JPS61126396A - Scroll compressor - Google Patents

Abstract

PURPOSE:To permit the effective pouring of oil or coolant into the both compression chambers and simplify the structure of a compressor by forming a thin hole for pouring oil onto the mirror plate part of a fixed scroll and allowing said thin hole to communicate to the both compression chambers formed between the fixed-side and turning-side scrolls. CONSTITUTION:A thin hole 22 for pouring oil is formed onto the mirror plate 5a at the nearly center position of the toothed bottom surface 5g of a fixed scroll lap. Said thin hole 22 is allowed to communicate to the compression chambers 8a and 8b formed with the fixed scroll lap 5b and a turning scroll lap 6b as shown in the figure. Therefore, oil or coolant can be effectively poured into the both compression chambers 8a and 8b. Further, since the inside diameter da of a throttle part can be set larger than that in the conventional, in order to carry-out oil (liquid) pouring work by using one oil (liquid) pouring pipe, the clogging phenomenon at the throttle part is eliminated, and the reliability of the compressor as a whole can be improved. Further, the piping around the compressor can be simplified, and the dimension of the compressor unit can be reduced.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] Does the present invention employ an oil injection mechanism or a refrigerant injection mechanism for cooling working gas? ! This relates to a scroll compressor for air conditioning.

[Background of the invention]

For example, as a scroll compressor equipped with a cooling mechanism for cooling the working gas and cooling the compressor body,
As shown in Japanese Patent No. 6-85087, high-pressure oil is supplied to the fixed scroll Os plate through an oil cooler.
A so-called oil injection method in which oil is injected through an oil injection hole is known. The scroll compressor has a pair of compressors, and therefore requires two oil injection holes and piping. For this reason, there are two places to adjust the oil supplied to the pair of compression chambers, and the method of distributing the oil evenly to both compression chambers is a specific problem, making this oil amount adjustment method difficult. There was a problem.

In other words, since there is one pair of oil piping, two throttling mechanisms are also required for equal and accurate flow rate adjustment.

In addition, the piping around the compressor becomes complicated, and because the oil injection hole is provided in the end plate part of the side wall of the scroll wrap, relatively high processing accuracy is required for positioning the hole. [Object of the Invention] In view of the above-mentioned problems, the object of the present invention is to provide an effective method for injecting oil or refrigerant into both compression chambers. Another object of the present invention is to provide a nine-scroll compressor that reduces the cost of the product by simplifying the structure of the compressor.

C@″oak).

In order to achieve the above object, the present invention provides oil or refrigerant injection holes in the end plate of a fixed scroll, and compresses the pores formed between the outside of the fixed scroll wrap and the inside of the orbiting scroll wrap. chamber and features configured to communicate with a compartment of the compression chamber formed by the interior of the fixed scroll wrap and the exterior of the orbiting scroll wrap.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, and shows a refrigerant injection mechanism knit for refrigeration and air conditioning, which has an oil injection mechanism.

A vertical electric compressor having a scroll compressor part 2 connected to the upper part and a motor part 8 connected to the lower part is housed in the closed container 1. The compressor section includes a fixed scroll 5 forming a compression element.
and orbiting scroll 6 (the wraps of both are shown reduced for modeling purposes).

), a rotation prevention member 6d of the orbiting scroll 6, a main shaft 7 having a crankshaft 7a that engages with the orbiting scroll 6, and a bearing portion supporting the main shaft 7, that is, a bearing of the orbiting scroll 6. 6C, a main bearing 4a formed in the frame 4, an auxiliary bearing 4b located below the main bearing 4a, and the like. This hermetic scroll compressor is of a high pressure chamber type in which the inside of the hermetic container 1 is in an atmosphere of a discharge pressure (high pressure side pressure) pa. Further, the shape of the scroll wrap is an involute or a curve similar to this.

Next, the operation of the scroll pressure a machine will be explained according to the flow of refrigerant gas (the flow of lubricating oil inside the compressor will be omitted). The low-level refrigerant gas is introduced from the suction pipe 11 as shown by the solid line arrow, reaches the suction port 14 in the fixed scroll 5 via the suction joint 17 and the check valve part 18, and then enters the compression element part. The resulting refrigerant gas is introduced into the closed space. Due to the revolution movement of the orbiting scroll 6, which is prevented from rotating, the closed space 8 formed by both scroll members gradually contracts and moves to the center of the scroll, and the refrigerant gas is increased in pressure and discharged from the central discharge hole 10. The discharged high-temperature, high-pressure refrigerant gas flows into the upper part 9 of the sealed container 1 II! L, then passages 161L, 16
1) fills the space 1b around the electric motor through the discharge pipe 1
8 to the outside at a high discharge pressure pa. Further, the oil injection pipe 21 is connected to an oil injection hole 22 provided in the end plate portion of the fixed scroll 6.

