JPS62265487A - Scroll compressor - Google Patents

Abstract

PURPOSE:To reduce the number of parts, by a method wherein the interior of a shell is divided into a high pressure space, to which burst gas incomes, and a low pressure space, where intake gas and a compression mechanism part are contained, by means of a partition plate. CONSTITUTION:A partition plate 31 is located between the upper end of an lower shell 29 and the lower end of an upper shell 30. A high pressure space 34 and a lower pressure space 35 are formed separately from each other by means of the partition plate 31. The high pressure space 34 is worked in the same manner in that the delivery muffler of a conventional compressor is worked, an abnormal high pressure during compression of liquid is damped. Further, since a heat insulating material 33 is located in the partition plate 31, a compressor is prevented from lowering of performance. This constitution enables reduction of the number of parts on the whole by means of the partition, and permits reduction of a cost.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a scroll compressor used as an air compressor, a refrigerant compressor, or the like.

[Conventional technology]

Figures 6(a) to (dl) show the basic components of a scroll compressor. In Figure 6, 1 is a fixed scroll;
2 is an oscillating scroll, 3 is a discharge port, 4 is a compression chamber, 0 is a fixed point of the fixed scroll, and 0' is a fixed point of the oscillating scroll. The fixed scroll 1 and the orbiting scroll 2 are composed of spirals having the same shape, and the shape thereof is formed by an involute curve or the like, as is conventionally known. Next, the operation will be explained. In FIG. 6 (a1 to (d)), the fixed scroll 1 is stationary with respect to space,
The oscillating scroll 2 is combined with the fixed scroll 1 as shown in the figure, and performs rotational movement, that is, oscillation, without changing its attitude with respect to space, and performs a rotational movement, that is, an oscillation, as shown in FIGS. It moves at 90°, 180°, and 270°.As the swinging scroll 2 swings, the crescent-shaped compression chamber 4 formed between the fixed scroll l and the swinging scroll 2 gradually reduces its volume. The gas taken into this compression chamber 4 is compressed and discharged from the discharge port 3. During this time, the distance from 0 to 0' shown in FIG. If the gap is expressed by p1 and the thickness is expressed by t, then o o' = −-t.p
corresponds to the pitch of the spiral. A conventional example in which a compressor that performs a compression action based on such an operating principle is applied to a refrigerant compressor will be described. For example, Figure 7 shows the patent application filed in 1986-10, which the applicant previously proposed.
6305 is a vertical cross-sectional view showing a mechanism similar to the scroll compressor shown in No. 6305. In Figure 7, 1 is a fixed scroll;
2 is an oscillating scroll, 3 is a discharge port, 4 is a compression chamber, 5 is a crankshaft, 6 and 7 are bearing frames, 8 is a motor/rotor, 9 is a motor/stator, 10 is a shell, 11 is an Oldham joint, 12 13 is an oil reservoir provided at the bottom of the shell, 13 is a suction pipe for refrigerant gas, 14 is an oscillating bearing that fits into the oscillating scroll shaft 2a provided eccentrically on the crankshaft 5, and 15 fits into the upper part of the crankshaft 5. 16 is the crankshaft 5
The motor side bearing that fits into the lower part, 17 and 18 are communication holes for the suction gas path, and 19 are the suction holes for the suction gas path. In addition, 2o is the discharge pipe of the discharge route, 22 is the shell 1
0 is a discharge muffler installed perpendicularly to the discharge muffler, 23 is a discharge muffler artificial pipe connecting the discharge pipe 20 and the inlet 22a at the upper part of the discharge muffler, 21 is a discharge pipe which constitutes a discharge route together with the discharge pipe 20, It is connected to the outlet 22b. 24 connects the vertical discharge muffler 22 to the shell 10
A fixture 25 for fixing to the fixed scroll 1 is a check valve, which is fixed to the upper surface of the discharge port 3 provided in the fixed scroll 1 together with a hand presser 27 by bolts 28 or the like. Reference numeral 26 designates a discharge chamber cover that isolates the check valve 25 from the low-pressure part inside the shell 1° and houses the check valve 25 in the high-pressure part, and is fixed to the upper part of the fixed scroll 1 with bolts (not shown) or the like. There is. Further, the upper part of the inside of the discharge chamber cover 26 is connected to the discharge pipe 2°. The fixed scroll 1 is mounted on a bearing frame 6.
