JPH0714171U - Swash plate type compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a swash plate compressor that can improve pressure loss and is excellent in durability and basic characteristics. [Structure] A space 4a which is connected to a front suction chamber 11a provided in a front housing 11 and a head suction chamber 12a provided in a rear housing 12 to form a communication passage.
Is provided on the rotary shaft 4. In this swash plate compressor, a communication passage other than the intake gas passage H that has been conventionally used is formed,
Since the suction gas is directly supplied from the head suction chamber 12a to the front suction chamber 11a through the space 4a, the fluid pressure loss of the suction gas is improved and the flow path of the suction gas passes through the swash plate chamber 13. Since they exist independently of those that pass through, the influence of heating in the swash plate chamber 13 is mitigated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a swash plate compressor used for an air conditioner or the like.

[0002]

[Prior art]

 Conventionally, this type of swash plate compressor includes, for example, one shown in FIG. In this swash plate type compressor, a rotary shaft 4 having a swash plate 3 fixed thereto is supported by a pair of front and rear cylindrical cylinder blocks 1 and 2 which are tightened and joined by bolts 19. A plurality of cylinder bores 5 are formed at the separated positions. A double-headed piston 7 is reciprocally slidably housed in a cylindrical bore 5 which forms a pair in front and rear of this, and a shoe 8 is interposed between the double-headed piston 7 and the swash plate 3. A suction chamber (front suction chamber) 11a, a discharge chamber 11b, and a suction chamber (front suction chamber) 11a, which are joined and fixed to both cylinder blocks 1 and 2 via valve plates 9 and 10, respectively. The head suction chamber 12a and the discharge chamber 12b are formed by partition walls.

The suction chambers 11 a and 12 a communicate with the swash plate chamber 13 via a suction gas passage H that extends axially outside the rotary shaft 4, and the suction ports 9 a and 10 a on the valve plates 9 and 10 are connected to each other. It is connected to the cylinder bore 5 via. Here, the suction chambers 11a and 12a form a communication passage by communicating with the suction gas passage H and the swash plate chamber 13, and one end of the suction gas passage H on the rear housing 12 side is connected to the suction chamber 11a. The discharge chambers 11b and 12b are connected to the cylinder bore 5 via discharge ports 9b and 10b on the valve plates 9 and 10. The suction ports 9a and 10a are opened and closed by a suction valve on the cylinder bore 5 side, and the discharge ports 9b and 10b are opened and closed by a discharge valve on the discharge chamber 11b, 12b side. Thrust bearings 14 and 15 are inserted between the cylinder blocks 1 and 2 and the swash plate 3 between the mutual parts.

In this swash plate compressor, a part of the suction gas (refrigerant gas) introduced into the head suction chamber 12a is introduced into the swash plate chamber 13 via the suction gas passage H on the rear side, and further, the front side. It enters the front suction chamber 11a through the suction gas passage H on the side. When the double-headed piston 7 reciprocates according to the rotation of the rotary shaft 4, the refrigerant gas in the suction chambers 11a, 12a pushes the suction valve and flows into the cylinder bore 5, and the refrigerant gas in the cylinder bore 5 pushes the discharge valve and discharges it. It flows into the chambers 11b and 12b. The refrigerant gas in the discharge chambers 11b and 12b is sent to the outside of the compressor through the discharge passage formed between the cylinders 7 and the discharge holes on the rear housing 12.

[0005]

[Problems to be solved by the device]

 By the way, in the case of the above-mentioned swash plate compressor, there is a problem that the suction gas is liable to cause fluid pressure loss because the structure of the communication passage provided as the flow path for the suction gas on the front housing side is complicated. .

Further, since the flow path of the intake gas passes through the swash plate chamber, the discharge gas flowing from the metal seal portion (valve plates 9 and 10) in the discharge path to the swash plate chamber and between the cylinder and the piston during compression The blow-by gas leaked from the swash plate chamber into the swash plate chamber mixes with the intake gas, and the intake gas in the swash plate chamber is heated. As a result, the cooling capacity is likely to be reduced, and at the same time, the sliding effect between the swash plate and the shoe, the lubrication effect of the refrigerant containing the lubricating oil supplied from the swash plate chamber to the radial bearings and thrust bearings is reduced, and durability is reduced. Is easily degraded.

