Quick hand-automatic blow-down valve for boiler

Abstract

This utility model relates to the field of boiler blowdown valve technology, and more particularly to a rapid manual / automatic blowdown valve for boilers. It includes a manual / automatic actuator, a valve seat, and a seal. The manual / automatic actuator adjusts the relative position of the valve seat and the seal, causing them to seal and abut against each other to close the blowdown valve, or to separate them to open the blowdown valve. A protective cover, cylindrical in shape, is fitted and fixed to the seal. Its top is sealed and fixedly connected to the seal, and its peripheral wall has a through hole. When the valve seat and the seal are separated, the bottom end of the protective cover separates from the valve seat, allowing large-diameter impurities to be discharged through the blowdown valve. During the process of the valve seat and the seal changing from a separated state to a sealed abutment state, this utility model ensures good sealing performance of the blowdown valve when closed, while avoiding wear on the seal and valve seat caused by large-diameter impurities getting stuck between them, thus extending the service life of the entire blowdown valve.

Description

Technical Field

[0001] This utility model relates to the technical field of boiler blowdown valves, specifically a boiler quick manual / automatic blowdown valve. Background Technology

[0002] During boiler operation, it is necessary to periodically or continuously discharge some boiler water, a process achieved through the boiler blowdown valve. During blowdown, the boiler water often contains impurities of various particle sizes, among which large-diameter impurities (such as larger particles of sediment and rust) pose a serious threat to the sealing performance of the blowdown valve.

[0003] Existing boiler blowdown valves typically operate by controlling the relative position between the seal and the valve seat to open and close, thereby controlling the discharge of wastewater. However, in practical use, it has been found that when the blowdown valve is about to close, before the seal and valve seat come into contact, existing blowdown valves lack an effective isolation device or structure to intercept and isolate large-diameter impurities in the wastewater. This results in large-diameter impurities easily entering the gap between the seal and the valve seat along with the wastewater at the moment the blowdown valve closes.

[0004] On the one hand, due to the large size of large-diameter impurities, they can get stuck between the seal and the valve seat, preventing the seal from fitting tightly against the valve seat. In this case, even if the drain valve is closed, sewage will still leak out through the gap between the seal and the valve seat, failing to achieve a good sealing effect. On the other hand, large-diameter impurities stuck between the seal and the valve seat will also cause wear to the seal and the valve seat, accelerating their aging and damage, and shortening their service life. Utility Model Content

[0005] The purpose of this invention is to provide a quick manual / automatic drain valve for boilers to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a boiler quick manual / automatic drain valve, including a manual / automatic actuator, a valve seat, and a seal. The manual / automatic actuator is used to adjust the relative position of the valve seat and the seal, so that the valve seat and the seal seal to close the drain valve, or to separate the valve seat and the seal to open the drain valve. A protective cover is fitted and fixed on the seal. The protective cover is cylindrical, and its top is sealed and fixedly connected to the seal. A through hole is provided on its peripheral wall. When the valve seat and the seal are in a separated state, the bottom end of the protective cover separates from the valve seat, and large-diameter impurities can be discharged through the drain valve; when the valve seat and the seal change from a separated state to a sealed contact state, the bottom end of the protective cover contacts the valve seat before the seal and the valve seat seal contact, and large-diameter impurities are blocked outside the protective cover.

[0007] Preferably, the top of the protective cover peripheral wall is provided with a bending elastic part, which is located above the through hole.

[0008] Preferably, a buffer sheet is fixed to the bottom of the protective cover's perimeter wall, and the interior of the buffer sheet gradually decreases in the vertical downward direction.

[0009] Preferably, a mounting block is fixedly connected to the top of the protective cover, and the protective cover is sealed and mounted on the sealing element by the mounting block.

[0010] Preferably, the manual / automatic actuator includes a bracket, a pneumatic actuator, a transmission rod, a return spring, and a handle. The pneumatic actuator is mounted on the top of the bracket, and the transmission rod slides through the top of the bracket. The return spring is sleeved on the outside of the transmission rod, and the two ends of the return spring abut against the bracket and the transmission rod respectively; The transmission rod connects the seal and the pneumatic actuator; The handle is hinged to the bracket, with one end located outside the bracket and the other end located on the drive rod.

[0011] Preferably, it also includes a valve cover, a valve body, and a valve core, with the valve cover fixedly mounted on the valve body, the valve core sliding seal penetrating through the valve cover, and the valve core fixedly connected between the sealing element and the transmission rod.

[0012] Preferably, the valve cover is fixedly mounted on the valve body by fastening bolts; The valve seat is pressed and fixed to the communication channel of the valve body by the valve cover; The seal and valve core are connected by threads.

[0013] Compared with the prior art, the beneficial effects of this utility model are: In use, when the valve seat and the seal are separated, the bottom end of the protective cover separates from the valve seat, allowing large-diameter impurities to be smoothly discharged through the drain valve. During the transition from a separated state to a sealed contact state, the bottom end of the protective cover contacts the valve seat before the seal and valve seat come into full contact. At this point, large-diameter impurities are blocked outside the protective cover and cannot enter between the seal and the valve seat, thus preventing large-diameter impurities from getting stuck between them. This ensures good sealing performance of the drain valve when closed and avoids wear on the seal and valve seat caused by large-diameter impurities, extending the overall service life of the drain valve. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the valve seat, sealing element and valve core of this utility model; Figure 3This is a schematic diagram of the structure of the sealing element, valve core, and protective cover of this utility model.

