JPH08284815A - Compressor suction mechanism - Google Patents

Abstract

PURPOSE: To provide a suction mechanism of a swash plate-type compressor having the simple structure and the low cost. CONSTITUTION: A plurality of communication grooves 21 extending from a plurality of cylinder bores 4 to the shaft core of a rotary shaft 2 are provided on the end surface of a cylinder head 8 side of a cylinder block 3. Valve plates 5 and a plurality of first communication holes 22 are formed in a plurality of communication grooves 21. A ring-like bush 23 is fixed to the cylinder block 3, communicated with a supporting hole 24 for rotatably supporting the end peripheral surface on one end side of the rotary shaft 2 and a plurality of first communication holes 22, and provided with a plurality of second communication holes 25 extending to the end peripheral surface of the rotary shaft 2. A cutout part 26 for communicating a suction chamber 9 with the second communication holes 25 communicated with the cylinder bores 4 in the suction stroke through the first communication holes 22 only in the time when a plurality of cylinder bores 4 are respectively in the suction stroke is provided on one end of the rotary shaft 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction mechanism for a swash plate compressor, and more particularly to a suction mechanism for a swash plate compressor for vehicle air conditioning.

[0002]

2. Description of the Related Art Generally, a suction mechanism of a swash plate type compressor of this type uses a flapper valve (or a reed valve) as a suction valve. However, it is a well-known fact that an intake mechanism using a flapper valve as an intake valve has a drawback that intake pressure loss, efficiency reduction due to intake refrigerant gas heating, and noise and valve breakage easily occur.

Therefore, in order to eliminate the above-mentioned drawbacks, an intake mechanism using a rotary valve as an intake valve has been proposed (for example, see Japanese Patent Laid-Open No. 5-60063). In this method, the rotary valve is slid with respect to the cylinder block, the cylinder head, and the valve plate (valve plate) between the cylinder block and the cylinder head to perform pressure sealing in the piston compression process. .

[0004]

However, in the above method, it is required to secure an appropriate sliding clearance between the rotary valve and the cylinder block. In order to secure an appropriate sliding clearance, highly accurate coaxiality is required for the rotary valve and the cylinder block. Similarly, proper clearance is required between the valve plate and the rotary valve. In order to obtain an appropriate clearance between the valve plate and the rotary valve, it is necessary to add cutting or polishing to the central hole provided in the valve plate by press working or the like, resulting in high cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a swash plate type compressor suction mechanism having a simple structure and capable of easily ensuring an appropriate sliding clearance between a suction valve and a cylinder block.

[0006]

According to a first aspect of the present invention, a rotating shaft; a cylinder block having a plurality of cylinder bores and rotatably supporting the rotating shaft; corresponding to the plurality of cylinder bores. A valve plate having a plurality of discharge ports and a plurality of discharge valves corresponding to the plurality of discharge ports; and a suction chamber and a discharge chamber, the suction chamber having a gap at one end of the rotary shaft. And a cylinder head joined to one end surface of the cylinder block via the valve plate so that the discharge chamber communicates with the plurality of cylinder bores through the plurality of discharge ports; A swash plate that is swingably attached to the swash plate; and a plurality of pistons that are attached to the swash plate such that the swash plate can reciprocate in the cylinder bores in directions parallel to the rotation axis. By reciprocating the plurality of pistons through the swash plate based on the rotation of the rotary shaft, the refrigerant sucked into the suction chamber is guided to the plurality of cylinder bores, and the refrigerant of the plurality of cylinder bores is transferred to the plurality of cylinder bores. A swash plate compressor that compresses as a compressed refrigerant by a piston and discharges the compressed refrigerant to the discharge chamber, the swash plate compressor being provided in a predetermined portion of the one end surface of the cylinder block, respectively, from the plurality of cylinder bores to the rotary shaft. A plurality of communication grooves facing the shaft center and forming a plurality of first communication holes with the valve plate; fixed to the cylinder block and rotatably supporting an end peripheral surface of the rotary shaft on the one end side. A ring-shaped bush having a support hole and a plurality of second communication holes that communicate with the plurality of first communication holes and reach the end surface of the rotary shaft. The second communication hole formed at the one end of the rotating shaft and communicating with the cylinder bore during the suction process through the first communication hole only while each of the plurality of cylinder bores is in the suction process. And a cutout portion for communicating the suction chamber with each other.

