Damping type check valve

Abstract

The invention provides a damping type check valve. The damping type check valve comprises a guide seat, a valve element, a guide sleeve, a fastener, a valve clack, a guide rod and a spring. A damping space is arranged along the axis of the guide sleeve in a penetrating manner; a damping structure formed by the guide sleeve, the fastening piece, the spring and the damping space is independent of the valve element, the damping function is not limited, the guide sleeve and the fastening piece are detachably connected, so that parts are more convenient to maintain or replace, the maintenance cost is reduced, the maintenance time is shortened, the service life of the check valve is prolonged, and the reliability of the check valve is improved. The fastener comprises a copper cap and a cylindrical plug, a spiral groove is formed in the outer surface of the cylindrical plug, and the through hole is communicated with the damping space through the spiral groove; the sealing performance and the damping effect of the damping structure are ensured through close fit of the cylindrical plug and the copper cap, and when the cylindrical plug serving as an inlet and an outlet of the damping space is blocked, the problem that the damping space is blocked can be rapidly solved only by replacing the fastener.

Description

Technical Field

[0001] The present invention relates to a check valve, in particular to a damping check valve. Background Art

[0002] Traditional check valves have limitations in refrigeration systems. While traditional check valves (swing, lift, and spring-loaded) provide one-way shutoff, they are susceptible to significant water hammer. This is particularly true when the refrigeration system is started or shut down, or when the load changes suddenly. The sudden change in fluid velocity can easily trigger "water hammer" (hydraulic shock), leading to increased pipe vibration and noise, and even damage to valve sealing surfaces or pipe ruptures. For example, when a large chiller is shut down, the pressure differential between the condenser and evaporator can cause rapid refrigerant backflow. The impact force generated by the rapid closing of a traditional check valve can reach several times the normal operating pressure.

[0003] Check valves with damping function utilize a built-in damping device to control the opening and closing speed of the disc, significantly improving the performance of traditional check valves. The damping device gradually decelerates the disc during closing, reducing peak water hammer pressure by over 50% and effectively suppressing load shock.

[0004] However, the damping fluid storage chamber is formed inside the valve core, and the inlet and outlet channels of the damping fluid storage chamber are required to be small. When impurities in the fluid enter the inlet and outlet channels and block the inlet and outlet channels, the damping function of the check valve will be destroyed. At this time, the check valve can only be replaced as a whole, which will increase maintenance costs and time. Summary of the Invention

[0005] In order to address the shortcomings of the existing technology, the present invention provides a damping check valve, in which the damping space exists independently of the valve core, the local parts are easy to disassemble and replace, and the tight fit of the fasteners ensures the sealing and damping effects. The technical solution adopted by the present invention is: A damping check valve, comprising: A guide seat, on which a guide groove for fluid to pass through is provided; a valve core, located at the center of one side of the guide seat; A guide sleeve is inserted into the valve core from the end of the valve core away from the guide seat until it stops, and a damping space is provided along the axis of the guide sleeve; A fastener, comprising a copper cap and a cylindrical plug, wherein the copper cap is inserted into the valve core from an end of the valve core close to the guide seat and is detachably connected to the guide sleeve so that the guide sleeve and the fastener are tightly fitted on the valve core, a through hole is provided along the axis of the copper cap, the cylindrical plug is tightly fitted in the through hole, and a spiral groove is provided on the outer surface of the cylindrical plug, the spiral groove connecting the through hole with the damping space; a valve disc and a guide rod, wherein one end of the guide rod is connected to the valve disc and the other end is inserted into the damping space; a spring disposed in the damping space, with its two ends respectively abutting against the guide rod and the copper cap, wherein when the valve disc approaches the valve core, the spring force increases, and when the valve disc moves away from the valve core, the spring force decreases; Wherein, the guide seat, valve core, guide sleeve, fastener, valve disc and guide rod are coaxially arranged.

