Piston check valve and carbon dioxide refrigeration apparatus

Abstract

The utility model relates to a piston type check valve and carbon dioxide refrigeration equipment. It solves the technical problem of unreasonable design of the existing piston valve. The piston type check valve includes: the connecting pipe body includes the male pipe and the female pipe connected axially and the valve cavity communicated between the male pipe and the female pipe, the female pipe is sleeved on the circumferential outside of one end of the male pipe and is connected with the male pipe in screw, the inner wall of one end of the female pipe is equipped with the installation step that can be axially contacted with the male pipe end, the outer wall of one end of the male pipe is equipped with the welding step that can be axially contacted with the female pipe end, and the recessed annular welding groove is formed in the welding step position, the valve core subassembly includes the flow guide plate set up on the installation step and communicated two side valve cavities, the valve core shaft is axially set up in one end of the flow guide plate along the connecting pipe body, and the valve head is sleeved in the outside of the valve core shaft. The piston type check valve reduces the process difficulty, improves the sealing strength and the aesthetic degree simultaneously.

Description

Technical Field

[0001] This utility model belongs to the field of piston check valves, and relates to a piston-type check valve and a carbon dioxide refrigeration device. Background Technology

[0002] For example, Chinese patent literature discloses a piston valve core structure with a guide rod in a one-way valve [201820408770.3], which includes: a valve body having a forward inlet, an intermediate valve chamber and a reverse inlet; a piston with a guide rod located inside the intermediate valve chamber, the piston having a piston portion and a guide rod portion; a flow guide hole base located inside the intermediate valve chamber, the flow guide hole base having a central guide hole and a peripheral flow guide hole formed thereon, the central guide hole being used to mate with the guide rod portion; and a return spring for providing a force to the piston portion in the direction of the forward inlet.

[0003] The drawback of the above technical solution is that the structural strength of the valve cavity using this structure is poor, and the surface of the pipe is uneven, which is not conducive to welding and sealing, resulting in poor sealing strength of the overall valve body. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a piston-type check valve and a carbon dioxide refrigeration device.

[0005] The objective of this utility model can be achieved through the following technical solutions: The piston-type check valve includes: The connecting pipe body includes an axially connected male pipe and female pipe, and a valve cavity communicating between the male pipe and female pipe. The female pipe is sleeved on the circumferential outer side of one end of the male pipe and is threadedly connected to the male pipe. The inner wall of one end of the female pipe is provided with an installation step that can be spaced apart from the end of the male pipe. The outer wall of one end of the male pipe is provided with a welding step that allows the end of the female pipe to be axially connected, and a recessed annular welding groove is formed at the welding step position. The valve core assembly includes a guide plate disposed on the mounting step and communicating with the two valve chambers, a valve core shaft disposed axially along the connecting pipe body at one end of the guide plate, a valve head sleeved on the outside of the valve core shaft, and an elastic element disposed between the valve core shaft and the valve head, which forces the valve head to move toward one end of the valve chamber and can close one end of the valve chamber.

[0006] Furthermore, the male tube has an annular shoulder at one end near the annular welding groove, and the female tube has an annular notch at one end near the annular welding groove. The annular shoulder and the annular notch are spaced apart to form the aforementioned annular welding groove.

[0007] Furthermore, the valve cavity is provided with a shrinkage orifice at one end near the main tube, and the circumferential edge of the shrinkage orifice is provided with an annular edge protruding toward one end of the valve cavity.

[0008] Furthermore, the valve head has a T-shaped cross-section, and the outer diameter of the valve head near the annular side is larger than the outer diameter of the valve head away from the annular side.

[0009] Furthermore, the end of the valve head near the annular edge is flat and its circumferential edge is larger than the circumferential edge of the annular edge.

[0010] Furthermore, a mounting protrusion is provided at the middle of one end of the valve head, and a sealing gasket that can engage with the annular edge is sleeved on the mounting protrusion.

