Condenser heat dissipation structure with adjustable fin spacing

Abstract

The utility model relates to the related technical field of condensers, in particular to a condenser heat dissipation structure with adjustable fin spacing, which comprises a mounting plate, a shell is arranged on the surface of a positioning mechanism, a condenser pipe is mounted in the shell, and an adjusting mechanism is arranged in the shell. According to the condenser heat dissipation structure with the fin spacing adjustable, through the arrangement of the adjusting mechanism, the distance between the adjacent fin mounting frames is changed, then the spacing of the fins is adjusted, in the sliding process, second springs, limiting plates and locking blocks in telescopic holes cooperatively work, after sliding blocks move to proper positions, the second springs push the limiting plates, and the fins are fixed through the limiting plates. The locking blocks are embedded into the adjusting holes, the sliding blocks are fixed, it is ensured that the distance between the fins is kept stable, the heat dissipation requirements under different working conditions are met, the rotating angles of the fins can be accurately adjusted by controlling the driving motor, the optimal included angles are formed between the fins and the air flowing direction, the contact area and heat exchange efficiency of air and the fins are improved, and the heat dissipation effect is further optimized.

Description

Technical Field

[0001] This utility model relates to the field of condenser technology, and in particular to a condenser heat dissipation structure with adjustable fin spacing. Background Technology

[0002] The condenser is a crucial component of a refrigeration system. Its primary function is to cool and condense high-temperature, high-pressure gaseous refrigerant into liquid refrigerant, while simultaneously dissipating heat into the surrounding environment. Ambient temperatures vary significantly across seasons and regions. For instance, in the hot summer, the high ambient temperature requires the condenser to dissipate more heat. In this case, reducing the fin spacing and increasing the fin density can increase the heat dissipation area and enhance the cooling effect. Conversely, in the cold winter, the low ambient temperature reduces the heat dissipation demand. Appropriately increasing the fin spacing can prevent excessive heat dissipation, reduce heat loss, and also lower airflow resistance, saving fan energy. Therefore, a condenser heat dissipation structure with adjustable fin spacing is particularly needed.

[0003] However, the traditional condenser fin structure is fixed and cannot be flexibly adjusted when the actual operating conditions change. In high-temperature environments, the heat dissipation demand increases, but the fixed spacing of the fins limits the heat dissipation area and ventilation effect, making it difficult to dissipate heat quickly. This leads to an increase in the temperature and pressure of the refrigerant inside the condenser and a significant decrease in the efficiency of the refrigeration system. In cold environments, the heat dissipation demand decreases, and overly dense fins can actually hinder airflow, causing unnecessary heat loss and increasing energy consumption. Utility Model Content

[0004] The purpose of this invention is to provide a condenser heat dissipation structure with adjustable fin spacing, which has the function of adjusting the fin spacing inside the condenser, and can also adjust the height of the condenser according to the actual situation, thus solving the problems of traditional condensers.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a condenser heat dissipation structure with adjustable fin spacing, including a mounting plate, a positioning mechanism above the mounting plate, a housing on the surface of the positioning mechanism, a cover plate on the surface of the housing, a mounting bolt connecting the cover plate and the housing, an air outlet on the surface of the cover plate, a dustproof plate on the inner side of the air outlet, a condenser tube installed inside the housing, and an adjustment mechanism inside the housing;

[0006] The adjustment mechanism includes an adjustment frame, which is installed at the upper and lower ends inside the housing. The surface of the adjustment frame has a sliding groove, and a slider is slidably connected inside the sliding groove. The slider has a telescopic hole inside, and a second spring is connected to the inner end of the telescopic hole. A limit plate is connected to the outer end of the second spring, and a locking block is connected to the outer end of the limit plate. An adjustment hole is provided on the inner side of the sliding groove. A drive motor is installed above the slider, and a rotating shaft is connected to the output end of the drive motor. A fin mounting bracket is installed on the surface of the rotating shaft, and fins are installed on the surface of the fin mounting bracket.

