Operation power-off protection device for steam-water heat exchange station

Abstract

The utility model relates to the technical field of steam-water heat exchange stations, and provides a steam-water heat exchange station operation power-off protection device which comprises a pump body and a motor, the output end of the motor is provided with a protection mechanism, the protection mechanism comprises a driving shaft fixedly connected with the output shaft of the motor, and one end of the motor is fixedly connected with a power-off brake. A bearing seat is arranged on one side of the pump body, a connecting shaft is rotatably connected to the inner side of the bearing seat, one end of the connecting shaft is fixedly connected with an impeller shaft of the pump body, a transmission part is arranged at the other end of the connecting shaft, and a linkage mechanism is arranged in the middle of the connecting shaft. Through the power-off brake, ratchet wheel and pawl transmission and balancing weight linkage design, the dual protection mechanism of driving shaft braking and steam valve automatic closing at the moment of power failure is achieved; the balancing weight enables the cam to stop at the closing position under the action of gravity, a steam channel is thoroughly cut off by combining with locking of the limiting rod of the locking piece, and the problem of steam leakage caused by power failure is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam -water heat exchange station technical field, specifically, relate to a steam -water heat exchange station operation power failure protection device. BACKGROUND

[0002] Steam -water heat exchange station is the core pivot of central heating system, is responsible for the heat energy transmission of primary side high temperature steam (or high temperature water) to secondary side circulating water, satisfies the demand such as building heating, industrial heat through heat exchange, and its core function includes: through heat exchanger (tubular shell, plate type etc.) realizes high temperature steam and circulating water non - contact heat exchange, isolates primary side high pressure steam (1.6~4.0 MPa) with secondary side low pressure circulating water (0.4~1.6 MPa), guarantees system safety, according to heat load variation, dynamically adjusts steam flow and circulating water flow, realizes heat energy on demand distribution;

[0003] Through the retrieval, the "a remote control formula heat exchange station based on thing networking still includes water tank, first water pipe, second water pipe, steam -water direct mixing heat exchanger, heat pipe and steam -water separator" in Chinese patent (publication number: CN213178566U) is disclosed

[0004] However, in the implementation of the related technical process, the heat exchange station safety design of the patent has certain technical defects, wherein the pipeline system of the heat exchange station of the patent adopts a plurality of control valves, including butterfly valve, check valve and the like, and also includes steam valve in the steam pipeline, and the conventional valve mainly adopts electric or pneumatic valve, and the control system is prone to failure when power failure, which may cause steam leakage, water hammer and other problems, in addition, the electric or pneumatic valve is mainly realized through air cylinder or hydraulic cylinder, and the sealing element of the air cylinder or hydraulic cylinder is worn greatly, and the sealing element needs to be frequently replaced, so that the operation and maintenance cost is high, and in view of this, the utility model provides a steam -water heat exchange station operation power failure protection device. UTILITY MODEL CONTENTS

[0005] The utility model provides a steam -water heat exchange station operation power failure protection device, and solves the problem of steam leakage caused by failure of electric or pneumatic valve when power failure.

[0006] The technical solution of this utility model is as follows: A power failure protection device for a steam-water heat exchange station includes a pump body and a motor. The outlet end of the pump body is fixedly connected to a heat exchanger via a conduit. A steam valve is fixedly connected to the steam pipe of the heat exchanger. A protection mechanism is provided at the output end of the motor. The protection mechanism includes a drive shaft fixedly connected to the output shaft of the motor. One end of the motor is fixedly connected to a power failure brake for power failure braking of the drive shaft. A bearing seat is provided on one side of the pump body. A connecting shaft is rotatably connected to the inner side of the bearing seat. One end of the connecting shaft is fixedly connected to the impeller shaft of the pump body. The other end of the connecting shaft is provided with a transmission component that drives the connecting shaft to rotate by cooperating with the rotation of the drive shaft. A linkage mechanism is provided in the middle of the connecting shaft that drives the valve stem of the steam valve to move up and down to achieve opening and closing by cooperating with the rotation of the connecting shaft.

