JPH09329090A - Scroll compressor - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To obtain a proper pressing force under all operating conditions without requiring a large torque at the time of starting, and to improve compression performance with high reliability. Provide a compressor. SOLUTION: The fixed scroll 7 is elastically pressed and biased in the direction of the orbiting scroll 6 so as to seal the fixed scroll and the orbiting scroll with a coil spring 15, and a force of a compressed gas generated in synchronization with a compression operation. Move in the direction,
Moving ring 16 for generating elastic force in the coil spring
And a stopper portion 1 for blocking the movement of the moving ring when the elastic force of the coil spring reaches a predetermined value so that the coil spring presses and urges the fixed scroll with a predetermined elastic force.
7 and.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor used as a compressor constituting a refrigeration cycle of an air conditioner, for example.

[0002]

2. Description of the Related Art For example, a compressor constituting a refrigeration cycle of an air conditioner has extremely low motion noise as compared with a normal rotary compressor, and a suction valve, a discharge valve, etc. are unnecessary and the number of parts is small. There is a tendency for scroll-type compressors that are small in number and have good compression performance to be used frequently.

In this type of scroll compressor, the spiral blades of a fixed scroll and the spiral blades of an orbiting scroll are meshed with each other, and a compression space is formed between these blades and the end plate of each scroll. Then, the orbiting scroll is caused to orbit, so that the refrigerant gas is sucked into the compression space, compressed, and discharged.

Incidentally, the seal of the scroll type compressor with respect to the compression space is maintained by the wing end surfaces of the fixed and orbiting scrolls being in sliding contact with the opposing scroll end plate surfaces.

That is, if the orbiting scroll is pressed firmly against the fixed scroll, the seal of the compression space is held, but on the other hand, the smooth orbiting movement of the orbiting scroll is hindered.

Further, the compression space is not always in a normal pressure state. For example, in the case of the liquid back operation in which the liquid refrigerant is sucked and compressed, the compression space falls into an abnormally increased pressure state. If this state continues for a long time, a large stress is applied to the wings of each scroll, and there is a possibility that the scroll may eventually break.

Therefore, a method has been proposed in which the fixed scroll is pressed against the orbiting scroll with an appropriate force to seal the compression space, and the above problems are solved.

For example, USP 3,874,827 (A
In the DL patent), the fixed scroll is pressed against the orbiting scroll side with a pressure obtained by combining the spring member and the discharge pressure of the compressed high-pressure gas.

Further, in Japanese Unexamined Patent Publication (Kokai) No. 58-222901 (Toyota Automatic Loom) and Japanese Unexamined Patent Publication (Kokai) No. 7-72541 (Copeland), the discharge pressure of the compressed high-pressure gas and the intermediate pressure during the compression are described. It has been proposed to press the fixed scroll against the orbiting scroll side with the combined pressure.

[0010]

However, the above-mentioned U
In SP, when the operation is stopped, the spring force required during the operation pushes the fixed scroll toward the orbiting scroll side. Therefore, a large torque is required at the time of starting, and for this reason, a motor having a large capacity for driving the compression mechanism portion must be provided, and an increase in the size of the housing and an increase in component cost and running cost cannot be avoided.

Even if a spring having a smaller elastic force is provided and the engine can be started with a smaller starting torque, the discharge pressure varies depending on the operating conditions.
The pressing force becomes excessive.

In order to avoid this, if the diameter to which the discharge pressure is applied is made small so as to obtain an appropriate pressing force even under the operating condition of high discharging pressure, the pressing force under the operating condition of small discharging pressure is reversed. Becomes insufficient, the fixed scroll easily separates from the orbiting scroll, the mutual sealability is impaired, gas leaks, and the compressibility deteriorates.

Further, in a structure in which the fixed scroll is pressed against the orbiting scroll side by utilizing the discharge pressure and the intermediate pressure, as in the technique of Japanese Patent Laid-Open No. 58-222901 and Japanese Patent Laid-Open No. 7-72541, compression is performed. Depending on the operating conditions of the machine,
The thrust force acting on the orbiting scroll and the contact force acting between the fixed scroll and the orbiting scroll become excessive.

The present invention has been made by paying attention to the above circumstances, and an object thereof is to obtain a proper pressing force under all operating conditions without requiring a large torque at the time of starting, It is an object of the present invention to provide a scroll type compressor which has improved compression performance with high reliability.

