Electronic expansion valve

Abstract

According to the electronic expansion valve, the leakage amount of the valve opening part in the valve closing state can be relatively reduced, and the requirement for low inner leakage of the valve is met. The electronic expansion valve comprises a valve body and a valve needle assembly. The valve body comprises a valve port part. The valve needle assembly comprises a valve needle part and a sealing part, the valve needle part is provided with a mounting groove, the sealing part is limited in the mounting groove and comprises a sealing face part, and the sealing face part can abut against or be away from the valve port part; the valve needle assembly is provided with a first annular cavity, the part of the sealing part forms a part of cavity wall of the first annular cavity, the part of the mounting groove forms at least another part of cavity wall of the first annular cavity, the first annular cavity is located on the inner ring side of the sealing part, and the valve needle assembly comprises a sealing piece located in the first annular cavity. The first annular cavity is divided into a first sub-cavity and a second sub-cavity through a sealing piece, and the electronic expansion valve is provided with a valve cavity. In the valve closing state, the sealing face part abuts against the valve port part, the first sub-cavity communicates with the valve cavity, and the second sub-cavity communicates with a valve port of the valve port part.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular, to an electronic expansion valve. Background Art

[0002] Electronic expansion valves are widely used in refrigeration systems as throttling elements to adjust the flow of refrigerant. Usually, the coil component drives the rotor to rotate, and the threaded transmission drives the valve needle assembly to move up and down in the axial direction to control the opening of the valve port to achieve refrigerant flow regulation.

[0003] The electronic expansion valve includes a valve body, a core assembly, a screw rod and other parts. The valve body is provided with a valve port. When the valve is closed, the sealing part of the valve needle should maintain contact with the valve port. For technical personnel in this field, how to reduce the leakage of the valve port in the closed valve state and meet the low internal leakage requirements of the valve as much as possible is a technical problem that needs to be solved urgently. Utility Model Content

[0004] One purpose of the present application is to provide a new technical solution for an electronic expansion valve, which can relatively reduce the leakage of the valve mouth in the closed valve state and meet the low internal leakage requirements of the valve.

[0005] The electronic expansion valve in the present application comprises a valve body and a valve needle assembly, wherein the valve body comprises a valve port portion;

[0006] The valve needle assembly comprises a valve needle part and a sealing part, the valve needle part is provided with a mounting groove, the sealing part is limited in the mounting groove, the sealing part comprises a sealing surface part, and the sealing surface part can abut against or be away from the valve port part;

[0007] The valve needle assembly is provided with a first annular cavity, the sealing portion forms a part of the cavity wall of the first annular cavity, the mounting groove forms at least another part of the cavity wall of the first annular cavity, the first annular cavity is located on the inner ring side of the sealing portion, the valve needle assembly includes a sealing member, the sealing member is located in the first annular cavity, the first annular cavity is divided into a first sub-cavity and a second sub-cavity by the sealing member, and the electronic expansion valve is provided with a valve cavity;

[0008] In the valve closing state, the sealing surface portion abuts against the valve opening portion, the first sub-cavity is communicated with the valve cavity, and the second sub-cavity is communicated with the valve opening of the valve opening portion.

[0009] The present application provides an electronic expansion valve with a new structure. In the closed valve state, the sealing surface portion is against the valve mouth portion, and the refrigerant pressure accumulated between the sealing portion and the valve needle is connected to the valve cavity through the first sub-cavity, and the second sub-cavity is connected to the valve mouth of the valve mouth portion, so that it can be discharged in time, thereby achieving more effective sealing of the valve mouth by the valve needle assembly, and can relatively reduce the leakage of the valve mouth portion in the closed valve state, thereby meeting the low internal leakage requirement for the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0011] Figure 1 is a partial cross-sectional view of an electronic expansion valve in an embodiment of the present application;

[0012] Figure 2 It is a cross-sectional view of an electronic expansion valve, one;

[0013] Figure 3 yes Figure 2 A magnified view of part A;

[0014] Figure 4 It is the flow diagram of the electronic expansion valve;

[0015] Figure 5 This is a cross-sectional view of an electronic expansion valve, part 2;

[0016] Figure 6 yes Figure 5 Magnified view of the B1 area;

[0017] Figure 7 It is a cross-sectional view of the electronic expansion valve, part 3;

[0018] Figure 8 yes Figure 7 Magnified view of the B2 area.

