CN108131473A - The check valve of decompression function built in a kind of band - Google Patents

Abstract

The invention discloses a kind of check valves of decompression function built in band, it includes valve body, it is axially disposed in valve body to have fluid channel, annular sealing surface and spring base are fixed at intervals in fluid channel, the first core assembly is provided between fluid channel annular sealing surface and spring base, first core assembly includes the first spool and the first spring, first spool is in sealing contact with annular sealing surface under the action of the first spring, first spool upper edge is axially through being provided with relief hole, the second core assembly for blocking relief hole is additionally provided in valve body, second core assembly includes the second spool and second spring, second spool blocks relief hole under second spring effect, the opening direction of second spool is opposite with the opening direction of the first spool.Check valve in the present invention is adapted to mount to water-heater water tank water inlet, and in water-heater water tank normal water supply, pipeline can be connected in check valve, and when water-heater water tank hypertonia, check valve being capable of reflux pressure letdown.

Description

A check valve with built-in pressure relief

technical field

The invention relates to a one-way valve with a built-in pressure relief function, belonging to the field of one-way valve structure design.

Background technique

Patent document CN101956846B discloses a shut-off valve, including: valve body, retainer, valve core, spring, spring seat and locking plate, the valve body is a hollow cylinder, both ends of the valve body are processed with internal threads, and the retainer It is a bowl-shaped ring, the baffle is connected to the left end of the valve body through threads, the valve core is pressed against the hole of the baffle by a spring, one end of the spring is on the spool, and the other end of the spring is on the spring seat. The spring seat is a disc with external thread, and there are holes evenly distributed on the disc. The spring seat is connected to the right end inside the valve body through threads, and the locking plate is a ring with external threads. On the other side, the position of the baffle, spring seat and locking piece inside the valve body can be adjusted by threads. When the above is in use, the stop valve is connected to the pipeline. When the water pressure in the pipeline reaches the opening pressure, the water pressure overcomes the elastic force of the compression spring to push the valve core away from the conduction pipeline. When the water pressure is low, the valve core Under the action of the compression spring, it resists the locking piece to cut off the pipeline to prevent the water from flowing back. The technical defect of the shut-off valve in the above-mentioned patent documents is that when the system pressure is too high, the excess pressure cannot be released, which may cause a partial burst of the system, posing a safety hazard.

In addition, patent document CN105257874A discloses a cut-off valve with overflow function, which includes a valve body, a valve cavity is arranged inside the valve body, and an overflow device is arranged at the outlet end of the valve body. There is a pressure relief channel connecting the valve cavity with the overflow device. The overflow device includes a safety valve housing, a guide rod and a pressure ring. The safety valve housing is fixedly connected with the outlet end of the valve body. The guide rod It is fixed inside the safety valve housing, the pressure ring is sleeved on the guide rod and fits with the guide rod in clearance, and a spring is arranged between the pressure ring and the safety valve housing, and the spring is sleeved on the guide rod. The bottom of the safety valve housing is provided with an overflow port. The stop valve disclosed in this patent document has the function of overflow and pressure relief, that is, when the system pressure is too high, the excess pressure can be released through the pressure overflow device, so as to avoid local bursting of the system and improve the safety of the system. The valve disclosed in the patent document is essentially a pressure relief valve, which can only be used for one-way pressure relief, and is not suitable for two-way pressure-bearing environments, and its scope of application is limited.

To sum up, there is still room for improvement in the existing one-way valve structure.

Contents of the invention

In view of this, the present invention aims to provide a check valve with built-in pressure relief function with reasonable structure. The check valve is suitable for installation and use in a two-way pressurized environment. When the water heater tank is normally supplied with water, the one-way valve can conduct the pipeline, and when the pressure of the water heater tank is too high, the one-way valve can flow back to release the pressure.

The technical scheme that realizes the object of the present invention is:

A one-way valve with a built-in pressure relief function, comprising a valve body, a fluid channel for fluid passage is arranged in the valve body along the axial direction, an annular sealing surface and a spring seat are fixed at intervals in the fluid channel, and the fluid channel A first spool assembly is arranged between the annular sealing surface and the spring seat in the channel, and the first spool assembly includes a first spool and a first spring, and the two ends of the first spring are respectively connected to the first valve The core is against the spring seat, and the first valve core is in sealing contact with the annular sealing surface under the action of the first spring. A pressure relief hole is provided through the first valve core in the axial direction. The second spool assembly for blocking the pressure relief hole, the second spool assembly includes a second spool and a second spring, the second spool blocks the pressure relief hole under the action of the second spring, The opening direction of the second valve core is opposite to that of the first valve core.