According to a second aspect of the present invention, a rotating shaft;
A cylinder block having a plurality of cylinder bores and rotatably supporting the rotary shaft; a plurality of discharge ports corresponding to the plurality of cylinder bores, and a plurality of discharge valves corresponding to the plurality of discharge ports A valve plate; a suction chamber and a discharge chamber, the suction chamber covers one end of the rotary shaft with a gap, and the discharge chamber communicates with the plurality of cylinder bores through the plurality of discharge ports. A cylinder head joined to one end surface of the cylinder block via the valve plate; a swash plate swingably attached to the rotary shaft; and parallel to the rotary shaft in each of the plurality of cylinder bores. A plurality of pistons attached to the swash plate so as to be capable of reciprocating in various directions; and reciprocating the plurality of pistons through the swash plate based on rotation of the rotary shaft. By guiding the refrigerant sucked into the suction chamber to the plurality of cylinder bores, the refrigerant of the plurality of cylinder bores is compressed as a compressed refrigerant by the plurality of pistons, and the compressed refrigerant is discharged to the discharge chamber. A plurality of compressors, each of which is provided at a predetermined portion of the one end surface of the cylinder block, faces the axis of the rotary shaft from the plurality of cylinder bores, and forms a plurality of first communication holes together with the valve plate. A communication groove; a support hole projecting from another predetermined portion of the one end surface of the cylinder block and rotatably supporting an end peripheral surface of the rotary shaft on the one end side; and the plurality of first communication holes. A ring-shaped protrusion having a plurality of second communication holes that communicate with the rotary shaft and reach the peripheral surface of the end of the rotary shaft; formed on the one end of the rotary shaft; Only during each Daboa is in suction stroke, the suction stroke and the second in communication through the first communication hole in the cylinder bore in the
A notch portion for communicating the suction chamber with the communication hole of
A compressor suction mechanism is obtained.

[0008]

In the first aspect of the present invention described above, the rotary shaft is provided with the intake valve function by providing the notch portion at one end of the rotary shaft. As a result, the cutout portion functions as a rotary valve. Between the notch at one end of the rotary shaft that acts as a rotary valve and the cylinder bore,
By arranging the ring-shaped bush having the second communication hole, it is possible to form a compression process seal between the rotary valve and the cylinder block and between the rotary valve and the valve plate, which is conventionally formed of two or three kinds of parts. Achieved with one part of ring bush. In this way, the rotary shaft slides in the ring-shaped bush press-fitted into the cylinder block, so that the notch portion provided in the rotary shaft and the second communication hole provided in the ring-shaped bush achieve the suction mechanism. did.

In the above-described second aspect of the present invention, the ring-shaped protrusion provided on the cylinder block achieves the same function as the ring-shaped bush described above.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 1, a swash plate compressor according to a first embodiment of the present invention has a rotary shaft 2 rotatably supported by a front housing 1 through a radial bearing 1 '. Multiple cylinder blocks 3 (typically 6)
With a cylinder bore 4 and a rotary shaft 2 with a radial bearing 4 '.
Rotatably supported via. The valve plate 5 has a plurality of discharge ports 6 corresponding to the plurality of cylinder bores 4,
A plurality of discharge valves 7 corresponding to the plurality of discharge ports 6 are provided. The cylinder head 8 has a suction chamber 9 and a discharge chamber 10. The cylinder head 8 has one end of the cylinder block 3 so that the suction chamber 9 covers one end of the rotary shaft 2 with a gap and the discharge chamber 10 communicates with the plurality of cylinder bores 4 through the plurality of discharge ports 6. Valve plate 5 on the end face
Are joined through. The front housing 1 is joined to the other end surface of the cylinder block 3. The swash plate 11 is
In the front housing 1, it is swingably attached to the rotary shaft 2. The plurality of pistons 12 are attached to the swash plate 11 so as to be capable of reciprocating in the plurality of cylinder bores 4 in a direction parallel to the rotation axis 2.

With this structure, the swash plate compressor is
Based on the rotation of the rotary shaft 2, the plurality of pistons 12 are moved to the swash plate 11.
By reciprocating through the suction chamber 9, the refrigerant sucked into the suction chamber 9 is guided to the plurality of cylinder bores 4, the refrigerant of the plurality of cylinder bores 4 is compressed as the compressed refrigerant by the plurality of pistons 12, and the compressed refrigerant is discharged through the discharge port 6. It discharges to the discharge chamber 10 via.

Next, the suction mechanism of the swash plate compressor of FIG. 1 will be described with reference to FIG. 2 while continuing to refer to FIG.

The suction mechanism is provided at a predetermined portion of the one end surface (end surface on the cylinder head 8 side) of the cylinder block 3, and has a plurality of communication grooves 21 extending from the plurality of cylinder bores 4 toward the axis of the rotary shaft 2. . A plurality of communication grooves 21
Form a plurality of first communication holes 22 together with the valve plate 5.

