JP6609051B2 - Sliding vane control structure of variable volume cylinder, variable volume cylinder and variable capacity compressor - Google Patents

Description

The present invention relates to a technical field of a compressor, and more particularly to a sliding vane control structure of a variable volume cylinder, a variable volume cylinder provided with such a sliding vane control structure, and a variable capacity compressor.
This application is filed with the Chinese Patent Office on December 18, 2015, with an application number of 20151019605018. X claims the priority of the Chinese patent application whose title is “sliding vane control structure of variable volume cylinder, variable volume cylinder and variable capacity compressor”, the entire contents of which are incorporated herein by reference. .

  The compressor body has a main cylinder and a variable volume cylinder, which is a general structure of a conventional variable capacity compressor. The variable volume cylinder may or may not be operated, thereby changing the operating capacity. To meet the different load requirements of the cooling system and achieve the purpose of energy saving. Conventional variable volume cylinders usually employ a so-called pin-sliding vane switching method, that is, a sliding cavity is formed at the tail of the sliding vane with a sliding vane, cylinder, bearings and partition plates, etc. covered at both ends of the cylinder. Formed, the sealed cavity can be selectively introduced with high pressure / low pressure gas, and a pin lock / unlock device is provided on the side of the sliding vane, the device comprising a pin hole, pin, spring, etc. The head of the pin is connected to the sealed cavity, low pressure is introduced into the tail of the pin via a low pressure passage, and the physical device (eg, spring, magnet, etc.) causes the pin to pretension close to the sliding vane Have In the above-described method, when normal operation of the variable capacity cylinder is required, high-pressure refrigerant gas must be introduced into the sealed cavity, and the refrigerating machine oil in the sealed cavity is discharged by the high-pressure refrigerant gas. In order to ensure that the pin slides up and down in the pin hole, a constant gap is maintained between the pin and the pin hole, so that it is not possible to realize a gap seal of the lubricating oil, and the viscosity of the refrigerant Is much smaller than the lubricant, so there is a defect that the leak rate in the gap is increased. For this reason, the conventional configuration significantly increases the amount of refrigerant leaking from the sealed cavity to the suction port of the variable volume cylinder through the gap on the side surface of the pin, leading to a decrease in volume efficiency and performance of the variable capacity cylinder. Since it is impossible to perfectly match the gaps between different compressors during mass production, the cooling / heating capacity of the compressors will change drastically, leading to quality control stability of compressors and air conditioner products. There is an adverse effect that it is disadvantageous.

  In view of this, in order to solve at least a part of the above-described problems, the present invention provides a sliding vane control structure for a variable volume cylinder capable of ensuring a sealing effect, and a variable volume cylinder provided with such a sliding vane control structure. A variable capacity compressor is also provided.

  According to a first aspect of the present invention, there is provided a sliding vane control structure for a variable volume cylinder, wherein the sliding vane control structure is provided at a lower side of the sliding vane and is capable of locking the sliding vane. And a pin having a second position separable from the sliding vane, a low pressure passage is provided below the pin, a face seal structure is provided between the pin and the low pressure passage, and the pin is in the second position. In some cases, a face seal is formed at the lower end of the pin.

  The pin is provided in the pin hole, the pin hole is a stepped hole, and the pin hole is formed such that the inner diameter of the portion near the lower end is smaller than the inner diameter of the upper portion. It is preferable that a step surface extending radially inward is formed at a portion near the lower end.

  A seal gasket is provided on the stepped surface, and the lower end of the pin can be strongly crimped to the upper surface of the seal gasket, and the surface seal is formed between the lower end of the pin and the upper surface of the seal gasket. It is preferable.

  A through hole is preferably formed in the center of the seal gasket.

  A seal partition plate is provided on the lower side of the pin, and a lower end of the pin can be brought into contact with an upper surface of the seal partition plate, and between the lower end of the pin and an upper surface of the seal partition plate. The face seal is preferably formed.

  It is preferable that a concave groove is provided at a lower portion of the pin, and a first through hole is provided at a position corresponding to the concave groove of the sealing partition plate.

  It is preferable that the maximum size of the first through hole in a horizontal plane is smaller than the maximum outer diameter of the pin.

  The maximum size of the first through hole in the horizontal plane is preferably smaller than the maximum size of the concave groove in the horizontal plane.

