JP2001227480A - Scroll type fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll fluid machinery having a high pressure (back pressure) room sealed by using an inexpensive seal member excellent in durability and reliability. SOLUTION: In this back pressure type scroll fluid machinery, an enclosed space is formed by interlocking a fixed scroll 3 with a pivoting scroll, a back pressure is applied by introducing the discharge pressure of a fluid compressed in the enclosed space to a high pressure room HR formed on the back surface side of the fixed scroll 3, and the fixed scroll 3 is pressed onto the pivoting scroll side. The high pressure room HR is sealed by a ring-shaped sealing member 20 of an elastic body having an almost U-shaped cross section. The seal member 20 is equipped with a space part 21 having a cross section shape widened by receiving a pressure and a through hole 22 to introduce a high pressure to the space part 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine such as a back pressure type, and more particularly to a seal structure for a high pressure (back pressure) chamber in a scroll type fluid machine.

[0002]

2. Description of the Related Art Conventionally, a scroll-type fluid machine such as a scroll-type compressor has a scroll-type compression mechanism provided with a fixed scroll, an orbiting scroll, and a rotation preventing mechanism. In this scroll-type compression mechanism, one fixed scroll is an immovable scroll supported in a housing connecting the suction pipe and the discharge pipe. The other orbiting scroll is arranged in a state meshed with the fixed scroll in the up and down or left and right direction,
The rotation of the fixed scroll is revolved with respect to the fixed scroll while being prevented from rotating by the rotation preventing mechanism and connected to a drive source such as an electric motor. This orbiting scroll,
By forming a crescent-shaped compression chamber in contact with the fixed scroll at a plurality of contact points and moving inward while reducing the volume from the outer peripheral side, suction, compression, and discharge can be performed simultaneously. .

In a scroll type fluid machine provided with such a scroll mechanism, a closed scroll having a spiral wrap standing on the inner surface of each end plate and an orbiting scroll are meshed with each other to form a closed space. There is a back-pressure scroll-type fluid machine in which a part of the fluid pressure compressed in the closed space is introduced to the back side of one scroll to press the one scroll against the other scroll side. . FIG. 7 shows the structure of a conventional back-pressure scroll type fluid machine. In the drawing, reference numeral 1 denotes a housing, 2 denotes a discharge cover for separating the inside of the housing 1 into a high-pressure chamber HR and a low-pressure chamber LR, and 3 denotes a fixed member. Scroll, 4 is orbiting scroll, 5 is frame, 6 is suction pipe,
Reference numeral 7 denotes a discharge pipe, 8 denotes a motor, 9 denotes a rotating shaft, and 10 denotes a rotation preventing mechanism. In such a back-pressure scroll fluid machine, the fixed scroll 3 is not completely fixed to the frame 5 by bolts or the like, and is movable within a restricted range.

In this case, the orbiting scroll 4 includes a motor 4
By the action of the eccentric pin 9a provided at the upper end of the rotating shaft 9 driven by the rotary shaft 9 and the rotation preventing mechanism 10 and the rotation preventing mechanism 10, the fixed scroll 3 performs the revolving orbiting motion. On the other hand, the fixed scroll 3 is supported by a frame 5 fixed to the housing 1 so as to be able to float via a support spring 11, and a discharge port 12 for compressed fluid is provided in the center of the back surface of the end plate 3a. I have. Further, a cylindrical flange 13 protruding from the back surface of the end plate 3a is provided around the discharge port 12, and the cylindrical flange 13 is fitted to a cylindrical flange 14 on the discharge cover 2 side. Since it is necessary to separate the high-pressure chamber HR and the low-pressure chamber LR at a portion where these cylindrical flanges 13 and 14 are fitted and apply a high pressure (back pressure) to the back of the fixed scroll 3 to push it down, the sealing member is used. 15 is adopted. The high-pressure chamber HR in this case also functions as a back-pressure chamber for applying a high-pressure discharge pressure to the back of the fixed scroll 3.

