Drain valve with replaceable valve needle and water flow distributor

Abstract

The utility model provides a drain valve with a replaceable valve needle and a water flow distributor. The drain valve with the replaceable valve needle comprises a valve body, a valve needle limiting piece and the valve needle. The fluid inlet end of the valve body is connected to the water flow distributor body, and an inner cavity of the valve body forms a fluid channel. The valve needle limiting piece is detachably connected to the end, away from the fluid inlet, of the valve body, and a limiting part extending in the radial direction of an inner cavity of the valve body is formed on the valve needle limiting piece. The valve needle comprises a valve rod and a protruding part formed on the peripheral wall of the valve rod, the valve rod extends into the valve body inner cavity and is in threaded connection with the valve body, the front end of the valve rod opens or blocks a fluid channel in the valve body, and the protruding part is located in the valve body inner cavity, close to the fluid inlet side, of the limiting part. The limiting part is configured to abut against and block the protruding part on the valve needle in the axial direction of the valve body when the fluid channel is opened by the valve rod.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, and in particular to a drain valve with replaceable valve needle and a water flow distributor. Background Art

[0002] Water flow distributors are usually divided into water distributors and water collectors. In order to facilitate air conditioner maintenance, winter shutdown drainage, or air pressure balance adjustment in the water collection circuit, a drain valve is usually required on the water collector. In existing water flow distributors, the drain valve is mostly connected to the distributor body with threads, and sealant is applied to the threads during connection to achieve a sealed connection. This assembly method not only has complicated procedures, but also relies on sealant for sealing at the connection, and sealant is difficult to withstand high temperatures. When the water flow distributor is connected to the external pipeline, the radiation and conduction of welding heat can easily melt the sealant, which in turn causes leakage at the threaded assembly. In addition, some people have proposed to apply sealant on the threads after the water flow distributor body is welded to the external pipeline for a sealed connection; although this assembly method can avoid the influence of high welding temperature on the sealant, it is difficult to install the drain valve or even difficult to install due to the limitation of the assembly space in the external pipeline during installation.

[0003] To this end, the applicant proposed a new water flow distributor structure in which the valve body of the drain valve is directly welded to the main body of the distributor. This structure is not only convenient for assembling the drain valve, but more importantly, the valve body of the drain valve and the main body of the water flow distributor are sealed and connected by a high-strength, high-temperature resistant solder layer, which effectively ensures the connection strength and sealing of the drain valve after the water flow distributor is welded to the external pipeline. However, in the drain valve, the valve needle sealing part will inevitably deform and wear when linearly sealing with the valve body. After long-term use, the valve needle will find it difficult to block the water flow channel in the valve body and leakage will occur. In the existing drain valve, the valve needle and the valve body are an integral and inseparable structure, and the welding of the drain valve and the main body of the water flow distributor also makes it difficult to disassemble the two. Once a leak occurs in the drain valve, it is necessary to replace the water flow distributor as a whole, or heat and melt the solder layer between the valve body of the drain valve and the main body of the water flow distributor to achieve the replacement of the drain valve. The integral replacement of the water flow distributor is not only labor-intensive and difficult, but also very costly. The melting of the solder layer to remove the drain valve and the re-welding of the new drain valve will transfer the welding heat to the branch pipe of the water flow distributor, thereby causing secondary welding and leakage at the branch pipe welding point. Not only is replacement and maintenance difficult, but it also poses a greater hidden danger to the overall safety of the product. Utility Model Content

[0004] In order to overcome at least one shortcoming of the prior art, the utility model provides a drain valve with replaceable valve needle and a water flow distributor.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a drain valve with replaceable valve needle, which includes a valve body, a valve needle stopper and a valve needle. The valve body is a hollow structure with two open ends and its fluid inlet end is connected to the water flow distributor body, and the inner cavity of the valve body forms a fluid channel. The valve needle stopper is detachably connected to the end of the valve body away from the fluid inlet, and a limiter extending radially toward the inner cavity of the valve body is formed on the valve needle stopper. The valve needle includes a valve stem and a protrusion formed on the outer peripheral wall of the valve stem, the valve stem extends into the inner cavity of the valve body and is threadedly connected to the valve body, the front end of the valve stem opens or blocks the fluid channel in the valve body, the protrusion is located in the inner cavity of the valve body near the fluid inlet side of the limiter, and the limiter is configured to abut and block the protrusion on the valve needle in the axial direction of the valve body when the valve stem opens the fluid channel.

[0006] According to one embodiment of the utility model, the valve needle limiter is a valve needle sealing cap which is detachably covered on the end of the valve body, a through hole for the valve stem and the protrusion to pass through is formed on the end face of the valve needle sealing cap, and at least one point-shaped limiter which radially protrudes toward the inner cavity of the valve body is formed on the inner wall of the through hole.

[0007] According to an embodiment of the present invention, the valve needle sealing cap is detachably connected to the end of the valve body by means of adhesive connection; or, the valve needle sealing cap is detachably connected to the end of the valve body by means of threaded connection.

[0008] According to one embodiment of the utility model, a limit member assembly hole is formed on the side wall of the valve body at one end away from the fluid inlet, the valve needle limit member is detachably connected to the limit member assembly hole and the assembly front end of the valve needle limit member extends into the inner cavity of the valve body to form a limit portion blocking the protrusion of the valve needle, and the valve needle limit member is a pin or a limit screw.

[0009] According to one embodiment of the utility model, a mounting groove is formed on the inner wall of one end of the valve body away from the fluid inlet, and the valve needle limiter is an annular elastic member, a part of which is embedded and fixed in the mounting groove, and the other part extends toward the center of the cross-section of the inner cavity of the valve body to form an annular limiting portion, and the valve needle limiter is a retaining spring or an elastic plastic retaining ring.

[0010] According to an embodiment of the utility model, the valve stem includes a rod body with external threads, a sealing portion formed at the front end of the rod body to open or block the fluid channel, and a screwing portion formed at the rear end of the rod body and located outside the valve body.

[0011] According to an embodiment of the utility model, the drain valve with replaceable valve needle further includes a sealing ring, a bearing step is formed on the inner wall of the valve body, and the sealing ring is pressed between the bearing step and the protruding portion of the valve needle.

