JP2006046116A - Electromagnetic control valve with relief valve and compressor with this electromagnetic control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic control valve with a relief valve capable of being easily attached to a compressor and providing the relief valve without requiring an exclusive section and to provide the compressor with this electromagnetic control valve. <P>SOLUTION: This electromagnetic control valve 21 has a high pressure part 26, a middle pressure part 27, a low pressure part 28, a plunger 29 inserted into an insertion hole 23 in which openings 24, 25 are formed at both ends, respectively, to adjust each opening of a supply passage from the high pressure part 26 to the middle pressure part 27 and a return passage from the middle pressure part 27 to the low pressure part 28 and a solenoid 30 for controlling and driving the plunger 29 in accordance with an electric signal. The relief valve 22 for adjusting pressure is provided in the high pressure part 26. Consequently, installation of the relief valve 22 as a single unit is unnecessary, and it is unnecessary to support the electromagnetic control valve 21 firmly by suppressing pressure of refrigerant gas applied to the electromagnetic control valve 21 by the relief valve 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic control valve with a relief valve provided in a vehicle air conditioner and the like, and a compressor (compressor) provided with the electromagnetic control valve.

  Conventionally, as shown in FIG. 4 to FIG. 6, the pressure regulating relief valve 1 and the electromagnetic control valve 2 are provided separately as required by law and discharged by discharging the refrigerant out of the circuit when the pressure in the refrigerant circuit rises abnormally. A compressor 3 for a vehicle air conditioner is used. Although not shown, the compressor 3 is joined to a housing 4 in which a crank chamber is formed, and a rear end side (right side in FIG. 4) of the housing 4 to form a suction chamber and a discharge chamber. A rear housing 5 and a pulley 6 that is rotatably provided in the housing 4 and transmits power to an internal drive shaft are provided. In the compressor 3, the piston is reciprocated in the axial direction of the drive shaft in the housing 4 as the drive shaft rotates, whereby the refrigerant gas is sucked from the suction chamber and the high-pressure refrigerant gas is discharged to the discharge chamber. And supplied to an external refrigerant circuit (not shown). An insertion hole 7 into which the relief valve 1 is inserted and an insertion hole 9 in FIGS. 5 and 6 into which the plunger 8 of the electromagnetic control valve 2 is inserted are formed separately at the rear part of the rear housing 5. One end 9a of the insertion hole 9 is an open end, and the other end 9b is closed.

  As shown in FIG. 5, the electromagnetic control valve 2 includes the above-described plunger 8 and a solenoid 10 that is mounted on one end 9 a side of the insertion hole 9 and controls the plunger 8 in accordance with an electric signal. Are formed with a high pressure portion 11, an intermediate pressure portion 12, and a low pressure portion 13 that communicate with the discharge chamber, the crank chamber, and the suction chamber of the compressor 3, respectively. In the electromagnetic control valve 2, the plunger 8 moves in the axial direction by driving the solenoid 10, thereby supplying the supply path from the high pressure portion 11 to the intermediate pressure portion 12 and from the intermediate pressure portion 12 to the low pressure portion 13. The piston stroke of the compressor 3 is changed by adjusting the opening degree of the return passage to increase or decrease the pressure in the crank chamber. As a result, the discharge amount of the compressor 3 is increased or decreased.

  In such a conventional compressor 3, since the relief valve 1 and the electromagnetic control valve 2 are separately inserted into the insertion holes 7 and 9, respectively, in addition to the portion to which the electromagnetic control valve 2 is attached, the relief valve 1 1 is necessary, and a high-pressure refrigerant gas is applied to the electromagnetic control valve 2, so that the electromagnetic control valve 2 needs to be fixed with a plurality of bolts 14.

Patent Document 1 describes “a positive displacement compressor” including a control valve with a relief valve. In this conventional compressor, since the relief valve is provided integrally with the control valve, a dedicated portion to which the relief valve is attached can be omitted.
Japanese Patent Laid-Open No. 62-168982 (FIG. 2)

  However, the compressor described in Patent Document 1 has a relief valve integrated with a control valve and is used as a hydraulic pump for vehicle power steering, and discharges power steering oil when the vehicle is at high speed. Although the amount can be limited, a compressor provided in a vehicle air conditioner or the like that includes an electromagnetic control valve that increases or decreases the pressure of refrigerant gas in the crank chamber has not been considered.