[0011] Furthermore, the valve cavity near the male pipe has a tapered section whose inner diameter gradually decreases towards the male pipe.

[0012] This utility model also provides a carbon dioxide refrigeration device having a piston-type one-way valve as described above.

[0013] Compared with existing technologies, the connecting pipe of this piston-type check valve adopts a threaded connection and welding method with the outer wall pipe, which facilitates the initial placement and positioning of the valve core assembly, reduces process difficulty, increases the structural strength of the connecting pipe, improves sealing strength, and the welded surface is smooth, improving aesthetics. Attached Figure Description

[0014] Figure 1 A schematic diagram of a piston-type check valve provided by this utility model.

[0015] Figure 2 for Figure 1 A schematic diagram of the valve core assembly of a piston-type check valve.

[0016] Figure 3 for Figure 1 A schematic diagram showing the external mounting of the elastic element in a piston-type check valve.

[0017] In the diagram, 10 is the connecting pipe body; 11 is the male pipe; 12 is the female pipe; 13 is the external thread; 14 is the internal thread hole; 15 is the mounting step; 16 is the welding step; 17 is the annular welding groove; 18 is the annular shoulder; 19 is the annular notch; 20 is the valve cavity; 21 is the shrinkage cavity; 22 is the annular edge; 23 is the tapered section; 30 is the valve core assembly; 31 is the guide plate; 32 is the valve core shaft; 33 is the valve head; 34 is the elastic element; 35 is the mounting protrusion; and 36 is the sealing gasket. Detailed Implementation

[0018] Example 1, please refer to Figures 1 to 3This diagram illustrates a piston-type check valve and a carbon dioxide refrigeration device provided by this utility model. The piston-type check valve includes: a connecting pipe body 10, a valve chamber 20 disposed in the connecting pipe body 10, and a valve core assembly 30 disposed in the valve chamber 20. It is conceivable that this piston-type check valve also includes other functional components and specific structures, such as sealing components and installation structures, all of which are well-known to those skilled in the art and will not be described in detail here.

[0019] In this embodiment, the connecting pipe body 10 includes an axially connected male pipe 11 and female pipe 12. One end of the female pipe 12 is provided with an internal threaded hole 14, and one end of the male pipe 11 is provided with an external thread 13. The female pipe 12 is sleeved on the circumferential outer side of one end of the male pipe 11, and a threaded connection is formed by the cooperation of the internal threaded hole 14 and the external thread 13. A valve cavity 20 is formed at the junction of the male pipe 11 and the female pipe 12. The detachable nature of the threaded connection facilitates the insertion and positioning of the valve core assembly 30 in the early stage. The inner diameter of the valve cavity 20 is larger than the inner diameter of the male pipe 11 or the female pipe 12, which provides more installation space, facilitates the installation of the valve core assembly 30, and is also used for flow velocity compensation of the pipeline assembly.

[0020] The inner wall of one end of the female pipe 12 is provided with an installation step 15 that is spaced apart from the end of the male pipe 11, reserving space for the installation of the valve core assembly 30, improving the flatness of the internal connection of the valve cavity 20, and ensuring that the flow velocity inside the valve cavity 20 is not affected. At the same time, the outer wall of one end of the male pipe 11 is provided with a welding step 16 that allows the end of the female pipe 12 to be axially connected, improving the flatness of the external connection of the connecting pipe body 10. The axial connection and locking of the male pipe 11 and the female pipe 12 are achieved through the cooperation of the installation step 15 and the welding step 16, improving the connection strength of the connection end. A recessed annular welding groove 17 is formed at the welding step 16. The annular welding groove 17 reserves space to facilitate welding and sealing of the external circumferential connection gap. After welding, the sealing strength of the connecting pipe body 10 is enhanced, and the welded connection can be re-ground to form the flatness of the outer surface of the connecting pipe body 10.