[0012] According to one embodiment of the utility model, a water outlet is formed on the side wall of the valve body, and the water outlet is connected to the fluid channel when the valve needle opens the fluid channel; the valve needle replaceable drain valve also includes a drain nozzle welded or threadedly connected to the water outlet.

[0013] On the other hand, the utility model also provides a water flow distributor, which is used in a refrigeration system and includes a distributor body and the above-mentioned needle-replaceable drain valve. The distributor body has a drain hole, and the fluid inlet end of the valve body of the needle-replaceable drain valve is welded to the distributor body and communicates with the drain hole.

[0014] According to one embodiment of the utility model, the water flow distributor also includes a drain valve connecting seat, which is welded to the peripheral wall of the distributor body where the drain hole is located, and a connecting hole is formed on the drain valve connecting seat; the valve body of the drain valve with replaceable valve needle is welded to the connecting hole on the drain valve connecting seat and / or the drain hole on the distributor body.

[0015] According to one embodiment of the utility model, the distributor body includes a threaded cylinder, a thin-walled body, a branch pipe connecting plate and a plurality of branch pipes. The threaded cylinder is hollow and has a connecting thread. The thin-walled body is open at both ends and one end is connected to the threaded cylinder. A drain hole for connecting or communicating with a replaceable drain valve with a valve needle is formed on the thin-walled body. The branch pipe connecting plate is embedded in the other end of the thin-walled body. The branch pipe connecting plate includes at least one panel and the outer surface of the panel farthest from the threaded cylinder is roughly flat. A plurality of branch pipe holes are formed on each panel. The branch pipe connecting plate, the thin-walled body and the threaded cylinder are all made of stainless steel. The plurality of branch pipes are respectively welded to the corresponding branch pipe holes on at least one panel.

[0016] According to one embodiment of the utility model, the distributor body includes a main body, a threaded connection column and a plurality of branch pipes. The main body is in the shape of a cylinder with a single open end, and the bottom of the main body has a plurality of branch pipe holes, and the side wall of the main body is formed with a drainage hole for connecting or communicating with a replaceable valve needle drainage valve. The threaded connection column is connected to the open end of the main body, or connected to the connection hole on the end plate of the open end of the main body. The plurality of branch pipes are respectively welded and connected to the plurality of branch pipe holes at the bottom of the main body.

[0017] According to one embodiment of the utility model, the distributor body includes a body, an end cover and a plurality of branch pipes. The body is in the shape of a tube with both ends open and a connecting thread formed at one end, and a drainage hole for connecting or communicating with a replaceable valve needle drainage valve is formed on the side wall of the body. The end cover is covered on the other end of the body and a plurality of branch pipe holes are formed on the end cover. The plurality of branch pipes are respectively welded to the plurality of branch pipe holes on the end cover.

[0018] According to an embodiment of the utility model, the distributor body includes a main body and a plurality of branch pipes. The main body is an integrated single-end open structure, the open end of the main body is provided with a connecting thread, the other end thereof is in a closed ball head shape and a plurality of branch pipe holes are opened at the ball head shape, and a drainage hole for connecting or communicating with a replaceable valve needle type drainage valve is formed on the main body. The plurality of branch pipes are respectively welded to the plurality of branch pipe holes on the main body.

[0019] According to one embodiment of the utility model, the distributor body includes a main pipe, a collection pipe and a plurality of branch pipes. The main pipe has a collection pipe hole and a plurality of branch pipe holes. One end of the collection pipe is welded to the collection pipe hole on the main pipe, and a connecting thread is formed on the other end. A drainage hole for connecting or communicating with a replaceable valve needle drainage valve is formed on the pipe wall of the collection pipe. The plurality of branch pipes are respectively welded to the plurality of branch pipe holes on the main pipe.

[0020] According to one embodiment of the utility model, the distributor body includes a box-type body, two collecting joints and a plurality of branch pipes. The box-type body has a collecting chamber and a diversion chamber that are not connected to each other, and a drainage hole for connecting or connecting to a replaceable drain valve with a valve needle is formed on the side wall of the box-type body where the collecting chamber is located. The two collecting joints are both arranged on the box-type body and are respectively connected to the collecting chamber and the diversion chamber, and each collecting joint is formed with a connecting thread. The plurality of branch pipes are all arranged on the box-type body, wherein a part of the branch pipes are connected to the collecting chamber, and another part of the branch pipes are connected to the diversion chamber.

[0021] In summary, in the valve needle replaceable drain valve provided by the utility model, a detachable valve needle stopper is provided on one end of the valve body away from the fluid inlet, and a protrusion is formed on the outer peripheral wall of the valve stem. In the working state, the protrusion on the valve needle extends into the inner cavity of the valve body and is located on the side of the limiter close to the fluid inlet. This arrangement enables the limiter on the valve needle stopper to abut and block the protrusion that follows the movement of the valve stem to prevent the valve needle from leaving the valve body when the valve stem moves axially along the valve body to open the fluid channel. When the valve needle is deformed or worn and causes leakage of the drain valve, the valve needle stopper can be removed to eliminate the obstruction of the valve needle protrusion, and the valve needle and the valve body are in a separated state to achieve replacement of the valve needle. In the drain valve provided by the utility model, when the valve needle is deformed or worn, it only needs to replace the valve needle to solve the leakage problem, without any disassembly and replacement of the valve body and the water flow distributor. It is not only convenient to repair and replace, but also has low maintenance costs and the maintenance method is not limited by the connection method of the drain valve body.

[0022] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic structural diagram of a drain valve with replaceable valve needle provided in the first embodiment of the present invention.

[0024] Figure 1A Shown Figure 1 Schematic diagram of the structure in which the limit part blocks the raised part on the valve needle when the middle valve needle opens the fluid channel.

[0025] Figure 2 Shown Figure 1 A magnified schematic diagram of center A.

[0026] Figure 3 Shown Figure 1 Schematic diagram of the structure of the middle valve needle limiter.

[0027] Figure 4 Shown Figure 3 Schematic cross-section diagram of .

[0028] Figure 5 Shown Figure 1 Schematic diagram of the structure of the valve body.

[0029] Figure 6 Shown is a schematic structural diagram of a drain valve with replaceable valve needle provided in another embodiment of the utility model.

