Dustproof heat dissipation device for power distribution cabinet
By designing a dust-proof heat dissipation device and using fans and filtering mechanisms to achieve rapid and uniform heat dissipation and dust prevention of the distribution cabinet, the problem of damage to the distribution cabinet due to dust and moisture is solved, ensuring the cleanliness and life of the power components.
Patent Information
- Application Number
- CN202510975989.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-16
- Publication Date
- 2025-09-05
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing power distribution cabinets have poor dustproof effects, which can lead to damage to power components, especially when used outdoors, as large amounts of dust enter the heat dissipation holes, accelerating damage.
A dust-proof heat dissipation device is designed, including a fan, an air intake pipe, a filtering mechanism and a shielding mechanism. Air is extracted through an exhaust pipe and discharged after filtering. The baffle is automatically adjusted to prevent water in rainy days, and the flushing mechanism cleans the filter screen, thereby achieving rapid and uniform heat dissipation and dust prevention.
It achieves rapid and uniform heat dissipation and dust prevention effects inside the distribution cabinet, ensures the cleanliness and life of power components, and prevents dust and moisture from entering.
Smart Images

Figure CN120601301A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of power distribution cabinets, and in particular to a dust-proof and heat-dissipating device for a power distribution cabinet. Background Art
[0002] Distribution cabinets (boxes) are divided into power distribution cabinets (boxes), lighting distribution cabinets (boxes), and metering cabinets (boxes). They are the final equipment of the power distribution system. Distribution cabinets are a general term for motor control centers. Distribution cabinets are used in situations where the load is relatively dispersed and there are fewer circuits; motor control centers are used in situations where the load is concentrated and there are more circuits. They distribute the electrical energy of a circuit of the upper-level distribution equipment to the nearest load. This level of equipment should provide protection, monitoring, and control for the load;
[0003] Existing distribution cabinets for power distribution network switches have poor dust protection. Dust is more harmful to power components than any other pollutants. Therefore, the power components inside traditional distribution cabinets will be damaged after a period of use. Due to the large amount of dust falling inside, some power components will be damaged, causing the entire equipment to lose function and wasting resources. This is especially true for outdoor distribution cabinets. During use, due to the high heat dissipation requirements, a large amount of dust will enter the heat dissipation holes, which will accelerate damage.
[0004] Therefore, it is necessary to design a dust-proof heat dissipation device for a power distribution cabinet that is highly practical and can prevent excessive dust from accumulating inside the power distribution cabinet. Summary of the Invention
[0005] The object of the present invention is to provide a dust-proof and heat-dissipating device for a power distribution cabinet to solve the problems raised in the above-mentioned background technology.
[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a dust-proof and heat-dissipating device for a distribution cabinet, comprising a distribution cabinet body, the upper side of the distribution cabinet body is open, and the upper inner wall of the distribution cabinet body is fixedly connected to an upper baffle, the rear side of the distribution cabinet body is fixedly connected to a fan, the output end of the fan is fixedly connected to an air intake pipe, the other end of the air intake pipe passes through the upper baffle and is connected to the interior of the distribution cabinet body, the input end of the fan is fixedly connected to an exhaust pipe, the lower side of the exhaust pipe is provided with a filtering mechanism, and the upper side of the distribution cabinet body is provided with a shielding mechanism. When the fan is working, air is extracted through the exhaust pipe and then discharged into the interior of the distribution cabinet body through the air intake pipe. After entering the interior of the distribution cabinet body, the airflow will diffuse outward and move upward after diffusion, so that the heat inside the distribution cabinet body is quickly and evenly discharged to the outside, thereby achieving the purpose of quickly dissipating the heat inside the distribution cabinet body.
