Boiler blowdown device

Abstract

A boiler blowdown device comprises an outer valve and an inner valve which are connected through a pipeline, the outer valve and the inner valve are each connected with a driving device fixed to a rack, each driving device comprises a base, the two sides of each base are rotationally connected with a rotating disc and a support respectively, and an output shaft in the middle of each rotating disc is connected with the outer valve or the inner valve. An input shaft in the middle of the support is connected with a motor output shaft, an adjusting nut is connected to the input shaft in a threaded mode, an adjusting sleeve is arranged on the side, close to the rotary disc, of the adjusting nut and slidably connected with the input shaft, the adjusting sleeve is connected with at least one supporting seat through a connecting rod, and friction plates are arranged on the supporting seats and in friction connection with the rotary disc. A sensor is arranged on the rear side of the rotary disc, when the rotary disc and the support rotate relatively, the pin is continuously jacked up by the support, and the sensor senses jacking-up of the pin. The product is used for boiler blowdown.

Description

Technical Field

[0001] This utility model relates to the field of boilers, and in particular to a boiler blowdown device. Background Technology

[0002] The main function of a boiler blowdown system is to remove accumulated impurities and deposits from the boiler, such as sludge, scale, rust, and calcium and magnesium flocculent precipitates from incomplete desalination. This maintains the cleanliness of the boiler water and prevents boiler efficiency decline and safety hazards caused by scale, corrosion, and other problems. At the same time, blowdown is also an important means of adjusting boiler water quality and ensuring steam quality.

[0003] The boiler blowdown system mainly consists of a blowdown pipe, a blowdown valve, and a blowdown conduit inside the boiler drum. Among these, the blowdown valve is a key component, controlling the opening and closing of the blowdown. For boilers with a large rated evaporation capacity or high operating pressure, two blowdown valves are usually installed in series on the blowdown pipe to improve their working conditions and extend their service life.

[0004] The general procedure for boiler blowdown is as follows:

[0005] 1. Preparation Phase: Ensure the boiler is at a high water level and low load, as this is the optimal time for blowdown. Simultaneously, check that the blowdown valves are intact and the blowdown pipes are unobstructed.

[0006] 2. Open the drain valve: First, open the slow drain valve (also known as the preheating valve or the first drain valve) to allow boiler water to flow out slowly, preheating and flushing the drain pipe. Then, gradually open the fast drain valve (also known as the second drain valve) to increase the drain volume. During the draining process, the fast drain valve can be opened and closed repeatedly several times to shake the scale at the bottom of the furnace and improve the draining effect.

[0007] 3. End of sewage discharge: Once the desired effect has been achieved, first close the fast-acting drain valve, then close the slow-acting drain valve. Next, briefly open the fast-acting drain valve again to discharge any remaining sewage between the drain valves. Finally, ensure all drain valves are tightly closed to prevent leakage.

[0008] Traditional sewage discharge systems generally employ manual and automatic methods. Manual sewage discharge presents several problems: first, safety concerns; second, it is labor-intensive and resource-intensive; and third, due to the complexity of the process, manual discharge is prone to errors and ineffective results. Automatic sewage discharge systems typically use motors to control the valve's opening and closing. However, the fixed valve opening and closing angle causes several issues: first, a small opening angle results in incomplete valve opening and closing, affecting discharge efficiency, and an incomplete closing angle leads to leakage; second, a large opening angle can cause motor stalling, damaging both the motor and the valve body. Utility Model Content

[0009] This utility model addresses the aforementioned shortcomings of the existing technology by providing a boiler blowdown device that solves the problems of water leakage and damage to the valve body and motor caused by incomplete valve opening or closing or excessive opening and closing angle during the blowdown process.

[0010] The objective of this utility model is achieved through the following technical solution:

[0011] A boiler blowdown device includes an outer valve and an inner valve connected by pipes. A drive unit fixed to a frame is connected to each of the outer and inner valves. The drive unit includes a base, with a turntable and a support rotatably connected to both sides of the base. An output shaft in the middle of the turntable is connected to either the outer or inner valve. An input shaft in the middle of the support is connected to a motor output shaft. An adjusting nut is threaded onto the input shaft. An adjusting sleeve is provided on the side of the adjusting nut near the turntable. The adjusting sleeve is slidably connected to the input shaft. The adjusting sleeve is connected to at least one support via a connecting rod. A friction plate is provided on the support, and the friction plate is in frictional contact with the turntable. A pin is slidably connected to the outer side of the turntable. A sensor is provided on the rear side of the turntable. When the turntable and the support rotate relative to each other, the pin is continuously pushed up by the support, and the sensor detects the pushing up of the pin.

