CN1100947C - Check valve apparatus for scroll compressor - Google Patents

Abstract

A check valve device of a scroll compressor includes a cylindrical casing having an inner hole of a predetermined size and fixed on the upper part of a discharge port of a fixed volute, and a A piston type check valve that is guided by the outer circumference and moves up and down. The one-way valve device can prevent the reverse rotation of the compressor caused by rapidly closing the discharge port during the stop of the compressor.

Description

Check valve device for scroll compressor

The present invention relates to a scroll compressor, and more particularly to an improved check valve arrangement for a scroll compressor. In this device, a piston-type check valve is movably placed in a cylindrical housing so as to oscillate upward and downward in the housing without inclination, thereby preventing abnormal noise from being produced, and It also prevents the backflow of exhausted gas due to rapid closure of the discharge port.

General scroll compressors are used in air conditioners and refrigerators. As shown in Fig. 1, the general scroll compressor comprises a hermetically sealed container 1, a compressor part 2, a motor part 3 placed in the container 1 and a suction part formed by an outer peripheral wall part. Tube 4. The suction pipe 4 is connected to an external device (for example, an evaporator).

The compressor part 2 is provided with a fixed volute 5, a swirl volute engaged with the fixed volute 5, a crankshaft 7 driving the vortex 6 and a Shaft 7, and the upper frame 8 of the swirl volute 6 is placed thereon.

In addition, scroll-shaped surrounds 5a, 6a protrude from the fixed scroll 5 and the swirl scroll 6, respectively, so as to engage with each other. The surrounding elements 5a, 6a are formed with an involute curve or a curve similar to an involute.

An Oldam ring 9 is placed between the swirl volute 6 and the main frame 8 to prevent the swirl volute 6 from rotating. And an eccentric portion 7a of the crankshaft 7 having a bearing 10 is connected to the lower part of the swirl type volute 6 so that the swirl type volute 6 can perform vortex motion without rotation according to the rotation of the crankshaft 7 .

The gas in a pressure chamber is pressurized by the swirl volute 6 and the fixed volute 5, and the pressurized gas passes through a discharge port 11 and a discharge chamber 12, and then passes through an upper casing 13 The discharge pipe 14 on the side discharges to the outside of the airtight container 1 .

Meanwhile, the motor part 3 is provided with a stator 15 fixed on the inner wall of the airtight container 1 and a rotor 16 fixed on the crankshaft 7 .

A lower frame 19 supporting the lower end portion of the crankshaft 7 is placed on the lower part of the airtight container 1, and an oil pump 20 is placed on the lower part of the crankshaft 7, therefore, on the base of the airtight container 1 The oil 17 in the oil storage chamber 18 can be distributed to the corresponding part engaged with the crankshaft 7 .

Referring now to FIG. 2 and FIG. 3, the pressurization step of the scroll compressor constructed as above will be described in more detail.

FIG. 2 shows different refrigerant pressurization steps depending on the swirl angle of the swirl volute 6 . As shown in the figure, when the surrounding part 6a of the swirl type volute 6 forms a suction passage at a place away from an outer surrounding part 5a of the fixed scroll 5, the surrounding parts 5a of the two volutes , When the two crescent-shaped pressure chambers 21 formed in 6a move toward the center of the volute, the refrigerant flowing in through the suction channel is pressurized.

At the discharge port 11 made at the rear of the fixed volute 5, the finally centered pressure chamber 21 opens, and the pressurized refrigerant gas passes through the discharge port 11 and is pushed upwards to a position fixed in an upper Diaphragm 22 above the one-way valve 24 in the one-way valve housing 23 and then discharged into the discharge chamber 12 formed by the upper diaphragm 22 and the upper case 13 . Then, the refrigerant gas is sent through the discharge pipe 14 to an external device, for example, a condenser.

The highly pressurized refrigerant gas discharged from the discharge port 11 can float the one-way valve 24 that is not fixed in the one-way valve housing 23 . Thus, when the upper diaphragm discharge outlet 22a is opened, the substantially pressurized refrigerant gas can be discharged. During the refrigerant gas discharge process, the one-way valve 24 is lifted by the refrigerant gas discharged toward the rear of the one-way valve housing 23, so that the gas discharge can be made smooth.

