阅读说明：本技术 旋转式压缩机及具有其的冷冻循环装置 (Rotary compressor and refrigeration cycle device with same ) 是由 小津政雄 王玲 于 2020-03-23 设计创作，主要内容包括：本发明公开了一种旋转式压缩机及具有其的冷冻循环装置。该旋转式压缩机包括：壳体,壳体中设置有电机和由电机驱动的压缩机构部,压缩机构部包括气缸,气缸中具有压缩腔、位于压缩腔内的转子和抵接转子外周的滑片,气缸上开设有供滑片进行往复运动的滑片槽；弹簧,弹簧设置在滑片槽的后端；弹簧控制器,弹簧控制器与弹簧相连,且弹簧控制器构造成：当电机停止后,壳体内的压力下降,弹簧控制器驱使弹簧按压滑片,当电机启动后,壳体内的压力上升,弹簧控制器自动解除弹簧对滑片的按压。根据本发明的旋转式压缩机,可在电机停止后,使弹簧按压滑片,在电机启动后,自动解除弹簧对滑片的按压,缓解弹簧的疲劳磨损与弯曲损坏现象。(The invention discloses a rotary compressor and a refrigeration cycle device with the same. The rotary compressor includes: the compressor comprises a shell, wherein a motor and a compression mechanism part driven by the motor are arranged in the shell, the compression mechanism part comprises an air cylinder, a compression cavity, a rotor positioned in the compression cavity and a sliding sheet abutted to the periphery of the rotor are arranged in the air cylinder, and a sliding sheet groove for the sliding sheet to reciprocate is formed in the air cylinder; the spring is arranged at the rear end of the slide sheet groove; a spring controller coupled to the spring, the spring controller configured to: after the motor stops, pressure in the casing descends, and spring controller orders about the spring and presses the gleitbretter, and after the motor starts, pressure in the casing rises, and spring controller removes the spring automatically and presses the gleitbretter. According to the rotary compressor, the spring can press the sliding sheet after the motor stops, and the pressing of the spring on the sliding sheet is automatically released after the motor starts, so that the fatigue wear and bending damage phenomena of the spring are relieved.)

1. A rotary compressor, comprising:

the compressor comprises a shell, wherein a motor and a compression mechanism part driven by the motor are arranged in the shell, the compression mechanism part comprises an air cylinder, a compression cavity, a rotor positioned in the compression cavity and a sliding sheet abutted against the periphery of the rotor are arranged in the air cylinder, and a sliding sheet groove for the sliding sheet to reciprocate is formed in the air cylinder;

the spring is arranged at the rear end of the slide sheet groove;

a spring controller coupled to the spring and configured to: when the motor stops, the pressure in the shell is reduced, and the spring controller drives the spring to press the sliding sheet; when the motor is started, the pressure in the shell rises, and the spring controller automatically releases the pressing of the sliding sheet by the spring.

2. The rotary compressor of claim 1, wherein the spring controller at the rear end of the vane groove has an empty tube receiving the spring, a slide valve slidably engaged with the empty tube and connected to the spring, a low pressure spring connected to the other end of the slide valve, a low pressure chamber receiving the low pressure spring, and a low pressure pipe opening the low pressure chamber and connected to the compression chamber.

3. The rotary compressor of claim 2, further comprising: the liquid accumulator is arranged on the outer side of the shell, the liquid accumulator is communicated with the compression cavity through an air suction pipe, and the low-pressure pipe is communicated with the air suction pipe.

4. The rotary compressor of claim 2, wherein the sliding valve is adapted to be slidably engaged with the empty bobbin by a pressure difference between a pressure of the casing and a pressure of the low pressure chamber.

5. The rotary compressor of claim 4, wherein the spring is attached to the rear end of the vane when a pressure difference between the pressure of the casing and the pressure of the low pressure chamber is less than a target value; when a pressure difference between the pressure of the case and the pressure of the low pressure chamber is greater than the target value, the spring is separated from the rear end of the slide.

