Low resistance silent check device for hvac system circulating pump outlet

Abstract

The application discloses a low-resistance and mute check device for the outlet of a circulating pump of a heating and ventilation system, which comprises a valve body, a first connecting part and a second connecting part connected to the two ends of the valve body; the valve body comprises an outer pipe body and a buffer pipe; the outer pipe body is provided with a water seal at one end; the water seal is provided with a through hole in the center; the buffer pipe is movably arranged in the through hole; the end of the buffer pipe is provided with an outer convex clasp ring and a valve flap; the valve flap is rotatably connected to the base and covers the end of the buffer pipe; a limiting stopper is arranged on the inner pipe wall of the outer pipe body; the limiting stopper corresponds to the convex block to limit the position of the buffer pipe in the outer pipe body; the limiting stopper is fixed on the pipe wall of the outer pipe body through a screw; a buffer spring is sleeved on the outer side of the buffer pipe; the buffer spring is a cylindrical ring spring; one end of the buffer spring is connected to the water seal of the end of the outer pipe body; and the other end of the buffer spring is connected to the outer convex clasp ring. The application effectively reduces the circulating resistance of the system, has a stable structure and strong practical performance.

Description

Technical Field

[0001] This invention belongs to the field of HVAC system technology, specifically relating to a low-resistance, silent check valve for use at the outlet of a water pump in an HVAC system. Background Technology

[0002] With increasing demands for building comfort, the scale of HVAC engineering projects is expanding rapidly alongside national development, making the tasks of ensuring safe and energy-efficient HVAC operation increasingly important. Check devices are crucial components in HVAC systems for protecting circulating pumps; all circulating pump outlets require check devices to prevent backflow and avoid liquid hammer on the pump impeller. Traditional check devices require rapid closure in practical use because the medium in the pipeline flows in reverse. With rapid closure, the medium velocity drops quickly from maximum to zero, causing a rapid pressure increase, which can generate "water hammer," potentially damaging pipes and valves.

[0003] Water hammer impact from check valves is a common problem in HVAC system operation. Many pipelines experience severe vibrations, causing weld cracks and fitting damage, while also generating significant noise at the operating site. Therefore, most projects now require the use of silent or slow-closing check valves to effectively prevent the violent water hammer vibration caused by rapid closure. However, because the spring in silent or slow-closing check valves is generally located in the center of the valve body, it causes turbulent fluid flow within the valve, resulting in significant local flow resistance losses and substantial energy waste. Over long-term operation, water friction can also cause valve plate displacement or deformation, leading to sealing failure and loss of valve function.

[0004] Therefore, there is a need in the art for a new check valve to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a low-resistance, silent check valve for the outlet of a water pump in a heating and ventilation system, which can effectively reduce the circulation resistance of the system, has a stable structure, and strong practical performance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A low-resistance, silent check valve for use at the outlet of a circulating pump in a heating and ventilation system, the device comprising a valve body and a first connecting portion and a second connecting portion connected to both ends of the valve body;

[0008] The valve body includes an outer tube and a buffer tube. One end of the outer tube is provided with a water seal. The water seal has a perforation in the center. The buffer tube is movably inserted through the perforation.

[0009] The end of the buffer tube is provided with an outwardly protruding retaining ring and a valve flap. The two sides of the outwardly protruding retaining ring are respectively provided with a base and a protrusion. The valve flap is rotatably connected to the base and can cover the end of the buffer tube.

[0010] A limiting block is provided on the inner wall of the outer tube body. The limiting block corresponds to the protrusion to restrict the position of the buffer tube in the outer tube body. The limiting block is fixed to the tube wall of the outer tube body by screws.

[0011] A buffer spring is sleeved on the outside of the buffer tube. The buffer spring is a cylindrical ring spring. One end of the buffer spring is connected to the water seal at the end of the outer tube body, and the other end is connected to the external convex retaining ring.

[0012] Preferably, the valve disc includes a valve plate, a pin, a valve disc sealing gasket, and a fixing screw. The valve plate is rotatably connected to the base via the pin, and the valve disc sealing gasket is fixed to the side of the valve plate near the protruding retaining ring via the fixing screw.

[0013] Preferably, the valve disc sealing gasket is larger than the valve plate; and / or the valve disc sealing gasket is made of butyl rubber or aluminum; and / or the pin is made of carbon steel.

[0014] Preferably, the water seal component includes a first water seal plate and a second water seal plate, which are spaced apart and their edges are welded to the inner surface of the outer tube. The first water seal plate and the second water seal plate are provided with a perforation at their center, and a water seal ring is fixed on each perforation. The buffer tube passes through the water seal ring.

[0015] Preferably, flanges are provided at both ends of the first connecting part and / or the second connecting part, and the ends of the first connecting part and / or the second connecting part are connected to the ends of the outer tube body through the flanges.

