JPH0738690U - Rotary helium compressor - Google Patents

Abstract

(57) [Summary] [Object] To provide a rotary helium compressor capable of sufficiently cooling a compression element by improving a cooling effect of lubricating oil by cooling water of a cooling jacket. A structure in which a cooling jacket 17 for cooling a lubricating oil pipe 16 with a cooling water pipe 18 is mounted around a hermetically sealed case 2 of a rotary helium compressor 1 which uses helium gas as a refrigerant, with a minute gap S therebetween. Is.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary helium compressor used in refrigerators and air conditioners, and more particularly to a rotary helium compressor with an improved cooling jacket mounting structure.

[0002]

[Prior art]

 In recent years, rotary helium compressors that use helium gas as a refrigerant instead of CFC gas have attracted attention. This rotary helium compressor will be described with reference to FIGS. 3 and 4 according to this embodiment. As shown in FIG. 3, in the hermetic case 2 of the rotary helium compressor 1, the electric element 4 provided on the upper end side of the crankshaft 3 is accommodated and provided on the lower end side of the crankshaft 3. A compression element 5 is housed therein.

When power is received by the power receiving terminal 6 provided on the upper portion of the hermetically sealed case 2, the rotating magnetic field of the stator 7 forming the electric element 4 causes the rotor 8 provided therein to rotate. The crankshaft 3 of the rotor 8 is rotatably supported by a main bearing 9 and a sub-bearing 10 provided on the compression element 5. A cylinder chamber 12 is defined inside the cylinder block 11 sandwiched between the main bearing 9 and the sub bearing 10, and the eccentric portion 3a of the crank shaft 3 is accommodated in the cylinder chamber 12. An eccentric roller 13 is fitted in the eccentric portion 3a, and a blade 14 reciprocating in a blade groove (not shown) comes into contact with the eccentric roller 13 to move the cylinder chamber 12 to a low pressure side and a high pressure side. It is divided into two parts. Helium gas as a refrigerant is sucked into the cylinder chamber 12 through the suction pipe 15, and is compressed by the rotation of the eccentric roller 13 changing the volume in the cylinder chamber 12.

By the way, since the helium gas has a large specific heat ratio and therefore generates a large amount of heat by compression, it is necessary to cool the compression element 5. Therefore, the lubricating oil stored in the bottom portion of the closed case 2 is passed through the lubricating oil pipe 16 to the compression element 5 due to the pressure difference between the internal pressure of the closed case 2 and the cylinder chamber 12 (case internal pressure> cylinder internal pressure). Cooling by flowing in. As shown in FIG. 4, the lubricating oil pipe 16 is provided on a cooling jacket 17, and the cooling water pipe 18 is brought into contact with the lubricating oil pipe 16 to cool the lubricating oil passing through the inside thereof. And the cooling water pipes 18 are arranged so as to meander alternately. The cooling jacket 17 is mounted so that the inner peripheral surface of the cooling jacket 17 is in close contact with the outer peripheral surface of the portion of the sealed case 2 corresponding to the electric element 4 so that heat generation of the electric element 4 can be suppressed. Was there. Specifically, this cooling jacket 17 is in the shape of a half-cylindrical body, and the fixing bolts 20 are fastened to the flat plate-shaped flange portions 19 formed on both end edges of the cooling case 17 to fix the closed case 2. It was mounted on the outer peripheral surface of the portion corresponding to the electric element 4.

[0005]

[Problems to be solved by the device]

 By the way, in the conventional rotary helium compressor, most of the inner peripheral surface of the cooling jacket 17 is in close contact with the outer peripheral surface of the closed case 2, so that the cooling water passing through the cooling water pipe 18 of the cooling jacket 17 is cooled. Most of the cooling effect of water is spent on cooling the electric element 4, and as a result, the lubricating oil is not cooled, so that the compression element 5 is not sufficiently cooled.

Therefore, if the heat generation of the helium gas is not suppressed, the lubricating oil may be carbonized, and if the carbide adheres to the discharge valve, the discharge valve may be damaged.

In view of the above problems, an object of the present invention is to provide a rotary helium compressor capable of sufficiently cooling the compression element by improving the cooling effect of the lubricating oil by the cooling water of the cooling jacket. It is in.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the rotary helium compressor according to the present invention uses helium gas as a refrigerant, and is equipped with a cooling jacket for cooling a lubricating oil pipe with a cooling water pipe around a closed case. In the compressor, the cooling jacket is attached to the closed case through a minute gap.

[0009]

[Action]

 According to the above configuration, the cooling jacket is mounted around the sealed case so that a minute gap is formed between the cooled jacket and the sealed case. Therefore, the inner peripheral surface of the cooling jacket and the outer peripheral surface of the sealed case. The contact area with the surface is smaller than before.

