A displacement self-regulating compressor and a refrigerator including the same

Abstract

The present invention provides a displacement self-regulating compressor and a refrigerator including the same. The displacement self-regulating compressor includes: a cylinder seat, a double-layer cylinder is arranged on the cylinder seat, the double-layer cylinder includes an inner cylinder hole and an outer cylinder hole, wherein the inner cylinder hole is a circular hole, and the inner cylinder hole and the outer cylinder hole can be connected through a connecting hole; a sliding hole is arranged between the inner cylinder hole and the outer cylinder hole, the sliding hole passes through along the axial direction of the double-layer cylinder, the connecting hole is connected to the sliding hole, and a vent hole connected to the sliding hole is arranged on the side wall of the outer cylinder hole; a slider assembly includes a slider and an elastic member, the slider and the elastic member are arranged in the sliding hole, the slider moves in the sliding hole under the action of the elastic member and the gas pressure at both ends of the sliding hole, and blocks the connecting hole or the vent hole by moving; a piston includes an inner plug body and an outer plug body, the inner plug body and the outer plug body are an integrated structure, the inner plug body can be slidably arranged in the inner cylinder hole, and the outer plug body can be slidably arranged in the outer cylinder hole. The present invention can realize the self-regulation of the compressor displacement and realize low-energy operation.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a displacement self-regulating compressor and a refrigerator comprising the same. Background Art

[0002] According to the characteristics of refrigerator-compressor matching, the refrigerator's refrigeration capacity requirements are different under different ambient temperature conditions, and the differences are very large; for example, in the refrigerator energy consumption test experiment, the refrigerator body under the high ambient temperature of 32°C requires about twice the refrigeration capacity under the low ambient temperature of 16°C. This means that the refrigerator compressor is expected to output different cooling capacity under different ambient temperature conditions to adapt to the requirements of the refrigerator, so as to achieve energy saving requirements. On the other hand, the refrigerator compartment needs precise temperature control to improve the moisture retention and freshness of food, and also requires the refrigerator-compressor cooling capacity matching to be more accurate and without large fluctuations. Therefore, compressors that output variable cooling capacity are an important guarantee for energy saving and food preservation in future refrigerators and freezers.

[0003] At present, in the refrigerator compressor industry, reciprocating variable frequency compressors that control the compressor speed are the mainstream products for variable cooling capacity. Compared with the original fixed frequency compressor, the variable frequency compressor can control the speed of the refrigerator compressor to output different cooling capacity according to the different climate and ambient temperatures of the refrigerator, so that the refrigerator heat load-compressor cooling capacity output is in a better matching state. However, since the variable frequency compressor requires an additional variable frequency control board to control the operation of the compressor, the cost of the compressor has increased a lot; and there are many electronic components on the variable frequency board, which may reduce the overall reliability of the compressor.

[0004] In the prior art, some compressors adjust the effective volume of the compressor by setting a variable capacity device, thereby adjusting the cooling capacity. However, this solution requires a more complex electrical control structure, which is complex and will also affect the reliability of the compressor. Summary of the invention

[0005] In view of this, the present invention provides a displacement self-regulating compressor and a refrigerator including the same, which are used to at least solve the technical problem of inconvenient adjustment of the compressor cooling output in the prior art, specifically:

[0006] In a first aspect, the present invention provides a displacement self-regulating compressor, comprising:

[0007] A cylinder seat, wherein a double-layer cylinder is arranged on the cylinder seat, and the double-layer cylinder comprises an inner cylinder hole and an outer cylinder hole, wherein the inner cylinder hole is a circular hole, and the outer cylinder hole is an annular cavity formed around the inner cylinder hole, and the inner cylinder hole and the outer cylinder hole can be connected through a connecting hole;

[0008] The double-layer cylinder is provided with a sliding hole between the inner cylinder hole and the outer cylinder hole, the sliding hole penetrates along the axial direction of the double-layer cylinder, the communicating hole is communicated with the sliding hole, and the side wall of the outer cylinder hole is provided with an air leakage hole communicated with the sliding hole;