[0016] Preferably, the ends of the first connecting portion and / or the second connecting portion are welded to the ends of the outer tube body.

[0017] Preferably, the outer tube is made of a casting or a casting carbon steel mold.

[0018] The advantages of this invention are:

[0019] The low-resistance silent check valve for water pump outlet in HVAC systems provided by this invention is suitable for heating, cooling and other HVAC circulation systems. It can effectively buffer the impact of water flow on valves, and has the advantages of low resistance and silent operation. It has a stable structure and ensures safe operation. Attached Figure Description

[0020] Figure 1This is a schematic diagram of a low-resistance silent check device for the outlet of a water pump in a heating and ventilation system, according to an embodiment of the present invention.

[0021] Figure 2 This is a cross-sectional schematic diagram of a low-resistance silent check device for the outlet of a water pump in a heating and ventilation system according to an embodiment of the present invention.

[0022] Figure 3 and Figure 4 This is a partial cross-sectional view of a low-resistance silent check valve for use at the outlet of a water pump in a heating and ventilation system, according to an embodiment of the present invention. Detailed Implementation

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] See appendix Figures 1 to 4 This example illustrates the main structure of a low-resistance silent check device for the outlet of a circulating pump in a heating and ventilation system. The low-resistance silent check device for the outlet of a circulating pump in a heating and ventilation system provided in this embodiment includes a valve body 10 and a first connecting portion 20 and a second connecting portion 30 connected to both ends of the valve body 10.

[0025] The valve body 10 includes an outer pipe 11 and a buffer pipe 12. The outer pipe 11 can be manufactured from an alloy steel casting or a carbon steel casting mold, with the material selected according to the pipeline pressure rating. The two ends of the outer pipe 11 are respectively connected to a first connecting part 20 and a second connecting part 30. Both ends of the first connecting part 20 and the second connecting part 30 are equipped with flanges. Both the first connecting part 20 and the second connecting part 30 use national standard steel flanges, and the flange sealing surface can be determined according to the pressure rating. The ends of the first connecting part 20 and the second connecting part 30 are connected to the ends of the outer pipe 11 via flanges, such as... Figure 1 As shown. Of course, the ends of the first connecting part 20 and the second connecting part 30 can also be welded to the ends of the outer tube body 11, such as... Figure 2 As shown. The first connecting part 20 and the second connecting part 30 only need to be able to be stably connected to the outer tube body 11 and ensure the normal operation of the device, and there are no restrictions on their specific connection forms.

[0026] A water seal 40 is provided at one end of the outer pipe 11. The water seal 40 has a perforation 41 at its center, and the buffer pipe 12 is movably inserted through the perforation 41. Optionally, the water seal 40 includes a first water seal plate 42 and a second water seal plate 43. The first water seal plate 42 and the second water seal plate 43 are spaced apart, and their edges are welded to the inner surface of the outer pipe 11. The first water seal plate 42 and the second water seal plate 43 have a perforation 41 at their center, and a water seal ring 44 is fixed on each perforation 41 to seal the water flow.

[0027] The buffer tube 12 is located inside the outer tube body 11 and is movable back and forth along the length of the outer tube body 11. The buffer tube 12 passes through the water seal ring 44. That is, part of the buffer tube 12 is located inside the outer tube body 11, and part of it is located inside the first connecting part 20. The end of the buffer tube 12 located inside the outer tube body 11 is provided with an outwardly protruding retaining ring 13 and a valve disc 14. The corresponding sides of the outwardly protruding retaining ring 13 are respectively provided with a base 15 and a protrusion 16. The valve disc 14 is rotatably connected to the base 15 and can cover the end of the buffer tube 12. When the valve disc 14 is closed, the valve disc sealing gasket 143 and the outwardly protruding retaining ring are tightly connected.

[0028] A limiting block 17 is provided on the inner wall of the outer tube 11. The limiting block 17 corresponds to the protrusion 16 to limit the position of the buffer tube 12 in the outer tube 11. The limiting block 17 is fixed to the outer tube 11 by screws 18. Its function is to limit the upward movement of the buffer tube 12. A buffer spring 19 is sleeved on the outside of the buffer tube 12. One end of the buffer spring 19 is connected to the water seal 40 at the end of the outer tube 11, and the other end is connected to the external convex retaining ring 13. The buffer spring 19 is a helical compression spring that withstands axial pressure, and the form of the buffer spring 19 is a cylindrical ring spring.