The present invention has been made to solve the above problems, and its technical problem is to provide a swash plate type compressor that can improve pressure loss and is excellent in durability and basic characteristics. It is in.

[0008]

[Means for Solving the Problems]

 According to the present invention, a head suction chamber and a front suction chamber are respectively provided on both sides in the axial direction of a compression mechanism driven by the rotation of a rotary shaft, and the head suction chamber and the front suction chamber are communicated with each other. In a swash plate compressor having a passage and introducing the suction gas into the head suction chamber, a swash plate compressor including a cavity formed in the rotating shaft as a passage for the suction gas can be obtained.

Further, according to the present invention, in the above swash plate compressor, the cavities extend in the axial direction, and one end is connected to the head suction chamber and the other end is connected to the front suction chamber. You have the opportunity.

Further, according to the present invention, in the swash plate compressor, the communication passage includes an intake gas passage that extends axially outside the rotary shaft, and one end of the intake gas passage is connected to the front intake chamber. The vacant space includes a swash plate compressor connected to the head suction chamber and the suction gas passage, and the communication passage includes a suction gas passage that extends axially outside the rotary shaft.One end of the suction gas passage is the front suction. A swash plate type compressor is obtained, which is connected to the chamber, the cavity extends in the axial direction, and one end of which is connected to the head suction chamber and the other end of which is connected to the suction gas passage.

In addition, according to the present invention, in any one of the above swash plate compressors, the swash plate compressor in which a bearing is provided in a portion connecting the void and the suction gas passage and the suction gas passage are A swash plate compressor having the other end connected to the head suction chamber is obtained.

Further, according to the present invention, in any one of the above swash plate compressors, the compression mechanism is interposed between the swash plate that rotates with the rotating shaft, the reciprocating piston, and the swash plate and the piston. A swash plate type compressor including a shoe and the intake gas passage communicating with a swash plate chamber accommodating a swash plate can be obtained.

[0013]

【Example】

 Hereinafter, the swash plate compressor of the present invention will be described in detail with reference to the accompanying drawings. However, since the basic configuration of this swash plate compressor is basically the same as that of the conventional swash plate compressor described in FIG. 5, the same components are designated by the same reference numerals. It is omitted, and only different points will be described.

In the swash plate compressor of the present invention, the rotary shaft 4 is basically provided with a space serving as a passage for intake gas.

FIG. 1 is a sectional side view showing a swash plate compressor according to a first embodiment of the present invention. In this swash plate compressor, a space 4a extending in the axial direction with respect to the rotary shaft 4 and having one end connected to the head suction chamber 12a and the other end connected to the front suction chamber 11a is provided. The space 4a forms a communication passage that communicates with the head suction chamber 12a and the front suction chamber 11a, separately from the suction gas passage H described above. That is, one end of the space 4a is exposed at one end surface of the rotary shaft 4, and the other end is branched and exposed at a position opposite to the outer peripheral surface of the rotary shaft 4 in the front suction chamber 11a.

In the case of this swash plate compressor, the suction gas is directly supplied from the head suction chamber 12a to the front suction chamber 11a through the space 4a by the communication passage including the space 4a other than the suction gas passage H described above. Since it is supplied to, the fluid pressure loss of the intake gas is structurally improved. In addition, since the flow path of the suction gas exists independently of the passage through the swash plate chamber 13, the influence of heating in the swash plate chamber 13 is greatly reduced.

FIG. 2 is a sectional side view showing a swash plate type compressor according to a second embodiment of the present invention. In this swash plate compressor, a space 4b connected to the rotary shaft 4 in the vicinity of the head suction chamber 12a and the thrust bearing 14 is provided. The space 4b is connected to the head suction chamber 12a and the swash plate chamber 13 near the thrust bearing 14 interposed between the cylinder block 1 and the swash plate 3 to form a communication passage. That is, one end of the cavity 4b is exposed at one end surface of the rotary shaft 4, and the other end is branched, and the outer peripheral surface of the rotary shaft 4 in the vicinity of the thrust bearing 14 is opposed to the opposite position. 14) It is exposed.

