Spring pressing type drain valve

Abstract

The utility model discloses a spring pressing type drain valve, and belongs to the technical field of drain valves. Comprising an outer cylinder, an inner drainage cylinder, spring stand columns and a cover plate. The upper and lower ends of the outer cylinder and the inner drainage cylinder are of opening structures; the outer cylinder is arranged on a water outlet of the dish washing tank; the inner drainage cylinder is detachably arranged in the outer cylinder; a spring stand column is arranged in the middle of the inner drainage cylinder; cover plates are arranged at the lower ends of the spring columns; the cover plate is positioned below the lower end openings of the outer cylinder and the inner drainage cylinder; and an opening in the upper end of the inner drainage cylinder is fixedly connected with the spring stand column through a connecting structure. The spring pressing type drain valve solves the problem that kitchen garbage is easy to stick and hang on a connecting rod or a water filtering basket in an existing spring pressing type drain valve and is difficult to clean.

Description

Technical Field

[0001] The utility model belongs to the technical field of drain valves, and in particular relates to a spring-pressed drain valve. Background Art

[0002] The sink is an essential kitchen appliance. It's used for washing fruits, vegetables, and dishes. It typically has a drain at the bottom. During the washing process, you can choose to open the drain for continuous water flow, or you can seal the drain and allow fresh water to collect in the sink before rinsing. The sink's outlet is equipped with a drain valve. The most primitive drain valve was simply a plug, inserted directly into the drain outlet to drain water. However, this plug-type drain valve is difficult to remove due to water pressure, and because it's separated from the sink, it can be easily lost. Currently, a spring-loaded drain valve is more commonly used. This valve is installed directly on the drain outlet. Pressing the spring closes the valve, and the spring rebounds, opening it.

[0003] Existing spring-loaded drain valves primarily consist of a spring column and a sealing cover plate. The sealing cover plate is positioned above the spring column and is pressed downward to seal the valve. To secure the spring column to the sink's drain outlet, a connecting rod or filter basket is installed between the spring column and the outlet. Wastewater after cleaning may contain kitchen waste, such as vegetable leaves. This waste can become lodged in the connecting rod or filter basket during drainage, preventing it from being discharged. This lodged waste is then trapped inside the drain valve, making it difficult to remove. Utility Model Content

[0004] The utility model provides a spring-pressed drain valve, which includes an outer cylinder with a lower drain outlet provided below the outer cylinder; the outer cylinder and the lower drain outlet are installed at the drain outlet of the sink; an inner drain cylinder is detachably provided inside the outer cylinder, a spring column is centrally provided inside the inner drain cylinder, and a cover plate is provided below the spring column; the cover plate is located below the lower drain outlet; the spring column is connected to the upper opening of the inner drain cylinder; the outer cylinder, the lower drain outlet, and the interior of the inner drain cylinder do not have any connecting rods or filter structures; kitchen waste mixed in the wastewater can be discharged along with the wastewater, and will not stick to the interior, making it inconvenient to clean. The kitchen waste stuck to the connection structure between the upper opening of the inner drain cylinder and the spring column can be easily removed and cleaned. The utility model solves the problem that the connecting rod or filter basket inside the current spring-pressed drain valve is easily stuck to kitchen waste, making it difficult to clean.

[0005] In order to achieve the above technical objectives, the present invention is implemented through the following technical solutions:

[0006] A spring-pressed drain valve comprises an outer cylinder, an inner drain cylinder, a spring column and a cover plate;

[0007] The upper and lower ends of the outer cylinder and the inner drainage cylinder are both open structures;

[0008] The outer cylinder is arranged on the drain outlet of the sink;

[0009] The inner drainage cylinder is detachably arranged inside the outer cylinder;

[0010] A spring column is centrally arranged in the inner drainage cylinder;

[0011] A cover plate is provided at the lower end of the spring column;

[0012] The cover plate is located below the lower end openings of the outer cylinder and the inner drainage cylinder;

[0013] The upper opening of the inner drainage cylinder is connected and fixed to the spring column through a connecting structure.