In the above technical solution, the first valve core is formed by connecting the first valve disc and the first valve rod, the first valve rod is fixed at the center of the first valve disc and extends toward the direction of the spring seat, and the first spring simultaneously The shaft is arranged on the outside of the first valve stem, and its two ends respectively abut against the first valve disc and the spring seat. Under the action of the first spring, the first valve disc is in sealing contact with the annular sealing surface, so The pressure relief hole is coaxially disposed on the first valve stem.

In the above technical solution, the second valve core assembly is installed on the first valve core: the second valve core is composed of a second valve disc, a second valve stem and a casing part connected in sequence, and the second valve core The flap is set on the side of the first valve flap facing away from the spring seat, and its outer diameter is larger than the diameter of the pressure relief hole. The second valve stem is fixed at the center of the second valve flap and passes through the pressure relief hole to meet with the The first end of the casing part is fixedly connected, and the gap between the second valve rod and the inner wall of the pressure relief hole forms an overflow channel, and the casing part is provided with a liquid outlet communicating with the overflow channel. hole, the sleeve part is movably fitted between the first spring and the first valve stem, the center of the spring seat is provided with a mounting hole suitable for installing the sleeve part, and the second The spring is installed between the first spring and the first valve stem, and its two ends are respectively against the first valve disc and the second end of the sleeve part, and under the action of the second spring, the second The valve flap is in sealing contact with the first valve flap to block the pressure relief hole, and the sleeve part is connected to the first valve rod through a movable limiting structure.

In the above technical solution, the limiting structure includes a limiting groove formed on the inner wall of the sleeve part and a limiting boss formed on the end of the first valve stem extending radially outward, the limiting The boss is adapted to be limited to move within the limit slot.

In the above technical solution, the spring seat is screwed into the valve body.

The present invention has positive effect:

(1) The check valve in the present invention is connected to the water inlet pipe of the water heater tank, and when water is supplied to the water heater tank, the water pressure in the pipeline overcomes the elastic force of the first spring and pushes the first valve core to move to make it contact with the annular sealing surface Separated, as shown in Figure 2, the water flow enters the water heater tank through the one-way valve, and when the water supply to the water heater tank is stopped, the water pressure in the pipeline decreases, and the first valve core is sealed with the ring under the action of the first spring. Surface sealing contact, so as to cut off the pipeline to prevent the water in the water heater tank from backflowing. When the temperature of the hot water in the water heater tank is too high and the pressure inside the water heater tank increases sharply to a safe point, as shown in Figure 3, the inside of the water heater tank is to the first The second spool generates a greater force, so that the second spool overcomes the elastic force of the second spring and moves to open the pressure relief hole, and then the water inside the water heater tank flows back into the pipeline through the one-way valve, thereby reducing the internal pressure of the water heater tank , making the system (water heater tank) operate in a safe state. The structure of the invention is simplified and reasonable, can prevent backflow when the system is in normal operation, and can backflow and release pressure when the system is overpressured, and has good practicability. In addition to being applied to the water inlet pipe of the water tank of the water heater, the one-way valve in this embodiment can also be used in other bidirectional pressure-bearing environments.

Description of drawings

Fig. 1 is the structural representation of check valve among the present invention;

Fig. 2 is the structure view when one-way valve enters water among the present invention;

Fig. 3 is a structural view of the one-way valve in the present invention when the pressure is released.

The reference signs shown in the figure are: 1-valve body; 2-fluid channel; 3-ring sealing surface; 4-spring seat; 5-first valve core; 51-pressure relief hole; 52-first valve disc; 53-first valve stem; 531-limiting boss; 6-first spring; 7-second valve core; 71-second disc; 72-second valve stem; 721-gap; 73-casing part ; 731-liquid hole; 732-first end; 733-second end; 734-limiting groove; 8-second spring.

