KR102718172B1 - Drain reverse current prevention check valve - Google Patents

Abstract

The purpose of the present invention is to provide a drain backflow prevention check valve, and the configuration of the present invention comprises: an outer valve sleeve (120) having a conduit connected to both ends inside; a drain guide sleeve (130) having a drain conduit formed inside through both ends and having a drain connection hole (132) penetrating from an inner circumference to an outer circumference and built into the conduit inside the outer valve sleeve (120); a drain guide disc (140) coupled to the drain conduit inside the drain guide sleeve (130) and having a drain hole (144) penetrating from both ends; a backflow prevention elastic body (150) built into the drain guide sleeve (130) so as to be arranged on the inner surface of the drain guide disc (140); and / a backflow prevention elastic body (150) built into the drain guide sleeve (130) and configured to prevent the drain conduit inside the drain guide sleeve (130) from being damaged by the elasticity of the backflow prevention elastic body (150). It is characterized by including a closing backflow prevention disc (160).

Description

Drain reverse current prevention check valve

The present invention relates to a drain backflow prevention check valve, and more specifically, to a drain backflow prevention check valve that effectively prevents backflow when draining a liquid to be discharged.

In general, a valve is a component that opens and closes the flow of fluid and adjusts the flow rate while controlling the flow rate, flow speed, and pressure of the fluid flowing through the pipe. There are various types depending on the purpose of use, and the most widely used is the stop valve, and there are also check valves, pressure reducing valves, etc.

A check valve is a valve that prevents backflow, and is installed at one point in a pipe to allow fluid to flow in only one direction. This check valve has a structure in which a piston blocks or opens the passage through which the fluid flows, but the piston is operated only by fluid flowing in the forward direction to open the passage.

At this time, it is natural that the check valve as described above should be faithful to the purpose of preventing backflow, but it is necessary to perform the backflow prevention and efficient backflow prevention function through a more simplified structure.

Korean Patent No. 10-2144912 (registered on August 10, 2020) Korean Patent No. 10-1523430 (registered on May 20, 2015) Korean Utility Model Registration No. 20-0478073 (registered on August 19, 2015) Korean Utility Model Registration No. 20-0248048 (registered on September 13, 2001)

The purpose of the present invention is to provide a drain backflow prevention check valve having a simplified structure while efficiently preventing backflow when draining a liquid to be discharged.

According to the present invention for solving the above-mentioned problem, the present invention comprises an outer valve sleeve (120) having a conduit connected to both ends inside, a drain guide sleeve (130) having a drain conduit formed through both ends inside and having a drain connection hole (132) penetrating from an inner circumference to an outer circumference and built into the conduit inside the outer valve sleeve (120), a drain guide disc (140) coupled to the drain conduit inside the drain guide sleeve (130) and having a drain hole (144) penetrating through both ends, a backflow prevention elastic body (150) built into the drain guide sleeve (130) so as to be placed on the inner surface of the drain guide disc (140), and a backflow prevention disc (160) built into the drain guide sleeve (130) and closing the drain conduit inside the drain guide sleeve (130) by the elastic force of the backflow prevention elastic body (150). A drain backflow prevention check valve characterized by this is provided.

The pipe inside the outer valve sleeve (120) is composed of an intermediate pipe (122) in the middle, an inflow-side pipe (124) and an outflow-side pipe (126) connected to the intermediate pipe (122), and pipe bodies are respectively connected to the inflow-side pipe (124) and the outflow-side pipe (126), and the drain guide sleeve (130) is arranged and joined to the intermediate pipe (122), and a backflow prevention step (134) is provided on the inner surface of the drain guide sleeve (130), and the outer surface of the backflow prevention disk (160) is arranged at a position facing the backflow prevention step (134), and a packing joining groove (160PG) is provided on the outer surface of the backflow prevention disk (160), and a backflow prevention packing (161) is seated and joined to the packing joining groove (160PG), and the backflow prevention The packing (161) is configured to sealingly contact the outer surface of the backflow prevention disk (160) and the backflow prevention step (134) inside the drain guide sleeve (130) by the elastic force pushed by the backflow prevention elastic body (150), an elastic body coupling stem (142) is provided at the center of the inner surface of the drain guide disk (140), and the backflow prevention elastic body (150) is configured as a spring and is inserted and coupled to the outer surface of the elastic body coupling stem (142) so as to be arranged between the inner surface of the drain guide disk (140) and the inner surface of the backflow prevention disk (160), and a sealing member (139) is interposed between the inner surface of the outer valve sleeve (120) and the outer surface of the drain guide sleeve (130), so as to seal the inner surface of the outer valve sleeve (120) and the inner surface of the drain guide sleeve (130). It is characterized in that the sealing member (139) is configured to seal.