[0007] According to the above technical solution, the shielding mechanism includes a spring sleeve, the lower end of the spring sleeve is fixedly connected to the upper surface of the distribution cabinet body, the upper side of the spring sleeve is open, and a spring is provided at the bottom of the inner wall of the spring sleeve, the lower end of the spring is fixedly connected to the lower side of the inner wall of the spring sleeve, the upper end of the spring is fixedly connected to a plug rod, the outer wall of the plug rod contacts the inner wall of the spring sleeve, the upper end of the plug rod extends to the outside of the upper side of the spring sleeve, the upper end of the plug rod is fixedly connected to a baffle, the middle part of the baffle bulges upward, and the baffle is located on the upper side of the air inlet pipe, and the front side of the upper surface of the baffle is fixedly connected to a sponge, so that when it rains, the baffle will drop to shield the upper side of the distribution cabinet body, thereby preventing rainwater from entering the interior of the distribution cabinet body.
[0008] According to the above technical solution, the top-view area of the baffle is larger than the top-view area of the distribution cabinet body, and the left side and the right side of the upper surface of the baffle are inclined. The front height of the left and right sides of the upper surface of the baffle is greater than the rear height of the left and right sides of the upper surface of the baffle, which facilitates the discharge of rainwater and prevents water accumulation on the upper side of the baffle.
[0009] According to the above technical solution, the filtering mechanism includes a semicircular block, the outer wall of the semicircular block is a semi-cylindrical structure, and a mounting opening is provided on the rear side of the distribution cabinet body, the rear part of the outer wall of the semicircular block is fixedly connected to the inner wall of the mounting opening, a semicircular groove is provided in the middle part of the rear side of the semicircular block, and the rear outer wall of the distribution cabinet body is also fixedly connected to a bracket, and the bracket is located at the lower side of the exhaust pipe, the inner wall of the bracket is rotatably connected to a rotating rod through a bearing, the lower end of the rotating rod is conical, and the lower side of the rotating rod is also provided with a toothed structure, the upper end of the rotating rod is fixedly connected to a mounting plate, the rear side of the mounting plate extends to the semicircular groove inside the semicircular block, and the mounting The front and rear sides of the plate are provided with through holes running through from top to bottom, and the inner walls of the through holes on the front and rear sides of the mounting plate are fixedly connected with a first filter screen and a second filter screen respectively. The front side of the upper surface of the mounting plate contacts the lower surface of the exhaust pipe, and the diameter of the exhaust pipe is larger than the diameter of the first filter screen. The first filter screen is located in the middle of the lower side of the exhaust pipe. The lower rear side of the power distribution cabinet body is fixedly connected to a motor, and the output end of the motor is fixedly connected to a bevel gear. The upper side of the outer wall of the bevel gear is meshed with the lower end of the rotating rod, and a flushing mechanism is provided on the outer side of the semicircular block. When in use, the first filter screen and the second filter screen can be used to filter the lower side of the exhaust pipe in turn to ensure the cleanliness of the extracted gas.
[0010] According to the above technical solution, the lower surface of the first filter screen and the lower surface of the mounting plate are located in the same plane, and the lower surface of the mounting plate contacts the bottom of the inner wall of the semicircular groove in the middle part of the semicircular block, so that when the first filter screen and the second filter screen enter the interior of the semicircular groove in turn, the pollutants adhering to the semicircular groove can be scraped off by the lower side of the inner wall of the semicircular groove.
[0011] According to the above technical solution, the flushing mechanism includes a water trough, the outer wall of the water trough is fixedly connected to the rear side of the outer wall of the distribution cabinet body, the upper side of the inner wall of the water trough is fixedly connected with a third filter, the front lower part of the water trough is fixedly connected to the rear side of the semicircular block, the inner upper side of the semicircular block and the inner lower side of the semicircular block are respectively provided with a water inlet chamber and a drainage chamber, the lower side of the water inlet chamber is connected to the middle part of the semicircular groove, and the upper side of the drainage chamber is connected to the middle part of the semicircular groove, and the rear side of the water inlet chamber is connected to the inner lower side of the water trough, and the rear side of the drainage chamber is connected to the outside of the semicircular block.