FIG. 8, which is an enlarged view of a portion D in FIG. 7, shows a seal structure in the above-described back-pressure scroll fluid machine, in which a high-pressure (back-pressure) chamber HR in which high pressure acts and a low-pressure chamber in which low pressure acts. A ring-shaped sealing member 15 having a U-shaped cross section is provided between the LR and the LR. In addition,
Reference numeral 13a in the figure denotes a step portion provided on the cylindrical flange 13 for attaching the seal member 15 to the outer peripheral portion. The seal member 15 includes an outer peripheral member 15a formed by molding a relatively soft resin, and a substantially U-shaped metal spring 15b disposed inside the outer peripheral member 15a. In this case, the metal spring 15b urges the U-shaped seal member 15 in a direction in which the seal member 15 expands. Therefore, at the time of starting with a small differential pressure, the sealing property can be secured by the urging force of the metal spring 15b. Then, when the pressure of the compressed fluid discharged from the discharge port 12 increases and the differential pressure with the low pressure chamber LR side increases,
Part of the pressure is introduced into the high pressure chamber HR, and the metal spring 15
Since it acts in the direction of expanding the U-shaped seal member 15 together with b, the sealing performance of the seal member 15 can be increased.

[0006]

In the above-mentioned conventional back-pressure scroll type fluid machine, the seal member 15 for sealing the high-pressure chamber HR is provided with a metal spring 15b for the purpose of ensuring the sealing property at the time of starting. As a result, the following problems arise. That is, the fixed scroll 3
However, when the orbital movement of the orbiting scroll 4 causes the amount of displacement in the direction of narrowing or widening the U-shape of the seal member 15 (indicated by the arrow 16 in FIG. 8) to increase, the metal fatigue due to long-term operation will increase. And the metal spring may be broken. It is desired to improve the problem of breakage of the metal spring in order to further improve the durability and reliability of the back-pressure scroll fluid machine. Although there is a stopper provided to regulate the amount of displacement of the U-shape, there is a problem that interference noise with the stopper is generated during operation, which is disadvantageous in reducing operation noise. . Further, the above-described conventional seal member 15 has a two-part configuration of a resin and a metal spring, and thus is disadvantageous in terms of cost.

The present invention has been made in view of the above circumstances, and is a back-pressure scroll-type fluid machine in which a back-pressure chamber is sealed using a sealing member which is inexpensive and has excellent durability and reliability. The purpose is to provide. Another object of the present invention is to provide a scroll-type fluid machine in which a high-pressure chamber is sealed using a similar sealing member.

[0008]

The present invention employs the following means in order to solve the above-mentioned problems. In the scroll type fluid machine according to the first aspect, the fixed scroll and the orbiting scroll each having a spiral wrap standing on the inner surface of each end plate are meshed with each other to form a closed space, and the closed space is formed in the closed space. A back-pressure scroll-type fluid in which a back pressure is applied by introducing a discharge pressure of the fluid compressed by a back pressure chamber formed on the back side of one scroll and the one scroll is pressed against the other scroll side. In the machine, the back pressure chamber is sealed with a ring-shaped seal member made of an elastic body and having a substantially U-shaped cross section. And a high-pressure introduction passage for introducing pressure.

According to such a scroll type fluid machine, the seal can be sealed by the elasticity of the seal member at the beginning of the operation, and the discharge pressure introduced from the back pressure chamber into the space as the compression pressure increases. And the pressure difference between the outside of the back pressure chamber and the outside of the back pressure chamber increases, so that the sealing member can be widened and the sealing force pressed against the sealing surface can be increased. In this case, it is preferable that, in the assembled state, the mating surface of the U-shaped upper part is almost in close contact with the assembling state, and the space portion and the back pressure chamber communicate with each other by the high-pressure introduction passage. Thereby, even when there is no differential pressure, a reliable sealing property can be obtained at the time of small startup. In particular, it is preferable that the high-pressure introduction passage is provided with through holes communicating from the upper surface of the seal member to the space at an appropriate pitch, thereby increasing the area of the mating surface. The sealing property at the time of starting can be enhanced without hindering the introduction.

According to the fourth aspect of the present invention, the closed scroll is formed by interlocking the fixed scroll and the orbiting scroll each having the spiral wrap standing on the inner surface of each end plate. A back pressure is applied by introducing the discharge pressure of the fluid compressed in the closed space into a back pressure chamber formed on the back side of one scroll, and the back scroll is pressed against the other scroll side. In a pressure-type scroll fluid machine, the back pressure chamber is sealed with a ring-shaped seal member made of an elastic body and having a substantially hollow circular cross section, and the seal member receives a pressure and widens in a cross-sectional shape with a space portion. A high-pressure introduction passage for introducing the discharge pressure into the space.