  The present invention has been made in consideration of the above-described prior art, and an object of the present invention is to easily install an air conditioner to a compressor and to provide a relief valve without requiring a dedicated part. It is an object of the present invention to provide an electromagnetic control valve with a relief valve and a compressor equipped with the electromagnetic control valve.

  In order to achieve the above object, an invention according to claim 1 is directed to a high pressure section, a medium pressure section, and a low pressure section that communicate with a discharge chamber, a crank chamber, and a suction chamber, respectively, and supply from the high pressure section to the intermediate pressure section. A plunger that adjusts the degree of opening of each of the passage and the return passage from the intermediate pressure portion to the low pressure portion; and a solenoid that drives the plunger, and the plunger is moved in the axial direction by driving the solenoid. The electromagnetic control valve is configured to change the piston stroke of the compressor by adjusting each opening degree of the supply passage and the return passage to increase / decrease the pressure in the crank chamber. For example, the invention according to claim 2 is the invention according to claim 1, wherein the relief valve is connected to the high-pressure portion. A communication passage for communicating the-safe channel, the pressure in the communicating passage is configured to include a closing means for opening the communication passage when it exceeds a predetermined value.

  In order to achieve the above object, the invention according to claim 3 is configured to include the electromagnetic control valve with a relief valve according to claim 1 or claim 2.

  In the invention according to claims 1 to 3 configured as described above, the relief valve for adjusting the pressure is provided in the high pressure portion of the electromagnetic control valve, so that it is not necessary to provide a dedicated part for the relief valve. .

  In the present invention, an electromagnetic control valve for controlling the pressure of the refrigerant gas in the crank chamber can be easily attached to the compressor of the air conditioner, and a relief valve can be provided without requiring a dedicated part.

  Therefore, it is possible to improve the work efficiency when attaching the electromagnetic control valve to the compressor of the air conditioner, and to provide an electromagnetic control valve with a relief valve that can make the compressor compact, and a compressor equipped with this electromagnetic control valve. There is.

  Hereinafter, the details of an electromagnetic control valve with a relief valve and a compressor provided with the electromagnetic control valve according to an embodiment of the present invention will be described with reference to the drawings.

  One embodiment of the present invention is shown in FIGS. FIG. 1 is a front view of a compressor provided with an electromagnetic control valve with a relief valve according to an embodiment of the present invention, FIG. 2 is a diagram showing a cross section of the compressor along the line AA in FIG. 1, and FIG. It is sectional drawing which shows the insertion hole in which the electromagnetic control valve with a relief valve of this is inserted. 1 to 3, the same components as those shown in FIGS. 4 to 6 described above are denoted by the same reference numerals.

  As shown in FIGS. 1 to 3, the compressor 20 of this embodiment is provided with a relief valve 22 for pressure adjustment in the electromagnetic control valve 21 itself, as compared with the conventional compressor 3 shown in FIGS. 4 to 6. The insertion hole 23 into which the valve 21 is inserted is different from that of the conventional compressor 1 except that the insertion holes 23 are linear through holes formed with openings 24 and 25 at both ends, respectively. .

  The electromagnetic control valve 21 includes a high pressure part 26, an intermediate pressure part 27, a low pressure part 28, a supply passage from the high pressure part 26 to the intermediate pressure part 27, and a medium passage. It has a plunger 29 that adjusts each opening degree of the return path from the pressure part 27 to the low pressure part 28 and a solenoid 30 that controls and drives the plunger 29 in accordance with an electrical signal. The relief valve 22 includes a communication path that allows the high-pressure portion 26 and the relief opening 31 to communicate with each other, and an opening / closing means that opens the communication path when the pressure in the communication path exceeds a predetermined value.

