CN111396309A - Scroll compressor with adjustable internal compression ratio, air conditioner and control method - Google Patents

Abstract

The invention provides a scroll compressor with adjustable internal compression ratio, an air conditioner and a control method, wherein the compressor comprises: the vortex disc comprises a fixed vortex disc and a movable vortex disc, wherein a first accommodating cavity is formed in the radial center of the fixed vortex disc, and a fixed disc sliding block is arranged in the first accommodating cavity; a second accommodating cavity is formed at the radial center of the movable scroll plate, and a movable disc sliding block is arranged in the second accommodating cavity; the static disc sliding block and the movable disc sliding block can move in the axial direction, so that a compression cavity formed by the static disc sliding block, the movable disc sliding block, the static vortex disc and the movable vortex disc can be switched between a two-dimensional compression space and a three-dimensional compression space. The invention can effectively realize that the internal compression ratio can be adjusted as required, so that the internal compression ratio can be adjusted and increased or reduced according to the deviation of the actual working condition from the designed working condition, the compression loss can be effectively reduced, the energy loss caused by overlarge difference between the internal compression ratio and the external compression ratio under the limit operation working condition is solved, and the efficiency of the scroll compressor is improved.

Description

Scroll compressor with adjustable internal compression ratio, air conditioner and control method

technical field

The invention relates to the technical field of compressors, in particular to a scroll compressor with an adjustable internal compression ratio, an air conditioner and a control method.

Background technique

The conventional scroll compressor is a positive displacement compressor with a fixed internal compression ratio (ratio of pump body discharge pressure to suction pressure), and its internal compression ratio is only related to the structural parameters of the pump body, and is based on a specific operating condition. The external compression ratio of the compressor (the ratio of condensing pressure and evaporation pressure) changes with the operating conditions of the system, and is closely related to parameters such as indoor and outdoor ambient temperature.

When the actual operating condition deviates from the design condition, the internal compression ratio is inconsistent with the external compression ratio, so-called under-compression and over-compression will occur in the compressor. Efficiency drops.

At present, the typical multi-line scroll compressors on the market need to cover the operating compression ratio of 1.5 to 8.0. Generally speaking, in summer, the difference between indoor and outdoor ambient temperatures for refrigeration is small, and the compression ratio is relatively small; in winter, the indoor and outdoor ambient temperature difference for heating is relatively large, and the compression ratio is relatively large. Due to the structural limitations of conventional scroll compressors, the efficiency can only be indicated at the highest design conditions. The greater the deviation between the operating condition and the design condition, the greater the compression loss.

Patent CN1262762C - Scroll compressor with a stepped portion for reducing fluid leakage, refers to a scroll with a stepped spiral wall and an end plate respectively, that is to say, the spiral tooth height is higher than the outer side of the spiral. High and the center side lower. Such a compression structure is called three-dimensional compression, which can provide a higher internal compression ratio without increasing the diameter of the scroll, but the internal pressure ratio is still a fixed value.

Patent CN204061180U - a variable internal volume ratio scroll compressor, it is proposed that one or more auxiliary exhaust holes and pressure relief valve devices are arranged on the fixed scroll, and the pressure is automatically released through the above devices to reduce the internal pressure of the compressor. pressure ratio to prevent overcompression in the scroll compressor. This device can only solve the problem of over-compression, and the pressure relief leads to a reduction in the actual operating compression ratio of the scroll compressor. In order to meet the requirements of the compressor's operating range, the scroll must be designed for a larger compression ratio, resulting in a larger scroll diameter, which greatly increases the risk of wear and leakage. Due to the large compression ratio in the design condition, the relief valve in more operating conditions is open, and the central scroll chamber is in an ineffective no-load state.

Because the conventional scroll compressors in the prior art are designed with an internal compression ratio according to a single working condition, they cannot take into account the working conditions of large compression ratio and small compression ratio, resulting in actual operating conditions deviating from the designed working conditions, resulting in large compression losses, while air conditioners Complex and changeable working conditions have clear requirements for this; scroll compressors with pressure relief valve adjustment need to be designed according to large pressure ratio conditions, and the compressor body is large; scroll compressors with pressure relief valve adjustment, pressure relief When the valve is opened, the central scroll cavity is not effectively compressed, the friction and wear area is large, and the leakage risk is high. Therefore, the present invention researches and designs a scroll compressor, an air conditioner and a control method with an adjustable internal compression ratio.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is to overcome the defect of the scroll compressor in the prior art that the internal compression ratio is designed according to a single working condition, resulting in a large compression loss when the actual operating condition deviates from the design condition, thereby providing A scroll compressor with adjustable internal compression ratio, an air conditioner and a control method.