6. The rotary compressor of claim 2 or 4, wherein the cylinder is opened with a back groove communicating with the vane groove, the back groove is located between the vane groove and the slide valve, and the back groove communicates with the inside of the housing.

7. The rotary compressor of claim 1, wherein the sliding vane has a sliding vane protrusion at a rear end thereof, the spring is a coil spring, and an outer diameter of the sliding vane protrusion is smaller than a diameter of the coil spring.

8. The rotary compressor of claim 2, wherein the spring controller further comprises: a side panel adapted to close an outer end of the hollow bobbin to form the low pressure chamber between the side panel and the slide valve within the hollow bobbin, the low pressure tube being secured to the side panel.

9. The rotary compressor of claim 1, wherein the compression mechanism part has a plurality of cylinders, wherein at least one of the cylinders is provided with the spring controller.

10. A refrigeration cycle apparatus, comprising: a condenser, an expansion valve, an evaporator, and the rotary compressor of any one of claims 1 to 9.

Technical Field

The invention relates to the field of compressors, in particular to a rotary compressor and a refrigeration cycle device with the same. The invention relates to a new technology for improving the reliability of a compressor, which can be applied to the compressors of air conditioners, refrigeration equipment, water heaters and the like, and can automatically suspend the action of pressing a coil spring (a compression spring) at the back of a sliding sheet after the compressor is started.

Background

The slide vane which abuts against the outer periphery of the rotor revolving in the compression chamber of the rotary compressor and reciprocates is a base member of the rotary compressor which sucks low-pressure gas and compresses the gas into high-pressure gas. However, since a pressure rise occurs at the time of starting the compressor, a spring for pressing the back of the vane is required.

After the compressor is started to boost pressure, a spring is not needed. This phenomenon is known to the public in patent document JPA 1998259787. However, it is difficult to automatically suspend the spring in motion after the compressor is started, and this problem continues for years.

In addition, since the adoption of the inverter motor in 1980, the rotary compressor has been reduced in size and increased in speed, and recently, from the viewpoint of reduction in size, weight, and improvement in efficiency of an Electric Vehicle (EV), the development of the speed increase of 150rps or 200rps or more has been progressing. However, as the speed of the rotary compressor is increased, the problems of fatigue wear and bending damage of the spring have become more and more significant.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the invention provides a rotary compressor, which automatically stops the movement of a spring after the rotary compressor is started, and only utilizes the gas pressure acting on the back of a sliding sheet to continuously play a compression role.

The invention also provides a refrigeration cycle device with the rotary compressor.

The rotary compressor according to an embodiment of the present invention includes: the compressor comprises a shell, wherein a motor and a compression mechanism part driven by the motor are arranged in the shell, the compression mechanism part comprises an air cylinder, a compression cavity, a rotor positioned in the compression cavity and a sliding sheet abutted against the periphery of the rotor are arranged in the air cylinder, and a sliding sheet groove for the sliding sheet to reciprocate is formed in the air cylinder; the spring is arranged at the rear end of the slide sheet groove; a spring controller coupled to the spring and configured to: when the motor stops, the pressure in the shell is reduced, and the spring controller drives the spring to press the sliding sheet; when the motor is started, the pressure in the shell rises, and the spring controller automatically releases the pressing of the sliding sheet by the spring.

According to the rotary compressor provided by the embodiment of the invention, the spring and the spring controller are arranged, so that the spring can press the sliding sheet after the motor stops, and the pressing of the spring on the sliding sheet is released after the motor starts, thereby avoiding the problems of fatigue wear and bending damage of the spring caused by the fact that the spring always moves along with the sliding sheet.

According to some embodiments of the present invention, the spring controller located at the rear end of the slide groove has an empty bobbin receiving the spring, a slide valve slidably fitted to the empty bobbin and connected to the spring, a low pressure spring connected to the other end of the slide valve, a low pressure chamber receiving the low pressure spring, and a low pressure pipe opening the low pressure chamber and connected to the compression chamber.

