JP2000297760A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor which can obstruct the position shift of a delivery valve, reduce the dead volume at the compression time and prevent the danger of a valve break. SOLUTION: A valve seat plate 13 partitioned between a suction chamber and delivery chamber and bored a delivery hole 15 has a recessed valve seat surface 13a matched with the outer periphery shape of the delivery valve 19 on one surface faced by the delivery valve 19 and the delivery valve 19 is positioned to the valve seat surface 13a. As the other application example, the main body of the delivery valve is entered in the valve mounting hole of the delivery hole 15 and a retainer 21 is faced to the valve mounting hole part.

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 discharge valve, and more particularly to a scroll type or swash plate type compressor which discharges a compressed fluid to a discharge chamber through a discharge valve.

[0002]

2. Description of the Related Art As a conventional compressor, a scroll type compressor of a type in which a fixed member and a movable member are engaged with each other at an angle to give a relative circular motion to reduce the volume, and a rotary motion of a swash plate are used. A swash plate compressor of a type that converts fluid into reciprocating motion of a piston to compress a fluid is known.

Hereinafter, a scroll type compressor will be described as an example of the related art 1. FIG. 10 shows a schematic configuration of a conventional scroll compressor. Referring to FIG. 10, the compressor has a bottomed cylindrical casing 1 whose one end is open. At the open end of the casing 1,
A shaft support (front housing) 2 is provided.
The shaft support 2 is fixed to the casing 1 by a plurality of screws (not shown). In addition, a through hole is formed at the center of the shaft support 2. The drive shaft 3 is disposed in the through hole so as to penetrate the through hole. The drive shaft 3 is rotatably supported by the shaft support 2 via ball bearings 4 and 5. A drive device 6 is attached to the protruding end of the drive shaft 3.

A driving device 6 includes a pulley 7 rotatably supported at the protruding end of the shaft support 2, an electromagnetic clutch 8 for connecting or disconnecting the transmission of the rotational force of the pulley 7 to the driving shaft 3, It comprises a motor (not shown) for rotating the pulley 7 and a transmission device (not shown) for transmitting the driving force of this motor to the pulley 7.

[0005] In the space between the casing 1 and the shaft support 2, a fixed scroll member 9 disposed on the bottom side of the casing 1 and a fixed scroll member 9 facing the fixed scroll member 9 and located on the open side of the casing 1. The movable scroll member 10 is provided. Fixed scroll member 9
Is fixed to the casing 1 by inserting a plurality of screws 11 from outside the bottom of the casing 1 and tightening the screws.

The fixed scroll member 9 cooperates with the bottom of the casing 1 to form a first plate (valve seat plate) 13 and a first plate 13 formed on one surface of the first plate 13 forming the discharge chamber 12. The spiral body 14 is provided.

As shown in FIGS. 11 and 12, the first plate 13 is provided with a discharge hole 15 at the center thereof. The discharge hole 15 is connected to the first plate 1 through the discharge valve 19.
3 is opposed to the retainer 21. One end of the discharge valve 19 and the retainer 21 is fixed to the first plate 13 by a bolt 20.

The movable scroll member 10 includes the second plate 1
6 and a second spiral 17 formed on one surface of the second plate 16 and meshing with the first spiral 14. The movable scroll member 10 is eccentrically fixed with respect to the drive shaft 3, and is disposed inside the casing 1 so as to be capable of orbiting movement. Here, inside the casing 1, the space in which the movable scroll member 10 is disposed with respect to the discharge chamber 12 forms a suction chamber 23 that sucks a fluid (refrigerant) from the outside.

The first plate 13 is engaged with first and second steps 1a and 1b formed on the inner surface of the casing 1.

After the first plate 13 is brought into contact with the first and second steps 1a and 1b, the fixed scroll member 9 is inserted into four through holes 1c formed in the bottom of the casing 1 so as to be outside the casing 1. By inserting a plurality of bolts 11 from above, the fixed scroll member 9 is screwed by the screw 11 to mutually face seal.

