CN216714700U - Scroll compressor crankshaft, scroll compressor and thermoregulation device - Google Patents

Abstract

The utility model discloses a scroll compressor crankshaft, a scroll compressor and a temperature adjusting device, comprising: the crankshaft body comprises a main shaft part and an eccentric part, and an oil hole is formed in the crankshaft body and extends from the main shaft part to the eccentric part; the balance block is connected with the crankshaft body, the balance block is opposite to the eccentric part, a backpressure cavity via hole communicated with the oil hole is formed in the balance block, and a valve core component is arranged in the backpressure cavity via hole; when the crankshaft rotates, the valve core component rotates along with the crankshaft and moves centrifugally along the through hole of the backpressure cavity to block the through hole of the backpressure cavity; when the crankshaft stops rotating, the valve core component can move centripetally along the conducting hole of the backpressure cavity under the action of differential pressure on two sides to conduct the conducting hole of the backpressure cavity. The rotary compressor has a simple structure, ingeniously utilizes the rotary motion of the crankshaft, can realize the functions of closing the back pressure cavity when the scroll compressor operates and communicating the back pressure cavity with the low-pressure air suction cavity when the scroll compressor is stopped, and therefore, the pressure of the back pressure cavity is quickly released after the scroll compressor is stopped.

Description

Scroll compressor crankshaft, scroll compressor and thermoregulation device

Technical Field

The utility model is used in the field of compressors, and particularly relates to a scroll compressor crankshaft, a scroll compressor and temperature regulating equipment.

Background

The scroll compressor is a positive displacement compressor, the compression component is composed of a movable scroll and a fixed scroll, and the relative revolution motion of the movable scroll and the fixed scroll is utilized to form the continuous change of the enclosed volume in the compression process, thereby realizing the purpose of compressing gas. Because the closed cavity formed when the movable and fixed scroll disks are engaged has a certain gas pressure, the movable scroll disk can bear an axial gas force opposite to the direction of the fixed scroll disk when in compression. In order to prolong the service life of the bearing, reduce the damage of the axial force to the bearing in high-speed operation and reduce the problems of abrasion of a scroll and leakage in a compression chamber caused by unbalance of the axial force, the structural design which can balance the axial gas force of the movable disc is particularly necessary. Therefore, most of the existing scroll compressors adopt a back pressure chamber structure, components such as a mounting frame and a shaft seal are arranged on the back surface of a movable scroll plate, a closed chamber is formed on the back surface of the movable scroll plate, and an intermediate pressure refrigerant between suction pressure and exhaust pressure is introduced into the closed chamber.

After the scroll compressor adopts the back pressure cavity structure, the problem that the compressor is difficult to restart within a short time after being stopped is caused. The specific reason is that the back pressure cavity adopts a closed structure after the compressor is stopped, the pressure in the back pressure cavity cannot be timely released, and the pressure in the vortex plate is reduced, so that the axial gas force in the compression cavity and the back pressure of the back pressure cavity which are originally kept balanced during operation of the vortex plate are caused to be moved, the pressure of the back pressure cavity to the movable plate after the compressor is stopped is greater than the pressure of the compression cavity to the movable plate, and the mutual contact and compression state of the tooth top surface and the tooth bottom surface of the vortex plate is caused. When the compressor is started again, the friction resistance generated by the part increases the starting torque required by the compressor, and when the motor does not reach the starting torque enough, the compressor generates the phenomena of overcurrent and incapability of starting.

In order to solve the above problems in the prior art, normally, the shutdown pressure relief function is realized by additionally installing valve body assemblies such as an electromagnetic valve, but the valve body assemblies such as the electromagnetic valve have complex structures, high cost and difficult installation, a circuit needs to be additionally arranged in the compressor, and the reliability of the compressor is greatly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to at least solve one of the technical problems in the prior art, and provides a scroll compressor crankshaft, a scroll compressor and temperature regulating equipment.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a scroll compressor crankshaft, comprising:

the crankshaft body comprises a main shaft part and an eccentric part, and an oil hole is formed in the crankshaft body and extends from the main shaft part to the eccentric part;

the balance block is connected with the crankshaft body, the balance block is opposite to the eccentric part, a backpressure cavity conducting hole communicated with the oil hole is formed in the balance block, and a valve core part is arranged in the backpressure cavity conducting hole;

when the crankshaft rotates, the valve core component rotates along with the crankshaft and moves centrifugally along the back pressure cavity conducting hole to block the back pressure cavity conducting hole; when the crankshaft stops rotating, the valve core component can move centripetally along the conducting hole of the back pressure cavity under the action of differential pressure on two sides to conduct the conducting hole of the back pressure cavity.