Therefore, the minute gap suppresses cooling of the electric element portion by the cooling water pipe of the cooling jacket, and as a result, the cooling effect of the lubricating oil in the lubricating oil pipe by the cooling water pipe is improved, and the lubrication thereof is suppressed. The oil will provide sufficient cooling of the compression element.

[0011]

【Example】

 Hereinafter, a preferred embodiment of the rotary helium compressor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a front vertical sectional view showing an embodiment of the rotary helium compressor. As shown in the figure, in the sealed case 2 of the rotary helium compressor 1 of this embodiment, an electric element 4 is housed in the upper part and a compression element 5 is housed in the lower part. Lubricant oil is stored in the bottom of the closed case 2.

The electric element 4 is provided with a stator 7 fixed to the closed case 2 and a rotor 8 located inside the stator 7 with a predetermined gap. The rotor 8 is fixed to the upper end side of a crankshaft 3 which is rotatably supported by a main bearing 9 and a sub-bearing 10 provided on the compression element 5. A power receiving terminal 6 for receiving power from a power source (not shown) and supplying the power to the stator 7 is provided on the upper portion of the closed case 2.

The compression element 5 is provided with a ring-shaped cylinder block 11 fixed to the closed case 2, and the cylinder block 11 is sandwiched between the main bearing 9 and the sub-bearing 10. Due to this, a cylinder chamber 12 is defined and formed inside thereof. The eccentric portion 3a of the crankshaft 3 supported by the main bearing 9 and the sub bearing 10 is accommodated in the cylinder chamber 12. An eccentric roller 13 is fitted to the eccentric portion 3a so as to surround the eccentric portion 3a, and a blade 14 that partitions the cylinder chamber 12 into a low pressure side and a high pressure side contacts the outer peripheral portion of the eccentric roller 13a. It is like this. The blade 14 is provided in a blade groove (not shown) opened in the cylinder block 11 to face the inside of the cylinder chamber 12, and is elastically supported so as to be reciprocally movable along the blade groove. . A suction pipe 15 for supplying helium gas into the cylinder chamber 12 is connected to the cylinder block 11.

Further, as shown in FIGS. 3 and 4, one end of a lubricating oil pipe 16 is connected to the lower part of the hermetically sealed case 2 so as to face the compression element 5, and the other end is lubricated with oil. Is connected to the bottom of the closed case 2 in which is stored.

Then, as shown in FIGS. 3 and 5, a cooling jacket for cooling the lubricating oil passing through the lubricating oil pipe 16 is provided around the portion of the closed case 2 corresponding to the electric element 4. 17 is attached. Lubricating oil pipes 16 and cooling water pipes 18 for cooling the lubricating oil pipes 16 are provided in the cooling jacket 17 so as to alternately meander. Further, the cooling water of the cooling water pipe 18 that has passed through the cooling jacket 17 further passes through a loop-shaped cooling water pipe 18a provided in the lubricating oil in the lower part of the case 2 to cool the lubricating oil.

As shown in FIG. 2, the cooling jacket 17 is formed by combining split jackets 17a and 17b each having a half-cylindrical shape, and the split jackets 17a and 17b each have a different shape at each end. Flange portions 19a and 19b are formed. Specifically, one flange portion 19a has a flat plate shape, and the other flange portion 19b has a bent angle shape. The divided jackets 17a and 17b are combined so that the flange portions 19a and 19b having the same shape face each other, and the fixing bolt 20 is fastened to the abutted flange portions 19a and 19b. The initial shape of the split jackets 17a and 17b is formed so that the surface that contacts the closed case 2 is slightly larger than the outer radius of the closed case 2 so that the split jackets 17a and 17b can be easily attached to the closed case 2. When the fixing bolt 20 is inserted into the flange portions 19a and 19b having such a shape and tightened, as shown in FIG. 1, the angled flange portions 19b are bent and deformed in the vicinity of the bent portions, and the cooling jacket 1 7 is fixedly mounted in a state where a minute gap S is formed between it and the closed case 2.

Next, the operation of the above embodiment will be described.

When power is received by the power receiving terminal 6 provided on the upper portion of the sealed case 2, the rotating magnetic field of the stator 7 constituting the electric element 4 causes the rotor 8 rotatably provided therein to rotate. To do. When the rotor 8 rotates, the crank shaft 3 fixed to the rotor 8 rotates at the same time, and the eccentric roller 13 fitted in the eccentric portion 3a also rotates eccentrically in the cylinder chamber 12.