[0015]

In order to satisfy the above object, the scroll type compressor of the first invention is as follows.
The spiral wing portion of the fixed scroll and the spiral wing portion of the orbiting scroll are meshed with each other, and a compression space is formed between these wing portion and each end plate portion. In a scroll compressor that sucks compressed gas, compresses it, and discharges it, an elastic member that elastically presses the fixed scroll in the orbiting scroll direction to form a seal between the fixed scroll and the orbiting scroll, and a compression operation. The moving member that moves in the axial direction by the force of the compressed gas pressure that is generated in synchronization with the moving member that generates the elastic force in the elastic member, and the elastic member that presses and urges the fixed scroll with the predetermined elastic force. And a stopper portion for preventing the movement of the moving member when the elastic force of the member reaches a predetermined value.

According to a second aspect of the present invention, the force that is generated in synchronization with the compression operation of the first aspect and that moves the moving member is the discharge pressure of the compressed high-pressure gas. A third aspect of the invention is characterized in that the force that is generated in synchronization with the compression operation of the first aspect and that moves the moving member is an intermediate-pressure gas that has taken out the gas that is being compressed.

As a fourth aspect, the elastic member according to the first aspect is characterized in that the fixed scroll is pressed against the orbiting scroll when the compression operation is stopped. As claim 5,
A plurality of the elastic members according to claim 1 are provided and are arranged at a predetermined pitch with respect to the central axis.

In order to satisfy the above object, the scroll type compressor of the second invention is, as a sixth aspect, characterized in that the spiral blade portion of the fixed scroll is meshed with the spiral blade portion of the orbiting scroll, and these blades are engaged with each other. Part and each end plate part form a compression space,
In a scroll compressor having a compression mechanism section that causes the orbiting scroll to orbit to suck a compressed gas into a compression space, compresses it, and discharges it, a case body that houses the compression mechanism section, and a case body, A partitioning body that partitions the compression mechanism side and the discharge chamber that is the other part,
An inner cylinder portion that is provided on the discharge chamber side that is partitioned by the partition body and that forms a discharge pressure chamber that temporarily receives the high pressure gas that is compressed and discharged by the compression mechanism portion,
An outer cylinder portion provided at a predetermined distance from the inner cylinder portion and an outer cylinder portion provided on the outer peripheral portion of the inner cylinder portion and a space portion between the outer cylinder portion and the inner cylinder portion, and the compression operation is performed. A moving member that moves in the axial direction by a force generated in synchronization, a stopper portion that is provided in the outer cylinder portion and that regulates the movement amount of the moving member, and is interposed between the partition body and the moving member. And an elastic member that elastically presses and urges the fixed scroll toward the orbiting scroll side by receiving the moving force of the moving member.

A seventh aspect of the present invention is characterized in that the partition body according to the sixth aspect is one of the fixed scroll and a back pressure plate provided at a predetermined interval from the fixed scroll.

According to an eighth aspect of the present invention, the back pressure plate according to the seventh aspect includes the outer cylinder portion into which the moving member can be inserted from the facing surface opposite to the fixed scroll, and the discharge pressure check valve mechanism portion. Is provided.

Claims 1 and 6 are defined as Claim 9.
The moving member described above is a plurality of plate-shaped ring members, and is interposed between these plate-shaped ring members, and is in sliding contact with the peripheral surfaces of the inner cylinder portion and the outer cylinder portion to reduce the pressure difference between both surface sides. It is characterized by comprising a sealing member for holding.

By providing the means for solving the above problems, according to the inventions of claims 1 to 9, a large starting torque is not required, and the fixed scroll orbits the orbiting scroll under all operating conditions. To the side with an appropriate pressing force.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a part of a scroll compressor used in, for example, a refrigeration system. In the figure, reference numeral 1 denotes a closed case which is a case body, and a support frame 2 is provided in an upper portion inside the closed case 1, and a rotary shaft 3 is rotatably supported.

A compression mechanism portion 4 described later is connected to the upper portion of the rotary shaft 3, and an electric motor portion (not shown) is provided in the lower portion. The lower end of the rotary shaft 3 projects downward from the electric motor portion and is rotatably supported by a sub bearing (not shown) attached to the sealed case 1.

