JPH0625575U - Multi-cylinder compressor - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] A multi-cylinder compressor that can suppress the generation of noise by making the refrigerant gas sucked in each cylinder bore uniform and making the compression load of each cylinder uniform Offer. [Structure] A plurality of cylinder bores arranged around one end of one axis for sucking a cooling medium from a suction port is provided, and a suction valve 5 is provided at each open end of the plurality of cylinder bores. Further, a plurality of step-like stoppers 1a, 1b, etc. are provided at the ends of the plurality of cylinder bores as valve opening degree regulating means with which the tip 5a of the suction valve 5 abuts and locks at the time of suction, and the maximum opening of each suction valve is provided. The degree is configured to be set. The position of the stepped stopper 1b of the cylinder bore, which is separated from the suction port, is formed deeper from the opening end so that the maximum valve opening is larger than the position of the stepped stopper 1a of the cylinder bore, which is close to the suction port.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multi-cylinder compressor, and more particularly, to a structure of a suction valve stopper of a multi-cylinder compressor having one cylinder having a plurality of cylinders.

[0002]

[Prior art]

 Conventionally, a rotary swash plate compressor shown in Fig. 3 has been proposed as a multi-cylinder compressor. In FIG. 3, the multi-cylinder compressor has a drive shaft 106 extending to a crank chamber 105 adjacent to a cylinder block 3 having a plurality of cylinders 2 provided at one end of a casing 101. Further, in the crank chamber 105, a swash plate 108 that is rotated by being driven by a rotor 107 provided along the drive shaft 106, and a swing plate 109 that is in sliding contact with the swash plate 108 via a bearing 111. I have it. The swash plate 108 is connected to the drive shaft 106 so that the inclination angle with respect to the drive shaft 106 is variable and rotates together with the drive shaft 106. The oscillating plate 109 is set on the inclined surface of the swash plate 108 so as to be rotatable relative to the swash plate 108, and a piston reciprocating in the cylinder bore 2 is provided around the oscillating plate 109. The piston rod 113 connected to 14 is connected.

When the swash plate 108 is rotated by the rotation of the drive shaft 106, the piston 114 blocks the rotation of the oscillating plate 109 and reciprocates in the cylinder bore 2 by the oscillating motion of the oscillating plate 109. To do. The change in the inclination angle of the swash plate 108 changes the stroke of the piston 114, which changes the compression capacity.

Then, in the cylinder block 3 at one end of the drive shaft 106, a stepped shape is formed at the ends of a plurality of cylinder bores 2 concentrically arranged parallel to each other around the drive shaft, corresponding to the intake valve 5. Each stopper 21 is formed. In the step-like stopper 21, the gas in the suction chamber 17 opens the suction valve 5 and is sucked into the cylinder bore 2 as the piston 14 moves. At this time, the tip of the suction valve 5 hits the step-like stopper 21 and the open position of the suction valve 5 is regulated. A discharge valve 22 and a valve retainer 9 are overlapped and fixed to the discharge hole 12b on the discharge chamber 18 side.

[0005]

[Problems to be solved by the device]

 However, in the above-described multi-cylinder compressor, since the distance from the suction port 19 of the cylinder head 6 to each suction hole 12a is not uniform, the suction pressure of the cylinder bore located farthest from the suction port 19 is Low, the amount of gas sucked in is low. For this reason, the compression load of each cylinder is different, and so-called sidebands occur due to torque fluctuations, causing unpleasant noise in the multi-cylinder compressor.

Therefore, the technical problem of the present invention is to make the refrigerant gas sucked in each cylinder bore uniform and to make the compression load of each cylinder uniform, thereby suppressing the generation of noise. To provide.

[0007]

[Means for Solving the Problems]

 According to the present invention, a suction port serving as a passage for suction refrigerant, a first cylinder bore relatively close to the suction port, a second cylinder bore relatively far from the suction port, and an opening end of the first cylinder bore are provided. A first intake valve, a second intake valve arranged at an open end of the second cylinder bore, and a valve opening restricting means for restricting the maximum opening of the first and second intake valves. In the multi-cylinder compressor, the valve opening degree regulating means sets the maximum opening degree of the second intake valve larger than the maximum opening degree of the first intake valve. A cylinder type compressor is obtained.