  Preferably, the sealing partition plate is provided with a second through hole, and the second through hole allows the low pressure passage to communicate with the suction hole of the variable volume cylinder.

  According to a second aspect of the present invention, there is provided a variable volume cylinder provided with the sliding vane control structure in the present application.

  According to the third aspect of the present invention, there is provided a variable capacity compressor provided with the variable volume cylinder in the present application.

  In the present application, a face seal structure is provided between the pin and the low pressure passage, and the sealing effect by the face seal is far superior to the gap seal, greatly reducing the amount of refrigerant leakage, and the variable volume cylinder is operated. Improve compressor efficiency when in mode and optimize compressor performance. In the present application, since the above-described face seal structure is provided and the sealing effect is excellent, the pin hole processing accuracy requirement is lowered, the pin hole processing cost and the assembly cost are reduced, and the production quality of the compressor is stabilized. Plan

It is a structure schematic diagram when the variable capacity cylinder in the variable capacity compressor by a prior art is in a normal operation mode. It is a structure schematic diagram in case the variable capacity cylinder in the variable capacity compressor by a prior art is in removal mode. It is the elements on larger scale of the AA cross section in FIG. FIG. 4 is a structural schematic diagram of one preferred embodiment of the present invention (corresponding to the portion shown in FIG. 3). It is a structure schematic diagram of the other suitable Example of this invention (corresponding | corresponding to the part shown in FIG. 3).

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings to make the above-described and other objects, features, and advantages of the present invention clearer.

  Hereinafter, various embodiments of the present invention will be described in more detail with reference to the drawings. In the drawings, the same or similar reference numerals are given to the same members. For the sake of clarity, each part in the drawing is not drawn to scale.

  Note that the terms “upper”, “lower”, “front”, “rear”, “left”, “right” and similar expressions used in the text are merely for explanation, and It is not intended to limit the structure.

  As shown in FIGS. 1 to 3, the pump assembly of the variable capacity compressor includes a crankshaft 1, an upper bearing 4 coupled to the crankshaft 1, a lower bearing 5, a cover plate 7, and an upper bearing 4 and a lower bearing 5. The 1st cylinder 2 and the 2nd cylinder 3 which are interposed between are provided. The first cylinder 2 and the second cylinder 3 are separated by a partition plate 6, and the second cylinder 3 is a variable volume cylinder. The upper bearing 4, the first cylinder 2, the partition plate 6, the second cylinder 3, the lower bearing 5 and the cover plate 7 are attached in order along the axial direction of the crankshaft 1 of the compressor. The first cylinder 2 is provided with a first sliding vane groove, the first sliding vane 10 is provided in the first sliding vane groove, and the first sliding vane 10 is provided with the elasticity of a spring provided on the back thereof. The first sliding piston 8 is pressed against the first rolling piston 8 by the action of the first sliding vane 10 and the outer surface of the first rolling piston 8 in contact with each other, thereby dividing the internal cavity of the first cylinder 2 into a suction chamber and a compression chamber. A second sliding vane groove is provided in the second cylinder 3, the second sliding vane is provided in the second sliding vane groove, and a back portion of the second sliding vane 11 (in FIG. 1, the second sliding vane). A sealed cavity 18 is formed on the right side of the vane 11, and a pressure switching pipe 12 is provided in the sealed cavity 18, and the pressure switching pipe 12 can be connected to an external air source (not shown). The external air source is preferably high pressure / low pressure gas from the discharge / suction port of the compressor. The pressure switching pipe 12 can be connected to an external air source via a control valve, and the control valve preferably uses, for example, an electromagnetic valve or a three-way valve. The switching of the high / low pressure gas introduced into the pressure switching pipe 12 is controlled so that the low pressure gas can be introduced. When the high pressure gas is introduced into the pressure switching pipe 12, the second sliding vane 11 is pressed against the second rolling piston 9 by the action of the gas pressure that has been introduced, and the second sliding vane 11 and the second rolling vane 11 are pressed. When the outer surface of the piston 9 comes into contact, the internal cavity of the second cylinder 3 is divided into a suction chamber and a compression chamber. The first rolling piston 8 and the second rolling piston 9 are fixed to the eccentric portion of the crankshaft 1 of the compressor, and are moved by the crankshaft 1 of the compressor to rotate eccentrically in the cylinder, thereby forming an internal cavity of the cylinder. Compress the refrigerant gas.