[0029] The valve disc 14 includes a valve plate 141, a pin 142, a valve disc sealing gasket 143, and a fixing screw 144. The valve plate 141 is rotatably connected to the base 15 via the pin 142. The valve disc sealing gasket 143 is fixed to the side of the valve plate 141 near the outwardly protruding retaining ring 13 via the fixing screw 144. The valve plate 141 is a disc-shaped component cut from steel plate, with a thickness of 8-10 mm. The valve disc sealing gasket 143 is a disc-shaped component made of 5 mm thick butyl rubber sheet, with a diameter larger than that of the valve plate 141. Considering corrosion resistance and soft material requirements, the valve disc sealing gasket 143 can also be made of rolled pure aluminum, in the shape of a ring, with fixing holes on the ring. The valve disc sealing gasket 143 is fixed to the valve plate 141 with screws. The valve plate 141 and the pin 142 are connected by welding. The pin 142 is made of carbon steel.

[0030] The low-resistance silent check valve device for the outlet of a circulating pump in a heating and ventilation system provided by the present invention operates as follows: When the high-pressure water flow from the pump outlet enters the buffer pipe 12 from the inlet end of the first connection part 20, the water flow opens the valve disc 14, and the valve disc 14 rotates around the pin 142 to open. The water flow flows out of the second connection part 30 with almost no resistance and enters the subsequent pipeline. In this state, the buffer spring 19 is in the maximum extension state, providing an upward thrust to the buffer pipe 12 until the limit stop 17 stops the buffer pipe 12, reaching a balanced state.

[0031] When the pump stops, the rapid pressure drop causes a sudden increase in the pressure difference across valve disc 14, resulting in reverse water flow. Valve disc 14 rotates around pin 142 and quickly closes, causing the valve disc sealing gasket 143 and the external retaining ring to engage, achieving the effect of stopping the water flow. Simultaneously, the downward impact force causes valve disc 14 to move the buffer tube 12 downward, compressing the buffer spring 19 until the upward force of the spring and the downward force of the water flow are balanced. The instantaneous impact force is absorbed by the buffer spring 19, and through the deformation of the buffer spring 19, the pressure of the water flow hammering is relieved, achieving a buffering and flow-blocking effect, reducing pipeline vibration, and avoiding water hammer accidents that occur with traditional check devices when closing. Therefore, compared with traditional silent or slow-closing check devices, this invention reduces system circulation resistance, saves operating costs, and has stronger practical performance.

[0032] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A low-resistance, silent check valve for use at the outlet of a circulating pump in a heating, ventilation, and air conditioning (HVAC) system, characterized in that, The device includes a valve body and a first connecting part and a second connecting part connected to both ends of the valve body; The valve body includes an outer tube and a buffer tube. One end of the outer tube is provided with a water seal. The water seal has a perforation in the center. The buffer tube is movably inserted through the perforation. The end of the buffer tube is provided with an outwardly protruding retaining ring and a valve flap. The two sides of the outwardly protruding retaining ring are respectively provided with a base and a protrusion. The valve flap is rotatably connected to the base and can cover the end of the buffer tube. A limiting block is provided on the inner wall of the outer tube body. The limiting block corresponds to the protrusion to restrict the position of the buffer tube in the outer tube body. The limiting block is fixed to the tube wall of the outer tube body by screws. A buffer spring is sleeved on the outside of the buffer tube. The buffer spring is a cylindrical ring spring. One end of the buffer spring is connected to the water seal at the end of the outer tube body, and the other end is connected to the external convex retaining ring.

2. The low-resistance silent check valve for the outlet of a circulating pump in a HVAC system as described in claim 1, characterized in that, The valve disc includes a valve plate, a pin, a valve disc sealing gasket, and a fixing screw. The valve plate is rotatably connected to the base via the pin, and the valve disc sealing gasket is fixed to the side of the valve plate near the protruding retaining ring via the fixing screw.

3. The low-resistance silent check valve for the outlet of a circulating pump in a HVAC system as described in claim 2, characterized in that, The valve disc sealing gasket is larger than the valve plate; and / or the valve disc sealing gasket is made of butyl rubber or aluminum; and / or the pin is made of carbon steel.

4. The low-resistance silent check valve for the outlet of a circulating pump in a HVAC system as described in claim 1, characterized in that, The water seal component includes a first water seal plate and a second water seal plate, which are spaced apart and their edges are welded to the inner surface of the outer tube. The first water seal plate and the second water seal plate have a perforation at their center, and a water seal ring is fixed on each perforation. The buffer tube passes through the water seal ring.

5. The low-resistance silent check valve for the outlet of a circulating pump in a HVAC system as described in claim 1, characterized in that, Flanges are provided at both ends of the first connecting part and / or the second connecting part, and the ends of the first connecting part and / or the second connecting part are connected to the ends of the outer tube body through the flanges.

6. The low-resistance silent check valve for the outlet of a circulating pump in a HVAC system as described in claim 1, characterized in that, The ends of the first connecting part and / or the second connecting part are welded to the ends of the outer tube body.

7. The low-resistance silent check valve for the outlet of a circulating pump in a HVAC system as described in claim 5, characterized in that, The outer tube is made of cast material or cast carbon steel mold.

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