[0009] A slider assembly, comprising a slider and an elastic member, wherein the slider and the elastic member are arranged in the sliding hole, and the slider moves in the sliding hole under the action of the elastic member and the gas pressure at both ends of the sliding hole, and blocks the connecting hole or the air leakage hole by moving;

[0010] The piston comprises an inner plug body and an outer plug body, wherein the inner plug body and the outer plug body are fixed together or are an integral structure, the inner plug body can be slidably arranged in the inner cylinder hole, and the outer plug body can be slidably arranged in the outer cylinder hole.

[0011] Further optionally, the outer cylinder hole is an annular cavity with one end open and the other end closed, and the connecting hole and the air leakage hole are located near the closed end of the outer cylinder hole, wherein the connecting hole is located between the closed end and the air leakage hole.

[0012] Further optionally, the inner plug body is a cylindrical structure with one end open and the other end closed, the outer plug body is a cylindrical structure with both ends open, the outer plug body is sleeved outside the inner plug body, and the axes of the outer plug body and the inner plug body are colinear.

[0013] The edge of the opening end of the inner plug body is connected to the first end of the outer plug body.

[0014] Further optionally, a mounting hole is provided on the side wall of the inner plug body, and the mounting hole is used to connect with the piston rod.

[0015] Further optionally, a vent hole is also provided on the side wall of the inner plug body, and the vent hole enables the internal space of the inner plug body to communicate with the external space.

[0016] Further optionally, the inner wall and / or outer wall of the outer plug body is a conical surface, and the wall thickness of the first end of the outer plug body is smaller than the wall thickness of the second end.

[0017] Further optionally, the slider is provided with a radially penetrating slider hole, and the slider has a first working position and a second working position.

[0018] In the first working position, the slider hole is connected to the connecting hole, the inner cylinder hole and the outer cylinder hole are connected through the slider hole, and at the same time, the slider blocks the air leakage hole;

[0019] In the second working position, the slider hole is staggered with the communicating hole, and the slider blocks the communicating hole. Meanwhile, the slider is staggered with the air leakage hole, and the air leakage hole is connected with the sliding hole.

[0020] Further optionally, the elastic member is a spring, a first end of the spring is fixedly connected to the sliding block, and a second end of the spring is fixedly connected in the sliding hole.

[0021] Further optionally, a fixing structure is provided in the slide hole for fixing the second end of the spring, or,

[0022] The second end of the spring is interference fit with the sliding hole.

[0023] In a second aspect, the present invention provides a refrigerator comprising the above-mentioned displacement self-regulating compressor.

[0024] The present invention controls the effective compression volume by setting a double-layer cylinder and a slider assembly through the suction and exhaust pressure difference, realizes self-regulation of displacement, and thus adjusts the cooling capacity to adapt to the cooling capacity requirements under different working conditions. It can reduce the number of starts and stops of the compressor, greatly reduce energy loss during the startup process, and realize low-energy consumption and energy-saving operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail its exemplary embodiments with reference to the accompanying drawings. The accompanying drawings described below are only some embodiments of the present disclosure, and it is clear to a person skilled in the art that other accompanying drawings can be obtained from these accompanying drawings without creative work.

[0026] Figure 1 A cross-sectional schematic diagram showing the matching state of the cylinder seat and the piston of the displacement self-regulating compressor according to an embodiment of the present invention (the slider is located in the first working position);

[0027] Figure 2 Show Figure 1 Enlarged view of point A in the middle;

[0028] Figure 3 A cross-sectional schematic diagram showing the matching state of the cylinder seat and the piston of the displacement self-regulating compressor according to an embodiment of the present invention (the slider is located in the second working position);

[0029] Figure 4 An enlarged view of B of the present invention is shown;

[0030] Figure 5 A schematic structural diagram of a cylinder seat according to an embodiment of the present invention is shown;

[0031] Figure 6 A schematic diagram showing the structure of a piston according to an embodiment of the present invention is shown;

[0032] Figure 7 A schematic diagram showing the structure of a slider assembly according to an embodiment of the present invention is shown;

[0033] Figure 8 A schematic diagram of force analysis of a slider according to an embodiment of the present invention is shown.

