JPH0436092A - High pressure dome type rotary compressor - Google Patents

Abstract

PURPOSE:To surely prevent accident of seizure to the contact parts of a roller and a blade by providing an oil injection passage communicated to an oil sump, in a head, and by connecting an oil filling passage to the oil injection passage. CONSTITUTION:An oil injection passage 4 communicated with an oil sump 1a is provided in a front head 32. Further, an oil filling passage 5 is communicated with an oil injection passage 4. In this arrangement, the oil filling passage 5 is opened to an area in which the pressure is lower than that of an oil sump 1a, within a compression chamber X after completion of a suction stroke of a cylinder chamber 31a so as to feed oil to the contact parts of a roller 34 and a blade 35. With this arrangement, it is possible to prevent the volumetric efficiency from lowering, and to prevent accident of seizure to the contact parts even if the operation is made at a high rotational speed in a high compression ratio range or if operation is made in a low oil volume range, thereby it is possible to enlarge the possible operation range.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a high pressure dome-shaped rotary compressor.

(Prior Art) Generally, a high-pressure dome-shaped rotary compressor is described in, for example, Japanese Utility Model Application Publication No. 62-89083, and as shown in FIG. 5, a casing (A) has a cylinder chamber (b).
cylinder (B) with front and rear heads (C)
A compression element (E) consisting of (D) is installed inside the cylinder chamber (b), and a roller (H) fitted to an eccentric shaft portion (g) of a drive shaft (G) extending from a motor (F) is installed in the cylinder chamber (b). In addition, the cylinder (B) is provided with a blade that contacts the roller (H).

In addition, the cylinder chamber (b) is supplied with oil dissolved in the refrigerant or oil from the bearing part, but when operating at a high rotation speed in a high compression ratio region, When operating in a low oil circulation area, the cylinder chamber (b) cannot be sufficiently cooled with the above oil supply amount, and the internal temperature of the cylinder chamber (b) becomes high. , the contact area between the roller (H) and the blade may reach a high seizure limit temperature, leading to a seizure accident.

Therefore, conventionally, in order to prevent seizure accidents between the roller (H) and the blade, a refrigerant injection method is used in which liquid refrigerant that has been heat exchanged with a condenser is injected into the cylinder chamber (b) from the middle of the refrigerant pipe. An oil injection method is known in which oil in an oil reservoir (a) provided at the inner bottom of the casing (A) is cooled outside the casing (A) and then injected into the cylinder chamber (b). By the way, the refrigerant injection method described above not only requires an injection circuit that connects the cylinder chamber (b) and the refrigerant pipe, but also requires a solenoid valve to be provided in this circuit, and a method for controlling the opening and closing of the solenoid valve. It is necessary to provide means, etc., and there is a problem that the piping structure becomes complicated. Therefore, an oil injection method as shown in FIG. 5 is usually adopted. That is, an oil pipe (K) opened to the oil reservoir (a) is connected to the suction pipe (J) connected to the cylinder chamber (b), and an oil cooler (K) is installed in the middle of this oil pipe (K). L) and throttle valve (M
), and the oil cooled by the oil cooler (L) is injected into the cylinder chamber (b) together with the refrigerant gas through the suction pipe (J).

(Section H to be solved by the invention) However, the oil injection method as described above is intended to cool the inside of the cylinder chamber (b), and also to cool the oil from the oil pipe (K). Since the oil is injected into the suction pipe (J), the oil is injected into the suction pipe (J).
) There was a problem that the amount of refrigerant gas sucked into the cylinder chamber (b) was reduced, resulting in a decrease in volumetric efficiency.
Further, there was a problem in that the lubrication condition at the contact portion of the blade with the roller (H) was not sufficiently improved.

The present invention was made in view of the above-mentioned problems, and its purpose is to operate at high rotational speeds in a high compression ratio region or in a low oil circulation amount region without reducing volumetric efficiency. Even when driving, a simple piping configuration can reliably prevent seizure accidents at the contact area between the rotor and blades.
An object of the present invention is to provide a high-pressure dome-shaped rotary compressor that can expand its operating range.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a casing (
1), a cylinder (31) having a cylinder chamber (31a);
A compression element (3) having a front head (32) and a rear head (33) is installed inside the cylinder chamber (31).
a) is equipped with a roller (34) that fits into the eccentric shaft portion (21a) of the drive shaft (21), and the cylinder (3)
1) a blade (35) that contacts the roller (34);
In the high-pressure dome-shaped rotary compressor, an oil intake passage (4) communicating with the oil reservoir (1a) is provided in at least one of the front head (32) and the rear head (33), and the Cylinder chamber (3
After the suction stroke in step 1a) is completed, the compression chamber opens to an area where the internal pressure is lower than the oil reservoir (1a) of the casing (1), and supplies oil to the contact area between the roller (34) and the blade (35). An oil injection boat (5) is provided, and this oil injection boat (5) is communicated with the oil inject/input passage (4).