The compression mechanism section 4 includes the support frame 2
From the orbiting scroll 6 rotatably supported via the thrust receiver 5, the fixed scroll 7 that meshes with the orbiting scroll 6, and the fixed scroll pressing means 8 that presses and biases the fixed scroll 7 toward the orbiting scroll 6. Composed.

The orbiting scroll 6 has an end plate portion 6 having a boss portion 6c which engages with the upper end eccentric portion 3a of the rotary shaft 3.
a and a spiral wing portion 6b integrally projecting on the upper surface side of the end plate portion 6a.

The fixed scroll 7 includes an end plate portion 7a,
The end plate portion 7a is integrally formed with a spiral blade portion 7b protrudingly provided on the lower surface side and meshing with the blade portion 6b of the orbiting scroll 6. These orbiting, the end plate portion 6a of the fixed scroll 6,7,
7a and blades 6b, 7b form a pair of compression spaces S, take in the refrigerant gas that is the gas to be compressed from the peripheral end side, move to the central side, and reduce the volume thereof.
It is designed to perform a compression action.

The fixed scroll end plate portion 6a is provided with a discharge port 9 penetrating therethrough so as to communicate with the spiral center portion of the compression space S. The fixed scroll 7
Are supported so as to be movable in the axial direction for a very small predetermined distance. That is, the outer peripheral portion of the fixed scroll end plate portion 7a has a flange shape, and a plurality of pin holes 10 are provided through the upper and lower surfaces thereof. Hole for each pin 1
A screw hole 11 is provided from the upper surface of the support frame so as to communicate with 0.

Pin hole 10 of fixed scroll end plate 7a
The collar 12 is loosely inserted from the upper surface side, and the lower end edge is placed on the upper surface of the support frame 2. The upper edge of the collar 12 has a length that slightly protrudes upward from the surface of the fixed scroll end plate portion 7a.

A position regulating bolt 13 is inserted into the inner cylindrical portion of the collar 12, and the screw portion is screwed into the screw hole 11 of the support frame 2. A washer 14 is interposed between the head of the position regulating bolt 13 and the upper edge of the collar 12.

With this structure, the collar 12 is firmly inserted and fixed between the position regulating bolt 13 and the upper surface of the support frame 2 via the washer 14.
Since the collar 12 is loosely inserted into the pin hole 10 of the fixed scroll 7, the fixed scroll 7 is movable along the axial direction of the collar 12.

However, this moving range is only a very narrow range between the upper surface of the fixed scroll end plate portion 7a and the lower surface of the washer 14, and further movement is restricted by the position restricting bolt 13. That is, the gap between the upper surface of the fixed scroll end plate portion 7a and the lower surface of the washer 14 is a clearance for restricting the movement amount of the fixed scroll 7.

The fixed scroll pressing means 8 elastically presses and biases the fixed scroll 7 in the direction of the orbiting scroll 6 to compress the fixed scroll 7 and the orbiting scroll 6, which is an elastic member, and the compression. The coil spring 15 is moved by the force generated in synchronization with the operation,
A moving ring 16 that is a moving member that generates elastic force on the
And a stopper portion 17 that prevents the moving ring 16 from moving when the elastic force of the coil spring 15 reaches a predetermined value so that the coil spring can press and urge the fixed scroll with the predetermined elastic force.

To explain further, the fixed scroll mirror surface portion 7
The upper surface side of the mirror surface portion around the discharge port 9 provided in the central portion of a is an inner cylinder portion 18 that integrally projects upward. The inner cylinder portion 18 is a cylindrical body having an open top surface and communicates with the discharge port 9 so that the inside serves as a discharge pressure chamber 18a for temporarily storing high pressure gas.

The movable ring 16 is slidably engaged with the outer peripheral surface of the inner cylinder portion 18 in a structure that maintains airtightness. The upper part of the moving ring 16 projects outwardly more than the lower part, and the engaging portion with the inner cylinder part 18 has a ring-shaped cross section, but most of the moving ring 16 has a flange-like shape with a large diameter. .

The coil spring 15 is interposed between the moving ring 16 and the fixed scroll end plate portion 7a.
That is, the inner diameter of the coil spring 15 is equal to the moving ring 16
Is larger than the outer diameter of the engaging portion with respect to the inner cylinder portion 18, and the coil spring 15 abuts the lower surface of the flange portion of the moving ring 16 to elastically support the moving ring.