[0007] Preferably, the positioning mechanism includes a base, the bottom of which is fixedly connected to the top of the mounting plate. A fixing hole is provided on one side surface of the base. A positioning rod is slidably connected inside the base. A positioning hole is provided on the surface of the positioning rod. A first spring is connected to the outside of the fixing hole. A stop block is connected to the outer end of the first spring. A fixing rod is connected to the inner end of the stop block. A support plate is connected to the top of the positioning rod. A vent plate is installed on the inner side of the support plate. The housing is installed on the upper surface of the support plate and the vent plate.

[0008] Preferably, the outer wall dimension of the positioning rod matches the inner wall dimension of the base, and the base and the positioning rod are provided with four identical sets, which are symmetrically distributed about the central axis of the mounting plate.

[0009] Preferably, multiple sets of positioning holes are equally spaced on the surface of the positioning rod, and the position of each set of positioning holes corresponds to the position of the fixing hole.

[0010] Preferably, the stop block is formed by the cooperation of the first spring and the fixing rod to form a telescopic structure, and the size of the fixing rod matches the size of the fixing hole and the positioning hole.

[0011] Preferably, the size of the slider is adapted to the size of the groove, and multiple identical sets of adjustment holes are provided on the inner wall of the groove.

[0012] Preferably, the slider, drive motor and rotating shaft are distributed in multiple identical sets at equal intervals inside the slide groove, and the fin mounting brackets are distributed in three sets at equal intervals on the surface of the rotating shaft, with multiple sets of fins mounted on the surface of each set of fin mounting brackets.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This condenser heat dissipation structure with adjustable fin spacing, through the setting of the adjustment mechanism, realizes the change of the distance between adjacent fin mounting brackets, thereby adjusting the fin spacing. During the sliding process, the second spring, the limiting plate and the locking block in the telescopic hole work together. When the slider moves to the appropriate position, the second spring pushes the limiting plate, so that the locking block is embedded in the adjustment hole, fixing the slider and ensuring that the fin spacing remains stable, meeting the heat dissipation requirements under different working conditions. Controlling the drive motor can precisely adjust the rotation angle of the fins, so that the fins and the air flow direction form the optimal angle, improving the contact area and heat exchange efficiency between the air and the fins, and further optimizing the heat dissipation effect. Attached Figure Description

[0014] Figure 1 This is a side view of the structure of the present utility model;

[0015] Figure 2 This is a schematic diagram of the positioning mechanism of this utility model;

[0016] Figure 3 This is a schematic diagram of the adjustment mechanism of this utility model;

[0017] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Mounting plate; 2. Positioning mechanism; 201. Base; 202. Fixing hole; 203. Positioning rod; 204. Positioning hole; 205. First spring; 206. Stop block; 207. Fixing rod; 208. Support plate; 209. Ventilation plate; 3. Shell; 4. Cover plate; 5. Mounting bolt; 6. Air outlet; 7. Dustproof plate; 8. Condenser pipe; 9. Adjustment mechanism; 901. Adjustment frame; 902. Slide groove; 903. Slider; 904. Telescopic hole; 905. Second spring; 906. Limiting plate; 907. Locking block; 908. Adjustment hole; 909. Drive motor; 910. Rotating shaft; 911. Fin mounting frame; 912. Fin. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4This utility model provides a technical solution: a condenser heat dissipation structure with adjustable fin spacing, including a mounting plate 1, a positioning mechanism 2 above the mounting plate 1, a housing 3 on the surface of the positioning mechanism 2, a cover plate 4 on the surface of the housing 3, a mounting bolt 5 connecting the cover plate 4 and the housing 3, an air outlet 6 on the surface of the cover plate 4, a dustproof plate 7 on the inner side of the air outlet 6, a condenser pipe 8 inside the housing 3, and an adjustment mechanism 9 inside the housing 3;