Further, the cylinder (31) is provided with an oil introduction pipe (6) that opens into the oil reservoir (1a), and this oil introduction pipe (
6) may be provided with a communication passage (7) that communicates with the oil injection scene passage (4).

Furthermore, an external communication pipe (8) communicating with the oil sump (1a)
It is also possible to provide a connecting pipe (8) to communicate with the oil injector passageway (4), and also to interpose an oil cooler (9) in the external connecting pipe (8).

(Function) The roller (34) inside the cylinder chamber (31a)
After the compression chamber formed between the casing (1) and the blade (35) has completed the suction stroke, the internal pressure is
When the oil sump (1a) is in a region lower than the oil sump (1a), the oil in the oil sump (1a) flows into the cylinder via the injection passage (4) and the oil injection port (5) due to the pressure difference between the two. The oil is injected into the chamber (31a), and the contact area between the rotor (34) and the blade (35) is forcibly refueled to improve the lubrication state at the contact area, thereby preventing seizure. Even when operating at a high rotational speed in a compression ratio region or in a low oil circulation region, it is possible to prevent seizure accidents at the contact portion and expand the operating range. Since oil is forcibly injected into the chamber (31a) after the compression chamber has completed its suction stroke, the volumetric efficiency does not decrease.

Further, the cylinder (3) is provided inside the casing (1).
1), an oil introduction pipe (6) opened to the oil reservoir (1a).
) and a communicating passageway (7) that communicates this oil inlet pipe (6) with the oil injector passageway (4), without providing any piping outside the casing (1). With a simple internal piping configuration, the oil reservoir (
1a) into the cylinder chamber (31a).

Furthermore, an external communication pipe (8) communicating with the oil sump (1a)
is provided to communicate the communication pipe (8) with the oil injector passage (4), and when installing an oil cooler (9) in the external communication pipe (8), this cooler (9) is installed.
) is injected into the cylinder chamber (31a), and the rotor (3) of the blade (35) is injected into the cylinder chamber (31a).
4) It is possible to improve the lubrication state at the contact area and also to provide sufficient cooling, which further prevents seizure accidents at the contact area.

(Example) The high-pressure dome-shaped rotary compressor shown in FIG. A compression element (3) is provided on the lower side of the compressor. This compression element (3) is a cylinder (31) having a cylinder chamber (31a) inside.
and front and rear heads (32) and (33) that are in contact with the upper and lower parts of the cylinder (31), and an eccentric shaft portion (21a) of the drive shaft (21) is provided in the cylinder chamber (31a). The cylinder (3J) is provided with a blade (35) that comes into contact with the roller (34). The eccentric rotation of the roller (34) as the drive shaft (21) drives the suction pipe (
10) into the cylinder chamber (31a) is compressed in a compression chamber (X) formed between the roller (34) and the blade (35).

Further, the oil reservoir (1) is provided inside the drive shaft (21).
A oil supply passage (22) is formed which is open to the drive shaft (21), and the oil that is pumped up by the lower oil pickup (23) of the drive shaft (21) is transferred to the drive shaft (21) through the oil supply passage (22). ) to supply oil to the bearings, etc.

