Rotary variable displacement compressor, air conditioner

Abstract

The application provides a variable displacement compressor and an air conditioner, wherein the variable displacement compressor comprises a variable displacement cylinder, the variable displacement cylinder is provided with a variable displacement vane, the variable displacement cylinder is further provided with a pin assembly corresponding to the variable displacement vane, the pin assembly comprises a variable displacement pin, a movable pin and an elastic member clamped between the tail of the variable displacement pin and the head of the movable pin, wherein the head of the variable displacement pin can lock and unlock the variable displacement vane. The application greatly reduces the impact of the variable displacement pin and the movable pin on the variable displacement vane respectively or the impact of the movable pin on the component for forming the stop position, reduces the high-frequency noise generated by the impact, effectively prevents the formation of pits on the component for forming the stop position of the movable pin, and improves the structural reliability of the compressor.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, specifically relating to a rotary variable capacity compressor and an air conditioner. Background Technology

[0002] Currently, variable capacity technology is widely used in dual-cylinder or multi-cylinder rotary compressors. By switching one or more cylinders out of operation through certain methods, the compressor's volume ratio can be changed, thereby reducing power consumption and improving the compressor's low-load energy efficiency. This technology can be combined with variable frequency technology to compensate for the shortcomings of variable frequency compressor capacity adjustment, improving the comfort of variable frequency heat pumps or air conditioners while effectively improving their energy efficiency.

[0003] The common variable displacement mechanism in existing rotary variable displacement compressors consists of a pin, a vane, a variable displacement physical device (such as a spring or magnet), and pressure chambers at the head and tail of the pin. The vane, the variable displacement cylinder, and the baffles and flanges covering both ends of the cylinder form a sealed cavity at the tail of the vane. This sealed cavity can selectively allow high-pressure or low-pressure gas to pass through. A pin locking and unlocking device is provided on the side of the vane. This device consists of a pin hole, a pin, and the variable displacement physical device. The head of the pin communicates with the sealed cavity, and the tail of the pin is connected to the low pressure through a flow channel. The variable displacement physical device provides a pre-acting force that propels the pin towards the vane. With the combined action of this force and the flow of high and low pressure into the sealed cavity, the pin locking and unlocking process is completed, thereby completing the operation and unloading of the variable displacement cylinder.

[0004] However, this type of variable displacement mechanism has several drawbacks: during the switching process between the working and unloading states, the switching gas force is extremely high and the action time is very short. The pin and slide are highly susceptible to collision under this gas force impact, producing abnormal noise. Furthermore, with the increase in the number of switching operations, the pin can be impacted into a circular dent on the upper surface of the lower cover plate, affecting structural reliability. In addition, because the mating length between the pin and the pin hole 31 is relatively long and requires high machining precision, any deviation will cause a decrease in the perpendicularity of the pin relative to the side of the slide, thereby increasing the impact on the slide locking groove, accelerating wear, and reducing service life. Summary of the Invention

[0005] Therefore, the present invention provides a rotary variable displacement compressor and an air conditioner, which can solve the technical problem in the prior art where, during the switching between working and unloading states of the variable displacement cylinder, the pin and the sliding vane collide under the impact of the gas force, producing abnormal noise, and the pin can be impacted to create a circular dent on the upper surface of the lower cover plate, affecting the structural reliability.

[0006] To address the aforementioned problems, the present invention provides a rotary variable displacement compressor, comprising a variable displacement cylinder having a variable displacement vane, and further comprising a pin assembly corresponding to the variable displacement vane. The pin assembly includes a variable displacement pin, a movable pin, and an elastic member clamped between the tail of the variable displacement pin and the head of the movable pin, wherein the head of the variable displacement pin is capable of locking and unlocking the variable displacement vane.

[0007] In some embodiments, the elastic element is a helical spring.

[0008] In some embodiments, the tail of the variable-capacity pin and / or the head of the movable pin are provided with receiving holes, and a portion of the elastic element is located within the receiving holes.

[0009] In some embodiments, the helical spring is in a compressed state when the variable displacement pin is locked to the variable displacement slide.

[0010] In some embodiments, the total length of the variable displacement pin is L1, the total length of the movable pin is L2, and one end of the variable displacement cylinder is provided with an end plate. The end plate is provided with a pin hole for accommodating the pin assembly, and the length of the pin hole is L, where L > L1 + L2.