The upper space of the compression mechanism section 4 in the closed case 1 includes a back pressure plate 19 as a partition and the back pressure plate 1.
The discharge pressure check valve mechanism portion 20 mounted on the valve 9 divides it into upper and lower portions.

The upper side of the back pressure plate 19 along the central axis is an outer flange portion 21 with which the peripheral surface of the flange portion of the moving ring 16 is slidably engaged with the airtight state.

The stopper portion 17 is continuously provided on the lower side of the outer flange portion 21, and the stopper portion protrudes inward to the extent that it does not come into contact with the coil spring 15, and the moving ring 16 has a predetermined amount or more. At the lowered position, the flange portion of the moving ring is hooked, and further lowering is restricted.

The discharge pressure check valve mechanism section 20 closes the upper opening of the outer cylinder section 21 provided on the back pressure plate 19 at a predetermined distance from the upper edge of the inner cylinder section 18. .

A valve seat portion 22 provided with a check valve in the central portion
Is provided and communicates with the discharge port 9. In other words, the discharge port 9 communicates with the upper space of the back pressure plate 19 via the valve seat portion 22 having a check valve.

Since the inside of the closed case 1 is vertically partitioned by the discharge pressure check valve mechanism 20 and the back pressure plate 19, these upper spaces are discharge chambers 23 for temporarily collecting the discharged high pressure gas. Becomes

On the other hand, a discharge pipe 24 is connected to the upper side surface of the closed case 1, and the discharge pipe 24 is connected to the discharge chamber 23.
And a condenser (not shown) of the refrigeration system. A suction pipe (not shown) is connected to a lower side surface of the closed case 1, which is a lower space in the closed case 1 partitioned by the back pressure plate 19 and the discharge pressure check valve mechanism 20 and an evaporator (not shown) of the refrigeration system. Communicate with the vessel.

In the scroll type compressor thus constructed, when the electric motor section is energized to drive the compression mechanism section 4, low-pressure refrigerant gas is introduced from the suction pipe into the closed case 1 and The space below the pressure plate 19 is filled.

The refrigerant gas is taken into the outer peripheral side of the compression space S formed by the orbiting scroll 6 and the fixed scroll 7. Then, with the orbiting movement of the orbiting scroll 6, the compression space S is gradually transferred from the outer peripheral side to the inner peripheral side, and is compressed due to the reduction of the space capacity.

When the pressure has risen to a predetermined pressure, the compressed high pressure gas is discharged from the discharge port 9 and once discharged into the discharge pressure chamber 1.
It is stored in 8a. Then, it is guided to the discharge chamber 23 via the valve seat portion 22 of the discharge pressure check valve mechanism portion 20, filled there, and then discharged to the external condenser via the discharge pipe 24.

When the high pressure gas discharged from the discharge port 9 fills the discharge pressure chamber 18a with the start of such a compression operation, a part of the high pressure gas is discharged between the inner cylinder portion 18 and the outer cylinder portion 21. Fills the space. Then, the high-pressure gas exerts a back pressure on the movable moving ring 16.

The moving ring 16 receiving the back pressure moves downward against the elastic force of the coil spring 15. Then, when it descends by a predetermined amount, it is hooked by the stopper portion 17 and further descending is blocked.

On the other hand, the coil spring 15 is compressed and deformed by the lowering of the moving ring 16. The coil spring 15 exerts a predetermined elastic force on the fixed scroll 7 in a state in which the moving ring 16 is hooked on the stopper portion 17 and the downward movement is restricted.

Accordingly, the fixed scroll 7 is pressed against the orbiting scroll 6 by the elastic force of the coil spring 15, and the seal of the compression space S during the compression operation is completely secured. That is, efficient compression operation is performed.

Further, in the above construction, since the moving ring 16 is moved by the discharge pressure which is a force generated in synchronization with the compression operation and the elastic force is applied to the coil spring 15, the torque at the start is small. I'm sorry.

If the pressure in the compression space becomes abnormally high for some reason during the compression operation, the fixed scroll 7 is affected by the abnormally high pressure in the compression space S, and the fixed scroll 7 moves to the position regulating bolt 13
It floats up in the range of contact with. Therefore, the compression space S
The seal against is once released and a certain amount of clearance is secured.