[0030] Figure 7 Shown Figure 6 A magnified schematic diagram of point B in the middle.

[0031] Figure 8 Shown Figure 6 Schematic diagram of the structure of the middle valve needle limiter.

[0032] Fig. 9 Shown Figure 8 Schematic cross-section diagram of .

[0033] Fig.10 Shown is a schematic structural diagram of a drain valve with replaceable valve needle provided in another embodiment of the utility model.

[0034] Fig.11 Shown is a schematic structural diagram of a water flow distributor provided in Embodiment 1 of the present utility model.

[0035] Fig.12 Shown Fig.11 Schematic cross-section diagram of .

[0036] FIG. 13A to FIG. 13G Shown is a schematic structural diagram of a water flow distributor provided by another embodiment of the utility model.

[0037] Fig.13H and Fig.13I for Figure 13G Schematic diagram of the structure from another perspective.

[0038] Fig.14 Shown is a schematic structural diagram of a drain valve with replaceable valve needle provided in the second embodiment of the present utility model.

[0039] Fig.15 Shown Fig.14 Enlarged schematic diagram of point C in the middle.

[0040] Fig.16 Shown Fig.14Schematic diagram of the structure of the middle valve needle limiter.

[0041] Fig.17 Shown is a schematic structural diagram of a drain valve with replaceable valve needle provided in another embodiment of the utility model.

[0042] Fig.18 Shown Fig.17 Schematic diagram of the structure of the middle valve needle limiter.

[0043] Fig.19 Shown is a schematic structural diagram of a drain valve with replaceable valve needle provided in the third embodiment of the present utility model.

[0044] Fig. 20 Shown Fig.19 Schematic diagram of the structure of the middle valve needle limiter. DETAILED DESCRIPTION

[0045] Embodiment 1

[0046] In the drain valve on the existing water flow distributor, the valve needle and the valve body are assembled into an inseparable integral structure. When the valve needle is deformed or worn and causes the drain valve to leak, the valve body needs to be removed from the water flow distributor body for replacement and repair. However, when the drain valve body and the water flow distributor body are connected by a high-strength structure that is difficult to disassemble (such as a welded connection) or the valve body and the water flow distributor body are integrally formed, it is even necessary to replace the entire water flow distributor to solve the leakage problem caused by the deformation or wear of the valve needle. Obviously, this repair and replacement method is not only complicated in process but also high in maintenance cost.

[0047] To this end, this embodiment provides a drain valve with a replaceable valve needle. When the valve needle is deformed or worn, the drain valve leakage problem can be solved by simply replacing the valve needle. Figure 1 As shown, the valve needle replaceable drain valve 200 provided in this embodiment includes a valve body 1, a valve needle stopper 2 and a valve needle 3. The valve body 1 is a hollow structure with two ends open and its fluid inlet end 11 is connected to the water flow distributor body, and the inner cavity of the valve body 1 forms a fluid channel 10. The valve needle stopper 2 is detachably connected to the end 12 of the valve body 1 away from the fluid inlet, and a stopper 21 is formed on the valve needle stopper 2 and extends radially toward the inner cavity of the valve body. The valve needle 3 includes a valve stem 31 and a protrusion 32 formed on the outer peripheral wall of the valve stem 31. The valve stem 31 extends into the inner cavity of the valve body and is threadedly connected to the valve body 1. The front end of the valve stem 31 opens or blocks the fluid channel 10 in the valve body. The protrusion 32 is located in the inner cavity of the valve body near the fluid inlet side of the stopper 21. The stopper 21 is configured to abut and block the protrusion 32 on the valve needle 3 in the axial direction of the valve body 1 when the valve stem 31 opens the fluid channel 10.

[0048] In the valve needle replaceable drain valve provided in this embodiment, the detachable valve needle stopper 2 has two connection states. Under normal working conditions, the valve needle stopper 2 is connected to the end 12 of the valve body 1 away from the fluid inlet. When draining water and releasing pressure, the valve needle 3 is rotated to make the valve stem 31 and the protrusion 32 retreat along the axial direction of the valve body, and the front end of the valve stem 31 opens the water flow channel 10. At this time, the limiting part 21 on the valve needle stopper 2 limits the protrusion 32 in the axial direction of the valve body to prevent the valve needle 31 from separating from the valve body 1 when rotating and retreating; that is, under working conditions, the valve needle 3 and the valve body 1 are an inseparable integral structure. When the sealing portion 311 at the front end of the valve needle 3 is deformed or worn, resulting in sealing failure, the valve needle limiter 2 can be removed from the valve body 1 to release the blocking and limiting effect of the protrusion 32 when the valve needle 3 retreats, thereby making the valve body 1 and the valve needle 3 have a detachable structure; in this state, the valve needle 3 can be separated from the valve body 1 by continuing to screw out the valve needle 3, and then a new valve needle 3 can be replaced and the valve needle limiter 2 can be reassembled.

[0049] In the valve needle replaceable drain valve provided in this embodiment, the detachable valve needle stopper 2 provides conditions for the separation of the valve needle 3 and the valve body 1, so that when the valve needle is worn or deformed, only the valve needle 3 needs to be replaced, without any maintenance or disassembly of the valve body 1. This arrangement is not only convenient, simple and low-cost for maintenance; but also when designing the assembly method between the valve body 1 and the water flow distributor body, there is no need to consider the leakage problem caused by the deformation and wear of the valve needle 3, which provides more options for the assembly of the valve body 1; the valve body 1 can be directly welded to the water flow distributor body or threadedly connected to the water flow distributor body and then sealed by brazing, or it can be integrally formed with the water flow distributor body.