Further, the rotary compressor further includes: the liquid accumulator is arranged on the outer side of the shell, the liquid accumulator is communicated with the compression cavity through an air suction pipe, and the low-pressure pipe is communicated with the air suction pipe.

According to some embodiments of the invention, the sliding valve is adapted to be in sliding engagement with the empty bobbin by a pressure difference between a pressure of the housing and a pressure of the low pressure chamber.

Specifically, when the pressure difference between the pressure of the shell and the pressure of the low-pressure cavity is smaller than a target value, the spring is attached to the rear end of the slide sheet; when a pressure difference between the pressure of the case and the pressure of the low pressure chamber is greater than the target value, the spring is separated from the rear end of the slide.

According to some embodiments of the present invention, the cylinder is opened with a back groove communicating with the slide groove, the back groove is located between the slide groove and the slide valve, and the back groove communicates with the inside of the housing.

According to some embodiments of the invention, the rear end of the slider has a slider projection, the spring is a coil spring, and the outer diameter of the slider projection is smaller than the diameter of the coil spring.

Optionally, the spring controller further comprises: a side panel adapted to close an outer end of the hollow bobbin to form the low pressure chamber between the side panel and the slide valve within the hollow bobbin, the low pressure tube being secured to the side panel.

According to some embodiments of the invention, the compression mechanism portion has a plurality of cylinders, wherein at least one of the cylinders is provided with the spring controller.

According to another aspect of the present invention, a refrigeration cycle apparatus includes a condenser, an expansion valve, an evaporator, and the above rotary compressor.

The refrigeration cycle device has the same advantages of the rotary compressor compared with the prior art, and the details are not repeated herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a longitudinal sectional view of a rotary compressor in a stop state (first embodiment);

fig. 2 is a Y-Y section of the rotary compressor of fig. 1, a center plan view of a compression mechanism part;

FIG. 3 shows the action of the coil spring at the back end of the slider;

FIG. 4 is a schematic view illustrating a rotary compressor transitioning to a stable operation after starting;

FIG. 5 illustrates the components and assembly that make up the spring controller;

fig. 6 is a longitudinal sectional view of a two-cylinder rotary compressor to which a spring controller is applied (second embodiment).

Reference numerals:

2-shell, 3-exhaust pipe, 4-suction pipe, 5-compression mechanism part, 8-reservoir, 10-cylinder, 11-compression cavity, 13-slide groove, 14 a-slide groove side hole, 14 b-back groove, 15-slide, 15 c-back protrusion (slide protrusion), 16-rotor, 20-spring controller, 21-low pressure cavity, 23-low pressure pipe, 24-cylinder pipe (hollow cylinder pipe), 30-spring, 31-slide valve, 32-low pressure spring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The first embodiment:

fig. 1 is a longitudinal sectional view of a single cylinder rotary compressor 1A having a spring controller 20. Fig. 2 is a Y-Y sectional view of fig. 1, showing the internal configuration of the compression mechanism portion 5 and the spring controller 20. In fig. 1 and 2, the stopped compressor 1A is composed of a motor 6 housed in a hermetic casing 2 and a compression mechanism part 5 driven by the motor 6, a discharge pipe 3 opens to the casing 2, and a spring controller 20 and a liquid reservoir 8 are provided on the side of the casing 2.

The compression mechanism 5 includes a cylinder 10 fixed to the inner periphery of the casing 2 and having a compression chamber 11 at the center, a main bearing 36 and a sub bearing 38 for sealing the upper and lower opening surfaces of the compression chamber 11, respectively, a crankshaft 35 slidably engaged with the bearings and having an eccentric shaft 35a, a rotor 16 provided in the compression chamber 11, and a vane 15 abutting against the outer periphery of the rotor 16 and slidably engaged with a vane groove 13 of the cylinder 10.