In order to solve the above problems, the present invention provides a scroll compressor with an adjustable internal compression ratio, which includes:

The stationary scroll and the movable scroll, the radial center of the stationary scroll is formed with a first accommodating cavity, the first accommodating cavity is provided with a stationary disk slider, and the stationary disk slider also has Scroll teeth, the scroll teeth of the stationary scroll slider are engaged with the scroll teeth of the stationary scroll, so that the scroll teeth of the stationary scroll slider are the scroll teeth of the stationary scroll helical extension in radial direction;

A second accommodating cavity is formed at the radial center position of the movable scroll, and a movable disk slider is arranged in the second accommodating cavity, and the movable disk slider also has scroll teeth. The scroll teeth of the movable scroll are engaged with the scroll teeth of the movable scroll, so that the scroll teeth of the movable scroll slider are the helical extension of the scroll teeth of the movable scroll in the radial direction;

The first accommodating chamber and the second accommodating chamber are communicated in the axial direction of the compressor, the static disk sliding block and the moving disk sliding block are connected in the axial direction, and the static disk sliding block and the moving disk sliding block are connected in the axial direction. The movable disk slider can move in the axial direction, so that the compression chamber enclosed by the stationary disk slider, the movable disk slider, the stationary scroll and the movable scroll can be compressed between two parts. Toggle between 2D compressed space and 3D compressed space.

Preferably, when the static disk slider and the movable disk slider integrally move to the top dead center of the uppermost end in the axial direction, the compression cavity is formed into the two-dimensional compression space; When the moving plate slider moves integrally along the axial direction to the bottom dead center of the lowermost end, the compression cavity is formed into the three-dimensional compression space.

Preferably, a side end face of the stationary scroll away from the movable scroll is further provided with a stationary disk cover, so that a closed volume is formed between the stationary scroll cover and the stationary scroll. The first accommodating cavity is communicated with the closed cavity, so that the end face of the static disk slider facing the static disk cover plate can withstand the pressure of the gas in the closed cavity, the The exhaust gas or suction gas of the scroll compressor can be passed into the closed cavity.

Preferably, when the air intake gas is introduced into the airtight chamber, the static disk slider and the movable disk slider are pushed by pressure and move integrally toward the direction of the static disk cover, so as to form the two-dimensional compression space; when the exhaust gas is introduced into the airtight cavity, the static disk slider and the movable disk slider are pushed by the pressure of the exhaust gas to move toward the movable scroll. The directions are integrally moved to form the three-dimensional compressed space.

Preferably, it also includes a first pipeline, one end of the first pipeline is connected to the gas in the closed cavity, and the other end is connected to the gas at the discharge end of the scroll compressor, and the first pipeline is provided with a first control valve; and also includes a second pipeline, one end of the second pipeline is connected to the air in the closed cavity, and the other end is connected to the gas at the suction end of the scroll compressor. A second control valve is provided.

Preferably, a first connection port and a second connection port are provided on the static disk cover, the first connection port can communicate the first pipeline with the airtight cavity, and the second connection port The second pipeline can be communicated with the airtight cavity; and/or, an exhaust port is also provided on the static disk cover, and the exhaust port is connected to the exhaust port on the stationary scroll. channel connection.

Preferably, an end face of the movable disk slider away from the static disk slider is subjected to an intermediate pressure, wherein the intermediate pressure is the pressure generated by the gas inside the casing of the scroll compressor, And the magnitude of the intermediate pressure>the suction pressure of the scroll compressor, and the magnitude of the intermediate pressure<the discharge pressure of the scroll compressor.

Preferably, an end face of the movable disk slider away from the static disk slider is subjected to suction pressure, wherein the suction pressure is generated by the suction of gas at the suction end of the scroll compressor The pressure on the side of the moving disk slider away from the static disk slider is also connected with an elastic structure, and the elastic structure can exert pressure on the moving disk slider toward the static disk slider. direction of elasticity.