[0021] The adjustment mechanism 9 includes an adjustment frame 901, which is installed at the upper and lower ends inside the housing 3. A groove 902 is formed on the surface of the adjustment frame 901, and a slider 903 is slidably connected inside the groove 902. An extension hole 904 is formed inside the slider 903, and a second spring 905 is connected to the inner end of the extension hole 904. A limit plate 906 is connected to the outer end of the second spring 905, and a locking block 907 is connected to the outer end of the limit plate 906. An adjustment hole 908 is formed on the inner side of the groove 902. A drive motor 909 is installed above the slider 903, and a rotating shaft 910 is connected to the output end of the drive motor 909. The surface of the rotating shaft 910... A fin mounting bracket 911 is installed on the surface of the fin mounting bracket 911, and fins 912 are installed on the surface of the fin mounting bracket 911. Through the adjustment mechanism 9, when the spacing of the fins 912 needs to be adjusted, the user manually pushes the slider 903 to slide within the slide groove 902. Since the slide groove 902 guides the slider 903, it ensures that the slider 903 can only move in a specific direction, thereby driving the drive motor 909, rotating shaft 910, fin mounting bracket 911, and fins 912 mounted above the slider 903 to move synchronously. During the sliding process, the second spring 905, the limiting plate 906, and the locking block 907 within the telescopic hole 904 work together to achieve position locking. When slider 903 moves to the appropriate position, the elastic restoring force of the second spring 905 pushes the limiting plate 906, causing the locking block 907 to embed into the adjusting hole 908, fixing slider 903 in the current position. At this time, the distance between adjacent fin mounting brackets 911 changes, and the spacing of the corresponding fins 912 is also adjusted to meet the heat dissipation requirements under different working conditions. If the spacing needs to be adjusted again, the user needs to manually pull the locking block 907 outward to overcome the elastic force of the second spring 905, causing the locking block 907 to disengage from the adjusting hole 908, releasing the lock on slider 903, and then continue to slide slider 903 to adjust the spacing. When it is necessary to change the angle of fins 912... When the temperature is reached, the drive motor 909 is started. After the drive motor 909 starts running, its output end drives the rotating shaft 910 to rotate. The fin mounting bracket 911 connected to the rotating shaft 910 rotates synchronously. The fins 912 fixed on the fin mounting bracket 911 will also change their angle accordingly. By controlling the number of rotations of the drive motor 909, the time, or the feedback from the angle sensor, the rotation angle of the fins 912 can be precisely adjusted. For example, when it is necessary to enhance the heat dissipation effect of the windward side, the drive motor 909 can be used to rotate the fins 912 to a suitable angle so that it forms the best angle with the airflow direction, thereby increasing the contact area and heat exchange efficiency between the air and the fins 912.

[0022] Furthermore, the positioning mechanism 2 includes a base 201, the bottom of which is fixedly connected to the top of the mounting plate 1. A fixing hole 202 is provided on one side surface of the base 201. A positioning rod 203 is slidably connected inside the base 201. A positioning hole 204 is provided on the surface of the positioning rod 203. A first spring 205 is connected to the outside of the fixing hole 202. A stop block 206 is connected to the outer end of the first spring 205. A fixing rod 207 is connected to the inner end of the stop block 206. A support plate 208 is connected to the top of the positioning rod 203. A ventilated plate 209 is installed on the inner side of the support plate 208. The housing 3 is installed on the upper surface of the support plate 208 and the ventilated plate 209. Through the setting of the positioning mechanism 2, when it is necessary to adjust the position of the housing 3, the stop block 206 is pulled outward. The stop block 206 drives the fixing rod 207 to disengage from the positioning hole 204, and the first spring 205 is stretched. At this time, the positioning rod 203 can slide up and down in the base 201. The height of the positioning rod 203 can be adjusted according to actual needs, thereby changing the height of the support plate 208. For example, in different installation environments, the height can be changed by adjusting the positioning rod 203. The height of rod 203 allows the housing 3 to be positioned appropriately, ensuring a reasonable relative position between the condenser and other components. After adjusting the positioning rod 203 to the appropriate height, the stop block 206 is released. The elastic restoring force of the first spring 205 causes the stop block 206 to move inward, and the fixing rod 207 is reinserted into the positioning hole 204. The positioning rod 203 is then fixed in the new position, and the support plate 208 is locked accordingly. In this way, the housing 3 is stably installed above the support plate 208 and the vent plate 209, ensuring that the condenser is not affected by vibration during operation. The vent plate 209 is installed inside the support plate 208. The vent holes on its surface allow air to pass through smoothly when the condenser is working. This provides the necessary ventilation for the condenser's heat dissipation and prevents large debris from entering the housing 3, protecting components such as the condenser tube 8. At the same time, the vent plate 209, together with the support plate 208, the positioning rod 203, and the base 201, constitute a stable support structure, enhancing the strength and stability of the entire condenser heat dissipation structure.