[0019] Figure 1-Figure 8 middle:

[0020] 100. Electronic expansion valve;

[0021] 1. Valve body; 11. Valve cavity; 12. Valve port;

[0022] 2. Valve needle assembly;

[0023] 21, valve needle portion; 21a, mounting groove; 21b, needle body; 21c, retaining ring;

[0024] 22, sealing portion; 22a, first conical surface; 22b, second conical surface;

[0025] 23, first annular cavity; 23a, first sub-cavity; 23b, second sub-cavity; 23c, sealing ring; 24a, first row of liquid grooves; 24b, second row of liquid grooves;

[0026] 3. Nut; 4. Screw; DETAILED DESCRIPTION

[0027] The present application provides a new technical solution for an electronic expansion valve. The valve needle assembly is provided with a first annular cavity, and the first annular cavity is divided into a first sub-cavity and a second sub-cavity spaced apart from each other. The first sub-cavity is connected to the valve cavity, and the second sub-cavity is connected to the valve port. On the one hand, the demand for low internal leakage is met; on the other hand, the sealing part is prevented from being damaged by the expanding refrigerant, resulting in sealing failure.

[0028] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] The up and down, left and right directions in this article are defined by the axial and radial directions of the valve needle assembly 2. The direction in which the valve needle assembly moves to close the valve port is the axial direction. In the axial direction, the direction pointing to the valve port side is the bottom, and the direction away from the valve port side is the top. The left and right directions are defined in the radial direction. Figure 1 and Figure 2 In the text, the left side of the paper is left and the right side is right.

[0030] Unless otherwise specified, the inside and outside in this article are defined with reference to the central axis of the valve needle assembly. The side pointing to the central axis is the inside, and in the radial direction, the side opposite to the central axis is the outside.

[0031] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0032] Please refer to Figures 1 to 4 , Figure 1 is a partial cross-sectional view of an electronic expansion valve in an embodiment of the present application; Figure 2 It is a cross-sectional view of an electronic expansion valve, one of which shows the state where the valve needle assembly forms a radial seal with the valve port (conical seal); Figure 3 yes Figure 2 A magnified view of part A; Figure 4 It is the flow diagram of the electronic expansion valve.

[0033] As shown in the figure, the electronic expansion valve 100 of the utility model includes a valve body 1 and a valve needle assembly 2, the valve body 1 surrounds a valve cavity 11, and the valve cavity 11 has a valve port 12, that is, the valve body 1 includes a valve port portion, and the valve port portion has a valve port 12, wherein the valve body 1 can be an integral structure and directly provided with the valve port portion, or the valve body 1 can be a split structure, that is, the valve body 1 includes a main body and a valve port portion, and the main body is connected to the valve port portion; the valve needle assembly 2 moves axially to adjust the flow of the valve port portion; wherein the principle of the axial movement of the valve needle assembly 2 is that the valve needle assembly 2 and the nut 3 form a threaded pair, the nut 3 and the screw rod 4 of the driving member form a threaded pair, the screw rod 4 is drivingly connected to the rotor of the driving member, and under the drive of the rotor, the screw rod 4 rotates along the first turn or the second turn to drive the valve needle assembly 2 to move up and down along the axial direction to gradually approach the blocked valve port 12 or gradually move away from the open valve port 12.