According to such a scroll type fluid machine, the seal can be sealed by the elasticity of the seal member at the beginning of the operation, and the discharge pressure introduced from the back pressure chamber into the space as the compression pressure increases. And the pressure difference between the outside of the back pressure chamber and the outside of the back pressure chamber increases, so that the sealing member can be widened and the sealing force pressed against the sealing surface can be increased. In this case, it is preferable that the seal member is such that the space inside the hollow circular shape is almost in close contact with the sealing member, and that the space and the back pressure chamber communicate with each other by the high-pressure introduction passage. Even when there is no differential pressure, a reliable sealing property can be obtained at the time of small startup. In particular, it is preferable that the high-pressure introduction passage is provided with through holes communicating from the upper surface of the sealing member to the space at an appropriate pitch, thereby providing a seal at the time of starting without preventing high-pressure introduction into the space. Can be enhanced.

According to a seventh aspect of the present invention, in the scroll type fluid machine, a fixed scroll having a spiral wrap standing on the inner surface of each end plate and an orbiting scroll are meshed with each other to form a closed space. The discharge pressure of the fluid compressed in the closed space was introduced into the back pressure chamber formed on the back side of one scroll, and the intermediate pressure between the discharge pressure and the suction pressure was formed on the back side of the one scroll. In a back-pressure type scroll-type fluid machine in which a back pressure is applied by being introduced into an intermediate back pressure chamber and the one scroll is pressed against the other scroll side, between the back pressure chamber and the intermediate back pressure chamber Is sealed by a ring-shaped seal member made of an elastic body and having a substantially U-shaped cross section, and the seal member guides the discharge pressure to the space having a cross-sectional shape which expands under pressure and the space. And it is characterized in that formed by and a high pressure introduction passage for.

According to such a scroll type fluid machine, the seal can be sealed by the elasticity of the seal member at the beginning of the operation, and the discharge pressure introduced into the space from the back pressure chamber as the compression pressure increases. A pressure difference is generated between the pressure and the intermediate pressure introduced into the intermediate back pressure chamber, so that the sealing member is widened and the sealing force pressed against the sealing surface can be increased. In this case, it is preferable that, in the assembled state, the mating surface of the U-shaped upper part is almost in close contact with the assembling state, and the space portion and the back pressure chamber communicate with each other by the high-pressure introduction passage. Thereby, even when there is no differential pressure, a reliable sealing property can be obtained at the time of small startup. In particular, it is preferable that the high-pressure introducing passage is provided with through holes communicating from the upper surface of the seal member to the space at an appropriate pitch, thereby increasing the area of the mating surface. The sealing property at the time of starting can be enhanced without hindering the introduction.

According to a tenth aspect of the present invention, in the scroll type fluid machine, a fixed scroll having a spiral wrap standing on the inner surface of each end plate and an orbiting scroll are meshed with each other to form a closed space. The discharge pressure of the fluid compressed in the closed space was introduced into the back pressure chamber formed on the back side of one scroll, and the intermediate pressure between the discharge pressure and the suction pressure was formed on the back side of the one scroll. A back pressure type scroll-type fluid machine in which a back pressure is applied by being introduced into an intermediate back pressure chamber to press the one scroll against the other scroll side, wherein the back pressure chamber is formed of an elastic body and has a substantially hollow circular cross section. And a high-pressure introducing passage for introducing the discharge pressure into the space having a cross-sectional shape which is widened by receiving pressure. Those characterized by comprising comprises a.

According to such a scroll type fluid machine, the seal can be sealed by the elasticity of the seal member at the beginning of the operation, and the discharge pressure introduced into the space from the back pressure chamber as the compression pressure increases. And the pressure difference between the outside of the back pressure chamber and the outside of the back pressure chamber increases, so that the sealing member can be widened and the sealing force pressed against the sealing surface can be increased. In this case, it is preferable that the seal member is such that the space inside the hollow circular shape is almost in close contact with the sealing member, and that the space and the back pressure chamber communicate with each other by the high-pressure introduction passage. Even when there is no differential pressure, a reliable sealing property can be obtained at the time of small startup. In particular, it is preferable that the high-pressure introduction passage is provided with through holes communicating from the upper surface of the sealing member to the space at an appropriate pitch, thereby providing a seal at the time of starting without preventing high-pressure introduction into the space. Can be enhanced.

According to a thirteenth aspect of the present invention, in the scroll type fluid machine, a fixed scroll having a spiral wrap standing on the inner surface of each end plate and an orbiting scroll are meshed with each other to form a closed space. In a scroll-type fluid machine for introducing a discharge pressure of a fluid compressed in a closed space to a discharge port communicating with a high-pressure chamber, the high-pressure chamber is sealed with a ring-shaped seal member made of an elastic body and having a substantially U-shaped cross section. The seal member includes a space having a cross-sectional shape that is widened by receiving pressure, and a high-pressure introduction passage that introduces the discharge pressure into the space.