[0050] Specifically, Figure 1As shown, the valve stem 31 includes a rod body 312 with external threads, a sealing portion 311 formed at the front end of the rod body 312 to open or block the fluid channel, and a twisting portion 313 formed at the rear end of the rod body 312 and located outside the valve body 1. The valve body 1 has a small aperture section 13 located upstream and connected to the fluid inlet and a large aperture section 14 located downstream. The small aperture section 13 and the large aperture section 14 form a fluid channel 10; the downstream or upstream is divided according to the direction of the water flow in the drain valve during drainage, and the water flows from the upstream to the downstream. The side wall of the large aperture section 14 is provided with an internal thread that matches the external thread on the rod body 312. Applying force to the twisting portion 313 can make the valve stem 31 move forward along the axial direction of the valve body 1 so that the sealing portion 311 blocks the water flow channel 10 or retreat along the axial direction of the valve body 1 to open the water flow channel 10. The protrusion 32 is formed on the outer peripheral wall of the rod body 312 to follow the movement of the valve stem 31. The sealing portion 311 is in a truncated cone or cone shape that partially extends into the small aperture section 13 in the blocking state, and the conical outer peripheral wall of the sealing portion 311 blocks the small aperture section 13 to achieve the blocking of the water flow channel 10. However, the present invention does not make any limitation to this. In other embodiments, the sealing portion may also be spherical, and the spherical portion is embedded in the small aperture section in the blocking state to block it. Alternatively, in other embodiments, the sealing portion may also be set to other shapes that can block the small aperture section.

[0051] In this embodiment, if Figure 3 and Figure 4 As shown, the valve needle stopper 2 is a valve needle sealing cap detachably covered on the end of the valve body 1, and a through hole 22 for the valve stem 31 and the protrusion 32 to pass through is formed on the end surface of the valve needle stopper 2, and two dot-shaped stoppers 21 protruding radially toward the inner cavity of the valve body are formed on the inner wall of the through hole 22. The dot-shaped stoppers 21 block and limit the protrusion 32 in the axial direction, while still leaving enough space on the through hole 22 for the protrusion 32 on the valve needle 3 to pass through.

[0052] When assembling the valve needle 3, first insert the valve needle sealing cap as the valve needle stopper 2 into the valve needle 3. Specifically, insert the front end of the valve stem 31 into the through hole 22 on the valve needle sealing cap, and tilt the valve stem 31 so that the protrusion 32 avoids the two point-shaped stoppers 21 on the inner wall of the through hole 22; then, insert the valve stem 31 into the valve body 1, and the valve needle sealing cap is detachably connected to the end of the valve body 1; finally, apply force to the screwing part 313 on the valve stem 31 so that the stem 312 is threadedly locked in the valve body 1, and the sealing part 311 at the front end of the valve stem 31 is pressed forward and embedded in the small-diameter section 13 to block the water flow channel 10. When draining water and releasing pressure, the screwing part 313 is rotated in the reverse direction to make the sealing part 311 separate from the small-diameter section 13 to open the water flow channel 10. At the same time, the two dot-shaped limiting parts 21 on the valve stem limiting member 2 limit the protrusion 32 on the outer peripheral wall of the valve stem 31 to prevent the valve needle 3 from separating from the valve body 1. When the sealing part 311 at the front end of the valve stem 31 is worn or deformed, the valve needle sealing cap is removed from the end of the valve body 1, the protrusion 32 on the valve needle 3 loses the limiting barrier, and the valve needle 3 is screwed in the reverse direction to be pulled out of the valve body 1; then, the valve stem 31 is tilted again to make the protrusion 32 avoid the two dot-shaped limiting parts 21 on the valve stem limiting member 2, and the valve stem 31 is separated from the through hole 22 on the valve needle sealing cap to realize the removal of the valve needle 3. Finally, a new valve needle is replaced and the valve needle sealing cap is reconnected to the end 12 of the valve body 1 away from the fluid inlet to realize the replacement of the valve needle 3.

[0053] like Figure 3 As shown, two point-shaped limiting portions 21 are symmetrically distributed on the inner wall of the through hole 22. This arrangement enables the through hole 22 to have a minimum inner diameter at the apex of the two point-shaped limiting portions 21. At this time, even if there is a coaxiality error between the valve needle 3 and the through hole 22, the two point-shaped limiting portions 21 can stably limit the protrusion 32 on the valve needle 3; in addition, the symmetrical structure is also more conducive to processing. However, the utility model does not impose any restrictions on the number of point-shaped limiting portions and their distribution positions. In other embodiments, the number of point-shaped limiting portions may also be one or more than three, and the angle between adjacent point-shaped limiting portions may also be 90 degrees or other angles.

[0054] Although the present embodiment is described by taking the annular protrusion as an example, the present invention does not impose any limitation on this. In other embodiments, a dot-shaped protrusion corresponding to the dot-shaped limiting portion may be formed on the outer peripheral wall of the rod body; that is, in the axial direction of the valve body, the corresponding dot-shaped protrusion on the valve needle abuts against the dot-shaped limiting portion on the valve needle limiting member to achieve axial limiting of the valve needle in the open state.

[0055] In this embodiment, the valve needle sealing cap serving as the valve needle stopper 2 is detachably covered on the end 12 of the valve body 1 away from the fluid inlet by means of adhesive connection. In this structure, the adhesive layer only serves to connect the valve needle stopper 2, but does not have a sealing function; and further, the valve needle stopper 2 is far away from the main body of the water flow distributor, and the heat from the welding of the water flow distributor and the external pipeline will hardly be transferred to the valve needle stopper 2, so it will not affect the connection strength of the adhesive layer. However, the present invention does not impose any limitation on this. In other embodiments, such as Figures 6 to 8 As shown, an external connecting thread 15 can also be formed on the end of the valve body 1 away from the fluid inlet, and the valve needle sealing cap serving as the valve needle limiter 2 can be detachably connected to the end of the valve body 1 by means of a threaded connection; specifically, an internal connecting thread 25 matching the external connecting thread is provided on the inner wall of the valve needle sealing cap.

[0056] In this embodiment, if Figure 3 and Figure 4 As shown in the figure, the valve needle sealing cap as the valve needle stopper 2 includes a cap 23 and an annular peripheral wall 24 extending along the outer peripheral edge of the cap 23. The annular peripheral wall 24 is surrounded by a polygonal inner cavity to match the polygonal outer wall of the valve body end. The through hole 22 is formed on the cap 23. Preferably, the annular peripheral wall 24 is surrounded by a hexagonal inner cavity. However, the utility model does not make any limitation to this. In other embodiments, such as Figure 8 As shown, a circular inner cavity may also be formed in the annular peripheral wall 24 to cover the end of the valve body.