  A pin hole 17 is provided in the lower bearing 5, and the axis of the pin hole 17 is preferably parallel to the axis of the crankshaft 1 of the compressor, and the upper end of the pin hole 17 is formed in the sealed cavity 18. Communicate. A low pressure passage 15 (see FIG. 3) communicating with the suction hole 16 of the second cylinder is provided below the pin hole 17, and a part of the low pressure passage 15 is provided in the cover plate 7. It is preferable. A pin 13 is provided in the pin hole 17, and the pin 13 can move up and down in the pin hole 17. A biasing member 14 is provided below the pin 13, and the biasing member may be a physical device such as a spring, and the biasing member 14 exerts an upward biasing force on the pin 13. Give. It is preferable that a concave groove 131 is provided on the lower side of the pin 13, and the urging member 14 is provided between the top wall of the concave groove and the cover plate 7 below the pin 13. A pin groove 111 (see FIG. 1) that can be fitted to the upper end of the pin 13 is provided on the lower surface of the second sliding vane 11 so that the end of the pin 13 moves downward while the pin 13 moves upward. 5, the upper end portion of the pin 13 can extend into the pin groove 111 of the second sliding vane 11, so that the second sliding vane 11 can be moved to the locked position (in this case, the pin 13 is Locked in the first position).

  When high-pressure gas is introduced into the pressure switching pipe 12, the pin 13 resists the pretension of the biasing member 14 and the gas pressure in the low-pressure passage by the action of the high-pressure gas, so that the pin 13 faces downward. In order to move away from the pin groove 111 on the second sliding vane 11 while moving, the pin 13 is in an unlocked position that does not restrict the second sliding vane 11 (in this case, the pin 13 is in the second position), The second sliding vane 11 is pressed against the second rolling piston 9 by the action of the high-pressure gas at the back, and the head of the second sliding vane 11 comes into contact with the outer surface of the second rolling piston 9, thereby A normal compression process of the cylinder 3 (variable volume cylinder) is realized.

  When a low pressure is introduced into the pressure switching pipe 12, the head (upper end) and tail (lower end) of the pin 13 are pressure balanced, and the pin 13 is moved by the pretensioning action of the biasing member 14. When the second sliding vane 11 moves upward so as to approach the second sliding vane 11 and the second sliding vane 11 is driven to a position facing the head of the pin 13 of the pin groove 111, the head of the pin 13 is The second sliding vane 11 is locked by being inserted into the pin groove 111 of the two sliding vanes 11, and in this case, since the second sliding vane 11 is separated from the second rolling piston 9, The second cylinder 3 cannot operate normally, and the second cylinder 3 (variable volume cylinder) is removed.

  1-3, when high pressure gas is introduced into the pressure switching pipe 12, the refrigerating machine oil in the sealed cavity 18 is discharged by the high pressure refrigerant gas in the sealed cavity 18, as shown in FIG. There is a defect. In order to ensure that the pin 13 slides up and down in the pin hole 17, a certain gap is always maintained between the pin 13 and the pin hole 17, and when the refrigeration oil is discharged, a gap seal for the lubricating oil is used. Therefore, the high-pressure refrigerant gas leaks outward in the direction indicated by the arrow in FIG. 3 along the gap between the outer wall of the pin 13 and the inner wall of the pin hole 17. The high-pressure refrigerant gas enters the suction hole 16 of the second cylinder 3 through the gap between the outer wall of the pin 13 and the inner wall of the pin hole 17 and the low-pressure passage 15 below the pin 13, and is expanded by the expansion of the high-pressure refrigerant gas. The amount of actual gas circulation by the second cylinder 3 is reduced, the compression of the leaked gas is repeated, the cooling capacity is lowered, and extra power consumption occurs. Operation performance when operating with a cylinder will be reduced.

  The present invention is an improvement of the variable displacement compressor described in the prior art described above by providing the sliding vane control structure of the variable displacement compressor of the present invention, that is, the sliding vane control of the present invention. The structure is applied to a variable capacity compressor provided with the structure and members described above. Hereinafter, the sliding vane control structure of the variable capacity compressor according to the present invention will be described in detail. However, in order to avoid duplication, the description of the same parts as those described above will be omitted.