Preferably, when the top dead center and the bottom dead center are included at the same time: the position where the upper end of the stationary disk slider is in contact with the stationary disk cover is the top dead center; the upper and lower dead centers of the movable scroll A locking structure is also arranged in the second accommodating cavity, and the locking structure can lock the lower end surface of the moving plate slider, and the lower end of the moving plate slider is locked with the locking structure. The position when the structures are in contact is the bottom dead center.

The present invention also provides an air conditioner, which includes the scroll compressor with an adjustable internal compression ratio described in any preceding item.

The present invention also provides an internal compression ratio control method applicable to the scroll compressor with adjustable internal compression ratio described in any preceding item, wherein:

When the first pipeline, the first control valve, the second pipeline and the second control valve are also included: when the first internal compression ratio compression is required, the first control valve is controlled to be closed, and the second control valve is controlled at the same time. The control valve is opened; when the second internal compression ratio compression is required, the first control valve is controlled to open and the second control valve is controlled to be closed, wherein the first internal compression ratio<the second internal compression ratio .

The scroll compressor with adjustable internal compression ratio, the air conditioner and the control method provided by the present invention have the following beneficial effects:

In the present invention, a first accommodating cavity is provided in the stationary scroll, and a stationary scroll slider is arranged therein, and the scroll teeth of the stationary scroll are connected to and extend from the scroll teeth of the stationary scroll, so that the stationary scroll can be The sliding block cooperates with the stationary scroll to form a tooth structure that cooperates with the movable scroll teeth. A second accommodating cavity is opened in the movable scroll, and the movable scroll slider is arranged therein. The scroll teeth of the movable scroll slider It is connected with and extends the scroll teeth of the movable scroll, so that the sliding block of the movable scroll and the movable scroll can cooperate to form a tooth structure that cooperates with the scroll teeth of the stationary scroll, and the sliding block of the stationary scroll and the movable scroll slide. The block can move in the axial direction, so that the shape of the compression cavity enclosed by the stationary disk slider, the movable disk slider, the stationary scroll and the movable scroll changes, and can be Switching between three-dimensional compression space and three-dimensional compression space effectively realizes that the internal compression ratio can be adjusted as needed, so that the internal compression ratio can be adjusted to increase or decrease according to the deviation of the actual working conditions from the design conditions. Effectively reduce the compression loss, solve the energy loss caused by the excessive difference between the internal and external compression ratios under extreme operating conditions, and improve the efficiency of the scroll compressor. Because three-dimensional compression is selected when the compression ratio is high, a larger internal compression ratio can be achieved with a smaller shell diameter, and the central scroll cavity can be effectively compressed, with a small friction area of the pump body and a low risk of leakage.

Description of drawings

Fig. 1 is the exploded structure diagram of the scroll compressor with adjustable internal compression ratio of the present invention;

Fig. 2 is the structure diagram of the scroll compressor with adjustable internal compression ratio of the present invention in two-dimensional compression mode;

3 is a structural diagram of the scroll compressor with an adjustable internal compression ratio of the present invention in a three-dimensional compression mode;

4 is a schematic diagram of the control structure of the main embodiment of the scroll compressor with adjustable internal compression ratio of the present invention;

FIG. 5 is a schematic diagram of the control structure of an alternative embodiment of the scroll compressor with adjustable internal compression ratio of the present invention.

Reference numerals are indicated as:

1. Static disk cover; 2. Static disk slider; 3. Static scroll; 30. First accommodating chamber; 4. Moving disk slider; 5. Moving scroll; 50. Second accommodating chamber; 101 102, the exhaust port; 103, the second connection port; 110, the first pipeline; 120, the second pipeline; 301, the suction port; 501, the moving plate bearing; 6, the airtight cavity ; 71, the first control valve; 72, the second control valve; 8, the elastic structure.