The spring controller 20 is located at the rear end of the vane 15, connected to the outer circumference of the cylinder 10, and fixed to the housing 2, and the center of the spring controller 20 coincides with the center of the vane groove side hole 14a (fig. 2) of the cylinder 10. The spring controller 20 includes a slide valve 31 slidably fitted to the cylindrical tube 24 (fig. 2), a coil spring 30 connected to the slide valve 31, and a low pressure spring 32 for pressing the slide valve 31 in the low pressure chamber 21.

A cylindrical slide valve 31 seals and divides the internal pressure of the spring controller 20, and a spring 30 is fixed to one side of the slide valve 31, and a low-pressure spring 32 is provided in the other low-pressure chamber 21. The slide valve 31 slides inside the cylindrical tube 24 due to the pressure difference (Δ p) between both sides, and therefore the low-pressure spring 32 expands and contracts. A low pressure pipe 23 that opens into the low pressure chamber 21 is connected to the suction pipe 4 that opens into the interior of the accumulator 8. The air suction pipe 4 is connected with an air suction hole 12 (figure 2) of the air cylinder 10 and communicated with the compression cavity 11.

The pressure of the casing 2 of the stopped compressor 1A is the same as the pressure of the accumulator 8 and is low. At this time, the motor 6 is started to start the compressor 1A, and when the pressure of the casing 2 rises, the pressure at the open end of the spring controller 20 (i.e., the left end of the spring controller 20 in fig. 1) rises, and the pressure in the low-pressure chamber 21 falls.

Fig. 3 shows the action of the coil spring 30 at the rear end of the slide 15. In fig. a, after the compressor 1A is stopped, the pressure in the casing 2 decreases, the pressure difference (Δ p) with the low pressure chamber 21 decreases, and the slide valve 31 moves leftward by the spring force of the low pressure spring 32. When Δ p is 0, the slide valve 31 is at rest at the right end of the slide groove side hole 14 a. At this time, the spring 30 is embedded in the rear protruding portion 15c of the stationary slide 15 and stopped.

In fig. B, when the compressor 1A is restarted to pressurize the casing 2 to a pressure higher than that of the low pressure chamber 21, the slide valve 31 and the spring 30 are moved rightward and separated from the rear surface projection 15c of the reciprocating vane 15. At this time, the slide piece 15 reciprocates under the pressure of the case 2 acting on the back surface thereof.

That is, the vane 15 moves back and forth in the vane groove 13 while contacting the outer periphery of the revolving rotor 16 by a pressure difference between the back pressure (middle pressure Pm) acting on the back surface of the vane 15 and the pressure (low pressure to middle pressure) acting on the compression chamber 11 at the tip thereof. The pressing force of the vane due to the pressure difference is compared with the pressing force of the spring 30 required for starting the compressor 1A, and the gas pressure is overwhelmingly large.

For example, the compressor 1A is a rotary compressor mounted on a household air conditioner (refrigerant R410A), and the area of the back of the vane 15 receiving the gas pressure is setIs 0.8cm²When the pressure of the casing 2 is 1.5MPaA and the pressure of the suction pipe 4 is 1.0MPaA after about 60 seconds from the start of the compressor 1A, the back pressing force of the vane 15 is 12kgf (constant value), the tip pressing force of the vane 15 (reaction force of the compressor 11) changes between 8kgf and 10kgf, and the difference becomes the back pressing force of the vane 15 and changes within a range of 2kgf to 4 kgf.

On the other hand, the maximum pressing force (set value) of the spring 30 against the back of the slide 15 is a constant value, and the maximum pressing force is set to about 0.6kgf regardless of the area of the back of the slide 15. Therefore, in the operation of the compressor 1A, the gas pressure of the pressing force acting on the outer periphery of the rotor 16 through the vane 15 is large, and is about 3.3 to 6.6 times as large as that of the spring 30.

Thereafter, the compressor 1A enters a steady operation, and after the pressure of the casing 2 is increased to 3.0MPaA, the back pressing force on the vane 15 by the high-pressure gas is further increased, and the gas leakage at the tip of the vane 15 is reduced. Thus, the spring 30 becomes an important part required only at the start of the rotary compressor.