[0034] Please combine Figure 4 , Figure 5 and Figure 7 , Figure 5 and Figure 7 The two schematic diagrams are of the structure of the valve needle assembly 2. The valve needle assembly 2 specifically includes a valve needle portion 21 and a sealing portion 22. The sealing portion 22 includes a sealing surface portion, which can abut against or move away from the valve port portion to open and block the valve port 12. The valve needle portion 21 is provided with a mounting groove 21a for accommodating the sealing portion 22, that is, the sealing portion 22 is limited to the mounting groove 21a, and the mounting groove 21a is arranged around the valve needle portion 21. The mounting groove 21a is located on the lower side of the valve needle portion 21, that is, on the side of the valve needle portion 21 close to the valve port portion. The mounting groove 21a can be opened by integrally forming the valve needle portion 21, or the valve needle portion 21 specifically includes a needle body 21b and a retaining ring 21c. The needle body 21b is fixedly connected or limitedly connected to the retaining ring 21c to roughly surround the mounting groove 21a. Of course, other structures can also be provided to surround the mounting groove 21a, which is not specifically limited here. For example, The side wall of the needle body 21b forms a groove to serve as the mounting groove 21a. It is also possible that the retaining ring 21c is not provided, but a plurality of protrusions are formed on the side wall of the needle body 21b, and the protrusions are closed along the circumferential direction, thereby surrounding the mounting groove 21a; an annular groove is provided at the lower end of the needle body 21b, and the annular groove extends axially upward from the end face of the needle body 21b, and the retaining ring 21c is connected to the lower end of the needle body 21b, thereby surrounding the mounting groove 21a, and the groove wall of the mounting groove 21a includes a groove side wall and a groove bottom wall connected to each other, and the groove bottom wall is connected between the two groove side walls, and the groove opening of the mounting groove 21a is radially opposite to the groove bottom wall of the mounting groove 21a, and the upper surface of the retaining ring 21c is axially opposite to the groove bottom wall of the annular groove, and together with the groove side wall of the annular groove, it constitutes the groove wall of the mounting groove 21a, and the needle body 21b and the retaining ring 21c of the split structure can be easily processed, and the retaining ring 21c and the needle body 21b can be welded ( Figure 7 shown) or riveted ( Figure 5In order to form an interference fit with the sealing part 22 and thus fix the sealing part 22 in the mounting groove 21a, the axial dimension H1 of the sealing part 22 is greater than or equal to the axial dimension H2 of the mounting groove 21a, and H2 is also the distance between the upper surface of the retaining ring 21c and the bottom wall of the annular groove; thus, part of the sealing part 22 is located in the mounting groove 21a and has an interference fit with the mounting groove 21a, and the other part of the sealing part 22 extends out of the notch of the mounting groove 21a to form a sealing pair with the valve mouth; specifically, the part of the sealing part 22 extending out of the notch is the lower end face of the sealing part 22, the part of the lower end face of the sealing part 22 close to its inner ring side has an interference fit with the upper surface of the retaining ring 21c, and the part of the lower end face of the sealing part 22 close to its outer ring side does not contact the upper surface of the retaining ring 21c, that is, the radial dimension of the retaining ring 21c is smaller than the radial dimension of the annular groove, thereby avoiding interference with the sealing part 22 and the valve mouth to form a sealing pair; please combine Figure 2 and Figure 5 ,in, Figure 5 It is a cross-sectional view of an electronic expansion valve, and the second one shows another sealing state of the valve needle assembly 2 and the valve mouth; here, the sealing portion 22 and the valve mouth can be radially sealed (conical surface sealed) or axially sealed (end surface sealed). In the case of radial sealing, the portion of the sealing portion 22 opposite to the valve mouth forms a cone, so that it can be pressed against the valve mouth in the radial direction; in the case of axial sealing, the lower end face of the sealing portion 22 is a plane, which is pressed against the valve mouth in the axial direction.

[0035] In the prior art, the valve needle is made of metal. When the valve needle forms a seal with the valve mouth, there are high requirements for the processing accuracy of the valve mouth and the valve needle. Due to the influence of machine tool accuracy, tool accuracy and the material itself, it is difficult to achieve the requirements of roundness, coaxiality, etc. of the perfect sealing pair. In particular, when the valve mouth is large in size, the processing accuracy of the valve needle and the valve mouth is higher, which leads to a significant increase in the processing cost of the valve needle and the valve mouth. At the same time, internal leakage may still occur. However, in the above-mentioned embodiment, the sealing part 22 is made of non-metallic material, specifically polymer material or rubber. When the sealing part 22 and the valve mouth are both made of polymer material, the hardness of the sealing part 22 needs to be less than the hardness of the valve mouth; so that when the sealing part 22 abuts against the valve mouth, the sealing part 22 is subjected to the pressure of the sealing line of the valve mouth and undergoes a certain deformation, thereby forming a contour with the sealing line of the valve mouth, thereby achieving a more effective sealing of the valve needle assembly 2 to the valve mouth, preventing internal leakage, and also reducing the processing difficulty of the valve needle assembly 2 and reducing the cost.