According to such a scroll type fluid machine, the seal can be sealed by the elasticity of the seal member at the beginning of the operation, and the discharge pressure introduced from the high pressure chamber into the space as the compression pressure increases. Since the pressure difference between the outside of the high-pressure chamber and the outside of the high-pressure chamber increases, the sealing member can be widened and the sealing force pressed against the sealing surface can be increased. In this case, it is preferable that the sealing member be such that the mating surface of the U-shaped upper portion is almost in close contact with the assembling state, and that the space and the high-pressure chamber communicate with each other by the high-pressure introduction passage. Even when there is no differential pressure, a reliable sealing property can be obtained at the time of small startup. In particular, it is preferable that the high-pressure introducing passage is provided with through holes communicating from the upper surface of the seal member to the space at an appropriate pitch, thereby increasing the area of the mating surface. The sealing property at the time of starting can be enhanced without hindering the introduction.

In the scroll type fluid machine according to the present invention, a fixed scroll having a spiral wrap standing on the inner surface of each end plate and an orbiting scroll are engaged with each other to form a closed space. In a scroll-type fluid machine for introducing a discharge pressure of a fluid compressed in a closed space to a discharge port communicating with a high-pressure chamber, the high-pressure chamber is sealed with a ring-shaped seal member made of an elastic body and having a substantially hollow circular cross section. The seal member includes a space having a cross-sectional shape which is widened by receiving pressure, and a high-pressure introduction passage for introducing discharge pressure into the space.

According to such a scroll type fluid machine, the seal can be sealed by the elasticity of the seal member at the beginning of the operation, and the discharge pressure introduced from the high pressure chamber into the space as the compression pressure increases. Since the pressure difference between the outside of the high-pressure chamber and the outside of the high-pressure chamber increases, the sealing member can be widened and the sealing force pressed against the sealing surface can be increased. In this case, it is preferable that, in the assembled state, the space inside the hollow circular shape is almost in close contact with the assembling state, and that the space and the high-pressure chamber communicate with each other by the high-pressure introduction passage. Even when there is no differential pressure, a reliable sealing property can be obtained at the time of small startup. In particular, it is preferable that the high-pressure introduction passage is provided with through holes communicating from the upper surface of the sealing member to the space at an appropriate pitch, thereby providing a seal at the time of starting without preventing high-pressure introduction into the space. Can be enhanced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a scroll type fluid machine according to the present invention will be described below with reference to the drawings. In the first embodiment of the back-pressure scroll fluid machine, FIG. 1 showing the first embodiment corresponds to FIG. 8 of the prior art, in which reference numeral 2 denotes a discharge cover, and 3 denotes a fixed portion. Scroll, 13 and 14 are cylindrical flanges,
13a is a step. In this case, the orbiting scroll performs a revolving orbiting motion to compress the fluid, and the discharge pressure of the high-pressure fluid is introduced into the high-pressure (back pressure) chamber HR, and is provided above the outer peripheral surface of the cylindrical flange 13. Step 13a
A large differential pressure is generated between the high-pressure chamber HR and the low-pressure chamber LR, which are sealed by the seal member 20 attached to the pressure chamber HR.

The seal member 20 is a ring-shaped member formed of an elastic resin or the like, and has a substantially U-shaped cross section. A space 21 is provided below the U-shaped cross-section, and a through-hole 22 is provided as a high-pressure introduction passage for introducing the high-pressure discharge pressure by connecting the space 21 with the high-pressure chamber HR. Have been. This through hole 22
Is a U separated in the width direction so as to open in a natural state described later.
One end is opened on the upper surface of the letter shape, and the upper surface of the seal member 20 in which the through hole 22 is opened is attached to the high pressure (back pressure) chamber HR side. As a result, a high-pressure fluid is introduced into the space portion 21 through the through-hole 22, and a pressure acts so as to widen from the high-pressure chamber HR to the low-pressure chamber LR.

