JPH04143482A - Compressor with rolling piston - Google Patents

Abstract

PURPOSE:To decrease the number of components used, use the intra-casing space effectively, and enhance the operating performance of a compressor by extending a discharge valve from its mount part till discharge ports, and forming at the foremost a plurality of valve parts to open and close the discharge ports. CONSTITUTION:In an intermediate partition part 7 a discharge hole 7b is provided for putting discharge spaces 5j, 6j of cylinders 5a, 6a in communication, and a discharge valve 14 is installed by its mount part 14a onto the side wall of this discharge hole 7b, and at the foremost of this discharge valve 14 a plurality of valve parts are formed to open and close discharge ports 5k, 6k. This enables a single discharge valve 14 to perform opening and closing of the discharge ports 5k, 6k. Thus the discharge valve and its mount seat etc. in compressor bodies 5, 6 can be designed commonly, which should decrease the number of compressor components as a whole and permit associatedly effective utilization of the intra-casing space.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a rolling piston compressor, and in particular,
The present invention relates to a compressor including a plurality of compressor bodies.

(Prior Art) Generally, as one type of compressor installed in a refrigerator or the like, a rolling piston type compressor as shown in Japanese Patent Application Laid-Open No. 167095/1983 is known.

Further, as an example of this type of compressor, there is a two-cylinder type compressor as shown in FIG. This compressor has two compressor bodies (b) connected to an electric motor (not shown) within a casing (a).

(C) is housed. The compressor bodies (b) and (c) are disposed on both upper and lower sides of a middle plate (d) fixed to the inner peripheral surface of the casing (a). Each compressor main body (b) (C) has a cylinder (
A rolling piston (f) is eccentrically provided in the cylinder (e) of the upper first compressor body (b).
A front plate (g) is attached to the upper end surface, and a lever plate (h) is attached to the lower end surface of the cylinder (e) of the lower second compressor main body (C).
) Compression chambers (A) and (B) are formed between the inner peripheral surface of the rolling piston (f) and the outer peripheral surface of the rolling piston (f). Furthermore,
The cylinder (e) is provided with a blade (not shown) that can freely move in and out of the cylinder (e), while a crankshaft (j) extending from the electric motor is inserted into the rolling piston (f). . In addition, each compression chamber (A
).

A fluid suction path and a fluid discharge path (k) (not shown) are connected to (B). and the front plate (g)
and the rear plate (h), penetrating both the upper and lower sides thereof,
and each compressor body (b).

Discharge holes (1)) communicating with the discharge passage (k) of (C) are formed respectively, and each discharge hole 07) is provided with a discharge valve (m) that is closed by the pressure in the discharge passage (k). It is set up.

Further, each plate (g), (h) is provided with a mounting seat (n) for mounting this discharge valve (m). Furthermore, the front plate (g) and rear plate (h
) are each fitted with a muffler (o) that attenuates the discharge pulsation of the discharged gas discharged from each discharge hole (it) and reduces the discharge noise.

When the compressor is driven, fluid flows into the cylinder (e) from the suction path, and the fluid is compressed by changing the volumes of the compression chambers (A) and (B) by the rotation of the rolling piston (f). After that, it is discharged into the internal space (C) of the casing (a) through the discharge path (k) and the discharge hole (U').

(Problem to be Solved by the Invention) However, in the compressor as described above, each of the compressor bodies (b) and (c) has an individual discharge valve (
m), (m), valve mounting seat (n).

(n) and mufflers (0) and (0),
This led to an increase in the number of parts for the compressor as a whole. Furthermore, it is difficult to say that the space within the casing is being utilized effectively, as it is necessary to ensure a space for each of these members.

The present invention has been made in view of the above, and an object of the present invention is to reduce the number of parts of a compressor and to effectively utilize the space inside the casing.

(Means for Solving the Problems) In order to achieve the above object, the present invention shares the discharge valves of a plurality of compressor bodies.

Specifically, the measures taken by the invention according to claim (1) include a drive means (3) and a drive means (3) inside the casing (2).
), the compression means (4) being connected to at least two compressor bodies (5),
(6), each compressor body (5), (6) is installed in a rolling piston (5b) in a cylinder (5a), (6a).
), (6b) are housed eccentrically, and the driving shaft (3b) of the driving means (3) is fitted into the rolling piston (5b), <6b), while the cylinder (5a)
.