[0036] Further, combined with Figure, Figure 6 and Figure 8 , Figure 6 yes Figure 5 Magnified view of the B1 area; Figure 8 yes Figure 7 Magnified view of the B2 area.

[0037] Since the sealing portion 22 is arranged in the accommodating groove of the valve needle portion 21, but since the sealing portion 22 and the valve body 1 are separate structures, during the long-term use of the electronic expansion valve 100, the refrigerant is easy to penetrate into the gap between the sealing portion 22 and the valve body 1. When the temperature of the refrigerant changes and expands, the refrigerant in the gap will damage the sealing portion 22, or even push the sealing portion 22 out of the mounting groove 21a, thereby causing sealing failure. In order to avoid the occurrence of sealing failure, the valve needle assembly 2 of the present application is provided with a first annular cavity 23, part of the sealing portion 22 forms a part of the cavity wall of the first annular cavity 23, and part of the mounting groove 21a forms at least another part of the cavity wall of the first annular cavity 23, that is, the sealing portion 22 and the mounting groove 21a surround the first annular cavity 23, and the first annular cavity 23 is located on the inner ring side of the sealing portion 22. The valve needle assembly 2 also includes a sealing member, which is located in the first annular cavity 23. The first annular cavity 23 is separated into a first sub-cavity 23a and a second sub-cavity 23b by the sealing member. The sealing member can be a sealing ring 23. c, the first sub-chamber 23a is communicated with the valve chamber 11, and the second sub-chamber 23b is communicated with the valve port 12 of the valve port; the first sub-chamber 23a and the second sub-chamber 23b are separated by a sealing ring 23c, and the sealing ring 23c abuts between the sealing portion 22 and the groove side wall of the mounting groove 21a, thereby forming two mutually sealed sub-chambers, thereby preventing the refrigerant in the valve chamber 11 from leaking from the first annular chamber 23 to the outside of the valve port; of course, the sealing portion 22 may also have a convex ring, which abuts against the groove wall, thereby sealing the first sub-chamber 2 3a is separated from the second sub-chamber 23b; in order to connect the first sub-chamber 23a with the valve chamber 11 and the second sub-chamber 23b with the valve mouth, the valve needle assembly 2 has a first liquid drainage groove 24a and a second liquid drainage groove 24b, and at least part of the first liquid drainage groove 24a and the second liquid drainage groove 24b are surrounded by the sealing portion 22 and the groove wall of the mounting groove 21a; in the valve closed state, the first liquid drainage groove 24a connects the first sub-chamber 23a with the valve chamber 11, and the second liquid drainage groove 24b connects the second sub-chamber 23b with the valve mouth.

[0038] During the use of the above-mentioned electronic expansion valve 100, although the upper surface of the sealing portion 22 and the bottom wall of the annular groove are in contact with each other, after long-term use, if there is a gap between the two, the refrigerant in the gap will gradually gather in the first annular cavity 23. If the first annular cavity 23 is not provided, the refrigerant in the gap will damage the sealing portion 22 under the condition of accumulating a certain pressure. There is also a part of the refrigerant entering from the first liquid discharge groove 24a in the first annular cavity 23. After the refrigerant temperature rises and expands, the refrigerant will form high pressure due to the limited space of the first annular cavity 23 and the first liquid discharge groove 24a. The refrigerant in the first annular cavity 23 will be discharged from the first liquid discharge groove 24a to the valve cavity 11, thereby quickly releasing the pressure of the refrigerant. , thereby preventing the refrigerant from forming high pressure and damaging the sealing part 22; by the same token, the refrigerant will also be infiltrated between the lower surface of the sealing part 22 and the upper surface of the retaining ring 21c, and the refrigerant will also be collected in the second sub-chamber 23b in the first annular cavity 23, and according to the above principle, after the refrigerant expands, it will be discharged from the second liquid discharge groove 24b; of course, in order to better guide the refrigerant between the lower surface of the sealing part 22 and the upper surface of the retaining ring 21c, the sealing part 22 and the groove wall of the mounting groove 21a also form a second annular cavity, in the axial direction, the first annular cavity 23 is located on the upper side of the second annular cavity, the second annular cavity is connected to the second sub-chamber 23b, and at the same time connected to the valve mouth, the second annular cavity is located between the second sub-chamber 23b and the valve mouth.