[0014] Preferably, a lower drain outlet is provided at the lower opening of the outer cylinder;

[0015] The inner and outer diameters of the lower drain outlet are smaller than the inner and outer diameters of the outer cylinder;

[0016] The cover plate is located below the lower end opening of the lower drain outlet; the outer diameter of the cover plate is equal to the outer diameter of the lower drain outlet.

[0017] Screws or screw holes can be provided on the lower drain outlet; the outer cylinder is mounted on the drain outlet of the sink by using the screws.

[0018] Preferably, a limiting support step is symmetrically provided on the inner side wall close to the lower end opening of the outer cylinder;

[0019] When the inner drainage cylinder is placed in the outer cylinder, the lower opening edge of the inner drainage cylinder is exactly located on the limiting support step.

[0020] Due to the existence of the limiting support step, the inner drainage cylinder will not fall into the outer cylinder.

[0021] Preferably, a socket is provided in the position-limiting support step;

[0022] Attached blocks are symmetrically arranged on the edge of the lower opening of the inner drainage cylinder; and inserted columns are arranged below the attached blocks;

[0023] When the inner drainage cylinder is placed in the outer cylinder, the insertion column is inserted into the insertion hole.

[0024] The insertion holes and the insertion columns form a mortise and tenon structure, which makes it more stable for the inner drainage cylinder to be placed in the outer cylinder.

[0025] Preferably, when the inner drainage cylinder is placed in the outer cylinder, the outer wall of the inner drainage cylinder fits in with the inner wall of the outer cylinder;

[0026] The upper opening edge of the inner drainage cylinder is flush with the upper opening edge of the outer cylinder.

[0027] Preferably, the connection structure between the upper opening edge of the inner drainage cylinder and the spring column is provided with two thin connecting rods;

[0028] The two thin connecting rods are arranged in a mirror-symmetrical manner.

[0029] Preferably, the connection structure is configured as a filter covering the area between the upper opening edge of the inner drainage cylinder and the spring column.

[0030] Preferably, the outer diameter of the cover plate is smaller than the inner diameter of the lower drain outlet;

[0031] The upper edge of the cover plate is provided with a cover plate side edge;

[0032] The outer diameter of the cover plate and the side edge of the cover plate is greater than the inner diameter of the lower drain outlet.

[0033] Preferably, the spring column comprises: a spring column housing, a spring column core rod, a spring and a limiting clamping rod;

[0034] The spring column housing has through holes centrally provided on both upper and lower end surfaces;

[0035] A spring column core rod is movably arranged in the spring column housing;

[0036] The spring column core rod can just pass through the through holes on the upper and lower end surfaces of the spring column shell;

[0037] A spring is sleeved on the outer periphery of the lower portion of the spring column core rod; there is no contact between the spring and the spring column core rod;

[0038] The lower end of the spring is arranged on the inner bottom surface of the spring column housing, and the upper end of the spring contacts the lower part of the lower pressing block arranged on the spring column core rod;

[0039] Two limiting clamping rods are symmetrically arranged on the side wall of the spring column core rod above the lower pressing block;

[0040] One end of the position-limiting clamping rod away from the core rod of the spring column is movably embedded in a groove provided on the inner wall of the spring column shell.

[0041] Preferably, the position-limiting clamping rod comprises a long vertical rod and two short horizontal rods;

[0042] The two short horizontal bars are vertically connected to the upper and lower ends of the long vertical bar respectively;

[0043] The short cross bar located at the top faces the spring column core rod and is connected to the spring column core rod;

[0044] The short cross bar located at the bottom faces the spring column shell and is movably embedded in a groove provided on the inner wall of the spring column shell.

[0045] Preferably, the groove is a V-shaped structure, and the bottom of the V-shaped groove is a horizontal transition groove portion;

[0046] An arc-shaped groove opening is arranged above the horizontal transition groove.