[0057] In this embodiment, the valve needle stopper 2 is a metal sealing cap made of stainless steel. However, the present invention does not make any limitation to this. In other embodiments, the valve needle sealing cap can also be a plastic sealing cap formed by injection molding of plastic or made of other metal materials.

[0058] In this embodiment, a water outlet 16 is formed on the side wall of the valve body 1, and the water outlet 16 is connected to the fluid channel 10 when the valve needle 3 opens the fluid channel 10; the valve needle replaceable drain valve 200 also includes a drain nozzle 4 welded to the water outlet 16 and made of metal material. Preferably, the valve body 1 and the drain nozzle 4 are both made of stainless steel material, and both can be integrally welded together with the stainless steel parts on the water flow distributor by furnace brazing, which further simplifies the assembly structure of the drain valve and reduces assembly leakage points, thereby greatly improving the overall sealing of the product. However, the utility model does not limit this in any way. In other embodiments, the drain nozzle can also be made of other materials, such as copper material or plastic injection molding; and it can also be threadedly connected to the water outlet on the valve body.

[0059] Although the present embodiment is described by taking the water outlet hole formed on the side wall of the valve body as an example, the present invention does not make any limitation to this. In other embodiments, the side wall of the valve body may not need to be provided with a water outlet hole, but the end 12 of the valve body away from the fluid inlet may be used as the water outlet hole for water discharge and pressure relief, such as Fig.10 Specifically, in this structure, when the sealing portion 311 at the front end of the valve stem 31 opens the fluid channel 10, the water will flow along the gap between the valve stem 31 and the inner wall of the valve body 1 to the end 12 of the valve body away from the fluid inlet and be discharged; at this time, in order to prevent the water from spraying onto the operator, the area of ​​the twisting portion can be increased so that it can block the discharged water.

[0060] like Figure 1 As shown, the valve needle replaceable drain valve provided in this embodiment further includes a sealing ring 5, and a bearing step 17 is formed on the inner wall of the valve body 1. The sealing ring 5 can prevent water from leaking from the valve body 1 away from the fluid inlet end 12 when the valve needle 3 opens the fluid channel 10.

[0061] Corresponding to the above-mentioned needle-replaceable drain valve, this embodiment also provides a water flow distributor for use in a refrigeration system. The water flow distributor includes a distributor body 100 and a needle-replaceable drain valve 200 (hereinafter referred to as drain valve 200) provided in this embodiment. The distributor body 100 has a drain hole 10A, and the fluid inlet end 11 of the valve body 1 in the drain valve 200 is connected to the drain hole 10A.

[0062] like Fig.11 and Fig.12 As shown, in this embodiment, the distributor body 100 is a combined structure, which includes a threaded cylinder 101, a thin-walled body 102, a branch pipe connecting plate 103 and a plurality of branch pipes 104. The threaded cylinder 101 is hollow and has a connecting thread 10C. The thin-walled body 102 is open at both ends and one end is connected to the threaded cylinder 101. The thin-walled body 102 is formed with a drainage hole 10A connected to the water flow channel 10 in the drainage valve 200. The branch pipe connecting plate 103 is embedded in the other end of the thin-walled body 102. The branch pipe connecting plate 103 includes at least one panel 1031 and the outer surface of the panel 1031 farthest from the threaded cylinder 101 is roughly flat. A plurality of branch pipe holes 10B are formed on each panel 1031. Each branch pipe 104 includes a stainless steel section and a copper connecting section. The stainless steel section of each branch pipe is inserted and welded into the corresponding branch pipe hole 10B on at least one panel 1031.

[0063] In this embodiment, the wall thickness of the thin-walled body 102 is relatively thin, usually between 0.5 mm and 2.5 mm; correspondingly, the hole depth of the drain hole 10A formed on the thin-walled body 2 is also very short, and the valve body 1 will be difficult to be directly welded into the drain hole 10A. For this reason, the water flow distributor provided in this example also includes a drain valve connection seat 300, and the drain valve connection seat 300 is welded to the peripheral wall of the thin-walled body 102 where the drain hole 10A is located. A connection hole 301 is formed on the drain valve connection seat 300, and the valve body 1 of the drain valve 200 is welded to the connection hole 301 on the drain valve connection seat 300 and connected to the drain hole 10A. However, the utility model does not make any limitation to this. In other embodiments, the valve body 1 can also extend into the drain hole 10A, and the hole depth of the connection hole 301 and the hole depth of the drain hole 10A together provide the welding depth for the valve body 1, ensuring the connection strength and air tightness of the valve body 1 after welding. In other embodiments, when the wall thickness of the thin-walled body meets the welding depth requirement of the valve body, there is no need to set a drain valve connection seat. At this time, the valve body is directly welded to the drain hole, or threaded into the drain hole and sealed by brazing.

[0064] In the distributor body 100 provided in this embodiment, the threaded cylinder 101, the thin-walled body 2 and the branch pipe connecting plate 3 are all made of stainless steel, and the drain valve connecting seat 300, the valve body 1 on the drain valve 200 and the drain nozzle 4 are also made of stainless steel. Therefore, the threaded cylinder 101, the thin-walled body 102, the branch pipe connecting plate 103, the multiple branch pipes 104, the drain valve connecting seat 300, the valve body 1 and the drain nozzle 4 are integrally welded and formed by furnace brazing after assembly. After welding, the valve needle stopper 2 is sleeved on the outside of the valve stem 31. When sleeved, the valve stem 31 and the valve needle stopper 2 are relatively tilted so that the protrusion 32 on the valve stem and the stopper 21 on the valve needle stopper 2 avoid each other; then, the valve needle stopper 2 is glued to the end of the valve body 1, and the valve stem 31 is screwed into the valve body 1 to block the water flow channel 10. As mentioned above, when the sealing portion 311 at the front end of the valve needle 3 is deformed or worn to cause leakage of the drain valve, the valve needle stopper 2 can be removed to achieve replacement of the valve needle 3 .

[0065] Although this embodiment uses the combined distributor body 100 with low material cost, convenient branch pipe welding and strong versatility of thin-wall body as an example to illustrate the application of the valve needle replaceable drain valve 200 provided in this embodiment, the present invention does not make any limitation to this. The drain valve provided in this embodiment can also be applied to distributor bodies of other structures.

