CN211501762U - Spring check valve - Google Patents

Abstract

The utility model discloses a spring check valve relates to valve technical field, specifically includes: the valve comprises a valve body, a valve cover and a valve core assembly, wherein the valve core assembly is used for separating a liquid inlet and a liquid outlet on the valve body, the valve core assembly comprises a valve clack, a valve rod and a spring, the top end of the valve rod is positioned in the valve cover and matched with the valve cover in a sliding manner, the bottom end of the valve rod extends to an inner cavity of the valve body and is connected with the top end of the valve clack, the spring is sleeved outside the valve rod, two ends of the spring are respectively connected with the valve clack and the valve cover, a rubber corrugated pipe is sleeved on the outer side of the spring, and. The utility model discloses a with the spring seal in rubber bellows, with its isolated with the fluid medium of valve body inner chamber, avoid the spring to rust and damage, guaranteed spring check valve's normal work, prolonged spring check valve's life.

Description

Spring check valve

Technical Field

The utility model relates to the technical field of valves, in particular to spring check valve.

Background

The check valve is also called a check valve or a check valve. The automatic valve is used in pipeline system and is opened and closed automatically by the force produced by medium flow in pipeline. The spring type check valve controls the opening and closing of the check valve by utilizing the elastic force of the spring, has the characteristics of simple structure, convenience in installation and use, low manufacturing cost and the like, and is popular with the majority of users.

Chinese patent No. CN92242654.6 discloses a check valve, which comprises a valve body and a valve flap, wherein the valve body is provided with a sealing surface, the valve flap is correspondingly provided with a sealing surface, the sealing surface is provided with a sealing pad made of soft elastic material, and the sealing surface is pressed tightly by a pressing plate. In addition, chinese patent No. CN00246642.2 discloses a spring type check valve, which includes a valve body, a support, a valve rod sleeve, a valve rod, a valve flap and a spring, wherein the support is fixed inside the valve body, the valve rod sleeve is disposed on the support, the valve rod is located in the valve rod sleeve, the front end of the valve rod is fixedly connected to the valve flap, the spring is sleeved on the valve rod, a graphite gasket is disposed on the surface of the valve flap, and the graphite gasket is in contact with a metal sealing surface on the inner side of the valve body. However, when the spring check valve is used, the spring is located inside the valve body and is in long-term contact with water or other media passing through the valve body, so that the spring is easily damaged, the service performance of the spring check valve is affected, the spring is not convenient to replace, and the service life of the valve is affected. Secondly, the valve has higher requirements on the size and the amount of used medium impurities, particles in the medium do not reach the standard in some severe environments, the valve switch failure can be caused, and meanwhile, overlarge impurity particles can be clamped between the valve clack and the valve seat to cut a sealing surface, so that the valve leaks.

SUMMERY OF THE UTILITY MODEL

Not enough to above prior art, the utility model aims to provide a spring check valve, through with the spring seal in rubber bellows, with its isolated with the fluid medium of valve body inner chamber, avoid the spring to rust and damage, guaranteed spring check valve's normal work, prolonged spring check valve's life.

In order to achieve the above object, the present invention is specifically realized by the following techniques:

the utility model provides a spring check valve, includes valve body, valve gap and case subassembly, the case subassembly is used for cutting off inlet and liquid outlet on the valve body, the case subassembly includes valve clack, valve rod and spring, the valve rod top is located in the valve gap and with the valve gap cooperation of sliding, the valve rod bottom extends to the valve body inner chamber and with the valve clack top is connected, the spring suit in outside the valve rod, just the both ends of spring respectively with valve clack and valve gap connection, rubber bellows is established to the outside cover of spring, just rubber bellows and valve gap bottom sealing connection.

Adopt above-mentioned technical scheme: the rubber corrugated pipe is arranged at the periphery of the spring, the spring is sealed in the rubber corrugated pipe to isolate external media, so that the spring is not contacted with the media flowing in the inner cavity of the valve body, the spring is prevented from being rusted and damaged, and the normal work of the spring check valve is ensured; meanwhile, when the check valve is closed, the deformation force of the rubber corrugated pipe and the spring is the same, and the closing speed of the check valve can be accelerated.

Furthermore, a positioning bulge is arranged on the valve rod along the axial direction of the valve rod, and the positioning bulge is connected with the valve cover key; the valve rod can only move along the axial direction of the valve rod by the limiting action of the positioning bulge in the key groove, and the spring and the valve clack are prevented from rotating relatively at a large angle.

Further, the rubber corrugated pipe is connected with the valve cover in a screw sealing mode, and a gasket is arranged between the rubber corrugated pipe and the valve cover. When the spring needs to be replaced, the valve cover is detached firstly, then the screw is unscrewed, the rubber corrugated pipe is taken out together with the valve core assembly, then the spring is drawn out, the replacement can be carried out, and the detachment is convenient.