In the upper wall of the casing 1, a suction hole (not shown) for sucking a gaseous refrigerant (heat medium) and a discharge hole (not shown) for discharging the refrigerant are formed. ing. The discharge hole communicates with the discharge chamber 12.

When the movable scroll member 10 is turned by the rotational force of the drive shaft 3, the refrigerant is sucked into the suction chamber 23 from the suction hole of the casing 1 and compressed between the movable scroll member 10 and the fixed scroll member 9 and is compressed. A discharge hole 15 in which the compressed refrigerant is formed in the central portion of the fixed scroll member 9
From the discharge chamber 12, and the high-pressure refrigerant in the discharge chamber 12 is discharged from the discharge hole of the casing 1.

Movable scroll member 10 on drive shaft 3
A counterweight 26 is attached via an eccentric bush 25 to a portion near the portion to which is attached.

FIG. 13 shows a variable displacement type swash plate type compressor as prior art 2. This compressor is described in JP-A-60-175783. In this swash plate compressor, the swash plate 1 disposed in the crank chamber 101a is used.
The swash plate 110 is rotated by the rotation of the drive shaft 4 to reciprocate the plurality of pistons 121 to compress the fluid.

A plurality of cylinder bores 102a formed in the cylinder block 102 are provided at one end with a suction hole 122 for sucking fluid and a discharge hole 123 for discharging fluid. Also, cylinder block 1
On valve 02, a valve seat plate 124 is provided via a gasket 125 so as to control the flow of fluid to the suction hole 122 and the discharge hole 123. The cylinder head 126 having the partition wall 126a is disposed on one end surface of the valve seat plate 124 via the gasket 129 so that the suction chamber 127 and the discharge chamber 128 are formed. The valve seat plate 124 and the cylinder head 126 are fixed on the cylinder block 102.

The discharge hole 123 faces a retainer 121 provided on a valve seat plate 124 via a discharge valve 119. One end of the discharge valve 119 and the retainer 121 are fixed to the valve seat plate 124 by bolts 220 and nuts 221.

In this compressor, when a torque is applied to the drive shaft 104, the torque is applied to the rotor 108 and the hinge 111.
With the rotation of the swash plate 110, the shoe 119 slides on the circumference of the swash plate 110.

The rotational force of the swash plate 110 is converted into a reciprocating motion of the piston 121. The fluid (refrigerant) sucked into the cylinder bore 102a from the suction hole 122 by the reciprocating motion of the piston 121 is compressed and then discharged to the discharge hole 123.
Through the discharge chamber 128.

[0019]

In the compressors of the prior arts 1 and 2, since the valve seating surfaces of the valve seat plates 13 and 124 are flat, the discharge valves 19 and 119 and the retainer 2 are not provided.
There is a problem in that, when the bolts 1 and 121 are fixed with the bolts 20 and 220, the discharge valves 19 and 119 or the retainers 21 and 121 are displaced.

That is, since the bolts 20 and 220 are screwed while being rotated on the first plate 13 or the valve seat plate 124, the discharge valves 19 and 119 or the retainers 21 and 121 are rotated in the rotation direction. Discharge holes 15, 12
3 may be misaligned.

Accordingly, when the discharge valves 19, 119 or the retainers 21, 121 are displaced with respect to the discharge holes 15, 123, the refrigerating capacity is reduced due to the displacement, excessive stress applied to the discharge valves, wear debris during operation, etc. In some cases, the discharge valve may be broken due to, for example, biting of foreign matter.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a compressor which can prevent displacement of a discharge valve or a retainer when the discharge valve and the retainer are fixed with bolts.

Another object of the present invention is to provide a compressor capable of improving the assemblability at the time of mounting and preventing a decrease in refrigeration capacity.

Still another object of the present invention is to provide a compressor capable of preventing a discharge valve from cracking.