The ring-shaped bush 23 is fixed to the cylinder block 3 and has a support hole 24 for rotatably supporting the peripheral surface of the rotary shaft 2 on the one end side, and a plurality of first communication holes 2.
2 and a plurality of second communication holes 25 that reach the end peripheral surface of the rotary shaft 2. As a material for the ring-shaped bush 23, a material having good sliding characteristics such as a resin material is preferable.

A cutout portion 26 is formed at the one end of the rotary shaft 2.

Continuing to refer to FIGS. 1 and 2, FIG.
With reference to also, the notch portion 26 communicates with the cylinder bore 4 during the suction process via the first communication hole 22 only while each of the plurality of cylinder bores 4 is performing the suction process. It has a function of communicating the suction chamber 9 with the communication hole 25.

2 and 3, the cylinder bore 4
Is in the state immediately after the end of discharge as shown in the figure (that is, the state in which the piston 12 has reached the top dead center position), and the rotation shaft 2 is rotated in the rotation direction indicated by the arrow D (FIG. 3). Then, the notch position of the notch portion 26 with respect to the cylinder bore 4 is as shown in FIG. In FIG. 3, S indicates the suction start position in this cylinder bore 4, and E indicates the suction end position. In the illustrated state, the angle between the suction start position S and the plane defined by the central axis of the cylinder bore 4 and the central axis of the rotary shaft 2 is α, and it is determined by the central axis of the cylinder bore 4 and the central axis of the rotary shaft 2. When the angle between the surface and the suction end position E is β, the angle α is about 70 ° and the angle β is about 170 °. Therefore, the notch angle (β-α) of the notch portion 26 determined by the angle from the angle suction start position S to the suction end position E is about 100 °. As described above, the notch portion 26 is connected to the second communication hole 25 that communicates with the cylinder bore 4 during the suction process via the first communication hole 22 only while the cylinder bore 4 is performing the suction process.
The suction chamber 9 is communicated.

Referring to FIGS. 4 and 5, the second aspect of the present invention is described.
The swash plate compressor according to this embodiment is the same as the swash plate compressor shown in FIGS. 1 to 3 except for the following points. That is, in the swash plate compressor of FIG. 4, the ring-shaped bush 23 is
The ring-shaped bush 23 is made to act as a slide bearing by using a material having good sliding characteristics such as a resin material. By making the ring-shaped bush 23 act as a plain bearing,
In the swash plate compressor of FIG. 4, the radial bearing 4 ′ in FIGS. 1 and 2 is removed.

Referring to FIGS. 6 and 7, the third aspect of the present invention is described.
The swash plate type compressor according to the embodiment of the present invention is similar to the swash plate type compressors of FIGS. It has a plurality of communication grooves 21 extending from the cylinder bore 4 toward the axis of the rotary shaft 2. The plurality of communication grooves 21 form a plurality of first communication holes 22 together with the valve plate 5.

The cylinder block 3 has a ring-shaped protruding portion 23 'protruding from another predetermined portion of the one end surface (the end surface on the cylinder head 8 side) of the cylinder block 3. The ring-shaped projecting portion 23 ′ is similar to the ring-shaped bush 23 of FIG. 2 in that the support hole 24 that rotatably supports the end peripheral surface of the rotary shaft 2 on the one end side and the plurality of first communication holes 22. And a plurality of second communication holes 25 reaching the end peripheral surface of the rotary shaft 2. The ring-shaped protrusion 23 ′ is formed integrally with the cylinder block 3. At the one end of the rotary shaft 2, as in the swash plate compressor shown in FIGS. 2 and 3,
The first communication hole 2 is formed in the cylinder bore 4 during the suction process only while each of the plurality of cylinder bores 4 is performing the suction process.
2 through the second communication hole 25, the suction chamber 9
Is formed with a notch portion 26 for communicating with each other. Figure 6
And the swash plate type compressor of FIG. 7 is the same as that of FIG.
-It is the same as that of the swash plate compressor of FIG. In this way, the ring-shaped protrusion 23 ′ provided on the cylinder block 3 achieves the same function as the ring-shaped bush 23 of FIGS. 1 and 2.

[0022]

As described above, according to the present invention, the suction is performed by the notch portion provided on the rotary shaft and acting as the suction valve and the second communication hole provided on the ring-shaped bush or the ring-shaped protruding portion. Since the mechanism has been achieved, the number of parts that require high precision required to ensure an appropriate sliding clearance between the intake valve and the cylinder block can be reduced, which is advantageous in terms of cost and easy to assemble. Moreover, it becomes easy to secure the sealing property during the compression process.

[Brief description of drawings]

FIG. 1 is a sectional view of a swash plate compressor according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the swash plate compressor of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view of a main part of a swash plate compressor according to a second embodiment of the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a sectional view of a main part of a swash plate compressor according to a third embodiment of the present invention.