During steady operation of the compressor, oil supplied through the oil injection pipe 21 is injected into the compression chamber 8 through the pore 22 to cool the working gas within the compression chamber. As a result, oil injected from the oil injection pipe 21 is injected into the compression chamber 8 through the pore 221, mixed with the working gas, and discharged together with the working gas from the discharge hole 10 into the discharge chamber 1a. It then passes through passages 16a, 161) to reach the motor chamber 16, where the working gas and oil are separated. Separated nine oils are placed in a sealed container 1
It falls to the bottom and is stored. The working gas with a low oil content reaches an external oil separator 28 via a discharge pipe 18 . Here, the oil in the working gas is separated again, and the kernel oil is separated from the oil pipe 24,
25 to serve as injection oil. Note that 26 is an oil cooler, and 27 is an oil amount adjustment valve. An oil extraction pipe 28 is provided at the bottom of the container, and the kernel oil pipe 28 joins the oil pipe 24.26, and these oil pipes 28.2i,
21 etc. constitute an oil injection piping route. Note that solid line arrows indicate the flow direction of working gas (refrigerant gas), and broken line arrows indicate the flow direction of oil. The gas from which oil has been separated in the oil separator 28 is sent to the condenser 80 through a pipe 29.

under Next, the oil injection hole 22 will be explained in detail.

FIG. 2 is a bottom view of the fixed scroll 6 showing the position lf of the pores. In the figure, the end portions of fixed scroll wraps 5e and 5@'u are shown. An oil injection hole 22 is provided in the end plate 5a at approximately the center of the tooth bottom surface 5g of the fixed scroll wrap.

There is.

8 to 6 show operating conditions when oil is injected into the compression mechanism exiting the fixed scroll of the embodiment of FIG. 1.

In this embodiment, oil is intermittently injected into the two adjacent compression chambers 8a and 8b through the 1@ oil injection pore 22. As mentioned above, each compression chamber ga, 3b and oil injection 1゜2yo2>1lsJ
IJ, Nika□□I, 3Eyo 9.5. 1 piece limit (
It can be equipped with a so-called constriction function that adjusts the amount of lubrication. In this case, the pore diameter da of the group pores 22
For the lap thickness of the orbiting scroll, the following formula should be practically satisfied: 0 6a ≦ t ...Axis ...
(1) The oil injection pore 22 shown in FIG. 2 is set as follows. In other words, let's virtually inject oil now.

The wrap position jj- is the position of point C and point D, and the distance connecting the 0 point and point D, that is, on the circumference with the diameter between C and D, and around the bottom surface of the end plate 5& of the fixed scroll 5. It is installed in the center position.

In FIG. 2, C-D and its radius Ro are given by the quadratic formula. That is, the average internal pressure at point C and the scroll wrap winding angle (in o' + t) at point is the average internal pressure at the position of the pore 22 provided on the circumference with CD as the diameter. Become even.

Ro = CD/2.0 ・------
-----・<8) Here, a Basic circle radius of the curve of the varnished roll wrap (mm) λoie: Virtually oil-filled, combed! Scroll wrap winding angle (rai) at point C where you are trying to roll 7t - 2 pi t Roll wrap thickness mm) In the case of Fig. 2,
The oil injection hole 22 is also a position where intermittent VC communication is made with the compression working chamber during the suction stroke of both scrolls. This provides a function to prevent hydraulic pressure a during startup. In FIG. 2, the radius R.

The circle P formed by is shown by a dotted line. Note that the diameter aS of the oil injection pore 22 is desirably smaller than the scroll wrap thickness, as shown in equation (1). Also, the second
In the figure, the oil hole 22 is located in the compression working chamber (
For example, by temporarily communicating with the 6g/5g suction chamber 5f shown in Figure 8 (9 spaces), a cooling effect is created for the working gas during the suction stroke, which improves volumetric efficiency. There is also this effect.

FIGS. 4 and 5 show that as the orbiting scroll 6 rotates, the oil injection pores 22 are intermittently communicated with the compression chambers 8a and 8b. FIG. 4 is an explanatory diagram in which an oil injection action can be performed (must be communicated once per one rotation of the main shaft). 21 is an oil injection pipe.