From here, the gas of abnormally high pressure is compressed space S
It is possible to prevent external leakage, and to give stress to the wing portions 7b and 6b forming the fixed and orbiting scrolls 7 and 6 and the like. The so-called compliance function is demonstrated.

On the other hand, when the compression operation is stopped, the discharge pressure is lost and the urging force of the moving ring 16 on the coil spring 15 is removed. Then, the moving ring 16 floats up by receiving the elastic return force of the coil spring 15.

The moving ring 16 has a discharge pressure check valve mechanism portion 20.
It comes into contact with the lower surface and further lifting is restricted.
In this state, the coil spring 15 has an action of elastically urging the moving ring 16 upward and elastically moving the fixed scroll 7 downward.

That is, even when the compressor is stopped, the fixed scroll 7 comes into contact with the orbiting scroll 5 not only by its own weight but also by the elastic force of the coil spring 15 to some extent.
The sealing property in the compression space S is still ensured.

In the above embodiment, the coil spring 15 as an elastic member is formed so as to wind around the engaging portion peripheral surface of the moving ring 16, but the present invention is not limited to this, and FIG. You may make it a structure as shown.

In the figure, the constituent members other than the constituent members to be described later are the same as those described above with reference to FIG.
The same numbers are assigned and new explanations are omitted. (Same as below) That is, the elastic member 15A constituting the fixed scroll pressing means 8A is composed of a coil spring having an extremely small diameter, and a plurality of (1
This is shown). A mounting seat 25, which is a concave portion, is provided at a portion where the upper surface of the fixed scroll end plate portion 7a and the lower surface of the flange portion of the moving ring 16 that is the moving member face each other, and engages with the upper and lower end portions of the coil spring 15A.

With such a structure, the coil spring 15
Except for the fact that a plurality of A's are used, the same working effects as those of the compressor described above can be obtained. Also,
The fixed scroll pressing means 8B as shown in FIG. 3 may be used.

On the upper surface of the fixed scroll end plate portion 7a, an outer flange portion 21a is integrally projectingly provided on the outer peripheral portion at a predetermined distance from the inner cylinder portion 18. This outer flange 2
A stopper portion 17a protruding toward the inner flange portion 18 is attached and fixed to the upper end portion of 1a.

Inner flange portion 18 and outer flange portion 21
A moving member 16A, which will be described later, which is elastically pressed by the elastic member 15B, is installed between a and a and is accommodated so as to be movable in the vertical direction.

The elastic member 15B is composed of a plurality of coil springs, and is interposed between the back pressure plate 19a integrally provided with the discharge pressure check valve mechanism portion 20 and the moving member 16A.

The moving member 16A is shown enlarged in FIG. The seal member 30 having an inverted U-shaped cross section is formed in a flat ring shape. A ring plate 31, which is a metal plate, is formed on each of the upper and lower surfaces of the seal member 30,
31, the ring plate 31, with the caulking tool 32
31 and the seal plate 30 are integrally fixed by caulking.

Again, as shown in FIG. 3, such a moving member 16A is interposed between the inner and outer cylinder parts 18, 21a. The inner peripheral surface of the sealing material 30 is the peripheral surface of the inner cylinder portion 18, and the outer peripheral surface of the sealing material 30 is the outer cylinder portion 21.
It is slidably engaged with the peripheral surface of each a.

On the other hand, the compression space S formed by the fixed scroll 7 and the orbiting scroll 6, and the inner and outer flange portions 1
The space surrounded by 8, 21a and the moving member 16A communicates with each other through an intermediate pressure guide hole 33 provided in the fixed scroll end plate portion 7a.

That is, a part of the gas compressed in the compression space passes through the intermediate pressure guide hole 33 before rising to a predetermined pressure, and the inner and outer flange portions 18 and 21a and the moving member 16A.
Is guided to the space surrounded by the space. Therefore, the space surrounded by the inner and outer flanges and the moving member is referred to as an intermediate pressure chamber 34.

Therefore, when stopped, the elastic force of the coil spring 15B presses the moving member 16A, and the moving member abuts the fixed scroll end plate portion 7a to urge the elastic force. Therefore, the fixed scroll 7 contacts the orbiting scroll 6, and the seal of the compression space S is held.