[0011] In some embodiments, a cover plate is provided on the side of the end plate away from the variable displacement cylinder, and a low-pressure control chamber is constructed at the position corresponding to the opening of the pin hole on the side away from the variable displacement cylinder; the variable displacement cylinder has a high-pressure control chamber corresponding to the tail of the variable displacement slide, and the high-pressure control chamber is in communication with the head space of the variable displacement pin.

[0012] In some embodiments, the stiffness of the helical spring is k, the free length of the helical spring is a0, the fully compressed length is a1, the mass of the variable displacement pin is m, the diameter of the end face of the tail is d, and k(a0-a1)≤0.2πd 2 / 4+mg, where g is the gravitational acceleration at the location.

[0013] The present invention also provides an air conditioner including the above-described rotary variable capacity compressor.

[0014] This invention provides a rotary variable displacement compressor and air conditioner. A variable displacement pin, an elastic element, and a movable pin are combined to form a pin assembly. In this combined pin assembly, the elastic element sandwiched in the middle greatly reduces the impact of the variable displacement pin and movable pin on the variable displacement vane or on the component that stops the movable pin (such as the cover plate mentioned later) during the switching between locked and unlocked states. This reduces high-frequency noise generated by impacts and effectively prevents dents from forming on the component that stops the movable pin, improving the structural reliability of the compressor. Simultaneously, the combined pin assembly is divided into several segments in its sliding direction, each segment being relatively short, and the elastic element in the middle improves the overall fault tolerance of the pin assembly, reducing the adverse effects of form and position tolerances on the corresponding structures of the compressor. For example, it lowers the machining accuracy requirements for the variable displacement pin and movable pin, reduces the impact on the locking groove and wear on related components, and increases service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of a rotary variable capacity compressor according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 An exploded view of the pin assembly in the diagram;

[0017] Figure 3 This is a schematic diagram showing the pin assembly at the variable displacement cylinder in a locked state during single-cylinder operation of the rotary variable displacement compressor according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram showing the state of the pin assembly at the variable displacement cylinder when the rotary variable displacement compressor of this embodiment switches from single-cylinder operation to dual-cylinder operation.

[0019] Figure 5 This is a schematic diagram showing the pin assembly at the variable displacement cylinder in the unlocked state during the operation of the rotor-type variable displacement compressor in a dual-cylinder configuration according to an embodiment of the present invention.

[0020] Figure 6 This is a partial schematic diagram of a rotary variable displacement compressor according to another embodiment of the present invention.

[0021] The reference numerals in the attached figures are as follows:

[0022] 1. Variable displacement slide; 21. Variable displacement pin; 22. Movable pin; 23. Elastic element; 24. Accommodation hole; 3. End plate; 31. Pin hole; 4. Cover plate; 41. Low-pressure control chamber; 5. Variable displacement cylinder; 51. High-pressure control chamber. Detailed Implementation

[0023] See also Figures 1 to 6As shown in the embodiment of the present invention, a rotary variable displacement compressor is provided, including a variable displacement cylinder 5. The variable displacement cylinder 5 has a variable displacement vane 1. The variable displacement cylinder 5 also has a pin assembly corresponding to the variable displacement vane 1. The pin assembly includes a variable displacement pin 21, a movable pin 22, and an elastic member 23 clamped between the tail of the variable displacement pin 21 and the head of the movable pin 22. The head of the variable displacement pin 21 can lock and unlock the variable displacement vane 1. Specifically, the head of the variable displacement pin 21 has a pin head, and the corresponding side of the variable displacement vane 1 has a locking groove corresponding to the pin head. When the variable displacement cylinder 5 is unloaded, the pin head of the variable displacement pin 21 is controlled to be inserted into the locking groove to lock the variable displacement vane 1. It is understood that the rotary variable displacement compressor is a compressor with at least two cylinders, of which at least one cylinder is the aforementioned variable displacement cylinder. When the top of the aforementioned variable displacement vane 1 abuts against the outer peripheral wall of the roller in the variable displacement cylinder 5, the variable displacement cylinder is in the operating compression state, and the variable displacement vane 1 is in the unlocked state. When the variable displacement vane 1 is locked, the top of the variable displacement vane 1 is disengaged from the outer peripheral wall of the roller in the variable displacement cylinder 5, and the variable displacement cylinder is in the unloaded state.