When the compressor stops working, the refrigerant gas added to a very high pressure stops discharging, so that the one-way valve 24 raised to the back of the one-way valve housing 23 quickly closes the discharge outlet 22a of the upper diaphragm , Therefore, the greatly pressurized gas in the discharge chamber 12 flows back into the pressure chamber of the scroll compressor, thereby preventing the volute and the motor from rotating in reverse.

As shown in FIG. 3, the usual one-way valve 24 for preventing reverse rotation of the volute and the motor is made of a thin metal material plate and placed on the discharge outlet 22a of the upper diaphragm.

During the working process of the compressor with the usual one-way valve 24, when the discharge gas passes through the discharge pipe 14, a discharge gas pressure P _d is formed between the upper diaphragm 22 and the upper casing 13, and when the discharge gas passes through The discharge gas pressure P _p at the discharge port of the fixed volute 5 is higher than the gas pressure P _d in the discharge chamber 12 . As a result, the pressure at the bottom of the check valve 24 is higher than the pressure at the top, so the check valve 24 is lifted until it rests against the back of the check valve housing 23, as shown in Figure 4A .

However, if during the actual operation of the compressor, the suction pressure Ps decreases, that is, if the pressure ratio (discharge pressure/suction pressure) increases, the pressure _Pp at the initial discharge becomes lower than the discharge pressure _Pd . At this time, as shown by the arrow D in Figure 4B, the check valve 24 descends and separates from the back side of the check valve housing 23, and at the overshoot point, it rises as shown by the arrow U, thereby It will hit the inner wall and the side surface of the back of the check valve housing 23 .

During this sequential cycle, the one-way valve 24 oscillates upward and downward, and thus noise is generated due to the collision of the one-way valve 24 .

As mentioned above, the general one-way valve is made of thin plate, correspondingly, its axial side area is wider, so the pressure distribution is slightly uneven, and the one-way valve will oscillate. Also, it is difficult for the discharge gas leaving the discharge port to form a uniform pressure distribution on the front end surface of the check valve, and therefore, it is impossible to move upward and downward while maintaining a balanced state with the back of the check valve housing. oscillation. As a result, when the check valve moves, it tilts in the check valve housing, generating noise caused by the valve hitting the side wall of the check valve housing. This noise is worse when the suction pressure is low and the discharge pressure is high.

In addition, when the compressor is stopped, since the one-way valve moves slowly, it cannot block the discharge port, so that the noise caused by the reverse rotation of the compressor due to the reverse flow of the generated gas will be generated.

Furthermore, when several types of compressors with different capacities are studied for the needs of mass production, the action trends of the flat-plate check valves are different for the corresponding models. Therefore, depending on the type of compressor, another check valve should be installed, which reduces productivity.

The present invention aims to overcome this disadvantage of conventional one-way valve arrangements.

An object of the present invention is to provide a check valve device of a scroll compressor, which can prevent abnormal noise caused when the check valve hits an upper diaphragm and check valve housing, the above-mentioned Abnormal noise, if the ratio of suction pressure to discharge pressure exceeds a predetermined value during the operation of the compressor, it will cause abnormal movement due to uneven pressure distribution; During shutdown, the compressor reverses rotation due to rapid closure of the discharge port.

In order to achieve the above object, according to the present invention, a check valve device for a scroll compressor is provided, which includes a cylindrical housing and a piston-type check valve. The cylindrical casing has an inner hole of a predetermined size and is fixed to the upper end portion of the discharge port of the fixed volute. The piston check valve is guided along the inner or outer circumference of the housing and moves upward and downward.

Objects and advantages of the present invention will be more readily understood from the detailed description given below. It should be understood, however, that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are illustrative only and that various modifications can be made within the spirit and scope of the invention, as will be apparent to those skilled in the art from the detailed description. changes and improvements.