  As shown in FIG. 4, in one preferred embodiment of the present invention, the second cylinder 103 of the variable capacity compressor is provided above the lower bearing 105 and a cover plate 107 is provided below the lower bearing 105. ing. The lower bearing 105 is provided with a pin hole 117 having a stepped shape, and the pin hole 117 is formed such that the inner diameter of the portion near the lower end is smaller than the inner diameter of the upper portion. A step surface extending inward in the radial direction is formed at a portion near the lower end, and a seal gasket 109 is provided on the step surface, and the seal gasket 109 is preferably a metal seal gasket or a rubber seal gasket. Not limited to this. The seal gasket 109 is an annular seal gasket and has a through hole at the center. The pin 113 provided with a concave groove 1131 on the lower side is provided in the pin hole 17, and the lower end surface of the pin 113 can contact the upper surface of the seal gasket 109 on the step surface. In the concave groove 1131 of the pin 113, there is provided a biasing member 114 that passes through a through hole on the seal gasket 109 and contacts the cover plate 107, and the biasing member 114 is a spring. It is preferable that an upward biasing force is applied to the pin 113. The lower end of the pin 113 communicates with the low pressure passage 115 in the cover plate 107 and further communicates with the suction hole 116 of the second cylinder 103. The seal gasket 109 is made of metal or rubber.

  When the second cylinder 103 of the variable capacity compressor in the above-described embodiment of the present invention operates normally, high-pressure refrigerant gas is introduced into a sealed cavity (not shown) above the pin 113, and the action of the high-pressure refrigerant gas. Thus, the pin 113 resists the action of the pretension of the urging member 114 and the gas pressure in the low pressure passage, and the pin 113 moves downward to the second position in the pin hole 117, so that the pin 113 is Simultaneously with the separation from the sliding vane of the second cylinder 103, the lower end of the pin 113 is strongly pressed against the upper surface of the seal gasket 109, and a face seal is formed at the lower end of the pin 113. In this case, the second cylinder 103 performs a normal compression operation. The high-pressure refrigerant gas flows downward along the gap between the pin 113 and the pin hole 117, but the lower end of the pin 113 is strongly pressed against the seal gasket 109. Thus, a face seal structure is formed, and a face seal is formed between the gap between the pin 113 and the pin hole 117 and the low pressure passage 115 below the pin 113. Since the sealing performance of the face seal structure is far superior to the gap seal between the pin 113 and the pin hole 117, the amount of refrigerant leakage is greatly reduced, and the performance of the compressor is effectively improved. Improve.

  As shown in FIG. 5, in another preferred embodiment of the present invention, the second cylinder 203 of the variable capacity compressor is provided above the lower bearing 205, and below the lower bearing 205 is a sealing partition plate 218 and A cover plate 207 is provided in order. A pin hole 217 is provided in the lower bearing 205, and a pin 213 with a concave groove 2131 is provided in the pin hole 217. An urging member 214 capable of generating pretension, for example, a spring, is provided between the top wall of the concave groove 2131 of the pin 213 and the sealing partition plate 218 below the pin 213. A first through hole 219 is provided at a position corresponding to the groove 2131 on the pin hole 17 in the seal partition plate 218. It is preferable that the maximum size of the through hole 219 in the horizontal plane is smaller than the outer diameter of the pin 213 so that the lower end of the pin 213 can be brought into contact with the upper surface of the sealing partition plate 218. The maximum size of the through hole 219 in the horizontal plane is smaller than the maximum size of the concave groove 2131 in the horizontal plane so that the bottom of the urging member 214 can be brought into contact with the upper surface of the sealing partition plate 218. It is more preferable. When the through hole 219 is a round hole, its diameter is the maximum size. The cover plate 207 is provided with a low pressure passage 215 that communicates with the suction hole 216 of the second cylinder, and the low pressure passage 215 communicates with the suction hole 216 of the second cylinder 203. A second through hole 220 is preferably provided in the seal partition plate 218. The low-pressure passage 215, the first through-hole 219, and the second through-hole 220 are not installed in a unique manner, but can have various structural types, and the lower side of the pin 213 is the second cylinder 203. What is necessary is just to communicate with the suction hole 216. The seal partition plate 218 is preferably machined or pressed.