[0021] Specifically, due to the sleeve connection method of the connecting pipe body 10, the outer diameter of the female pipe 12 at the connection point of the annular welding groove 17 is larger than the outer diameter of the male pipe 11 at the connection point of the annular welding groove 17. The male pipe 11 is provided with an annular shoulder 18 at one end near the annular welding groove 17, and the female pipe 12 is provided with an annular notch 19 at one end near the annular welding groove 17. The annular shoulder 18 and the annular notch 19 are spaced apart to form the aforementioned annular welding groove 17. The difference in outer diameter between the male pipe 11 and the female pipe 12 is eliminated by the annular shoulder 18 and the annular notch 19. The annular welding groove 17 is filled by welding filler. It can be imagined that the installation step 15 and the welding step 16 are staggered inside and outside. When welding is performed at the position of the annular welding groove 17, the resulting structural deformation will not affect the installation structure of the valve core assembly 30 in the valve cavity 20.

[0022] In this embodiment, the valve core assembly 30 includes a guide plate 31 disposed on the mounting step 15 and communicating with the valve chambers 20 on both sides. The two ends of the guide plate 31 overlap the mounting step 15, and the other end is screwed into the threaded hole 14 of the female pipe 12 via a male pipe 11. The male pipe 11 abuts against the guide plate 31, forming a fixed installation on the guide plate 31. The outer walls on both sides of the guide plate 31 have clearance space with the inner wall of the valve chamber 20, which does not affect the communication between the valve chambers 20 on both sides of the guide plate 31. A valve core shaft 32 is provided at one end of the guide plate 31, axially arranged along the connecting pipe 10. The valve core shaft 32 faces the female pipe 12. A valve head 33 is sleeved on the outside of the valve core shaft 32. The valve head 33 moves axially along the valve core shaft 32, and the axial movement space is restricted by the guide plate 31 and the inner wall of the valve chamber 20. An elastic element 34, which is a spring, is provided between the valve core shaft 32 and the valve head 33. When the elastic element 34 is compressed, the elastic potential energy generated forces the valve head 33 to move towards one end of the valve cavity 20 and tends to close one end of the valve cavity 20. The valve core assembly 30 acts as a piston switch in the valve cavity 20, allowing the medium inside the connecting pipe 10 to flow in only one direction. As for the installation position of the spring, it can be installed either axially outside the valve core shaft 32 or circumferentially outside the valve head 33.

[0023] In this embodiment, a shrinkage orifice 21 is provided at one end of the valve cavity 20 near the mother pipe 12. The shrinkage orifice 21 concentrates the edge of the closed end towards the center, reducing the difficulty of sealing the valve cavity 20. The circumferential edge of the shrinkage orifice 21 is provided with an annular edge 22 protruding towards one end of the valve cavity 20. The annular edge 22 is connected to the valve head 33, reducing the contact area between the valve head 33 and the closed end. At the same time, there is a gap between the annular edge 22 and the inner wall of the valve cavity 20, which weakens the reverse extrusion pressure of the medium inside the male pipe 11 on the valve head 33 and avoids the problem of extrusion deformation.

[0024] The valve head 33 has a T-shaped cross-section and the outer diameter of the valve head 33 near the annular side 22 is larger than the outer diameter of the valve head 33 away from the annular side 22, which reduces the space occupied by the valve head 33 in the valve cavity 20.

[0025] The end of the valve head 33 near the annular edge 22 is flat and the circumferential edge of the valve head 33 is larger than the circumferential edge of the annular edge 22. The valve head 33 is flush with the annular edge 22, which improves the response speed of the valve core assembly 30 compared to the embedded sealing method.

[0026] A mounting protrusion 35 is provided at the middle of one end of the valve head 33. A sealing gasket 36 that can contact the annular edge 22 is sleeved on the mounting protrusion 35. The mounting protrusion 35 serves as a mounting fulcrum to facilitate the installation of the sealing gasket 36. The sealing gasket 36 is flush with the end face of the mounting protrusion 35 to ensure the flatness of the closed end of the valve head 33. Moreover, the soft contact between the sealing gasket 36 and the annular edge 22 improves the sealing reliability of the valve core assembly 30.

