JP2000249067A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of noise during operation and to prevent excessive compression of refrigerant gas resulting in the increase of a consumption power. SOLUTION: The mounting surface 1b of a reed valve 23 is situated in a position higher than that of a discharge hole seal surface 22a. This constitution facilitates opening of the reed valve 23 and prevents the occurrence of the sticking phenomenon of the reed valve 23 due to deviation of the working line of the elastic restoration force of the reed valve 23 from the tangential line direction of the discharge hole seal surface 22a, improves discharging ability of refrigerant gas through a discharge hole 22 to a high pressure chamber, and prevents direct collision of a reed valve surface 23a and the discharge hole seal surface with each other and reduces the generation of valve contact noise as a result of the reed valve surface 23a and a discharge hole seal surface 22a being brought into oblique contact with each other at an angle, provided by a difference (h) between the heights thereof, when the reed valve 23 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor mounted on a vehicle as a part of a car air conditioner system, and more particularly to overcompression of refrigerant gas which reduces noise during operation and increases power consumption. Is prevented.

[0002]

2. Description of the Related Art Conventionally, as a gas compressor of this type, for example, as shown in FIG. 8, a cylinder 1 having a substantially elliptical inner circumference is provided, and side blocks 2, 3 are attached to both end surfaces of the cylinder 1. The rotor 4 is housed inside the cylinder 1. The rotor 4 is rotatably provided via a rotor shaft 5 integrally formed therewith and bearings 6 and 7 supporting the front and rear ends of the rotor shaft 5. A plurality of vane grooves 8 are formed on the surface side (see FIG. 9), and a vane 9 is slidably mounted in the vane groove 8.

As shown in FIG. 9, the inner peripheral side of the cylinder 1 is divided into a plurality of small chambers by the inner wall of the cylinder 1, the inner surfaces of the side blocks 2, 3, the outer peripheral surface of the rotor 4, and the vane 9. The compression chamber 15 is called a compression chamber, and the rotation of the rotor 4 repeatedly changes the volume. When the volume of the compression chamber 15 changes, the refrigerant gas is sucked from the suction chamber 13 into the compression chamber 15 when the volume increases, and the refrigerant gas is compressed in the compression chamber 15 when the volume decreases. .

A position where the volume of the compression chamber 15 is near the minimum,
That is, in the vicinity of the minor axis of the ellipse of the cylinder 1, a discharge hole 22 that communicates between the compression chamber 15 and the high-pressure chamber (discharge chamber) 24 on the outer peripheral surface side of the cylinder 1 is provided.
A reed valve 23 is attached to the high-pressure-chamber-side opening end 22b to prevent the refrigerant gas from flowing backward from the high-pressure chamber 24 to the compression chamber 15. This reed valve 2
3 opens only when the refrigerant gas pressure in the compression chamber 15 becomes higher than the refrigerant gas pressure in the high pressure chamber 24, and otherwise closes to prevent backflow from the high pressure chamber 24 to the compression chamber 15 side. This prevents recompression of the refrigerant gas. When the reed valve 23 is closed as described above, the compression chamber 15 and the high-pressure chamber 2
The airtightness 4 is maintained by a surface (hereinafter, referred to as a “discharge hole sealing surface 22a”) around the discharge hole 22 that comes into contact with the reed valve 23. The opening of the reed valve 23 is limited to a predetermined opening by the valve support 27.

When the reed valve 23 is opened, the refrigerant gas in the compression chamber 15 passes through the discharge hole 22 and is discharged to the high pressure chamber 24, and the discharged refrigerant gas is further discharged to the discharge passage of the rear side block 3. After passing through 25, it is discharged to the discharge chamber 14 side through the oil separator 16 attached to the side block 3.

[0006]

However, FIG.
As shown in FIG. 1, according to the conventional gas compressor, the configuration in which the reed valve mounting surface 1b and the discharge hole sealing surface 22a are located on the same surface is adopted in order to secure airtightness when the reed valve 23 is closed. Was. Therefore, the reed valve 23
When the valve closes, the reed valve surface 23a and the discharge hole sealing surface 22a collide with each other, so that the valve collision noise is large and the noise during compressor operation is large.

