JP2002202054A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor capable of attenuating suction pulsation or delivery pulsation of the compressor with a simple structure. SOLUTION: One of a suction chamber and a delivery chamber formed on the central side of a rear head is communicated with a corresponding port via a tunnel-shaped communicating passage, and since a muffler space is formed between the tunnel-shaped communicating passage and a pipe connecting part for installing the port, when the communicating passage communicates the suction chamber with the pipe connecting part of a suction port, the suction pulsation can be restrained or prevented, and when the communicating passage communicates the delivery chamber with a pipe installing part of a delivery port, the delivery pulsation can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor having a structure for preventing a pressure wave generated in a suction, compression and discharge stroke of a compression mechanism.

[0002]

2. Description of the Related Art A conventional compressor is disclosed in
No. 1142 discloses a suction port for sucking the refrigerant gas from the evaporator, a suction chamber for containing the refrigerant gas flowing from the suction port, and a sliding shaft that is slidably and tiltably mounted.
At least a swash plate that rotates integrally with the rotating shaft, a piston that reciprocates by the swinging motion of the swash plate, and a cylinder into which the piston is slidably inserted and that appropriately communicates with the suction chamber or the discharge chamber. The swash plate converts the rotation of the rotating shaft into a reciprocating motion of the piston, and the change in the volume of the cylinder, which is changed by the reciprocating piston in the cylinder, sucks and compresses the refrigerant gas in the suction chamber and sends it to the discharge chamber. A compressor for discharging is disclosed.

Further, when the load is minimized, the compressor increases the pressure in the crank chamber to minimize the inclination of the swash plate to minimize the discharge capacity, and at the same time, closes the suction port to change the refrigerant. A clutchless mechanism is provided to stop gas suction and circulate refrigerant gas in the compressor to prevent the evaporator from freezing.

[0004]

However, in the so-called piston reciprocating compressor as described above, the piston reciprocates with the rotation of the swash plate. The valve opens and closes, and suction, compression and discharge are repeated. At this time, a delay in opening / closing of the valve and a fluttering of the valve itself occur, so that a pressure wave is released into a suction chamber or a discharge chamber provided between the suction port and the compression chamber, and furthermore, a resonance frequency in the chamber is induced to cause an emergency. May grow as a strong pulsating wave.

In particular, the pulsation wave on the suction chamber side is 400 Hz to
At a predetermined frequency within the range of 1000 Hz, in combination with the eigenvalue (resonance frequency) of the evaporator, the evaporator main body vibrates, causing unpleasant noise to be transmitted to the passenger compartment, causing a problem. Also, to solve this problem,
In the past, damping mufflers were installed on pipes to reduce suction pulsation, and the suction passage of the compressor was narrowed. However, there was a problem that the cost increased and the performance was reduced. . Also, in the case of a type of air conditioner using a condenser instead of a heater core, the condenser is disposed in the vehicle interior, so that the pulsation wave generated by the discharge pulsation of the compressor also causes vibration in the condenser and causes noise. Had become.

Therefore, an object of the present invention is to provide a compressor that can attenuate suction pulsation or discharge pulsation of the compressor with a simple structure.

[0007]

Accordingly, the present invention provides a housing comprising a front head, a cylinder block and a rear head, a compression mechanism driven by rotation of a drive shaft provided through the front head, and the rear head. And a discharge chamber formed in the rear head and having a discharge opening of the compression mechanism, wherein one of the suction chamber or the discharge chamber is provided. Is formed at the center side of the rear head, and the other of the suction chamber or the discharge chamber is formed outside thereof, and one of the suction chamber or the discharge chamber formed at the center side of the rear head; A tunnel-shaped communication passage is formed that penetrates the other of the suction chamber or the discharge chamber formed outside and communicates with a corresponding port. Lies in the formation of the muffler space between the pipe connection portion to be mounted of the the passage port.

Therefore, according to the present invention, one of the suction chamber and the discharge chamber formed at the center side of the rear head is communicated with the corresponding port through the tunnel-shaped communication passage, and the tunnel-shaped communication is formed. Since a muffler space is formed between the passage and the pipe connection portion where the port is mounted, when the communication passage connects the suction chamber and the pipe connection portion of the suction port, suction pulsation is suppressed or prevented. When the communication passage connects the discharge chamber and the pipe mounting portion of the discharge port, discharge pulsation can be prevented.