FIG. 2 shows a free state of the seal member 20, that is, a natural state before the seal member 20 is installed on the step 13a. In this state, the upper surface of the U-shaped cross section is separated by elasticity to form the groove 23. Further, flange portions 24 serving as sealing surfaces are formed on both upper side surfaces of the U-shaped cross section, and the distance W between the sealing surfaces in the natural state is a step difference in an assembled state before operation, that is, in a state where no differential pressure acts. In the state of being assembled to the portion 13a, the upper and lower mating surfaces (facing surfaces) forming the grooves 23 are set so as to be in close contact or almost in close contact. In other words, the seal member 20 assembled between the vertical surfaces of the cylindrical flanges 13 and 14 without receiving the differential pressure tries to open the groove 23 by its own elasticity, so that the high pressure chamber HR side and the low pressure chamber LR It can be sealed between the sides. If the groove 23 is completely adhered, the sealing performance can be improved. However, since there is no room for elastic deformation during the assembling work and the workability is reduced, an appropriate balance between the sealability and the workability is obtained. It is preferable to consider

The material of the seal member 20 is preferably a material having both elasticity and abrasion resistance, such as an elastic resin coated with a wear-resistant coating. The cross-sectional shape of the space 21 is preferably such that the width is increased by receiving a differential pressure. In particular, the cross-section is preferably widened in the direction in which the sealing surface of the flange 24 is pressed against the vertical surfaces of the cylindrical flanges 13 and 14. is there. In the illustrated example, the flange 24 can be effectively brought into close contact with the vertical surface by applying a differential pressure to the inclined surface 21 a provided above the space 21. The purpose of providing the through-holes 22 is that even if the groove 23 comes into close contact with the
In order to be able to introduce a high-pressure fluid pressure, it is only necessary to provide at least one location. However, it is preferable to provide a plurality of portions at an appropriate pitch in consideration of the fact that foreign matter is clogged or the pressure balance.

The operation of the back-pressure scroll type fluid machine provided with the above-described seal member 20 will be described below. In the initial state before the startup in which the orbiting motion of the orbiting scroll is stopped, the sealing surface of the flange portion 24 is brought into close contact with the elasticity of the sealing member 20, and the high-pressure chamber HR and the low-pressure chamber LR.
Between the seals. At this time, since the groove 23 is in close contact or almost in close contact, displacement in the direction of the arrow 16 is unlikely to occur. This is because the through holes 2 provided at an appropriate pitch
By adopting No. 2, that is, by a configuration in which the high-pressure introduction passage is not lost even when the groove 23 is in close contact, there is also an advantage that the seal member 20 does not require much elasticity.

When the revolving orbiting motion of the orbiting scroll is started from this initial state, there is no or small pressure difference at the start of the operation, so that a seal member 2 is provided between the high pressure chamber HR and the low pressure chamber LR.
Seal only with the elasticity of 0. When the pressure in the high-pressure chamber HR rises, the fixed scroll 3 receives a high back pressure and is pressed against the orbiting scroll, and in the seal member 20, a high-pressure fluid flows from the through hole 22 into the space 21. Will be introduced. Therefore, the space 2
1 is widened by the differential pressure, and in addition to the adhesion by elasticity, a force acts on the sealing surface of the flange portion 24 toward the vertical surface of the cylindrical flanges 13 and 14. Therefore, even if a large pressure difference is generated between the low pressure chamber LR and the high pressure chamber HR, mainly the flange 2
The sealing surface of No. 4 can be tightly adhered and sealed,
In addition, since there is no component corresponding to the conventional metal spring, not only the cost can be reduced, but also the durability and the reliability against displacement in the direction of the arrow 16 are improved. As a result, there is no need to provide a stopper for displacement regulation which has conventionally caused noise, which is advantageous in reducing the noise of the back-pressure scroll compression machine.

Next, a second embodiment of the seal member 20 will be described with reference to FIG. FIG. 3 shows a free state of the seal member 20. In the second embodiment, a continuous groove 23A is used as a high-pressure introduction passage so as not to be in close contact even in an assembled state. In this case, in order to ensure that the grooves 23A do not adhere to each other even when there is no differential pressure at the start of operation and that sufficient sealing performance can be secured, the continuous grooves 23A are required.
It is preferable to increase the width of the seal member or to use a material having great elasticity for the seal member 20 itself. The groove 23A may not have a constant width, but may be provided with appropriate irregularities, for example, so that a high-pressure introduction passage can be secured even when a large force acting in the contact direction is received. With such a configuration, it is possible to obtain the seal member 20 that is particularly excellent in workability at the time of assembly.