Further, the rubber bellows is made of an elastic material resistant to aging and corrosion, such as polytetrafluoroethylene.

Further, the inlet of valve body department is equipped with the filter screen, the filter screen is the arc. The filter screen intercepts granular impurities in the medium, so that the impurities are prevented from contacting with the valve clack and damaging the sealing surface, and the service life of the valve is prolonged; the filtering area of the arc-shaped structure is increased, and the filtering efficiency is improved.

Furthermore, an end cover is arranged at the position of the valve body, which is right below the filter screen, one end of the end cover is pivoted with the valve body, and the other end of the end cover is detachably connected with the valve body; the staff is convenient to open the end cover regularly and clear up the impurity of deposit in it.

Furthermore, a dish-shaped rubber ring is arranged at the joint of the end cover and the valve body, and a convex part of the dish-shaped rubber ring faces the valve body. Adopt dish-shaped rubber circle, have great elasticity, can play good pressure compensation effect, easily take place to warp under the atmospheric pressure change with better sealed end cover and valve body junction, prevent that the medium from flowing from the end cover.

The utility model discloses a working process does: the medium enters the valve body from the liquid inlet, the valve clack is pushed upwards by medium pressure overcoming the gravity of the valve clack and the elasticity of the spring and the rubber corrugated pipe, so that the sealing surface of the valve clack is separated from the corresponding sealing surface of the valve body to form a medium flow channel, and the medium can flow from the liquid inlet to the liquid outlet; the spring is now sealed in the rubber bellows and not in contact with the fluid. When the medium stops flowing or has a tendency of flowing in the opposite direction, the valve clack falls under the action of the gravity of the valve clack and the elastic force of the spring and the rubber corrugated pipe, the sealing surface of the valve clack is tightly attached to the sealing surface of the valve body again, the channel is sealed, and the medium is prevented from flowing in the opposite direction.

The utility model has the advantages that:

1. the spring is sealed in the rubber corrugated pipe and isolated from the fluid medium in the inner cavity of the valve body, so that the spring is prevented from rusting and being damaged, the normal work of the spring check valve is ensured, and the service life of the spring check valve is prolonged.

2. Set up the filter screen in inlet port department, filter the impurity in the medium, improved the life of valve, reduced the fault rate, and the connection can be dismantled to the lower extreme of valve body, makes things convenient for the staff to regularly open the end cover, clears up sedimentary impurity in it.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a spring check valve of embodiment 1;

FIG. 2 is a schematic structural view of the spring check valve of embodiment 1 in an operating state;

FIG. 3 is a schematic view of the structure of the valve stem and the positioning projection of the embodiment 1 which are matched with the valve cover;

FIG. 4 is a schematic structural view of a spring check valve of embodiment 2;

in the figure, 1, a valve body; 11. a liquid inlet; 12. a liquid outlet; 2. a valve cover; 21. blind holes; 22. a keyway; 3. a valve core assembly; 31. a valve flap; 32. a valve stem; 33. a spring; 34. a spring seat; 35. positioning the projection; 36. a rubber bellows; 37. a gasket; 4. a filter screen; 5. an end cap; 6. and fastening the bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Example 1

A spring check valve, refer to fig. 1-2, including the valve block 1, locate the valve bonnet 2 above the said valve block 1 and locate the valve core assembly 3 of the cavity of the said valve block 1, the said valve block 1 is fastened with the valve bonnet 2 through the bolt, in order to make the check valve in operation, the medium transported does not leak, the said valve block 1 is equipped with the O-ring seal with the interface of the valve bonnet 2, tighten the bolt, press the O-ring seal on the valve block 1 tightly through the valve bonnet 2, in order to prevent the medium of the cavity of the valve block 1 from leaking out; the valve core assembly 3 is used for separating a liquid inlet 11 and a liquid outlet 12 on the valve body 1, the valve core assembly 3 comprises a valve clack 31, a valve rod 32 and a spring 33, a sealing surface is arranged on the periphery of the lower end of the valve clack 31 and is in sealing fit with the sealing surface of the opposite valve body 1, the top end of the valve rod 32 is positioned in the valve cover 2 and is in sliding fit with the valve cover 2, specifically, a blind hole 21 used for accommodating the valve rod 32 is arranged in the center of the valve cover 2, the top end of the valve rod 32 extends into the blind hole 21 and can slide in the blind hole 21, and the height of the blind hole 21 is consistent with; a positioning bulge 35 is arranged on the valve rod 32 along the axial direction of the valve rod, and the positioning bulge 35 is in key connection with the valve cover 2; specifically, referring to fig. 3, a key slot 22 extends longitudinally on the valve cap 2, the key slot 22 is communicated with the blind hole 21, and the positioning protrusion 35 is matched with the key slot 22; the valve rod 32 can only move along the axial direction of the positioning protrusion 35 under the limiting action in the key slot 22, and the spring 33 and the valve clack 31 are prevented from rotating relatively at a large angle; the bottom end of the valve rod 32 extends to the inner cavity of the valve body 1 and is connected with the top end of the valve clack 31, the spring 33 is sleeved outside the valve rod 32, two ends of the spring 33 are respectively connected with the valve clack 31 and the valve cover 2 through a spring 33 seat, namely two ends of the spring 33 are respectively abutted against the valve clack 31 and the valve cover 2, the outer side of the spring 33 is sleeved with a rubber corrugated pipe 36, the rubber corrugated pipe 36 is made of ageing-resistant and corrosion-resistant elastic materials such as polytetrafluoroethylene, and the rubber corrugated pipe 36 is hermetically connected with the bottom end of the valve cover 2; specifically, a screw connection (not shown) may be adopted, and a gasket 37 is disposed between the rubber bellows 36 and the valve cover 2; when the spring 33 needs to be replaced, the screw is unscrewed, the rubber corrugated pipe 36 and the valve core assembly 3 are taken out together, then the spring 33 is drawn out, and replacement can be performed, and the disassembly is convenient.