[0047] The beneficial effects of the utility model are:

[0048] The utility model provides a spring-pressed drain valve, in which an outer cylinder and a lower drain outlet are integrally mounted on the drain outlet of the sink; the outer cylinder and the lower drain outlet are in communication without any additional connecting structure; an inner drain valve is placed in the outer cylinder, and the inner drain cylinder is in communication with the outer cylinder and the lower drain outlet, also without any additional connecting structure; a spring column is provided in the inner drain cylinder, and a connecting rod between the spring column and the inner drain cylinder is located at the upper end opening of the inner drain cylinder; a cover plate provided below the spring column is located below the lower drain outlet; the lower drain outlet can be blocked or opened by means of the spring column, thereby achieving drainage; during the drainage process, there is no additional structure in the outer cylinder, the inner drain cylinder and the lower drain outlet that may cause vegetable leaves to stick, so that vegetable leaves in the wastewater can be discharged together with the wastewater, thus avoiding blockage and reducing the difficulty of later cleaning;

[0049] Since the connecting structure between the spring column and the inner drainage cylinder is located at the upper opening of the inner drainage cylinder, even if some vegetable leaves are stuck on the connecting structure, it is easy to remove and discard them; unlike the existing technology, the vegetable leaves will not stick to the inside of the drain valve with the wastewater, making it difficult to clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 It is a schematic diagram of the overall external structure of the utility model;

[0052] Figure 2 This is a schematic diagram of the external structure of the outer cylinder and the small drain outlet of the utility model;

[0053] Figure 3 This is a schematic diagram of the structure of the limiting support step provided on the inner wall of the outer cylinder of the utility model;

[0054] Figure 4 This is a schematic diagram of the structure of the inner drainage cylinder, spring column and cover plate of the utility model; specifically, it is a schematic diagram of the structure of the cover plate in the depressed state;

[0055] Figure 5 This is a schematic diagram of the structure of the inner drainage cylinder, spring column and cover plate of the utility model; specifically, it is a schematic diagram of the structure of the cover plate in the rebound state;

[0056] Figure 6 This is a structural diagram of the cover plate edge provided on the upper edge of the cover plate of the present invention;

[0057] Figure 7 This is a structural diagram of the utility model in which the cover plate is separated from the lower drain outlet and is ready for drainage;

[0058] Figure 8 This is a structural diagram of the utility model in which the cover plate closes the lower drain outlet and the drain is not allowed to flow;

[0059] Figure 9 This is a schematic diagram of the spring column structure of the utility model;

[0060] Figure 10 This is a schematic diagram of the groove structure provided on the inner wall of the spring column housing of the utility model;

[0061] Figure 11 This is a schematic diagram of the structure of the utility model in which a socket is provided on the position-limiting support step;

[0062] Figure 12 This is a structural diagram of the utility model in which an attachment block is provided at the edge of the lower opening of the inner drainage cylinder, and a plug column is provided below the attachment block;

[0063] In the accompanying drawings, the structural names represented by the reference numerals are:

[0064] 1-outer cylinder, 101-limit support step, 1011-socket, 2-lower drain outlet, 3-inner drain cylinder, 301-connecting structure, 302-attached block, 303-inserted column, 4-spring column, 401-spring column shell, 4011-groove, 4012-horizontal transition groove, 4013-arc-shaped groove mouth, 402-spring column core rod, 403-spring, 404-lower pressure block, 405-limited clamping rod, 5-cover plate, 501-cover plate side edge. DETAILED DESCRIPTION

[0065] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0066] Example 1

[0067] A spring-pressed drain valve comprises an outer cylinder 1, an inner drain cylinder 3, a spring column 4 and a cover plate 5;

[0068] like Figure 2 As shown, the outer tube 1 is a cylindrical structure with a hollow interior and openings at both ends. A lower drain outlet 2 is provided at the lower end of the outer tube 1. The lower drain outlet 2 is also a cylindrical structure with a hollow interior and openings at both ends. The upper end opening of the lower drain outlet 2 communicates with the lower end opening of the outer tube 1. The inner and outer diameters of the lower drain outlet 2 are both smaller than those of the outer tube 1.