[0006] Furthermore, the guide sleeve further comprises: A shaft shoulder abuts against an end of the valve core away from the guide seat; The O-type sealing ring is used to seal the radial gap between the guide sleeve and the valve core.

[0007] Furthermore, it also includes: The gasket is sleeved on the guide sleeve and squeezed between the shaft shoulder and the valve core.

[0008] Furthermore, the copper cap is continuously provided with a first step and a second step along its axis, so that the copper cap forms a first column segment, a second column segment and a third column segment connected to each other; One end of the spring abuts against the first step; One end of the guide sleeve close to the guide seat abuts against the second step; The second column section is threadedly connected to the inner wall of the damping space; The third column section is located on a side of the valve core close to the guide seat.

[0009] Furthermore, one end of the through hole close to the guide seat is processed into a hexagonal hole.

[0010] Furthermore, the valve core includes: The inner ring of the valve core, the shaft shoulder abuts against an end of the inner ring of the valve core away from the guide seat; The outer ring of the valve core has a parabolic cross section, an end thereof away from the guide seat is open, and an end thereof close to the guide seat is connected with the inner ring of the valve core.

[0011] Furthermore, the valve flap includes: Valve body; A valve flap cover is spherically arranged on a side of the valve flap body away from the guide seat; A check valve sealing ring, covering the side surface of the valve disc body; A countersunk bolt passes through the valve flap cover and extends into the valve flap body to be threadedly connected to the guide rod, so that the valve flap cover and the guide rod are tightly fitted on the valve flap body.

[0012] Furthermore, the valve flap body is spherical with its opening facing the guide seat, the valve flap body protrudes away from the outer arc surface of the guide seat to form an outer limit, and the edge of the valve flap cover abuts against the edge of the outer limit.

[0013] Furthermore, an inner limiter is provided on the inner arc surface of the valve disc body extending toward the guide seat, and one end of the guide rod extends into the inner limiter.

[0014] Furthermore, an exhaust hole is provided on the valve flap cover.

[0015] Advantages of the present invention: The damping structure formed by the guide sleeve, fasteners, spring, and damping space exists independently of the valve core, and the damping function is not restricted. In addition, the detachable connection between the guide sleeve and the fastener makes it more convenient to repair or replace parts. Only the fasteners and guide sleeve need to be removed to inspect, repair, or replace the valve core without replacing the entire check valve. This can reduce maintenance costs and time and improve the service life and reliability of the check valve. In the fastener, the tight fit between the cylindrical plug and the copper cap ensures the sealing performance and damping effect of the damping structure. When the cylindrical plug, which serves as the inlet and outlet of the damping space, is blocked, the problem of the damping space blockage can be quickly solved by simply replacing the fastener. The maximum compression of the spring can be adjusted by the gasket, which is suitable for use in environments with different flow rates. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structural composition of the present invention.

[0017] Figure 2 This is a usage state diagram of the present invention.

[0018] Figure 3 Schematic diagram of the structural composition of the fastener.

[0019] In the figure: 100-guide seat, 110-guide groove, 200-valve core, 210-valve core inner ring, 220-valve core outer ring, 300-guide sleeve, 310-shaft shoulder, 320-O-ring, 400-fastener, 410-copper cap, 410a-first column section, 410b-second column section, 410c-third column section, 411-through hole, 412-first step, 413-second step, 414-hexagonal hole, 420-cylinder plug, 421-spiral groove, 500-valve disc, 510-valve disc body, 511-external limit, 512-inner limit, 520-valve disc cover, 521-exhaust hole, 530-check valve sealing ring, 540-countsunk bolt, 600-guide rod, 700-spring, 800-gasket. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Please see the attached Figure 1 -Attached Figure 3 The present application proposes a damping check valve, comprising a coaxially arranged guide seat 100, a valve core 200, a guide sleeve 300, a fastener 400, a valve disc 500, a guide rod 600, and a spring 700.