FIG. 6 shows the oil injection hole 22 provided at a position closer to the center (position where the pressure is higher) than the oil injection hole 22 shown in FIG. This is an example of the pore 221). The pores 22'b are complementary to the hypothetically provided oil injection positions V and W points, that is, the average pressure at points 7 and W is equal to the position on the circumference whose diameter is T. The average pressure is approximately equal to the average pressure at the position of the pores 221). Note that the pores 221) do not communicate with the compression chamber formed by both scrolls during the suction stroke, but communicate with the compression chamber 80 and the like that always form a closed space. The reason why the oil injection holes 22 and 22b are provided at approximately the center of the tooth bottom surface of the fixed scroll wrap is to efficiently distribute the amount of oil to both the compression chambers 8a and 8b. It's for a reason. Even if the oil injection holes 22, 221) are provided on the tooth groove center line q in this way, there is no practical problem in terms of cooling the working gas and the compressor body. A pore for oil injection is provided in the end plate 5&! In addition, the pores 22G are provided in the compression chambers on both sides of the compression chamber 8& formed by the outside of the wrap of the fixed scroll 6 and the inside of the wrap of the orbiting scroll 6, and the compression chamber 8b located in a symmetrical position with respect to the compression chamber 8&. In order to provide the oil injecting hole 220 at a position where it communicates intermittently with ga and 3b, the oil injection hole 220 is located at a position that is closer to the outside than the lap thickness t from the tooth side surface 5m of the wrap portion of the fixed scroll. This is an embodiment in which holes are provided in the end plate of the fixed scroll. In this embodiment, the amount of oil supplied to both compression chambers 8&, 8b can be equally distributed.

That is, the embodiments shown in FIGS. 2 to 7 are examples of a structure in which l oil is intermittently injected into the two compression chambers ga and 8b through a 1-diameter injection pore.

FIGS. 8 to 18 show examples in which the diameter of the oil injection pores is relatively large.

Figures 8 and 9 show the oil injection hole 81 in the fixed scroll 5.
The tooth bottom surface 6g of the end plate portion 5& is provided at the y center position (the center portion of the tooth groove is indicated by a one-dot broken line q. The four curves are also the same curve as the scroll wrap curve). The extraction hole 31 consists of a constricted part 811) and an opening part 81a. The aperture of the aperture part 811) is indicated by aO. The cross-sectional shape of the opening 81 is circular, and the diameter of the hole 81a is indicated by ag. These two diameters have a relationship of eL O (tl g) so that both compression chambers are continuously supplied with oil (one injector).

As shown in FIG. 8, the pores 31
The compression chamber 8a formed by the outside of the wrap of the orbiting scroll 6 and the inside of the wrap of the orbiting scroll 6, and the compression chamber 8b formed by the inside of the wrap of the fixed scroll and the outside of the wrap of the orbiting scroll 6, are provided at a position such that they communicate at the same time. ing. Therefore, in order to obtain a positional relationship in which the oil injection hole 31 (or a relatively large oil injection hole) constantly communicates with both the compression chambers 8a and 8b, the following equation should be practically satisfied. (
(L g (2ε-t ・・・・・・・・・・・・(4
) Here, t: Wrap thickness of the orbiting scroll (mm)
: Radius of orbit of orbiting scroll (mm) ds: Diameter of oil fill hole Note that 21 is an oil injector pipe, and for the sake of explanation, the direction in which the oil flows is shown by a broken line arrow.

FIG. 10 and FIG. 11 show another embodiment, in which an oil injection hole 41 provided in the end plate portion 5a of the fixed scroll is used to supply oil to the compression chambers 8a and 8'b on both sides formed by both scrolls. In order to equalize the distribution of the amount, this embodiment is set to a position closer to 5 ml of the outer side wall surface of the fixed scroll wrap and eccentric to the center of the tooth space. In the case of a souffler compressor, the pressure increases toward the center of the scroll, so the internal pressure of the compression chamber 8b is higher than the internal pressure of the compression chamber 8b. In terms of pressure, there is a deviation of 180 degrees (π radian) when expressed in terms of the rotation angle of the main axis. Therefore, in order to perform differential pressure oil supply with the high-pressure part, which is the amount of oil supplied, in order to equalize the pressure distribution of the amount of oil supplied, the communication period between the oil-based oil hole 41 and the compression chamber 8a should be set to A position closer to the center of the crawl than the communication period with chamber 8b,
In other words, it is set at a position eccentric to the center of the tooth groove. The dimension of its may be set in consideration of the above formula (1).Practically speaking, the dimension of *llI is approximately expressed by the following formula.

dgzaki (1,0~z,o)-L・・・・・・・・・・・・
・(5) Here, the amount of eccentricity (mm) from the center of the tooth groove to ls
ε: Turning radius (mm) 1! L The base circle radius of the varnish scroll curve (mm l, that is, in the embodiments shown in FIGS. 8 to 11, as shown in the explanations so far, the stage injection mechanism ( Alternatively, one hole (or pore) for the liquid injection mechanism (described later) is provided, and the center position of the scroll wrap is located at the center of the scroll wrap (in the radial direction), rather than the center position q of the lap tooth space. ), or at least the opening of the oil injection hole (the part that communicates with the compression chambers 5a, 5b, etc.) is provided at the center of the lap tooth space.

