A check valve

Abstract

The present invention discloses a check valve, belonging to the technical field of check valves, including: a valve body, a valve core, an anti-rotation mechanism, and a valve cover. The valve body includes a valve cavity, and a wing plate is provided on the valve core. It is characterized in that: the valve body and the valve cover are fixedly connected by welding, and the anti-rotation mechanism is fixedly installed by the cooperation of the valve body and the valve cover; the anti-rotation mechanism includes a mating part and an anti-rotation part. The mating part cooperates with the valve body and the valve cover to fix the anti-rotation mechanism, so that the anti-rotation mechanism does not loosen in the check valve. The anti-rotation part extends into the interior of the valve body and is located between the valve cavity and the wing plate of the valve core for restricting the axial rotation of the valve core; the anti-rotation mechanism is formed by processing a round metal rod or a strip-shaped metal sheet. A part of the round metal rod or the strip-shaped metal sheet is formed into a mating part with the valve body and the valve cover through winding and bending, and the other part is formed into a straight strip shape through bending to form the anti-rotation part. The present invention alleviates the problems of complex processing, high production cost, and easy failure in the prior art.

Description

Technical Field

[0001] The present invention relates to a check valve, belonging to the technical field of check valves. Background Art

[0002] A check valve is a valve that allows fluid to flow in only one direction while inhibiting reverse flow. Such a check valve is provided in a hydraulic circuit or a pipe of a refrigeration cycle system to prevent reverse flow of the fluid. This check valve includes a valve core inserted into the valve body. When the refrigerant flows reversely, the valve core blocks the passage to prevent the reverse flow of the refrigerant. Since most compressors in current air conditioner systems are scroll type, the discharged refrigerant will have surging. Due to the influence of production and installation perpendicularity, the valve core of the check valve cannot achieve complete dynamic balance inside the valve body. Under the impact of the surging refrigerant of the compressor, the valve core of the check valve often rotates and rubs against the inner wall of the valve cavity, generating abnormal noise. Since this noise has a low frequency and is a regular sound, it has a high recognition degree by the human ear, which easily causes the user to be irritable and endangers the health of the user.

[0003] In the Chinese utility model patent application with the publication number CN205064939, a check valve is disclosed. By providing a limiting portion on the valve cover, the limiting portion circumferentially limits the rotation of the valve core during the process of the valve core opening the valve port, so that the rotation range of the valve core is restricted, thereby reducing the frictional impact between the valve core and the inner wall of the valve cavity, and thus reducing the working noise. The technical solution of this patent proposes that the limiting portion and the valve cover are integrally formed, but the processing is complex and the production cost is relatively high; this patent also proposes that the limiting portion and the valve cover are fixed in an assembled manner. In the case of long-term use, the limiting portion is likely to loosen and fall off from the valve cover, which will cause the failure of the product. Therefore, it is urgent to adopt a new technical method to make up for the deficiencies of the existing technology. Summary of the Invention

[0004] In order to alleviate the deficiencies of the existing technology, the present invention provides a check valve.

[0005] A check valve includes a valve body, a valve core, an anti-rotation mechanism, and a valve cover. The valve body includes a valve cavity. A wing plate is provided on the valve core. It is characterized in that: the valve body and the valve cover are fixedly connected by welding, and the anti-rotation mechanism is fixedly installed through the cooperation of the valve body and the valve cover; the anti-rotation mechanism includes a mating portion and an anti-rotation portion. The mating portion cooperates with the valve body and the valve cover to fix the anti-rotation mechanism, so that the anti-rotation mechanism does not loosen inside the check valve. The anti-rotation portion extends into the valve body and is located between the valve cavity and the wing plate of the valve core for restricting the axial rotation of the valve core; the anti-rotation mechanism is formed by processing a circular metal rod or a strip-shaped metal sheet. A part of the circular metal rod or the strip-shaped metal sheet forms the mating portion with the valve body and the valve cover through winding and bending, and the other part forms a straight strip shape through bending to form the anti-rotation portion.

[0006] Further, a part of the circular metal rod or strip-shaped metal sheet is formed into a fitting part by being wound into an arc shape and positioned by the step of the valve body, and the remaining part is formed into a straight strip shape by bending to form a rotation prevention part.

[0007] Further, the rotation prevention mechanism is formed into a fitting part and a rotation prevention part by bending. A groove matching the fitting part of the rotation prevention mechanism is provided on the valve cover. After the fitting part is assembled with the groove of the valve cover, it is then assembled with the valve body, and the valve cover, the rotation prevention mechanism, and the valve body are connected and fixed by welding.

[0008] Further, the fitting part of the rotation prevention mechanism extends towards the center or the inside of the arc formed by the fitting part at a position close to the rotation prevention part, so that the rotation prevention part is located in the valve cavity and between the valve core wing plates after assembly.

[0009] Further, the one-way valve further includes an input pipe and an output pipe. The input pipe is connected to the valve body, and the output pipe is connected to the valve cover.