With the start of the compression operation, the compression space S
From the intermediate pressure chamber 34 is guided to the intermediate pressure chamber 34 through the intermediate pressure guide hole 33, and is filled there with the fixed scroll end plate portion 7.
Intermediate back pressure is applied to a part of the inner and outer cylinder parts 18 and 21a and the moving member 16A.

Here, only the moving member 16A moves from the free position to the upper part of the drawing to contract and elastically deform the coil spring 15B. Finally, the moving member 16A is hooked on the stopper portion 17a, and further movement is blocked.

During the compression operation, the intermediate pressure gas is kept in the intermediate pressure chamber 3
4, the moving member 16A has a stopper portion 17a.
Continues hanging on. In other words, the fixed scroll 7 and the moving member 16A are in the same state as they are integrated.

Therefore, the elastic force of the coil spring 15B is transmitted to the fixed scroll 7 via the moving member 16A, the fixed scroll 7 is pressed toward the orbiting scroll 6 side, and the seal in the compression space S is maintained.

In this way, since the volume guided by the intermediate pressure is smaller than the volume guided by the discharge pressure, the coil spring 15B is compressed from the time of starting as compared with the structure which guides the discharge pressure as described above. It takes only a short time to start, and the time from starting to stabilizing time can be shortened.

FIG. 5 basically shows a compressor provided with the fixed scroll pressing means 8A shown in FIG. 2, and the so-called release mechanism 40 is also used in the refrigeration cycle circuit R.

That is, in the figure, 50 is a condenser, 51 is a throttle device, and 52 is an evaporator, and a refrigeration cycle circuit R is configured with these and the scroll compressor. The release mechanism 40 communicates with the compression space S and directly draws out the gas during compression to the refrigeration cycle circuit R.

That is, for example, if the cooling operation state in the daytime is continued until nighttime, the state becomes too cold. Therefore,
The on-off valve 41 of the release mechanism 40 is opened to return the gas in the middle of compression to the refrigeration cycle circuit R, and the cooling capacity is intentionally lowered.

The release mechanism 40 basically has a release hole 42 provided in the fixed scroll 7 and an evaporator 52 of the refrigeration cycle circuit R which is connected to the end of the release hole 42 and penetrates the closed case 1. Release pipe 43 connected to the refrigerant pipe P between the scroll compressor and the scroll compressor, and the on-off valve 41 provided in the middle of the release pipe
It is composed of

Here, a flexible pipe portion 44 is provided at the release pipe 43 portion in the closed case 1.
The flexible pipe portion 44 may be made flexible by forming a normal pipe in a coil shape.

Therefore, even if the slight vibration accompanying the orbiting movement of the orbiting scroll 6 is transmitted to the fixed scroll 7 and further to the release pipe 43 connected to the fixed scroll, the flexible pipe portion 44 is surely absorbed. Block the transmission to the outside.

That is, since the flexible pipe portion 44 is provided, the release pipe 43 can be reliably prevented from being damaged. In an air conditioner equipped with a heat pump type refrigeration cycle circuit, in order to increase the heating capacity during heating operation, a part of the refrigerant discharged from the compressor is bypassed and guided to the compression space again, so-called injection. Some have a circuit.

In this case as well, the injection pipe forming the injection circuit is connected to the end of the injection hole provided in the fixed scroll 7 and communicating with the compression space S. That is, the inside of the closed case 1 has the same configuration as that of the compressor described above with reference to FIG. 5, and therefore by providing the flexible portion at the injection pipe portion in the closed case 1, the same effect can be obtained. It will be.

In FIG. 5, the abscissa represents the conditions of use A to F of typical air conditioners, and the ordinate represents the thrust force / contact force / minimum contact force between the fixed scroll and the orbiting scroll blade tips in the present invention. To take.

When the minimum value of the contact force between the fixed scroll and the orbiting scroll of the present invention is 1, the pressing force (thrust force) and the contact force between the scrolls of the compressor of the present invention and the conventional structure are theoretically calculated. It has been graphed.

In the figure, a is the pressing force of the structure of the present invention, b is the pressing force of the conventional structure, c is the contact force of the structure of the present invention, and d is the contact force of the conventional structure. The contact force c of the structure of the present invention is the minimum under the operating condition D, and the contact force d of the conventional structure is the minimum under the operating condition C. The minimum value of each is 1, which is almost equal to each other.