With reference to the first aspect, in certain implementations of the first aspect, the balance weight and the crankshaft body are separately disposed, the balance weight is provided with an assembly hole, the crankshaft body is inserted into the assembly hole and forms an integral assembly with the balance weight, the back pressure cavity via hole extends to an inner wall of the assembly hole, and the crankshaft body is provided with a transition hole communicating the back pressure cavity via hole and the oil hole.

With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the backpressure cavity via hole includes a first-step hole and a second-step hole, the second-step hole is connected between the first-step hole and the transition hole, a hole diameter of the first-step hole is smaller than a hole diameter of the second-step hole, and the valve core component is disposed in the second-step hole and can reciprocate along the second-step hole.

With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the second-step hole extends from an inner wall of the assembly hole to an outer edge of the weight along a radial direction of the weight, and the first-step hole extends from the second-step hole to a top end surface of the weight along an axial direction.

With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the hole wall of the second-step hole is provided with a gas passing groove.

With reference to the first aspect and the foregoing implementations, in certain implementations of the first aspect, a stepped surface that limits a stroke of the valve core member is formed between the transition hole and the second-step hole.

With reference to the first aspect and the implementations described above, in certain implementations of the first aspect, the spool component includes a valve ball.

With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, a mutually matched tooth groove structure is provided between the balance weight and the crankshaft body.

In a second aspect, a scroll compressor comprises a scroll compressor crankshaft as described in any implementation form of the first aspect.

In a third aspect, a temperature conditioning device comprises the scroll compressor of any one of the implementations of the second aspect.

One of the above technical solutions has at least one of the following advantages or beneficial effects: be equipped with backpressure chamber conducting hole and case part in the balancing piece, when scroll compressor operation, the case part rotates along with the bent axle to along backpressure chamber conducting hole centrifugal motion in order to plug up backpressure chamber conducting hole, produce the backpressure in the backpressure chamber of the dorsal part of the vortex dish of moving of assurance scroll compressor, to moving the vortex dish and produce an axial thrust towards deciding the vortex dish, with this to balance the axial gas force that produces by the compression chamber. After the compressor is shut down, due to the pressure difference between the back pressure cavity and the low pressure cavity of the compressor, the valve core component moves centripetally along the conducting hole of the back pressure cavity under the action of the pressure difference between two sides to conduct the conducting hole of the back pressure cavity, and the pressure in the back pressure cavity is released. According to the technical scheme, the rotary motion of the crankshaft is ingeniously utilized, the back pressure cavity can be closed when the scroll compressor operates, the back pressure cavity and the low-pressure air suction cavity are communicated when the scroll compressor is stopped, and therefore the pressure of the back pressure cavity is quickly released after the scroll compressor is stopped. For valve body subassemblies such as solenoid valve, this technical scheme simple structure has promoted the reliability of compressor.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of an embodiment of a scroll compressor crankshaft of the present invention;

FIG. 2 is a schematic view of one embodiment of a counterweight shown in FIG. 1;

FIG. 3 is a schematic illustration of a spool member position during rotation of the crankshaft of the embodiment shown in FIG. 1;

FIG. 4 is a schematic illustration of a spool member position at crankshaft stop for the embodiment of FIG. 1;

FIG. 5 is a schematic view of the scroll compressor of one embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the utility model, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there is description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.

Referring to fig. 5, an embodiment of the present invention provides a scroll compression including a housing 1, a fixed scroll 2, a movable scroll 3, a frame 4, a crankshaft 5, a stator 6, a rotor 7, and a lower frame 8. Decide the vortex dish 2 fixed mounting inside casing 1, decide the vortex dish 2 and be equipped with exhaust valve piece subassembly 9. The crankshaft 5 is supported by the frame 4 and the lower frame 8, the movable scroll 3 is connected with the crankshaft 5 through a shaft sleeve in a matching way, and the crankshaft 5 drives the movable scroll 3 to make relative revolution movement under the driving of the stator 6 and the rotor 7 to form continuous change of closed volume, thereby realizing the purpose of compressing gas. A back pressure cavity is formed between the back surface of the movable scroll 3 and the frame 4, and generates an axial thrust towards the fixed scroll to the movable scroll, so as to balance the axial gas force generated by the compression cavity.

Referring to fig. 1, 3 and 4, the embodiment of the utility model further provides a scroll compressor crankshaft, which comprises a crankshaft body 51 and a balance block 52, wherein the crankshaft body 51 comprises a main shaft part 511 and an eccentric part 512, the main shaft part 511 is used for being connected with a rotor 7 of a motor, and the eccentric part 512 is used for being connected with a movable scroll 3 of the scroll compressor. An oil hole 513 is formed in the crankshaft body 51, and the oil hole 513 extends from the main shaft portion 511 to the eccentric portion 512 and is used for pumping lubricating oil at the bottom of the scroll compressor to a friction pair at the top of the crankshaft along the crankshaft.