  In this embodiment, the plunger 29 with the relief valve 22 is inserted into the insertion hole 23 from the opening 24 at one end during assembly, and the solenoid 30 is attached to the opening 24 side of one end, and one bolt 14 is used. Fasten to the rear housing 5. In this state, the opening 24 at one end is covered with the solenoid 30, and the opening 25 at the other end is blocked from any of the high pressure part 26, the intermediate pressure part 27, and the low pressure part 28. After the electromagnetic control valve 21 is assembled to the compressor 20 in this way, the plunger 29 is moved in the axial direction by driving the solenoid 30 when the compressor 20 is operated to adjust the opening degree of the supply passage and the return passage, thereby adjusting the crank chamber. The piston stroke of the compressor 20 is changed by increasing or decreasing the pressure. Next, when the pressure of the refrigerant gas in the high pressure section 26 exceeds a predetermined value, the compressor is operated by opening the communication path by the opening / closing means of the relief valve 22 and flowing the refrigerant gas in the high pressure section 26 to the relief opening 31. And the pressure in the high-pressure part 26 decreases. Accordingly, the pressure in the compressor discharge chamber and the external refrigerant circuit communicating with the high pressure section is reduced.

  In the present embodiment configured as described above, the relief valve 22 for pressure adjustment is provided in the high pressure portion 26 of the electromagnetic control valve 21, so that a dedicated portion for the relief valve 22 is not required.

  The present invention provides an electromagnetic control valve with a relief valve that can improve the working efficiency when an electromagnetic control valve for adjusting the pressure of refrigerant gas in a crank chamber is attached to a compressor of an air conditioner, and can reduce the size of the compressor. Since there is an effect that it is possible to provide a compressor provided with a control valve, it can be applied as a general vehicle air conditioner, and can also be widely applied as a general machine or industrial machine air conditioner.

It is a front view of the compressor provided with the electromagnetic control valve with a relief valve concerning one embodiment of the present invention. It is a figure which shows the cross section of the compressor which follows the AA line of FIG. It is sectional drawing which shows the insertion hole in which the electromagnetic control valve with a relief valve of this embodiment is inserted. It is a front view of the compressor provided with the conventional relief valve and the electromagnetic control valve separately. It is a figure which shows the cross section of the compressor which follows the BB line of FIG. It is sectional drawing which shows the insertion hole in which the conventional electromagnetic control valve is inserted.

Explanation of symbols

4 Housing 5 Rear Housing 14 Bolt 20 Compressor 21 Electromagnetic Control Valve 22 Relief Valve 23 Insertion Hole (Through Hole)
23, 25 Opening 26 High pressure part 27 Medium pressure part 28 Low pressure part 29 Plunger 30 Solenoid

Claims (5)

  The high pressure part (26), the intermediate pressure part (27) and the low pressure part (28) communicating with the discharge chamber, the crank chamber and the suction chamber of the compressor (20), respectively, and the intermediate pressure part (27) from the high pressure part (26). ) And a plunger (29) for adjusting the opening degree of the return passage from the intermediate pressure portion (27) to the low pressure portion (28), and the plunger (29) is controlled in accordance with an electric signal. A solenoid (30) to be driven, and by driving the solenoid (30), the plunger (29) is moved in the axial direction to adjust the opening degree of the supply passage and the return passage, thereby adjusting the pressure in the crank chamber. The electromagnetic control valve (21) is configured to change the piston stroke of the compressor (20) by increasing or decreasing the pressure, and the pressure adjusting relief valve (22) is provided to the high pressure portion (26). Characterized in that the provided relief valve (22) with electromagnetic control valve (21).   2. The solenoid valve with a relief valve according to claim 1, wherein the relief valve (22) communicates with the high pressure section (26) and the relief flow path, and the pressure in the communication path has a predetermined value. An electromagnetic control valve (21) with a relief valve (22), comprising: an opening / closing means for opening the communication passage when exceeding.   A compressor (20) comprising the electromagnetic control valve (21) with a relief valve (22) according to claim 1 or 2.   4. The compressor according to claim 3, wherein openings (24, 25) are formed at both ends, respectively, and an insertion hole (23) into which the plunger (29) is inserted is inserted into the insertion hole (23). The opening (24) at one end is covered with the solenoid (30) in a state where the plunger (29) is inserted from the opening (24), and the opening (25) at the other end of the insertion hole (23) is The compressor (20) characterized by being cut off from any of the high-pressure part (26), the intermediate-pressure part (27), and the low-pressure part (28).   The compressor (20) according to claim 4, wherein the insertion hole (23) comprises a straight through hole from one end to the other end.

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