On the other hand, the maximum contact force c of the structure of the present invention is about 3.2 times that of the operating condition B, and the maximum contact force d of the conventional structure is about 4.9 times that of the operating condition F. . On the other hand, regarding the pressing force, the pressing force a of the structure of the present invention is
Is about 9.7 times the operating condition F, and the maximum pressing force d of the conventional structure is 12.2 times the operating condition E.

As described above, with respect to the maximum value, the compressor having the structure of the present invention can suppress the load smaller than that of the compressor having the conventional structure, and the compression performance and the reliability can be improved. Can understand.

The scroll compressor is not necessarily limited to the one provided in the equipment constituting the refrigeration cycle, but can be used for compressing other kinds of compressed gas or air.

[0087]

As described above, according to the first aspect of the present invention, the elastic member elastically presses the fixed scroll in the orbiting scroll direction to seal each scroll, and the elastic member is synchronized with the compression operation. The elastic member has a predetermined elastic force so that the elastic member presses and urges the fixed scroll with a predetermined elastic force, which moves in the axial direction by the generated compressed gas pressure to generate an elastic force in the elastic member. Since it has a stopper that blocks the movement of the moving member when it reaches a certain value, it does not require a large torque at the time of starting, and it can obtain an appropriate pressing force under all operating conditions, and is highly reliable. Thus, it is possible to improve the compression performance.

According to the second aspect of the present invention, the force that is generated in synchronization with the compression operation and moves the moving member is the discharge pressure of the compressed high-pressure gas, so that the structure can be simplified and the seal portion can be minimized. You can

According to the third aspect of the present invention, since the force which is generated in synchronization with the compression operation and moves the moving member is the intermediate pressure gas taken out during the compression process, the fixed scroll pressing force at the time of start is The rising speed is fast and the fixed scroll is stable quickly.

According to the invention of claim 4, the elastic member presses the fixed scroll against the orbiting scroll when the compression operation is stopped. Therefore, rattling of the fixed scroll and the orbiting scroll at the time of starting is suppressed, and noise vibration is reduced. Can be obtained.

According to the invention of claim 5, since a plurality of elastic members are provided and arranged at a predetermined pitch with respect to the central axis, rattling of the fixed scroll during operation is suppressed, and high performance is achieved. obtain.

According to the invention of claim 6, inside the case body,
A partitioning body for partitioning the compression mechanism side and the other part of the discharge chamber, an inner cylinder part provided on the discharge chamber side to form a discharge pressure chamber, and provided with a predetermined distance from the inner cylinder part. The moving member that moves in the axial direction by the force generated in synchronization with the compression operation over the space between the outer cylinder portion and the inner cylinder portion, and the movement amount of the moving member provided in the outer cylinder portion are restricted. Since the stopper portion and the elastic member that elastically biases the fixed scroll to the orbiting scroll side by receiving the moving force of the moving member are provided, the seal portion is minimized to simplify the structure,
It does not require a large torque at the time of starting, can obtain an appropriate pressing force under all operating conditions, and has the effect of improving the compression performance with high reliability.

According to the invention of claim 7, since the partition body is one of the fixed scroll and the back pressure plate provided at a predetermined interval from the fixed scroll,
The structure is simplified.

According to the eighth aspect of the present invention, the back pressure plate includes the outer cylinder portion into which the moving member can be inserted from the facing surface opposite to the fixed scroll, and the discharge pressure check valve mechanism portion. Therefore, it is possible to correct and easily assemble the elastic body and the moving body without making a mistake in assembling the seal material, and improve workability.

According to the invention of claim 9, the moving member is provided between the plurality of plate-shaped ring members, and is interposed between the plate-shaped ring members, and is in sliding contact with the peripheral surfaces of the inner cylinder portion and the outer cylinder portion. Since the seal member is configured to hold the pressure difference between the two surfaces, the sealing can be surely and easily performed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the present invention with a part of a scroll compressor omitted.

FIG. 2 is a vertical cross-sectional view showing another embodiment with a part of the scroll compressor omitted.

FIG. 3 is a vertical cross-sectional view showing a scroll compressor according to still another embodiment with a part thereof omitted.

4 is a vertical cross-sectional view of a moving member used in the scroll compressor of FIG.

FIG. 5 is a vertical cross-sectional view and a refrigeration cycle circuit diagram of the scroll compressor, in which a part thereof is omitted, showing still another embodiment.