[0066] FIG. 13A to FIG. 13G The figure shows the application of the drain valve 200 with replaceable valve needle provided in this embodiment on other dispenser bodies 100 .

[0067] exist Fig.13AIn the water flow distributor shown, the structure of the distributor body 100 is basically the same as that of the present embodiment, except that the axial length of the thin-walled body 102 is relatively long. The water flow distributor of this structure is mainly used in fan coil cassette units.

[0068] exist Fig. 13B In the embodiment, the distributor body 100 is also a modular structure, which includes a main body 102', a threaded connection column 101 and a plurality of branch pipes 104. The main body 102' is in the shape of a cylinder with a single end open, and the bottom of the main body 102' has a plurality of branch pipe holes 10B, and the side wall of the main body 102' is formed with a drainage hole 10A for connecting the drainage valve 200. The threaded connection column 101 is connected to the open end of the main body 102'. The plurality of branch pipes 104 are respectively welded and connected to the plurality of branch pipe holes 10B at the bottom of the main body 102'. Fig. 13B In the structure shown, the main body 102' and the threaded connection column 101 are both made of stainless steel, and the valve body 1, the drain valve connection seat 300 and the drain nozzle 4 can be integrally welded with the main body 102' and the threaded connection column 101 by furnace brazing. However, the present utility model does not impose any limitation on this. In other embodiments, the valve body can also be threadedly connected to the connection hole and / or the drain hole on the drain valve connection seat on the main body and sealed by brazing; the drain nozzle can also be threadedly connected to the connection hole and / or the drain hole on the drain valve connection seat on the valve body. In addition, in other embodiments, Fig. 13B An end plate is arranged on the open end of the main body, and a connecting hole for connecting a threaded connecting column is provided on the end plate.

[0069] exist Fig. 13C In the embodiment, the distributor body 100 includes a body 102', an end cover 105 and a plurality of branch pipes 104. The body 102 is in the shape of a tube with both ends open and a connecting thread 10C formed at one end. A drainage hole 10A for connecting a drainage valve 200 is formed on the side wall of the body 102'. The end cover 105 covers the other end of the body 102' and a plurality of branch pipe holes 10B are formed on the end cover 105. The plurality of branch pipes 104 are respectively welded to the plurality of branch pipe holes 10B on the end cover 105. Preferably, in Fig. 13C In the structure shown, the body 102' and the end cover 105 are both made of stainless steel, and each branch pipe 104 includes a stainless steel pipe and a copper pipe end. The body 102', the end cover 105, the plurality of branch pipes 104, the valve body 1 and the drain nozzle 4 are integrally welded by furnace brazing. However, the utility model does not make any limitation to this. In other embodiments, the valve body can also be welded to the drain hole on the body by other brazing processes, such as flame brazing.

[0070] exist Fig.13DIn the embodiment, the distributor body 100 includes a main body 102' and a plurality of branch pipes 104. The main body 102' is an integrated single-end open structure, the open end of the main body 102' is provided with a connecting thread 10C, the other end is in a closed ball head shape and a plurality of branch pipe holes 10B are opened at the ball head, and a drain hole 10A for connecting a drain valve 200 is formed on the main body 102'. The plurality of branch pipes 104 are respectively welded and connected to the plurality of branch pipe holes 10B on the main body 102'. Fig.13D In the structure shown, the body 102 ′ can be integrally formed by casting, and can be made of copper or stainless steel. The valve body 1 is welded to the drainage hole 10A on the body 102 ′.

[0071] exist Fig.13E In the embodiment, the distributor body 100 includes a main pipe 106, a collection pipe 107 and a plurality of branch pipes 104. The main pipe 106 has a collection pipe hole 1061 and a plurality of branch pipe holes 104. The collection pipe 107 has one end welded to the collection pipe hole 1061 on the main pipe 106, and the other end is formed with a connecting thread (due to the viewing angle Fig.13E The collecting pipe 107 has a drain hole 10A formed on its wall for connecting to the drain valve 200. The plurality of branch pipes 104 are respectively connected to the plurality of branch pipe holes 10B on the main pipe 106 by welding. Fig.13E The water flow distributor shown uses the inner cavity of the main pipe 106 as the water flow collection cavity or distribution cavity; preferably, the main pipe 106 and the collection pipe 107 are both made of stainless steel, and each branch pipe 104 includes a stainless steel pipe and a copper pipe end. The main pipe 106, the collection pipe 107, the multiple branch pipes 104, the valve body 1 and the drain nozzle 4 are brazed in a furnace to form an integral body. However, the present invention does not make any limitation to this. Fig.13E In the embodiment, the valve body of the drain valve 200 is not directly connected to the drain hole 10A, but is welded to the connection hole on the valve body connection seat 300 but communicates with the drain hole 10A. However, the present invention does not make any limitation to this. In other embodiments, the valve body can also be welded to the connection hole and the drain hole on the valve body connection seat.

[0072] Fig.13F The structure and Fig.13E The two valves are basically the same, except that a filter 108 is provided at the location of the drainage hole 10A on the collecting pipe 107, and the valve body 1 is connected to the filter 108 via the drainage hole 10A.

[0073] FIG. 13G to FIG. 13IProvided is a water flow distributor that integrates a water distributor and a water collector. In this structure, the distributor body 100 includes a box-type body 102', two collecting joints 109, 110 and a plurality of branch pipes 104. The box-type body 102' has a collecting chamber 1021' and a diversion chamber 1022' that are not connected to each other. A drainage hole for connecting a replaceable drain valve 200 with a valve needle is formed on the side wall of the box-type body 102' where the collecting chamber 1021' is located (not shown in the figure due to viewing angle). The two collecting joints 109, 110 are both arranged on the box-type body 102' and are respectively connected to the collecting chamber 1021' and the diversion chamber 1022', and a connecting thread 10C is formed on each collecting joint. A plurality of branch pipes 104 are all arranged on the box-type body 102', wherein a part of the branch pipes 104 are connected to the collecting chamber 1021', and another part of the branch pipes 104 are connected to the diversion chamber 1022'. Embodiment 2

[0074] This embodiment is basically the same as the first embodiment and its variations, except that the specific structure of the valve needle stopper 2 and the connection method between the valve needle stopper 2 and the valve body 1 are different.