[0034] In the figure:

[0035] 1. Cylinder seat; 10. Double-layer cylinder; 11. Inner cylinder hole; 12. Outer cylinder hole; 13. Sliding hole; 14. First hole; 15. Second hole; 16. Vent hole; 17. Slider; 171. Slider hole; 172. Connecting protrusion; 18. Spring; 2. Piston; 21. Inner plug body; 22. Outer plug body; 23. Mounting hole; 3. Piston rod. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0038] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0040] The present invention controls the effective compression volume by setting a double-layer cylinder and a slider assembly through the suction and exhaust pressure difference, realizes self-adjustment of displacement, thereby adjusting the cooling capacity, adapting to the cooling capacity requirements under different working conditions, reducing the number of compressor starts and stops, greatly reducing energy consumption losses during the startup process, and realizing low-energy consumption and energy-saving operation; it matches the refrigerator cooling capacity more accurately, the refrigerator compartment temperature fluctuates less, and improves the moisture retention and freshness of food. The present invention is described in detail in conjunction with specific embodiments below:

[0041] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the present invention provides a displacement self-regulating compressor, comprising:

[0042] like Figure 1 , Figure 5 As shown, a cylinder seat 1 is provided with a double-layer cylinder 10, and the double-layer cylinder 10 includes an inner cylinder hole 11 and an outer cylinder hole 12, wherein the inner cylinder hole 11 is a circular hole, and the outer cylinder hole 12 is an annular cavity formed circumferentially around the inner cylinder hole 11, and the inner cylinder hole 11 and the outer cylinder hole 12 can be connected through a connecting hole;

[0043] A sliding hole 13 is provided between the inner cylinder hole 11 and the outer cylinder hole 12. The sliding hole 13 penetrates the double-layer cylinder 10 along the axial direction. The communicating hole is connected to the sliding hole 13. An air leakage hole 16 connected to the sliding hole 13 is provided on the side wall of the outer cylinder hole 12.

[0044] A slider assembly, including a slider 17 and an elastic member, wherein the slider 17 and the elastic member are arranged in the slide hole 13, and the slider 17 moves in the slide hole 13 under the action of the elastic member and the gas pressure at both ends of the slide hole 13, and blocks the connecting hole or the air leakage hole 16 by moving;

[0045] The piston 2 includes an inner plug body 21 and an outer plug body 22 . The inner plug body 21 and the outer plug body 22 are an integral structure. The inner plug body 21 is slidably disposed in the inner cylinder hole 11 , and the outer plug body 22 is slidably disposed in the outer cylinder hole 12 .

[0046] Preferably, the outer cylinder hole 12 is an annular cavity with one end open and the other end closed, and the outer cylinder hole 12 is colinear with the axis of the inner cylinder hole 11. The sliding hole 13 is arranged parallel to the axis of the inner cylinder hole 11 and the outer cylinder hole 12, and penetrates at both ends of the double-layer cylinder 10. Further, a plurality of sliding holes 13 are distributed along the circumference of the inner cylinder hole 11. In this embodiment, two sliding holes 13 are arranged, and the end surface center points of the two sliding holes 13 are located on the same diameter line of the inner cylinder hole 11. It is easy to imagine that in other embodiments, a plurality of sliding holes 13 can also be arranged, and the plurality of sliding holes 13 are evenly distributed along the circumference of the inner shaft hole. For example, three sliding holes 13 can be arranged.