FIG. 12 and FIG. 18 show still another embodiment, in which the opening surface of the oil injection hole 51 has a long hole shape extending in the radial direction. In this embodiment, the constricted portion 51b of the oil injection hole 51 connected to the oil injection pipe 21 has a circular shape with a relatively small hole diameter, and has an opening 51L that engages with the compression chambers 8a and 8b.
has a long hole shape. The position of the elongated hole 51a is determined by moving the center p of the elongated hole 61 toward the center of the scroll by a distance of in with respect to the tooth space center line q, in order to evenly distribute the amount of oil supplied to both compression chambers 8a and gb. Figure 14 shows the fixed position using the elongated oil injection hole.
y is 1″9 Compression mechanism section 0 Oil is injected 01 indicates the operating status.

The dimension H6 of the elongated hole 51 shown in FIG. 8 is practically a value expressed by the following equation.

t<ms<2@-f: Music...==(6) In FIG. 14, 5c is a working gas intake port, and suction hole 5f is a suction chamber. The working gas flows up into the closed spaces 8 (81L, 81
)+80) from the outside to the center to reduce the volume and create a central discharge hole 10 provided in the end plate of the fixed scroll.
The working gas is from.

It is injected and guided to the outside.

Although each of the above embodiments has shown the optimum position structure for the oil injection hole provided in the end plate of the fixed scroll, the present invention can also be applied to a refrigeration system using a liquid injection mechanism and a refrigeration system using a gas injection groove. Examples thereof will be described below.

FIG. 15 shows an embodiment of a refrigeration system using a liquid injection mechanism. Solid arrows indicate the flow direction of the refrigerant gas, and dashed arrows indicate the flow direction of the cooling refrigerant liquid. The pipes 61 and 62 are liquid injection pipes, and the pores 68 provided in the end plate portion 5a of the fixed scroll 6 are the liquid refrigerant injection holes of the present invention. 64 is a condenser, 65 is an evaporator, 66 is a main l# expansion valve, and 67 is a sub expansion valve. A liquid refrigerant is introduced through the liquid injection pipe 61K, and the liquid refrigerant for cooling is constantly or intermittently injected into the compression chamber 8a and both compression chambers at 8° C. through the liquid injection hole 68. Ru. The injected upper liquid refrigerant removes the heat of compression (cools the refrigerant gas) during the compression process, and as a result, the motor 8
This is used to cool the entire compressor. 6B is a reverse valve for preventing backflow of liquid refrigerant and refrigerant gas from the compression chamber to the sub-expansion valve 67be. The structure of each part of the scroll compressor is the same as in each of the above-described embodiments, so a description thereof will be omitted.

FIG. 16 shows a bottom view of the fixed scroll of FIG. 16,
This is an embodiment in which liquid refrigerant injection holes 68 are provided in the end plate portion 5& of the fixed scroll 5. The liquid refrigerant injection hole 68 is located relatively close to the discharge hole 10 provided in the center of the fixed scroll. Liquid refrigerant is intermittently injected into the compression chamber 8's8'' through the extraction hole 68.As explained above, in order to cool the compressor by the liquid injection action, the liquid refrigerant injection hole 6
8 is preferably provided in the final region of the compression stroke (see FIG. 16). On the other hand, in the case of the oil injection method described above, it is desirable from the viewpoint of performance and cooling to provide the oil injection hole at an earlier position in the compression stroke (see FIGS. 8 and 14).

Note that the present invention can also be applied to the scroll compressor disclosed in Japanese Patent Application No. 54-95082. The structure of the scroll compressor of the above application forms a so-called pressure-asymmetric scroll curve in which the fixed scroll wrap is extended at a wrap winding angle of 180 degrees from the orbiting scroll wrap.In this case, adjacent compression chambers are connected to the main axis. The pressure relationship is always deviated by 180 degrees per rotation angle. When the present invention is adopted in this structure, a cooling oil injection hole (JB or liquid injection hole) 11 may be provided at the center position of the scroll wrap tooth space.