According to the present invention, the valve opening restricting means is provided on the inner surface of the first cylinder bore, and serves as a first stopper for locking the tip of the first intake valve during refrigerant intake. A second stopper, which is provided on the inner surface of the second cylinder bore and locks the front end of the second suction valve at the time of sucking the refrigerant, and the second stopper compared to the first stopper. A multi-cylinder compressor is obtained in which is positioned far from the opening end.

According to the present invention, a plurality of cylinder bores arranged in one cylinder block, a suction port common to the plurality of cylinder bores, a plurality of suction valves corresponding to the plurality of cylinder bores in a one-to-one correspondence, and the plurality of suction valves. In a multi-cylinder compressor that includes a valve opening degree control unit that controls the maximum opening degree of the intake valve, the valve opening degree control unit has the maximum intake valve that corresponds to the cylinder bore located farther from the intake port. A multi-cylinder compressor having a large opening is obtained.

According to the present invention, the plurality of suction valves are arranged at the open ends of the plurality of cylinder bores, and the valve opening regulating means is provided on the inner surface of the plurality of cylinder bores for cooling medium suction. At this time, it has a plurality of stoppers for locking the tips of the plurality of suction valves respectively, and the plurality of stoppers are positioned farther from the opening end as far as those provided in the cylinder bore farther from the suction port. A multi-cylinder type compressor characterized by the above is obtained.

[0011]

[Action]

 In the present invention, since the distance from the opening end of the cylinder bore to the stepped stopper is deeper, the stepped stopper of the suction valve is deeper than the cylinder bore located farther from the suction port than the cylinder bore closer to the suction port. A cylinder located far from the low suction port can suck the same amount of cooling gas as a cylinder close to the suction port, and can make the compression load of each cylinder uniform.

[0012]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a multi-cylinder compressor according to an embodiment of the present invention, taken along the plane of a valve plate. In FIG. 1, the discharge valve mechanism 9 and the like are omitted for clarity of explanation. Further, the positions on the circumference of the discharge port 20 and the suction port 19 provided on the cylinder head are indicated by the two-dot chain line.

Between the cylinder bores 2 a, 2 b, 2 b ′, 2 c, 2 c ′, 2 d, 2 d ′ of the cylinder block 3 of the multi-cylinder type compressor and the valve plate 12, radially extend from the center portion. Intake valves 5 are provided respectively to the outside of the cylinder bores 2a, 2b, 2b ', 2c, 2c', 2d, 2d '. The valve plate 12 has a circular suction hole 12a and a circular discharge hole on the cylinder bores 2a, 2b, 2b ', 2c, 2c', 2d, 2d 'and at positions corresponding to the outside and the inside of the suction valve 5. Each hole 12b is provided. The discharge hole 12b provided on the inner side is configured to overlap with the discharge hole 5b provided on the suction valve 5. The cross-sectional view of Fig. 1 shows the same cross section as the conventional one.

FIG. 2A is a vertical sectional view of the cylinder bore portion 2a shown in FIG. 1, and FIG. 2B is a vertical sectional view of the cylinder portion 2d similarly shown in FIG.

As shown in FIG. 2 (a), the valve plate 12, the inner surface of the outer wall 11, the outer surface of the inner wall 15, and the cylinder head inner bottom surface 13 a form the suction chamber 17, and the inner surface of the valve plate 12 and the inner wall 15. The discharge chamber 18 is defined by the cylinder head inner bottom surface 13b. At the time of suction, in the cylinder block 3, the piston 14 descends, and the tip 5a of the suction valve 5 comes into contact with the stepped stopper 1a, which is a valve opening regulating means provided outside the opening of the cylinder bore 2a. Abut and lock. The cylinder bore 2a near the suction port makes the step-like stopper 1a shallow (depth D1) and regulates the maximum opening.

