A propeller check valve suitable for use with clean and non-clean media

Abstract

The application discloses a kind of axial flow check valve suitable for cleaning and non-cleaning medium, including valve body, valve core and pressure ring, the pitch of spring on valve core is designed as the pitch under limit compression state (full open) is greater than 3 times steel wire diameter, impurities in medium cannot be stuck between spring, while spring relative rigidity is big and positive and negative double helix structure has radial stability and axial closing thrust stability, solve the problem of ring disc type fatigue;Moving part (valve core) is full floating structure, valve core does not need to open and close motion guide valve shaft or rotating arm, there is no risk of sticking and jamming of sliding pair or rotating pair, high viscosity, impurity-containing medium can easily pass through valve inner flow channel, without affecting valve core opening and closing action.The beneficial effects of the application are that the valve core is fully floating during opening and closing, the spring has a self-cleaning effect, which can improve the closing speed of the valve and ensure the stable and reliable opening and closing of the valve.

Description

Technical Field

[0001] This invention relates to the field of axial flow check valve technology, and in particular to an axial flow check valve suitable for both clean and unclean media. Background Technology

[0002] Conventional axial flow check valves are generally of double-support, single-support, and floating ring disc type structures. Single-support and double-support axial flow check valves are generally suitable for clean media. However, clean media often contain impurities. For example, naturally clarified water and quenched oil often contain impurities such as mud, sand, and coking matter. These impurities can enter the sliding pair and cause the valve to stick or jam, thus losing its basic function. Floating ring disc type axial flow check valves perform better than supported types in non-clean media. However, floating ring disc type axial flow check valves suffer from uneven force distribution on multiple springs, and the guide plate is prone to failure under the weight of the valve disc, leading to the valve losing its reset function. Summary of the Invention

[0003] The purpose of this invention is to provide an axial flow check valve suitable for both clean and unclean media, so as to solve the problems existing in the prior art, and to provide reliable opening and closing and self-cleaning under high viscosity and impurity media conditions.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides an axial flow check valve suitable for both clean and unclean media, comprising...

[0005] Valve body, wherein a valve cavity is formed within the valve body; and

[0006] A valve core, installed in the valve cavity of the valve body, comprises a valve disc, a spring, and a positioning ring connected in sequence. The valve disc abuts against the opening / closing port in the valve cavity. The spring is a double helical spring, one end of which is fixed to the valve disc, and the other end is fixedly connected to the front end of the positioning ring. The positioning ring has a flow port.

[0007] A pressure ring is fitted at the end of the valve body, and the pressure ring abuts against the end of the positioning ring. The pressure ring is used to limit the position of the valve core.

[0008] Preferably, the valve body includes a first chamber, a second chamber, and a third chamber that are sequentially connected from front to back, and the transition section between the first chamber and the second chamber is the opening and closing port of the valve chamber.

[0009] Preferably, the transition section between the first chamber and the second chamber adopts a necked structure, and the front end of the valve disc is sealed and fitted at the necked position on the rear side of the transition section between the first chamber and the second chamber.

[0010] Preferably, the valve core is located in the second chamber, and the two helices of the double-helix portion of the spring have opposite directions of rotation.

[0011] Preferably, the positioning ring is provided with a circumferential flow port, the interior of the positioning ring is a flow cavity, the flow port is connected to the flow cavity, and the end of the flow cavity is connected to the third chamber.

[0012] Preferably, the pressure ring is located in the third chamber, and the pressure ring abuts against the outer wall of the flow cavity of the positioning ring.

[0013] The present invention achieves the following beneficial technical effects compared to the prior art:

[0014] This invention relates to an axial flow check valve suitable for both clean and unclean media, comprising a valve body, a valve core, and a pressure ring. The spring pitch on the valve core is designed to be greater than three times the wire diameter under extreme compression (fully open), preventing impurities in the medium from becoming stuck between the springs. Simultaneously, the high relative stiffness of the springs and the double-helix structure provide radial stability and axial closing thrust stability, solving the fatigue problem of ring-type valves. The moving part (valve core) is a fully floating structure, eliminating the need for a valve shaft or rotating arm to guide its opening and closing motion. This eliminates the risk of jamming or stuck sliding or rotating pairs, allowing high-viscosity media and media containing impurities to easily pass through the valve's internal flow path without affecting the valve core's opening and closing actions. The beneficial effect of this invention is that the valve core operates in a fully floating motion during opening and closing, and the springs have a self-cleaning function, which improves the valve's closing speed and ensures stable and reliable valve opening and closing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the overall structure of an axial flow check valve suitable for both clean and unclean media;

[0017] Figure 2 This is a schematic diagram of the valve core structure;

[0018] In the diagram: 1. Valve body; 2. Valve core; 2.1. Valve disc; 2.2. Spring; 2.3. Positioning ring; 3. Pressure ring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide an axial flow check valve suitable for both clean and unclean media, so as to solve the problems existing in the prior art, and to provide reliable opening and closing and self-cleaning under high viscosity and impurity media conditions.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1-2 As shown, the present invention provides an axial flow check valve suitable for both clean and unclean media, comprising:

[0023] Valve body 1, with a valve chamber inside; and

[0024] Valve core 2 is installed in the valve cavity of valve body 1. Valve core 2 includes a valve disc 2.1, a spring 2.2, and a positioning ring 2.3 connected in sequence. The valve disc 2.1 abuts against the opening / closing port in the valve cavity. The spring 2.2 is a double helical spring 2.2, one end of which is fixed to the valve disc 2.1, and the other end is fixedly connected to the front end of the positioning ring 2.3. The positioning ring 2.3 has a flow port.