[0027] The valve chamber 20 near the male pipe 11 forms a tapered section 23 with an inner diameter that gradually decreases toward the male pipe 11. The tapered section 23 is used to balance the flow rate of the input pipe and the output pipe.

[0028] It is conceivable that, through the valve core assembly 30, when the medium in the pipe flows from the mother pipe 12 to the male pipe 11, the pressure of the medium in the pipe is greater than the elastic force of the elastic element 34, which can squeeze the valve head 33. When the medium in the pipe flows from the male pipe 11 to the mother pipe 12, it acts on the valve head 33, further increasing the sealing strength in the valve cavity 20.

[0029] The connecting pipe body 10 of this utility model adopts a threaded connection and welding method with the outer wall pipe, which facilitates the initial placement and positioning of the valve core assembly 30, reduces the difficulty of the process, increases the structural strength of the connecting pipe body 10, improves the sealing strength, and the welded surface is flat, improving the aesthetics.

[0030] Example 2: This utility model also provides a carbon dioxide refrigeration device with a piston-type check valve as described above. Except for the piston-type check valve, the other components are all prior art or commercially available parts, and will not be described in detail here.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A piston-type check valve, characterized in that, include: The connecting pipe body (10) includes an axially connected male pipe (11) and female pipe (12) and a valve cavity (20) connecting the male pipe (11) and female pipe (12). The female pipe (12) is sleeved on the circumferential outer side of one end of the male pipe (11) and threadedly connected to the male pipe (11). The inner wall of one end of the female pipe (12) is provided with an installation step (15) that can be spaced apart from the end of the male pipe (11). The outer wall of one end of the male pipe (11) is provided with a welding step (16) that allows the end of the female pipe (12) to be axially connected. A recessed annular welding groove (17) is formed at the welding step (16). The valve core assembly (30) includes a guide plate (31) disposed on the mounting step (15) and communicating with the two valve chambers (20), a valve core shaft (32) disposed axially along the connecting pipe body (10) at one end of the guide plate (31), a valve head (33) sleeved on the outside of the valve core shaft (32), and an elastic member (34) disposed between the valve core shaft (32) and the valve head (33), which forces the valve head (33) to have a tendency to move toward one end of the valve chamber (20) and to close one end of the valve chamber (20).

2. The piston-type check valve according to claim 1, characterized in that, The male tube (11) has an annular shoulder (18) at one end near the annular welding groove (17), and the female tube (12) has an annular notch (19) at one end near the annular welding groove (17). The annular shoulder (18) and the annular notch (19) are spaced apart to form the annular welding groove (17) described above.

3. The piston-type check valve according to claim 1, characterized in that, The valve cavity (20) has a shrinkage hole (21) at one end near the main tube (12), and the shrinkage hole (21) has an annular edge (22) protruding toward one end of the valve cavity (20) on its circumferential edge.

4. The piston-type check valve according to claim 3, characterized in that, The valve head (33) has a T-shaped cross-section and the outer diameter of the valve head (33) near the annular side (22) is greater than the outer diameter of the valve head (33) away from the annular side (22).

5. The piston-type check valve according to claim 4, characterized in that, The valve head (33) is flat at one end near the annular edge (22) and its circumferential edge is larger than the circumferential edge of the annular edge (22).

6. The piston-type check valve according to claim 5, characterized in that, The valve head (33) has a mounting protrusion (35) at the middle of one end, and the mounting protrusion (35) is fitted with a sealing gasket (36) that can connect with the annular edge (22).

7. The piston-type check valve according to claim 1, characterized in that, The valve cavity (20) near the male pipe (11) forms a tapered section (23) with an inner diameter that gradually decreases toward the male pipe (11).

8. A carbon dioxide refrigeration device, characterized in that, A piston-type check valve as described in any one of claims 1-7.

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