A front head section (8) is attached to one end surface of (6a), a rear head section (9) is attached to the other end surface of each cylinder (5a), (6a).
) between the inner circumferential surfaces of the cylinders (5a), (6a) and the outer circumferential surfaces of the rolling pistons (5b), (6b).
5c), (6c) are formed. In addition, the compression chamber (5
c), (6c), fluid suction path (5d), (
6d) and the discharge port (5k), (6k)
The discharge spaces (5j) and (6j) are connected via the rolling piston (5j) as the driving means (3) is driven.
b).

It is assumed that (6b) is a rolling piston type compressor in which cylinders (5a) and (6a) rotate to compress fluid. The intermediate partition (7) is provided with a discharge space (5j) of each cylinder (5a), (6a).
) and (6j) are provided, while a discharge valve (14) is attached to the side wall of the discharge hole (7b) at the attachment part (14a) of the discharge valve (14), The discharge valve (14) is connected to each of the discharge ports (5k) from the mounting portion (14a).

(6k), and the tip of the discharge port (5k).
), a plurality of valve parts (14b) that open and close (6k), (
14b).

Further, the means taken by the invention according to claim (2) is such that in the rolling piston type compressor according to claim (1), each rolling piston (5b), (6b) is connected to the axial center of the drive shaft (3b). The eccentric direction is set to be different for each.

(Function) With the above configuration, in the invention according to claim (1), the rolling pistons (5b) and (6b) of the compression means (4) rotate as the drive means (3) is driven, and the suction passage ( 5
d), (6d) to the compression chamber (5c).

Fluid flows into (6C) and compresses the fluid. Thereafter, this compressed fluid is discharged into the discharge space (5j).

(6j) respectively. And the middle section (7)
The discharge space of each cylinder (5a), (6a) (
A discharge hole (7b) is provided that communicates with the discharge hole (7b), and a discharge valve (14) is connected to the mounting portion (14a) of the discharge valve (14) on the side wall of the discharge hole (7b). ), and the discharge valve (14) has the discharge port (5k) at its tip.

A plurality of valve parts (14b) that open and close (6k), (14
b), one discharge valve (14
) can be used to open and close the respective discharge ports (5k) and (6k). Therefore, each compressor body (5), (
The discharge valve and the mounting seat of the discharge valve in 6) can be made common, and the number of parts for the compressor as a whole can be reduced.
With this reduction in the number of parts, the space inside the casing can be used effectively.

In addition, in the invention described in claim (2), the eccentric directions of the rolling pistons (5b) and (6b) with respect to the axial center of the drive shaft (3b) are set to be different, so that each discharge space ( 5j).

(6j) can function as a phase interference type muffler x, and can attenuate discharge pulsation and reduce discharge noise.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a rolling piston compressor (1) according to the present invention has a driving means (3) in a casing (2).
) and a compressor main body (4) as a compression means are housed.

The drive means (3) consists of an electric motor (3a) and a crankshaft (3b) as a drive shaft.

The electric motor (3a) operates in the internal space (
a stator (3c) disposed on the upper part of the casing (2a) and fixed to the inner circumferential surface of the casing (2);
The rotor (3d) is arranged at the center of the rotor. The crankshaft (3b) has its upper end connected to the center of the rotor (3tH), and its lower end extended downward and connected to the compressor main body (4).

Furthermore, lubricating oil (0) is stored at the bottom of the casing (2), and the lower end of the crankshaft (3b) and the lower part of the compressor body (4) are immersed in this lubricating oil (0). ing. A fuel tank (not shown) is disposed near the lower end of the crankshaft (3b), and the compressor (1
), this oil supply pump supplies lubricating oil (0)
is supplied to the sliding parts of the compressor body (4).

The compressor main body (4) has a fixed blade shape, and consists of a first compressor main body (5) and a second compressor main body (6) arranged vertically below the electric motor (3a). ing. Also,
A middle plate (7) as an intermediate partition fixed to the inner peripheral surface of the casing (2) is disposed between the first compressor main body (5) and the second compressor main body (6). ing.