Detailed ways

As shown in Figures 1-5, the present invention provides a scroll compressor with an adjustable internal compression ratio, which includes:

The fixed scroll 3 and the movable scroll 5, the radial center of the fixed scroll 3 is formed with a first accommodating cavity 30, the first accommodating cavity 30 is provided with the stationary sliding block 2, the The stationary disk slider 2 also has scroll teeth, and the scroll teeth of the stationary disk slider 2 are engaged with the scroll teeth of the stationary scroll 3, so that the scroll teeth of the stationary disk slider 2 are The helical extension of the spiral teeth of the fixed scroll 3 in the radial direction;

A second accommodating cavity 50 is formed at the radial center position of the movable scroll 5, and a movable disk slider 4 is arranged in the second accommodating cavity 50, and the movable disk slider 4 also has scroll teeth, so The scroll teeth of the movable disk slider 4 are engaged with the scroll teeth of the movable scroll 5 , so that the scroll teeth of the movable disk slider 4 are the scroll teeth of the movable scroll 5 . helical extension in radial direction;

The first accommodating chamber 30 and the second accommodating chamber 50 communicate with each other in the axial direction of the compressor, the static disk sliding block 2 and the moving disk sliding block 4 are axially connected, and the static disk sliding block 2 and the moving disk sliding block 4 The disk slider 2 and the movable disk slider 4 can move in the axial direction, so that the stationary disk slider 2 , the movable disk slider 4 , the fixed scroll 3 and the movable scroll The compression cavity enclosed by 5 can be switched between two-dimensional compression space and three-dimensional compression space.

In the present invention, a first accommodating cavity is provided in the stationary scroll, and a stationary scroll slider is arranged therein, and the scroll teeth of the stationary scroll are connected to and extend from the scroll teeth of the stationary scroll, so that the stationary scroll can be The sliding block cooperates with the stationary scroll to form a tooth structure that cooperates with the movable scroll teeth. A second accommodating cavity is opened in the movable scroll, and the movable scroll slider is arranged therein. The scroll teeth of the movable scroll slider It is connected with and extends the scroll teeth of the movable scroll, so that the sliding block of the movable scroll and the movable scroll can cooperate to form a tooth structure that cooperates with the scroll teeth of the stationary scroll, and the sliding block of the stationary scroll and the movable scroll slide. The block can move in the axial direction, so that the shape of the compression cavity enclosed by the stationary disk slider, the movable disk slider, the stationary scroll and the movable scroll changes, and can be Switching between three-dimensional compression space and three-dimensional compression space effectively realizes that the internal compression ratio can be adjusted as needed, so that the internal compression ratio can be adjusted to increase or decrease according to the deviation of the actual working conditions from the design conditions. Effectively reduce the compression loss, solve the energy loss caused by the excessive difference between the internal and external compression ratios under extreme operating conditions, and improve the efficiency of the scroll compressor. Because three-dimensional compression is selected when the compression ratio is high, a larger internal compression ratio can be achieved under a smaller shell diameter, and the effective compression of the central scroll cavity is effectively ensured. The friction area of the pump body is small and the risk of leakage is low.

The present invention proposes a new type of scroll compressor structure, which has two operating modes, namely a two-dimensional compression mode (Fig. 2) for small compression ratio conditions and a three-dimensional compression mode (Fig. 3) for large compression ratio conditions. . According to the set working conditions, the compression ratio is solved for the demand operation, and the manual or control program automatically selects a more suitable operation mode.

In order to realize the design of two compression ratio modes in the compression chamber, the following pump body structure was invented (Fig. 1). The moving plate and the static plate are respectively divided into the slider structure of the central cavity and the outer fixed structure, and the two together constitute the completed model. Line and compression cavity; the shape features of the two sliders correspond to the tooth top and tooth bottom of the scroll gear, which can cooperate with each other and will not interfere in the three-dimensional compression mode; after installation, the two sliders are axially connected in series, and the sliding The blocks are axially movable relative to the scroll and have the same travel stroke.

The structural features of the slider of the present invention are taken as examples of the tooth top of the moving plate and the tooth bottom of the static plate, and the shape features of the two can also be interchanged.