[0025] Pressure ring 3 is installed at the end of valve body 1. Pressure ring 3 abuts against the end of positioning ring 2.3. Pressure ring 3 is used to limit the valve core 2.

[0026] In one embodiment, the valve body 1 has a valve cavity comprising a first chamber, a second chamber, and a third chamber that are sequentially connected from front to back, and the transition section between the first chamber and the second chamber is the opening and closing port of the valve cavity.

[0027] In one embodiment, the transition section between the first chamber and the second chamber adopts a necked structure, and the front end of the valve disc 2.1 is sealed and fitted at the necked position on the rear side of the transition section between the first chamber and the second chamber.

[0028] In one embodiment, the valve core 2 is located in the second chamber, and the two helices of the double helix portion of the spring 2.2 have opposite directions of rotation.

[0029] In one embodiment, the positioning ring 2.3 is provided with a circumferential flow port, the interior of the positioning ring 2.3 is a flow cavity, the flow port is connected to the flow cavity, and the end of the flow cavity is connected to the third chamber.

[0030] In one embodiment, the pressure ring 3 is located in the third chamber and abuts against the outer wall of the flow cavity of the positioning ring 2.3.

[0031] When the pressure in the upstream pipeline is greater than the opening pressure, valve core 2 compresses backward, opening the valve. When the pressure difference between the working medium and the valve reaches a certain level, the valve fully opens. The spring 2.2 on valve core 2 is designed with a large pitch. Valve core 2 is a fully floating structure without supporting bearings, so high-viscosity media containing impurities will not cause valve jamming or sticking, and will not affect the opening and closing of valve core 2. The double-helix structure of the spring 2.2 on valve core 2 provides better resilience and stability. When valve disc 2.1 senses that the pressure in the upstream pipeline is less than the opening pressure, valve core 2 moves towards the sealing direction. Spring 2.2 has good resilience, resulting in rapid and stable closure. During its movement, spring 2.2 shakes off the medium adhering to its interior and surface, achieving self-cleaning of the medium adhering to valve core 2 and spring 2.2 during valve movement, facilitating stable opening the next time.

[0032] The valve body 1 and valve core 2 form a seal, with the valve core 2 limited by the pressure ring 3. To prevent valve jamming or stuck under high-viscosity or impurity-containing media conditions and to ensure reliable and stable valve opening and closing, the spring 2.2 on the valve core 2 is designed with a large pitch, preventing impurities in the medium from getting stuck between the springs 2.2. The moving parts are a fully floating structure, eliminating the risk of sliding pair jamming or stuckness. High-viscosity or impurity-containing media can easily pass through the valve's internal flow channel without affecting the opening and closing action of the valve core 2. The spring 2.2 has high relative stiffness and a double-helix structure, providing radial stability and axial closing thrust stability. The ring-disc type is not prone to fatigue and can work effectively for a long time.

[0033] The advantages of the axial flow check valve of the present invention, applicable to both clean and unclean media, are as follows:

[0034] 1. The valve core 2 opens and closes with a fully floating motion, eliminating the risk of sliding pair jamming or stuck.

[0035] 2. Spring 2.2 has a self-cleaning function, which can not only improve the valve closing speed, but also ensure the valve opening and closing is stable and reliable.

[0036] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An axial flow check valve suitable for both clean and unclean media, characterized in that: include Valve body, wherein a valve cavity is formed within the valve body; and A valve core, installed in the valve cavity of the valve body, comprises a valve disc, a spring, and a positioning ring connected in sequence. The valve disc abuts against the opening / closing port in the valve cavity. The spring is a double helical spring, one end of which is fixed to the valve disc, and the other end is fixedly connected to the front end of the positioning ring. The spring pitch on the valve core is designed to be greater than 3 times the wire diameter under extreme compression (fully open). The positioning ring has a flow port. A pressure ring is fitted to the end of the valve body, and the pressure ring abuts against the end of the positioning ring. The pressure ring is used to limit the valve core. The valve cavity of the valve body includes a first chamber, a second chamber, and a third chamber arranged sequentially from front to back. The transition section between the first chamber and the second chamber is the opening and closing port of the valve cavity. The positioning ring is provided with a circumferential flow port. The interior of the positioning ring is a flow cavity. The flow port communicates with the flow cavity. The end of the flow cavity communicates with the third chamber.

2. The axial flow check valve applicable to both clean and unclean media according to claim 1, characterized in that: The transition section between the first chamber and the second chamber adopts a necked structure, and the front end of the valve disc is sealed and fitted at the necked position on the rear side of the transition section between the first chamber and the second chamber.

3. The axial flow check valve applicable to both clean and unclean media according to claim 1, characterized in that: The valve core is located in the second chamber, and the two helices of the double helix portion of the spring have opposite directions of rotation.

4. The axial flow check valve applicable to both clean and unclean media according to claim 1, characterized in that: The pressure ring is located in the third chamber, and the pressure ring abuts against the outer wall of the flow cavity of the positioning ring.

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