The balancer 52 is connected to the crankshaft main body 51, and the balancer 52 faces the eccentric portion 512. The balance weight 52 is provided inside with a back pressure chamber via hole 53 communicating with the oil hole 513, and the pressure of the back pressure chamber on the back side of the scroll compressor orbiting scroll 3 can be released by means of the back pressure chamber via hole 53 and the oil hole 513. The back pressure chamber through hole 53 is internally provided with a valve core component 54, and the valve core component 54 is used for controlling the on-off of the back pressure chamber through hole 53.

When the crankshaft 5 rotates, the valve core part 54 rotates together with the crankshaft 5 and moves centrifugally along the back pressure cavity via hole 53 to block the back pressure cavity via hole 53; when the crankshaft 5 stops rotating, the valve core part 54 can centripetally move along the back pressure cavity leading hole 53 under the action of the pressure difference of two sides to lead the back pressure cavity leading hole 53.

Referring to fig. 3, 4 and 5, a back pressure chamber through hole 53 and a valve core member 54 are provided in the balance weight 52, and when the scroll compressor is in operation, the valve core member 54 rotates with the crankshaft 5 and moves eccentrically along the back pressure chamber through hole 53 to block the back pressure chamber through hole 53, so as to ensure that a back pressure is generated in the back pressure chamber on the back side of the movable scroll plate of the scroll compressor, and an axial thrust toward the fixed scroll plate is generated on the movable scroll plate, thereby balancing the axial gas force generated by the compression chamber. After the compressor is stopped, due to the pressure difference between the back pressure cavity and the low pressure cavity of the compressor, the valve core component 54 moves centripetally along the through hole 53 of the back pressure cavity under the action of the pressure difference of two sides to conduct the through hole 53 of the back pressure cavity, and the pressure in the back pressure cavity is released. According to the technical scheme, the rotary motion of the crankshaft is ingeniously utilized, the back pressure cavity can be closed when the scroll compressor operates, the back pressure cavity and the low-pressure air suction cavity are communicated when the scroll compressor is stopped, and therefore the pressure of the back pressure cavity is quickly released after the scroll compressor is stopped. For valve body subassemblies such as solenoid valve, this technical scheme simple structure has promoted the reliability of compressor.

The embodiment of the utility model has the advantages of simple structure, few movable parts, high reliability, low cost and convenient installation, effectively solves the problem of timely releasing the pressure of the back pressure cavity after the compressor is stopped, and greatly shortens the restarting interval time of the compressor after the compressor is stopped.

The balancer 52 and the crankshaft body 51 may be integrated or separated, for example, in some embodiments, referring to fig. 1 to 4, the balancer 52 and the crankshaft body 51 are separately disposed, the balancer 52 is provided with an assembly hole 521, the crankshaft body 51 is inserted into the assembly hole 521, and forms an integrated assembly with the balancer 52 by interference fit, welding, and the like. The back pressure chamber via hole 53 extends to the inner wall of the assembly hole 521, and the crankshaft body 51 is provided with a transition hole 514 communicating the back pressure chamber via hole 53 and the oil hole 513. In the embodiment, the balance weight 52 and the crankshaft body 51 adopt a split structure, so that the valve core part 54 is convenient to assemble in the through hole 53 of the back pressure cavity.

Wherein, in order to guarantee that balancing piece 52 and crankshaft body 51 can accurate adaptation, avoid balancing piece 52 and eccentric portion 512 to produce the off-set, be equipped with the tooth's socket structure of mutual matching between balancing piece 52 and the crankshaft body 51.

In some embodiments, referring to fig. 3 and 4, the back pressure chamber leading hole 53 includes a first-step hole 531 and a second-step hole 532, the second-step hole 532 is connected between the first-step hole 531 and the transition hole 514, the first-step hole 531 has a smaller hole diameter than the second-step hole 532, and the spool member 54 is disposed in the second-step hole 532 and is capable of reciprocating along the second-step hole 532. When the crankshaft rotates, the valve core component 54 rotates together with the crankshaft and moves centrifugally along the second-order hole 532, and when the valve core component moves to the transition position of the first-order hole 531 and the second-order hole 532, the first-order hole 531 is blocked, and the blocking function of the through hole 53 of the back pressure cavity is realized. When the crankshaft stops rotating, the valve core component 54 can move centripetally along the second-order hole 532 under the action of differential pressure on two sides, is far away from the first-order hole 531, and is communicated with the conducting hole 53 of the back pressure cavity. In this embodiment, the communication hole 53 of the back pressure chamber adopts a combination of the first-order hole 531 and the second-order hole 532, so that the communication function is realized by matching with the valve core component 54, and the difficulty in manufacturing the communication hole 53 of the back pressure chamber is greatly reduced.