Preferably, as shown in FIG. 2 , when the static disk slider 2 and the movable disk slider 4 move together in the axial direction to the top dead center of the uppermost end, the compression cavity is formed into the two-dimensional compression space; As shown in FIG. 3 , when the static disk slider 2 and the movable disk slider 4 move integrally along the axial direction to the bottom dead center of the lowermost end, the compression cavity is formed as the three-dimensional compression space. This is a further preferred structural form of the present invention, that is, as shown in FIG. 2 , when the stationary disk slider and the movable disk slider move together to the uppermost end, the lower end surface of the stationary disk slider and the upper surface of the inner cavity of the stationary scroll The end faces are flush, that is, the axial height of the compression cavity at the radial center portion formed by the stationary disk slider, the movable disk slider, the stationary scroll and the movable scroll is the same as the axial height of the compression chamber at the radial outer side. The heights are equal, so the compression cavity formed is a two-dimensional compression space of equal height. At this time, due to the two-dimensional compression, the internal compression ratio is smaller than that of the three-dimensional compression, and it is suitable for the design condition with a small internal compression ratio; as shown in Figure 3 It is shown that when the static disk slider and the moving disk slider move together to the lowest end, the lower end surface of the static disk slider is not flush with the upper end surface of the inner cavity of the stationary scroll, that is, the static disk slider and the moving disk slider are not flush with each other. , The axial height of the compression cavity at the radial center formed by the stationary scroll and the movable scroll is smaller than the axial height of the compression cavity at the radial outer side, so the compression cavity formed is higher in the radial outer side, For the three-dimensional compression space with a low radial inner height, at this time, due to the three-dimensional compression, the internal compression ratio is smaller than that of the two-dimensional compression, and it is suitable for the design of the large internal compression ratio.

Preferably, a side end face of the stationary scroll 3 away from the movable scroll 5 is further provided with a stationary disk cover 1 , so that the stationary scroll cover 1 and the stationary scroll 3 A sealed cavity 6 is formed therebetween, and the first accommodating cavity 30 is communicated with the sealed cavity 6, so that the end face of the static disk slider 2 facing the static disk cover 1 can withstand the sealing The pressure of the gas in the cavity 6, the exhaust gas or the suction gas of the scroll compressor can be passed into the closed cavity 6. This is a further preferred structural form of the present invention. By means of the stationary disk cover plate disposed on the upper end of the stationary scroll, a closed cavity can be effectively formed between the stationary disk cover plate and the upper end face of the stationary scroll, so that through the The airtight volume chamber can pass gas with different pressures according to the actual working conditions, so as to realize the motion control of the static disk slider and the moving disk slider, and realize the effective switching between the two-dimensional compression space and the three-dimensional compression space.

Preferably, when the airtight chamber 6 passes into the suction gas, the static disk slider 2 and the moving disk slider 4 are pushed by the pressure and move integrally toward the direction of the static disk cover 1 , to form the two-dimensional compression space; when the airtight cavity 6 is passed into the exhaust gas, the static disk slider 2 and the moving disk slider 4 are pushed by the pressure of the exhaust gas toward the The direction of the movable scroll 5 moves integrally to form the three-dimensional compression space. This is the preferred structural form for introducing gases of different pressures into the airtight chamber of the present invention. When a smaller internal compression ratio needs to be achieved, a suction gas with a lower pressure is introduced into the airtight chamber, thereby making the static disk slider The slider and the moving plate are pushed upward by the pressure at the lower end (the pressure at the lower end is greater than the pressure at the upper end to form a pressure difference), thereby forming a two-dimensional compression space to achieve compression with a smaller internal pressure ratio; The exhaust gas with high pressure is introduced into the closed cavity, so that the static disk slider and the movable disk slider are pushed down by the pressure at the upper end (the pressure at the upper end is greater than the pressure at the lower end to form a pressure difference), thereby forming a two-dimensional compression space. Compression to achieve a larger internal pressure ratio.

Preferably, it also includes a first pipeline 110, one end of the first pipeline 110 is connected to the airtight chamber 6, and the other end is connected to the gas at the discharge end of the scroll compressor. A first control valve 71 is provided on the pipeline 110; it also includes a second pipeline 120, one end of the second pipeline 120 is connected to the airtight chamber 6, and the other end is connected to the suction of the scroll compressor A second control valve 72 is provided on the second pipeline 120 . This is a further intelligent control structure form of the present invention. Through the arrangement of two different pipelines and different ways of connecting suction gas or exhaust gas, gas of different pressures can be introduced into the closed cavity, so as to realize The driving effect of the slider of the static disk and the slider of the moving disk can realize the switching effect of different internal compression ratios.

Preferably, the static disk cover 1 is provided with a first connection port 101 and a second connection port 103 , and the first connection port 101 can communicate the first pipeline 110 with the airtight chamber 6 , The second connection port 103 can communicate the second pipeline 120 with the airtight chamber 6; and/or, the static disk cover 1 is further provided with an exhaust port 102, the exhaust port 102 communicates with the exhaust passage on the fixed scroll 3 . Through two different connection ports on the cover plate of the static disk, the gases of different pressures can be connected into the airtight chamber, and the exhaust port is used to discharge the high-pressure exhaust gas in the compression chamber.