The invention will be better understood with reference to the accompanying drawings. Accompanying drawing is only for illustration, but not limitation to the present invention, wherein:

FIG. 1 is a schematic cross-sectional view of a common scroll compressor;

Figure 2 shows a schematic plan view using a fixed volute and a swirl volute to show the steps of gas compression;

Fig. 3 shows a partial cross-sectional view of a gas discharge portion of a conventional one-way valve;

Fig. 4 A represents the partial cross-sectional view of the working condition of this common one-way valve in the lifting process;

Figure 4B represents a partial cross-sectional view of the operation of the conventional one-way valve during abnormal movement;

5A is a plan view and a cross-sectional view of a housing of a one-way valve device according to a first embodiment of the present invention;

5B is a plan view and a cross-sectional view of a one-way valve of a one-way valve device according to the first embodiment of the present invention;

5C is a plan view and a cross-sectional view of a support of a one-way valve device according to the first embodiment of the present invention;

5D is a partial cross-sectional view of a one-way valve device according to the first embodiment of the present invention, wherein the one-way valve device is fixed on the fixed volute;

5E is a perspective view of a one-way valve device according to the first embodiment of the present invention, wherein the one-way valve device is fixed on the fixed volute;

6A is a plan view and a cross-sectional view showing a lower case of the case according to the first embodiment of the present invention;

6B is a plan view and a cross-sectional view showing an upper case of the case according to the first embodiment of the present invention;

7A is a plan view and a cross-sectional view showing a housing of the check valve device according to a second embodiment of the present invention;

7B is a plan view and a cross-sectional view showing a check valve of the check valve device according to a second embodiment of the present invention;

8A is a plan view and a cross-sectional view showing a housing of the check valve device according to a third embodiment of the present invention;

8B is a plan view and a cross-sectional view showing a check valve of the check valve device according to a third embodiment of the present invention;

9A is a plan view and a cross-sectional view showing a housing of the check valve device according to a fourth embodiment of the present invention;

9B is a plan view and a cross-sectional view showing a check valve of the check valve device according to a fourth embodiment of the present invention;

10A is a plan view and a cross-sectional view showing a housing of the check valve device according to a fifth embodiment of the present invention;

Fig. 10B is a plan view and a cross-sectional view showing a check valve of the check valve device according to a fifth embodiment of the present invention.

A check valve device of a scroll compressor according to a preferred embodiment of the present invention will now be described with reference to the accompanying drawings.

As shown in Figures 5A, 5B and 5C, the one-way valve device according to the first embodiment of the present invention includes a cylindrical housing 100, which can be used as a one-way valve housing in the conventional technology, Also includes a one-way valve 110 that can be inserted into the housing 100 and pushed by exhaust gas to move upward and downward in the housing 100; and a supporting member 120 supporting the housing Body 100, and when the one-way valve 110 is lifted, a refrigerant gas discharge passage can be provided.

The housing 100 includes a shoulder 101 projecting radially from its upper portion, which stops the upward movement of the one-way valve 110 . Through each side portion of the housing 100 , an engaging hole 102 is made for fixing the housing 100 to a fixed scroll 130 .

The support member 120 is made in the form of a ring whose height is lower than that of the one-way valve 110 .

As shown in FIGS. 5D and 5E , a support member 120 of the first embodiment of the present invention is formed on each upper side surface of the fixed scroll 130 and spaced from the discharge port 140 at a distance. The piston-type non-return valve 110 is inserted into the housing 100 so that it can oscillate in the housing. Utilize a fixture (not shown) to fix this casing 100 on this fixed volute 130, at this moment, the hole on the support 120 and the joint hole 102 in this casing 100 are stacked together, make corresponding The holes can be placed along a same vertical line.

In another embodiment of the present invention, the casing 100 and the supporting member 120 can be manufactured in one body and fixed in the fixed volute, so that the productivity can be improved.

As shown in FIGS. 6A and 6B, the case 100 can be divided into a lower case 100a and an upper case 100b. The lower housing 100a has a cylindrical hole in which the one-way valve 110 can oscillate upward and downward. The upper housing 100b is engaged with the upper surface of the lower housing 100a and has a small cylindrical hole for limiting the lifting action of the one-way valve 110 .

The operation of this first embodiment will now be described.

The refrigerant gas pressurized in the pressure chamber formed by the fixed scroll 130 and the surround (not shown) of the swirl scroll (not shown) begins to pass through the fixed scroll 130. The discharge port 140 is discharged, and at the same time the cylindrical check valve 110 is raised.