[0023] Furthermore, the outer wall dimensions of the positioning rod 203 match the inner wall dimensions of the base 201. The base 201 and the positioning rod 203 are provided with four identical sets, symmetrically distributed around the central axis of the mounting plate 1. Through the arrangement of the base 201 and the positioning rod 203, a stable and flexible support system is provided for the condenser shell 3. On the one hand, the precise dimensional fit allows the positioning rod 203 to maintain vertical lifting and lowering when sliding within the base 201, avoiding tilting or shaking, ensuring that the condenser remains horizontal after height adjustment, and maintaining the normal working posture of the condenser tube 8 and fins 912. On the other hand, the four sets of symmetrically distributed structures significantly improve the overall load-bearing capacity, evenly distributing the weight of the shell 3 and internal components, preventing excessive local stress from causing structural deformation. For example, when installing large condensers, even if the equipment is heavy, this structure can ensure the condenser is stably installed through symmetrical support, while also adapting to installation environments of different heights, enhancing the versatility of the equipment.

[0024] Furthermore, multiple sets of positioning holes 204 are evenly spaced on the surface of the positioning rod 203, and the position of each set of positioning holes 204 corresponds to the position of the fixing hole 202. Through the setting of positioning holes 204, precise graded adjustment of the condenser height is realized. Multiple sets of positioning holes 204 provide users with diverse height adjustment options. The positioning rod 203 can be adjusted to a suitable height according to the actual installation space, ventilation requirements, or equipment matching requirements. When the fixing rod 207 is inserted into the positioning holes 204 at different positions, the height of the condenser can be adjusted in a fixed increment, avoiding over-adjustment or under-adjustment. This precise positioning mechanism not only ensures the convenience of adjustment, but also ensures that the positioning rod 203 can be firmly locked after each adjustment, preventing height changes due to vibration and other factors, and ensuring stable operation of the condenser.

[0025] Furthermore, the stop 206, through the cooperation of the first spring 205 and the fixing rod 207, forms a telescopic structure. The size of the fixing rod 207 matches the size of the fixing hole 202 and the positioning hole 204. The setting of the fixing rod 207 constructs a reliable positioning and locking system. When the stop 206 is pulled, the fixing rod 207 retracts against the spring force, releasing the lock on the positioning rod 203, which facilitates height adjustment. After the stop 206 is released, the first spring 205 pushes the fixing rod 207 to accurately insert into the corresponding positioning hole 204, realizing the stable fixation of the positioning rod 203. Its precise size design ensures that the fixing rod 207 and the hole are tightly engaged. Even under the action of external forces such as vibration and wind pressure generated during the operation of the condenser, it can still maintain the locked state, preventing the positioning rod 203 from loosening and shifting, and providing continuous and stable support for the condenser.

[0026] Furthermore, the dimensions of the slider 903 are adapted to the dimensions of the slide groove 902. Multiple sets of adjustment holes 908 are provided on the inner wall of the slide groove 902. Through the arrangement of the slide groove 902, slider 902, and adjustment holes 908, a precise and stable operating structure is provided for fin spacing adjustment. The size design of the slider 903 adapted to the slide groove 902 ensures that the slider 903 will not wobble due to excessive gap during sliding, affecting the fin spacing adjustment accuracy, nor will it jam due to excessive tightness, ensuring smooth adjustment operation. Multiple sets of adjustment holes 908 provide multiple fixed points for the slider 903, allowing users to flexibly adjust the fin spacing according to heat dissipation requirements. When the slider 903 moves to the appropriate position, the locking block 907 engages with the adjustment hole 908 to firmly lock the slider 903, preventing fin spacing changes due to vibration during equipment operation and ensuring the stability and reliability of heat dissipation.