In the case of this swash plate compressor, since the open end of the cavity 4b is located near the thrust bearing 14 and the radial bearing, the lubrication effect is improved rather than the pressure loss avoidance. That is, a flow from the open end of the cavity 4b to the swash plate chamber 13 via the thrust bearing 14 and a flow to the suction chamber 11a via the radial bearing on the front side are formed, thereby improving the lubrication of both bearings. It

By the way, as shown in FIG. 3, the same effect can be obtained even if the branch portion at the other end of the cavity 4b is aligned with the position of the thrust bearing 14 to form the cavity 4c. However, in this case, the lubrication of the thrust bearing 14 is particularly improved.

FIG. 4 is a sectional side view showing a swash plate type compressor according to a third embodiment of the present invention. In this swash plate type compressor, a structure in which the respective cavities 4a, 4b, 4c in the first and second embodiments are combined, that is, as shown in FIG. A space 4d connected to the chamber 12a and the vicinity of the thrust bearing 14 is provided.

In the case of this swash plate compressor, the suction gas is directly supplied from the head suction chamber 12a to the front suction chamber 11b through the space 4d by the communication passage including the space 4d other than the suction gas passage H. At the same time, since it is also supplied to the swash plate chamber 13, in this case as well, the fluid pressure loss of the suction gas is improved, the effect of heating in the swash plate chamber 13 is significantly mitigated, and the thrust bearing 14 And the lubrication of the radial bearing is also improved.

[0022]

[Effect of device]

 As described above, according to the swash plate type compressor of the present invention, in addition to the conventional intake gas passage, the space forming the communication passage for the intake gas is provided on the rotary shaft, so that the intake gas fluid In addition to significantly reducing the pressure loss, the effect of heating in the swash plate chamber is significantly reduced, and the lubrication of the bearing is also improved. As a result, the durability of the compressor is improved without deteriorating the cooling capacity and basic performance.

[Brief description of drawings]

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

FIG. 2 is a sectional side view showing a swash plate compressor according to a second embodiment of the present invention.

3 is a cross-sectional side view showing a modification of a main part of the swash plate compressor shown in FIG.

FIG. 4 is a sectional side view showing a swash plate compressor according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional side view showing a conventional swash plate compressor.

[Explanation of symbols]

 1, 2 Cylinder block 3 Swash plate 4 Rotating shaft 4a, 4b, 4c, 4d Vacancy 5 Cylinder bore 7 Double-headed piston 8 Shoe 9, 10 Valve plate 9a, 10a Suction port 9b, 10b Discharge port 11a, 12a Suction chamber 11b, 12b Discharge chamber 13 Swash plate chamber H Intake gas passage

Claims (7)

[Scope of utility model registration request] 1. A communication passage in which a head suction chamber and a front suction chamber are provided on both axial sides of a compression mechanism driven by rotation of a rotary shaft, and the head suction chamber and the front suction chamber communicate with each other. In the swash plate compressor in which the suction gas is introduced into the head suction chamber, the communication passage includes a vacant space formed in the rotating shaft and serving as a passage for the suction gas. Compressor. 2. The swash plate compressor according to claim 1,
The swash plate compressor, wherein the space extends in the axial direction and one end is connected to the head suction chamber and the other end is connected to the front suction chamber. 3. The swash plate compressor according to claim 2,
The communication passage includes an intake gas passage that extends axially outside the rotary shaft, one end of the intake gas passage is connected to the front intake chamber, and the void is the head intake chamber and the intake gas. A swash plate compressor characterized by being connected to a passage. 4. The swash plate compressor according to claim 1,
The communication passage includes an intake gas passage that extends axially outside the rotary shaft, one end of the intake gas passage is connected to the front intake chamber, and the cavity extends in the axial direction and one end A swash plate compressor, wherein the head suction chamber and the other end are connected to the suction gas passage. 5. The swash plate compressor according to claim 3 or 4, wherein a bearing is provided at a portion connecting the void and the intake gas passage. 6. The swash plate type compressor according to claim 3, wherein the other end of the suction gas passage is connected to the head suction chamber. 7. The swash plate compressor according to claim 3, wherein the compression mechanism includes a swash plate that rotates together with the rotary shaft, a reciprocating piston, the swash plate and the piston. And a shoe interposed between the swash plate, and the intake gas passage communicates with a swash plate chamber accommodating the swash plate.