[0007] Preferably, the outlet of the pump body is connected to the inlet of the heat exchanger via a conduit, and the inlet of the pump body is connected to the water tank via a conduit.

[0008] Preferably, the transmission component includes a ratchet fixedly connected to the end of the drive shaft, and a turntable concentrically connected to one end of the connecting shaft. A plurality of pawls are rotatably connected to the outer edge of the turntable and are distributed at equal angles around the turntable. The plurality of pawls slide in engagement with the tooth grooves of the ratchet.

[0009] Preferably, the linkage mechanism includes a cam fixedly connected to the middle of the connecting shaft, a connecting rod rotatably connected to the outer edge of the cam, a connecting seat hinged to the end of the connecting rod away from the cam, the bottom end of the connecting seat being fixedly connected to the top of the valve stem of the steam valve, and a counterweight fixedly connected to one side of the cam.

[0010] Preferably, a locking element is provided on one side of the bearing housing. The locking element includes a mounting bracket fixedly connected to the bottom end of the bearing housing. A limiting rod that penetrates the side wall of the mounting bracket is slidably connected to one side of the mounting bracket. An iron block is fixedly connected to one end of the limiting rod. An electromagnet is fixedly connected to the inner side of the mounting bracket. An arc-shaped locking block is fixedly connected to the other end of the limiting rod. A slot is provided at one end of the counterweight block. The arc-shaped locking block slides into the slot.

[0011] Preferably, when the coil of the electromagnet is energized, the iron block is attracted to the electromagnet, and when the coil of the electromagnet is de-energized, the iron block is detached from the electromagnet.

[0012] Preferably, a tension spring is fitted on the limiting rod, one end of which is welded to the inner wall of the mounting bracket, and the other end of which is welded to the iron block.

[0013] Preferably, the motor, the power-off brake, and the electromagnet are connected in series in the same circuit.

[0014] The working principle and beneficial effects of this utility model are as follows:

[0015] 1. Through the linkage design of power failure brake, ratchet and pawl transmission and counterweight, a dual protection mechanism is realized to brake the drive shaft and automatically close the steam valve at the moment of power failure; the gravity of the counterweight makes the cam stop in the closed position, and combined with the limit rod of the locking part, it completely cuts off the steam passage and effectively prevents steam leakage and water hammer effect caused by power failure.

[0016] 2. Employing a ratchet-pawl one-way transmission and cam-linkage mechanical linkage structure, it eliminates the need for electrical control signals or hydraulic / pneumatic systems, avoiding the problem of easy wear of traditional valve seals and significantly reducing failure rate and maintenance costs. The mechanical structure offers rapid response and superior action determinism compared to traditional electrically controlled valves.

[0017] 3. The motor, power failure brake, and electromagnet are connected in series in the same circuit. When power is lost, all three are triggered synchronously (motor stops, brake locks shaft, and electromagnet releases limit rod), realizing coordinated action of multiple components and improving the overall reliability and response consistency of the system.

[0018] 4. The locking mechanism is designed with an electromagnet and a tension spring working together. When the power is off, the tension spring drives the limit rod to insert into the counterweight slot, forming a physical locking barrier. Even if there is an external impact or accidental human touch, the valve cannot be changed to the closed state, ensuring system safety redundancy.

[0019] 5. By replacing complex electrical control circuits with mechanical transmission, the reliance on components such as sensors and controllers is reduced, manufacturing costs and post-maintenance difficulty are lowered, making it particularly suitable for harsh working environments such as high pressure and high temperature, thus extending the service life of the equipment. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of a power failure protection device for a steam-water heat exchange station according to the present invention;

[0022] Figure 2 This is a schematic diagram of the protective mechanism of this utility model;

[0023] Figure 3 This is a schematic diagram of the transmission component of this utility model;

[0024] Figure 4 This is a schematic diagram of the linkage mechanism of this utility model;

[0025] Figure 5 This is a structural schematic diagram of the locking component of this utility model;

[0026] Figure 6 This is the circuit diagram of this utility model.