[0025]

According to the present invention, there is provided a casing, a suction chamber for sucking refrigerant in the casing, and a discharge chamber for discharging and storing the refrigerant compressed in the suction chamber.
A valve seat plate partitioning the suction chamber and the discharge chamber and having a discharge hole formed therein, a discharge valve facing the discharge hole on one surface of the valve seat plate, and a discharge valve disposed on the one surface via the discharge valve. In a compressor including a retainer provided on the valve seat plate and a fixing member having one end of the discharge valve and the retainer fixed to the valve seat plate, the valve seat plate is provided on the one surface facing the discharge valve. Having a concave valve seating surface according to the outer peripheral shape of the discharge valve,
The compressor is characterized in that the discharge valve is located on the valve seating surface.

[0026]

According to the first embodiment of the present invention, when the discharge valve is assembled, a concave seat is formed so that the displacement of the discharge valve does not occur and the valve seating surface does not move. Apply boring. When fixing the discharge valve and the retainer to the valve seat plate, the discharge valve is opposed to the valve seating surface, and a retainer is provided on the discharge valve and fixed to the valve seat plate by a fixing member. At this time, since the discharge valve is located on the concave valve seating surface, it is possible to prevent the bolt from rotating in the rotational direction during assembly.

In the second embodiment, the volume of the discharge hole portion of the valve seating surface becomes the volume (dead volume) of the discharge hole that is compressed in the fluid discharging step, and the compressor is partially configured. Since the dead volume is desirably smaller because it will cause a decrease in the capacity of the refrigeration (cooling) circuit, in order to reduce the dead volume of the discharge hole as much as possible, the valve seating surface of the discharge valve must be dug down in advance to To reduce the dead volume.

Further, in the third embodiment, since the discharge valve is not a flat discharge valve as shown in the first and second embodiments, foreign matter may be caught between the discharge valve and the valve seating surface. This eliminates the risk of valve breakage like a flat discharge valve. Even if foreign matter enters the discharge hole, the compressed refrigerant flows out to the discharge chamber side when the compressed refrigerant is discharged from the discharge hole into the discharge chamber.

[0029]

Next, an embodiment of a compressor according to the present invention will be described in detail with reference to the drawings. Note that the compressor shown in the embodiment has almost the same configuration as the scroll type compressor shown in Prior Art 1, and therefore, except for the configuration of the components necessary for the description of the components of the present invention, Conventional technology 1
The description of the same parts as those in the above is omitted.

FIGS. 1A and 1B show a first embodiment of the compressor of the present invention. FIG.
1 (A) and FIG. 1 (B), the fixed scroll member 9 is a first plate (hereinafter referred to as a valve seat plate) which forms the discharge chamber 12 in cooperation with the bottom of the casing 1 shown in FIG. 1)
3 and a first spiral body 14 formed on one surface of the valve seat plate 13.

A discharge hole 15 is formed in the valve seat plate 13. The discharge hole 15 faces a retainer 21 provided on the valve seat plate 13 via a thin flat discharge valve 19. One end of the discharge valve 19 and the retainer 21 is fixed to the valve seat plate 13 by a bolt 20.

On the valve seat plate 13 facing the discharge valve 19, a concave valve seating surface 13a corresponding to the outer peripheral shape of the discharge valve 19 is formed. The discharge hole 15 is located within the range of the valve seating surface 13a. The valve seating surface 13 a is formed by performing a concave spot facing in advance in accordance with the shape of the discharge valve 19. The depth of the concave portion of the valve seating surface 13 a is substantially equal to or greater than the thickness of the discharge valve 19.

The discharge valve 19 and the retainer 21 are connected to the valve seat plate 13.
In order to fix the discharge valve 19 to the valve seating surface 13a, the retainer 21
And fixed to the valve seat plate 13 by bolts 20. At this time, since the discharge valve 19 is located on the valve seating surface 13a, it is possible to prevent the bolt 20 from rotating in the rotation direction due to rotation during assembly.