A packing groove is provided on the inner surface of the inflow-side conduit (124) and the inner surface of the outlet-side conduit (126) inside the outer valve sleeve (120), and a backflow prevention packing (161) is fixedly connected to the packing groove, and the backflow prevention packing (161) is configured to seal between the outer surface of the drain inflow conduit inserted into the inflow-side conduit (124) and the outer surface of the drain outlet conduit inserted into the outlet-side conduit (126), and an elastic body insertion support groove (162) is further provided on the inner surface of the backflow prevention disk (160), and a backflow prevention-side elastic body stem is provided in the elastic body insertion support groove (162), so that when the backflow prevention elastic body (150) is inserted into the outer surface of the elastic body coupling stem (142) at the center of the inner surface of the drain guide disk (140), one end of the backflow prevention elastic body (150) is connected to the drain. It is characterized in that the anti-backflow elastic body (150) is inserted into the elastic body insertion support groove (162) of the anti-backflow disk (160) and is joined to the outer surface of the anti-backflow side elastic body stem, and the other end of the anti-backflow side elastic body is in contact with the inner surface of the anti-backflow disk (160).

In the present invention, when a fluid to be drained flows into the inside of a drain-side drain pipe connected to the drain-side conduit of the outer valve sleeve, which is a main part, the compressed backflow operating elastic body is expanded again by elastic restoring force and is seated in the packing engaging groove of the backflow prevention disc, so that the backflow prevention packing that is engaged sealingly comes into contact with the outer surface of the backflow prevention disc and the backflow prevention step portion inside the drain guide sleeve, thereby having the effect of firmly preventing backflow of the fluid.

In addition, the present invention can also be expected to have the effect of simplifying the configuration of the main part for preventing backflow compared to the conventional one.

Figure 1 is an exploded perspective view of a drain backflow prevention check valve according to the present invention.
Figure 2 is a side view of Figure 1;
Figure 3 is a perspective view of the drain guide sleeve, which is a main part of the present invention.
Figure 4 is a perspective view of the drain guide disc, which is a main part of the present invention.
Figure 5 is a perspective view of a backflow prevention disk, which is a main part of the present invention.
Figure 6 is a perspective view of the drain backflow prevention check valve according to the present invention.
Figure 7 is a cross-sectional view taken along line AA of Figure 6.
Fig. 8 is a cross-sectional view taken along line AA of Fig. 6.
Fig. 9 is a cross-sectional view along the BB line of Fig. 6.
Figure 10 is a cross-sectional view taken along line BB of Figure 6.
Figure 11 is a cross-sectional view showing the structure of a drain backflow prevention check valve according to another embodiment of the present invention.
Fig. 12 is a plan view of part A of Fig. 11;
Fig. 13 is a cross-sectional view showing the structure of a drain backflow prevention check valve according to another embodiment of the present invention.
Figure 14 is a plan view schematically showing the structure of the fixed support piece, which is the main part of part B of Figure 13.
Fig. 15 is an enlarged cross-sectional view of the main part of Fig. 13.
Figure 16 is a cross-sectional view showing the state in which the outer valve sleeve and the drain guide sleeve, which are the main parts of the drain backflow prevention check valve according to another embodiment of the present invention, are combined.
Figure 17 is an enlarged cross-sectional view of the main part of Figure 16.

Hereinafter, with reference to the attached drawings, a preferred embodiment of the present invention will be described in detail. The purpose, features, and advantages of the present invention will be more easily understood by referring to the attached drawings and the following detailed description. In addition, when describing the present invention, if it is judged that a specific description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Also, in describing components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. When it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but another component may also be "connected," "coupled," or "connected" between each component.

In addition, specific structural and functional descriptions in the present invention are merely exemplified for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and should not be construed as being limited to the embodiments described in this specification or application.