When the airtightness of the reed valve 23 when it is closed is improved, the sticking phenomenon of the reed valve 23 due to the lubricating oil flowing in the refrigerant gas atmosphere becomes remarkable, and the reed valve 23 tends to be difficult to open. . When the reed valve 23 becomes difficult to open, the pressure in the compression chamber 15 immediately before the start of discharge increases instantaneously immediately before the reed valve 23 opens, and overcompression of the refrigerant gas occurs. Overcompression of the refrigerant gas
Increase in power consumption, increase in refrigerant gas discharge temperature, and
Poor follow-up of the vane 9 with respect to the inner surface of the cylinder 1, particularly when the follow-up of the vane 9 occurs, a collision sound between the vane 8 and the bottom of the vane groove 8, and a re-contact sound between the vane 8 and the inner wall of the cylinder 1. This also causes noise during compressor operation.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to reduce the noise during compressor operation as much as possible and to reduce the over-compression of the refrigerant gas which causes an increase in power consumption. It is another object of the present invention to provide a gas compressor suitable for preventing the above problem.

[0009]

In order to achieve the above object, according to the present invention, the pressure of a refrigerant gas compressed in a compression chamber causes the pressure of a discharge hole communicating with the compression chamber and the high pressure chamber to increase. In the gas compressor in which the reed valve is opened and the refrigerant gas is discharged from the compression chamber to the high-pressure chamber through the discharge hole, the mounting surface of the reed valve is connected to the discharge hole around the discharge hole when the reed valve is closed. It is characterized in that it is provided at a position higher than the sealing surface.

In the present invention, since the reed valve mounting surface is provided at a position higher than the discharge hole sealing surface, the reed valve surface and the discharge hole sealing surface obliquely contact at an angle given by the height difference. . Therefore, direct collision between the surfaces of the reed valve surface and the discharge hole sealing surface is avoided.
Also, the speed at which the reed valve contacts the discharge hole sealing surface is reduced. From such a point, the contact noise between the reed valve and the discharge hole sealing surface is reduced. Also, due to the relationship between the height of the reed valve mounting surface and the height difference between the discharge hole sealing surface, the action line of the resilient force of the reed valve deviates from the normal direction of the discharge hole sealing surface. It is easy to prevent the sticking phenomenon of the reed valve,
The discharge property of the refrigerant gas from the discharge hole to the high-pressure chamber is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas compressor according to the present invention will be described below in detail with reference to FIGS.
The basic configuration of the gas compressor of the present embodiment is shown in FIG.
This is the same as the conventional example shown in FIG. 9, and a detailed description thereof will be omitted.

Also in the gas compressor of the present embodiment, the pressure of the refrigerant gas compressed in the compression chamber 15 causes the compression chamber 15 and the high pressure chamber 24 to be described with reference to FIGS.
And the reed valve 23 of the discharge hole 22 communicating with is opened,
At this time, the high pressure chamber 24
In this embodiment, unlike the related art, the reed valve mounting surface 1b attached to the discharge hole 22 has the discharge hole sealing surface 22a as shown in FIG.
It is provided at a higher position.

There are various possible means for providing the reed valve mounting surface 1b at a position higher than the discharge hole sealing surface 22a. However, the reed valve mounting surface 1b and the discharge hole sealing surface 22a in this embodiment are the same as in the prior art. In the present embodiment, the cylinder 1 is provided in the notch 1a on the outer periphery of the cylinder 1 constituting the inner wall of the cylinder 24 (see FIG. 9).
At the time of processing, a step is provided between the reed valve mounting surface 1b and the discharge hole sealing surface 22a so that the reed valve mounting surface 1b is positioned higher than the discharge hole sealing surface 22a. Therefore, the reed valve 23 and the discharge hole sealing surface 2
A gap G having a size corresponding to the height difference h between the reed valve mounting surface 1b and the discharge hole sealing surface 22a is formed between the reed valve mounting surface 1b and the discharge valve sealing surface 22a.

As means for providing the reed valve mounting surface 1b at a position higher than the discharge hole sealing surface 22a, the thin plate 26 may be placed on the reed valve mounting surface 1b as shown in FIG. Alternatively, the position of the reed valve mounting surface 1b may be higher than the discharge hole sealing surface 22a by the thickness of the thin plate 26.

When the compression of the refrigerant gas in the compression chamber 15 reaches the last stage, the pressure of the compressed and high-pressure refrigerant gas pushes up the reed valve 23 to open. At this time, the elastic recovery force of the reed valve 23 with respect to the normal direction of the discharge hole sealing surface 22a from the relationship between the height difference h between the reed valve mounting surface 1b and the discharge hole sealing surface 22a as described above. The reed valve 23 is easily opened, the sticking phenomenon of the reed valve 23 is prevented, and the refrigerant gas can be discharged from the discharge hole 22 to the high-pressure chamber 24 better than before.