[0010] Further, the rotation prevention part of the rotation prevention mechanism closely adheres to the inner wall of the valve cavity.

[0011] Further, the end of the rotation prevention part of the rotation prevention mechanism has a smooth transition to prevent shearing of the valve core.

[0012] Further, the end of the rotation prevention part of the rotation prevention mechanism is bent and closely adheres to the inner wall of the valve cavity, and the remaining part has a gap with the inner wall of the valve cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 is an exploded schematic diagram of Embodiment 1 of the present invention;

[0015] Figure 2 is a three-dimensional view of the rotation prevention mechanism in Embodiment 1 of the present invention;

[0016] Figure 3 is a three-dimensional view of the rotation prevention mechanism in Embodiment 2 of the present invention;

[0017] Figure 4 is a three-dimensional view of the valve cover in Embodiment 2 of the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of the present invention.

[0019] Embodiment 1:

[0020] Figure 1 is a disassembled schematic diagram of Embodiment 1 of the present invention. As Figure 1 and Figure 2 shown, the one-way valve includes a valve body 1, a valve core 2, an anti-rotation mechanism 3, a valve cover 4, an input pipe 5, and an output pipe 6. The valve core 2 is a conical core body. The valve core 2 is installed in the valve cavity 11 of the valve body 1. The sealing surface 21 of the valve core 2 abuts against one end face of the valve body 1 during assembly. The outer side surface of the wing plate 22 is parallel to the inner wall of the valve body 1. The anti-rotation mechanism 3 is composed of a mating part 31 and an anti-rotation part 32. The mating part 31 cooperates with the valve body 1 and the valve cover 4 to fix the anti-rotation mechanism and prevent it from loosening inside the one-way valve. The anti-rotation part 32 extends into the valve body 1 and is located between the valve cavity 11 and the wing plate 22 of the valve core, and is used to limit the axial rotation of the valve core 2. Specifically, the mating part 31 is installed on the step 12 of the valve body 1, and the valve cover 4 is installed on the mating part 31. The valve cover 4 is fixedly connected to the valve body 1 by welding. The stress generated by the welding connection of the valve cover 4 presses the mating part 31, so that the mating part 31 is fixed between the step 12 and the valve cover 4, so as to achieve the purpose that the anti-rotation part 32 does not loosen in the valve cavity 11. The input pipe 5 is connected to the valve body 1 by welding, and the output pipe 6 is connected to the valve cover 4 by welding.

[0021] As Figure 2As shown, in an alternative embodiment, the anti-rotation mechanism 3 is made by processing a round metal bar. A part of the round metal bar is formed into a mating portion 31 by being wound into an arc shape, and the remaining part is formed into a straight strip by bending to form an anti-rotation portion 32. Specifically, the winding process is divided into two types: cold coiling method and hot coiling method. For a round metal bar with a cross-sectional diameter less than or equal to 8 mm, the cold coiling method is adopted. Generally, no quenching treatment is carried out after coiling, and only low-temperature tempering is required to eliminate the internal stress during coiling. For a round metal bar with a cross-sectional diameter greater than 8 mm, the hot coiling method is adopted, and after coiling in the hot state, quenching, medium-temperature tempering and other treatments must be carried out. After the round metal bar is wound to form the arc-shaped mating portion 31, it should be noted that when the mating portion 31 is processed, it needs to extend towards the center of the circle or the inside of the arc formed by the mating portion 31 at a position close to the anti-rotation portion 32, so that the anti-rotation portion 32 is located inside the valve cavity 11 and between the valve core wing plates 22 after assembly. Due to the existence of the step 12, if the mating portion 31 does not extend towards the center of the circle or the inside of the arc formed by the mating portion 31 during processing, or the extended dimension is too small, the anti-rotation portion 32 will be blocked outside the valve cavity 11 by the step 12. The anti-rotation portion 32 is formed by bending the remaining part of the round metal bar into a straight strip, thus completing the processing of the anti-rotation mechanism 3.

[0022] In another alternative embodiment, the anti-rotation mechanism 3 is made by processing a strip-shaped metal sheet. A part of the strip-shaped metal sheet is formed into a mating portion 31 by being wound into an arc shape, and the remaining part is formed into a straight strip by bending to form an anti-rotation portion 32. Different from the round metal bar, when selecting the winding process, the cross-section of the strip-shaped metal sheet is equivalently calculated using the nominal diameter.

[0023] It should be noted that in order to facilitate the control of dimensions, the anti-rotation portion 31 of the anti-rotation mechanism is closely attached to the inner wall of the valve cavity 11. Optionally, the end of the anti-rotation portion 31 is bent and closely attached to the inner wall of the valve cavity 11, and the remaining part has a gap with the inner wall of the valve cavity 11.

[0024] In addition, if there are sharp corners on the outer shape of the end of the anti-rotation portion 31, a smooth transition treatment is required to avoid stress concentration at the sharp corners and shearing the valve core during use.