[0027] In the diagram: 1. Pump body; 2. Protection mechanism; 22. Drive shaft; 23. Power failure brake; 24. Bearing housing; 25. Connecting shaft; 26. Transmission component; 261. Ratchet; 262. Turntable; 263. Pawl; 3. Linkage mechanism; 31. Cam; 32. Connecting rod; 33. Connecting seat; 34. Counterweight; 35. Locking component; 352. Mounting bracket; 353. Limiting rod; 354. Iron block; 355. Electromagnet; 356. Arc-shaped locking block; 357. Tension spring; 358. Slot; 4. Steam valve; 5. Heat exchanger; 6. Motor. Detailed Implementation

[0028] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model. Example 1

[0029] like Figures 1-4 As shown, this embodiment proposes a power failure protection device for a steam-water heat exchange station, including a pump body 1 and a motor 6. A heat exchanger 5 is fixedly connected to the outlet end of the pump body 1 via a conduit. A steam valve 4 is fixedly connected to the steam pipe of the heat exchanger 5. The outlet of the pump body 1 is connected to the inlet of the heat exchanger 5 via a conduit, and the inlet of the pump body 1 is connected to a water tank via a conduit. A protection mechanism 2 is provided at the output end of the motor 6. The protection mechanism 2 includes a drive shaft 22 fixedly connected to the output shaft of the motor 6. A power failure brake 23 for power-off braking of the drive shaft 22 is fixedly connected to one end of the motor 6. A bearing seat 24 is provided on one side of the pump body 1, and a bearing is rotatably connected to the inner side of the bearing seat 24. A connecting shaft 25 is provided. One end of the connecting shaft 25 is fixedly connected to the impeller shaft of the pump body 1. The other end of the connecting shaft 25 is provided with a transmission component 26 that drives the connecting shaft 25 to rotate by cooperating with the rotation of the drive shaft 22. A linkage mechanism 3 is provided in the middle of the connecting shaft 25 that drives the valve stem of the steam valve 4 to move up and down to achieve opening and closing by cooperating with the rotation of the connecting shaft 25. The linkage mechanism 3 includes a cam 31 fixedly connected to the middle of the connecting shaft 25. A connecting rod 32 is rotatably connected to the outer edge of the cam 31. A connecting seat 33 is hinged to the end of the connecting rod 32 away from the cam 31. The bottom end of the connecting seat 33 is fixedly connected to the top of the valve stem of the steam valve 4. A counterweight 34 is fixedly connected to one side of the cam 31.

[0030] By starting the motor 6, the drive shaft 22 is driven to rotate, which in turn drives the connecting shaft 25 to rotate. This causes the cam 31 to rotate synchronously, and the connecting rod 32 drives the valve stem of the steam valve 4 to move up and down, allowing the steam valve 4 to open and close intermittently. This allows for single-time control of the steam flow rate output by the steam valve 4. When the power to the steam-water heat exchange station system is interrupted, the motor 6 stops and the circuit of the power-off brake 23 is de-energized. This causes the power-off brake 23 to brake the drive shaft 22, causing the cam 31 to stop rotating due to inertia after losing power. Due to the gravity of the counterweight 34, the end of the cam 31 containing the counterweight 34 is at the lowest point after the cam 31 comes to rest. This keeps the output end of the valve stem of the steam valve 4 at the lowest position, thus keeping the valve core of the steam valve 4 closed. This prevents steam leakage from the steam pipeline where the steam valve 4 is located when the system is powered off.

[0031] The transmission component 26 includes a ratchet 261 fixedly connected to the end of the drive shaft 22. One end of the connecting shaft 25 is fixedly connected to a turntable 262 concentrically arranged with the ratchet 261. The outer edge of the turntable 262 is rotatably connected to a plurality of pawls 263 distributed at equal angles around the turntable 262. The plurality of pawls 263 slide in engagement with the tooth grooves of the ratchet 261.

[0032] By starting the motor 6, the drive shaft 22 is driven to rotate, which causes the ratchet 261 to drive the pawl 263 to rotate, which causes the turntable 262 to rotate synchronously, which causes the connecting shaft 25 to rotate, which causes the cam 31 to rotate synchronously, which causes the connecting rod 32 to drive the valve stem of the steam valve 4 to move up and down, so that the steam valve 4 can be opened and closed intermittently, thereby controlling the steam flow rate output by the steam valve 4 in a single operation.