[0027] Furthermore, the slider 903, drive motor 909, and rotating shaft 910 are evenly distributed in multiple sets inside the slide groove 902. The fin mounting brackets 911 are evenly distributed in three sets on the surface of the rotating shaft 910, and each set of fin mounting brackets 911 has multiple sets of fins 912 mounted on its surface. Through the arrangement of the fin mounting brackets 911 and fins 912, the heat dissipation efficiency and flexibility of the condenser are significantly improved. The multiple evenly distributed fin mounting brackets 911, in conjunction with the drive motor 909, allow for multi-angle rotation adjustment of the fins 912, facilitating optimized airflow. The airflow path improves the contact efficiency between air and fins 912, while the multiple sets of fins 912 installed on each set of fin mounting brackets 911 significantly increase the heat dissipation area and enhance the overall heat dissipation capacity. In addition, the modular design of the fin mounting brackets 911 facilitates disassembly and maintenance. When a set of fins 912 becomes dusty or damaged, the corresponding mounting bracket can be quickly disassembled for cleaning or replacement, reducing maintenance costs and difficulty. At the same time, the number of fin mounting brackets 911 and fins 912 can be flexibly increased or decreased according to actual heat dissipation needs, enhancing the adaptability of the condenser.

[0028] Working principle: After the device is started, the refrigerant flows in the condenser tube 8. The high-temperature and high-pressure gaseous refrigerant exchanges heat with the external environment in the condenser tube 8. The fins 912 increase the heat dissipation area and improve the heat dissipation efficiency. At this time, air enters the interior of the housing 3 through the vent plate 209 and flows through the gaps between the fins 912, carrying away heat. The cold air is discharged from the air outlet 6, forming an air circulation to help dissipate heat from the refrigerant in the condenser tube 8. When the ambient temperature or heat dissipation demand changes, the adjustment mechanism 9 comes into play. If it is necessary to adjust the spacing of the fins 912, the user manually pushes the slider 903 to slide in the slide groove 902. Due to the guiding effect of the slide groove 902 on the slider 903, the slider 903 drives the drive motor 909, the rotating shaft 910, and the fins. The mounting brackets 911 and fins 912 move synchronously, changing the distance between adjacent fin mounting brackets 911 and thus adjusting the spacing of the fins 912. During the sliding process, the second spring 905, the limiting plate 906, and the locking block 907 within the telescopic hole 904 work together. When the slider 903 moves to the appropriate position, the second spring 905 pushes the limiting plate 906, causing the locking block 907 to engage in the adjusting hole 908, fixing the slider 903 and ensuring that the spacing of the fins 912 remains stable, meeting the heat dissipation requirements under different operating conditions. If it is necessary to change the angle of the fins 912, the drive motor 909 is started. The output end of the drive motor 909 drives the rotating shaft 910 to rotate, and the fin mounting brackets 911 connected to the rotating shaft 910 rotate synchronously, fixing the fins 912. The fins 912 on the mounting bracket 911 also change their angle accordingly. By controlling the number of rotations of the drive motor 909, the time, or feedback from the angle sensor, the rotation angle of the fins 912 can be precisely adjusted to make the fins 912 form the optimal angle with the airflow direction, thereby increasing the contact area and heat exchange efficiency between the air and the fins 912 and further optimizing the heat dissipation effect. In the entire installation and operation process of the device, the positioning mechanism 2 plays a key role. During installation, according to the actual installation space and equipment matching requirements, the stop block 206 is pulled outward to disengage the fixing rod 207 from the positioning hole 204. The first spring 205 is stretched, and the positioning rod 203 can slide up and down in the base 201. Adjusting the height of the positioning rod 203 changes the height of the support plate 208, thus adjusting the shell. After adjusting body 3 to the appropriate position, release stop 206. The elastic restoring force of the first spring 205 causes stop 206 to move inward, and fixing rod 207 is reinserted into positioning hole 204. Positioning rod 203 is fixed, and support plate 208 is also locked, ensuring that housing 3 is stably installed above support plate 208 and vent plate 209. During device operation, the four sets of bases 201 and positioning rods 203 of positioning mechanism 2 are symmetrically distributed. Precise dimensional matching allows positioning rod 203 to rise and fall vertically within base 201, avoiding tilting or shaking, evenly distributing the weight of housing 3 and internal components, preventing excessive local stress that could lead to structural deformation, maintaining the normal working posture of condenser tube 8 and fins 912, and enhancing the versatility and stability of the equipment.Dustproof plate 7 is installed inside the air outlet 6 to prevent larger debris from entering the housing 3, protecting components such as the condenser tube 8 and fins 912, while not obstructing normal airflow and ensuring smooth heat dissipation. This completes the application of a condenser heat dissipation structure with adjustable fin spacing.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A condenser heat dissipation structure with adjustable fin spacing, comprising a mounting plate (1), characterized in that: A positioning mechanism (2) is provided above the mounting plate (1). A housing (3) is provided on the surface of the positioning mechanism (2). A cover plate (4) is installed on the surface of the housing (3). The cover plate (4) is connected to the housing (3) by a mounting bolt (5). An air outlet (6) is provided on the surface of the cover plate (4). A dustproof plate (7) is installed on the inner side of the air outlet (6). A condenser pipe (8) is installed inside the housing (3). An adjustment mechanism (9) is provided inside the housing (3). The adjusting mechanism (9) includes an adjusting frame (901), which is installed at both the upper and lower ends inside the housing (3). A groove (902) is formed on the surface of the adjusting frame (901), and a slider (903) is slidably connected inside the groove (902). A telescopic hole (904) is formed inside the slider (903), and a second spring (905) is connected to the inner end of the telescopic hole (904). The outer end of the second spring (905) is connected to a limiting device. Position plate (906), the outer end of the limiting plate (906) is connected to a locking block (907), the inner side of the slide groove (902) is provided with an adjustment hole (908), a drive motor (909) is installed above the slider (903), the output end of the drive motor (909) is connected to a rotating shaft (910), a fin mounting bracket (911) is installed on the surface of the rotating shaft (910), and fins (912) are installed on the surface of the fin mounting bracket (911).