Fig. 4 shows the compressor 1A in steady operation. As described above, the spring 30 is separated from the vane 15, and the reciprocating vane 15 abuts against the outer periphery of the revolving rotor 16 by the gas pressure.

The low-pressure gas sucked into the suction pipe 4 having the hole formed in the accumulator 8 is compressed in the compression chamber 11 to become high-pressure gas, and the high-pressure gas discharged through the hole formed discharge hole 36a and the discharge valve 36b is discharged to the inside of the casing 2 through the muffler 36 c. The high-pressure gas discharged from the gas discharge pipe 3 becomes a liquid refrigerant in the condenser 50, and the low-pressure refrigerant passing through the expansion valve 51 becomes a low-pressure gas in the evaporator 52, and flows into the accumulator 8.

Fig. 5 shows the constituent components of the spring controller 20 and the assembly thereof. First, the close-fitting coil 30b formed at the right end of the spring 30 is screwed into the turnbuckle 31a inside the slide valve 31, and the spring 30 is coupled to the slide valve 31 without being loosened by the elastic force effect of the spring 30.

Next, the slide valve 31 to which the spring 30 is fixed is inserted into the cylindrical pipe 24, and the low pressure spring 32 is inserted from the right opening end of the cylindrical pipe 24. Thereafter, the side plate 22 to which the low-pressure pipe 23 is fixed is resistance-welded to the cylindrical pipe 24, and the spring controller 20 is completed.

In addition, the following methods are recommended: when the spring controller 20 is connected to the housing 2, the compression mechanism 5 is spot-welded to the inner diameter of the housing 2, then the air suction pipe 4 (fig. 2) is followed by fixing only the cylindrical pipe 24 to the side hole of the housing 2, then the slide valve 31 to which the spring 30 is fixed and the low pressure spring 32 are inserted in order from the open end of the cylindrical pipe 24, and finally the side plate 22 to which the low pressure pipe 23 is fixed is resistance-welded to the cylindrical pipe 24.

As shown in fig. 1, since the spring controller 20 connected to the side surface of the casing 2 protrudes in the side surface area of the accumulator 8 having an outer diameter of about 60mm to 70mm, there is no problem in disposing the compressor 1A in the outdoor unit of an air conditioner, for example.

Second embodiment:

the compression mechanism 5B housed in the casing 2 of the two-cylinder rotary compressor 1B shown in fig. 6 includes a first cylinder 10A and a second cylinder 10B. The suction pipes 4a and 4b are connected to the side surfaces of these cylinders, respectively, and the spring controller 20 is connected to the first cylinder 10A as in the first embodiment. The low pressure pipe 23 of the spring controller 20 is connected to the suction pipe 4 a.

The a vane 15a and the B vane 15B are connected to an a rotor 16a and a B rotor 16B that revolve in an a compression chamber 11a and a B compression chamber 11B provided in the first cylinder 10A and the second cylinder 10B, respectively.

When the compressor 1B is started, the slide sheet a 15a reciprocates, the pressure of the casing 2 rises, the slide sheet B15B starts to move after 5 to 10 seconds by the pressure rise of the casing 2, and the two slide sheets start to suck and compress low-pressure gas.

After about 15 seconds of starting, since the spring 30 will be separated from the a sliding piece 15a as in the first embodiment, the a sliding piece 15a and the B sliding piece 15B respectively follow the a rotor 16a and the B rotor 16B under the gas pressure of the casing 2, and the double cylinder compression continues to operate.

After the compressor 1B is stopped, the two vanes are in contact with the outer peripheries of the two pistons (i.e., rotors). At this time, as the pressure of the case 2 decreases, the spring 30, which is stationary in the spring controller 20, starts to move and return to the back of the a slide 15 a. Thereafter, the compressor 1B can be restarted when Δ P becomes zero.