[0033] When the power is lost in the steam-water heat exchange station system, the motor 6 stops and the circuit of the power-off brake 23 is de-energized, causing the power-off brake 23 to brake the drive shaft 22. After losing power, the cam 31 stops rotating due to inertia. Due to the gravity of the counterweight 34, after the cam 31 comes to rest, the end of the cam 31 where the counterweight 34 is located is at the lowest point, so that the output end of the valve stem of the steam valve 4 is at the lowest position, which means that the valve core of the steam valve 4 is in the closed state. The ratchet and pawl design can ensure that the cam 31 will not brake prematurely, which can also ensure that the counterweight 34 can fall at the lowest point, so that the steam valve 4 can be closed smoothly to prevent steam leakage. Example 2

[0034] like Figure 5As shown, this embodiment is a further optimization of Embodiment 1. The only difference between this embodiment and Embodiment 1 is that a locking element 35 is provided on one side of the bearing housing 24. The locking element 35 includes a mounting bracket 352 fixedly connected to the bottom end of the bearing housing 24. A limiting rod 353 that penetrates the side wall of the mounting bracket 352 is slidably connected to one side of the mounting bracket 352. An iron block 354 is fixedly connected to one end of the limiting rod 353. An electromagnet 355 is fixedly connected to the inner side of the mounting bracket 352. An arc-shaped surface is fixedly connected to the other end of the limiting rod 353. The locking block 356 and the counterweight block 34 have a slot 358 at one end. The arc-shaped locking block 356 slides in the slot 358. When the coil of the electromagnet 355 is energized, the iron block 354 is attracted to the electromagnet 355 and the tension spring 357 is in a compressed state. When the coil of the electromagnet 355 is de-energized, the iron block 354 is disengaged from the electromagnet 355. The limiting rod 353 is fitted with a tension spring 357. One end of the tension spring 357 is welded to the inner wall of the mounting bracket 352, and the other end of the tension spring 357 is welded to the iron block 354.

[0035] When the system of the steam-water heat exchange station is de-energized, the coil of electromagnet 355 is also de-energized, the iron block 354 loses the attraction force of electromagnet 355, and the tension spring 357 releases potential energy to make the iron block 354 separate from electromagnet 355. This causes the limit rod 353 to move closer to the counterweight 34 until the cam 31 comes to a stop. Then, the limit rod 353 slides into the slot 358 under the action of the tension spring 357. This can prevent the steam valve 4 from being opened due to accidental operation of the cam 31.

[0036] In this circuit, the motor 6, the power-off brake 23, and the electromagnet 355 are connected in series in the same circuit, such as... Figure 6 As shown, after the power switch S is turned on, the motor 6 (M) starts, causing the ratchet 261 to drive the pawl 263 to rotate, causing the turntable 262 to rotate synchronously, causing the connecting shaft 25 to rotate, causing the cam 31 to rotate synchronously, causing the connecting rod 32 to drive the valve stem of the steam valve 4 to move up and down, causing the steam valve 4 to open and close intermittently, thereby allowing the steam flow rate output by the steam valve 4 to be controlled once.

[0037] When the system of the steam-water heat exchange station is powered off, the motor 6 (M) stops and the circuit of the power failure brake 23 (L) is de-energized. The relay (KA) protects the circuit. At the same time, the power failure brake 23 (L) brakes the drive shaft 22, so that the cam 31 stops rotating under inertia after losing power. Due to the gravity of the counterweight 34, after the cam 31 stops, the end of the cam 31 where the counterweight 34 is located is at the lowest point, so that the output end of the valve stem of the steam valve 4 is at the lowest position, which means that the valve core of the steam valve 4 is in the closed state.