As a third embodiment, the seal member 20A shown in a free state in FIG. 4 has a ring shape formed of an elastic resin or the like, similarly to the first and second embodiments. Yes, it is formed into a substantially hollow circular cross section. In this hollow circular cross section, there is provided a space portion 21A having a substantially circular cross-sectional shape which expands under pressure, and further connects the space portion 21A and the high pressure chamber HR to introduce a high discharge pressure. A through hole 22 is provided as a high pressure introduction passage. The through holes 22 are provided at at least one position, preferably at a plurality of positions, for the same reason as in the first embodiment. In the illustrated example, a groove 23 that passes through the through-hole 22 from the outer peripheral surface to the space 21A and divides the wall surface of the seal member 20A is provided.

When the sealing member 21A is assembled, the space inside the hollow circular shape, that is, the space portion 21A substantially adheres, and the through hole 22 is also opened to form the space portion 21A.
High pressure can be introduced inside. Therefore, the seal member 20A is attached such that the surface where the through hole 22 is opened faces the high pressure (back pressure) chamber HR. As a result, a high-pressure fluid is introduced into the space 21A from the through-hole 22 and a pressure acts so as to widen from the high-pressure chamber HR to the low-pressure chamber LR. Can be.

In the above configuration, the high-pressure chamber HR is used as the back pressure chamber. However, in the second embodiment shown in FIG. 5, in addition to the high-pressure fluid pressure (discharge pressure) introduced into the high-pressure chamber HR, An example of application to a back-pressure scroll fluid machine having an intermediate back-pressure chamber 17 for guiding and pressing an intermediate pressure between the discharge pressure and the suction pressure is shown. In this case, the fluid pressure during compression is guided to the intermediate back pressure chamber 17 by the pressure guiding hole 18 provided in the end plate 3 a of the fixed scroll 3. The intermediate pressure guided to the intermediate back pressure chamber 17, that is, the intermediate back pressure is lower than the discharge pressure (back pressure) introduced into the high pressure chamber HR, and together with the high pressure discharge pressure introduced into the high pressure chamber HR, the fixed scroll 3 Acts as a force that pushes the back downward. Even in such a back-pressure scroll fluid machine, in order to seal a differential pressure generated between the high-pressure side high-pressure chamber HR and the low-pressure side intermediate back-pressure chamber 17, the above-described first to third embodiments are described. Seal members 20, 20 as illustrated
A is provided. Further, the above-described seal member 20,
20A can also be used as a seal member 20B for sealing a differential pressure generated between the intermediate back pressure chamber 17 and the low pressure chamber LR. In this case, the seal member 20B is installed upside down so that the through hole 22 is opened on the side of the intermediate back pressure chamber 17 having a higher pressure than the low pressure chamber LR.

Finally, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the seal members 20 and 20A shown in the first to third embodiments described above.
Is a scroll-type fluid machine provided with a lip seal 30 on the wrap end surface of the fixed scroll 3 and the orbiting scroll 4, that is, a scroll-type fluid machine different from a back-pressure type that uses a back pressure to shut off the high-pressure side and the low-pressure side. It shows an example applied to the above. In such a scroll type fluid machine, the discharge pressure of the fluid compressed in the closed space of the scroll compression mechanism also acts around the discharge port 12 communicating with the high pressure chamber HR. The fixed scroll 3 is a frame 31
And the high-pressure chamber HR and the low-pressure chamber LR are separated by a discharge cover 32. At the joint between the fixed scroll 3 and the discharge cover 32,
Since it is necessary to seal the pressure difference between the high-pressure chamber HR and the low-pressure chamber LR, the seal members 20 and 20A described above are used here.
You are using In a conventional scroll-type fluid machine that does not use a back pressure, the high-pressure chamber HR and the low-pressure chamber L
An O-ring or the like has been generally used as a seal member to isolate R from R.

In this case as well, the high-pressure discharge pressure discharged from the discharge port 12 communicating with the high-pressure chamber HR and acting on the sealing members 20 and 20A widens the space portions 21 and 21A and closely adheres to the wall surface. It is possible to prevent the high-pressure fluid that has been compressed from leaking to the low-pressure chamber LR side that exists below 32.

[0032]

According to the scroll fluid machine of the present invention,
A ring-shaped seal member made of an elastic member and having a substantially U-shaped cross section or a substantially circular hollow cross section for sealing a portion where a differential pressure is generated for applying a back pressure or a portion where a differential pressure is generated between a high pressure side and a low pressure side. Use And since this seal member was provided with the space part of the cross-sectional shape which expands under pressure, and the structure provided with the high voltage | pressure introduction path which introduce | transduces the said high pressure | pressure into this space part, not only good sealing performance is obtained. In addition, durability and reliability against displacement in a direction in which the width of the seal member is changed can be improved. As a result, a stopper for restricting the displacement of the seal member in the width direction is not required, so that the source of the interference noise is eliminated and the effect of reducing the noise is achieved. In addition, since the structure is constituted by a single member, it is effective in reducing costs.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a main part of a first embodiment of a back-pressure scroll fluid machine according to the present invention.