In the present invention, it is preferable that the muffler space communicates with an outer end of the communication path.

Further, the tunnel portion defining the communication path may be formed integrally with the rear head, and may be formed by inserting a pipe member separate from the rear head. Is also good.

Further, the compression mechanism is formed in the cylinder block and has a plurality of cylinders each having a suction port communicating with the suction chamber and a discharge port communicating with the discharge chamber, and is capable of reciprocating to and from the cylinder. , A rotary swash plate that rotates together with the drive shaft and reciprocates the piston, and a capacity variable mechanism that can change the angle of the rotary swash plate.

Further, it is preferable that the communication passage is a suction passage that connects the suction chamber and a corresponding suction port. As a result, the pulsation wave on the suction chamber side becomes
Since it is possible to prevent the resonance with the eigenvalue (resonance frequency) of the evaporator, it is possible to particularly suppress or prevent the vibration caused by the evaporator disposed inside the vehicle cabin.

It is preferable that a small hole communicating with the suction passage is formed at a rear end of the muffler space, and oil retained in the muffler space is returned to the suction passage. As a result, the effective volume and effective length of the muffler space can be made constant, so that the capacity of the muffler space can be maintained.

Further, it is desirable that a valve mechanism capable of opening and closing the suction passage by an external signal is provided in the suction passage. With this configuration, even if the piston has a small stroke, the suction path is blocked to prevent freezing of the evaporator, and a so-called clutchless configuration can be obtained.

Preferably, the small hole is opened on the upstream side of the valve mechanism. Thereby, the formation of the bypass passage bypassing the valve mechanism can be prevented, so that the clutchless configuration can be effectively used.

[0016]

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

The compressor 1 shown in FIG. 1 has a housing 5 including a front head 2, a cylinder block 3, and a rear head 4. The rotating shaft 6 penetrates the front head 2 and is rotatably supported by the front head 2 and the cylinder block 3. A crank chamber 7 is defined in the front head 2, and an opening is closed by the cylinder block 3. Further, a valve plate 8 is sandwiched and fixed between the cylinder block 3 and the rear head 4.

A plurality of cylinders 9 are formed in the cylinder block 3 around the rotation shaft 6 so as to extend in the axial direction of the rotation shaft 6. Inlet 10 and outlet 11 formed
The suction port 10 and the discharge port 11 are closed by a valve body. The pistons 12 are slidably inserted into the respective cylinders 9, and the ends of the respective pistons 12 on the crank chamber side are slidably engaged with the rotating swash plate 13. Coupling mechanism 30
It is rotated by a rotating plate 14 fixed to the rotating shaft 6 through the shaft. Also, the rotary swash plate 13
Is mounted on the rotating shaft 6 so that its angle with respect to the rotating shaft 6 can be changed. A baffle plate 31 and a cover 32 are arranged on the outer peripheral portion of the cylinder block 3. The cover 32 defines a discharge passage 15 that communicates with a discharge port (not shown). The baffle plate 31 is provided with a discharge gas passage hole 33 to reduce discharge pulsation.

In the compressor 1 according to this embodiment, a discharge chamber 16 communicating with a discharge port 11 formed in the valve plate 8 is formed outside the rear head 4, and a discharge chamber 16 is formed in the center of the rear head 4. A suction chamber 17 communicating with the suction chamber 10 is formed. Further, the discharge chamber 16 communicates with the crank chamber 7 via a pressure control valve 18 mounted on the rear head 4. The pressure control valve 18 is controlled by an external control signal, and when it is determined that the refrigerating capacity is unnecessary, the power supply to the pressure control valve 18 is stopped and the amount of current supplied as the heat load increases. Is increasing.

Further, on the outer peripheral side surface of the rear head 4,
A suction port 20 into which a suction-side connector 19 to which a pipe from an evaporator (not shown) is connected is formed. The suction port 20 is connected to a communication passage 2 defined by a tunnel 25 formed integrally with the rear head 4.
1 communicates with the suction chamber 17. A closing valve 2 for opening and closing the communication passage 21 is provided on the communication passage 21.
2 is provided so that when it is determined that the refrigerating capacity is unnecessary, the communication path 21 is shut off so that the refrigerant gas is not sucked from the evaporator.