[0012] Compared with the prior art, the present invention has the following beneficial effects: by providing a distribution cabinet body, a fan, an air inlet pipe and other structures, the present invention allows air to be ejected into the interior of the distribution cabinet body, thereby evenly removing the heat inside the distribution cabinet body, thereby achieving the effect of cooling the interior of the distribution cabinet body;
[0013] By providing a shielding mechanism, the device can increase the distance between the baffle and the distribution cabinet body on sunny days to facilitate better heat dissipation, and reduce the distance between the baffle and the distribution cabinet body on rainy days to prevent water from entering the distribution cabinet body, thereby ensuring that the upper side of the distribution cabinet body is clean while allowing heat to dissipate upwards better;
[0014] By providing a filtering mechanism, the device can filter the airflow at the lower end of the exhaust pipe while cleaning the first filter and the second filter, thereby preventing the first filter and the second filter from adhering too much dust and causing a decrease in airflow, thereby ensuring the cleanliness and heat dissipation effect inside the power distribution cabinet body;
[0015] By providing a flushing mechanism, in rainy weather, rainwater will flow into the interior of the water tank along the third filter, and then the water flow will converge and be discharged into the interior of the water inlet cavity through the lower side of the water tank. The water flow flushing the second filter will cause the dust and other debris contaminated on the surface of the second filter during the previous filtration to be washed off, thereby making the first filter and the second filter receive a better cleaning effect when in use, thereby ensuring the heat dissipation and cleaning inside the distribution cabinet body. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;
[0018] Figure 2 It is a schematic diagram of the rear structure of the present invention;
[0019] Figure 3 This is a schematic diagram of the internal structure of the power distribution cabinet body of the present invention;
[0020] Figure 4 It is a partial structural schematic diagram of the present invention;
[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the semicircular block of the present invention;
[0022] Figure 6 It is a schematic diagram of the disassembled structure of the shielding mechanism of the present invention;
[0023] Figure 7 It is a schematic structural diagram of the filtering mechanism of the present invention;
[0024] In the figure: 1. Distribution cabinet body; 2. Upper baffle; 3. Fan; 4. Air inlet pipe; 5. Exhaust pipe; 6. Shielding mechanism; 7. Filtering mechanism; 601. Spring sleeve; 602. Spring; 603. Insert rod; 604. Baffle; 605. Sponge; 701. Semicircular block; 702. Bracket; 703. Rotating rod; 704. Mounting plate; 705. First filter; 706. Second filter; 707. Motor; 708. Bevel gear; 709. Flushing mechanism; 901. Water tank; 902. Third filter; 903. Water inlet chamber; 904. Drain chamber. DETAILED DESCRIPTION
[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.
[0026] See also Figure 1-7 The present invention provides a technical solution: a dust-proof and heat-dissipating device for a power distribution cabinet, comprising a power distribution cabinet body 1, the upper side of the power distribution cabinet body 1 is open, and an upper baffle 2 is fixedly connected to the inner wall of the upper side of the power distribution cabinet body 1, a fan 3 is fixedly connected to the rear side of the power distribution cabinet body 1, the output end of the fan 3 is fixedly connected to an air intake pipe 4, the other end of the air intake pipe 4 passes through the upper baffle 2 and is connected to the interior of the power distribution cabinet body 1, the input end of the fan 3 is fixedly connected to an exhaust pipe 5, a filtering mechanism 7 is provided on the lower side of the exhaust pipe 5, and a shielding mechanism 6 is provided on the upper side of the power distribution cabinet body 1;
[0027] When in use, the fan 3 works to extract air through the exhaust pipe 5, and the air flow is discharged into the interior of the distribution cabinet body 1 through the air inlet pipe 4. After the air flow is blown out to the lower side of the middle part of the distribution cabinet body 1, it will diffuse to the inner periphery of the distribution cabinet body 1, and then be discharged outward through the holes in the upper baffle 2, thereby quickly removing the heat inside the distribution cabinet body 1 and controlling the internal temperature of the distribution cabinet body 1;