FIGS. 2A and 2B are views showing a first embodiment of the seal member shown in FIG. 1, wherein FIG. 2A is a plan view showing a part thereof, and FIG. 2B is a sectional view taken along line AA of FIG.

3A and 3B are views showing a second embodiment of the seal member shown in FIG. 1, wherein FIG. 3A is a plan view showing a part thereof, and FIG. 3B is a sectional view taken along line BB of FIG.

4A and 4B are views showing a third embodiment of the seal member shown in FIG. 1, wherein FIG. 4A is a plan view showing a part thereof, and FIG. 4B is a sectional view taken along line CC of FIG.

FIG. 5 is a sectional view of a main part showing a second embodiment applied to a back pressure type scroll fluid machine in which the seal member shown in FIGS. 2 to 4 has an intermediate back pressure chamber for introducing an intermediate pressure. is there.

FIG. 6 is a sectional view of a main part showing a third embodiment in which the seal member shown in FIGS. 2 to 4 is applied to a scroll type fluid machine having a tip seal.

FIG. 7 is a cross-sectional view showing a configuration of a back-pressure scroll fluid machine as a conventional example.

8 is an enlarged sectional view of a main part showing a seal structure of a D part in FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 housing 2 discharge cover 3 fixed scroll 3a end plate 4 orbiting scroll 6 suction pipe 7 discharge pipe 12 discharge port 13,14 cylindrical flange 13a step 17 intermediate back pressure chamber 18 introduction hole 20, 20A, 20B sealing member 21, 21A space Part 21a Inclined surface 22 Through-hole (high-pressure introduction passage) 23 Groove 23A Groove (high-pressure introduction passage) 24 Flange 30 Chip seal 31 Frame 32 Discharge cover HR High-pressure chamber (back pressure chamber) LR Low-pressure chamber

Continued on the front page (72) Inventor Hiroaki Bito 3-1-1 Asahicho, Nishibiwashima-cho, Nishi-Kasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air Conditioning Works F-term (reference) 3H039 AA03 AA04 AA12 BB02 BB15 CC03 CC08 CC26 CC31 CC33 CC35

Claims (18)