FIG. 1 is an exploded perspective view of a drain backflow prevention check valve according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a perspective view of a drain guide sleeve which is a main part of the present invention, FIG. 4 is a perspective view of a drain guide disc which is a main part of the present invention, FIG. 5 is a perspective view of a backflow prevention disc which is a main part of the present invention, FIG. 6 is an external perspective view of a drain backflow prevention check valve according to the present invention, FIG. 7 is a side sectional view taken along line A-A of FIG. 6, FIG. 8 is a front sectional view taken along line A-A of FIG. 6, FIG. 9 is a side sectional view taken along line B-B of FIG. 6, and FIG. 10 is a front sectional view taken along line B-B of FIG. 6.

Referring to the drawings, the present invention is a drain backflow prevention check valve including as a basic configuration an outer valve sleeve (120), a drain guide sleeve (130), a drain guide disc (140), a backflow prevention elastic body (150), and a backflow prevention disc (160).

The above outer valve sleeve (120) has a conduit connected to both ends internally. The outer valve sleeve (120) is configured in a circular tube shape.

The above drain guide sleeve (130) is built into the conduit inside the outer valve sleeve (120). In the present invention, the drain guide sleeve (130) may be configured to be inserted into the conduit inside the outer valve sleeve (120) and maintained in a coupled state by a fixing means such as welding. Alternatively, a screw portion may be provided on the outer surface of the drain guide sleeve (130), and a screw portion may be provided on a portion of the inner surface of the conduit inside the outer valve sleeve (120), so that the drain guide sleeve (130) may be maintained in a coupled state to the conduit inside the outer valve sleeve (120) by the coupling of the screw portions. The drain guide sleeve (130) is formed with a drain conduit extending through both ends therein. In addition, the drain guide sleeve (130) is provided with a drain connection hole (132) extending from the inner surface to the outer surface. The drain connection hole (132) is configured as a hole extending to a certain depth from the outlet end of the drain guide sleeve (130) toward the inlet end. The drain connection hole (132) is configured as a hole that penetrates from the outlet of the drain guide sleeve (130) to the front position of the backflow prevention step (134) on the inner surface of the drain guide sleeve (130). At least two drain connection holes (132) are provided in a radial direction based on the center of the drain guide sleeve (130). The drain guide sleeve (130) is configured in a circular tube shape and is built into and fixed in a conduit inside the outer valve sleeve (120).

The above drain guide disc (140) is coupled to the drain pipe inside the drain guide sleeve (130). The drain guide disc (140) has a structure in which a peripheral portion is inserted into a coupling support clamping groove (212) formed at a certain depth from the outlet end of the drain guide sleeve (130) toward the inlet end, and is coupled to the drain pipe inside the drain guide sleeve (130).

The above drain guide disc (140) has a drain hole (144) penetrating through both sides. In the present invention, the drain guide disc (140) has a structure having four drain holes (144) based on the center.

The above drain guide disc (140) is configured in a circular shape and has four drain holes (144) based on the center.

The above-mentioned backflow prevention elastic body (150) is built into the drain guide sleeve (130). The structure is such that the backflow prevention elastic body (150) is built into the drain guide sleeve (130) so as to be placed on the inner surface of the drain guide disk (140).

The above-mentioned backflow prevention disk (160) is built into the drain guide sleeve (130). The backflow prevention disk (160) is configured to close the drain pipe inside the drain guide sleeve (130) by the elastic force of the backflow prevention elastic body (150). The above-mentioned backflow prevention disk (160) is configured in a disc shape.

The pipe inside the outer valve sleeve (120) is composed of a middle pipe (122) in the middle, an inlet-side pipe (124) and an outlet-side pipe (126) connected to the middle pipe (122).

A pipe is connected to each of the inflow-side pipe (124) and the outflow-side pipe (126). The pipe connected to the inflow-side pipe (124) can be called an inflow-side drain pipe, and the pipe connected to the outflow-side pipe (126) can be called an outflow-side drain pipe.

The drain guide sleeve (130) is placed and connected to the above intermediate pipe (122).

A backflow prevention step (134) is provided on the inner surface of the above drain guide sleeve (130). Since the drain guide sleeve (130) has a circular tube shape, the backflow prevention step (134) is configured in a circular closed loop step shape.

The outer surface of the above-described backflow prevention disk (160) is positioned so as to face the backflow prevention step (134) inside the above-described drain guide sleeve (130), and a packing joining groove (160PG) is provided on the outer surface of the above-described backflow prevention disk (160), and a backflow prevention packing (161) is seated and joined in the packing joining groove (160PG).