[0025] The check valve of this embodiment is generally used in air conditioners. When installed, the check valve is placed vertically, with the input pipe 5 at the bottom, the output pipe 6 at the top, and the valve core 2 abutted against one end face of the valve body 1 under the action of gravity, and the check valve is in a closed state. When the liquid refrigerant enters the input pipe 5, when the pressure exerted by the refrigerant on the valve core 2 is greater than the gravity of the valve core 2, the valve core 2 moves axially, so that the check valve is in an open state. Since most compressors are scroll type, the discharged refrigerant will surge. When the refrigerant enters the valve cavity 11, the valve core 2 will rotate under the vortex of the liquid refrigerant. Since there are anti-rotation parts 32 between the wing plates 22, the rotation range of the valve core 2 will be limited within the angle formed by two adjacent wing plates 22, so as to reduce the frictional impact between the wing plates 22 and the inner wall of the valve body 1, and further reduce the noise generated by the frictional impact.

[0026] Embodiment 2:

[0027] The difference from Embodiment 1 is that as Figure 3 and Figure 4 shown, the anti-rotation mechanism 3 is formed by bending a strip-shaped metal plate into a mating part 31 and an anti-rotation part 32, and a groove 41 matching the mating part 31 of the anti-rotation mechanism is provided on the valve cover 4. It should be noted that after the mating part 31 and the groove 41 of the valve cover are assembled, it cannot be guaranteed that they will not become loose, and it needs to be fixed by the cooperation of the valve cover 4 and the valve body 1. During assembly, one end of the mating part 31 abuts into the groove 41, and the other end of the mating part fits against the valve body step 12. Under the cooperation of the groove 41 and the step 12, the mating part 31 of the anti-rotation mechanism is fixed between the valve cover 4 and the valve body 1. The anti-rotation part 32 extends into the valve body 1 and is located between the valve cavity 11 and the valve core wing plates 22 to limit the axial movement of the valve core 2. After assembly, the valve cover 4, the anti-rotation mechanism 3 and the valve body 1 are connected and fixed by welding. Under the action of the welding stress, the three are tightly fixed, so as to achieve the purpose that the anti-rotation part 32 does not become loose in the valve cavity 11. In an alternative embodiment, brazing is used for the welding operation, and the specific process is as follows: Place the brazing filler metal near the contact positions of the workpieces after assembly. When the workpieces and the brazing filler metal are heated to slightly higher than the melting point temperature of the brazing filler metal, the brazing filler metal melts and is sucked into and fills the gap between the solid workpieces by capillary action. The liquid brazing filler metal diffuses and dissolves with the workpiece metal, and a welded joint is formed after condensation.

[0028] The beneficial effects of the present invention are that the processing method is simple and easy to use, and the cost is also low. The anti-rotation mechanism is fixed by the cooperation of the valve cover and the valve body, which can effectively avoid the loosening of the anti-rotation mechanism in the valve body, ensure the effective anti-rotation of the valve core, and further effectively solve the noise problem in the operation of the check valve.

[0029] The parts not elaborated in detail in the present invention belong to the content of the well-known technology in the field.

Claims

1. A one-way valve, comprising a valve body, a valve core, an anti-rotation mechanism, and a valve cover. The valve body includes a valve cavity, and the valve core is provided with wing plates, characterized in that: The valve body and the valve cover are fixedly connected by welding, and the anti-rotation mechanism is fixed by the cooperation of the valve body and the valve cover; the anti-rotation mechanism includes a mating portion and an anti-rotation portion, the mating portion cooperates with the valve body and the valve cover, wherein the mating portion is installed on the step of the valve body, and the valve cover is installed on the mating portion to fix the anti-rotation mechanism so that the anti-rotation mechanism does not loosen in the one-way valve, and the anti-rotation portion extends into the interior of the valve body and is located between the valve cavity and the valve core wing plate for restricting the circumferential rotation of the valve core; The anti-rotation mechanism is formed by bending to form a mating portion and an anti-rotation portion, and a groove matching the mating portion of the anti-rotation mechanism is provided on the valve cover. After the mating portion is assembled with the groove of the valve cover, it is then assembled with the valve body, and the valve cover, the anti-rotation mechanism and the valve body are fixedly connected by welding; The anti-rotation portion of the anti-rotation mechanism is closely attached to the inner wall of the valve cavity.

2. The check valve according to claim 1, characterized in that, The one-way valve further includes an input pipe and an output pipe, the input pipe is connected to the valve body, and the output pipe is connected to the valve cover.

3. The check valve according to claim 1, characterized in that, The end of the anti-rotation portion of the anti-rotation mechanism has a smooth transition to prevent shearing of the valve core.

4. The one-way valve according to claim 1, characterized in that, The end of the anti-rotation portion of the anti-rotation mechanism is bent and closely attached to the inner wall of the valve cavity, and the rest has a gap with the inner wall of the valve cavity.

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