[0028] The shielding mechanism 6 includes a spring sleeve 601, the lower end of the spring sleeve 601 is fixedly connected to the upper surface of the distribution cabinet body 1, the upper side of the spring sleeve 601 is open, and a spring 602 is provided at the bottom of the inner wall of the spring sleeve 601, the lower end of the spring 602 is fixedly connected to the lower side of the inner wall of the spring sleeve 601, and the upper end of the spring 602 is fixedly connected to the insertion rod 603, the outer wall of the insertion rod 603 contacts the inner wall of the spring sleeve 601, and the upper end of the insertion rod 603 extends to the upper surface of the spring sleeve 601. On the outside of the side, the upper end of the plug rod 603 is fixedly connected to a baffle 604, the middle part of the baffle 604 is raised upward, and the baffle 604 is located on the upper side of the air inlet pipe 4, and the front side of the upper surface of the baffle 604 is fixedly connected to a sponge 605. The top view area of the baffle 604 is larger than the top view area of the power distribution cabinet body 1, and the left and right sides of the upper surface of the baffle 604 are inclined. The front height of the left and right sides of the upper surface of the baffle 604 is greater than the rear height of the left and right sides of the upper surface of the baffle 604;
[0029] During the process of rapid heat dissipation from the internal part of the power distribution cabinet body 1 through the upper baffle 2, the baffle 604 blocks external debris, preventing the debris from blocking the upper baffle 2. In addition, in rainy weather, the outer side of the power distribution cabinet body 1 is affected by moisture, which will reduce the overall temperature of the power distribution cabinet body 1. In order to prevent water from entering the interior of the power distribution cabinet body 1, the weight of the sponge 605 increases due to moisture, which will cause the baffle 604 to drop, causing the insertion rod 603 to retract into the interior of the spring sleeve 601, causing the spring 602 to deform and store energy, thereby shortening the distance between the baffle 604 and the upper baffle 2, preventing moisture from entering the interior of the power distribution cabinet body 1.
[0030] The filtering mechanism 7 includes a semicircular block 701, the outer wall of the semicircular block 701 is a semi-cylindrical structure, and a mounting port is provided on the rear side of the distribution cabinet body 1, the rear part of the outer wall of the semicircular block 701 is fixedly connected to the inner wall of the mounting port, a semicircular groove is provided in the middle part of the rear side of the semicircular block 701, and the rear outer wall of the distribution cabinet body 1 is also fixedly connected to a bracket 702, and the bracket 702 is located at the lower side of the exhaust pipe 5, the inner wall of the bracket 702 is rotatably connected to a rotating rod 703 through a bearing, the lower end of the rotating rod 703 is conical, and the lower side of the rotating rod 703 is also provided with a toothed structure, the upper end of the rotating rod 703 is fixedly connected to a mounting plate 704, the rear side of the mounting plate 704 extends to the semicircular groove inside the semicircular block 701, and the front and rear sides of the mounting plate 704 are provided with through-holes running up and down. Hole, and the inner walls of the through-hole on the front and rear sides of the mounting plate 704 are fixedly connected with the first filter screen 705 and the second filter screen 706 respectively. The front side of the upper surface of the mounting plate 704 contacts the lower surface of the exhaust pipe 5, and the diameter of the exhaust pipe 5 is larger than the diameter of the first filter screen 705. The first filter screen 705 is located in the middle of the lower side of the exhaust pipe 5. The lower rear side of the power distribution cabinet body 1 is fixedly connected to the motor 707, and the output end of the motor 707 is fixedly connected to the bevel gear 708. The upper side of the outer wall of the bevel gear 708 is meshed with the lower end of the rotating rod 703, and a flushing mechanism 709 is provided on the outer side of the semicircular block 701. The lower surface of the first filter screen 705 and the lower surface of the mounting plate 704 are located in the same plane, and the lower surface of the mounting plate 704 contacts the bottom of the inner wall of the semicircular groove in the middle part of the semicircular block 701;