Detailed ways

The specific structure of the check valve in the present invention is described below in conjunction with the accompanying drawings:

A check valve with a built-in pressure relief function, as shown in Figure 1, it includes a valve body 1, a fluid channel 2 for fluid passage is arranged in the valve body 1 along the axial direction, and the fluid channel 2 is spaced An annular sealing surface 3 and a spring seat 4 are fixed, and a first valve core assembly is arranged between the annular sealing surface 3 and the spring seat 4 in the fluid passage 2, and the first valve core assembly includes a first valve core 5 and the first spring 6, the two ends of the first spring 6 are respectively against the first valve core 5 and the spring seat 4, and the first valve core 5 is in sealing contact with the annular sealing surface 3 under the action of the first spring 6 , the first valve core 5 is axially provided with a pressure relief hole 51, and the valve body 1 is also provided with a second valve core assembly for blocking the pressure relief hole 51, the second valve core assembly It includes a second valve core 7 and a second spring 8. The second valve core 7 blocks the pressure relief hole 51 under the action of the second spring 8. The opening direction of the second valve core 7 is the same as that of the first valve core. The opening direction of the spool 5 is opposite. Put the one-way valve in this embodiment into the water inlet pipe of the water heater tank, and when water is supplied to the water heater tank, the water pressure in the pipeline overcomes the elastic force of the first spring 6 and pushes the first valve core 5 to move to make it contact with the annular sealing surface. 3 separation, as shown in Figure 2, the water flows into the water heater tank through the one-way valve, and when the water supply to the water heater tank is stopped, the water pressure in the pipeline decreases, and the first valve core 5 is under the action of the first spring 6 It is in sealing contact with the annular sealing surface 3, so that the pipeline is cut off to prevent the water in the water heater tank from backflowing. When the temperature of the hot water in the water heater tank increases and the pressure inside the water heater tank increases sharply and reaches a safe point, as shown in Figure 3 As shown, the internal pressure of the water heater tank produces a large force on the second valve core 7, so that the second valve core 7 overcomes the elastic force of the second spring 8 and moves to open the pressure relief hole 51, and then the water inside the water heater tank flows back through the one-way valve. To the pipeline to achieve the function of backflow and pressure relief, thereby reducing the internal pressure of the water heater tank, making the system (water heater tank) operate in a safe state. The structure of the invention is simplified and reasonable, can prevent backflow when the system is in normal operation, and can backflow and release pressure when the system is overpressured, and has good practicability. In addition to being applied to the water inlet pipe of the water tank of the water heater, the one-way valve in this embodiment can also be used in other bidirectional pressure-bearing environments.

In this embodiment, the first valve core 5 is formed by connecting the first valve disc 52 and the first valve rod 53, and the first valve rod 53 is fixed at the center of the first valve disc 52 and extends towards the direction of the spring seat 4, The first spring 6 is coaxially arranged on the outside of the first valve stem 53, and its two ends respectively abut against the first disc 52 and the spring seat 4, and under the action of the first spring 6, the first valve The petal 52 is in sealing contact with the annular sealing surface 3 , and the pressure relief hole 51 is coaxially disposed on the first valve stem 53 .

Further, the second valve core assembly is installed on the first valve core 5: the second valve core 7 is composed of a second valve disc 71, a second valve stem 72 and a sleeve part 73 connected in sequence, and the first The second valve disc 71 is arranged on the side of the first valve disc 52 facing away from the spring seat 4, and its outer diameter is larger than the diameter of the pressure relief hole 51, and the second valve rod 72 is fixed at the center of the second valve disc 71. And after passing through the pressure relief hole 51, it is fixedly connected with the first end 732 of the sleeve part 73. A gap 721 is provided between the second valve rod 72 and the inner wall of the pressure relief hole 51. On the sleeve part 73 There is a liquid passage hole 731 communicating with the overflow channel 721, the sleeve part 73 is movably fitted between the first spring 6 and the first valve stem 53, and the center of the spring seat 4 is set There is a mounting hole 8 suitable for installing the sleeve part 73, the second spring 8 is installed between the first spring 6 and the first valve stem 53, and its two ends are respectively connected to the first valve disc 52. Against the second end 733 of the sleeve part 73, under the action of the second spring 8, the second valve disc 71 is in sealing contact with the first valve disc 52 to block the pressure relief hole 51, and the sleeve The portion 73 is connected to the first valve stem 53 through a limit structure, so that the sleeve portion 73 and the first valve stem 53 can move axially relative to each other, but cannot be separated. With this structure, when the temperature inside the water heater tank is too high and the internal pressure of the water heater tank increases sharply, the internal pressure of the water heater tank acts on the second valve core 7 to separate the second valve disc 71 from the first valve disc 52. The pressure hole 51 is opened, and the water inside the water heater tank enters into the water inlet pipe through the liquid passage hole 731 and the gap 721; in addition, with the above-mentioned structure, when assembling the product, the first valve core assembly and the second valve core assembly are first assembled. And the spring seat 4 is assembled into an assembly according to the above structure, and then the assembly can be put into the fluid channel 2 of the valve body 1, without the need to put each part into the valve body 1 one by one, the assembly is convenient, and the product can be effectively improved. Assembly efficiency.