[0039] The specific arrangement of the first annular cavity 23 and the second annular cavity is described below with reference to a specific embodiment.

[0040] In a specific implementation, such as Figure 2-Figure 4 , Figure 5 and Figure 8 As shown, the sealing portion 22 is provided with a first conical surface 22a, which is located at the upper part of the inner ring side of the sealing portion 22 and can be formed by cutting or injection molding. The first conical surface 22a is relative to the position where the groove side wall of one side of the mounting groove 21a is connected with the groove bottom wall, and surrounds a first annular cavity 23; that is, the first conical surface 22a is opposite to the position where the groove bottom wall and the groove side wall of the annular groove of the needle body portion are connected, and the groove bottom wall of the annular groove extends radially as the upper groove side wall of the mounting groove 21a, and the groove side wall of the annular groove extends axially as The bottom wall of the mounting groove 21a, the first conical surface 22a is radially opposite to the upper corner position of the mounting groove 21a, and then, the first conical surface 22a forms a part of the cavity wall of the first annular cavity 23, and the groove side wall and the groove bottom wall of one side of the mounting groove 21a form at least another part of the cavity wall of the first annular cavity 23; a part of the sealing ring 23c is against the first conical surface 22a, another part is against the groove side wall, and another part is against the groove bottom wall, so that the sealing ring 23c forms three sealing surfaces, thereby improving the sealing performance of the sealing ring 23c.

[0041] The sealing portion 22 also includes a second conical surface 22b, which is located at the lower part of the inner ring side of the sealing portion 22, and the second conical surface 22b is opposite to the position where the other side groove side wall of the mounting groove 21a is connected with the groove bottom wall, that is, the second conical surface 22b is opposite to the position where the upper surface of the retaining ring 21c (the lower side groove side wall of the mounting groove 21a) and the groove side wall of the annular groove (the groove bottom wall of the mounting groove 21a) are connected, thereby forming a second annular cavity.

[0042] The specific structure of the first drainage groove 24a and the second drainage groove 24b is described below. In one example, the first drainage groove 24a and the second drainage groove 24b have drainage groove bodies, and the drainage groove bodies are both located in the sealing part 22. The groove wall of the mounting groove 21a blocks the groove opening of the drainage groove body; the matching depth between the drainage groove body and the groove wall or the sealing part 22 is defined as L, and the axial height of the mounting groove 21a is H2, then 0.02H2≤L≤0.15H2 is satisfied; by opening the drainage groove bodies in the sealing part 22, the processing difficulty can be reduced; in another example, the first drainage groove 24a and the second drainage groove 24b have drainage groove bodies, and the drainage groove bodies are both located in the sealing part 22. At least part of the second liquid-discharging groove 24b is surrounded by the sealing portion 22 and the retaining ring 21c. The second liquid-discharging groove 24b has a liquid-discharging groove body, part of which is located in the retaining ring 21c, and the sealing portion 22 blocks the groove opening of the liquid-discharging groove body. Since the retaining ring 21c and the needle body are separate structures, the retaining ring 21c is processed before the retaining ring 21c and the needle body form a fixed connection, thereby simplifying the processing technology. Here, the liquid-discharging groove body can extend radially and be arranged at intervals along the circumferential direction; it can also extend in a curve or in a ring. The specific structure of the liquid-discharging groove body is not limited here.

[0043] Compared with the prior art, the electronic expansion valve of the utility model has the following advantages:

[0044] First, the valve needle assembly 2 can seal the valve port 12 more effectively to prevent internal leakage, and the processing difficulty and cost of the valve needle assembly 2 can be reduced.