The backflow prevention packing (161) that is seated and connected to the packing joining groove (160PG) of the backflow prevention disk (160) is configured to sealingly contact the outer surface of the backflow prevention disk (160) and the backflow prevention step (134) inside the drain guide sleeve (130) by the elastic force pushed by the backflow prevention elastic body (150). When this state is achieved, the backflow of the fluid can be firmly prevented.

A backflow prevention side elastic stem protrudes from the center of the inner surface of the above backflow prevention disk (160), and the backflow prevention side elastic stem has a structure in which the drain guide disk (140) is slidably connected to the inside of a tubular elastic body coupling stem (142) protruding from the inner surface.

An elastic body coupling stem (142) is provided at the center of the inner surface of the drain guide disc (140), and the backflow prevention elastic body (150) is configured as a spring and is inserted and coupled to the outer surface of the elastic body coupling stem (142) so as to be arranged between the inner surface of the drain guide disc (140) and the inner surface of the backflow prevention disc (160).

A sealing member (139) is interposed between the inner surface of the outer valve sleeve (120) and the outer surface of the drain guide sleeve (130), so that the sealing member (139) seals the space between the inner surface of the outer valve sleeve (120) and the inner surface of the drain guide sleeve (130).

The above sealing member (139) prevents the fluid from flowing back into the gap between the inner surface of the outer valve sleeve (120) and the outer surface of the drain guide sleeve (130).

A packing groove is provided on the inner surface of the inflow-side conduit (124) and the inner surface of the outlet-side conduit (126) inside the outer valve sleeve (120), and a packing (128) is fixedly joined to the packing groove, and the packing (128) is configured to seal the space between the outer surface of the drain inflow conduit inserted into the inflow-side conduit (124) and the outer surface of the drain outlet conduit inserted into the outlet-side conduit (126).

The above packings (128) prevent the fluid from flowing backwards between the outer valve sleeve (120) and the drain inlet pipe and the drain outlet pipe, and also prevent fluid leakage.

The inner surface of the backflow prevention disk (160) is further provided with an elastic insertion support groove (162), and a backflow prevention-side elastic stem is provided in the elastic insertion support groove (162), so that when the backflow prevention elastic body (150) is inserted into the outer surface of the elastic body joining stem (142) at the center of the inner surface of the drain guide disk (140), one end of the backflow prevention elastic body (150) comes into contact with the inner surface of the drain guide disk (140), the backflow prevention elastic body (150) is inserted into the elastic body insertion support groove (162) of the backflow prevention disk (160) and is coupled to the outer surface of the backflow prevention-side elastic body stem, and the other end of the backflow prevention-side elastic body comes into contact with the inner surface of the backflow prevention disk (160).

In this way, when one end of the backflow prevention elastic body (150) is in contact with the inner surface of the drain guide disc (140), and the backflow prevention elastic body (150) is inserted into the elastic body insertion support groove (162) of the backflow prevention disc (160) and is coupled to the outer surface of the backflow prevention-side elastic body stem, and the other end of the backflow prevention-side elastic body is in contact with the inner surface of the backflow prevention disc (160), the backflow prevention elastic body (150) stably performs an expansion and contraction operation without displacement, and as a result, the backflow prevention packing (161) that is seated and coupled to the packing coupling groove (160PG) of the backflow prevention disc (160) sealingly contacts the outer surface of the backflow prevention disc (160) and the backflow prevention step (134) inside the drain guide sleeve (130) without displacement, the backflow of the fluid can be prevented more precisely and sturdily. It works.

According to the present invention having the above-described configuration, when a fluid for draining flows into the inflow-side drain pipe connected to the inflow-side conduit (124) of the outer valve sleeve (120), the backflow prevention disk (160) is pushed by the fluid, thereby compressing the backflow operating elastic body, and the inside of the inflow-side drain pipe, the drain hole (144) of the drain guide sleeve (130), and the inside of the outflow-side drain pipe connected to the outflow-side conduit (126) of the outer valve sleeve (120) are connected, so that the fluid can be drained.