  When the second cylinder 203 of the variable capacity compressor in the above-described embodiment of the present invention operates normally, high-pressure refrigerant gas is introduced into a sealed cavity (not shown) above the pin 213. By the action of the high-pressure refrigerant gas, the pin 213 resists the action of the pretension of the urging member and the gas pressure in the low-pressure passage, and the pin 213 moves downward in the pin hole 17 to the second position, The pin 213 is separated from the sliding vane of the second cylinder 203. In this case, the second cylinder 203 performs a normal compression operation. The high-pressure refrigerant gas flows downward along the gap between the pin 213 and the pin hole 217, but surface contact is formed between the bottom end surface of the pin 213 and the sealing partition plate 218, A face seal is formed at the lower end, and the lower end of the pin 213 is strongly pressed against the upper end surface of the seal partition plate 218 by the action of the pressure difference between the two ends. Therefore, the lower end of the pin 213 and the upper end surface of the seal partition plate 218 Since the face seal structure is far superior to the gap seal between the pin 213 and the pin hole 217, the amount of refrigerant leakage is greatly reduced. In addition, the performance of the compressor is improved.

  In the present application, a face seal structure is provided between the pin and the low pressure passage, and the sealing effect by the face seal is far superior to the gap seal, greatly reducing the amount of refrigerant leakage, and the variable volume cylinder is operated. Improve compressor efficiency when in mode and optimize compressor performance. In the present application, since the above-described face seal structure is provided and the sealing effect is excellent, the pin hole processing accuracy requirement is lowered, the pin hole processing cost and the assembly cost are reduced, and the production quality of the compressor is stabilized. Plan

  Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular implementation purposes only and is not intended to be limiting of the invention. Terms such as “part” described in the text may represent a single part or a combination of a plurality of parts. In addition, terms such as “attach” and “installation” described in the text may mean that one member is directly connected to another member, and one member is connected to the other via an intermediate member. It may mean that it is connected to the member. In this text, features described in one embodiment may be applied to other embodiments, alone or in combination with other features, unless otherwise described or otherwise specifically described. it can.

While the invention has been described in terms of the above-described embodiments, it will be understood that the above-described embodiments are merely for listing and description purposes and are not intended to limit the invention to the scope of the described embodiments. It should be. It will be understood by those skilled in the art that various other variations and modifications are possible based on the teachings of the present invention, and all these variations and modifications are within the scope of the present invention.

Claims (7)

A pin ( 213) provided on a lower side of the sliding vane (11) and having a first position capable of locking the sliding vane (11) and a second position separable from the sliding vane (11);
A variable vane cylinder sliding vane control structure in which a low pressure passage ( 215) is provided below the pin,
When a face seal structure is provided between the pin ( 213) and the low pressure passageway ( 215), and the pin ( 213) is in the second position, a face seal is formed at the lower end of the pin ( 213). Formed ,
A seal partition plate (218) is provided below the pin (213), and a lower end of the pin (213) can be brought into contact with an upper surface of the seal partition plate (218), and the pin (213) ) And the upper surface of the sealing partition plate (218), the face seal is formed.
A sliding vane control structure characterized by that. A concave groove (2131) is provided in the lower portion of the pin (213), and a first through hole (219) is provided at a position corresponding to the concave groove (2131) of the sealing partition plate (218). ,
The sliding vane control structure according to claim 1 . A maximum size in a horizontal plane of the first through hole (219) is formed smaller than a maximum outer diameter of the pin (213);
The sliding vane control structure according to claim 2 , wherein: The maximum size in the horizontal plane of the first through hole (219) is formed smaller than the maximum size in the horizontal plane of the concave groove (2131).
The sliding vane control structure according to claim 2 , wherein: The sealing partition plate (218) a second through-hole (220) is provided, by the second through hole (220), the suction hole (216) of said low pressure passage (215) is variable volume cylinder (203) Can communicate with the
The sliding vane control structure according to claim 2 , wherein: Sliding vane control structure according to any one of claims 1 to 5 is provided, a variable volume cylinder, characterized in that. The variable capacity compressor according to claim 6 , wherein the variable capacity cylinder is provided.

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