[0045] Second, it is to prevent the refrigerant from forming high pressure and damaging the sealing portion 22.

[0046] The electronic expansion valve provided by the utility model is introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An electronic expansion valve, characterized in that: It includes a valve body and a valve needle assembly, wherein the valve body includes a valve port portion; The valve needle assembly comprises a valve needle part and a sealing part, the valve needle part is provided with a mounting groove, the sealing part is limited in the mounting groove, the sealing part comprises a sealing surface part, and the sealing surface part can abut against or be away from the valve port part; The valve needle assembly is provided with a first annular cavity, the sealing portion forms a part of the cavity wall of the first annular cavity, the mounting groove forms at least another part of the cavity wall of the first annular cavity, the first annular cavity is located on the inner ring side of the sealing portion, the valve needle assembly includes a sealing member, the sealing member is located in the first annular cavity, the first annular cavity is divided into a first sub-cavity and a second sub-cavity by the sealing member, and the electronic expansion valve is provided with a valve cavity; In the valve closing state, the sealing surface portion abuts against the valve opening portion, the first sub-cavity is communicated with the valve cavity, and the second sub-cavity is communicated with the valve opening of the valve opening portion.

2. The electronic expansion valve according to claim 1, characterized in that: The sealing member comprises a sealing ring, which divides the first annular cavity into the first sub-cavity and the second sub-cavity, and the sealing ring abuts between the sealing portion and the groove wall of the installation groove.

3. The electronic expansion valve according to claim 2, characterized in that: The sealing portion is provided with a first conical surface, the first conical surface forms a part of the cavity wall of the first annular cavity, the groove wall of the mounting groove comprises a groove side wall and a groove bottom wall connected to each other; the groove side wall and the groove bottom wall on one side of the mounting groove form at least another part of the cavity wall of the first annular cavity; A portion of the sealing ring abuts against the first conical surface, another portion abuts against the groove side wall of the installation groove, and another portion abuts against the groove bottom wall of the installation groove.

4. The electronic expansion valve according to claim 3, characterized in that: The sealing portion further includes a second conical surface, the second conical surface is located at a position where the groove side wall on the other side of the installation groove meets the groove bottom wall to enclose a second annular cavity; The second annular cavity is communicated with the second sub-cavity and is communicated with the valve port of the valve port portion.

5. The electronic expansion valve according to claim 1, characterized in that: The valve needle assembly comprises a first liquid drain groove and a second liquid drain groove, wherein at least a portion of the first liquid drain groove and the second liquid drain groove is surrounded by the sealing portion and the groove wall of the mounting groove; In the valve closed state, the first liquid row groove connects the first sub-cavity with the valve cavity, and the second liquid row groove connects the second sub-cavity with the valve port.

6. The electronic expansion valve according to claim 5, characterized in that: The first liquid draining groove and the second liquid draining groove have liquid draining groove bodies, and the liquid draining groove bodies are both located at the sealing portion, and the groove wall of the mounting groove blocks the groove opening of the liquid draining groove body.

7. The electronic expansion valve according to claim 5, characterized in that: The valve needle portion includes a needle body and a retaining ring, the needle body is fixedly connected or limit-connected to the retaining ring to form the installation groove, at least part of the second liquid drainage groove is surrounded by the sealing portion and the retaining ring, the second liquid drainage groove has a liquid drainage groove body, part of the liquid drainage groove body is located in the retaining ring, and the sealing portion blocks the notch of the liquid drainage groove body.

8. The electronic expansion valve according to claim 6 or 7, characterized in that: The matching depth between the drainage groove body and the groove wall or the sealing portion is defined as L, and the axial height of the mounting groove is defined as H2, then 0.02H2≤L≤0.15H2 is satisfied.

9. The electronic expansion valve according to any one of claims 1 to 7, characterized in that: The sealing portion forms a radial seal or an axial seal with the valve port.

10. The electronic expansion valve according to any one of claims 1 to 7, characterized in that: The hardness of the sealing portion is smaller than the hardness of the valve port.

11. The electronic expansion valve according to claim 10, characterized in that: The axial height H1 of the sealing portion is greater than or equal to the axial height H2 of the mounting groove.

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