Further, the limiting structure includes a limiting groove 734 formed on the inner wall of the sleeve portion 73 and a limiting boss 531 formed on the end of the first valve stem 53 extending radially outward. The position boss 531 is limited to move within the limit slot 734 . The casing part 73 and the first valve stem 53 are effectively limited in movement by the cooperation of the limiting groove 734 and the limiting boss 531, and the structure is simplified and reasonable.

In order to reduce the use of parts and ensure the reliability of product assembly, the spring seat 4 in this embodiment is screwed into the valve body 1, that is, the outer peripheral wall of the spring seat 4 is provided with external threads, and the valve body The internal thread matching the external thread is set at the corresponding position in 1, and the spring seat 4 can be installed by screwing the spring seat 4 with a tool during assembly. The annular sealing surface 2 is integrally formed on the inner wall of the fluid channel 2 , and in practice, the annular sealing surface 2 can also be provided by an annular component fixed in the fluid channel 2 .

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or changes derived from the essential spirit of the present invention still belong to the protection scope of the present invention.

Claims (5)

1. the check valve of decompression function built in a kind of band, axially disposed in the valve body (1) to have for fluid including valve body (1) By fluid channel (2), is fixed at intervals annular sealing surface (3) and spring base (4), the stream in the fluid channel (2) The first core assembly, the first spool group are provided in body channel (2) between the annular sealing surface (3) and spring base (4) Part includes the first spool (5) and the first spring (6), the both ends of first spring (6) respectively with the first spool (5) and spring base (4) it offsets, first spool (5) is in sealing contact with annular sealing surface (3) under the action of the first spring (6), and feature exists In the first spool (5) upper edge is additionally provided in the valve body (1) and is let out for blocking axially through relief hole (51) is provided with Press hole (51) the second core assembly, second core assembly include the second spool (7) and second spring (8), described second Spool (7) in the lower closure relief hole (51) of second spring (8) effect, the opening direction of second spool (7) with it is described The opening direction of first spool (5) is opposite.

2. the check valve of decompression function built in band according to claim 1, which is characterized in that first spool (5) by First flap (52) and the first valve rod (53) connect and compose, and first valve rod (53) is fixed on the first flap (52) center and court Extend to spring base (4) direction, first spring (6) is external with first valve rod (53) is located in, both ends respectively with First flap (52) and spring base (4) offset, first flap (52) and the ring under the action of first spring (6) Shape sealing surface (3) is in sealing contact, and the relief hole (51) is coaxially disposed through on first valve rod (53).

3. the check valve of decompression function built in band according to claim 2, which is characterized in that the second core assembly dress On first spool (5)：Second spool (7) by the second flap (71), the second valve rod (72) and cannula portion (73) successively It connects and composes, for second flap (71) set on first flap (52) back to the side of spring base (4), outer diameter is more than institute State the bore of relief hole (51), second valve rod (72) be fixed on the second flap (71) center and across relief hole (51) afterwards with The first end (732) in described sleeve pipe portion (73) is fixedly connected, and is equipped between second valve rod (72) and relief hole (51) inner wall Gap (721), described sleeve pipe portion (73) are equipped with the liquid pass hole (731) connected with the overflow ducts (721), described sleeve pipe portion (73) between first spring (6) and first valve rod (53), spring base (4) center is equipped with movable set Suitable for installing the mounting hole (8) of described sleeve pipe portion (73), the second spring (8) is installed in first spring (6) and first Between valve rod (53), both ends offset respectively with the first flap (52) and described sleeve pipe portion (73) second end (733), described Second flap (71) and the first flap (52) are in sealing contact under the action of two springs (8) blocks relief hole (51), described Cannula portion (73) is limited by position limiting structure activity with first valve rod (53) and connected.

4. the check valve of decompression function built in band according to claim 3, which is characterized in that the position limiting structure include into Type is in the limiting slot (734) on described sleeve pipe portion (73) inner wall and takes shape in the first valve rod (53) end and radially prolongs The positive stop lug boss (531) stretched, the positive stop lug boss (531) are limited in the limiting slot (734) movable.

5. the check valve of decompression function built in band according to claim 3 or 4, which is characterized in that spring base (4) spiral shell Line is connected in the valve body (1).