Adopt above-mentioned technical scheme: the spring 33 is sealed in the rubber corrugated pipe 36 and isolated from the fluid medium in the inner cavity of the valve body 1, so that the spring 33 is prevented from rusting and being damaged, the normal work of the check valve of the spring 33 is ensured, and the service life of the check valve of the spring 33 is prolonged.

Example 2

The embodiment 2 is basically the same as the embodiment 1, and the difference is that referring to fig. 4, a filter screen 4 is arranged at a liquid inlet 11 of the valve body 1, and the filter screen 4 is arc-shaped; and the valve body 1 is located the position under the filter screen 4 is equipped with end cover 5, 5 one end of end cover with the pin joint of valve body 1, 5 other ends of end cover with the valve body 1 can be dismantled and be connected, and is concrete, accessible fastening bolt 6 is fixed. In order to enhance the sealing effect, a disk-shaped rubber ring (not shown in the figure) is arranged at the joint of the end cover 5 and the valve body 1, and the convex part of the disk-shaped rubber ring faces the valve body 1.

Adopt above-mentioned technical scheme: set up filter screen 4 in inlet 11 department, filter the particulate impurity in the medium, avoid impurity and valve clack 31 contact, damage sealed face, improved the life of valve, reduced the fault rate, and the connection can be dismantled to the lower extreme of valve body 1, makes things convenient for the staff to regularly open end cover 5, clears up sedimentary impurity in it.

Claims (7)

1. A spring check valve comprises a valve body (1), a valve cover (2) and a valve core assembly (3), the valve core component (3) is used for separating a liquid inlet (11) and a liquid outlet (12) on the valve body (1), characterized in that the valve core component (3) comprises a valve clack (31), a valve rod (32) and a spring (33), the top end of the valve rod (32) is positioned in the valve cover (2) and is in sliding fit with the valve cover (2), the bottom end of the valve rod (32) extends to the inner cavity of the valve body (1) and is connected with the top end of the valve clack (31), the spring (33) is sleeved outside the valve rod (32), two ends of the spring (33) are respectively connected with the valve clack (31) and the valve cover (2), the outer side of the spring (33) is sleeved with a rubber corrugated pipe (36), and the rubber corrugated pipe (36) is connected with the bottom end of the valve cover (2) in a sealing way.

2. A spring check valve according to claim 1, characterized in that the valve stem (32) is provided with a positioning projection (35) along its axial direction, the positioning projection (35) being keyed with the valve cap (2).

3. A spring check valve according to claim 1, characterized in that the rubber bellows (36) is screwed to the valve cover (2) and a gasket (37) is provided between the rubber bellows (36) and the valve cover (2).

4. A spring check valve according to claim 1, characterized in that said rubber bellows (36) is made of an elastic material resistant to ageing and corrosion.

5. The spring check valve according to any one of claims 1 to 4, characterized in that a filter screen (4) is disposed at the liquid inlet (11) of the valve body (1), and the filter screen (4) is arc-shaped.

6. A spring check valve according to claim 5, characterized in that an end cover (5) is arranged at a position of the valve body (1) right below the filter screen (4), one end of the end cover (5) is pivoted with the valve body (1), and the other end of the end cover (5) is detachably connected with the valve body (1).

7. A spring check valve according to claim 6, characterized in that a disk-shaped rubber ring is arranged at the connection of the end cap (5) and the valve body (1), and the raised part of the disk-shaped rubber ring faces the valve body (1).

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