[0031] When the exhaust pipe 5 is exhausting air, the air flow first passes through the lower side of the first filter screen 705, and the dust in the air will be filtered by the first filter screen 705. After being filtered, the air flow enters the interior of the distribution cabinet body 1 to ensure the cleanliness of the interior of the distribution cabinet body 1. After long-term use, when there is too much dirt adhering to the surface of the first filter screen 705, the motor 707 is started to make the motor 707 drive the bevel gear 708 to rotate, and then the bevel gear 708 drives the rotating rod 703 to rotate, so that the mounting plate 704 rotates synchronously with the rotating rod 703, and then the second filter screen 706 is rotated to the lower side of the exhaust pipe 5 to continue the filtering operation. When the lower side of the first filter screen 705 moves into the interior of the semicircular groove, the dirt adhering to the lower side will be scraped off by the inner wall of the semicircular groove, thereby ensuring that the lower side of the exhaust pipe 5 is always kept clean, thereby achieving better dust-proof and heat dissipation effects;
[0032] The flushing mechanism 709 includes a water trough 901, the outer wall of the water trough 901 is fixedly connected to the rear side of the outer wall of the power distribution cabinet body 1, and a third filter screen 902 is fixedly connected to the upper side of the inner wall of the water trough 901. The front lower part of the water trough 901 is fixedly connected to the rear side of the semicircular block 701. The inner upper side of the semicircular block 701 and the inner lower side of the semicircular block 701 are respectively provided with a water inlet chamber 903 and a drainage chamber 904. The lower side of the water inlet chamber 903 is connected to the middle part of the semicircular groove, and the upper side of the drainage chamber 904 is connected to the middle part of the semicircular groove, and the rear side of the water inlet chamber 903 is connected to the inner lower side of the water trough 901, and the rear side of the drainage chamber 904 is connected to the outside of the semicircular block 701;
[0033] During rainy weather, rainwater flows through the third filter screen 902 into the water tank 901, and then the water flows together and flows into the water inlet chamber 903 through the lower side of the water tank 901. The water flows through the second filter screen 706, and the dust and other debris on the surface of the second filter screen 706 during the previous filtration are washed away, thereby achieving a better cleaning effect on the first filter screen 705 and the second filter screen 706 during use, thereby ensuring heat dissipation and cleanliness inside the power distribution cabinet body 1.
[0034] And because the upper surface of the baffle 604 is inclined, the rainwater on the upper side of the baffle 604 will impact the surface of the third filter 902 after falling, so that the surface of the third filter 902 is cleaned, thereby preventing the upper side of the third filter 902 from being blocked by debris, thereby ensuring the cleaning effect.
[0035] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.
[0036] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.
Claims
1. A dustproof and heat dissipation device for a power distribution cabinet, comprising a power distribution cabinet body (1), characterized in that: The upper side of the power distribution cabinet body (1) is open, and the upper inner wall of the power distribution cabinet body (1) is fixedly connected to an upper baffle (2), the rear side of the power distribution cabinet body (1) is fixedly connected to a fan (3), the output end of the fan (3) is fixedly connected to an air intake pipe (4), the other end of the air intake pipe (4) passes through the upper baffle (2) and is connected to the interior of the power distribution cabinet body (1), the input end of the fan (3) is fixedly connected to an exhaust pipe (5), the lower side of the exhaust pipe (5) is provided with a filtering mechanism (7), and the upper side of the power distribution cabinet body (1) is provided with a shielding mechanism (6).
2. The dust-proof and heat-dissipating device for a power distribution cabinet according to claim 1, characterized in that: The shielding mechanism (6) includes a spring sleeve (601), the lower end of the spring sleeve (601) is fixedly connected to the upper surface of the power distribution cabinet body (1), the upper side of the spring sleeve (601) is open, and a spring (602) is provided at the bottom of the inner wall of the spring sleeve (601), the lower end of the spring (602) is fixedly connected to the lower side of the inner wall of the spring sleeve (601), and the upper end of the spring (602) is fixedly connected to the insertion rod (60 3), the outer wall of the insertion rod (603) contacts the inner wall of the spring sleeve (601), the upper end of the insertion rod (603) extends to the upper side of the spring sleeve (601), the upper end of the insertion rod (603) is fixedly connected to a baffle (604), the middle part of the baffle (604) is raised upward, and the baffle (604) is located on the upper side of the air intake pipe (4), and the front side of the upper surface of the baffle (604) is fixedly connected to a sponge (605).