[0012] The bracket has two symmetrical support seats on each side, and the support seat grooves on both sides of each support seat are slidably connected to the guide slider on the bracket.

[0013] The connecting rod is hinged to the support hinge hole in the middle of the support and the adjustment sleeve hinge hole at one end of the adjustment sleeve on both sides.

[0014] The adjusting sleeve has an adjusting sleeve hole in the middle, which is slidably connected to the input shaft. A No. 1 spring is provided between the adjusting sleeve and the bracket. The No. 1 spring is sleeved on the outside of the input shaft, and the two sides of the No. 1 spring abut against the end face of the bracket and the end face of the adjusting sleeve, respectively.

[0015] The turntable has a radial pin seat on its outer cylindrical surface, a pin seat hole in the middle of the pin seat, an axial groove in the pin seat hole, a pin in the pin seat hole, a cross pin at the bottom of the pin, the pin slidably connected to the pin seat hole, the cross pin slidably connected to the groove, a nut threadedly connected to the top of the pin seat, a second spring between the nut and the pin, the second spring being sleeved on the outside of the pin seat, the two sides of the second spring respectively abutting against the lower part of the nut and the upper part of the cross pin, the second spring pressing the pin downward.

[0016] The pin has a triangular wedge at the bottom. Normally, the wedge is inserted into the countersunk hole. When the turntable and the bracket rotate relative to each other, the guide slider of the bracket will contact the wedge, and the guide slider will lift the pin.

[0017] A sensor is installed on the rear side of the turntable. When the pin is lifted by the bracket, the horizontal pin and the end face of the sensor approach each other and generate a signal. When the turntable rotates continuously relative to the bracket, the sensor will continuously sense the pin and determine whether the valve body is open or closed in place based on this signal.

[0018] Beneficial effects: The adjusting sleeve and support of the sliding connection bracket are connected by a connecting rod. The friction plate fixed on the support and the turntable are in frictional connection. The friction between the friction plate and the turntable allows the bracket to drive the turntable to rotate. Rotating the adjusting nut can adjust the pressure and friction between the friction plate and the turntable, thereby changing the torque of the bracket transmission. This ensures the torque required for opening and closing the external or internal valve, and also allows the turntable to slide relative to the bracket when the external or internal valve is fully open or closed. Therefore, when the motor opens and closes the valve body, we can rotate the motor at an angle greater than the angle required for the valve body to open and close. This overcomes the problems of small valve opening and closing angles, incomplete valve opening and closing, affecting the sewage discharge effect and causing water leakage, while avoiding the problems of large valve opening and closing angles, which can damage the motor and valve body. When the valve body is fully open or closed, the turntable and the bracket rotate relative to each other, and the pin is continuously pushed up by the turntable. The sensor senses the continuous pushing up of the pin, and this signal is used to determine whether the valve body is fully open or closed. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the boiler blowdown device described in this utility model.

[0020] Figure 2 This is a schematic diagram of the drive device structure described in this utility model.

[0021] Figure 3 This is a schematic diagram of the turntable and support connection structure described in this utility model.

[0022] Figure 4 This is a schematic diagram of the turntable structure described in this utility model.

[0023] Figure 5 This is a schematic diagram of the support structure described in this utility model.

[0024] Figure 6 This is a schematic diagram of the adjusting sleeve structure described in this utility model.

[0025] Figure 7 This is a schematic diagram of the support structure described in this utility model.

[0026] Figure 8 This is a schematic diagram of the pin structure described in this utility model. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0028] A boiler blowdown device includes an outer valve 310 and an inner valve 320 connected by pipes. A drive unit 100 fixed to a frame 330 is connected to each of the outer valve 310 and the inner valve 320. The drive unit 100 includes a base 110, with a turntable 120 and a support 130 rotatably connected to both sides of the base 110. An output shaft 121 in the middle of the turntable 120 is connected to either the outer valve 310 or the inner valve 320. An input shaft 133 in the middle of the support 130 is connected to the output shaft of a motor 240. An adjusting nut 180 is threaded onto the input shaft 133. The mother 180 is provided with an adjusting sleeve 140 near the turntable 120. The adjusting sleeve 140 is slidably connected to the input shaft 133. The adjusting sleeve 140 is connected to at least one support 150 through a connecting rod 190. The support 150 is provided with a friction plate 170. The friction plate 170 is rubbed with the turntable 120. The outer side of the turntable 120 is slidably connected to a pin 160. A sensor 250 is provided on the rear side of the turntable 120. When the turntable 120 and the bracket 130 rotate relative to each other, the pin 160 is continuously pushed up by the bracket 130, and the sensor 250 senses the pushing up of the pin 160.