[0075] like Figures 14 to 16 As shown, a limiter assembly hole 121 is formed on the side wall of the end 12 of the valve body 1 away from the fluid inlet, and the valve needle limiter 2 is detachably connected to the limiter assembly hole 121, and the assembly front end of the valve needle limiter 2 extends into the inner cavity of the valve body 1 to form a limiter 21 that blocks the protrusion 32 of the valve needle. Similar to the first embodiment, the valve needle limiter 2 of this example also has two states. When it is connected to the valve body 1, the limiter 21 blocks and limits the protrusion 32 on the valve needle 3 in the axial direction of the valve body 1 to prevent the valve needle 3 from being separated from the valve body 1. When the sealing part 311 at the front end of the valve needle 3 is deformed or worn, causing the drain valve to leak, the valve needle limiter 2 can be removed to release its axial blocking of the protrusion 32 and realize the separation and replacement of the valve needle 3.

[0076] When assembling the valve needle replaceable drain valve provided in this embodiment, the valve needle 3 can be inserted into the valve body first and then the valve needle limiter 2 can be assembled into the limiter assembly hole 121. The valve needle limiter 2 will not cause any interference to the assembly of the valve needle 3, and the assembly of the valve needle 3 will be more convenient.

[0077] In this embodiment, the valve needle stopper 2 is an L-shaped pin that is detachably engaged in the stopper assembly hole 121. However, the present invention does not make any limitation to this. Fig.17 and Fig.18 As shown, the valve needle stopper 2 may also be a stopper screw threadedly connected to the stopper assembly hole 121, such as a saddle screw.

[0078] Similar to the first embodiment, the valve needle replaceable drain valve provided in this embodiment is also suitable for Fig.11 as well as FIG. 13A to FIG. 13G In other embodiments, the valve body and the distributor body may be integrally formed.

[0079] Embodiment 3

[0080] This embodiment is basically the same as the first embodiment and its variations, except that the specific structure of the valve needle stopper 2 and the connection method between the valve needle stopper 2 and the valve body 1 are different.

[0081] like Fig.19 and Fig. 20 As shown, a mounting groove 122 is formed on the inner wall of the end 12 of the valve body 1 away from the fluid inlet, and the valve needle stopper 2 is an annular elastic member, a part of which is embedded in the mounting groove 122, and the other part extends toward the center direction of the cross section of the inner cavity of the valve body to form an annular stopper 21. In this embodiment, the valve needle stopper 2 is compressed and embedded in the mounting groove 122 by utilizing its elasticity. After embedding, the stopper 21 abuts against and blocks the protrusion 32 on the valve needle 3 in the axial direction of the valve body, thereby realizing the inseparable state of the valve body 1 and the valve needle 3 in the working state. When the sealing part at the front end of the valve needle 3 is deformed or worn and the drain valve leaks, the valve needle stopper 2 can be compressed again to remove it from the mounting groove 122, and then the valve stem 31 is screwed to separate it from the thread in the valve body 1, and then the valve stem 31 is pulled out to remove the old valve needle. When installing a new valve needle, the elastic valve needle stopper 2 can be inserted from the front end of the valve stem 31 and pushed between the screwing portion 313 and the protruding portion 32 on the valve stem 31. The valve needle 3 and the valve needle stopper 2 are assembled into the inner cavity of the valve body, and the valve needle stopper 2 is compressed by an assembly tool to be embedded in the installation groove 122; after the valve needle stopper 2 is assembled in place, the valve needle 3 is screwed to lock its thread in the valve body 1, and the sealing portion at the front end of the valve needle 3 blocks the water flow channel.

[0082] In this embodiment, the valve needle stopper 2 is a retaining spring. However, the present invention does not impose any limitation on this. In other embodiments, the valve needle stopper may also be an elastic plastic retaining ring with a certain strength; further, the thickness of the stopper portion may be set to be greater than the thickness of the portion embedded in the installation groove to enhance the stopper force.

[0083] Similar to the first embodiment, the valve needle replaceable drain valve provided in this embodiment is also suitable for Fig.11 as well as FIG. 13A to FIG. 13G In other embodiments, the valve body 1 and the distributor body on the water flow distributor may be integrally formed.

[0084] In summary, in the valve needle replaceable drain valve provided by the utility model, a detachable valve needle stopper is provided on one end of the valve body away from the fluid inlet, and a protrusion is formed on the outer peripheral wall of the valve stem. In the working state, the protrusion on the valve needle extends into the inner cavity of the valve body and is located on the side of the limiter close to the fluid inlet. This arrangement enables the limiter on the valve needle stopper to abut and block the protrusion that follows the movement of the valve stem to prevent the valve needle from leaving the valve body when the valve stem moves axially along the valve body to open the fluid channel. When the valve needle is deformed or worn and causes leakage of the drain valve, the valve needle stopper can be removed to eliminate the obstruction of the valve needle protrusion, and the valve needle and the valve body are in a separated state to achieve replacement of the valve needle. In the drain valve provided by the utility model, when the valve needle is deformed or worn, it only needs to replace the valve needle to solve the leakage problem, without any disassembly and replacement of the valve body and the water flow distributor. It is not only convenient to repair and replace, but also has low maintenance costs and the maintenance method is not limited by the connection method of the drain valve body.

[0085] Although the present invention has been disclosed as above by the preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope required by the claims.

Claims

1. A drain valve with replaceable valve needle, characterized in that: include: The valve body is a hollow structure with two open ends, and its fluid inlet end is connected to the water flow distributor body, and the inner cavity of the valve body forms a fluid channel; A valve needle stopper, detachably connected to an end of the valve body away from the fluid inlet, wherein the valve needle stopper is formed with a stopper portion extending radially toward the inner cavity of the valve body; The valve needle includes a valve stem and a protrusion formed on the outer peripheral wall of the valve stem, the valve stem extends into the inner cavity of the valve body and is threadedly connected to the valve body, the front end of the valve stem opens or blocks the fluid channel in the valve body, the protrusion is located in the inner cavity of the valve body near the fluid inlet side of the limiting part, and the limiting part is configured to abut and block the protrusion on the valve needle in the axial direction of the valve body when the valve stem opens the fluid channel.