[Claims] A closed scroll is formed by interlocking a fixed scroll and an orbiting scroll, each having a spiral wrap standing on the inner surface of each end plate, to form a closed space, and the discharge pressure of the fluid compressed in the closed space. Is introduced into a back pressure chamber formed on the back side of one scroll to apply back pressure, and the one scroll is pressed against the other scroll side. Is sealed by a ring-shaped seal member made of an elastic body and having a substantially U-shaped cross section, and the seal member receives a pressure and widens in a cross-sectional shape, and a high-pressure introduction passage for introducing the discharge pressure into the space. And a scroll-type fluid machine comprising: 2. The sealing member according to claim 1, wherein a mating surface of a U-shaped upper portion is substantially in close contact with the sealing member in an assembled state, and the space and the back pressure chamber communicate with each other by the high pressure introduction passage. The scroll type fluid machine according to claim 1, wherein 3. The scroll-type fluid machine according to claim 2, wherein the high-pressure introduction passage is a through hole communicating from the upper surface of the seal member to the space. 4. A closed scroll is formed by interlocking a fixed scroll having a spiral wrap standing on the inner surface of each end plate and an orbiting scroll with each other to form a closed space, and the discharge pressure of the fluid compressed in the closed space. Is introduced into a back pressure chamber formed on the back side of one scroll to apply back pressure, and the one scroll is pressed against the other scroll side. Is sealed by a ring-shaped seal member made of an elastic body and having a substantially hollow circular cross section, and the seal member is
A scroll fluid machine comprising: a space having a cross-sectional shape that expands under pressure and a high-pressure introduction passage that introduces the discharge pressure into the space. 5. The seal member is characterized in that the space inside the hollow circular shape is substantially in close contact with the seal member in the assembled state, and the space and the back pressure chamber are communicated with each other through the high pressure introduction passage. The scroll fluid machine according to claim 4, wherein 6. The scroll-type fluid machine according to claim 5, wherein the high-pressure introduction passage is a through hole communicating from the upper surface of the seal member to the space. 7. An enclosed space is formed by interlocking a fixed scroll and an orbiting scroll, each having a spiral wrap standing on the inner surface of each end plate, to form a closed space, and the discharge pressure of the fluid compressed in the closed space. Is introduced into a back pressure chamber formed on the back side of one scroll, and an intermediate pressure between the discharge pressure and the suction pressure is introduced into an intermediate back pressure chamber formed on the back side of the one scroll. In a back-pressure scroll-type fluid machine in which pressure is applied to press the one scroll against the other scroll side, a substantially U-shaped cross section made of an elastic body is provided between the back pressure chamber and the intermediate back pressure chamber. Sealing by a ring-shaped seal member having, the seal member comprising a space portion having a cross-sectional shape that expands under pressure and a high-pressure introduction passage that introduces the discharge pressure into the space portion. Scroll fluid machine according to claim. 8. The seal member is characterized in that, in the assembled state, the mating surface of the U-shaped upper part is almost in close contact, and the space and the back pressure chamber are communicated with each other by the high pressure introduction passage. The scroll type fluid machine according to claim 7, wherein 9. The scroll-type fluid machine according to claim 8, wherein the high-pressure introduction passage is a through-hole communicating from the upper surface of the seal member to the space. 10. A closed scroll is formed by interlocking a fixed scroll having a spiral wrap standing on the inner surface of each end plate and an orbiting scroll to form a closed space, and a discharge pressure of the fluid compressed in the closed space. Is introduced into a back pressure chamber formed on the back side of one scroll, and an intermediate pressure between the discharge pressure and the suction pressure is introduced into an intermediate back pressure chamber formed on the back side of the one scroll. In a back-pressure scroll-type fluid machine in which pressure is applied to press the one scroll against the other scroll, the back-pressure chamber is sealed with a ring-shaped seal member made of an elastic body and having a substantially hollow circular cross section. The seal member is
A scroll-type fluid machine comprising: a space having a cross-sectional shape that expands under pressure and a high-pressure introduction passage that introduces the discharge pressure into the space. 11. The seal member is characterized in that, in the assembled state, the space inside the hollow circular shape is substantially in close contact with each other, and the space and the back pressure chamber communicate with each other through the high pressure introduction passage. The scroll-type fluid machine according to claim 10, wherein 12. The scroll-type fluid machine according to claim 11, wherein the high-pressure introduction passage is a through hole communicating from the upper surface of the seal member to the space. 13. A closed scroll is formed by interlocking a fixed scroll and an orbiting scroll each having a spiral wrap standing on the inner surface of each end plate to form a closed space, and the discharge pressure of the fluid compressed in the closed space. , Which is introduced into a discharge port communicating with a high-pressure chamber, wherein the high-pressure chamber is sealed with a ring-shaped seal member made of an elastic body and having a substantially U-shaped cross section, and the seal member is expanded under pressure. A scroll-type fluid machine, comprising: a space having a cross-sectional shape; and a high-pressure introduction passage for introducing the discharge pressure into the space. 14. The sealing member, when assembled, has a U-shaped upper mating surface that is almost in close contact with the sealing member.
14. The scroll fluid machine according to claim 13, wherein the space and the high-pressure chamber communicate with each other by the high-pressure introduction passage. 15. The scroll-type fluid machine according to claim 14, wherein the high-pressure introduction passage is a through hole communicating from the upper surface of the seal member to the space. 16. A closed space formed by interlocking a fixed scroll and an orbiting scroll each having a spiral wrap standing on the inner surface of each end plate to form a closed space, and the discharge pressure of the fluid compressed in the closed space. A scroll-type fluid machine that introduces a high-pressure chamber into a discharge port communicating with the high-pressure chamber, wherein the high-pressure chamber is sealed with a ring-shaped seal member made of an elastic body and having a substantially hollow circular cross section.
A scroll-type fluid machine, comprising: a space having a cross-sectional shape that expands under pressure and a high-pressure introduction passage that introduces discharge pressure into the space. 17. The seal member is characterized in that, in the assembled state, the space inside the hollow circular shape is substantially in close contact with each other, and the space and the high-pressure chamber are communicated by the high-pressure introduction passage. The scroll-type fluid machine according to claim 16, wherein: 18. The scroll-type fluid machine according to claim 17, wherein the high-pressure introduction passage is a through hole communicating from the upper surface of the seal member to the space.