[0024] In this technical solution, the variable displacement pin 21, the elastic element 23, and the movable pin 22 are combined to form a pin assembly. This combined pin assembly, with the elastic element 23 sandwiched in the middle, greatly reduces the impact of the variable displacement pin 21 and the movable pin 22 on the variable displacement slide plate 1 or on the components that stop the movable pin 22 (such as the cover plate 4 mentioned later) during the switching between locked and unlocked states. This reduces high-frequency noise generated by the impact and effectively prevents the formation of dents on the components that stop the movable pin 22, improving the structural reliability of the compressor. Simultaneously, the combined pin assembly is divided into several segments in its sliding direction, each segment being relatively short, and the elastic element 23 in the middle improves the overall fault tolerance of the pin assembly, reducing the adverse effects of form and position tolerances on the corresponding structures of the compressor. For example, it lowers the machining accuracy requirements for the variable displacement pin 21 and the movable pin 22, reduces the impact on the locking groove and wear on related components, and improves service life.

[0025] The aforementioned elastic element 23 can be, for example, elastic rubber with certain temperature and oil resistance properties under certain working conditions. In a preferred embodiment, the elastic element 23 is a helical spring, and its material can be metal, so as to improve the service life of the elastic element 23.

[0026] In some embodiments, the tail of the variable displacement pin 21 and / or the head of the movable pin 22 are provided with receiving holes 24, and a portion of the elastic element 23 is located within the receiving holes 24. Specifically, such as... Figure 2As shown, both the tail of the variable displacement pin 21 and the head of the movable pin 22 are provided with receiving holes 24 to guide the elastic deformation of the helical spring and ensure the reliable and stable operation of the pin assembly. In another specific embodiment, as shown... Figure 6 As shown, the receiving hole 24 is only constructed at the tail of the variable displacement pin 21, while the head of the movable pin 22 is a planar structure.

[0027] In some embodiments, when the variable displacement pin 21 is in the state of locking the variable displacement slide 1, that is, when the variable displacement cylinder is in the unloading state, the helical spring is in the compressed state. Specifically, the free length of the helical spring (that is, the state without tension or pressure) is a0, the fully compressed length (that is, the state when the pin head of the variable displacement pin 21 is completely disengaged from the locking groove) is a1, and the length of the helical spring in the compressed state, that is, the state length, is a, a1 < a < a0.

[0028] The total length of the variable displacement pin 21 is L1, and the total length of the movable pin 22 is L2. One end of the variable displacement cylinder 5 is provided with an end plate 3. The end plate 3 has a pin hole 31 for accommodating the pin assembly. The length of the pin hole 31 is L, where L > L1 + L2. The excess length of the pin hole 31 limits the ultimate compression length of the elastic element 23. The aforementioned end plate 3 is, for example, the lower flange of a compressor.

[0029] To ensure smooth switching (between the locked and unlocked states of variable displacement slider 1) under a pressure difference of 0.2 MPa, the stiffness of the helical spring, i.e., the spring stiffness k, must satisfy k(a0-a1)≤0.2πd 2 / 4+mg, where g is the gravitational acceleration at the location, in units of 1, m is the mass of the variable displacement pin 21, in units of kg, d is the end face diameter of the tail of the variable displacement pin 21, in units of mm or m, k is in units of N / mm or N / m, and a0 and a1 are in units of mm or m. It should be noted that the dimension of 0.2 in the previous formula is MPa, and the specific units of k, d, a0, and a1 are reasonably selected based on the consistency of units on both sides.

[0030] In some embodiments, a cover plate 4 is provided on the side of the end plate 3 away from the variable displacement cylinder 5. A low-pressure control chamber 41 is constructed at the position corresponding to the opening of the pin hole 31 on the side away from the variable displacement cylinder 5. The variable displacement cylinder 5 has a high-pressure control chamber 51 corresponding to the tail of the variable displacement slide 1. The high-pressure control chamber 51 is connected to the head space of the variable displacement pin 21 to realize the state switching of the pin assembly.