Further, as shown in FIGS. 1 and 2, a muffler space 23 is formed around the tunnel portion 25 defining the communication passage 21. One end of the muffler space 23 opens to the suction port 20, and a small hole 24 communicating with the upstream side of the closing valve 22 of the communication passage 21 is formed at the other end (back end). In addition, the muffler space 23 has a size of about 30 mm around the tunnel portion 25 along the communication passage 21.
It is desirable to be formed in the length of. By setting the distance to about 30 mm, an attenuation peak frequency of about 800 Hz can be obtained. Generally, the muffler space 2 is obtained by the finite element method.
It is desirable to predict the attenuation frequency for the length of the muffler space 3 and to set the length of the muffler space 23 corresponding to the desired attenuation frequency band.

In the compressor 1 having the above-described structure, when the rotating shaft 6 rotates with the rotation of the traveling engine (not shown), the rotating plate 14 fixed to the rotating shaft 6 simultaneously rotates, and the connecting mechanism 30 is moved. The swash plate 13 is rotated and oscillated through the swash plate 13. The piston 12 whose one end is slidably fixed to the rotary swash plate 13 reciprocates with the cylinder 9 as the rotary swash plate 13 rotates and swings. The volume of the compression chamber to be formed is changed. With the change of this compression chamber,
The refrigerant gas is sucked from the suction chamber 17 and compressed, and
To be discharged to As a result, the refrigerant gas evaporated by the evaporator is drawn into the suction chamber 17 from the suction port 20 via the communication passage 21 and compressed, and is sent from the discharge chamber 16 to the next stroke through the discharge passage 15 to, for example, a condenser. Things.

When the heat load is large, the supply of the high pressure to the crank chamber 7 by the pressure control valve 18 is reduced, the crank chamber pressure is reduced, and the back pressure of the piston 12 is reduced. When the stroke of the compressor 12 is increased and the discharge amount of the compressor 1 is increased and it is determined that the refrigerating capacity is unnecessary, a high pressure is supplied to the crank chamber 7 by the pressure control valve 18 and the pressure of the piston 12 is increased. The back pressure increases, the stroke of the piston 12 decreases, and the discharge amount of the compressor 1 decreases. Further, when the heat load is minimum, the communication path 21 is closed by the shut-off valve 22, so that the supply of the refrigerant gas to the suction chamber 17 is stopped, and the refrigerant gas circulates through the compressor 1 to be compressed. The discharge amount of the compressor 1 becomes zero, and a clutchless compressor is configured.

As described above, the refrigerant gas is sucked, compressed and discharged by the suction, compression and discharge strokes of the compressor 1. However, even if the suction stroke is taken, the refrigerant gas is intermittently executed by the plurality of pistons 12. Therefore, pressure fluctuation occurs in the suction chamber 17 and propagates as a pulsating wave to the evaporator side. Usually, since the evaporator is provided in the vehicle interior, when the pulsation wave coincides with the resonance frequency of the evaporator (depending on the type, between 300 Hz and 1000 Hz), there is a problem that the pulsation wave is transmitted to the vehicle interior as unpleasant noise. However, in the present invention, since the muffler space 23 is provided near the communication path 21, the pulsation wave can be attenuated in the frequency band.

Normally, the pulsation wave of the compressor is larger on the high pressure side than on the low pressure side. However, the pulsation wave is usually in the engine room on the high pressure side, and on the low pressure side, the evaporator is arranged in the vehicle interior. Resonance is a problem. However, in an air conditioner of the type using a high-pressure side condenser instead of a heater core, resonance in the condenser becomes a problem as noise. Therefore, when the condenser on the high pressure side of the refrigeration cycle is disposed in the vehicle interior, the discharge chamber is disposed at the center of the rear head 4 and the suction chamber is disposed around the discharge chamber. A communication path for communicating the chamber with the discharge port may be provided, and a muffler space communicating with the communication path may be formed around the communication path. As a result, pulsating waves propagating from the discharge chamber to the condenser side can be attenuated, and resonance in the condenser can be prevented.

A small hole 24 communicating with the muffler space 23 and the upstream side of the closing valve 22 of the communication passage 21 is formed at an inner end of the muffler space 23.
To prevent oil from stagnation. Normally, the damping effect of the muffler space 23 is related to the length (depth) of the muffler space 23. For this reason, if oil stays in the muffler space 23, the depth of the muffler space 23 changes, which causes a problem that the frequency band to be attenuated changes. To prevent stagnation.