The multi-cylinder rotary compressor is similar to the double-cylinder rotary compressor, and the description is omitted here. In the rotary compressor having two or more cylinders, if the spring controller 20 is provided in any one of the cylinders, all the cylinders can suck and compress gas even if all the springs of the other cylinders are omitted.

The rotary compressor according to the embodiment of the invention has the following beneficial effects:

(1) in the rotary compressor using the coil spring 30 to perform the reciprocating action of the vane 15, it is possible to prevent a failure of the spring, thereby preventing a failure of the compressor due to abrasion of the spring.

(2) The spring controller 20 may be automatically controlled according to the pressure variation of the compressor. I.e. without the use of electronic controls and electrical components.

(3) Therefore, by mounting the present invention on an existing machine or replacing the present invention with the existing machine, the reliability of the machine can be improved.

(4) In the future, this technique is required for high-speed operation of a rotary compressor mounted on a desired EV. That is, the reliability of the components can be improved regardless of the operating speed of the compressor.

(5) The reliability of a multi-compressor system having a plurality of multi-cylinder rotary compressors mounted thereon is improved.

(6) The invention can be applied to not only a vertical rotary compressor but also a horizontal rotary compressor.

A rotary compressor according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 6.

Referring to fig. 1, 4 and 6, a rotary compressor according to an embodiment of the present invention may include: a housing 2, a spring 30 and a spring controller 20.

Be provided with motor 6 in the casing 2 and by motor 6 driven compression mechanism portion 5, compression mechanism portion 5 includes cylinder 10, has compression chamber 11 in the cylinder 10, is located the rotor 16 of compression chamber 11 and the gleitbretter 15 of butt rotor 16 periphery, offers on the cylinder 10 to supply gleitbretter 15 to carry out reciprocating motion's gleitbretter groove 13, and spring 30 sets up the rear end at gleitbretter groove 13.

The spring controller 20 is connected to the spring 30, and the spring controller 20 is configured to: when the motor 6 stops, the pressure in the housing 2 decreases, and the spring controller 20 drives the spring 30 to press the sliding piece 15, specifically, the rear end of the sliding piece 15; when the motor 6 is started, the pressure in the housing 2 rises, and the spring controller 20 automatically releases the pressing of the slide 15 by the spring 30.

When the pressure in the housing 2 rises to a certain target value, the sliding piece 15 no longer needs to be pressed by the spring 30, therefore, the spring controller 20 automatically releases the pressing of the spring 30 on the sliding piece 15 under the action of the pressure of the housing 2, and the problems of fatigue wear and bending damage of the spring 30 caused by the fact that the spring 30 always moves back and forth along with the sliding piece 15 can be relieved or even avoided.

In other words, the operation of releasing the pressing of the slide 15 by the spring 30 is automatically performed when the pressure in the casing 2 rises to a certain target value, and it is not necessary to take part in human work, and it is not necessary to use electronic control and electric parts, which is advantageous for simplifying the structure of the rotary compressor.

According to the rotary compressor of the embodiment of the invention, the spring 30 and the spring controller 20 are arranged, the spring 30 can be enabled to press the sliding vane 15 after the motor 6 is stopped, and the pressing of the spring 30 on the sliding vane 15 is automatically released after the motor 6 is started, so that the problems of fatigue abrasion and bending damage of the spring 30 caused by the fact that the spring 30 always moves along with the sliding vane 15 are relieved and even avoided, the failure occurrence rate of the spring 30 is reduced, and the compressor failure caused by the abrasion of the spring 30 is further reduced.

The spring controller 20 is provided at the rear end of the slide groove 13, and as shown in fig. 3 and 5, the spring controller 20 includes an empty tube 24, a slide valve 31, a low pressure spring 32, a low pressure chamber 21, and a low pressure pipe 23. The hollow tube 24 is hollow and can be used for accommodating the spring 30, the sliding valve 31 is in sliding fit with the hollow tube 24, one end of the sliding valve 31 is connected with the spring 30, the low-pressure spring 32 is connected with the other end of the sliding valve 31, the low-pressure cavity 21 is formed in the hollow tube 24 and is used for accommodating the low-pressure spring 32, and the low-pressure tube 23 opens a hole in the low-pressure cavity 21 and is communicated with the compression cavity 11.