[0069] The outer tube 1 and the lower drain outlet 2 are installed on the drain outlet at the bottom of the sink. Some sinks have a pipe extending from the bottom of the drain outlet. When installing, insert the outer tube 1 and the lower drain outlet 2 into the pipe from the drain outlet, and then drive screws into the pipe wall to fix the outer tube 1 and the lower drain outlet 2. If there is no pipe under the drain outlet of the sink, such as Figure 2 As shown, a circle of extended hanging ears is set on the edge of the upper opening of the outer cylinder 1. After the outer cylinder 1 and the lower drain outlet 2 are placed in the drain outlet of the sink, screws are used to pass through the hanging ears and the bottom surface of the sink to achieve fixation.

[0070] like Figure 4 As shown, the inner drain cylinder 3 is also a cylindrical structure with an open structure at both ends; a spring column 4 is vertically arranged in the center of the inner drain cylinder 3, and the lower end of the spring column 4 extends out of the lower end opening of the inner drain cylinder 3 and is connected to a cover plate 5; the structure adopted by the spring column 4 can be the spring column structure adopted in the current spring press type drain valve. In order for the spring column 4 to work properly, there must be a connection structure between it and the inner drain cylinder 3. The connection structure 301 between the spring column 4 and the inner drain cylinder 3 is set at the upper end opening of the inner drain cylinder 3; the specific structure is set as two connecting rods, and the two connecting rods are set in a mirror symmetrical manner. The ends of the two connecting rods close to the spring column 4 are connected to the side wall of the spring column 4, and the ends of the two connecting rods away from the spring column 4 are connected to the edge of the upper end opening of the inner drain cylinder 3.

[0071] The whole composed of inner drainage cylinder 3, spring column 4 and cover plate 5 should be installed in outer cylinder 1 before it can be used normally. Figure 8As shown, the inner drainage cylinder 3 is installed inside the outer cylinder 1, and the lower end of the spring column 4 extends all the way to the lower opening of the lower drain outlet 2; when the inner drainage cylinder 3 is installed in the outer cylinder 1, the outer wall of the inner drainage cylinder 3 fits together with the inner wall of the outer cylinder 1; a limiting support step 101 is stacked on the inner side wall of the lower opening of the outer cylinder 1, and when the inner drainage cylinder 3 is placed in the outer cylinder 1, the edge of the lower opening of the inner drainage cylinder 3 contacts two symmetrically arranged limiting support steps 101; due to the supporting effect of the limiting support steps 101, the upper opening of the inner drainage cylinder 3 is flush with the upper opening of the outer cylinder 1, and the inner drainage cylinder 3 will not fall into the outer cylinder 1.

[0072] like Figure 8 As shown, when the spring inside the spring column 4 is not compressed, the lower end of the spring column 4 should be flush with the lower opening of the lower drain outlet 2. At this time, the cover plate 5 connected to the lower end of the spring column 4 can just touch the lower opening of the lower drain outlet 2; the outer diameter of the cover plate 5 should be equal to or larger than the outer diameter of the lower drain outlet 2; in this way, the cover plate 5 can just cover the lower drain outlet 2, and the drain valve is in the closed state.

[0073] like Figure 7 As shown, when the spring column 4 is pressed down, the internal spring is compressed; the spring column 4 will drive the cover plate 5 to pop down, and at this time the cover plate 5 is separated from the lower end opening of the lower drain outlet 2. The waste water in the sink will enter the inner drain cylinder 3 from the upper end opening of the inner drain cylinder 3, and then reach the connection between the outer cylinder 1 and the lower drain outlet 2, and then reach the lower drain outlet 2, and be discharged from the lower end opening of the lower drain outlet 2.