7 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols] 1 front housing 1'radial bearing 2 rotating shaft 3 cylinder block 4 cylinder bore 4'radial bearing 5 valve plate 6 discharge port 7 discharge valve 8 cylinder head 9 suction chamber 10 discharge chamber 11 swash plate 12 piston 21 communication groove 22 1st communication hole 23 Ring-shaped bush 23 'Ring-shaped protrusion 24 Support hole 25 Second communication hole 26 Notch part

Claims (5)

[Claims] 1. A rotary shaft; having a plurality of cylinder bores,
A cylinder block that rotatably supports the rotating shaft;
A valve plate having a plurality of discharge ports corresponding to the plurality of cylinder bores and having a plurality of discharge valves corresponding to the plurality of discharge ports; and a suction chamber and a discharge chamber, wherein the suction chamber is the rotary shaft. A cylinder joined to one end face of the cylinder block via the valve plate so that one end of the cylinder block is covered with a gap and the discharge chamber communicates with the plurality of cylinder bores through the plurality of discharge ports. A head; a swash plate swingably attached to the rotation shaft; and a plurality of pistons attached to the swash plate so as to reciprocate in the cylinder bores in a direction parallel to the rotation axis. Comprising, by reciprocating the plurality of pistons through the swash plate based on the rotation of the rotating shaft, to guide the refrigerant sucked into the suction chamber to the plurality of cylinder bores, A swash plate compressor that compresses refrigerant in a plurality of cylinder bores as compressed refrigerant by the plurality of pistons and discharges the compressed refrigerant to the discharge chamber, the swash plate compressor being provided in a predetermined portion of the one end surface of the cylinder block, respectively. A plurality of communication grooves that extend from the plurality of cylinder bores toward the axis of the rotary shaft and that form a plurality of first communication holes together with the valve plate; fixed to the cylinder block and on one end side of the rotary shaft. A ring shape having a support hole for rotatably supporting the end peripheral surface and a plurality of second communication holes communicating with the plurality of first communication holes and reaching the end peripheral surface of the rotating shaft. A bush, which is formed at the one end of the rotary shaft and communicates with the cylinder bore during the suction process via the first communication hole only while each of the plurality of cylinder bores is in the suction process. To be and the second communication hole, the suction chamber, and a notch portion for communicating; compressor suction mechanism, characterized in that it comprises a. 2. The compressor suction mechanism according to claim 1, wherein the ring-shaped bush is made of a resin material. 3. The compressor suction mechanism according to claim 1, wherein the ring-shaped bush acts as a slide bearing. 4. A rotary shaft; having a plurality of cylinder bores,
A cylinder block that rotatably supports the rotating shaft;
A valve plate having a plurality of discharge ports corresponding to the plurality of cylinder bores and having a plurality of discharge valves corresponding to the plurality of discharge ports; and a suction chamber and a discharge chamber, wherein the suction chamber is the rotary shaft. A cylinder joined to one end face of the cylinder block via the valve plate so that one end of the cylinder block is covered with a gap and the discharge chamber communicates with the plurality of cylinder bores through the plurality of discharge ports. A head; a swash plate swingably attached to the rotation shaft; and a plurality of pistons attached to the swash plate so as to reciprocate in the cylinder bores in a direction parallel to the rotation axis. Comprising, by reciprocating the plurality of pistons through the swash plate based on the rotation of the rotating shaft, to guide the refrigerant sucked into the suction chamber to the plurality of cylinder bores, A swash plate compressor that compresses refrigerant in a plurality of cylinder bores as compressed refrigerant by the plurality of pistons and discharges the compressed refrigerant to the discharge chamber, the swash plate compressor being provided in a predetermined portion of the one end surface of the cylinder block, respectively. A plurality of communication grooves that extend from the plurality of cylinder bores toward the axis of the rotary shaft and that form a plurality of first communication holes with the valve plate; project from another predetermined portion of the one end surface of the cylinder block; A plurality of second communicating holes that rotatably support the end peripheral surface of the rotary shaft on the one end side and a plurality of second communicating holes that reach the end peripheral surface of the rotary shaft. A ring-shaped protrusion having a communicating hole; formed on the one end of the rotary shaft, and the cylinder bore in the suction step is provided with the first protrusion only while each of the plurality of cylinder bores is in the suction step. Wherein communicate with each other through the communicating hole of the second communication hole, the suction chamber, and a notch portion for communicating; compressor suction mechanism, characterized in that it comprises a. 5. The ring-shaped protrusion is integrally formed with the cylinder block.
The suction mechanism of the compressor according to 1.