At this time, the one-way valve 110 rises along the inner circumferential surface of the cylindrical housing 100, and when the compressor continues to work, the one-way valve 110 is in a rising state while maintaining the connection with the housing 100. The surface of the shoulder block 101 is tightly attached.

Since the one-way valve 110 is maintained in a raised state during operation, the exhaust gas can be discharged through the gas passage at the same height as the support member 120 .

In addition, when the compressor is stopped, the discharge gas filling the discharge chamber (not shown) pressurizes the upper surface of the check valve 110 downwardly through the hole on the upper surface of the housing 100 . Therefore, the one-way valve 110 quickly closes the discharge port 140 to prevent the discharge gas from flowing backward.

The check valve device according to the second embodiment of the present invention will now be described with reference to FIGS. 7A and 7B.

The second embodiment is an upside-down version of the first embodiment, wherein a one-way valve 210 covers a cylindrical housing 200 . The casing 200 includes a plurality of discharge passages 201 formed by the peripheral portion, so that the exhaust gas can be discharged therefrom; in addition, a shoulder 202 protruding outward from the upper part of the casing 200 is used to stop the unit. In addition, it also includes an engaging hole 203 on each side portion of the housing for fixing the housing on the fixed volute 130 .

From the bottom of the one-way valve 210 , a protruding portion 211 protrudes inwards, which can be hooked by the shoulder 202 of the housing 200 .

Now, the operation of the second embodiment of the present invention will be described.

The refrigerant gas pressurized in the pressure chamber is discharged through the discharge port 140 formed in the fixed scroll 130 and causes the check valve 210 to rise. At this time, when the protruding portion 211 hooks the shoulder 202 of the housing 200, the upward movement of the one-way valve 210 is stopped.

At this time, the exhaust gas is discharged through the exhaust passage 201 of the case 200 .

When the compressor stops working, the discharge gas filling the discharge cavity (not shown) presses down the upper surface of the check valve 210, so the check valve 210 closes the discharge passage 202 of the housing 200 , thereby preventing backflow of exhaust gas.

Referring now to Figs. 8A and 8B, a check valve device according to a third embodiment of the present invention will be described.

The one-way valve device according to the third embodiment includes a cylindrical housing 300 and a one-way valve 310 movable up and down through a cylindrical hole on the housing 300 . On the lower end surface of the one-way valve 310, a protruding portion 311 having a diameter larger than that of the cylindrical hole in the housing 300 is formed so that the rise of the one-way valve 310 can be restricted.

At this time, the discharge gas is discharged through the discharge passage as high as the support member 120, as in the first embodiment.

Here, reference numeral 301 denotes an engaging hole for fixing the casing 300 to the fixed scroll 130 .

The operation of the third embodiment of the present invention is the same as that of the above-mentioned embodiment, and therefore, description thereof is omitted.

As shown in FIGS. 9A and 9B, a check valve device according to a fourth embodiment of the present invention includes a cylindrical housing 400, the top of which is sealed. The housing 400 includes a plurality of discharge passages 401 formed through its circumference. The one-way valve 410 for upward and downward movement in the housing 400 may be a piston type one-way valve as in the first embodiment.

Now, the operation of the fourth embodiment of the present invention will be described.

The refrigerant gas pressurized in the pressure chamber is discharged through the discharge port 140 formed in the fixed scroll 130 and raises the check valve 410 . The one-way valve 410 leans against the lower surface of the top of the casing 400 .

At this time, the exhaust gas is discharged through the exhaust passage 401 formed through the circumferential portion of the case 400 .

When the compressor stopped working, the discharge gas was no longer discharged, so that the one-way valve 410 lifted up by the discharge gas dropped by its own weight, thereby blocking the discharge port 140 of the fixed volute 130; at the same time, the discharge Passage 401 is also closed, thereby preventing backflow of exhaust gases.

As shown in Figures 10A and 10B, the one-way valve device according to the fifth embodiment of the present invention includes a cylindrical housing 500, and an upward and downward direction in a cylindrical hole of the housing 500. Movement check valve 510. The one-way valve 510 has an inclined portion 511 . A plurality of discharge passages 143 are formed through the inclined portion 511, and the one-way valve 510 is formed in the shape of a container.