[0038] After the system is powered off, the coil of electromagnet 355 (YA) is also de-energized, and the iron block 354 loses the attraction force of electromagnet 355. The tension spring 357 releases potential energy, causing the iron block 354 to detach from electromagnet 355, which in turn causes the limit rod 353 to move closer to the counterweight 34. After the cam 31 comes to a stop, the limit rod 353 slides into the slot 358 under the action of the tension spring 357. This can prevent the cam 31 from being accidentally operated, causing the steam valve 4 to be opened.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A power failure protection device for a steam-water heat exchange station, characterized in that, include Pump body (1); Motor (6); Heat exchanger (5); the inlet of the heat exchanger (5) is connected to the outlet of the pump body (1) through a conduit; Steam valve (4); the steam valve (4) is fixedly connected to the steam pipe of the heat exchanger (5); Protection mechanism (2); The protection mechanism (2) includes a drive shaft (22) fixedly connected to the output shaft of the motor (6), a power failure brake (23) for power failure braking of the drive shaft (22) is fixedly connected to one end of the motor (6), a bearing seat (24) is provided on one side of the pump body (1), a connecting shaft (25) is rotatably connected to the inner side of the bearing seat (24), one end of the connecting shaft (25) is fixedly connected to the impeller shaft of the pump body (1), and the other end of the connecting shaft (25) is provided with a transmission component (26) that drives the connecting shaft (25) to rotate by cooperating with the rotation of the drive shaft (22); Linkage mechanism (3); The linkage mechanism (3) is located in the middle of the connecting shaft (25) and drives the valve stem of the steam valve (4) to move up and down to achieve opening and closing by cooperating with the rotation of the connecting shaft (25).

2. The power failure protection device for a steam-water heat exchange station according to claim 1, characterized in that, The outlet of the pump body (1) is connected to the inlet of the heat exchanger (5) through a conduit, and the inlet of the pump body (1) is connected to the water tank through a conduit.

3. The power failure protection device for a steam-water heat exchange station according to claim 1, characterized in that, The transmission component (26) includes a ratchet (261) fixedly connected to the end of the drive shaft (22). One end of the connecting shaft (25) is fixedly connected to a turntable (262) concentrically arranged with the ratchet (261). The outer edge of the turntable (262) is rotatably connected to a plurality of pawls (263) distributed at equal angles around the turntable (262). The plurality of pawls (263) slide in engagement with the tooth grooves of the ratchet (261).

4. The power failure protection device for a steam-water heat exchange station according to claim 1, characterized in that, The linkage mechanism (3) includes a cam (31) fixedly connected to the middle of the connecting shaft (25). A connecting rod (32) is rotatably connected to the outer edge of the cam (31). A connecting seat (33) is hinged to the end of the connecting rod (32) away from the cam (31). The bottom end of the connecting seat (33) is fixedly connected to the top of the valve stem of the steam valve (4). A counterweight (34) is fixedly connected to one side of the cam (31).

5. The power failure protection device for a steam-water heat exchange station according to claim 4, characterized in that, A locking element (35) is provided on one side of the bearing housing (24). The locking element (35) includes a mounting bracket (352) fixedly connected to the bottom end of the bearing housing (24). A limiting rod (353) that penetrates the side wall of the mounting bracket (352) is slidably connected to one side of the mounting bracket (352). An iron block (354) is fixedly connected to one end of the limiting rod (353). An electromagnet (355) is fixedly connected to the inner side of the mounting bracket (352). An arc-shaped locking block (356) is fixedly connected to the other end of the limiting rod (353). A slot (358) is opened at one end of the counterweight block (34). The arc-shaped locking block (356) slides with the slot (358).

6. The power failure protection device for a steam-water heat exchange station according to claim 5, characterized in that, When the coil of the electromagnet (355) is energized, the iron block (354) is attracted to the electromagnet (355), and when the coil of the electromagnet (355) is de-energized, the iron block (354) is detached from the electromagnet (355).

7. A power failure protection device for a steam-water heat exchange station according to claim 5, characterized in that, A tension spring (357) is fitted on the limiting rod (353). One end of the tension spring (357) is welded to the inner wall of the mounting bracket (352), and the other end of the tension spring (357) is welded to the iron block (354).

8. A power failure protection device for a steam-water heat exchange station according to claim 5, characterized in that, The motor (6), the power failure brake (23), and the electromagnet (355) are connected in series in the same circuit.

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