In the gas compressor of the present embodiment, since the reed valve 23 is easy to open as described above, the pressure in the compression chamber 15 immediately before the start of discharge is instantaneously increased immediately before the reed valve 23 opens, as in the prior art. , And the refrigerant gas does not overcompress, thereby increasing the power consumption due to overcompression, increasing the discharge temperature of the refrigerant gas, and causing the vane 9 to follow the inner surface of the cylinder 1 poorly. 9
The collision noise between the vane 8 and the bottom of the vane groove 8 and the re-contact noise between the vane 8 and the inner wall of the cylinder 1 which can occur when the following failure occurs can be prevented.

On the other hand, when the reed valve 23 is closed,
The reed valve surface 23a and the discharge hole sealing surface 22a make an oblique contact at an angle given by the height difference h.
Therefore, the reed valve surface 23a and the discharge hole sealing surface 22
a can be avoided, and the contact noise between the reed valve 23 and the discharge hole sealing surface 22a is reduced and reduced.

Further, the closed reed valve 23
Since the pressure of the refrigerant gas discharged from the high-pressure chamber 24 acts on the discharge hole sealing surface 22a, the refrigerant gas is deflected and pressed against the discharge hole sealing surface 22a. Therefore, the airtightness of the reed valve 23 when it is closed is not impaired.

FIG. 3A shows the change over time of the lift position (lift amount) of the reed valve 23 in this embodiment, and FIG. 3B shows the speed of the reed valve 23 at the lift position. Things. Here, the symbol “+ A” in the figure indicates the highest floating point when the reed valve 23 is opened, and the symbol “−B” indicates the return point due to the elastic recovery force when the reed valve 23 is closed.

As can be seen from these figures, in the present embodiment, the speed V of the reed valve 23 depends on the fact that the reed valve 23 is floating above the discharge hole sealing surface 22a by the gap G as described above. Is the speed 0mm / sec
Departure from the highest point (+ A) and return point (-
As it moves toward B), the speed gradually increases, and eventually the maximum speed V
After reaching max, a speed reduction occurs. Since the reed valve 23 contacts the discharge hole sealing surface 22a at a speed V1 lower than the maximum speed Vmax, the contact noise between the reed valve 23 and the discharge hole sealing surface 22a is reduced and reduced at this point.

FIG. 4A shows the relationship between the power difference and the height difference h between the reed valve mounting surface 1b and the discharge hole sealing surface 22a in the present invention, and FIG. 4B shows the height difference h and noise. According to these relationship diagrams, when the height difference h is 0.1 to 0.5 mm, the noise reduction effect is large and the power increase is small. It turns out that it is a range. Further, even if the height difference h is 0.1 mm or less, the effect of reducing power and noise appears as long as it is not 0 mm as in the related art.

FIGS. 5 to 7 show the related art of the present invention. The technique of FIG. 5 utilizes the fact that the reed valve 23 is installed obliquely upward with respect to the discharge hole sealing surface 22a by making the reed valve mounting surface 1b an inclined surface. It is configured to be lifted from the sealing surface 22a.
In the technique shown in FIG. 6, the reed valve 23 is formed so as to be warped at a constant curvature R so that the tip of the reed valve 23 rises from the discharge hole sealing surface 22a. In addition, the technology of FIG.
By providing 3d, this is also a reed valve 23
Are configured so that the front end side of them is raised from the discharge hole sealing surface 22a. In any of these techniques, there is no difference in height between the reed valve surface 23a and the discharge hole sealing surface 22a. However, since the reed valve 23 is lifted, a gap G corresponding to the difference in height is formed. The same effect as the above embodiment can be obtained.

[0023]

As described above, in the gas compressor according to the present invention, the reed valve mounting surface is provided at a position higher than the discharge hole sealing surface. For this reason, the reed valve surface and the discharge hole sealing surface obliquely contact each other at an angle given by the difference in height, thereby avoiding a direct collision between the reed valve surface and the discharge hole sealing surface. Since the speed at which the valve contacts the discharge hole sealing surface is reduced, the contact noise between the reed valve and the discharge hole sealing surface is reduced, and the noise of the entire gas compressor can be reduced.