Further, the opening force of the spool member 54 depends on the position of the spool member 54 on the weight 52, in addition to the rotational speed of the crankshaft. To boost the working pressure in the back pressure chamber, the spool member 54 is required to be able to provide a greater opening force. Referring to fig. 3 and 4, the second-step hole 532 extends from the inner wall of the mounting hole 521 to the outer edge of the counterweight 52 in the radial direction of the counterweight 52, and the first-step hole 531 extends from the second-step hole 532 to the top end surface of the counterweight 52 in the axial direction. In this embodiment, by extending the secondary hole 532 to the outer edge of the balance weight 52, the radius of rotation of the spool member 54 when blocking the back pressure chamber through hole 53 is increased as much as possible, thereby providing a greater back pressure chamber working pressure to the orbiting scroll.

In some embodiments, the valve core member 54 is in clearance fit with the second-step hole 532, and in order to improve the pressure relief capacity of the second-step hole 532, referring to fig. 3 and 4, the hole wall of the second-step hole 532 is provided with an air passing groove 533.

In order to limit the stroke of the centripetal movement of the spool member 54, referring to fig. 3, a step surface for limiting the stroke of the spool member 54 is formed between the transition hole 514 and the second-order hole 532, and the step surface can be formed by staggering the transition hole 514 and the second-order hole 532 or making the transition hole 514 and the second-order hole 532 have different hole diameters.

It will be appreciated that the back pressure chamber through bore 53 may also be a tapered bore to provide an on/off function during reciprocation of the spool member 54.

The valve core 54 may be a slide block or a roller, for example, in the embodiment shown in fig. 3, the valve core 54 includes a valve ball, and the valve ball can roll in the through hole 53 of the back pressure chamber, so that the abrasion and the movement resistance are reduced, and the stability is improved.

The embodiment of the utility model also discloses temperature regulating equipment, which comprises the scroll compressor in any one of the above embodiments. The temperature adjusting equipment comprises heat pump temperature adjusting equipment such as a refrigerator and an air conditioner.

In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., 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 utility model. In this specification, the schematic representations of the terms used above do not necessarily 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.

The utility model is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the utility model, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.

Claims (10)

1. A scroll compressor crankshaft, comprising:

the crankshaft body comprises a main shaft part and an eccentric part, and an oil hole is formed in the crankshaft body and extends from the main shaft part to the eccentric part;

the balance block is connected with the crankshaft body, is opposite to the eccentric part, is internally provided with a backpressure cavity conducting hole communicated with the oil hole, and is internally provided with a valve core component;

when the crankshaft rotates, the valve core component rotates along with the crankshaft and moves centrifugally along the back pressure cavity conducting hole to block the back pressure cavity conducting hole; when the crankshaft stops rotating, the valve core component can move centripetally along the conducting hole of the back pressure cavity under the action of differential pressure on two sides to conduct the conducting hole of the back pressure cavity.

2. The scroll compressor crankshaft of claim 1, wherein the balance weight is provided separately from the crankshaft body, the balance weight is provided with a fitting hole, the crankshaft body is inserted into the fitting hole and forms an integral assembly with the balance weight, the back pressure cavity via hole extends to an inner wall of the fitting hole, and the crankshaft body is provided with a transition hole communicating the back pressure cavity via hole and the oil hole.

3. The scroll compressor crankshaft of claim 2, wherein the back pressure chamber conduction hole comprises a first step hole and a second step hole, the second step hole is connected between the first step hole and the transition hole, the first step hole has a smaller bore diameter than the second step hole, and the spool member is disposed in the second step hole and is capable of reciprocating along the second step hole.

4. The scroll compressor crankshaft of claim 3, wherein the secondary bore extends from an inner wall of the assembly bore radially of the counterweight to an outer edge of the counterweight, and the primary bore extends axially from the secondary bore to a top end surface of the counterweight.

5. The scroll compressor crankshaft of claim 4, wherein a bore wall of the secondary bore is provided with a gas passing groove.

6. The scroll compressor crankshaft of claim 3, wherein a step surface is formed between the transition bore and the secondary bore that limits travel of the spool component.

7. The scroll compressor crankshaft of any of claims 1-6, wherein the spool component comprises a valve ball.

8. The scroll compressor crankshaft of claim 2, wherein a mating spline structure is provided between the counterweight and the crankshaft body.

9. A scroll compressor comprising a scroll compressor crankshaft according to any one of claims 1 to 8.

10. A temperature conditioning apparatus, comprising the scroll compressor of claim 9.

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