FIGS. 2A and 2B show a second embodiment of the compressor of the present invention. FIG.
2A and 2B, similarly to the first embodiment, a concave valve seating surface 13b corresponding to the outer peripheral shape of the discharge valve 19 is formed on the valve seat plate 13 facing the discharge valve 19. Have been.

Incidentally, the valve seating surface 13b is
Discharge hole 1 whose volume is compressed during the fluid discharge step
5 (dead volume), which causes a reduction in the performance of a refrigeration (cooling) circuit that partially constitutes the compressor.

In order to prevent such a decrease in the performance of the refrigeration circuit, the valve seat plate 13 further includes a valve seating surface 13b extending from the portion where the valve seating surface 13b is fixed by the bolts 20 to the valve seat plate 13 beyond the discharge hole 15. It is formed so that the thickness of the plate up to the vicinity of the center becomes gradually smaller. That is, the valve seating surface 13
b is an inclined surface inclined from the outside of the valve seat plate 13 toward the center.

Since it is desirable that the dead volume is smaller, the valve seating surface 13b of the discharge valve 19 is dug in advance in order to reduce the dead volume of the discharge hole 15 as much as possible. The opening amount of the discharge valve 19 is determined by the warpage of the retainer 21 (the opening amount of the discharge valve 19; the lift amount). Therefore, the opening amount (lift amount) required at the time of discharge is dug down into the valve seating surface 13b of the discharge valve 19. The lift amount L1 shown in FIG. 2A is substantially equal to the lift amount L2 shown in FIG.

FIGS. 3A, 3B and 4 show a third embodiment of the compressor according to the present invention. 3 (A), 3 (B) and 4, retainer 2
One end of 1 is fixed to the valve seat plate 13 by bolts 20. The discharge hole 15 of the valve seat plate 13 faces a retainer 21 provided along the valve seat plate 13.

As shown in FIG. 4, the discharge hole 15 has a valve mounting hole 15a having a large circular and tapered diameter on the retainer 21 side, and the valve mounting hole 15a is continued from the valve mounting hole 15a. And a hole 15b having a small diameter. That is, the valve mounting hole portion 15a of the discharge hole 15 is a through hole formed in a funnel shape as a whole. Valve mounting part 1
5a is provided with a discharge valve 29a formed in a conical shape so as to close the hole 15b.

As is apparent from FIG.
The main body of a enters the valve mounting hole 15a, and the conical tip portion enters the hole 15b. Since the retainer 21 faces the valve mounting hole 15a, FIG.
It does not fall to the discharge chamber 12 side indicated by 0.
Also, since the discharge chamber 12 is usually on the high pressure side, the discharge valve 2
9a closes the hole 15b of the discharge hole 15. The refrigerant compressed from the suction chamber 23 side with respect to the discharge chamber 12 is supplied to the discharge hole 1 formed in the central portion of the fixed scroll member 9.
5 to the discharge chamber 12, the discharge valve 29a
Moves to the retainer 21 side, so that the discharge hole 15 is opened.

By the way, the flat discharge valve 19 and the valve seating surfaces 13a, 1a as shown in the first and second embodiments.
Although it is supposed that foreign matter such as wear debris may be caught in the compressor 3b during operation of the compressor, the discharge valve 29a in the third embodiment is different from the discharge valve 29a in the first and second embodiments. Since the discharge valve 19 is not such a flat discharge valve 19, foreign matter does not bite, and the danger of valve breakage like the flat discharge valve 19 can be prevented. Also, in the event that foreign matter is
5, the compressed refrigerant flows through the discharge hole 15 through the discharge chamber 12.
When ejected, the foreign matter can flow out to the ejection chamber 12 side.