[0022] The guide seat 100 is provided with a guide groove 110 for fluid to pass through. The guide seat 100 supports and secures the valve core 200. During use, the guide seat 100 is fixed to the inner wall of the pipe, and a sealing ring on its cylindrical surface is used to achieve a seal. When the check valve is installed in the refrigeration equipment pipe and remains open, the refrigerant (i.e., fluid) can flow through the guide seat 100 through the guide groove 110 and into the downstream of the pipe. In one embodiment, there are multiple guide grooves 110, which are arranged circumferentially along the axis of the guide seat 100. The valve core 200 is located at the center of one side of the guide seat 100. The valve core 200 and the guide seat 100 are an integral structure. When the check valve is installed in the refrigeration equipment pipe and remains open, the refrigerant is guided from the outer wall of the valve core 200 into the guide groove 110, thereby performing a diversion function.

[0023] The guide sleeve 300 is inserted into the valve core 200 from the end thereof away from the guide seat 100 until it stops, and a damping space is provided along the axis of the guide sleeve 300; the fastener 400 includes a copper cap 410 and a cylindrical plug 420, and the copper cap 410 is inserted into the valve core 200 from the end thereof close to the guide seat 100 and is detachably connected to the guide sleeve 300, so that the guide sleeve 300 and the fastener 400 are tightly fitted on the valve core 200. A through hole 411 is provided along the axis of the copper cap 410, and the cylindrical plug 420 is tightly fitted in the through hole 411. A spiral groove 421 is provided on the outer surface of the cylindrical plug 420, and the spiral groove 421 connects the through hole 411 with the damping space; when the axial distance into the damping space is constant, the spiral groove 411 can increase the flow stroke of the fluid, making the reset action of the valve disc 500 slower, further improving the damping effect; the connection between the fastener 400 and the guide sleeve 300 The damping space exists independently of the valve core 200. Even if there is an installation gap or installation error between the guide sleeve 300 and the valve core 200, or between the fastener 400 and the valve core 200, the sealing performance and damping effect of the damping space will not be affected. In the fastener 400, the tight fit between the copper cap 410 and the cylindrical plug 420 ensures the sealing effect and can also be disassembled. When the spiral groove 421, which serves as the inlet and outlet channel of the damping space, is blocked, the fastener 400 can be replaced, or the cylindrical plug 420 can be removed to clean the spiral groove 421. A variety of treatment methods can ensure that the check valve is quickly put into use again. In addition, the fastener 400 is detachably connected to the guide sleeve 300, making it more convenient to repair or replace parts of the check valve. Only the fastener 400 and the guide sleeve 300 need to be removed to inspect, repair or replace the guide seat 100 and the valve core 200 without replacing the check valve as a whole. This not only reduces maintenance costs and time, but also ensures the reliability of the check valve.

[0024] One end of the guide rod 600 is connected to the valve disc 500, and the other end is inserted into the damping space; the spring 700 is arranged in the damping space, and its two ends respectively abut the guide rod 600 and the copper cap 410. When the valve disc 500 approaches the valve core 200, the elastic force of the spring 700 increases, and when the valve disc 500 moves away from the valve core 200, the elastic force of the spring 700 decreases; the guide rod 600 is a hollow structure, and the length of the damping space is extended, so that a longer spring 700 can be installed. When the check valve is installed in the pipeline, the valve disc 500 is used to block the pipeline opening, and the opening and closing action is completed in conjunction with whether the fluid in the pipeline passes through. Therefore, when refrigerant flows into the pipeline, the check valve is passively opened, and the valve disc 500 is pressed toward the valve core 200 and finally snaps onto the valve core 200. At the same time, the guide rod 600 slides along the inner wall of the guide sleeve 300, compressing the damping space. When the spring 700 is compressed, the fluid in the damping space is discharged through the spiral groove 421. When the pressure on the valve disc 500 suddenly disappears, the guide rod 600 is reset under the elastic force of the spring 700. At this time, the fluid re-enters the damping space through the spiral groove 421, and the damping space expands until the valve disc 500 blocks the pipeline opening again. The damping function is used to slow down the check action and avoid water hammer.