As shown in FIGS. 1 and 2, the first compressor main body (5) includes a rolling piston (5b) housed in a cylinder (5a) fixed to the upper surface of the middle plate (7). At the same time, a front plate (8) as a front head part is attached to the upper end surface of the cylinder (5a), and the inner peripheral surface of the cylinder (5a) and the rolling piston are connected by the middle plate (7) and the front plate (8). (5b) and the first compression chamber (5b).
c) is formed. The cylinder (5a) also has a refrigerant suction passage (5d) that opens into the first compression chamber (5c).
A suction pipe (10a) extending from an accumulator (not shown) is connected to the suction passage (5d). On the other hand, a cam (3e) integrally formed with the crankshaft (3b) is fitted into the rolling piston (5b). Thereby, the rolling piston (5b) is provided eccentrically with respect to the cylinder (5a), and a part of the outer circumferential surface of the rolling piston (5b) is in contact with the inner circumferential surface of the cylinder (5a). . Further, a blade groove (5f) extending in the radial direction of the cylinder (5a) is formed near the arrangement position of the suction passage (5d) in the cylinder (5a).
f), a blade (5g) is disposed in the cylinder (5a) so as to be freely retractable. And this blade (5g
), its tip is pressed against the outer circumferential surface of the rolling piston (5b) by the spring and the pressure of the refrigerant gas, and the first compression chamber (5c) is connected to the low pressure chamber (5h) and the high pressure chamber (5h).
51). Furthermore, a high pressure chamber (
A discharge space (5j) is provided on the 51) side. This discharge space (5j) communicates with the first compression chamber (5C) via a discharge port (5k). In addition, this discharge space (5j
) is formed in such a shape that it passes through both the upper and lower end surfaces of the cylinder (5a).

Further, a through hole (8a) is formed in the front plate (8) and has a diameter slightly larger than that of the crankshaft (3b) and extends in the vertical direction. 3b) is rotatably supported via a metal seal. And this front plate (8)
A discharge hole (8c) penetrating through both upper and lower end surfaces is formed in the first compressor main body (5) corresponding to the upper opening position of the discharge space (5j). Furthermore, a muffler (12) is attached to the upper surface of the front plate (8) to attenuate discharge pulsations and reduce discharge noise of refrigerant gas discharged from the compressor body (4). It has become.

Further, the middle plate (7) is provided with the crankshaft (3).
A through hole (7a) having a slightly larger diameter than the shaft diameter of b) is formed. Further, the middle plate (7) has the same shape in plan view as the discharge space (5j) of the first compressor main body (5), and has an upper and lower opening position corresponding to the lower opening position of the discharge space (5j). A discharge hole (7b) penetrating through both end faces is formed.

The second compressor main body (6) is the first compressor main body (5) described above.
), a rolling piston (6b) is housed in a cylinder (6a) fixed to the lower surface of the middle plate (7), and
A rear plate (9) is attached to the lower end surface of a). Thereby, there is a space between the outer peripheral surface of the rolling piston (6b) and the inner peripheral surface of the cylinder (6a).
c) is formed. Further, a refrigerant suction passage (not shown) is formed in the cylinder (6a) and opens into the second compression chamber (6C), and a suction pipe (10b) is connected to the suction passage. On the other hand, the rolling piston (6b
) has a cam (3b) integrally formed with the crankshaft (3b).
g) is fitted so that a part of the outer circumferential surface of the rolling piston (6b) comes into contact with the inner circumferential surface of the cylinder (6a). Also, this rolling piston (6b)
and the rolling piston (5) of the first compressor main body (5).
b) is set so that the eccentric directions with respect to the axis of the crankshaft (3b) are opposite to each other, thereby improving the dynamic balance when the rolling pistons (5b) and (6b) rotate. is maintained. Also, the cylinder (6a) of this second compressor main body (6)
) is also provided with a blade (not shown) that can freely move in and out of the cylinder (6a). The second compressor main body (6) has a discharge space (5) of the first compressor main body (5).
A discharge space (6j) similar to the discharge space (6j) is formed. This discharge space (6j) communicates with the second compression chamber (6C) via a discharge port (6k). In addition, this discharge space (6j
) is formed to penetrate both upper and lower end surfaces of the cylinder (6a), and its upper opening communicates with the discharge hole (7b) formed in the middle plate (7). On the other hand, the lower opening is closed by a restoring plate (9) serving as a rear head section.