Further, as shown in FIG. 2B, the cylinder bores 2d and 2d ′ located far from the suction port 19 also have their pistons 14 descended during suction so that the tip of the suction valve 5 may be lowered. 5a contacts a step-like stopper 1b provided outside the openings of the cylinder bores 2d and 2d '. However, the step-like stopper 1b provided on the cylinder bores 2d and 2d 'is formed deeper than the step-like stopper 1a of the cylinder bore 2a (depth D2). Therefore, the maximum opening of the suction valve 5 can be increased to increase the refrigerant suction volume more than that shown in FIG. 2 (a).

As described above in detail in the embodiment, the step-like stopper of the cylinder bore 2a near the suction port is made the shallowest, and is gradually deepened as the distance from the cylinder bores 2b, 2b ′, 2c, 2c ′ is increased, and the suction port is gradually increased. By making the step-like stoppers of the cylinder bores 2d, 2d 'furthest to the deepest, the cylinder farthest from the suction port can suck the same amount of refrigerant gas as the cylinder close to the suction port.

Further, since the amount of refrigerant gas sucked into each cylinder can be made uniform, the compression load of each cylinder can be made uniform. As a result, the torque fluctuation of the multi-cylinder compressor becomes constant, and the side band {(7n ± 1) th order, where n is an integer and 7 cylinders} can be reduced.

[0020]

[Effect of device]

 As described above, according to the present invention, since the compression load in each cylinder can be made uniform, the unpleasant noise of the multi-cylinder compressor can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a valve plate of a multi-cylinder compressor according to an embodiment of the present invention.

2A is a vertical sectional view of a cylinder bore 2a shown in FIG. 1. FIG. (B) is the cylinder bore 2d, 2d shown in FIG.
It is a longitudinal cross-sectional view of ′.

FIG. 3 is a cross-sectional view showing a multi-cylinder compressor according to a conventional example.

[Explanation of symbols]

1a, 1b, 21 Stepped stoppers 2, 2a, 2b, 2b ', 2c, 2c', 2d, 2d '
Cylinder bore 3 Cylinder block 5a Tip 5b Discharge hole 5 Suction valve 9 Discharge valve mechanism 11 Outer wall 12 Valve plate 12a Suction hole 12b Discharge hole 14 Piston 15 Inner wall 17 Suction chamber 18 Discharge chamber 19 Suction port 20 Discharge port 22 Discharge valve 105 Crank chamber 106 Drive shaft 108 Swash plate 109 Swing plate 113 Piston rod

Claims (4)

[Scope of utility model registration request] 1. A suction port serving as a passage for suction refrigerant, a first cylinder bore relatively close to the suction port, a second cylinder bore relatively far from the suction port, and an opening end of the first cylinder bore. A multi-cylinder including a first intake valve, a second intake valve arranged at the open end of the second cylinder bore, and a valve opening restricting means for restricting the maximum opening of the first and second intake valves. In the type compressor, the valve opening regulating means sets the maximum opening of the second intake valve larger than the maximum opening of the first intake valve. Machine. 2. The valve opening restricting means is provided on the inner surface of the first cylinder bore, and has a first stopper for locking the tip of the first suction valve when sucking the refrigerant, and the second stopper. It is provided on the inner surface of the cylinder bore, and the second
A second stopper for locking the tip of the intake valve of
The multi-cylinder compressor according to claim 1, wherein the second stopper is positioned farther from the opening end than the first stopper. 3. A plurality of cylinder bores arranged in one cylinder block, a suction port common to the plurality of cylinder bores, a plurality of suction valves corresponding to the plurality of cylinder bores in a one-to-one correspondence, and the plurality of suction valves. In a multi-cylinder compressor including a valve opening regulating means for regulating the maximum opening, the valve opening regulating means sets the maximum opening larger for an intake valve corresponding to a cylinder bore located farther from the intake port. A multi-cylinder type compressor characterized by being operated. 4. The plurality of intake valves are arranged at the open ends of the plurality of cylinder bores, and the valve opening degree regulating means comprises:
A plurality of stoppers, which are provided on the inner surfaces of the plurality of cylinder bores and respectively lock the tips of the plurality of suction valves at the time of sucking the refrigerant, are provided in the cylinder bores far from the suction port. The multi-cylinder compressor according to claim 3, wherein the one is located farther from the opening end.