[0025] Please see the attached Figure 1 , a stopping method of the guide sleeve 300 is: the guide sleeve 300 further includes a shaft shoulder 310, which abuts against the end of the valve core 200 away from the guide seat 100; Figure 1 The installation method of the guide sleeve 300 is described based on the positional relationship in the figure. The guide sleeve 300 is inserted into the valve core 200 from top to bottom until the shaft shoulder 310 contacts the top of the valve core 200. The upper end of the guide sleeve 300 is positioned under the restriction of the shaft shoulder 310, and then the guide sleeve 300 is installed from the lower end of the valve core 200 using the fastener 400 to complete the mutual fixation between the valve core 200, the guide sleeve 300 and the fastener 400.

[0026] Furthermore, in this embodiment, in order to ensure the sealing performance between the guide sleeve 300 and the valve core 200 and reduce the radial error, at least two O-rings 320 are arranged at intervals on the cylindrical surface of the guide sleeve 300 to seal the radial gap between the guide sleeve 300 and the valve core 200.

[0027] Please see the attached Figure 1 In this embodiment, a gasket 800 is further included, which is sleeved on the guide sleeve 300 and squeezed between the shaft shoulder 310 and the valve core 200. The gasket 800 increases the radial friction between the guide sleeve 300 and the valve core 200, thereby reducing the radial installation error of the guide sleeve 300.

[0028] As another stopping method of the guide sleeve 300, the outer surface of the guide sleeve 300 is a conical surface (not shown) to attach Figure 1 The installation method of the guide sleeve 300 is described based on the positional relationship in the figure. The diameters of the two ends of the guide sleeve 300 are larger at the top and smaller at the bottom. The guide sleeve 300 is inserted into the valve core 200 from top to bottom until the middle diameter of the guide sleeve 300 is the same as the hole diameter on the valve core 200. The upper end of the guide sleeve 300 is positioned within the limitation of the diameter of the guide sleeve 300 itself, and then the guide sleeve 300 is installed from the lower end of the valve core 200 using the fastener 400 to complete the mutual fixation between the valve core 200, the guide sleeve 300 and the fastener 400.

[0029] In one embodiment, please refer to the attached Figure 1 and attached Figure 3 The specific structure of the copper cap 410 is as follows: a first step 412 and a second step 413 are continuously provided on the copper cap 410 along its axis, so that the copper cap 410 forms a connected first column segment 410a, a second column segment 410b and a third column segment 410c; one end of the spring 700 abuts against the first step 412; one end of the guide sleeve 300 close to the guide seat 100 abuts against the second step 413; the second column segment 410b is threadedly connected to the inner wall of the damping space; the third column segment 410c is located on the side of the valve core 200 close to the guide seat 100.

[0030] Attach Figure 1 The threaded connection relationship between the fastener 400 and the guide sleeve 300 is described based on the positional relationship in the figure. Specifically, the cylindrical surface of the second column segment 410b is processed with an external thread, and the guide sleeve 300 is processed with a threaded hole on the bottom inner wall of the damping space. When the second column segment 410b is threaded into the threaded hole, the first column segment 410a smoothly enters the damping space because its diameter is smaller than the diameter of the damping space. The bottom end of the spring 700 is inserted into the first column segment 410a and abuts on the first step 412; the second step 413 gradually approaches the bottom end of the guide sleeve 300 as the second column segment 410b is screwed in, which can be used to adjust the initial elastic force of the spring 700. Finally, the diameter of the third column segment 410c is larger than the outer diameter of the guide sleeve 300, so that the bottom end of the valve core 200 can abut against the bottom surface of the second step 413. Finally, the shaft shoulder 310 and the third column segment 410c are used to complete the installation and positioning of the fastener 400 and the guide sleeve 300 on the valve core 200.