In this way, the discharge hole (8c) of the front plate (8)
, the discharge space (5j) of the first compressor body (5), the discharge hole (7b) of the middle blade (7), and the second compressor body (6).
A refrigerant gas discharge passage (13) is formed by vertically communicating the discharge space (6j) of the refrigerant gas.

In addition, in this discharge passage (13), the discharge space (5j) of the first compressor body (5), the discharge hole (7b) of the middle plate (7), and the discharge space (6) of the second compressor body (6)
The inner wall on the cylinder center side of j) is formed on the same continuous surface.

On the other hand, a discharge pipe (11) leading to a condenser (not shown) is connected to the upper surface of the casing (2), and the high temperature and high pressure refrigerant discharged from the compressor main body (4) is transferred to the discharge pipe (11). It is designed to be led out to the condenser side.

As a feature of the present invention, the middle plate (7)
A discharge valve (14) is attached to the. This discharge valve (
14) opens and closes the respective discharge ports (5k) and (6k) of the first compressor main body (5) and the second compressor main body (6), and is made of metal as shown in FIG. It is made up of a flat plate. Valve portions (14b) are formed at both ends of the discharge valve (14). The valve portions (14b), (14b) are connected to the discharge ports (5k), (6
It is formed into a disk shape corresponding to the shape of the valve part (14b), (14b), and each discharge port (5k
), (6k) can be opened and closed. Furthermore, this discharge valve (14) has a mounting portion (14a) formed at its center, and this mounting portion (14a) is attached to the inner wall of the discharge hole (7b) of the middle plate (7) on the cylinder center side. is screwed to. As a result, the discharge valve (14) can freely open the discharge valve (5k), (6k) depending on the pressure in each compression chamber (5c), (6c), and by opening the discharge valve (14), the discharge valve (14) is discharged into each discharge passage (13). The refrigerant gas is discharged from the discharge hole (8C) of the front plate (8),
After passing through the muffler (12), it is discharged into the internal space (2a) of the casing (2).

Next, the operation of this rolling piston type compressor (1) will be explained.

First, when the electric motor (3a) is driven, this driving force is transmitted through the crankshaft (3b) to each compressor body (5),
(6) rolling piston (5b).

(6b) and the rolling piston (5b) (6
b) rotates within the cylinders (5a), (6a).

As a result, the refrigerant gas flows through each suction pipe (10a), (1
0b), flows into the low pressure chambers (5h) of the first and second compressor bodies (5) and (6) via each suction path (5d).

Thereafter, as the rolling pistons (5b) and (6b) rotate, the low pressure chamber (5h) becomes the high pressure chamber (51), compressing the refrigerant gas, and when the pressure of this refrigerant reaches a predetermined value, this The valve part (1) of the discharge valve (14) is
4b) is opened, and high-pressure refrigerant gas flows into the discharge passage (13).
), it is introduced into the muffler (12), and this muffler (
In 12), after the discharge pulsation is attenuated and the discharge sound is reduced, the discharge is discharged into the internal space (2a) of the casing (2), and then led out to the condenser side through the discharge pipe (11).

In this way, in the compressor (1) of this example, the discharge valves (14) of the first and second compressor bodies (5) and (6) are constructed from one member, so that the valve mounting seat is attached to the middle plate. (7) only needs to be provided at one location, and each compressor body (5),
Since the discharged gas discharged from the compressor (6) flows upward, the muffler (12) only needs to be provided at one location, so the number of parts for the compressor as a whole can be reduced. Further, the rolling piston (5b) of the first compressor main body (5) and the rolling piston (6b) of the second compressor main body (6) are located in opposite directions with respect to the axis of the crankshaft (3b). Therefore, the discharge period from each discharge port (5k) and (6k) is different, and as a result, the discharge passage (13) functions as a phase interference type muffler. Ru. Therefore, it is possible to attenuate the discharge pulsation and reduce the discharge noise within the discharge passage (13), and together with the action of the muffler (12), the attenuation of the discharge pulsation and the reduction of the discharge noise are more reliably achieved. can be done.