[0074] Depend on Figure 7 or Figure 8 The drainage channel formed by the inner drain cylinder 3, outer cylinder 1, and lower drain outlet 2 has no other transverse structures except for the vertical spring columns 4. This prevents any vegetable waste, such as leaves, from getting stuck in the drain and instead drains away with the wastewater. If leaves get stuck in the drain valve, cleaning them can be difficult and may require disassembly. If left unchecked, the accumulated waste can cause a blockage.

[0075] The two horizontal connecting rods of the entire drain valve device are also located at the upper end opening of the inner drain cylinder 3. When installed on the sink, it is equivalent to being on the plane where the lower bottom surface of the sink is located; even if some vegetable leaves are stuck on it, they can be removed and discarded by hand, which is easy to clean.

[0076] As a preferred embodiment, the connection between the inner drain cylinder 3 and the spring column 4 can be designed not only as two symmetrical connecting rods, but also through a filter screen. This is equivalent to covering the area between the upper opening edge of the inner drain cylinder 3 and the spring column 4 with a filter screen attached to the upper opening edge of the inner drain cylinder 3 and the spring column 4, respectively. This prevents impurities and food waste from being discharged into the wastewater due to the filter screen, allowing it to be directly cleaned in the sink. Any fine particles that pass through the filter screen can be discharged along with the wastewater. This also prevents food waste such as vegetable leaves from getting stuck inside the drain valve, making it difficult to clean.

[0077] Example 2

[0078] Based on Example 1, in Example 1, in order for the cover plate 5 to cover and obstruct the lower end opening of the lower drain outlet 2, the outer diameter of the cover plate 5 must be designed to be at least equal to the outer diameter of the lower drain outlet 2. However, the obstacle to removing the inner drain cylinder 3 from the outer cylinder 1 lies at the cover plate 5. Since the cover plate 5 abuts against the edge of the lower drain outlet 2, the inner drain cylinder 3 cannot be removed from the outer cylinder 1. When the inner drain cylinder 3 needs to be replaced or removed for cleaning, it will be impossible to remove it.

[0079] like Figure 6 As shown, in this embodiment, the outer diameter of the cover plate 5 is reduced so that the outer diameter of the cover plate 5 is smaller than the inner diameter of the lower drain outlet 2; at the same time, a cover plate side edge 501 is provided on the upper edge of the cover plate 5; the outer diameter of the cover plate 5 together with the cover plate side edge 501 is slightly larger than or equal to the outer diameter of the lower drain outlet 2; the cover plate side edge 501 is made of rubber material, which is thin and has a certain flexibility; under normal circumstances, the cover plate 5 together with the cover plate side edge 501 can cover the lower end opening of the lower drain outlet 2, and can also play the role of closing the valve; when the inner drain cylinder 3 needs to be taken out from the outer cylinder 1, it is only necessary to pull the inner drain cylinder 3 upwards, and the cover plate 5 and the cover plate side edge 501 will enter the lower drain outlet 2 together, and then the inner drain cylinder 3 can be pulled out.

[0080] Example 3

[0081] Based on Example 1, in Example 1, the spring column 4 adopts the spring column structure of the existing spring pressing valve;

[0082] like Figure 9 As shown, the spring column 4 in this embodiment includes: a spring column housing 401, a spring column core rod 402, a spring 403 and a limit clamping rod 405;

[0083] A through hole is provided in the center of the upper and lower end surfaces of the spring column housing 401; a spring column core rod 402 is movably arranged in the spring column housing 401; the spring column core rod 402 can just pass through the through holes on the upper and lower end surfaces of the spring column housing 401; a cover plate 5 is provided in the center of the lower end of the spring column core rod 402; a spring 403 is sleeved on the outer periphery of the lower part of the spring column core rod 402; there is no contact between the spring 403 and the spring column core rod 402; the lower end of the spring 403 is provided on the bottom surface of the spring column housing 401, and the upper end of the spring 403 contacts the bottom of the lower pressure block 404 provided on the spring column core rod 402; two limiting clamping rods 405 are symmetrically provided on the side wall of the spring column core rod 402 above the lower pressure block 404; the end of the limiting clamping rod 405 away from the spring column core rod 402 is movably embedded in the groove 4011 provided on the inner wall of the spring column housing 401.