Meanwhile, when the fluid to be drained flows into the drain-side drain pipe connected to the drain-side conduit (126) of the outer valve sleeve (120), which is the main part, the compressed backflow operating elastic body is expanded again by the elastic restoring force, and the backflow prevention packing (161) that is seated and connected to the packing joining groove (160PG) of the backflow prevention disk (160) sealingly comes into contact with the outer surface of the backflow prevention disk (160) and the backflow prevention step (134) inside the drain guide sleeve (130), thereby firmly preventing the backflow of the fluid. When the fluid is about to flow backwards toward the inflow-side drain pipe inside the outflow-side drain pipe connected to the outflow-side conduit (126) of the outer valve sleeve (120), which is the main part, the backflow prevention disk (160) is pushed by the fluid, and the backflow prevention packing (161) provided on the backflow prevention disk (160) is pressurized and sealed against the inflow-side step provided inside the drain guide pipe, thereby blocking the backflow passage, thereby more reliably preventing the fluid from flowing backwards.

Therefore, the present invention has the effect of efficiently preventing the backflow phenomenon of the fluid during the draining process of the fluid, and has the effect of highly reliable backflow prevention.

Meanwhile, FIG. 11 is a cross-sectional view showing the structure of a drain backflow prevention check valve according to another embodiment of the present invention, FIG. 12 is a plan view of portion A of FIG. 11, FIG. 13 is a cross-sectional view showing the structure of a drain backflow prevention check valve according to another embodiment of the present invention, FIG. 14 is a plan view schematically showing the structure of a fixed support piece, which is a main part of portion B of FIG. 13, FIG. 15 is an enlarged cross-sectional view of the main part of FIG. 13, FIG. 16 is a cross-sectional view showing a state in which an outer valve sleeve and a drain guide sleeve, which are main parts of a drain backflow prevention check valve according to another embodiment of the present invention, are combined, and FIG. 17 is an enlarged cross-sectional view of the main part of FIG. 16.

The present invention further includes an auxiliary backflow prevention body (170) provided inside the outlet-side conduit (126) of the outer valve sleeve (120), and the auxiliary backflow prevention body (170) further includes an auxiliary coupling support ring body (172) coupled to the inner surface of the outlet-side conduit of the outer valve sleeve (120), and at least two auxiliary backflow prevention seats (174) having base ends coupled to the auxiliary coupling support ring body (172), and the two or more auxiliary backflow prevention seats (174) are characterized in that they are configured to form a backflow prevention overlapping portion (175) in which front ends overlap each other.

The auxiliary coupling support ring (172) may be configured such that the screw portion of the outer surface is coupled to the screw portion formed on the inner surface of the outlet-side conduit (126) of the outer valve sleeve (120), so that the auxiliary coupling support ring (172) can be detachably coupled to the outlet-side conduit of the outer valve sleeve (120).

One side of the base end of the auxiliary backflow prevention sheet (174) may be fixed to one side of the auxiliary coupling support ring body (172) by an attachment means such as a bolt or adhesive, so that at least two auxiliary backflow prevention sheets (174) are coupled to the auxiliary coupling support ring body (172).

The above auxiliary backflow prevention sheet (174) is made of an elastic material such as rubber, and can be configured so that when no force is applied to the auxiliary backflow prevention sheet (174), the auxiliary backflow prevention sheet (174) can be spread out again to its original position.

According to the present invention, when the fluid is drained in the forward direction, that is, when the inside of the inflow-side drain pipe connected to the inflow-side conduit (124) of the outer valve sleeve (120) and the inside of the outflow-side drain pipe connected to the drain hole (144) of the drain guide sleeve (130) and the outflow-side conduit (126) of the outer valve sleeve (120) are in communication and the fluid is drained, two or more of the auxiliary backflow prevention seats (174) are spread apart by the pressure or weight of the drain fluid to form a drain passage, thereby allowing the fluid to be drained smoothly.

Meanwhile, when the fluid to be drained flows into the drain-side drain pipe connected to the drain-side conduit (126) of the outer valve sleeve (120), two or more auxiliary backflow prevention seats (174) are spread back to their original positions by their own elastic force, and the overlapping portions (175) in which some of the leading ends overlap each other are pressed against each other, and two or more auxiliary backflow seats are pressed against the outer surface of the drain guide disc (140) to block the backflow passage, so that when the fluid is not drained in the forward direction, in other words, when the fluid is about to flow backward from the inside of the drain-side drain pipe connected to the drain-side conduit (126) of the outer valve sleeve (120) toward the inlet-side drain pipe, two or more auxiliary backflow seats prevent the backflow of the fluid once more.