2. The condenser heat dissipation structure with adjustable fin spacing according to claim 1, characterized in that: The positioning mechanism (2) includes a base (201), the bottom of which is fixedly connected to the top of the mounting plate (1). A fixing hole (202) is provided on one side surface of the base (201). A positioning rod (203) is slidably connected inside the base (201). A positioning hole (204) is provided on the surface of the positioning rod (203). A first spring (205) is connected to the outside of the fixing hole (202). A stop block (206) is connected to the outer end of the first spring (205). A fixing rod (207) is connected to the inner end of the stop block (206). A support plate (208) is connected to the top of the positioning rod (203). A vent plate (209) is installed on the inner side of the support plate (208). The housing (3) is installed on the upper surface of the support plate (208) and the vent plate (209).

3. The condenser heat dissipation structure with adjustable fin spacing according to claim 2, characterized in that: The outer wall dimension of the positioning rod (203) matches the inner wall dimension of the base (201). The base (201) and the positioning rod (203) are provided with four identical sets, which are symmetrically distributed around the central axis of the mounting plate (1).

4. The condenser heat dissipation structure with adjustable fin spacing according to claim 2, characterized in that: The positioning holes (204) are provided in multiple sets at equal intervals on the surface of the positioning rod (203), and the position of each set of positioning holes (204) corresponds to the position of the fixing hole (202).

5. A condenser heat dissipation structure with adjustable fin spacing according to claim 2, characterized in that: The stop block (206) is connected to the fixing rod (207) by the first spring (205) to form a telescopic structure. The size of the fixing rod (207) matches the size of the fixing hole (202) and the positioning hole (204).

6. The condenser heat dissipation structure with adjustable fin spacing according to claim 1, characterized in that: The size of the slider (903) is adapted to the size of the groove (902), and the adjustment holes (908) are provided in multiple identical sets on the inner wall of the groove (902).

7. The condenser heat dissipation structure with adjustable fin spacing according to claim 1, characterized in that: The slider (903), drive motor (909) and rotating shaft (910) are distributed in multiple sets at equal intervals inside the slide groove (902). The fin mounting bracket (911) is distributed in three sets at equal intervals on the surface of the rotating shaft (910), and each set of fin mounting bracket (911) has multiple sets of fins (912) mounted on its surface.

Images