[0047] The connecting hole and the air leakage hole 16 are located near the closed end of the outer cylinder hole 12, wherein the connecting hole is located between the closed end and the air leakage hole 16. Specifically, the air leakage hole 16 is formed on the inner side wall of the outer cylinder hole 12, and the air leakage hole 16 is connected to the sliding hole 13. The first hole 14 and the second hole 15 connected to the sliding hole 13 are formed on the inner side wall of the outer cylinder hole 12 and the side wall of the inner cylinder hole 11, respectively. The axes of the first hole 14 and the second hole 15 are collinear, and the first hole 14 and the second hole 15 together constitute the connecting hole. The inner cylinder hole 11 and the outer cylinder hole 12 can be connected through the connecting hole, and the inner cylinder hole 11 and the outer cylinder hole 12 can be expanded and compressed at the same time, thereby increasing the displacement of the compressor. Preferably, the number of the air leakage holes 16 and the connecting holes is the same as that of the sliding holes 13, and they correspond one to one, that is, each sliding hole 13 is correspondingly provided with a connecting hole and an air leakage hole 16, so that the refrigerant flow between the inner cylinder hole 11 and the outer cylinder hole 12 is faster and more uniform.

[0048] like Figure 6 As shown, the piston 2 is an integral structure, that is, the inner plug body 21 and the outer plug body 22 are an integral structure, for example, the integral structure can be formed by an integral molding method. The inner plug body 21 is a cylindrical structure with one end open and the other end closed, and the outer plug body 22 is a cylindrical structure with both ends open. The outer plug body 22 is sleeved on the outside of the inner plug body 21, and the axis of the outer plug body 22 and the inner plug body 21 are colinear, and the edge of the open end of the inner plug body 21 is connected to the first end of the outer plug body 22. A mounting hole is provided on the side wall of the inner plug body 21, and the mounting hole is used to connect with the piston rod. The inner cavity of the inner plug body 21 can be used to accommodate the connecting end of the piston rod. An annular cavity is formed between the inner plug body 21 and the outer plug body 22. The inner plug body 21 is placed in the inner cylinder hole 11, and the outer plug body 22 is placed in the outer cylinder hole 12. The piston 2 moves under the action of the piston rod, and compression can be completed synchronously in the inner cylinder hole 11 and the outer cylinder hole 12.

[0049] The side wall of the inner plug body 21 is also provided with a vent hole, which connects the inner space of the inner plug body 21 with the outer space. The outer cylinder hole 12 can be connected with the space between the outer plug body 22 and the inner plug body 21 through the air leakage hole 16 and the sliding hole 13, so that the refrigerant in the outer cylinder hole 12 can flow into the space between the inner plug body 21 and the outer plug body 22 through the air leakage hole 16 and the sliding hole 13, and then be discharged into the shell of the compressor through the vent hole. At this time, only the inner plug body 21 is effectively compressed in the inner cylinder hole 11, and the displacement is minimal.

[0050] Preferably, the inner wall and / or outer wall of the outer plug body 22 is a conical surface, and the wall thickness of the first end of the outer plug body 22 is less than that of the second end. Thus, the second end of the outer plug body 22 can realize the action of compressing the refrigerant in the outer cylinder hole 12, while the other parts of the outer plug body 22 may not contact the outer cylinder hole 12, thereby reducing the contact area between the outer plug body 22 and the outer cylinder hole 12, and also providing a storage space for lubricating oil, reducing friction and reducing power consumption.

[0051] The slider 17 is a cylindrical structure and is slidably disposed in the slider 17. Preferably, a sliding seal is formed between the slider 17 and the sliding hole 13, that is, the refrigerant cannot flow between the two in the axial direction. The slider 17 is provided with a radially penetrating slider hole 171. The sliding hole 13 can be connected to the connecting hole, that is, the sliding hole 13 can be located between the first hole 14 and the second hole 15. The inner cylinder hole 11 and the outer cylinder hole 12 are connected through the first hole 14, the second hole 15 and the slider hole 171.