Therefore, the present invention has the effect of preventing the backflow of fluid more reliably because when the backflow to be drained is about to flow in the reverse direction, the overlapping portions (175) of two or more auxiliary backflow prevention sheets (174) are pressed against each other and pressed against the outer surface of the drain guide disc (140) to block the backflow passage once more. In other words, the present invention has the effect of further increasing the reliability in preventing the backflow of fluid because the backflow of fluid is double-prevented by the auxiliary backflow prevention body (170).

In addition, the present invention comprises at least two or more bolt-joining holes (183) formed to enter a certain depth from the outer surface of the outer valve sleeve (120) toward the inner surface, a fixed support bolt (204) coupled to the bolt-joining holes (183), a pin exit hole (184) penetrating from the tip of the bolt-joining hole (183) to the inner surface of the outer valve sleeve (120), at least two or more fixed support pieces (192) accommodated in the bolt-joining holes (183) and moving forward toward the center of the outer valve sleeve (120) or moving backward so as to spread out from the center of the outer valve sleeve (120), a coupling support pin (194) protruding from the outer surface of the fixed support piece (192) and operating to emerge from the pin exit hole (184), and an elastic coupling pin (192EP) formed at the inner end of the fixed support piece (192) and coupled to the fixed support piece (192). It is characterized by further including a fixed support elastic body (202) interposed between the outer surface and the inner end of the fixed support bolt (204), and at least two or more combined support clamping grooves (212) provided on the outer surface of the drain guide sleeve (130) and into which the combined support pin (194) is inserted and caught.

The above fixed support member (192) is movably coupled to the bolt joint hole (183) of the outer valve sleeve (120), and the coupling support pin (194) is movably coupled to the pin exit hole (184) of the outer valve sleeve (120).

When the drain guide sleeve (130) is pushed into the middle conduit (122) inside the outer valve sleeve (120), the fixed support piece (192) and the coupling support pin (194) are pushed apart from the longitudinal center line of the outer valve sleeve (120), and the fixed support elastic body (202) is compressed, and when the coupling support clamping groove (212) on the outer surface of the drain guide sleeve (130) reaches a position where it meets the coupling support pin (194) at the tip of the fixed support piece (192), the fixed support piece (192) and the coupling support pin (194) are moved back to the original position by the elastic force of the fixed support elastic body (202) that was compressed, and are inserted into the coupling support clamping groove (212) of the drain guide sleeve (130), so that the drain guide sleeve (130) can be coupled to the inside of the outer valve sleeve (120) in a one-touch manner.

Therefore, the present invention has the effect of being able to be easily and quickly combined by pushing the drain guide sleeve (130) into the inside of the outer valve sleeve (120).

At this time, when the fixed support bolt (204) is tightened in the bolt joint hole (183) of the outer valve sleeve (120) and advanced toward the drain guide sleeve (130), the coupling support pin (194) of the fixed support piece (192) can be more firmly coupled to the coupling support clamping groove (212) on the outer surface of the drain guide sleeve (130).

It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that various modifications and variations can be made without changing the gist of the present invention.

Accordingly, the embodiments described above are provided to fully inform a person skilled in the art of the scope of the invention to which the present invention belongs, and therefore should be understood to be exemplary and not restrictive in all respects, and the present invention is defined only by the scope of the claims.

120. Outer valve sleeve 122. Middle conduit
124. Inlet side pipe 126. Outlet side pipe
128. Packing 130. Drain Guide Sleeve
132. Drain connection hole 134. Backflow prevention step
139. Sealing member 140. Drain guide disc
142. Elastic joint stem 144. Drain hole
150. Anti-backflow elastic body 160. Anti-backflow disk
160PG. Packing joint home 161. Anti-backflow packing
162. Elastic insertion support groove 170. Auxiliary backflow prevention body
172. Auxiliary joint support ring 174. Auxiliary backflow prevention sheet
175. Overlap 183. Bolt joint hole
184. Pin insertion hole 192. Fixed support piece
194. Joint support pin 202. Fixed support elastic body
204. Fixed support bolt 212. Joint support clamping groove

Claims (3)