A shoulder 501, as in the case of the housing 100 of the first embodiment, extends inwardly from the upper portion of the housing 500 to stop the upward movement of the one-way valve 510. On each side portion of the casing 500 , there is provided an engaging hole 502 for fixing the casing 500 with the fixed volute 130 .

The operation of this fifth embodiment will now be described.

The discharge gas discharged through the discharge port 140 of the fixed scroll 130 makes the check valve 510 ascend. At this time, when the one-way valve 510 hooks the shoulder 501 extending inwardly from the upper portion of the cylindrical housing 500, the upward movement of the one-way valve 510 stops.

At this time, the discharge gas is discharged through the discharge passage 511a formed on the inclined portion 511 of the check valve 510. Referring to FIG.

When the compressor stops working, the discharge gas that fills the discharge cavity (not shown) passes through the upper hole of the casing 500, and applies pressure downward to the upper surface of the check valve 510, so that the check valve 510 The discharge port 140 is quickly closed, thereby preventing the discharge gas from flowing backward.

As described above, the check valve device of the scroll compressor according to the present invention can operate by using various kinds of piston type check valves which move up and down in corresponding check valve housings. In particular, during the operation of the one-way valve, the one-way valve can be prevented from being tilted, and therefore, the backflow of exhaust gas can be prevented, thereby preventing the noise generated by the backflow of gas.

Since the present invention may have several forms of implementation without departing from the spirit of its main characteristics, it should be understood that the above-described embodiments are not limited to any details described above (unless otherwise indicated), but rather should be considered as examples in the All changes and improvements within the spirit and scope of the appended claims, or equivalents of such spirit and scope are intended to be embraced by the appended claims.

Claims (11)

1. the check valve apparatus of a scroll compressor, it comprises: a cylindrical housings, this cylindrical housings have an endoporus that pre-determines size, and are fixed on one fixedly on the top of a floss hole of volute; With

An one-way valve in the form of piston, it can lead along the inner circumference or the excircle of this housing, and does motion up and down.

2. device as claimed in claim 1 is characterized by, and on each lower portion of this housing, is provided with a bearing device, in order to obtain the discharge passage of a refrigerant gas.

3. device as claimed in claim 2 is characterized by, and this bearing device and this housing are integral.

4. device as claimed in claim 2 is characterized by, and this one-way valve of the aspect ratio of this bearing device is little.

5. device as claimed in claim 1 is characterized by, and this housing comprises:

A shoulder block that inwardly stretches from this housing top is done the vertical motion of the one-way valve that moves upward along this housing inner circumference in order to restriction; With

Work conjugate foramen on each side direction part of this housing is so that be fixed on this fixedly on the volute with this housing.

6. device as claimed in claim 5 is characterized by, and this one-way valve makes container shapes, and on its incline section many discharge passages is arranged.

7. device as claimed in claim 5 is characterized by, and this housing comprises:

A lower shell body, it has an endoporus that this one-way valve is moved up and down therein; With

A upper shell, it comprises a shoulder block that limits this one-way valve vertical motion.

8. device as claimed in claim 1 is characterized by, and forms a projection in the bottom of this one-way valve, does ascending motion in order to limit this one-way valve along the endoporus of this housing.

9. device as claimed in claim 1 is characterized by, and this cylindrical housings comprises:

A shoulder block that inwardly stretches out from the top of this housing, the ascending motion of the one-way valve that moves upward along the excircle of this housing with restriction; The discharge passage that forms on the circumference of side is in order to discharge refrigerant gas by this discharge passage; With

A conjugate foramen of making on each side direction part of this housing is in order to be fixed on this housing this fixedly on the volute.

10. device as claimed in claim 9 is characterized by, and the one-way valve of this container shapes inserts along the inner circumference of this housing, and this housing comprises a projection that inwardly stretches out, in order to the restriction shoulder block.

11. device as claimed in claim 1, it is characterized by, this columniform housing has the top of sealing, the many discharge passages that form on its sidewall, a conjugate foramen that forms on its each side direction part, this conjugate foramen is in order to be fixed on this housing this fixedly on the volute.

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