7 and fixed with screws, etc., and the oscillating scroll 2 is fixed to the crankshaft 5 while being engaged with the fixed scroll 1.
The shaft 2a is fitted into the shaft 2a. The crankshaft 5 is supported by a bearing frame 6.7 which is connected to each other by a spigot or the like. In addition, the motor/rotor 8
is fixed to the crankshaft 5, and the motor/stator 9 is fixed to the bearing frame 7 by press fitting, shrink fitting, screwing, or the like. Furthermore, the Oldham joint 11 is connected to the oscillating scroll 2
and the bearing frame 6, and the oscillating scroll 2
It is designed to prevent rotation of the The compression mechanism section assembled in this manner is housed and fixed within the shell/L/10. Next, the operation of the scroll compressor configured as above will be explained. When the motor rotor 8 rotates, the oscillating scroll 2 begins to revolve through the crankshaft 5, and compression starts according to the operating principle explained in FIG. After being sucked into the shell 10 of the compressor and cooling the motor through the communication hole 17 and the motor air gap, it is taken into the compression chamber 4 through the communication hole 18 and through the suction hole 19 provided in the fixed scroll 1. The compressed gas enters the discharge muffler 22 through the discharge port 3 and the check valve 25, the discharge pipe 20, and the discharge muffler artificial pipe 23, and then passes through the discharge pipe 21 and is discharged to the outside of the compressor. Conventionally, when a compressor is installed in an air conditioner, etc., when the compressor is restarted after being stopped for a long period of time, when the compressor is restarted with refrigerant stagnation, there is a situation where liquid refrigerant is stagnation even in the discharge pipe. When the compressor is started, the pressure inside the shell 10 drops rapidly, causing the liquid refrigerant to boil and foam.The foam enters the compression chamber 4 and is compressed, creating an abnormally high pressure. Because the liquid refrigerant is stagnant, the abnormally high pressure generated by liquid compression cannot be transmitted to other parts, and the stress caused by the abnormally high pressure acts on the discharge piping, causing a breakage accident of the piping in the discharge route. In addition, discharge pulsation during compressor operation was a cause of accidents similar to the above.Furthermore, the discharge port 3 provided in the fixed scroll 1
In a scroll compressor where the discharge piping 20 is in direct communication with the compressor, immediately after the compressor stops, the pressure difference between the high-pressure discharge piping side and the low-pressure space inside the compressor shell causes the discharge to drop. The oscillating scroll moves in reverse until the pressure in the pipe and the pressure in the shell are equalized, which has led to complaints about operating noise in the market. In order to solve these problems, a scroll compressor having the structure shown in FIG. 7 and described above has been proposed. In the scroll compressor configured in this way, by providing the discharge muffler 22 outside the shell 10, the abnormally high pressure caused by liquid compression as described above is attenuated, and the piping of the discharge path due to stress caused by the abnormally high pressure is reduced. It was possible to prevent such breakage accidents, and at the same time, it was also possible to reduce discharge pulsation in the discharge pipe 21 during compressor operation. Furthermore, by providing the check valve 25 above the discharge port 3 provided in the fixed scroll 1, it is possible to shut off the high pressure discharge path and the low pressure inside the shell 10 immediately after the compressor is stopped. Therefore, the reverse movement of the oscillating scroll 2 due to the pressure difference between the high pressure section and the low pressure section can be prevented, and the market complaints caused by the above-mentioned reverse movement of the oscillating scroll can be resolved.