However, the one shown in Fig. 1 is a high-pressure dome-shaped rotary compressor with eight front heads (three
An oil injector passage (4) is provided inside the casing (2), and the injector passage (4) is communicated with the bottom oil sump (1a) of the casing (1), and the front head (32) is provided with: The roller (34) and the blade (35) communicate with the injection passageway (4), and the roller (34) and the blade (35)
An oil injection port (5) for forcibly supplying oil from the oil reservoir (1a) is formed at the contact area with the oil reservoir (1a). As shown in detail in FIG. 3, this injection port (5) is connected to the roller (34) in the cylinder chamber (31a) and the blade on the rotation locus of the roller (34) in the front head (32). The port (5) is closed by the upper end surface of the roller (34) until the compression chamber (X) formed between the roller (35) and the
After the contact part with the wall of the cylinder chamber (31a) in 4) passes through the suction port (31b) of the cylinder (31), the port (5) is opened and the compression chamber (X) is opened. It is formed in a region where the internal pressure is lower than that of the oil sump (1a). Under such conditions, the oil sump (
After the refrigerant suction stroke, the oil in 1a) flows between the injector passageway (4) and the oil injection port (
5) into the cylinder chamber (31a), and the contact portion between the roller (34) and the blade (35) is injected into the cylinder chamber (31a) without causing a decrease in volumetric efficiency in the compression chamber (X). In addition, in a region where the internal pressure of the compression chamber (X) is higher than the oil reservoir (1a), the injection port (5) is connected to the roller (3).
4) is closed at the upper end surface to prevent the compressed refrigerant in the compression chamber (X) from flowing back toward the oil reservoir (1a). The above will be described in further detail below.

In FIG. 4, the internal pressure (k) of the cylinder chamber (31a) is plotted on the vertical axis.
g/cj), and the horizontal axis is the crank rotation angle (θ) of the drive shaft (21), which shows the refrigerant gas compression characteristics of a certain model.As is clear from this figure, when the crank rotation angle is approximately The internal pressure of the cylinder chamber (31a) reaches its maximum at around 210 degrees, and the internal pressure of the cylinder chamber (31a) reaches its maximum at around 240 degrees.
Compressed gas is discharged from the oil reservoir (1a), and this discharged gas maintains the oil in the oil reservoir (1a) at a constant high pressure.
The injection port (5) opened into the cylinder chamber (31a) is located in an area lower than the hydraulic pressure of the oil reservoir (1a), that is, the crank rotation angle is 210 degrees or less, and is located in the cylinder chamber (31a). 31a) has completed its suction stroke, that is, within the range of approximately 32 degrees or more of crank rotation angle, the injector 4 (4) and the compression chamber (
The port (5) is formed so as to communicate with X).

Note that the opening position of the injection port (5) changes depending on each model.

Then, after the compression chamber (X) formed between the roller (34) and the blade (35) inside the cylinder chamber (31a) completes the suction stroke, the internal pressure is reduced to the oil sump ( Ia) When in a lower region, for a certain period of time (T) shown from point (a) to point (b) in Figure 4,
Said injection scene passage (4) and oil injection port (5)
The oil in the oil reservoir (1a) is injected into the cylinder chamber (31a) through the oil reservoir (1a). As described above, by injecting oil into the cylinder chamber (31a) after the compression chamber CX') has completed the suction stroke, the roller (34
) and the blade (35) can be forcibly supplied with lubricating oil to the contact area.

Furthermore, in order to communicate the oil injection scene passage (4) provided in the front head (32) with the oil reservoir (1a), the first rI! As shown in J, an oil introduction pipe (6) equipped with a filter (61) is installed vertically on the lower side of the cylinder (31) inside the casing (1),
This oil introduction pipe (6) is opened into the oil reservoir (1a), and a communication passage (7) extending vertically is formed inside the cylinder (31), so that the communication passage (7) is The parts are respectively connected to the indoor air passageway (4) and the oil introduction pipe (6). When adopting such a configuration, the oil in the oil reservoir (1a) is transferred from the injection port (5) to the cylinder using a sparse internal piping configuration without providing any piping outside the casing (1). Room (31
It is possible to forcibly inject into a).

Furthermore, in order to communicate the oil inject/B passageway (4) and the oil reservoir (1a), the steps shown in FIGS.
As shown in the figure, an external communication pipe (8) equipped with a filter (81) that opens into the oil sump (1a) is connected to the bottom of the case song (1). )
is connected to the oil injection scene passage (4) through a communication passage (82) formed in the cylinder (31), and an oil cooler (9) made of a spiral tube or the like is connected to the external communication pipe (8). It is also possible to intervene. When adopting such a configuration, oil cooled by the cooler (9) flows from the injection port (5) into the cylinder chamber (31a).
), it is possible to forcibly supply oil to the contact area between the roller (34) and the blade (35) and to cool the inside of the cylinder chamber (31a).

In the above embodiment, the front head (32)
Although the oil injection passage (4) and the oil injection port (5) were provided on the side, these oil injection passages (
4) and the oil injection port (5) are connected to the rear head (33).
) side, and the oil injection passage (4) and oil injection port (5) may be formed in both the front and rear heads (32) and (33), respectively. be.