[0031] In this embodiment, in order to facilitate the rotation of the fastener 400 and complete the threaded installation, the through hole 411 is processed into a hexagonal hole 414 at one end close to the guide seat 100 .

[0032] In this embodiment, in order to reduce the sharpness of the third column segment 410 c , the surface of the third column segment 410 c close to the guide seat 100 (ie, the bottom of the third column segment 410 c ) is processed into a spherical surface.

[0033] In this application, please see the attached Figure 1 The valve core 200 includes: a valve core inner ring 210, with the shoulder 310 abutting against the end of the valve core inner ring 210 away from the guide seat 100; and a valve core outer ring 220, which has a parabolic cross-section, an open end away from the guide seat 100, and an end adjacent to the guide seat 100, connected to the valve core inner ring 210. The combination of the valve core inner ring 210 and the valve core outer ring 220 reduces the overall weight of the valve core 200. The valve core inner ring 210 provides a positioning position for the guide sleeve 300 to be inserted, while the outer surface of the valve core outer ring 220 provides a flow guide surface for the fluid.

[0034] In one embodiment, please refer to the attached Figure 1 The valve flap 500 includes: a valve flap body 510; a valve flap cover 520, which is spherically arranged on the side of the valve flap body 510 away from the guide seat 100; a check valve sealing ring 530, which covers the side of the valve flap body 510; a countersunk bolt 540, which passes through the valve flap cover 520 and extends into the valve flap body 510 and is threadedly connected to the guide rod 600, so that the valve flap cover 520 and the guide rod 600 are tightly fitted on the valve flap body 510. Specifically, a threaded hole is processed on the top of the guide rod 600, and the head of the countersunk bolt 540 is used to press and fix the valve flap cover 520, and the guide rod 600 is fastened by a threaded connection, so that the guide rod 600 and the valve flap 500 form a whole. During installation, it is only necessary to insert the guide rod 600 into the damping space; the valve flap 500 is assembled. When the valve flap cover 520 is facing the fluid and is worn by the fluid, when the check valve sealing ring 530 is deformed and causes refrigerant leakage, and when the guide rod 600 is worn or deformed, the valve flap 500 can be replaced with new parts and reassembled by removing the countersunk bolt 540.

[0035] In this embodiment, the valve flap body 510 is spherical with its opening facing the guide seat 100. The outer arc surface of the valve flap body 510 protrudes away from the guide seat 100 to form an outer limit 511. The edge of the valve flap cover 520 abuts against the edge of the outer limit 511. The inner arc surface of the valve flap body 510 extends toward the guide seat 100 to form an inner limit 512. One end of the guide rod 600 extends into the inner limit 512. Figure 1The installation process of the valve flap cover 520 and the guide rod 600 is described based on the positional relationship in the figure. The top of the guide rod 600 is inserted into the cylindrical inner limit 512, and then the valve flap cover 520 is covered on the valve flap body 510 from top to bottom. The edge of the valve flap cover 520 is buckled on the outer edge of the outer limit 511, and the edge of the valve flap cover 520 is positioned using the outer limit 511. At this time, the hole on the axis of the valve flap cover 520 coincides with the axis of the threaded hole on the guide rod 600, and the valve flap cover 520 cannot shake radially. The valve flap body 510 axially positions the valve flap cover 520 and the guide rod 600 respectively, and then the guide rod 600 is fixed with the countersunk bolt 540 to ensure the coaxial fixation between the guide rod 600 and the valve flap 500.

[0036] The spherical structures of the valve flap body 510 and the valve flap cover 520 face the direction of the refrigerant flushing, which is convenient for guiding the refrigerant.

[0037] In this embodiment, the valve flap cover 520 is provided with an exhaust hole 521 . When the outer limiter 511 is engaged with the valve flap cover 520 , the air between the valve flap body 510 and the valve flap cover 520 is exhausted from the exhaust hole 521 .