The outer peripheral surface of the slide valve 31 is in contact with the inner peripheral surface of the hollow bobbin 24, and the hollow bobbin 24 may be a cylindrical or square tube or a bobbin of another shape.

Further, as shown in fig. 1-2, the rotary compressor further includes a liquid receiver 8, the liquid receiver 8 is disposed outside the casing 2, the liquid receiver 8 is communicated with the compression chamber 11 through the suction pipe 4, and the low pressure pipe 23 is communicated with the suction pipe 4.

The slide valve 31 is adapted to be slidably fitted with the empty bobbin 24 by a pressure difference between the pressure of the housing 2 and the pressure of the low pressure chamber 21. For example, when the pressure of the housing 2 is less than the pressure of the low pressure chamber 21, the slide valve 31 slides leftward along the empty bobbin 24; when the pressure of the housing 2 is greater than the pressure of the low pressure chamber 21, the slide valve 31 slides rightward along the empty bobbin 24.

Specifically, when the differential pressure between the pressure of the casing 2 and the pressure of the low-pressure chamber 21 is smaller than the target value, the gas pressing force due to the differential pressure is smaller than the repulsive force of the spring 30, and at this time, the spring 30 abuts on the rear end of the slide piece 15. When the pressure difference between the pressure of the casing 2 and the pressure of the low pressure chamber 21 is larger than the target value, the gas pressing force by the pressure difference is larger than the repulsive force of the spring 30, and at this time, the spring 30 is separated from the rear end of the slider 15.

As shown in fig. 2 to 3, the cylinder 10 is provided with a back surface groove 14b communicating with the slide groove 13, the back surface groove 14b is positioned between the slide groove 13 and the slide valve 31, and the back surface groove 14b communicates with the inside of the housing 2, so that the pressure in the back surface groove 14b is equal to the internal pressure of the housing 2. The pressure in the back surface groove 14b is the back pressure of the slide sheet 15, and pushes the slide sheet 15 to reciprocate.

When the pressure difference between the pressure in the back surface groove 14b and the pressure in the low pressure chamber 21 is smaller than the target value, the spring 30 abuts on the rear end of the slider 15. When the pressure difference between the pressure in the back groove 14b and the pressure of the low pressure chamber 21 is greater than the target value, the spring 30 is separated from the rear end of the slider 15.

As shown in fig. 2-3, the rear end of the sliding piece 15 has a sliding piece protrusion 15c, the spring 30 is a coil spring 30, and the outer diameter of the sliding piece protrusion 15c is smaller than the diameter of the coil spring 30, so that when the spring 30 is attached to the rear end of the sliding piece 15, the sliding piece protrusion 15c can extend into the coil of the coil spring 30, and the coil spring 30 and the rear end of the sliding piece 15 are prevented from sliding relatively.

Optionally, the spring controller 20 further comprises a side panel 22, as shown in fig. 3 and 5, the side panel 22 is adapted to close the outer end (i.e. the right end in fig. 5) of the empty bobbin 24 to form the low pressure chamber 21 between the side panel 22 and the sliding valve 31 in the empty bobbin 24, the low pressure pipe 23 is fixed on the side panel 22, and one end of the low pressure pipe 23 is communicated with the low pressure chamber 21, and the other end is communicated with the air suction pipe 4.

The compression mechanism portion 5 has a plurality of cylinders 10, wherein at least one cylinder 10 is provided with a spring controller 20. For example, only one cylinder 10 may be provided with the spring controller 20, two cylinders 10 may be provided with the spring controllers 20, or all cylinders 10 may be provided with the spring controllers 20.

A refrigeration cycle apparatus according to another aspect of the embodiment of the present invention includes a condenser 50, an expansion valve 51, an evaporator 52, and the rotary compressor of the above-described embodiment.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.