The diameter of the small hole 24 is about 1 m.
m is desirable. If it is larger than about 1 mm, the frequency band to be attenuated changes, and if it is smaller than about 1 mm, the oil discharging effect is reduced. However, the diameter of the small hole 24 may be changed to positively change the attenuation frequency band.
Further, since the small hole 24 is opened on the upstream side of the closing valve 22, when the closing valve 22 closes the communication passage 21,
Since the suction chamber 17 and the suction port 20 do not communicate with each other through the small holes 24, the communication passage 21 can be securely closed.

[0028]

As described above, according to the present invention, since the muffler space is provided in the communication passage between the suction side or the discharge side and the corresponding port, the muffler space is generated on the suction side or the discharge side. Since pulsating waves can be attenuated, unpleasant noise in the vehicle interior can be prevented.

Also, since the muffler space is formed on the outer periphery of the tunnel defining the communication path of the rear head,
Since it can be formed integrally with the rear head, the cost does not increase. Also, in the case of being formed separately, it is only necessary to first form the space that becomes the communication passage and the muffler space in the rear head and then attach the pipe that defines the communication passage later, so that it can be easily formed. In addition, it is possible to suppress an increase in cost.

Further, since the small holes for draining the oil are formed in the muffler space, the damping characteristics of the muffler space can be stabilized, and the noise can be surely suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a compressor according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a communication passage and a muffler space.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Front head 3 Cylinder block 4 Rear head 5 Housing 6 Rotating shaft 7 Crank chamber 9 Cylinder 12 Piston 13 Rotating swash plate 16 Discharge chamber 17 Suction chamber 20 Suction port 21 Communication passage 22 Closing valve 23 Muffler space 24 Small hole 25 Tunnel Department

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yukio Kazahaya 39, Higashihara, Chiyo-ji, Odai-gun, Osato-gun, Saitama Pref. 39 Higashihara Co., Ltd. Inside Xexel Valeo Climate Control (72) Inventor Shoichi Enokido 39 Higashihara Higashihara, Konan-cho, Osato-gun, Saitama Prefecture F-term (reference) 3H003 AA03 AC03 BA03 CD02 3H076 AA06 BB02 CC20 CC39 CC83 CC94 CC95

Claims (9)

[Claims] A housing including a front head, a cylinder block, and a rear head; a compression mechanism driven by rotation of a drive shaft provided through the front head; and a suction port formed in the rear head and having a compression opening. A compressor including at least a suction chamber that opens, and a discharge chamber that is formed in the rear head and that opens to a discharge port of the compression mechanism, wherein one of the suction chamber and the discharge chamber is formed at a center side of the rear head. And the other of the suction chamber or the discharge chamber is formed on the outside thereof, and one of the suction chamber or the discharge chamber formed on the center side of the rear head and the suction chamber or the discharge formed on the outside of the rear head. A tunnel-shaped communication passage penetrating the other of the chambers and communicating with a corresponding port is formed, and a pie for mounting the communication passage and the port is provided. Compressor, characterized in that the formation of the muffler space between the connection portion. 2. The compressor according to claim 1, wherein the muffler space communicates with an outer end of the communication passage. 3. The compressor according to claim 1, wherein the tunnel defining the communication passage is formed integrally with the rear head. 4. The compressor according to claim 1, wherein the tunnel portion defining the communication passage is formed by inserting a pipe member separate from the rear head. 5. A small hole communicating with the communication path is formed at a rear end of the muffler space, and oil retained in the muffler space is returned to the communication path. 4. The compressor according to any one of 4. 6. The compression mechanism is formed in the cylinder block, and has a plurality of cylinders each having a suction port communicating with the suction chamber and a discharge port communicating with the discharge chamber. 9. The apparatus according to claim 6, wherein the piston is inserted, a rotating swash plate that rotates together with the drive shaft to reciprocate the piston, and a variable capacity mechanism that can change an angle of the rotating swash plate. The compressor according to any one of claims 1 to 5. 7. The compressor according to claim 1, wherein the communication passage is a suction passage. 8. The compressor according to claim 7, wherein a valve mechanism capable of opening and closing the suction passage by an external signal is provided in the suction passage. 9. The compressor according to claim 8, wherein the small hole opens on an upstream side of the valve mechanism.