Further, in the present invention, the action line of the resilient force of the reed valve with respect to the normal direction of the discharge hole sealing surface is determined from the relationship between the height of the reed valve mounting surface and the height difference between the discharge hole sealing surface. Due to the misalignment, the reed valve is easier to open than before, the sticking phenomenon of the reed valve is prevented, and the discharge property of the refrigerant gas from the discharge hole to the high-pressure chamber is improved. For this reason, it is possible to prevent the pressure in the compression chamber immediately before the start of discharge from instantaneously increasing immediately before the reed valve is opened and to prevent the refrigerant gas from being over-compressed as in the related art, and to reduce the consumption due to the over-compression. It is possible to prevent an increase in power, an increase in the discharge temperature of the refrigerant gas, and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a main part of the present invention.

FIG. 2 is a sectional view showing another embodiment of a main part of the present invention.

3A is an explanatory diagram showing a change over time of a lift position (lift amount) of the reed valve according to the present invention, and FIG. 3B is an explanatory diagram showing a speed of the reed valve at the lift position.

FIG. 4 (a) is an explanatory view of a relationship between a difference in height between a reed valve mounting surface and a discharge hole sealing surface and power in the present invention,
(B) is an explanatory view of the relationship between the height difference and noise.

FIG. 5 is an explanatory diagram of a related technique of the present invention.

FIG. 6 is an explanatory diagram of a related technique of the present invention.

FIG. 7 is an explanatory diagram of a related art of the present invention.

FIG. 8 is a cross-sectional view of a conventional gas compressor.

FIG. 9 is a sectional view taken along line AA of FIG. 8;

FIG. 10 is an explanatory diagram of a reed valve in a conventional gas compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 1a Notch 1b Reed valve mounting surface 2, 3 Side block 4 Rotor 5 Rotor shaft 6, 7 Bearing 8 Vane groove 9 Vane 13 Suction chamber 15 Compression chamber 16 Oil separator 23 Reed valve 23a Reed valve face 24 High pressure chamber Reference Signs List 22 discharge hole 22a discharge hole sealing surface 22b high-pressure chamber side open end 25 discharge passage 26 thin plate 27 valve support

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[Procedure amendment]

[Submission date] February 17, 2000 (2000.2.1
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

When the airtightness of the reed valve 23 when it is closed is improved, the sticking phenomenon of the reed valve 23 due to the lubricating oil flowing in the refrigerant gas atmosphere becomes remarkable, and the reed valve 23 tends to be difficult to open. . When the reed valve 23 becomes difficult to open, the pressure in the compression chamber 15 immediately before the start of discharge increases instantaneously immediately before the reed valve 23 opens, and overcompression of the refrigerant gas occurs. Overcompression of the refrigerant gas
Increase in power consumption, increase in refrigerant gas discharge temperature, and
Poor follow-up of the vane 9 with respect to the inner surface of the cylinder 1. In particular, when poor follow-up of the vane 9 occurs, a collision sound between the vane 9 and the bottom of the vane groove 8, and a re-contact sound between the vane 9 and the inner wall of the cylinder 1. This also causes noise during compressor operation.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

In the gas compressor of the present embodiment, since the reed valve 23 is easy to open as described above, the pressure in the compression chamber 15 immediately before the start of discharge is instantaneously increased immediately before the reed valve 23 opens, as in the prior art. , And the refrigerant gas does not overcompress, thereby increasing the power consumption due to overcompression, increasing the discharge temperature of the refrigerant gas, and causing the vane 9 to follow the inner surface of the cylinder 1 poorly. 9
, The collision sound between the vane 9 and the bottom of the vane groove 8 and the re-contact sound between the vane 9 and the inner wall of the cylinder 1 can be prevented.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tohru Takahashi 4-3-1, Yashiki, Narashino-shi, Chiba F-term (reference) in Seiko Seiki Co., Ltd. 3H003 AA01 AB07 AC03 CC11 CC12 3H029 AA05 AA17 AB03 BB21 BB42 CC15 3H040 AA09 BB12 CC09 CC10 DD28

Claims (1)

[Claims] The pressure of the refrigerant compressed in the compression chamber opens a reed valve of a discharge port communicating with the compression chamber and the high-pressure chamber. At this time, refrigerant gas flows from the compression chamber to the high-pressure chamber through the discharge hole. In the gas compressor to be discharged, a mounting surface of the reed valve is provided at a position higher than a discharge hole sealing surface around a discharge hole which the reed valve contacts when the reed valve is closed.