[Problems to be Solved by the Invention] However, in a scroll compressor as shown in FIG. 7, a discharge muffler located outside the shell is attached to the discharge path, and a discharge chamber cover is provided above the fixed scroll. Since the check valve is housed inside the cover, the number of parts increases, which increases costs and makes assembly difficult.Also, since the discharge muffler is attached to the outside of the shell,
There was a problem in that the external dimensions were large and a large space was required when incorporating it into air conditioning equipment. This invention was made to solve the above-mentioned problems, such as abnormally high pressure due to liquid compression when the compressor is started, discharge pulsation during operation, and reverse movement of the oscillating scroll when the compressor is stopped. It is an object of the present invention to provide a scroll compressor that can handle various problems, has small external dimensions, has a simple structure, and can provide high reliability at low cost. [Means for Solving the Problems] The scroll compressor according to the present invention is provided with a partition plate on the upper end surface of the fixed scroll that communicates only with the discharge port and seals the entire inner peripheral surface of the shell. inside the shell,
It is divided into a high-pressure space into which the discharge gas discharged from the fixed scroll flows, and a low-pressure space in which the suction gas introduced from the suction pipe exists and the compression mechanism is accommodated.

[For use]

In the scroll compressor according to the present invention, a partition plate is provided above the fixed scroll to separate a high-pressure space into which discharge gas flows from the fixed scroll into a high-pressure space into which discharge gas flows in from the fixed scroll, and a low-pressure space into which suction gas is introduced from the suction pipe. Since the discharge muffler is partitioned with It is possible to prevent abnormal high pressure caused by the compressor, discharge pulsation that occurs when the compressor is in operation, and reverse movement of the oscillating scroll that occurs when the compressor is stopped. In addition, with this invention, the discharge muffler that was conventionally installed outside the shell can be eliminated, so the external dimensions can be reduced, and the discharge muffler artificial piping, discharge chamber cover, etc. can also be eliminated, and the check valve can be mounted on bolts, etc. together with the partition plate. Coupled with the fact that it can be fixed to the fixed scroll with a fixture, the number of parts is small, and assembly is easy by fixing the partition plate to the shell by welding, etc., and reliability can be increased.

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, FIGS. 2(a) and (b) are perspective views of a fixed scroll and a partition plate, and FIG. 3 is an exploded perspective view of main parts. be. In FIG. 1, the same reference numerals as in FIG. 7 indicate the same or equivalent parts, 29 is a lower shell, 30 is an upper shell, 31 is a disc-shaped partition plate made of sheet metal, etc. fb), a plurality of bolt holes 31a and discharge holes 31b are provided in the center of the partition plate 31. When assembling the compressor, the partition plate 31 is inserted between the upper end of the lower shell 29 and the lower end of the upper shell 30 so that its outer periphery is in close contact, and extends all around the joint between the lower and upper shells 29 and 30. It is fixed by welding or the like to form the shell 10, and is tightly sealed to the inner peripheral surface of the shell 10. Also, fixed scroll 1
As shown in Fig. 2 (al), the discharge port 3 on the upper end surface 1a
An annular sealing surface 1b is protruded around the periphery, a bolt hole IC for fixing the partition plate 31 is provided on the sealing surface 1b, and a bolt hole 1d for fixing the fixed scroll 1 to the compression mechanism section is provided on the upper end surface 1a.