[0015] In the diagram: 1. Valve cover; 2. Valve body; 201. Inlet; 202. Outlet; 203. Connecting channel; 3. Valve seat; 4. Seal; 401. Screw hole; 5. Valve core; 501. Stud; 6. Protective cover; 601. Through hole; 602. Bending elastic part; 603. Buffer plate; 604. Mounting block; 7. Fastening bolt; 8. Bracket; 9. Pneumatic actuator; 10. Transmission rod; 11. Return spring; 12. Handle. Detailed Implementation

[0016] 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.

[0017] Please see Figures 1-3 This utility model provides a technical solution: The boiler quick manual / automatic drain valve includes a manual / automatic actuator, a valve cover 1, a valve body 2, a valve seat 3, a seal 4, and a valve core 5. The valve cover 1 is fixedly installed on the valve body 2. In this embodiment, the valve cover 1 is fixedly installed on the valve body 2 by fastening bolts 7, which facilitates the removal of the valve cover 1 from the valve body 2 or the installation of the valve cover 1 onto the valve body 2.

[0018] The valve core 5 slides through the valve cover 1. For example, in some embodiments, the valve core 5 and the valve cover 1 are connected by a sealing packing to achieve a sliding seal. There is no specific limitation on the packing, and those skilled in the art can choose according to the actual situation.

[0019] In this design, valve body 2 is provided with an inlet 201, an outlet 202, and a connecting channel 203. When the drain valve is open, the sewage in the boiler enters the valve body 2 through the inlet 201, then enters the outlet 202 through the connecting channel 203 and is discharged through the outlet 202, thereby realizing the sewage discharge function.

[0020] The valve seat 3 is fixedly installed at the top opening of the connecting channel 203, and the seal 4 is fixedly connected to the bottom of the valve core 5. The manual / automatic actuator is used to adjust the relative position of the valve seat 3 and the seal 4, so that the valve seat 3 and the seal 4 seal against each other to close the drain valve, or to separate the valve seat 3 and the seal 4 to open the drain valve.

[0021] In this technical solution, as shown in the figure, a protective cover 6 is fitted and fixed on the sealing element 4. The protective cover 6 is cylindrical, and the inner diameter of the protective cover 6 is larger than the diameter of the sealing element 4. The protective cover 6 can be made of stainless steel.

[0022] The top of the protective cover 6 is sealed and fixedly connected to the sealing element 4. For example, the top of the protective cover 6 is fixedly connected to the mounting block 604 by welding or other means, and the protective cover 6 is sealed and installed on the sealing element 4 by the mounting block 604.

[0023] The protective cover 6 has a through hole 601 on its peripheral wall. The diameter of the through hole 601 can be 1mm, which can effectively intercept large-diameter impurities.

[0024] When the valve seat 3 and the seal 4 are in a separated state, the bottom end of the protective cover 6 is separated from the valve seat 3. At this time, large-diameter impurities can be smoothly discharged through the drain valve. When the valve seat 3 and the seal 4 change from a separated state to a sealed contact state, the bottom end of the protective cover 6 abuts against the valve seat 3 before the seal 4 and the valve seat 3 seal against each other. At this time, large-diameter impurities are blocked outside the protective cover 6 and cannot enter between the seal 4 and the valve seat 3. This prevents large-diameter impurities from getting stuck between the seal 4 and the valve seat 3, ensuring that the drain valve has good sealing performance when closed. At the same time, it avoids the wear of the seal 4 and the valve seat 3 caused by large-diameter impurities getting stuck between the seal and the valve seat, and extends the service life of the entire drain valve.

[0025] Furthermore, a bending elastic part 602 is provided on the top of the perimeter wall of the protective cover 6. The bending elastic part 602 is located above the through hole 601. Specifically, the bending elastic part 602 can generate elastic contraction to a certain extent when the bottom end of the protective cover 6 contacts the valve seat 3, so as to prevent the bottom end of the protective cover 6 from rigidly impacting the valve seat 3.

[0026] In addition, a buffer plate 603 is fixed to the bottom of the perimeter wall of the protective cover 6, and the interior of the buffer plate 603 gradually decreases in size along the vertical downward direction. The buffer plate 603 also has a buffering function to prevent the bottom of the protective cover 6 from making a rigid impact with the valve seat 3.

[0027] In this technical solution, the manual / automatic actuator includes a bracket 8, a pneumatic actuator 9, a transmission rod 10, a return spring 11, and a handle 12. The pneumatic actuator 9 is mounted on the top of the bracket 8 by means of bolts or other structures.

[0028] The transmission rod 10 slides through the top of the bracket 8; the return spring 11 is sleeved on the outside of the transmission rod 10, and the two ends of the return spring 11 abut against the bracket 8 and the transmission rod 10 respectively.