FIGS. 5 (A), 5 (B), 6 (A) and 6 (B) show a modified example of the discharge valve 29a shown in FIG. 4 and the discharge hole 15 corresponding to this discharge valve 29a. Is shown.
The discharge valve 29b shown in FIGS. 5A and 5B has a quadrangular pyramid shape. The discharge hole 15 has a large frusto-conical square and tapered valve mounting hole 15a on the retainer 21 side, and a square having a smaller diameter than the valve mounting hole 15a following the valve mounting hole 15a. And a hole 15b.

The discharge valve 29c shown in FIGS. 6A and 6B has a triangular pyramid shape. The discharge hole 15 is a retainer 21
A valve mounting hole portion 15a having a large triangular tapered diameter on the side, and a valve mounting portion 1 continued to the valve mounting portion 15a.
And a triangular hole 15b having a diameter smaller than 5a.

FIGS. 7 (A), 7 (B), 8 (A) and 8 (B), 9 (A) and 9 (B) show the discharge valve 29a shown in FIG. Another shape of a modified example of the discharge hole 15 corresponding to the discharge valve 29a is shown.

The discharge valve 29d shown in FIGS. 7A and 7B has a disk shape. The discharge hole 15 is provided in the retainer 21.
It has a valve mounting hole 15m having a large cylindrical diameter on its side, and a cylindrical hole 15n having a smaller diameter than the valve mounting portion 15m following the valve mounting portion 15m. The diameter of the discharge valve 29d is larger than the valve mounting hole 15m, and is larger than the hole 15n. The discharge valve 15 is provided in the valve mounting hole 15m.

The discharge valve 29e shown in FIGS. 8A and 8B has a square plate shape. The discharge hole 15 is provided in the retainer 2.
Valve mounting hole 15m with a large square cylindrical bore on one side
And a square hole 15n having a smaller diameter than the valve mounting portion 15m. The diameter of the discharge valve 29e is larger than the valve mounting hole 15m and larger than the hole 15b. The discharge valve 29e is provided in the valve mounting hole 15m.

The discharge valve 29f shown in FIGS. 9A and 9B has a triangular plate shape. The discharge hole 15 is provided in the retainer 2.
Valve mounting hole 15m with large triangular cylindrical bore on one side
And a triangular tube-shaped hole 15n having a smaller diameter than the valve mounting portion 15m. The diameter of the discharge valve 15 is larger than the valve mounting hole 15m, and is larger than the hole 15m. The discharge valve 29f is provided in the valve mounting hole 15m.

The closed and open states of the discharge valves 29d to 29f with respect to the discharge holes 15 shown in FIGS. 7A to 9B are the same as those in the first embodiment shown in FIGS. Since this embodiment is the same as the embodiment, the description is omitted. Also, the discharge hole 15 and the discharge valve 2 shown in FIGS.
9a to 29f are not limited to these shapes, and it goes without saying that various shapes can be designed by applying the configurations shown in FIGS. 3 (A) to 9 (B).

Further, the structure of the valve seat plate 13, the discharge hole 15, the discharge valve 19, and the retainer 21 described in the first to third embodiments is a variable capacity type as the prior art 2 shown in FIG. The same applies to a swash plate compressor.

[0050]

According to the first embodiment of the present invention,
When the discharge valve and the retainer are fixed to the valve seat plate with bolts on the valve seat plate, the discharge valve is located on the concave valve seating surface, so the position due to the movement in the rotation direction due to the rotation of the bolt at the time of assembly The displacement can be prevented.

According to the second embodiment, similarly to the first embodiment, it is possible to prevent the bolt from rotating in the rotation direction at the time of assembly, thereby reducing the dead volume of the discharge hole. Since the valve seating surface of the discharge valve is dug down in advance to reduce as much as possible, the dead volume at the time of compression can be reduced.

Further, according to the third embodiment, since the discharge valve enters the discharge hole, foreign matter does not bite into the discharge valve and the valve seating surface. The risk of valve cracking can also be prevented. Further, even if foreign matter enters the discharge hole, the compressed refrigerant can flow out to the discharge chamber side when the compressed refrigerant is discharged from the discharge hole into the discharge chamber.