[0084] The above-mentioned limit clamping rod 405 includes a long vertical rod and two short horizontal rods; the two short horizontal rods are vertically connected to the upper and lower ends of the long vertical rod respectively; the short horizontal rod located at the top faces the spring column core rod 402 and is connected to the spring column core rod 402; the short horizontal rod located at the bottom faces the spring column housing 401 and is movably embedded in the groove 4011 provided on the inner wall of the spring column housing 401;

[0085] The groove 4011 is a V-shaped structure, and the bottom of the V-shaped groove 4011 is a horizontal transition groove 4012 ; an arc-shaped groove opening 4013 is provided above the horizontal transition groove 4012 .

[0086] When the spring 403 in the spring column 4 is not compressed, the short cross bars at the upper and lower ends of the limit clamping rod 405 are located at the top of the V-shaped groove 4011; at this time, the cover plate 5 blocks the lower drain outlet 2. As the spring column core rod 402 is pressed downward, the short cross bars at the upper and lower ends of the limit clamping rod 405 follow the trajectory of the V-shaped groove 4011, eventually reaching the horizontal transition groove 4012 at the lowest point, and the short cross bars will be locked into the arc-shaped groove opening 4013; at this time, the compression deformation of the spring 403 is maintained, and the position of the spring column core rod 402 is also maintained. The cover plate 5 and the lower end opening of the lower drain outlet 2 are separated, and the drain is now in a state where water can be drained.

[0087] Press the spring 403 downward again, the short cross bar leaves the arc groove opening 4013, and gradually returns to the highest point of the groove 4011 from the other side of the V-shaped groove 4011; at this time, the spring 403 returns to its original state, and the cover plate 5 blocks the lower end opening of the lower drain outlet 2 again.

[0088] Example 4

[0089] Based on Example 1, in Example 1, a limiting support step 101 is stacked on the inner side wall of the lower end opening of the outer tube 1. When the inner drainage tube 3 is placed in the outer tube 1, the edge of the lower end opening of the inner drainage tube 3 contacts the two symmetrically arranged limiting support steps 101; due to the supporting effect of the limiting support steps 101, the upper end opening of the inner drainage tube 3 is flush with the upper end opening of the outer tube 1, and the inner drainage tube 3 will not fall into the outer tube 1.

[0090] The position-limiting support step 101 plays a supporting role, but there is no temporary connection structure between the inner drainage tube 3 and the outer tube 1 . When pressed, the inner drainage tube 3 may shake slightly.

[0091] like Figure 11 and Figure 12 As shown, this embodiment has a socket 1011 defined within the position-limiting support step 101; attached blocks 302 are symmetrically positioned around the lower edge of the inner drain tube 3; and posts 303 are positioned below the attached blocks 302. When the inner drain tube 3 is placed within the outer tube 1, the posts 303 fit neatly within the socket 1011. This embodiment provides three sockets on each side, corresponding to three posts.

[0092] The insertion hole 1011 and the insertion column 303 form a mortise and tenon structure, so that a temporary connection structure is formed between the inner drainage tube 3 and the outer tube 1; so that the inner drainage tube 3 is placed in the outer tube 1 more stably.