FIG. 6 is a characteristic diagram showing a comparison between the thrust force and the contact force under the operating conditions of the present invention and the conventional configuration.

[Explanation of symbols]

 7 ... Fixed scroll, 7b ... (Fixed scroll) blade portion, 7a ... (Fixed scroll) end plate portion, 6 ... Orbiting scroll, 6b ... (Orbiting scroll) blade portion, 6a ... (Orbiting scroll) end plate portion, S ... Compression space, 4 ... Compression mechanism part, 15 ... Elastic member (coil spring), 16 ... Moving member (moving ring), 17 ... Stopper part, 1 ... Case body, 23 ... Discharge chamber, 19 ... Partition plate (back pressure plate) ), 18a ... Discharge pressure chamber, 18 ... Inner cylinder part, 21 ... Outer cylinder part, 20 ... Discharge pressure check valve mechanism part, 31 ... Plate ring member, 30 ... Seal member.

Claims (9)

[Claims] 1. A spiral scroll wing portion of a fixed scroll and a spiral scroll wing portion of an orbiting scroll are meshed with each other, a compression space is formed between these wing portion and each end plate portion, and the orbiting scroll is rotated. In a scroll compressor that sucks, compresses, and discharges a compressed gas into the compression space, elastically biases the fixed scroll in the orbiting scroll direction to form an elastic seal for the fixed scroll and the orbiting scroll. A member, a moving member that moves in the axial direction by the force of the compressed gas pressure generated in synchronization with the compression operation, and generates an elastic force in the elastic member, and the elastic member presses the fixed scroll with a predetermined elastic force. A scroll compressor, comprising: a stopper portion that blocks movement of the moving member when the elastic force of the elastic member reaches a predetermined value so as to urge the elastic member. 2. A scroll type compressor characterized in that the force that is generated in synchronization with the compression operation according to claim 1 and moves the moving member is the discharge pressure of the compressed high pressure gas. 3. The scroll compressor according to claim 1, wherein the force that is generated in synchronization with the compression operation according to claim 1 and moves the moving member is a gas at an intermediate pressure, which is a gas that is being compressed. 4. The scroll type compressor according to claim 1, wherein the fixed scroll is pressed against the orbiting scroll when the compression operation is stopped. 5. A scroll compressor comprising a plurality of the elastic members according to claim 1, which are arranged at a predetermined pitch with respect to a central axis. 6. A spiral wing portion of a fixed scroll and a spiral wing portion of an orbiting scroll are meshed with each other, and a compression space is formed between these wing portion and each end plate portion to cause the orbiting scroll to orbit. In a scroll compressor having a compression mechanism section that sucks, compresses, and discharges a compressed gas in a compression space, a case body that houses the compression mechanism section, and a case body that includes the compression mechanism section side and A partition body for partitioning into a discharge chamber other than the above, and an inner cylinder provided on the discharge chamber side partitioned by this partition body and forming a discharge pressure chamber for temporarily receiving the high pressure gas compressed and discharged by the compression mechanism section. Part, an outer cylinder part provided on the outer peripheral part of the inner cylinder part at a predetermined distance from the inner cylinder part, and a space between the outer cylinder part and the inner cylinder part. A moving member that is installed over the entire part and that moves in the axial direction by a force generated in synchronization with the compression operation; a stopper part that is provided in the outer cylinder part and that restricts the moving amount of the moving member; A scroll compressor comprising: an elastic member interposed between the body and the moving member, and elastically biasing the fixed scroll toward the orbiting scroll side by receiving the moving force of the moving member. . 7. The scroll compressor according to claim 6, wherein the partition body is one of the fixed scroll and a back pressure plate provided at a predetermined interval from the fixed scroll. 8. The back pressure plate according to claim 7, further comprising the outer cylinder portion into which the moving member can be inserted from a facing surface opposite to the fixed scroll, and a discharge pressure check valve mechanism portion. A scroll type compressor characterized in that. 9. The moving member according to claim 1 or 6, wherein a plurality of plate-shaped ring members are interposed between the plate-shaped ring members, and the peripheral surfaces of the inner cylinder portion and the outer cylinder portion are provided. A scroll-type compressor which is in sliding contact with and which holds a pressure difference between both sides thereof.