Further, the tip of the blade 14 elastically supported in the blade groove formed in the cylinder block 11 reciprocates along the blade groove while being in contact with the outer peripheral portion of the eccentric roller 13 which eccentrically rotates. The cylinder chamber 12 is divided into a low pressure side and a high pressure side.

Further, the helium gas is sucked into the cylinder chamber 12 through the suction pipe 15 and compressed by the volume change of the cylinder chamber 12 due to the eccentric rotation of the eccentric roller 13. Since this helium gas has a large specific heat ratio, it generates a large amount of heat due to compression, and it is necessary to cool the compression element 5, and the lubricating oil stored at the bottom of the sealed case 2 is passed through the lubricating oil pipe 16 to the sealed case. The compression element 5 is injection-cooled by inflowing due to a pressure difference between the internal pressure of 2 and the inside of the cylinder chamber 12 (internal pressure of case> internal pressure of cylinder). The lubricating oil pipe 16 is provided on the cooling jacket 17 so as to alternately meander with the cooling water pipe 18 for cooling the cooling oil pipe 16. By passing the cooling water through the cooling water pipe 18, the inside of the lubricating oil pipe 16 is closed. The passing lubricating oil is being cooled.

The cooling jacket 17 is fixedly mounted around the portion corresponding to the electric element 4 of the closed case 2 with a minute gap S formed between the cooling case 17 and the closed case 2. In this embodiment, the cooling jacket 17 is composed of a combination of divided jackets 17a and 17b each having a half-cylindrical shape, and flanges 19a, which have different shapes, are formed at both end edges of each divided jacket 17a, 17b. 19b is formed and the fixing bolts 20 are fastened to the oppositely facing flange portions 19a and 19b of the same shape, so that the vicinity of the bent portion between the angle-shaped flange portions 19b is formed as shown in FIG. The minute gap S is formed by bending and deforming. However, the present invention is not limited to this configuration. For example, by providing a plurality of protrusions on the inner peripheral surface of the cooling jacket in which a plurality of spacers are inserted, the inner peripheral surface of the cooling jacket 17 and the outer peripheral surface of the closed case 2 are provided. It suffices if the contact area with can be reduced to half or less. As shown in FIG. 6, the contact area between the inner peripheral surface of the cooling jacket 17 and the outer peripheral surface of the hermetically sealed case 2 is smaller than in the conventional case, so that the electric element portion by the cooling water pipe 18 of the cooling jacket 17 is reduced. The cooling of No. 4 will be suppressed. Therefore, the cooling effect of the lubricating oil in the lubricating oil pipe 16 by the cooling water pipe 18 can be improved, and the compression element 5 can be sufficiently cooled by the lubricating oil.

That is, by cooling the lubricating oil in the lubricating oil pipe 16, the helium gas can be cooled, the lubricating oil is not carbonized, and the carbide does not adhere to the discharging valve, so that the discharging valve is prevented from being damaged. be able to. Moreover, since the compression element 5 is cooled, the viscosity of the lubricating oil does not decrease, and the wear of the sliding portion can be reduced. Furthermore, since the specific volume of helium gas is small, the volumetric efficiency is high, and it is possible to provide a highly reliable rotary helium compressor with high reliability.

[0024]

[Effect of device]

 As described above, according to the rotary helium compressor of the present invention, it is possible to improve the cooling effect of the lubricating oil by the cooling water of the cooling jacket and to sufficiently cool the compression element. Be effective.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a state after fastening a fixing bolt when a cooling jacket is mounted on a rotary helium compressor of an embodiment of the rotary helium compressor according to the present invention.

FIG. 2 is a schematic plan view showing a state before fastening a fixing bolt when the cooling jacket of the rotary helium compressor according to the present embodiment is mounted.

FIG. 3 is a front vertical sectional view showing the internal structure of the rotary helium compressor of the present embodiment.

FIG. 4 is a front view showing the external appearance of the rotary helium compressor of this embodiment.

FIG. 5 is a plan view showing the outer appearance of the rotary helium compressor of this embodiment.

FIG. 6 is a graph for explaining the function and effect of the rotary helium compressor of this embodiment.

[Explanation of symbols]

 1 Rotary Helium Compressor 2 Closed Case 16 Lubricating Oil Pipe 17 Cooling Jacket 18 Cooling Water Pipe S Small Gap

Claims (1)

[Scope of utility model registration request] 1. A rotary helium compressor in which helium gas is used as a refrigerant and a cooling jacket for cooling a lubricating oil pipe with a cooling water pipe is mounted around a hermetically sealed case, wherein the hermetically sealed case is provided with a minute gap therebetween. A rotary helium compressor that is equipped with a cooling jacket.