3. The dust-proof and heat-dissipating device for a power distribution cabinet according to claim 2, characterized in that: The top-view area of the baffle (604) is larger than the top-view area of the power distribution cabinet body (1), and the left side and the right side of the upper surface of the baffle (604) are inclined, and the front height of the left and right sides of the upper surface of the baffle (604) is larger than the rear height of the left and right sides of the upper surface of the baffle (604).
4. The dust-proof and heat-dissipating device for a power distribution cabinet according to claim 3, characterized in that: The filtering mechanism (7) comprises a semicircular block (701), the outer wall of the semicircular block (701) is a semi-cylindrical structure, and a mounting opening is provided on the rear side of the power distribution cabinet body (1), the rear portion of the outer wall of the semicircular block (701) is fixedly connected to the inner wall of the mounting opening, a semicircular groove is provided in the middle portion of the rear side of the semicircular block (701), and the rear outer wall of the power distribution cabinet body (1) is also fixedly connected to a bracket (702), and the bracket (702) is located on the lower side of the exhaust pipe (5), the inner wall of the bracket (702) is rotatably connected to a rotating rod (703) through a bearing, the lower end of the rotating rod (703) is conical, and the lower side of the rotating rod (703) is also provided with a toothed structure, the upper end of the rotating rod (703) is fixedly connected to a mounting plate (704), and the rear side of the mounting plate (704) extends to the semicircular block (7 01), the front and rear sides of the mounting plate (704) are provided with through holes that pass through the upper and lower parts, and the inner walls of the through holes on the front and rear sides of the mounting plate (704) are fixedly connected with a first filter (705) and a second filter (706), respectively. The front side of the upper surface of the mounting plate (704) contacts the lower surface of the exhaust pipe (5), and the diameter of the exhaust pipe (5) is larger than the diameter of the first filter (705). The first filter (705) is located in the middle of the lower side of the exhaust pipe (5). The lower side of the rear part of the distribution cabinet body (1) is fixedly connected with a motor (707), and the output end of the motor (707) is fixedly connected with a bevel gear (708). The upper side of the outer wall of the bevel gear (708) is meshed with the lower end of the rotating rod (703), and a flushing mechanism (709) is provided on the outer side of the semicircular block (701).
5. The dust-proof and heat-dissipating device for a power distribution cabinet according to claim 4, characterized in that: The lower surface of the first filter screen (705) and the lower surface of the mounting plate (704) are located in the same plane, and the lower surface of the mounting plate (704) contacts the bottom of the inner wall of the semicircular groove in the middle of the semicircular block (701).
6. The dust-proof and heat-dissipating device for a power distribution cabinet according to claim 5, characterized in that: The flushing mechanism (709) comprises a water trough (901), the outer wall of the water trough (901) is fixedly connected to the rear side of the outer wall of the power distribution cabinet body (1), the upper side of the inner wall of the water trough (901) is fixedly connected to a third filter (902), the front lower part of the water trough (901) is fixedly connected to the rear side of the semicircular block (701), the inner upper side of the semicircular block (701) and the inner lower side of the semicircular block (701) are respectively provided with a water inlet chamber (903) and a drainage chamber (904), the lower side of the water inlet chamber (903) is connected to the middle part of the semicircular groove, and the upper side of the drainage chamber (904) is connected to the middle part of the semicircular groove, and the rear side of the water inlet chamber (903) is connected to the inner lower side of the water trough (901), and the rear side of the drainage chamber (904) is connected to the outside of the semicircular block (701).