[0093] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0094] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, numerous modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A spring-loaded drain valve, characterized in that: include: Outer cylinder, inner drainage cylinder, spring column and cover plate; The upper and lower ends of the outer cylinder and the inner drainage cylinder are both open structures; The outer cylinder is arranged on the drain outlet of the sink; The inner drainage cylinder is detachably arranged inside the outer cylinder; A spring column is centrally arranged in the inner drainage cylinder; A cover plate is provided at the lower end of the spring column; The cover plate is located below the lower end openings of the outer cylinder and the inner drainage cylinder; The upper opening of the inner drainage cylinder is connected and fixed to the spring column through a connecting structure.

2. A spring-pressed drain valve according to claim 1, characterized in that: A lower drain outlet is provided at the lower end opening of the outer cylinder; The inner and outer diameters of the lower drain outlet are smaller than the inner and outer diameters of the outer cylinder; The cover plate is located below the lower end opening of the lower drain outlet; the outer diameter of the cover plate is equal to the outer diameter of the lower drain outlet.

3. The spring-pressed drain valve according to claim 1, characterized in that: A limit support step is symmetrically provided on the inner side wall near the lower end opening of the outer cylinder; When the inner drainage cylinder is placed in the outer cylinder, the lower opening edge of the inner drainage cylinder is exactly located on the limit support step; A socket is provided in the limit support step; Attached blocks are symmetrically arranged on the edge of the lower opening of the inner drainage cylinder; and inserted columns are arranged below the attached blocks; When the inner drainage cylinder is placed in the outer cylinder, the insertion column is inserted into the insertion hole.

4. A spring-pressed drain valve according to claim 3, characterized in that: When the inner drainage cylinder is placed in the outer cylinder, the outer wall of the inner drainage cylinder fits in with the inner wall of the outer cylinder; The upper opening edge of the inner drainage cylinder is flush with the upper opening edge of the outer cylinder.

5. The spring-pressed drain valve according to claim 1, characterized in that: The connection structure between the upper opening edge of the inner drainage cylinder and the spring column is provided with two thin connecting rods; The two thin connecting rods are arranged in a mirror-symmetrical manner.

6. The spring-pressed drain valve according to claim 1, characterized in that: The connection structure is configured as a filter screen covering the area between the upper opening edge of the inner drainage cylinder and the spring column.

7. The spring-pressed drain valve according to claim 2, characterized in that: The outer diameter of the cover plate is smaller than the inner diameter of the lower drain outlet; The upper edge of the cover plate is provided with a cover plate side edge; The outer diameter of the cover plate and the side edge of the cover plate is greater than the inner diameter of the lower drain outlet.

8. The spring-pressed drain valve according to claim 1, characterized in that: The spring column comprises: a spring column housing, a spring column core rod, a spring and a limit clamping rod; The spring column housing has through holes centrally provided on both upper and lower end surfaces; A spring column core rod is movably arranged in the spring column housing; The spring column core rod can just pass through the through holes on the upper and lower end surfaces of the spring column shell; A spring is sleeved on the outer periphery of the lower portion of the spring column core rod; there is no contact between the spring and the spring column core rod; The lower end of the spring is arranged on the inner bottom surface of the spring column housing, and the upper end of the spring contacts the lower part of the lower pressing block arranged on the spring column core rod; Two limiting clamping rods are symmetrically arranged on the side wall of the spring column core rod above the lower pressing block; One end of the position-limiting clamping rod away from the core rod of the spring column is movably embedded in a groove provided on the inner wall of the spring column shell.

9. The spring-pressed drain valve according to claim 8, characterized in that: The position-limiting clamping rod includes a long vertical rod and two short horizontal rods; The two short horizontal bars are vertically connected to the upper and lower ends of the long vertical bar respectively; The short cross bar located at the top faces the spring column core rod and is connected to the spring column core rod; The short cross bar located at the bottom faces the spring column shell and is movably embedded in a groove provided on the inner wall of the spring column shell.

10. A spring-pressed drain valve according to claim 8 or 9, characterized in that: The groove is a V-shaped structure, and the bottom of the V-shaped groove is a horizontal transition groove part; An arc-shaped groove opening is arranged above the horizontal transition groove.

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