoroethylene resin along the seal groove. Since it is inserted, a gap δ is formed in the portion where both end faces face each other. 28 is an oil discharge passage.

Next, the operation will be described. In the scroll compressor shown in this embodiment, the oil supply path is the same as that of the conventional example, but the orbital seal groove 26 provided outside the thrust surface 2b of the orbiting scroll is inserted into the seal groove 26. Due to the presence of the sealing material 27 having a rectangular cross section with a width and height smaller than the width and depth of the sealed sealing groove 26, the fluid in the crank chamber 19 is affected by the action of the pump and the pressure loss in the drain passage 28. Is higher than the pressure of the sucked refrigerant gas in the space A22, a pressure higher than that of the sucked refrigerant gas is generated in the gap between the crank chamber 19 and the bottom surface 26a of the seal groove and the groove bottom end surface 27a of the seal material. The fluid is introduced, and the sealing material 27 inserted as shown in FIG. 3 is pushed down in the seal groove 26 due to the pressure difference, and the pressure acts on the groove bottom side end surface 27a and the inner peripheral side surface 27b of the sealing material. , The outer peripheral side surface 27c of the sealing material 27 Since the outer peripheral side surface 26b of the seal groove and the non-groove bottom side end surface 27d of the seal material are pressed into contact with the thrust bearing 6 integrally formed with the frame 4, the crank chamber 19 and the space A22 are sealed and the thrust The lubricating oil supplied to the bearing 6 does not flow out into the space A22 after the lubrication, and some of them continue to lubricate the thrust bearing 6 as they are, and others return to the crank chamber 19 again to the Oldham ring 5 and the thrust bearing 6. It is either supplied or returns to the sump via an oil drain (not shown).

Further, the sealing material 27 has a clearance δ as shown in FIG. 2. However, when a sealing material having a closed ring is used, the coefficient of thermal expansion of the sealing material 27 generally fluctuates. Since the coefficient of thermal expansion of the scroll 2 is larger than that of the scroll 2, the circumferential expansion of the sealing material 27 causes the clearances in the width and height directions of the sealing groove 26 and the sealing material 27 to be blocked, resulting in malfunction or exceeding the clearance. This is to prevent the situation where the thrust bearing 6 is expanded and the sealing material 27 does not protrude from the sealing groove 26, and the thrust bearing 6 is not fluid-lubricated.

When forming the clearance δ, the amount should be determined in consideration of the operating condition in which the sealing material 27 is most thermally expanded, but under other conditions, there is a slight circumferential clearance. It will exist and be driven. Therefore, as shown in Fig. 4, stepped portions 27e and 27f are formed at both ends of the seal material so that the circumferential clearance is always zero and thermal expansion can be released. , 27f may be overlapped with each other to form a clearance at each tip.

Example 2. Although the orbital seal groove 26 is provided on the thrust surface 2b of the orbiting scroll in the above embodiment, the orbital seal groove 26 is provided on the thrust surface 4a of the frame as shown in FIG. The same effect can be obtained by inserting. In this case, the orbiting seal groove 26 is on the surface of the thrust bearing 6 shown in FIG. 6, and is in contact with the thrust surface 2b (dotted line) of the orbiting scroll while the orbiting scroll 2 makes one revolution (2 The thrust bearing 6 is provided from the outer side within the dashed line).

Further, although the scroll compressors of the low pressure shell type are used in all of the above embodiments, in the case of the scroll compressor of the high pressure shell type, the pressure difference between the crank chamber 19 and the space A22 is the case of the low pressure shell type. Since it is larger, it is more effective than the low pressure shell type.

[0015]

[Effect of the device]

 As described above, according to the present invention, the oil sealing means is formed by providing the circumferential seal groove on one of the thrust surface of the orbiting scroll and the thrust surface of the frame, and inserting the seal material in the seal groove. By providing the seal member, it is possible to prevent the lubricating oil that has lubricated the thrust bearing from flowing out into the space A because the anti-groove bottom side of the seal material is pressed against the thrust bearing, so that the thrust bearing is sucked into the compression chamber. It is possible to reduce the amount of lubricating oil that is used to reduce the outflow of lubricating oil to the outside of the compressor.Also, it is possible to prevent poor lubrication and seizure of each bearing due to oil depletion inside the compressor. There is an effect to be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a thrust surface of the orbiting scroll of FIG.

FIG. 3 is an enlarged cross-sectional view of essential parts showing a state during operation of a seal member of the oil sealing means of FIG.

FIG. 4 is a plan view showing a structure of a sealing material according to another embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view of essential parts showing a scroll compressor according to Embodiment 2 of the present invention.

6 is a plan view illustrating the positions of seal grooves of the oil sealing means of FIG.

FIG. 7 is a cross-sectional view showing a conventional scroll compressor.

[Explanation of symbols]

 1 Fixed scroll 2 Oscillating scroll 2b Thrust surface 4 Frame 4a Thrust surface 5 Oldham ring 6 Thrust bearing 26 Seal groove 27 Seal material

Front page continuation (72) Inventor Katsura Wada 3-18-1, Oga, Shizuoka City Mitsubishi Electric Corporation Shizuoka Factory

Claims (1)

[Claims for utility model registration] Claims: 1. A fixed scroll and an orbiting scroll, which have spiral portions whose winding directions are opposite to each other and are combined through a predetermined eccentric amount, and the orbiting scroll in the axial direction. In a scroll compressor including a supporting frame, an Oldham ring that prevents rotation of the orbiting scroll, and a thrust bearing arranged outside the Oldham ring, whichever of the thrust surface of the orbiting scroll and the thrust surface of the frame is used. A scroll compressor characterized in that an oil sealing means is provided in which a circular seal groove is provided on one side, and a seal material that operates according to a fluid pressure difference is inserted into the seal groove.