As shown in FIG. 4 , preferably, the end face of the movable disk slider 4 away from the static disk slider 2 is subjected to an intermediate pressure, wherein the intermediate pressure is caused by the casing of the scroll compressor. The pressure generated by the gas inside the body, and the magnitude of the intermediate pressure>the suction pressure of the scroll compressor, and the magnitude of the intermediate pressure<the discharge pressure of the scroll compressor. This is the structural form of the main embodiment when the present invention includes the control structure, that is, the upper end of the static disk slider is fed with suction pressure or exhaust pressure, and the lower end of the movable disk slide is controlled by passing the intermediate pressure For example, if the exhaust pressure is passed into the closed cavity, since the exhaust pressure is greater than the intermediate pressure at the lower end, the static plate slider and the movable plate slider are driven downward by the pressure difference. movement to form a three-dimensional compression mode; if the suction pressure is introduced into the closed cavity, since the suction pressure is less than the intermediate pressure at the lower end, the static disk slider and the moving disk slider are driven by the pressure difference to move upward to form a two-dimensional Compression mode, effectively realize the switching of internal compression ratio.

As shown in FIG. 5 , preferably, the end face of the moving disk slider 4 away from the static disk slider 2 is subjected to suction pressure, wherein the suction pressure is the suction pressure of the scroll compressor. The pressure generated by the inhalation of gas at the gas end, and the end face of the moving disk slider 4 away from the static disk slider 2 is also connected with an elastic structure 8, and the elastic structure 8 can be used for the moving disk. The slider 4 exerts an elastic force in the direction of the static disk slider 2 . This is the structural form of the alternative embodiment of the present invention. Since the lower end is the suction pressure, the elastic force is generated by increasing the elastic structure, so that the sum of the elastic force and the suction pressure is located between the suction pressure and the discharge pressure, and the elastic structure A spring is preferred, that is, the upper end of the static disc slider is fed with suction pressure or exhaust pressure, and the lower end of the moving disc slide is fed with suction pressure + elastic force to achieve the purpose of controlling the up and down movement of the static disc slide and the moving disc slide. For example, if the exhaust pressure is passed into the closed cavity, since the exhaust pressure is greater than the suction pressure + elastic force at the lower end, the static disk slider and the moving disk slider are driven to move downward by the pressure difference, forming a three-dimensional compression. Mode; if the suction pressure is introduced into the closed cavity, since the suction pressure is less than the suction pressure + elastic force at the lower end, the static disk slider and the moving disk slider are driven by the pressure difference to move upward to form a two-dimensional compression mode, which effectively realizes the switching of the internal compression ratio.

Preferably, when both the top dead center and the bottom dead center are included: the position where the upper end of the stationary disk slider 2 abuts against the stationary disk cover plate 1 is the top dead center; the movable scroll 5. A locking structure (not shown) is also provided on the top, preferably in the second accommodating cavity 50, and the locking structure can lock the lower end surface of the moving plate slider 4, and the moving plate The position where the lower end of the disk slider 4 is in contact with the locking structure is the bottom dead center. This is the effective realization structure form of the top dead center and the bottom dead center of the present invention. The top dead center is realized by the static disk cover plate, effectively realizing the limit of the upper limit position of the motion of the static disk slider, and the bottom dead center is locked by locking The structure to realize and effectively realize the limit of the lower limit position of the static disk slider movement.

The present invention also provides an air conditioner, which includes the scroll compressor with an adjustable internal compression ratio described in any preceding item.

The present invention also provides an internal compression ratio control method applicable to the scroll compressor with adjustable internal compression ratio described in any preceding item, wherein:

When the first pipeline 110, the first control valve 71, the second pipeline 120 and the second control valve 72 are also included: when the first internal compression ratio compression is required, the first control valve 71 is controlled to be closed, while The second control valve 72 is controlled to open; when the second internal compression ratio compression is required, the first control valve 71 is controlled to open, and the second control valve 72 is controlled to be closed, wherein the first internal compression ratio <The second internal compression ratio.

This is the preferred control method for switching the internal compression ratio of the present invention, that is, introducing the exhaust pressure to push down the slider of the static disk and the slider of the moving disk to realize the compression mode of the three-dimensional compression space, and introducing the suction pressure to push the static disk The slider and the slider of the moving plate are pushed upward to realize the compression mode of two-dimensional compressed space.