[0052] like Figure 2 , Figure 4 As shown, the slider 17 has a first working position and a second working position. Figure 2 As shown, in the first working position, the slider hole 171 is connected with the connecting hole, the inner cylinder hole 11 and the outer cylinder hole 12 are connected through the slider hole 171, and at the same time, the slider 17 blocks the air leakage hole 16. At this time, the inner cylinder hole 11 and the outer cylinder hole 12 can be expanded and compressed at the same time, thereby increasing the displacement of the compressor;

[0053] like Figure 4 As shown, in the second working position, the slider hole 171 is staggered with the connecting hole, and the slider 17 blocks the connecting hole. At the same time, the slider 17 is staggered with the bleed hole 16, and the bleed hole 16 is connected with the slide hole 13. The residual refrigerant in the outer cylinder hole 12 is discharged from the bleed hole 16 into the shell. At this time, only the inner plug body 21 is effectively compressed in the inner cylinder hole 11, and the displacement is minimal.

[0054] like Figure 7 , Figure 8 As shown, preferably, the elastic member is a spring 18, the first end of the spring 18 is fixedly connected to the slider 17, and the second end of the spring 18 is fixedly connected in the slide hole 13. Further, one end of the slider 17 is provided with a connecting protrusion 172, the radial dimension of the connecting protrusion 172 is smaller than the radial dimension of the slider 17, and the first end of the spring 18 is fitted onto the connecting protrusion 172 by interference fit to achieve fixed connection between the spring 18 and the slider 17.

[0055] Preferably, a fixing structure is provided in the slide hole 13 for fixing the second end of the spring 18, or the second end of the spring 18 is interference fit with the slide hole 13. Further, when a stopper is provided in the slide hole 13, the stopper cannot block the slide hole 13, and it is necessary to ensure that the refrigerant in the outer cylinder hole 12 can be discharged through the slide hole 13. It is easy to think that a better way is that the spring 18 is fixed in the slide hole 13 by interference fit and can apply elastic force to the slider 17.

[0056] Under different system working conditions, changes in system load lead to changes in suction and exhaust pressure, thereby controlling the movement of the slider 17. Figure 8As shown, the slider 17 is subjected to the exhaust pressure F1, the suction pressure F2 and the compression force F3 of the spring 18. In low temperature conditions (evaporation temperature is lower than -40°C, providing cooling load for the freezer and refrigerator at the same time), the system pressure difference (i.e. F1-F2) is large. In order to achieve force balance, the slider 17 moves to the first working position, and the compression amount of the spring 18 increases. At this time, F1-F2=F3, the force is balanced, the connecting hole is opened, and the air leakage hole 16 is closed. During air intake, the low-temperature and low-pressure refrigerant first enters the inner cylinder hole 11, and then enters the outer cylinder hole 12 through the connecting hole, and expands and compresses in the inner cylinder hole 11 and the outer cylinder hole 12 at the same time. At this time, the piston 2 is effectively compressed in the double-layer cylinder 10, and the displacement is maximum.

[0057] At normal temperature (evaporating temperature is about 0°C, only providing cooling load for the cold storage room), the system pressure difference (i.e. F1-F2) is small. In order to achieve force balance, the slider 17 moves to the second working position, and the compression of the spring 18 decreases. At this time, F1-F2=F3, and the force is balanced; the connecting hole is closed and the air leakage hole 16 is opened. When inhaling, the low-temperature and low-pressure refrigerant enters the inner cylinder hole 11, expands and compresses in the inner cylinder hole 11, and the residual refrigerant in the outer cylinder hole 12 is directly discharged from the air leakage hole 16 to the shell. At this time, only the inner plug body 21 is effectively compressed in the inner cylinder hole 11, and the displacement is minimal.

[0058] The present application realizes self-regulation of displacement by structurally improving the cylinders and pistons of multiple compressors, with relatively minor changes to the overall structure of the compressors. The displacement can be automatically adjusted according to the operating conditions of the compressors, thereby reducing the use of electronic control components, reducing costs, and improving the reliability of the entire machine.