[0029] The bracket 130 has two symmetrical support seats 150 on each side, and the support seat grooves 151 on both sides of each support seat 150 are slidably connected to the guide slider 131 on the bracket 130.

[0030] The connecting rod 190 is hinged to the support hinge hole 152 in the middle of the support 150 and the adjustment sleeve hinge hole 142 at one end of the adjustment sleeve 140 on both sides.

[0031] The adjusting sleeve 140 has an adjusting sleeve hole 141 in the middle, and the adjusting sleeve hole 141 is slidably connected to the input shaft 133. A first spring 210 is provided between the adjusting sleeve 140 and the bracket 130. The first spring 210 is sleeved on the outside of the input shaft 133, and the two sides of the first spring 210 abut against the end face of the bracket 130 and the end face of the adjusting sleeve 140, respectively.

[0032] The turntable 120 has a radial pin seat 123 on the outer side of its cylindrical surface. The pin seat 123 has a pin seat hole 124 in the middle. The pin seat hole 124 has an axial groove 125. A pin 160 is provided in the pin seat hole 124. A horizontal pin 162 is provided at the bottom of the pin 160. The pin 160 is slidably connected to the pin seat hole 124. The horizontal pin 162 is slidably connected to the groove 125. A nut 230 is threadedly connected to the top of the pin seat 123. A second spring 220 is provided between the nut 230 and the pin 160. The second spring 220 is sleeved on the outside of the pin seat 123. The two sides of the second spring 220 abut against the lower part of the nut 230 and the upper part of the horizontal pin 162, respectively. The second spring 220 presses the pin 160 down.

[0033] The pin 160 has a triangular wedge 161 at its lower part. Normally, the wedge 161 is inserted into the countersunk hole 122. When the turntable 120 and the bracket 130 rotate relative to each other, the guide slider 131 of the bracket 130 will contact the wedge 161 and the guide slider 131 will lift the pin 160.

[0034] A sensor 250 is provided on the rear side of the turntable 120. When the pin 160 is lifted by the bracket 130, the horizontal pin 162 and the end face of the sensor 250 approach each other and generate a signal. When the turntable 120 rotates continuously relative to the bracket 130, the sensor 250 will continuously sense the pin 160 and determine whether the valve body is open or closed according to this signal.

[0035] refer to Figures 1 to 4 The device includes an outer valve 310 and an inner valve 320 connected by pipes. A drive device 100 fixed on a frame 330 is connected to the outer valve 310 and the inner valve 320 respectively. The drive device 100 includes a base 110 with two symmetrical support seats 111 on the left and right. A turntable 120 and a bracket 130 are rotatably connected to the two support seats 111 respectively. The output shaft 121 in the middle of the turntable 120 is connected to the drive shaft of the outer valve 310 or the inner valve 320. The input shaft 133 in the middle of the bracket 130 is connected to the output shaft of the motor 240. The motor 240 is fixed on the side of the corresponding support seat 111. The end face of the turntable 120 opposite to the output shaft 121 has a countersunk hole 122. The bracket 130 is in the countersunk hole 122.

[0036] refer to Figure 3 , Figure 7 The bracket 130 has one or more guide grooves 132 on both sides. Each guide groove 132 has two symmetrical guide sliders 131 on both sides. Each guide groove 132 has a support 150 in it. Each support 150 has two symmetrical support grooves 151 on both sides. Each support groove 151 is slidably connected to the guide slider 131 on the corresponding side.

[0037] refer to Figure 3 Each support 150 is connected to a friction plate 170 by adhesive or bolts on its outer side. The outer side of the friction plate 170 is arc-shaped, and the diameter of the arc on the outer side of the friction plate 170 is the same as the diameter of the arc on the inner side of the countersunk hole 122. The two friction plates 170 are frictionally connected to the inner side of the turntable 120.