The method of using the gas pressure difference to switch according to the main embodiment of the present invention (FIG. 4), the control method is as follows:

The pressure on the back of the moving plate is always an intermediate pressure, and the cover plate of the static plate forms a variable pressure chamber structure on the back of the static plate, and the pressure chamber is communicated with either suction or exhaust according to requirements. The static disk cover plate has an upper limit surface structure, and the crank part of the movable disk has a lower limit surface structure.

As shown in the figure, when SV1 (the first control valve 71) is closed and SV2 (the second control valve 72) is opened, the pressure chamber at the back of the static disk is connected to the suction, and the two axially connected central chamber sliders act on the pressure difference. Move down to the side of the static disc, when it reaches the axial upper limit surface, the compressor is in a two-dimensional compression mode; when SV1 is turned on and SV2 is turned off, the pressure chamber on the back of the static disc is connected to the exhaust gas, and the two axially connected central chambers are connected in series. The slider moves to the moving plate side under the action of the pressure difference, and when it reaches the axial lower limit surface, the compressor is in the three-dimensional compression mode.

Therefore, switching between different operating modes can be achieved by controlling the pressure state of the pressure chamber at the back of the static disk.

The control method of the alternative embodiment of the present invention, that is, the method of switching the combination of gas pressure difference and spring (FIG. 5), the control method is as follows:

Compared with the main embodiment, the pressure on the back of the moving plate is formed by the suction pressure, a spring structure is arranged between the slider of the moving plate and the lower limit surface, and the setting method of the pressure chamber on the back of the static plate is the same as that in the main embodiment.

As shown in the figure, when SV1 (the first control valve 71) is closed and SV2 (the second control valve 72) is opened, the pressure chamber on the back of the static disk is connected with the suction, and the pressure on both sides of the two axially connected central chamber sliders The differential force is less than the force of the spring, the spring bounces, and the slider moves to the side of the static disk. When it reaches the axial upper limit surface, the compressor is in two-dimensional compression mode; when SV1 is opened and SV2 is closed, the pressure chamber on the back of the static disk Connected with the exhaust, the pressure difference between the two sides of the two axially connected central cavity sliders is greater than the force of the spring, the springs are compressed, and the sliders move to the moving plate side. When the axial lower limit surface is reached, the compressor is in 3D compression mode.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range. The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (11)