An outer valve sleeve (120) having a conduit connected to both ends inside,
A drain pipe is formed through both ends inside, and a drain connection hole (132) is provided through the inner surface to the outer surface, and a drain guide sleeve (130) is built into the pipe inside the outer valve sleeve (120).
A drain guide disc (140) coupled to the drain pipe inside the drain guide sleeve (130) and having a drain hole (144) penetrating through both sides,
A backflow prevention elastic body (150) built into the drain guide sleeve (130) so as to be placed on the inner surface of the drain guide disc (140),
It includes a backflow prevention disk (160) built into the drain guide sleeve (130) and closing the drain pipe inside the drain guide sleeve (130) by the elastic force of the backflow prevention elastic body (150).
The pipe inside the outer valve sleeve (120) is composed of an intermediate pipe (122) in the middle, an inlet-side pipe (124) and an outlet-side pipe (126) connected to the intermediate pipe (122), and a pipe body is connected to each of the inlet-side pipe (124) and the outlet-side pipe (126).
The drain guide sleeve (130) is placed and connected to the above intermediate pipe (122),
A backflow prevention step (134) is provided on the inner surface of the drain guide sleeve (130), and the outer surface of the backflow prevention disk (160) is positioned so as to face the backflow prevention step (134), a packing joining groove (160PG) is provided on the outer surface of the backflow prevention disk (160), and a backflow prevention packing (161) is seated and joined in the packing joining groove (160PG), and the backflow prevention packing (161) is configured to sealingly contact the outer surface of the backflow prevention disk (160) and the backflow prevention step (134) inside the drain guide sleeve (130) by the elastic force pushed by the backflow prevention elastic body (150).
An elastic body coupling stem (142) is provided at the center of the inner surface of the drain guide disc (140), and the backflow prevention elastic body (150) is configured as a spring and is inserted and coupled to the outer surface of the elastic body coupling stem (142) so as to be arranged between the inner surface of the drain guide disc (140) and the inner surface of the backflow prevention disc (160).
A sealing member (139) is interposed between the inner surface of the outer valve sleeve (120) and the outer surface of the drain guide sleeve (130), so that the sealing member (139) seals the space between the inner surface of the outer valve sleeve (120) and the inner surface of the drain guide sleeve (130).
At least two or more bolt-joining holes (183) formed to enter a certain depth from the outer surface to the inner surface of the outer valve sleeve (120), a fixed support bolt (204) coupled to the bolt-joining holes (183), a pin exit hole (184) penetrating from the tip of the bolt-joining hole (183) to the inner surface of the outer valve sleeve (120), at least two or more fixed support pieces (192) accommodated in the bolt-joining holes (183) and advancing toward the center of the outer valve sleeve (120) or moving backwards so as to spread out from the center of the outer valve sleeve (120), a coupling support pin (194) protruding from the outer surface of the fixed support piece (192) and operating to emerge into the pin exit hole (184), and an elastic coupling pin (192EP) formed at the inner end of the fixed support piece (192) and coupled to the outer surface of the fixed support piece (192) and It further includes a fixed support elastic body (202) interposed between the inner ends of the fixed support bolt (204) and at least two or more combined support clamping grooves (212) provided on the outer surface of the drain guide sleeve (130) into which the combined support pin (194) is inserted and caught.
A drain backflow prevention check valve characterized in that the fixed support member (192) is movably coupled to the bolt joint hole (183) of the outer valve sleeve (120), and the joint support pin (194) is movably coupled to the pin exit hole (184) of the outer valve sleeve (120).
delete In the first paragraph,
A packing groove is provided on the inner surface of the inflow-side conduit (124) and the inner surface of the outlet-side conduit (126) inside the outer valve sleeve (120), and a backflow prevention packing (161) is fixedly connected to the packing groove, and the backflow prevention packing (161) is configured to seal the space between the outer surface of the drain inflow pipe inserted into the inflow-side conduit (124) and the outer surface of the drain outlet pipe inserted into the outlet-side conduit (126).
A drain backflow prevention check valve, characterized in that an elastic insertion support groove (162) is further provided on the inner surface of the backflow prevention disk (160), and a backflow prevention-side elastic stem is provided in the elastic insertion support groove (162), so that when the backflow prevention elastic body (150) is inserted into the outer circumferential surface of the elastic body joining stem (142) at the center of the inner surface of the drain guide disk (140), one end of the backflow prevention elastic body (150) comes into contact with the inner surface of the drain guide disk (140), the backflow prevention elastic body (150) is inserted into the elastic body insertion support groove (162) of the backflow prevention disk (160) and is coupled to the outer circumferential surface of the backflow prevention-side elastic body stem, and the other end of the backflow prevention-side elastic body comes into contact with the inner surface of the backflow prevention disk (160).

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