[0031] See also Figures 3 to 5 As shown, when the compressor is in single-cylinder operation ( Figure 3As shown in the diagram, when the variable displacement cylinder is unloading, the sliding vane cavity is under low pressure (i.e., the high-pressure control cavity 51 is under low pressure), and the tail of the movable pin is also under low pressure (i.e., the low-pressure control cavity 41 is under low pressure). At this time, there is no gas force, and the spring is in a pre-tensioned state. Relying on the pre-tensioning force, the head of the variable displacement pin contacts the side of the variable displacement sliding vane 1, restricting the movement of the vane and completing the unloading. At this time, under the action of the spring force, the bottom of the movable pin 22 contacts the lower cover plate (i.e., the aforementioned cover plate 4, hereinafter the same). When switching occurs, as... Figure 4 As shown, high-pressure gas rushes into the tail of the vane chamber for a short time, while the tail of the movable pin remains in a continuous low-pressure state. The gas force moves from high pressure to low pressure, downwards along the pin hole 31, and the spring is compressed. The gas pressure is greater than the spring force, and the head of the variable-capacity pin 21 is quickly pressed into the pin hole 31, while the tail remains stable under the spring force. Unlike conventional designs, the tail does not directly impact the cover plate, reducing rigid impact and noise transmission. The top of the movable pin is subjected to gas force, but a pressure drop already exists, greatly reducing the impact force. The impact of the bottom contacting the lower cover plate is also reduced. Subsequently, the compressor enters a stable dual-cylinder operating state, as... Figure 5 As shown.

[0032] According to an embodiment of the present invention, an air conditioner is also provided, including the rotary variable capacity compressor described above.

[0033] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A rotary variable displacement compressor, comprising a variable displacement cylinder (5), said variable displacement cylinder (5) having variable displacement vanes (1), characterized in that, The variable displacement cylinder (5) also has a pin assembly corresponding to the variable displacement slide (1). The pin assembly includes a variable displacement pin (21), a movable pin (22), and an elastic member (23) clamped between the tail of the variable displacement pin (21) and the head of the movable pin (22). This ensures that during the switching between the locked and unlocked states, the movable pin (22) is always positioned against the cover plate (4) that provides a stop for the movable pin (22) under the elastic force of the elastic member (23). Contact is made to reduce the impact of the movable pin (22) on the cover plate (4), wherein the head of the variable displacement pin (21) can lock and unlock the variable displacement slide (1); the total length of the variable displacement pin (21) is L1, the total length of the movable pin (22) is L2, one end of the variable displacement cylinder (5) is provided with an end plate (3), the end plate (3) is constructed with a pin hole (31) for accommodating the pin assembly, the length of the pin hole (31) is L, L>L1+L2.

2. The rotary variable displacement compressor according to claim 1, characterized in that, The elastic element (23) is a helical spring.

3. The rotary variable displacement compressor according to claim 1 or 2, characterized in that, The tail of the variable displacement pin (21) and / or the head of the movable pin (22) are provided with receiving holes (24), and part of the elastic element (23) is located in the receiving holes (24).

4. The rotary variable displacement compressor according to claim 2, characterized in that, When the variable displacement pin (21) is locked to the variable displacement slide (1), the helical spring is in a compressed state.

5. The rotary variable displacement compressor according to claim 1, characterized in that, The end plate (3) is covered with a cover plate (4) on the side away from the variable displacement cylinder (5). The cover plate (4) is configured with a low-pressure control chamber (41) at the position corresponding to the opening of the pin hole (31) on the side away from the variable displacement cylinder (5). The variable displacement cylinder (5) has a high-pressure control chamber (51) corresponding to the tail of the variable displacement slide (1). The high-pressure control chamber (51) is connected to the head space of the variable displacement pin (21).

6. The rotary variable displacement compressor according to claim 2, characterized in that, The stiffness of the helical spring is k, the free length of the helical spring is a0, the fully compressed length is a1, the mass of the variable displacement pin (21) is m, the diameter of the end face of the tail is d, and k(a0-a1)≤0.2πd 2 / 4+mg, where g is the gravitational acceleration at the location.

7. An air conditioner, characterized in that, The rotary variable displacement compressor includes any one of claims 1 to 6.

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