〔Effect of the invention〕

As explained above, according to the present invention, one hole for oil injection or one hole for injection of refrigerant liquid (gas) may be provided in the end plate portion of the fixed scroll. In addition, in the present invention, since the oil (liquid) injection action is performed with one oil (liquid) injection pipe, the inner diameter da of the constricted portion can be made 2 to 8 times wider than that of the conventional technology.
This eliminates the phenomenon of clogging of the throttle section, and has the effect of improving the reliability of the compressor as a whole. In addition, the piping for oil (liquid) injection is unified into one, the piping around the compressor is simplified, and the compressor unit has the effect of being made smaller. Furthermore, since the oil injection hole is provided in the center of the tooth space of the fixed scroll, there is also an effect that the machining accuracy in positioning the hole is relaxed.

[Brief Description of the Drawings] Fig. 1 is a new side view of a compressor unit of a refrigerating and air conditioning refrigeration system equipped with an oil injection mechanism showing one embodiment of the present invention, and Fig. 2 is a fixed scroll of Fig. 1≠. bottom view, No. 8
The figure is a plan view showing a state in which the fixed scroll shown in FIG. 2 is engaged with the orbiting scroll, FIG. 4 is a longitudinal sectional view of the oil injection mechanism, and FIG. 5 is a longitudinal sectional view showing its operation. Fig. 6 shows another embodiment, in which the bottom view of the fixed scroll J- with different positions of the oil injection hole, and Fig. 7 "fixed screw shown in Fig.
A/ turns 8! FIG. 8 is a longitudinal sectional view of the oil injection mechanism showing another embodiment, FIG. 9 is a plan view of the oil injection hole, and FIG. A vertical sectional view of an oil injection mechanism section showing an embodiment, 1st
Figure 1 shows a plan view of the oil injection hole. Fig. 12 is a longitudinal cross-sectional view of an oil injection mechanism showing still another embodiment, Fig. 18 is a plan view of the oil injection hole portion, and Fig. 14 shows the fixed scroll shown in the first part 8 meshing with the orbiting scroll. A plan view showing a state in which the FIG. 15 is a configuration diagram of a refrigeration system equipped with a liquid injection mechanism showing still another embodiment, and FIG. 16 is a plan view showing the position of the liquid injection hole in a state where both scrolls are engaged. 5...Fixed scroll 5&...End plate 5b...
Wrap 6...Orbiting scroll 6a...End plate 6b
... Wrap 7 ... Rotating shaft 7a ... Eccentric shaft 10
...Discharge port 8as 8 bs 8'...Compression chamber 22,221), 220...Oil injection hole 31.41
, 51... Oil injection hole 68... Liquid injection hole. 3rd (2) 5C $em

Claims (7)

[Claims] 1. A fixed scroll member and an orbiting scroll member having a spiral wrap standing upright on a disc-shaped end plate are engaged with each other with the wraps inside each other, and the orbiting scroll member is engaged with an eccentric mechanism connected to a rotating shaft, thereby forming an orbiting scroll member. The fixed scroll member is provided with a discharge port that opens at the center and an intake port that opens at the outer periphery, and gas is inhaled from the intake port, and the gas is injected into both scroll members. This is a device that compresses gas by reducing its volume by moving it around a closed space formed by a cylinder, and then discharges the compressed gas from a discharge port. In a scroll compressor equipped with a scroll compressor, one injection pore is provided in the end plate portion of the fixed scroll, and the pore is defined as a compression chamber formed by the outside of the fixed scroll wrap and the inside of the orbiting scroll wrap;
1. A scroll compressor, characterized in that the scroll compressor is formed to communicate with a compression chamber formed by an inside of a fixed scroll wrap, an inside of an orbiting scroll wrap, and an outside of the orbiting scroll wrap. 2. The scroll compressor according to claim 1, wherein the injection hole is provided so as to communicate with both the compression chambers at the same time. 3. The scroll compressor according to claim 1, wherein the injection hole is provided so as to communicate intermittently with both the compression chambers. 4. 9. The scroll compressor according to claim 2, wherein the injection hole is provided at an eccentric position closer to the outer wall surface of the fixed scroll wrap than the center of the bottom surface of the tooth. 5. 9. The scroll compressor according to claim 2, wherein the injection hole is provided at approximately the center of the bottom surface of the fixed scroll wrap. 6. The scroll compressor according to claim 2 or 3, wherein the injection pores are provided outside the tooth side of the fixed scroll wrap by a thickness of the orbiting scroll wrap. 7. The scroll compressor according to claim 2 or 3, wherein the injection pores are formed in the shape of long holes extending in the radial direction.