are provided respectively, and the check valves 25 and 25 are connected by bolts 28.
The partition plate 31 and the valve holder 27 are fastened and fixed together on the sealing surface 1b via a sealing material 32. 33 is a heat insulating material, and the heat insulating material 33 is inserted between the upper end surface of the fixed scroll 1 on the outer peripheral side of the sealing surface 1b and the partition plate 31. When assembling, as shown in Fig. 3, the fixed scroll 1
The discharge port 3 and the discharge hole 31b of the partition plate 31 match,
A check valve 25, a partition plate 31, a sealing material 32, and a heat insulating material 33 are attached to the compression mechanism section. 34 is the upper shell 30
35 is a high pressure space formed by the lower shell 29 and the partition plate 31, and 35 is a low pressure space formed by the lower shell 29 and the partition plate 31.
The interior of the shell 10 is divided into these spaces 34° and 35 by a partition plate 31. The configuration of this embodiment other than the above is the same as the conventional one shown in FIG.
In this embodiment, a muffler and muffler piping are not provided outside the shell 10. In the scroll compressor configured as described above, suction gas such as refrigerant gas, which is a working fluid, is introduced from the suction pipe 13 into the low pressure space 35, and from this space 35 the compressor is similar to the conventional compressor shown in FIG. Scroll fixed by the route 1
The air is taken into the compression chamber 4 through the suction port 19 provided in the air and is compressed. The compressed gas is discharged from the discharge port 3 and guided to the high pressure space 34 through the discharge hole 31b provided in the center of the partition plate 31 and the check valve 25, and then to the discharge pipe 20.
is discharged from the shell 10. In the gas discharge path as described above, the high pressure space 34 operates in the same way as the discharge muffler 22 in the conventional scroll compressor shown in FIG. Moreover, the discharge pulsation at the outlet of the discharge pipe 20 can be reduced.At this time, since the compressed discharge gas is at high temperature and high pressure, the temperature of the partition plate 31 also rises to the same temperature as the discharge gas.Generally As the temperature of the suction gas increases, the specific weight (weight per unit volume) of the refrigerant gas itself decreases, and in a refrigerant compressor with a fixed amount of displacement, the refrigerant circulation volume decreases and performance deteriorates. However, in the scroll compressor of this embodiment, there is a heat insulating material 33 between the upper end surface 1a of the fixed scroll 1 and the partition plate 31.
is inserted to block the heat. For this reason, the partition plate 3
Since the entire fixed scroll 1 is not heated at a temperature of 1, the above-mentioned deterioration in compressor performance is less likely to occur. In addition, in the gas discharge path, the check valve 25 is provided on the top surface of the partition plate 31 immediately after the discharge port 3 of the fixed scroll 1, so the high pressure space 34 and the low pressure space 35 are shut off immediately after the compressor is stopped. can. therefore,
Reverse movement of the oscillating scroll 2 due to the pressure difference between the high pressure section and the low pressure section can be prevented, and the same effect as the check valve 25 shown in FIG. 7 can be obtained. In addition, in the above embodiment, the upper end surface 1a of the fixed scroll 1
In order to provide a gap in the axial direction between the partition plate 31 and the partition plate 31, the sealing surface 1b was made to protrude from the upper end surface 1a of the fixed scroll 1 as shown in FIG. 2(a). b)
As shown in FIG. 5, a seal portion 31C is provided in the center of the partition plate 31 in a concave shape by press molding or the like, and is attached to the flat upper end surface 1a of the fixed scroll 1 as shown in FIG.
A gap 36 is obtained which has an effect similar to that shown in FIG.