[0038] refer to Figure 6 , Figure 7 The two support seats 150 are connected by connecting rods 190 and adjusting sleeves 140. Each support seat 150 has a support seat hinge hole 152 in the middle. One end of the adjusting sleeve 140 has two symmetrical adjusting sleeve hinge holes 142. The support seat hinge hole 152 and the adjusting sleeve hinge hole 142 are respectively hinged on both sides of each support seat 150.

[0039] refer to Figure 3 The adjusting sleeve 140 has an adjusting sleeve hole 141 in the middle, and the adjusting sleeve hole 141 is slidably connected to the input shaft 133. A first spring 210 is provided between the adjusting sleeve 140 and the bracket 130. The first spring 210 is sleeved on the outside of the input shaft 133, and the two sides of the first spring 210 abut against the end face of the bracket 130 and the end face of the adjusting sleeve 140, respectively.

[0040] refer to Figure 3 , Figure 5 The adjusting sleeve 140 is provided with an adjusting nut 180 on the side near the motor 240. The adjusting nut 180 and the input shaft 133 are threadedly connected by the input shaft thread 134.

[0041] When the adjusting nut 180 is rotated, it moves back and forth along the input shaft 133. When the adjusting nut 180 moves towards the side of the first spring 210, the bracket 130, through the connecting rods 190 on both sides, opens the support seats 150 on both sides, so that the friction plate 170 and the inner side of the turntable 120 maintain a certain pressure. The pressure on the inner side of the friction plate 170 and the turntable 120 generates friction between them. This friction allows the bracket 130 to drive the turntable 120 to rotate. Rotating the adjusting nut 180 simultaneously adjusts the friction between the friction plate 170 and the turntable 120. The magnitude of pressure and friction is adjusted to change the torque of the transmission of the bracket 130, so that the turntable 120 can adapt to the torque required for the opening and closing of the outer valve 310 or the inner valve 320. This ensures the opening and closing of the outer valve 310 or the inner valve 320, and also allows the turntable 120 to slide relative to the bracket 130 when the outer valve 310 or the inner valve 320 is fully opened or closed. Therefore, when the motor opens and closes the valve body, we can rotate the motor at an angle greater than the angle required for the valve body to open and close. This overcomes the problems of small valve opening and closing angles, incomplete valve opening and closing, affecting the sewage discharge effect and causing water leakage, while avoiding the problems of large valve opening and closing angles, which could damage the motor and the valve body.

[0042] refer to Figure 2 , Figure 4 , Figure 8A pin 160 is provided on the outer side of the turntable 120. A radial pin seat 123 is provided on the outer side of the cylindrical surface of the turntable 120. A pin seat hole 124 is provided in the middle of the pin seat 123. A waist groove 125 is provided axially in the pin seat hole 124. A pin 160 is provided in the pin seat hole 124. A horizontal pin 162 is provided at the bottom of the pin 160. The pin 160 is slidably connected to the pin seat hole 124. The horizontal pin 162 is slidably connected to the waist groove 125. A pin seat thread 126 is provided on the part of the pin seat 123. The pin seat thread 126 is threaded to connect to the nut 230. A second spring 220 is provided between the nut 230 and the pin 160. The second spring 220 is sleeved on the outside of the pin seat 123. The two sides of the second spring 220 respectively abut against the lower part of the nut 230 and the horizontal pin 162. 2. At the upper part, spring 220 presses pin 160 down. A triangular wedge 161 is provided at the lower part of pin 160. In normal state, wedge 161 is inserted into countersunk hole 122. When turntable 120 and bracket 130 rotate relative to each other, guide slider 131 of bracket 130 will contact wedge 161 and guide slider 131 will lift pin 160. Sensor 250 is provided on the rear side of turntable 120. When pin 160 is lifted by bracket 130, cross pin 162 and end face of sensor 250 approach each other and generate a signal. When turntable 120 rotates continuously relative to bracket 130, sensor 250 will continuously sense pin 160 and determine whether the valve body is open or closed according to this signal.