Note that although the compressor (1) of this embodiment was equipped with two compressor bodies (5) and (6), the first and second compressor bodies, the present invention is not limited to this. , it may be adopted in a compressor equipped with three or more compressor bodies (4). Further, for example, in the case of a compressor having three compressor bodies, it is desirable that the eccentric direction of each rolling piston with respect to the axis of the drive shaft be eccentric at intervals of 1200 degrees.

(Effects of the Invention) As described above, according to the present invention, the following effects are exhibited.

In the invention described in claim (1), since each discharge port can be opened and closed using one discharge valve, the discharge valve and the mounting position of the discharge valve can be made common, and the entire compressor The number of parts can be reduced, and the space within the casing can be effectively utilized due to the reduction in the number of parts, and the performance of the compressor can be improved as the volumetric efficiency is improved.

Furthermore, in the invention described in claim (2), by setting the eccentric directions of the driving shafts of the respective rolling pistons to be different from each other with respect to the axial center, each discharge space can function as a phase interference type muffler. Therefore, it is possible to effectively attenuate the ejection pulsation and reduce the ejection sound.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing the internal structure of a rolling piston compressor;
FIG. 2 is a cross-sectional view of the first compressor main body, and FIG. 3 is a perspective view of the discharge valve. FIG. 4 is a diagram corresponding to FIG. 1 in the conventional example. (1)...Rolling piston type compressor (2)...
Casing (3)...Drive means (3b)...Crankshaft (drive shaft) (4)...Compressor body (compression means) (5)...First compressor body (6)...・Second compressor main body (5a), (6a)... cylinder (5b),
(6b)...Rolling piston (5C)...1st
Compression chamber (6c)...Second compression chamber (5d), (6d)...Suction passage (5j), (6j)...Discharge space (5k), (6k)...Discharge port (7 )...middle plate (middle partition) (7b)
...Discharge hole (8)...Front plate (front head part) (
9)...Rear plate (rear head part) (14)...
・Discharge valve (14a)...Mounting part (14b)...Valve part diagram

Claims (2)

[Claims] (1) A driving means (3) and a compression means (4) connected to the driving means (3) are housed in the casing (2),
The compression means (4) comprises at least two compressor bodies (
5), (6), each compressor body (5), (6)
The rolling pistons (5b) and (6b) are eccentrically housed in the cylinders (5a) and (6a), and the driving shaft of the drive means (3) is attached to the rolling pistons (5b) and (6b). (3b) is fitted, while a front head portion (8) is fitted on one end surface of the cylinders (5a), (6a), and a rear head portion (9) is fitted on the other end surface of each cylinder (5a), (6a). 6a) Intermediate partitions (7) are respectively arranged and formed between the cylinders (5a), (6a) and the outer peripheral surfaces of the rolling pistons (5b), (6b) to form compression chambers. (5c), (6c) are formed, and the compression chambers (5c), (6c) have fluid suction paths (5d), (6c).
d) are connected and the discharge ports (5k), (6k)
The discharge spaces (5j) and (6j) are connected to each other through the cylinders (5a) and (6a), and as the driving means (3) is driven, the rolling pistons (5b) and (6b) are connected to the cylinders (5a) and (6a).
In a rolling piston type compressor that rotates within the compressor to compress fluid, each cylinder (5a), (6
Discharge holes (5j) and (6j) communicating with each other in a)
7b), and a discharge valve (14) is provided on the side wall of the discharge hole (7b), and a mounting portion (
14a), and the discharge valve (14) is
From this mounting part (14a) to each of the discharge ports (5k), (6
k), and the discharge port (5k), (
A rolling piston type compressor characterized in that a plurality of valve parts (14b), (14b) are formed to open and close the valve 6k). (2) In the rolling piston compressor according to claim (1), the rolling pistons (5b) and (6b) are set to have different eccentric directions with respect to the axial center of the drive shaft (3b). Features a rolling piston compressor.