【Effect of the invention】

As explained above, according to the present invention, the interior of the shell is divided by the partition plate into a high-pressure space into which the protruding gas flows and a low-pressure space that accommodates the intake gas and the pressure wJ mechanism, as shown in FIG. While having the same advantages as the conventional one,
The number of parts can be reduced, costs can be reduced, and the external dimensions can be reduced to require less installation space.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing a scroll compression chamber according to an embodiment of the present invention, FIG. , FIG. 4 (al and (bl) are a plan view and a sectional view showing a partition plate of a scroll compressor according to another embodiment of the present invention, FIG. 5 is a sectional view of the same main part, and FIG. 6 is a scroll compressor. Fig. 7 is a vertical sectional view showing an example of a conventional scroll compressor.1...Fixed scroll, la...Upper end surface, 1b...
- Shell surface, 2... Oscillating scroll, 5... Crankshaft, 6.7... Bearing frame, 8... Motor rotor, 9... Motor stator, 10... Shell,
13...Suction pipe, 14,15.16...Bearing, 20
...Discharge pipe, 25...Check valve, 27...Valve holder,
28...Bolt, 29...Lower shell, 30...
- Upper shell, 31... Partition plate, 31b... Discharge hole, 32... Sealing material, 33... Heat insulating material, 34.
35...Space, 36...Gap. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (and 2 others) Figure 2 (fi) Figure 33, Section 4 (a-) (jp) Figure 6 θ'9θ. Figure 7 Written amendment (voluntary) 1. Indication of the case Japanese Patent Application No. 107201/1982 2. Title of the invention Scroll compressor 3. Representative of the person making the amendment Moriya Shiki 5. Subject of the amendment (1) Specification Column 6 of the scope of claims, Contents of amendment (1) The scope of claims is amended as shown in the attached sheet. 7. Attached documents (1) Document stating the entire text of the amended scope of claims
Document 2 stating the full text of the claims after one amendment, Claim (1) A compression chamber is created between the two spirals by providing spirals such as involutes protruding from the plywood and combining the spirals with each other. A fixed scroll and an oscillating scroll are formed, and an oscillating scroll shaft provided on the opposite side of the volute of the oscillating scroll is rotatably supported via an oscillating bearing provided eccentrically by a predetermined amount to drive the oscillating scroll. a crankshaft that rotatably supports the crankshaft via a main bearing; a motor connected to the crankshaft to drive the crankshaft; a shell housing a compression mechanism consisting of each of the above parts; and a shell for penetrating the shell and introducing suction gas into the compression chamber. A suction pipe and a discharge path for discharging discharged gas from the fixed scroll to the outside of the shell are provided, and the discharge path includes a check valve that cuts off communication with the fixed scroll immediately after the compressor is stopped, and a blood discharge pipe. In the scroll compressor, a partition plate is provided on the upper end surface of the fixed scroll that communicates only with the discharge port and seals the entire inner peripheral surface of the shell, and the partition plate divides the inside of the shell into two spaces. , one of these spaces is a high-pressure space into which the discharge gas discharged from the fixed scroll flows, and the other is a low-pressure space in which the suction gas introduced from the suction pipe exists and the compression mechanism section is accommodated. Scroll compressor. (2) A patent claim in which the check valve provided in the discharge path of the discharged gas is disposed on the opposite side of the partition plate from the fixed scroll, and is fastened together with the partition plate on the fixed scroll using a fixing device such as a bolt. Scroll compressor included in the first range. (3) The partition plate has a gap in the axial direction between it and the upper end surface of the fixed scroll in addition to the portion facing the sealing surface around the discharge port of the fixed scroll and the discharge hole communicating with the discharge port. Scroll pressure as stated in range 1 or 2! I machine. (4) The scroll compressor according to claim 3, wherein the partition plate is disposed on the fixed scroll via a heat insulating material provided in a gap with the upper end surface of the fixed scroll.

Claims (4)

[Claims] (1) A fixed scroll and an oscillating scroll each having an involute or other volute protruding from the base plate and forming a compression chamber between the two volutes by combining the above-mentioned volutes with each other, and a side opposite to the volute of the oscillating scroll. A crankshaft that rotatably supports the provided oscillating scroll shaft via a oscillating bearing provided eccentrically by a predetermined amount and drives the oscillating scroll, and a bearing that rotatably supports this crankshaft via a main bearing. a support, an anti-rotation mechanism that prevents the oscillating scroll from rotating around the oscillating scroll shaft and causes the oscillating scroll to oscillate around the main bearing, and a motor that is connected to the crankshaft and drives the crankshaft. , a shell accommodating a compression mechanism consisting of the above parts, a suction pipe passing through the shell and introducing suction gas into the compression chamber, and a discharge path discharging the discharge gas from the fixed scroll to the outside of the shell. In a scroll compressor in which a check valve is provided in the discharge path to cut off communication with the fixed scroll immediately after the compressor stops, the upper end surface of the fixed scroll communicates only with the discharge port and the inner circumferential surface of the shell. A partition plate is installed to seal the entire circumference, and this partition plate divides the inside of the shell into two spaces.One of these spaces is a high-pressure space into which the discharged gas discharged from the fixed scroll flows, and the other is introduced from the suction pipe. A scroll compressor, characterized in that the scroll compressor has a low pressure space in which suction gas exists and the compression mechanism section is housed. (2) A patent claim in which the check valve provided in the discharge path of the discharged gas is disposed on the opposite side of the partition plate from the fixed scroll, and is fastened together with the partition plate on the fixed scroll using a fixing device such as a bolt. Scroll compressor according to item 1. (3) The partition plate has a gap in the axial direction between the partition plate and the upper end surface of the fixed scroll other than the portion facing the sealing surface around the discharge port of the fixed scroll and the discharge hole communicating with the discharge port. Scroll compressor according to scope 1 or 2. (4) The scroll compressor according to claim 3, wherein the partition plate is disposed on the fixed scroll via a heat insulating material provided in a gap with the upper end surface of the fixed scroll.