(Effects of the Invention) As explained above, in the high pressure dome type rotary compressor of the present invention, the front spatula F (32) and the rear head (32)
3) is provided with an oil injector passage (4) communicating with the oil reservoir (1a) of the casing (1), and the internal pressure is maintained in the compression chamber after the suction stroke in the cylinder chamber (31a). An oil injection port (5) is provided which opens in a region lower than the oil droplet (1a) and supplies oil to the contact area between the roller (34) and the blade (35), and this oil injection port (5) is connected to the oil injector. Scene passage (4)
The cylinder chamber (31a) is not intended to be cooled, but the contact portion between the roller (34) and the blade (35) in the boundary lubrication area is forcibly supplied with oil. Therefore, the lubrication state at the contact portion can be improved by forcefully supplying oil to the contact portion between the rotor (34) and the blade (35) with a simple piping configuration without reducing the volumetric efficiency. , it is possible to prevent burn-out accidents. Therefore, even when operating at a high rotational speed in a high compression ratio region or in an oil paper circulation amount region, seizing accidents between the roller (34) and the blade (35) can be prevented and the operating range can be expanded.

Furthermore, a cylinder (31) is provided inside the casing (1).
An oil introduction pipe (6) that opens into the oil reservoir (1a) is provided, and a communication passage (7) is provided that communicates the oil introduction pipe (6) with the oil injection date passage (4). Therefore, the oil reservoir (1a
) can inject oil into the cylinder chamber (31a).

Furthermore, an external communication pipe (8) communicating with the oil sump (1a)
The communication pipe (8) is connected to the oil injector passageway (4), and the external communication pipe (8) is provided with an oil cooler (9) to perform forced oil supply. Not only can the oil cooled by the cooler (9) be injected into the cylinder chamber (31a), the cylinder chamber (31a) can also be cooled well. ) and the blade (35) can more effectively prevent seizure at the contact area.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the main parts of a high-pressure dome-shaped rotary compressor according to the present invention, FIG. 2 is a longitudinal sectional view showing another embodiment, and FIG. 3 is a cross-sectional view of the main parts. FIG. 4 is an explanatory diagram illustrating changes in cylinder internal pressure of a rotary compressor, and FIG. 5 is a sectional view showing a conventional example. (1) Conflict... (1a)...- (21)@... (21a)... (3)... (31)... ・Casing oil sump, drive shaft, eccentric shaft section・Compression element/cylinder (31a)...Cylinder chamber (32)...Front head (33)/0/Fist rear head (34)...Roller (35)...Φ blade (4)...・Fist/oil injector 1 passage (5)...
... Oil injection boat (θ) ... O oil introduction pipe (7) ... Communication path (8) ... External communication pipe (9) ... Oil cooler No. 3 Figure 4 Figure 7 Rashif riiJt angle (θ)

Claims (1)

[Claims] 1) A compression element (3) having a cylinder (31) having a cylinder chamber (31a), a front head (32), and a rear head (33) is installed in the casing (1), and The eccentric shaft portion (
21a), and a roller (34) that fits into the roller (34) is installed inside.
In a high-pressure dome-shaped rotary compressor in which the cylinder (31) is provided with a blade (35) that contacts the roller (34), an oil sump (1a) is provided in at least one of the front head (32) and the rear head (33). ), and an oil injection passage (4) communicating with the oil sump (1a) of the casing (1) is provided in the compression chamber after the suction stroke in the cylinder chamber (31a) is completed.
) An oil injection port (5) is provided which opens in a lower area and supplies oil to the contact portion between the roller (34) and the blade (35), and this oil injection port (5) is connected to the oil injection passage (4). A high-pressure dome-shaped rotary compressor characterized by communication. 2) The cylinder (31) is provided with an oil introduction pipe (6) that opens into the oil reservoir (1a), and a communication passage (7) that communicates the oil introduction pipe (6) with the oil injection passage (4). The high-pressure dome-shaped rotary compressor according to claim 1. 3) An external communication pipe (8) communicating with the oil reservoir (1a) is provided, and the communication pipe (8) is communicated with the oil injection passage (4), and an oil cooler (8) is provided in the external communication pipe (8). 9
2. The high-pressure dome-shaped rotary compressor according to claim 1, further comprising: