One-way valve

Abstract

The utility model provides a one-way valve which comprises a base, the base is provided with an integrally-formed rotation stopping structure, a valve element is provided with a plurality of side planes extending in the axial direction of a valve body pipe, and the side planes are adjacently arranged in the circumferential direction of the valve element. The rotation stopping structure comprises a plurality of rotation stopping rods which are in corresponding contact with the side planes respectively and have preset widths, and the rotation stopping rods are arranged at intervals around a central overflowing hole formed in the base; the rotation stopping rod comprises an axial limiting part, the axial limiting part is used for limiting the axial moving position of the valve element, and the rotation stopping structure can prevent the valve element from rotating and can also prevent the base from shielding the back face of the valve element to hinder medium flowing. The base with the rotation stopping structure and the axial limiting part is integrally formed, the structure is simple, the production process is simple, and the production cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid flow direction switching valve design, in particular to a one-way valve. Background Art

[0002] One-way valves are widely used in air-conditioning heat pump systems to limit the flow direction of refrigerant fluid in one direction. The principle of its implementation is to change the relative position of the valve core and the valve port of the valve seat under the action of the pressure difference at both ends of the valve core. For example, when the pressure at one end of the valve core is greater than the pressure at the other end, the valve core contacts the valve port to achieve the cutoff of the fluid there. When the pressure at one end of the valve core is less than the pressure at the other end, the valve core and the valve port are disengaged and a flow is formed between the two, thereby achieving the circulation of the fluid there. Our company's application 2024200617797 discloses a one-way valve, in which a base fixedly connected to the valve body tube is also provided in the valve body tube, and the base has a stop rod, and two stop rods arranged opposite to each other are formed with assembly holes, and the limiter is rod-shaped, and the two ends of the limiter are assembled in the assembly hole. However, the limiter is a separate part and needs to be installed on the stop rod, and the structure and process are relatively complicated. Summary of the invention

[0003] The one-way valve designed in the present invention can at least partially solve the above problems.

[0004] The utility model aims to provide a one-way valve, a one-way valve, comprising a valve body tube, in which a valve seat and a valve core are sequentially arranged at intervals along the axial extension direction of the valve body tube, wherein the positions of the valve seat and the valve body tube are relatively fixed, the valve seat has a valve port which passes through along its axial direction, and the valve core can be slidably assembled in the valve body tube along the axial direction to have a positive connection position which conducts the valve port and a reverse cut-off position which cuts off the valve port; the valve body tube is also provided with a base fixedly connected to the valve body tube, and the base has an integrally formed stop Rotation structure, the anti-rotation structure cooperates with the valve core to prevent the valve core from rotating around the central axis of the valve body tube; the valve core has a plurality of side planes extending along the axial direction of the valve body tube, each of the side planes is adjacently arranged around the circumferential direction of the valve core, the anti-rotation structure includes a plurality of anti-rotation rods with a predetermined width respectively contacting with each of the side planes, each of the anti-rotation rods is spaced around the central flow hole of the base; the anti-rotation rod includes an axial limiting portion, and the axial limiting portion limits the axial movement position of the valve core.

[0005] Wherein, the axial limiting portion is in the shape of a step, and the step is formed by the stop rod portion protruding toward the center line direction of the base.

[0006] Furthermore, it also includes a spring, which is located between the valve core and the axial limiting portion, and when the valve core is in the reverse cut-off position, the spring is in a free state.

[0007] Furthermore, a blind hole is formed on an end surface of the valve core away from the valve seat, and the first end of the spring is located in the blind hole.

[0008] Furthermore, the diameter of the spring increases from the first end to the second end of the spring.

[0009] Further, the axial limiting portion supports the spring.

[0010] Optionally, the valve core has two, three or four side planes, and there is at least one corresponding stop rod, and the side surface of the stop rod facing the valve core is also a plane.

[0011] Furthermore, the valve core includes an arc surface, and the arc surface is slidably matched with the inner wall of the valve body tube.

[0012] Furthermore, the side plane of the valve core is slidably matched with the side plane of the anti-rotation rod.

[0013] Furthermore, the axial height of the axial limiting portion is adapted to the axial flow gap.

[0014] The one-way valve of the utility model has an integrally formed anti-rotation structure in the base, and the valve core has a plurality of side planes extending along the axial direction of the valve body tube, and each of the side planes is adjacently arranged around the circumferential direction of the valve core, and the anti-rotation structure includes a plurality of anti-rotation rods with a predetermined width respectively contacting with each of the side planes, and each of the anti-rotation rods is arranged at intervals around the central flow hole of the base; the anti-rotation rod includes an axial limit portion, and the axial limit portion is the axial movement position of the valve core, and the anti-rotation structure can prevent the valve core from rotating and prevent the base from blocking the back of the valve core and hindering the flow of the medium. The base with the anti-rotation structure and the axial limit portion is formed by integral molding, and the structure is simple, the production process is simple, and the production cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of a one-way valve according to an embodiment of the utility model.

[0016] Figure 2 yes Figure 1 Schematic diagram of CC cross-section connection structure.

[0017] Figure 3 It is a structural schematic diagram of another valve core and valve body tube matching implementation method.

[0018] Figure 4 yes Figure 1 Three-dimensional structural diagram of the middle valve core.

[0019] Figure 5 yes Figure 4 Front view of the middle valve core (axial projection).

[0020] Figure 6 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle base.

[0021] In the figure: 1, valve body tube; 21, valve seat; 211, valve port; 22, valve core; 220, axial flow clearance; 221, blind hole; 222, arc surface; 3, spring; 4, base; 41, stop rod; 411, axial limit portion; 42, center flow hole. DETAILED DESCRIPTION

[0022] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers are exaggerated for clarity. The same reference numerals in the drawings represent the same or similar structures, and thus their detailed description will be omitted.

[0023] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be used. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present invention.

[0024] The embodiments described in the following examples are only some embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. All other embodiments obtained by ordinary technicians in this field without creative work should be included in the protection scope of the present utility model.

[0025] Please refer to Figures 1 to 6According to an embodiment of the utility model, a one-way valve is provided, comprising a valve body tube 1, wherein a valve seat 21 and a valve core 22 are sequentially arranged in the valve body tube 1 along its axial extension direction, wherein the positions of the valve seat 21 and the valve body tube 1 are relatively fixed, and the aforementioned relative fixation can specifically be directly or indirectly fixedly connected to the inner wall of the valve body tube 1, and the valve seat 21 has a valve port 211 extending through the axial direction thereof, and the valve core 22 can be slidably assembled in the valve body tube 1 along the axial direction to have a forward communication position for conducting the valve port 211 and a reverse cut-off position for cutting off the valve port 211, so that the valve core 22 can be switched between the forward communication position and the reverse cut-off position under the pressure difference at both ends of the valve core 22. The base has an integrally formed anti-rotation structure made of aluminum or other materials by die-casting (or casting or powder metallurgy), and the anti-rotation structure cooperates with the valve core to prevent the valve core 22 from rotating around the central axis of the valve body tube 1; the valve core 22 has a plurality of side planes extending along the axial direction of the valve body tube 1, and each of the side planes is adjacently arranged around the circumferential direction of the valve core 22, and the anti-rotation structure includes a plurality of anti-rotation rods 41 with a predetermined width respectively contacting each of the side planes, and each of the anti-rotation rods 41 is arranged at intervals around the central flow hole 42 of the base 4. It can be understood that the gap formed between two adjacent anti-rotation rods 41 forms a fluid flow gap with the central flow hole 42; the anti-rotation rod 41 includes an axial limiting portion 411, and the axial limiting portion 411 limits the axial movement position of the valve core 22. The axial limiting portion 411 is in a step shape, and the step is formed by the anti-rotation rod 41 part protruding toward the center line direction of the base 4. The predetermined width of the anti-rotation rod 41 should ensure a reasonable flow resistance of the medium, and the width should be as small as possible. The axial limit portion 411 is stepped, and the anti-rotation structure can prevent the valve core from rotating and prevent the base from blocking the back of the valve core and hindering the flow of the medium. The base with the anti-rotation structure and the axial limit portion is formed by integral molding, which has a simple structure and a simple production process, and greatly reduces the production cost.

[0026] Among them, the cross section of the valve core 22 is a square, and the axial flow clearance 220 is the gap between the side plane and the inner wall of the valve body tube 1. There are four corresponding stop rods 41, and the side of the stop rod 41 facing the valve core 22 is also a plane, and the side plane of the valve core 22 slides with the side plane of the stop rod 41. The axial height of the axial limit portion 411 is adapted to the axial flow clearance 220, and the axial height of the axial limit portion is sufficient to ensure that the flow of the medium is not hindered, and the optimal flow area is not less than the area of ​​the axial flow clearance. In some embodiments, the side planes of the valve core 22 can also have two or three. The size of the gap between the side plane of the valve core 22 and the side plane of the stop rod 41 directly determines the angle at which the valve core can rotate. The smaller the gap, the smaller the angle at which the valve core can rotate. A reasonable gap can be set according to system requirements. Compared with the valve core with three wing plates evenly spaced around the axis of the valve body tube, although the flow resistance of this solution is larger, the angle at which the valve core can rotate is small and the noise is very small. In some embodiments, the valve core 22 includes an arc surface 222 , and the arc surface 222 is slidably matched with the inner wall of the valve body tube 1 .

[0027] This technical solution also includes a spring 3, which is located between the valve core 22 and the axial limit portion 411, and of course also in the valve body tube 1, and when the valve core 22 is in the reverse cut-off position, the spring 3 is in a free state, that is, when the valve core 22 is in the reverse cut-off position, the spring 3 is in a non-compressed state.

[0028] In this technical solution, an elastic spring 3 is arranged between the axial limiting portion 411 and the valve core 22. When the valve core 22 is switched on and off under the action of a low pressure difference at its two ends, the displacement of the end of the valve core 22 away from the valve port 211 will be limited by the spring 3. On the one hand, the elastic force of the spring 3 can be used to reduce the axial displacement of the valve core 22, thereby reducing the friction noise between the valve core 22 and the contact parts on its moving path. On the other hand, the elastic action of the spring 3 can be used to buffer the axial movement of the valve core 22, thereby reducing the abnormal noise generated by the movement of the valve core 22 under low pressure difference conditions.

[0029] In some embodiments, the mass of the spring 3 is not greater than three times the mass of the valve core 22, so that the noise reduction effect of the spring 3 can be achieved while ensuring the smooth switching of the position of the valve core 22; in another preferred embodiment, when the spring 3 is in the free state, the axial clearance between the valve core 22 and the valve port 211 is not greater than 1 mm, that is, when the valve core 22 moves more than 1 mm away from the valve port 211, the valve core 22 will contact the spring 3 and compress the spring 3. Such a setting can, on the one hand, enable the valve core 22 to move within a smaller range, and on the other hand, ensure the smooth opening of the valve core 22 under low pressure difference conditions.

[0030] A blind hole 221 is formed on an end surface of the valve core 22 away from the valve seat 21 , and the first end of the spring 3 is located in the blind hole 221 , so that the spring 3 can guide the movement of the valve core 22 , ensuring smooth and stable position switching of the valve core 22 .

[0031] The diameter of the spring 3 increases from the first end to the second end of the spring 3, that is, the spring 3 is a variable diameter spring. At this time, the first end can be called a small diameter end and the second end can be called a large diameter end. In this technical solution, the second end corresponding to the axial limiting portion 411 is designed to have a larger diameter. The axial limiting portion 411 supports the spring 3, so that the state of the spring 3 when compressed is more stable.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A one-way valve, comprising a valve body tube (1), wherein a valve seat (21) and a valve core (22) are arranged in sequence along the axial extension direction of the valve body tube (1), wherein the positions of the valve seat (21) and the valve body tube (1) are relatively fixed, the valve seat (21) has a valve port (211) extending along the axial direction thereof, and the valve core (22) can be slidably assembled in the valve body tube (1) along the axial direction to have a forward connection position for conducting the valve port (211) and a reverse cut-off position for cutting off the valve port (211); the valve body tube (1) is also provided with a base (21) fixedly connected to the valve body tube (1) 4), the base (4) has an integrally formed anti-rotation structure, the anti-rotation structure cooperates with the valve core (22) to prevent the valve core (22) from rotating around the central axis of the valve body tube (1); the valve core (22) has a plurality of side planes extending along the axial direction of the valve body tube (1), each of the side planes is adjacently arranged in the circumferential direction around the valve core (22), the anti-rotation structure includes a plurality of anti-rotation rods (41) with a predetermined width respectively contacting each of the side planes, each of the anti-rotation rods (41) is arranged at intervals around the central flow hole (42) of the base (4); characterized in that, The anti-rotation rod (41) comprises an axial limiting portion (411), and the axial limiting portion (411) limits the axial movement position of the valve core (22).

2. The one-way valve according to claim 1, characterized in that: The axial limiting portion (411) is in the shape of a step, and the step is formed by the portion of the anti-rotation rod (41) protruding in the direction of the center line of the base (4).

3. The one-way valve according to claim 1, characterized in that: It also includes a spring (3), which is located between the valve core and the axial limiting portion (411), and is in a free state when the valve core is in the reverse cut-off position.

4. The one-way valve according to claim 3, characterized in that: A blind hole (221) is formed on an end surface of the valve core (22) away from the valve seat (21), and the first end of the spring (3) is located in the blind hole (221).

5. The one-way valve according to claim 4, characterized in that: The diameter of the spring (3) increases gradually from the first end toward the second end of the spring (3).

6. The one-way valve according to claim 3, 4 or 5, characterized in that: The axial limiting portion (411) supports the spring (3).

7. The one-way valve according to claim 1, characterized in that: The valve core (22) has two, three or four side planes, and there is at least one corresponding stop rod (41), and the side surface of the stop rod (41) facing the valve core (22) is also a plane.

8. The one-way valve according to claim 1, characterized in that: The valve core (22) comprises an arc surface (222), and the arc surface (222) is slidably matched with the inner wall of the valve body tube (1).

9. The one-way valve according to claim 7, characterized in that: The side plane of the valve core (22) is slidably matched with the side plane of the anti-rotation rod (41).

10. The one-way valve according to claim 2, characterized in that: The axial height of the axial limiting portion (411) is adapted to the axial flow gap (220).

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