[0038] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A damping check valve, characterized in that: include: A guide seat (100) is provided with a guide groove (110) for fluid to pass through; A valve core (200) is located at the center of one side of the guide seat (100); A guide sleeve (300) is inserted into the valve core (200) from one end of the valve core (200) away from the guide seat (100) until it stops, and a damping space is provided along the axis of the guide sleeve (300); A fastener (400) includes a copper cap (410) and a cylindrical plug (420), wherein the copper cap (410) is inserted into the valve core (200) from one end of the valve core (200) close to the guide seat (100) and is detachably connected to the guide sleeve (300), so that the guide sleeve (300) and the fastener (400) are tightly fitted on the valve core (200), a through hole (411) is provided along the axis of the copper cap (410), and the cylindrical plug (420) is tightly fitted in the through hole (411), and a spiral groove (421) is provided on the outer surface of the cylindrical plug (420), and the spiral groove (421) connects the through hole (411) with the damping space; A valve flap (500) and a guide rod (600), wherein one end of the guide rod (600) is connected to the valve flap (500) and the other end is inserted into the damping space; A spring (700) is arranged in the damping space, with its two ends respectively abutting against the guide rod (600) and the copper cap (410); when the valve flap (500) approaches the valve core (200), the elastic force of the spring (700) increases; and when the valve flap (500) moves away from the valve core (200), the elastic force of the spring (700) decreases.

2. The damping check valve according to claim 1, characterized in that: The guide sleeve (300) further includes: The shaft shoulder (310) abuts against an end of the valve core (200) away from the guide seat (100).

3. The damping check valve according to claim 2, characterized in that: Also includes: The gasket (800) is sleeved on the guide sleeve (300) and is squeezed between the shaft shoulder (310) and the valve core (200).

4. The damping check valve according to any one of claims 1 to 3, characterized in that: The copper cap (410) is continuously provided with a first step (412) and a second step (413) along its axis, so that the copper cap (410) forms a connected first column segment (410a), a second column segment (410b) and a third column segment (410c); One end of the spring (700) abuts against the first step (412); One end of the guide sleeve (300) close to the guide seat (100) abuts against the second step (413); The second column section (410b) is threadedly connected to the inner wall of the damping space; The third column section (410c) is located on a side of the valve core (200) close to the guide seat (100).

5. The damping check valve according to claim 4, characterized in that: One end of the through hole (411) close to the guide seat (100) is processed into a hexagonal hole (414).

6. The damping check valve according to claim 2 or 3, characterized in that: The valve core (200) comprises: The valve core inner ring (210), the shaft shoulder (310) abuts against an end of the valve core inner ring (210) away from the guide seat (100); The valve core outer ring (220) has a parabolic cross-section, an end thereof away from the guide seat (100) is open, and an end thereof close to the guide seat (100) is connected to the valve core inner ring (210).

7. The damping check valve according to any one of claims 1 to 3, characterized in that: The valve flap (500) comprises: Valve body (510); A valve flap cover (520) is spherically arranged on a side of the valve flap body (510) away from the guide seat (100); A check valve sealing ring (530) covering the side surface of the valve disc body (510); The countersunk bolt (540) passes through the valve flap cover (520) and extends into the valve flap body (510) to be threadedly connected to the guide rod (600), so that the valve flap cover (520) and the guide rod (600) are tightly fitted on the valve flap body (510).

8. The damping check valve according to claim 7, wherein: The valve flap body (510) is spherical with its opening facing the guide seat (100), and the valve flap body (510) protrudes from the outer arc surface away from the guide seat (100) to form an outer limit (511), and the edge of the valve flap cover (520) abuts against the edge of the outer limit (511).

9. The damping check valve according to claim 8, characterized in that: An inner limiter (512) is provided on the inner arc surface of the valve flap body (510) extending toward the guide seat (100), and one end of the guide rod (600) extends into the inner limiter (512).

10. The damping check valve according to claim 7, wherein: The valve flap cover (520) is provided with an exhaust hole (521).

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