[0059] The present invention also provides a refrigerator, including the above-mentioned self-regulating compressor. The refrigerator provided by the present invention can adapt to the refrigeration capacity requirements under different working conditions by adjusting the displacement of the compressor, thereby reducing the number of starts and stops of the compressor, greatly reducing energy consumption losses during the startup process, and achieving low-energy consumption and energy-saving operation; the refrigerator cold capacity is more accurately matched, the refrigerator compartment temperature fluctuates less, and the moisture retention and freshness of food are improved.

[0060] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A displacement self-regulating compressor, characterized in that: include: A cylinder seat, wherein a double-layer cylinder is arranged on the cylinder seat, and the double-layer cylinder comprises an inner cylinder hole and an outer cylinder hole, wherein the inner cylinder hole is a circular hole, and the outer cylinder hole is an annular cavity formed around the inner cylinder hole, and the inner cylinder hole and the outer cylinder hole can be connected through a connecting hole; The double-layer cylinder is provided with a sliding hole between the inner cylinder hole and the outer cylinder hole, the sliding hole penetrates along the axial direction of the double-layer cylinder, the communicating hole is communicated with the sliding hole, and the side wall of the outer cylinder hole is provided with an air leakage hole communicated with the sliding hole; A slider assembly, comprising a slider and an elastic member, wherein the slider and the elastic member are arranged in the sliding hole, and the slider moves in the sliding hole under the action of the elastic member and the gas pressure at both ends of the sliding hole, and blocks the connecting hole or the air leakage hole by moving; The piston comprises an inner plug body and an outer plug body, wherein the inner plug body and the outer plug body are fixed together or are an integral structure, the inner plug body can be slidably arranged in the inner cylinder hole, and the outer plug body can be slidably arranged in the outer cylinder hole.

2. The self-regulating displacement compressor according to claim 1, characterized in that: The outer cylinder hole is an annular cavity with one end open and the other end closed, and the connecting hole and the air leakage hole are located near the closed end of the outer cylinder hole, wherein the connecting hole is located between the closed end and the air leakage hole.

3. The self-regulating displacement compressor according to claim 1, characterized in that: The inner plug body is a cylindrical structure with one end open and the other end closed, and the outer plug body is a cylindrical structure with two ends open. The outer plug body is sleeved outside the inner plug body, and the axes of the outer plug body and the inner plug body are colinear. The edge of the opening end of the inner plug body is connected to the first end of the outer plug body.

4. The self-regulating displacement compressor according to claim 3, characterized in that: A mounting hole is provided on the side wall of the inner plug body, and the mounting hole is used to connect with the piston rod.

5. The self-regulating displacement compressor according to claim 4, characterized in that: A vent hole is also provided on the side wall of the inner plug body, and the vent hole enables the internal space of the inner plug body to communicate with the external space.

6. The self-regulating displacement compressor according to claim 3, characterized in that: The inner wall and / or outer wall of the outer plug body is a conical surface, and the wall thickness of the first end of the outer plug body is smaller than the wall thickness of the second end.

7. The self-regulating displacement compressor according to claim 1, characterized in that: The slider is provided with a radially penetrating slider hole, and the slider has a first working position and a second working position. In the first working position, the slider hole is connected to the connecting hole, the inner cylinder hole and the outer cylinder hole are connected through the slider hole, and at the same time, the slider blocks the air leakage hole; In the second working position, the slider hole is staggered with the communicating hole, and the slider blocks the communicating hole. Meanwhile, the slider is staggered with the air leakage hole, and the air leakage hole is connected with the sliding hole.

8. The self-regulating displacement compressor according to claim 7, characterized in that: The elastic member is a spring, a first end of the spring is fixedly connected to the sliding block, and a second end of the spring is fixedly connected in the sliding hole.

9. The self-regulating displacement compressor according to claim 8, characterized in that: A fixing structure is provided in the sliding hole for fixing the second end of the spring, or, The second end of the spring is interference fit with the sliding hole.

10. A refrigerator, characterized in that: A self-regulating compressor comprising the displacement according to any one of claims 1 to 9.

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