1. a scroll compressor with an adjustable internal compression ratio, characterized in that: comprising: a fixed scroll (3) and a movable scroll (5), a first accommodation cavity (30) is formed at the radial center position of the stationary scroll (3), and the first accommodation cavity (30) A stationary disk slider (2) is provided, the stationary disk slider (2) also has scroll teeth, the scroll teeth of the stationary disk slider (2) and the scroll teeth of the stationary scroll (3) The wraps are engaged so that the wraps of the stationary scroll slider (2) are helical extensions of the wraps of the stationary scroll (3) in the radial direction; A second accommodating cavity (50) is formed at the radial center position of the movable scroll (5), and a movable disk slider (4) is arranged in the second accommodating cavity (50), and the movable disk slider (4) It also has scroll teeth, and the scroll teeth of the movable plate slider (4) are engaged with the scroll teeth of the movable scroll (5), so that the scroll teeth of the movable plate slider (4) are The scroll teeth are the helical extension of the scroll teeth of the movable scroll (5) in the radial direction; The first accommodating cavity (30) and the second accommodating cavity (50) are communicated in the axial direction of the compressor, and the static disk sliding block (2) and the moving disk sliding block (4) are in the axial direction of the compressor. are connected to the top, and the static disk slider (2) and the moving disk slider (4) can move in the axial direction, so that the static disk slider (2), the moving disk slider (4) ), the compression cavity enclosed by the fixed scroll (3) and the movable scroll (5) can be switched between a two-dimensional compression space and a three-dimensional compression space. 2. The scroll compressor with an adjustable internal compression ratio according to claim 1, wherein: When the static disk slider (2) and the movable disk slider (4) move integrally in the axial direction to the top dead center of the uppermost end, the compression cavity is formed into the two-dimensional compression space; the static disk slides When the block (2) and the moving plate slider (4) move integrally along the axial direction to the bottom dead center of the lowermost end, the compression cavity is formed into the three-dimensional compression space. 3. The scroll compressor with adjustable internal compression ratio according to claim 1 or 2, characterized in that: The end face of the stationary scroll (3) on the side away from the movable scroll (5) is further provided with a stationary cover plate (1), so that the stationary scroll cover (1) and the A closed cavity (6) is formed between the stationary scrolls (3), and the first accommodation cavity (30) is communicated with the closed cavity (6), so that the stationary disk slider (2) is The end face facing the static disk cover plate (1) can withstand the pressure of the gas in the airtight chamber (6), and the airtight chamber (6) can pass the exhaust gas of the scroll compressor or inhale gas. 4. The scroll compressor with an adjustable internal compression ratio according to claim 3, wherein: When the air intake gas is introduced into the airtight chamber (6), the static disk sliding block (2) and the moving disk sliding block (4) are pushed by pressure and move toward the static disk cover plate (1) The two-dimensional compression space is formed by integral movement in the direction of the two-dimensional compression space; when the exhaust gas is introduced into the airtight chamber (6), the static disk slider (2) and the movable disk slider (4) Pushed by the pressure of the exhaust gas to move integrally in the direction of the movable scroll (5) to form the three-dimensional compression space. 5. The scroll compressor with adjustable internal compression ratio according to claim 3 or 4, characterized in that: Also includes a first pipeline (110), one end of the first pipeline (110) is connected to the airtight chamber (6), the other end is connected to the gas at the discharge end of the scroll compressor, the The first pipeline (110) is provided with a first control valve (71); it also includes a second pipeline (120), one end of the second pipeline (120) is communicated with the closed cavity (6) and the other end is connected to the gas at the suction end of the scroll compressor, and the second pipeline (120) is provided with a second control valve (72). 6. The scroll compressor with an adjustable internal compression ratio according to claim 5, wherein: The static disk cover plate (1) is provided with a first connection port (101) and a second connection port (103), and the first connection port (101) can connect the first pipeline (110) with all the The airtight chamber (6) is communicated, and the second connection port (103) can communicate the second pipeline (120) with the airtight chamber (6); and/or, the static disk cover plate (1) is also provided with an exhaust port (102), and the exhaust port (102) communicates with the exhaust passage on the stationary scroll (3). 7. The scroll compressor with adjustable internal compression ratio according to claim 3, characterized in that: The end face of the moving disk slider (4) away from the static disk slider (2) is subjected to an intermediate pressure, wherein the intermediate pressure is generated by the gas inside the casing of the scroll compressor and the magnitude of the intermediate pressure > the suction pressure of the scroll compressor, and the magnitude of the intermediate pressure < the discharge pressure of the scroll compressor. 8. The scroll compressor with an adjustable internal compression ratio according to claim 3, wherein: The end face of the moving disk slider (4) away from the static disk slider (2) is subjected to suction pressure, wherein the suction pressure is drawn from the suction end of the scroll compressor. The pressure generated by the gas, and the end face of the moving disk slider (4) away from the static disk slider (2) is also connected with an elastic structure (8), the elastic structure (8) can be An elastic force in the direction of the static disk slider (2) is applied to the moving disk slider (4). 9. The scroll compressor with an adjustable internal compression ratio according to claim 3, wherein: When both the top dead center and the bottom dead center are included: the position when the upper end of the static disk slider (2) abuts against the static disk cover plate (1) is the top dead center; the movable scroll A locking structure is also provided on the disk (5) and located in the second accommodating cavity (50), and the locking structure can lock the lower end surface of the moving disk slider (4), and the locking structure is The position when the lower end of the moving plate slider (4) is in contact with the locking structure is the bottom dead center. 10. An air conditioner, characterized by comprising the scroll compressor with an adjustable internal compression ratio according to any one of claims 1-9. 11. An internal compression ratio control method applicable to the scroll compressor with adjustable internal compression ratio according to any one of claims 1-9, characterized in that: When the first pipeline (110), the first control valve (71), the second pipeline (120) and the second control valve (72) are also included: when the first internal compression ratio compression is required, control the The first control valve (71) is closed and the second control valve (72) is controlled to open at the same time; when the second internal compression ratio compression is required, the first control valve (71) is controlled to open and the first control valve (71) is controlled to be opened at the same time. The second control valve (72) is closed, wherein the first internal compression ratio < the second internal compression ratio.

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