2. The needle-replaceable drain valve according to claim 1, characterized in that: The valve needle limiter is a valve needle sealing cap which is detachably covered on the end of the valve body, and a through hole is formed on the end surface of the valve needle sealing cap for the valve stem and the protrusion to pass through, and at least one point-shaped limiter which radially protrudes toward the inner cavity of the valve body is formed on the inner wall of the through hole.

3. The needle-replaceable drain valve according to claim 2, characterized in that: The valve needle sealing cap is detachably connected to the end of the valve body by means of adhesive connection; or, the valve needle sealing cap is detachably connected to the end of the valve body by means of threaded connection.

4. The needle-replaceable drain valve according to claim 1, characterized in that: A limit member assembly hole is formed on the side wall of the valve body at one end away from the fluid inlet, the valve needle limit member is detachably connected to the limit member assembly hole and the assembly front end of the valve needle limit member extends into the valve body cavity to form a limit portion to block the valve needle protrusion, and the valve needle limit member is a pin or a limit screw.

5. The needle-replaceable drain valve according to claim 1, characterized in that: A mounting groove is formed on the inner wall of one end of the valve body away from the fluid inlet. The valve needle limiter is an annular elastic member, a part of which is embedded and fixed in the mounting groove, and the other part extends toward the center of the cross-section of the inner cavity of the valve body to form an annular limiting portion. The valve needle limiter is a retaining spring or an elastic plastic retaining ring.

6. The needle-replaceable drain valve according to claim 1, characterized in that: The valve stem comprises a rod body with external threads, a sealing portion formed at the front end of the rod body to open or block a fluid channel, and a screwing portion formed at the rear end of the rod body and located outside the valve body.

7. The needle-replaceable drain valve according to claim 1, characterized in that: The valve needle replaceable drain valve further comprises a sealing ring, a bearing step is formed on the inner wall of the valve body, and the sealing ring is pressed tightly between the bearing step and the valve needle protrusion.

8. The needle-replaceable drain valve according to claim 1, characterized in that: A water outlet is formed on the side wall of the valve body, and the water outlet is connected to the fluid channel when the valve needle opens the fluid channel; the valve needle replaceable drain valve also includes a drain nozzle welded or threadedly connected to the water outlet.

9. A water flow distributor, characterized in that: Applied in a refrigeration system, the water flow distributor comprises: a distributor body having a drainage hole; The needle-replaceable drain valve according to any one of claims 1 to 8, wherein the fluid inlet end of the valve body is welded to the distributor body and communicates with the drain hole.

10. The water flow distributor according to claim 9, characterized in that: The water flow distributor also includes a drain valve connecting seat, which is welded to the peripheral wall of the distributor body where the drain hole is located, and a connecting hole is formed on the drain valve connecting seat; the valve body of the drain valve with replaceable valve needle is welded to the connecting hole on the drain valve connecting seat and / or the drain hole on the distributor body.

11. The water flow distributor according to claim 9, characterized in that: The dispenser body comprises: The threaded cylinder is hollow and has connecting threads; A thin-walled body, with both ends open and one end connected to the threaded cylinder, and a drain hole for connecting or communicating with a drain valve with a replaceable valve needle formed on the thin-walled body; A branch pipe connection plate is embedded in the other end of the thin-walled body, the branch pipe connection plate includes at least one panel, and the outer surface of the panel farthest from the threaded cylinder is substantially flat, and each panel is formed with a plurality of branch pipe holes; the branch pipe connection plate, the thin-walled body and the threaded cylinder are all made of stainless steel; A plurality of branch pipes are respectively welded into corresponding branch pipe holes on at least one panel.

12. The water flow distributor according to claim 9, characterized in that: The dispenser body comprises: The body is in the shape of a cylinder with a single open end, the bottom of the body is provided with a plurality of branch pipe holes, and the side wall of the body is formed with a drainage hole for connecting or communicating with a drain valve with a replaceable valve needle; A threaded connection column connected to the open end of the body, or connected to a connection hole on an end plate at the open end of the body; A plurality of branch pipes are respectively welded and connected to a plurality of branch pipe holes at the bottom of the main body.

13. The water flow distributor according to claim 9, characterized in that: The dispenser body comprises: The body is in the shape of a tube with two open ends and one end of which is formed with a connecting thread, and a drainage hole for connecting or communicating with a drain valve with a replaceable valve needle is formed on the side wall of the body; An end cover, which covers the other end of the body and has a plurality of branch pipe holes formed thereon; A plurality of branch pipes are respectively welded and connected to a plurality of branch pipe holes on the end cover.

14. The water flow distributor according to claim 9, characterized in that: The dispenser body comprises: The body is an integrated single-end open structure, the open end of the body is provided with a connecting thread, the other end is in a closed ball head shape and a plurality of branch pipe holes are opened at the ball head, and a drainage hole for connecting or communicating with a replaceable valve needle type drainage valve is formed on the body; A plurality of branch pipes are respectively welded to a plurality of branch pipe holes on the main body.

15. The water flow distributor according to claim 9, characterized in that: The dispenser body comprises: A main pipe having a collecting pipe hole and a plurality of branch pipe holes; A collecting pipe, one end of which is welded to the collecting pipe hole on the main pipe, and the other end is formed with a connecting thread, and a drain hole for connecting or communicating with a drain valve with a replaceable valve needle is formed on the pipe wall of the collecting pipe; A plurality of branch pipes are respectively welded and connected to a plurality of branch pipe holes on the main pipe.

16. The water flow distributor according to claim 9, characterized in that: The dispenser body comprises: The box-type body has a collecting chamber and a diverting chamber which are not connected to each other, and a drainage hole for connecting or communicating with a drain valve with a replaceable valve needle is formed on the side wall of the box-type body where the collecting chamber is located; Two collecting joints are both arranged on the box-type body and are connected to the collecting chamber and the diverting chamber respectively, and each collecting joint is formed with a connecting thread; A plurality of branch pipes are arranged on the box-type body, a part of the branch pipes are connected to the collecting cavity, and another part of the branch pipes are connected to the diverting cavity.

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