[0043] When using this device, when the motor 240 of the drive unit 100 rotates, it drives the bracket 130 to rotate. The bracket 130 drives the support 150 and friction plate 170 to rotate. The friction plate 170 drives the turntable 120 to rotate. The turntable 120 drives the valve body to rotate, realizing the opening and closing of the valve body. When the valve body is fully open or closed, the rotation of the turntable 120 is blocked. The bracket 130 and the turntable 120 rotate relative to each other. The pin 160 is continuously pushed up by the turntable 120. The sensor 250 senses the continuous pushing up of the pin 160. This signal is used to determine whether the valve body is fully open or closed. Rotating the adjusting nut 180 can... Adjusting the pressure and friction between the friction plate 170 and the turntable 120 changes the torque of the support 130 transmission. This ensures the torque required for the opening and closing of the outer valve 310 or the inner valve 320, and also allows the turntable 120 to slide relative to the support 130 when the outer valve 310 or the inner valve 320 is fully open or closed. Therefore, when the motor opens and closes the valve body, we can rotate the motor at an angle greater than the angle required for the valve body to open and close. This overcomes the problems of small valve opening and closing angles, incomplete valve opening and closing, affecting the sewage discharge effect and causing water leakage, while also avoiding the problem of large valve opening and closing angles, which could damage the motor and valve body.

Claims

1. A boiler blowdown device, characterized in that: The system includes an outer valve (310) and an inner valve (320) connected by pipes. A drive device (100) fixed to a frame (330) is connected to each of the outer valve (310) and the inner valve (320). The drive device (100) includes a base (110), with a turntable (120) and a bracket (130) rotatably connected to both sides of the base (110). An output shaft (121) in the middle of the turntable (120) is connected to either the outer valve (310) or the inner valve (320). An input shaft (133) in the middle of the bracket (130) is connected to the output shaft of a motor (240). An adjusting nut (180) is threaded onto the input shaft (133). An adjusting sleeve (140) is provided on the side near the turntable (120). The adjusting sleeve (140) is slidably connected to the input shaft (133). The adjusting sleeve (140) is connected to at least one support (150) through a connecting rod (190). A friction plate (170) is provided on the support (150). The friction plate (170) and the turntable (120) are rubbed together. A pin (160) is slidably connected to the outside of the turntable (120). A sensor (250) is provided on the rear side of the turntable (120). When the turntable (120) and the support (130) rotate relative to each other, the pin (160) is continuously pushed up by the support (130), and the sensor (250) senses the pushing up of the pin (160).

2. The boiler blowdown device according to claim 1, characterized in that: The bracket (130) has two symmetrical support seats (150) on both sides. The support seat grooves (151) on both sides of each support seat (150) are slidably connected to the guide slider (131) on the bracket (130).

3. A boiler blowdown device according to claim 1, characterized in that: The connecting rod (190) is hinged to the support hinge hole (152) in the middle of the support (150) and the adjustment sleeve hinge hole (142) at one end of the adjustment sleeve (140) on both sides.

4. A boiler blowdown device according to claim 1, characterized in that: The adjusting sleeve (140) has an adjusting sleeve hole (141) in the middle, and the adjusting sleeve hole (141) is slidably connected to the input shaft (133). A first spring (210) is provided between the adjusting sleeve (140) and the bracket (130). The first spring (210) is sleeved on the outside of the input shaft (133), and the two sides of the first spring (210) abut against the end face of the bracket (130) and the end face of the adjusting sleeve (140) respectively.

5. A boiler blowdown device according to claim 1, characterized in that: The turntable (120) has a radial pin seat (123) on the outer side of its cylindrical surface. The pin seat (123) has a pin seat hole (124) in the middle. The pin seat hole (124) has an axial groove (125). The pin seat hole (124) has a pin (160) in it. The bottom of the pin (160) has a horizontal pin (162). The pin (160) is slidably connected to the pin seat hole (124). The horizontal pin (162) is slidably connected to the groove (125). The top of the pin seat (123) is threadedly connected to a nut (230). A second spring (220) is provided between the nut (230) and the pin (160). The second spring (220) is sleeved on the outside of the pin seat (123). The two sides of the second spring (220) abut against the lower part of the nut (230) and the upper part of the horizontal pin (162) respectively. The second spring (220) presses the pin (160) down.

6. A boiler blowdown device according to claim 1, characterized in that: The pin (160) has a triangular wedge (161) at the bottom. Normally, the wedge (161) is inserted into the countersunk hole (122). When the turntable (120) and the bracket (130) rotate relative to each other, the guide slider (131) of the bracket (130) will contact the wedge (161) and the guide slider (131) will lift the pin (160).

7. A boiler blowdown device according to claim 1, characterized in that... A sensor (250) is provided on the rear side of the turntable (120). When the pin (160) is lifted by the bracket (130), the end face of the horizontal pin (162) and the sensor (250) approaches and generates a signal. When the turntable (120) rotates continuously relative to the bracket (130), the sensor (250) will continuously sense the pin (160). Based on this signal, it is determined whether the valve body is open or closed in place.

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