[Brief description of the drawings]

FIG. 1A shows a first embodiment of a compressor according to the present invention, and is a cross-sectional view showing a configuration of a discharge valve.
(B) is a right side view of (A).

FIG. 2A is a cross-sectional view illustrating a configuration of a discharge valve according to a second embodiment of the compressor of the present invention,
(B) is a right side view of (A).

FIG. 3A is a cross-sectional view illustrating a configuration of a discharge valve according to a third embodiment of the compressor of the present invention.
(B) is a right side view of (A).

FIG. 4 is a perspective sectional view showing the configuration of the discharge valve shown in FIG.

FIGS. 5A and 5B are cross-sectional views showing a modification of the configuration of the discharge valve shown in FIG. 3A.

FIGS. 6A and 6B are cross-sectional views showing a modification of the configuration of the discharge valve shown in FIG. 3A.

FIGS. 7A and 7B are cross-sectional views showing a modification of the configuration of the discharge valve shown in FIG. 3A.

8 (A) and 8 (B) are cross-sectional views showing a modification of the configuration of the discharge valve shown in FIG. 3 (A).

FIGS. 9A and 9B are cross-sectional views showing a modification of the configuration of the discharge valve shown in FIG. 3A.

FIG. 10 is a longitudinal sectional view showing a schematic configuration of a compressor as a conventional technique 1.

FIG. 11 is a cross-sectional view for explaining the configuration of the discharge valve shown in FIG.

FIG. 12 is a right side view of FIG.

FIG. 13 is a longitudinal sectional view showing a schematic configuration of a compressor as a conventional technique 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Shaft support part 3 Drive shaft 6 Drive device 9 Fixed scroll member 10 Movable scroll member 11 Bolt 12 Discharge chamber 13 First plate (valve seat plate) 15 Discharge holes 15a, 15m Valve mounting holes 15b, 15n holes Part 19, 29a to 29f Discharge valve 21 Retainer

Claims (5)

[Claims] 1. A casing, a suction chamber for sucking a refrigerant into the casing, a discharge chamber for discharging and storing the refrigerant compressed in the suction chamber, a partition between the suction chamber and the discharge chamber, and a discharge hole. A valve seat plate having a hole formed therein, a discharge valve facing the discharge hole on one surface of the valve seat plate, a retainer provided on the valve seat plate via the discharge valve on the one surface, and A compressor including a fixing member having one end of a valve and a retainer fixed to the valve seat plate, wherein the valve seat plate has a concave valve seat conforming to an outer peripheral shape of the discharge valve on the one surface facing the discharge valve. A compressor having a surface, wherein the discharge valve is located on the valve seating surface. 2. The compressor according to claim 1, wherein a thickness of the valve seat is gradually reduced from a portion where the valve seat surface is fixed by the fixing member to a center side of the valve seat plate beyond the discharge hole. A compressor characterized by being formed so that it becomes. 3. A valve seat plate having a discharge hole formed therein, a discharge valve provided in the discharge hole, and a retainer provided on the valve seat plate on one surface of the valve seat plate so as to face the discharge hole. In a compressor including a fixing member in which one end of the retainer is fixed to the valve seat plate, the discharge hole is smaller than the valve mounting portion following the valve mounting hole formed on the retainer side and the valve mounting portion. And a hole having a space, and the discharge valve is provided in the valve mounting portion. 4. The compressor according to claim 3, wherein the valve mounting hole and the hole are holes formed in a funnel shape in cross section, and the valve mounting hole is opened and closed by the discharge valve. A compressor characterized by entering a hole. 5. The compressor according to claim 3, wherein the discharge valve has a plate shape, the valve mounting portion has a cylindrical shape larger than the hole, and the discharge valve has the hole. The compressor is inserted into the valve mounting hole so as to open and close the compressor.