[0029] The transmission rod 10 is connected between the seal 4 and the pneumatic actuator 9; specifically, the valve core 5 is fixedly connected between the seal 4 and the transmission rod 10.

[0030] The handle 12 is hinged to the bracket 8, with one end located outside the bracket 8 and the other end located on the transmission rod 10.

[0031] During normal boiler operation, the pneumatic actuator 9 is in an air-supply state. Compressed air enters the lower diaphragm chamber of the actuator 9 through the air inlet. The air pressure pushes the tray inside the actuator 9 upward, thereby driving the transmission rod 10 upward. The transmission rod 10 drives the valve core 5 upward, causing the drain valve to open quickly, thus achieving the drain function. When the air in the lower diaphragm chamber is discharged, the valve core 5 moves downward under the action of the return spring 11, and the seal 4 at the bottom of the valve core 5 contacts the valve seat 3 to close. In the absence of an air supply, pressing the handle 12 pushes the transmission rod 10 axially, causing the return spring 11 to contract and quickly open the drain valve, allowing the wastewater at the bottom of the boiler to be discharged through the drain valve. Releasing the handle 12 causes the return spring 11 to quickly return to its original position, causing the valve core 5 to move downward and closing the drain valve. The rapid opening and closing of the drain valve not only reduces boiler energy waste but also reduces erosion of the contact surface between the seal 4 and the valve seat 3, ensuring a long-term leak-proof seal.

[0032] Furthermore, in this technical solution, the valve seat 3 is pressed and fixed to the connecting channel 203 of the valve body 2 by the valve cover 1; and the seal 4 and the valve core 5 are connected by threads. Specifically, the top surface of the seal 4 is provided with a screw hole 401, and the bottom end of the valve core 5 is coaxially fixed with a stud 501. The screw hole 401 and the stud 501 are matched.

[0033] In actual use, by removing the fastening bolts 7, the valve cover 1 can be removed from the valve body 2, and the valve seat 3 and the seal 4 can be removed together, thus facilitating the replacement of the valve seat 3 and the seal 4.

[0034] 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 boiler quick manual / automatic blowdown valve, comprising a manual / automatic actuator, a valve seat (3), and a seal (4), wherein the manual / automatic actuator is used to adjust the relative position of the valve seat (3) and the seal (4) to seal against each other to close the blowdown valve, or to separate the valve seat (3) and the seal (4) to open the blowdown valve, characterized in that, A protective cover (6) is fitted and fixed on the sealing element (4). The protective cover (6) is cylindrical, and its top is sealed and fixedly connected to the sealing element (4). A through hole (601) is opened on its peripheral wall. When the valve seat (3) and the seal (4) are in a separated state, the bottom end of the protective cover (6) is separated from the valve seat (3), and large-diameter impurities can be discharged through the drain valve; when the valve seat (3) and the seal (4) are in a sealed contact state, the bottom end of the protective cover (6) contacts the valve seat (3) before the seal (4) and the valve seat (3) seal contact, and large-diameter impurities are blocked outside the protective cover (6).

2. The boiler quick manual / automatic drain valve according to claim 1, characterized in that, The top of the protective cover (6) is provided with a bending elastic part (602), which is located above the through hole (601).

3. The boiler quick manual / automatic blowdown valve according to claim 1, characterized in that, A buffer plate (603) is fixed at the bottom of the perimeter wall of the protective cover (6), and the interior of the buffer plate (603) gradually decreases along the vertical downward direction.

4. The boiler quick manual / automatic blowdown valve according to claim 1, characterized in that, The top of the protective cover (6) is fixedly connected to the mounting block (604), and the protective cover (6) is sealed on the sealing element (4) by the mounting block (604).

5. The boiler quick manual / automatic drain valve according to claim 1, characterized in that, The manual / automatic actuator includes a bracket (8), a pneumatic actuator (9), a transmission rod (10), a return spring (11), and a handle (12). The pneumatic actuator (9) is mounted on the top of the bracket (8), and the transmission rod (10) slides through the top of the bracket (8). The return spring (11) is sleeved on the outside of the transmission rod (10), and the two ends of the return spring (11) abut against the bracket (8) and the transmission rod (10) respectively; The transmission rod (10) is connected between the seal (4) and the pneumatic actuator (9); The handle (12) is hinged to the bracket (8), with one end located outside the bracket (8) and the other end located on the transmission rod (10).

6. The boiler quick manual / automatic drain valve according to claim 5, characterized in that, It also includes a valve cover (1), a valve body (2) and a valve core (5). The valve cover (1) is fixedly installed on the valve body (2). The valve core (5) slides through the valve cover (1) and is fixedly connected between the seal (4) and the transmission rod (10).

7. The boiler quick manual / automatic blowdown valve according to claim 6, characterized in that, The valve cover (1) is fixedly installed on the valve body (2) by fastening bolts (7); The valve seat (3) is pressed and fixed to the communication channel (203) of the valve body (2) by the valve cover (1); The seal (4) and the valve core (5) are connected by threads.

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