A noise-reducing hydraulic drain valve

Abstract

The present invention discloses a noise-reducing hydraulic drain valve, comprising: a valve body having a drain port; a valve core movably mounted on the valve body to open and close the drain port; a hydraulic drive mechanism comprising a hydraulic cylinder mounted on the valve body, a piston slidably mounted on the hydraulic cylinder, and a piston reset elastic member for resetting the piston, wherein the piston and the valve core cooperate with each other and have a linkage idle stroke between them; the piston, under the pressure of fluid entering the hydraulic cylinder, overcomes the elastic force of the piston reset elastic member to slide, thereby driving the valve core to open the drain port; after the fluid pressure is released, the piston, under the elastic force of the piston reset elastic member, slides through the linkage idle stroke, driving the valve core to move in a direction to close the drain port; after the piston is reset, the valve core continues to move relative to the piston for a predetermined distance, and then seals with the drain port. The present invention can significantly reduce the noise when the hydraulic drain valve is closed, while also providing a certain degree of protection for the valve core, reducing the requirements for assembly dimensions, and ensuring the sealing effect of the valve core.

Description

Technical Field

[0001] The present invention relates to the technical field of drain valves for toilet water tanks, and in particular to a noise-reducing hydraulic drain valve. Background Art

[0002] Some existing toilet tank drain valves use hydraulic actuation to open the drain outlet. These valves typically include a valve body with a drain outlet, a valve core movably mounted on the valve body to open and close the drain outlet, and a hydraulic actuation mechanism that links the valve core. The hydraulic actuation mechanism typically includes a hydraulic cylinder mounted on the valve body, a piston slidably mounted on the hydraulic cylinder, and a piston return spring for resetting the piston. However, existing pistons are typically rigidly connected to the valve core. When the piston is reset by the piston return spring, the piston also drives the valve core to close the drain outlet. In such existing structures, the piston return spring causes the valve core to exert a significant impact force on the edge of the drain outlet when closing the drain valve, resulting in loud noise when closing the drain valve and a tendency for the valve core to deform under stress, leading to leakage. These valves place stringent requirements on the dimensional and assembly tolerances of the various components. For example, if the piston's downward travel is insufficient, the valve core may fail to seal the drain outlet. However, if the piston's downward travel is excessive, the valve core may deform under stress, leading to leakage. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a noise-reducing hydraulic drain valve, which can greatly reduce the noise when the hydraulic drain valve is closed, while providing a certain protection for the valve core and greatly reducing the error requirements for assembly dimensions.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a noise-reducing hydraulic drain valve, comprising:

[0005] a valve body having a drain port;

[0006] a valve core movably disposed on the valve body to open and close the drain port;

[0007] A hydraulic drive mechanism includes a hydraulic cylinder provided on the valve body, a piston slidably provided on the hydraulic cylinder, and a piston reset elastic member for resetting the piston, wherein the piston is linked with the valve core and a linkage idle stroke is provided between the two.

[0008] The piston overcomes the elastic force of the piston reset elastic member under the fluid pressure entering the hydraulic cylinder and slides, thereby driving the valve core to open the drain outlet; after the fluid pressure is released, the piston slides the linkage idle stroke under the elastic force of the piston reset elastic member and drives the valve core to move in the direction of closing the drain outlet. After the piston is reset to its position, the valve core continues to move relative to the piston for a predetermined distance and then seals with the drain outlet.

[0009] In a preferred embodiment, the predetermined distance is less than or equal to the linkage idle stroke.

[0010] In a preferred embodiment, the valve core includes a valve stem and a sealing disk, the sealing disk is fixed to the bottom end of the valve stem and cooperates with the drain port, the piston includes a compression part and a rod part that are connected, the compression part is located in the hydraulic cylinder, the rod part extends out of the hydraulic cylinder and is connected to the valve stem, and the linkage idle stroke is provided between the rod part and the valve stem.

[0011] In a preferred embodiment, a linkage groove extending along the sliding direction of the valve stem is provided on one of the valve stem and the rod portion, and a limit pin is provided on the other of the valve stem and the rod portion. The limit pin slides in the linkage groove, and a linkage cooperation with a linkage idle stroke is achieved between the rod portion and the valve stem through the limit pin and the linkage groove, and the linkage idle stroke = the length of the linkage groove - the thickness of the limit pin.

[0012] In a preferred embodiment, the valve stem is a hollow structure, an opening is formed at the top end of the valve stem, the rod portion is inserted into the valve stem through the top end opening of the valve stem, a linkage groove is provided on opposite sides of the valve stem, an installation channel is provided radially on the rod portion, the limit pin is passed through the installation channel and the rod portion is exposed at both ends to cooperate with the linkage groove.

[0013] In a preferred embodiment, the rod portion is a hollow structure, an opening is formed at the top end of the rod portion, a positioning hole is provided in the middle of the limit pin, a positioning pin is inserted into the rod portion through the top end opening of the rod portion and inserted into the positioning hole, and the positioning pin is used to prevent the limit pin from radially detaching from the mounting channel.

[0014] In a preferred embodiment, after the piston is reset, the valve core continues to move relative to the piston for the predetermined distance under the action of its own gravity and / or the suction force of the water flow in the drain outlet, and then seals with the drain outlet.

[0015] In a preferred embodiment, an elastic member is provided between the piston and the valve core. During the process in which the piston drives the valve core to move in the direction of closing the drain outlet, the piston drives the elastic member to elastically deform. After the piston returns to its position, the elastic member helps the valve core to continue to move the predetermined distance relative to the piston.

[0016] In a preferred embodiment, the valve core includes a valve stem and a sealing disk, the sealing disk is fixed to the bottom end of the valve stem and cooperates with the drain port, the piston includes a compression part and a rod part connected to each other, the compression part is located in the hydraulic cylinder, the rod part extends out of the hydraulic cylinder and is connected to the valve stem, and there is a linkage idle stroke between the rod part and the valve stem, the valve stem is a hollow structure with an opening at the top end, the rod part extends into the valve stem from the top opening of the valve stem, and the elastic part is a compression spring, and the compression spring bounces between the bottom end of the rod part and the bottom wall of the inner cavity of the valve stem.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention designs the linkage between the piston and the valve core of the hydraulic drive mechanism to have a linkage idle stroke, so that after the piston is reset to its position, the valve core can continue to move relative to the piston for a predetermined distance before it seals and cooperates with the drain port. In other words, the piston does not directly drive the valve core to move to the position of sealing and closing the drain port, but the piston is reset to its position in advance, and the valve core is reset to its position afterwards. In this way, the piston will not force the valve core to cooperate with the drain port, which can avoid the problem of the valve core being forced to abut against the edge of the drain port and making a loud noise under the push of the piston. Moreover, since the valve core is not forced to close the drain port by the action of the piston, the problem of the valve core being deformed due to the long-term action of the piston after long-term use can be avoided. It can play a certain protective role on the valve core, making the product have a longer service life and a more reliable seal. The present invention has a simple structure, obvious noise reduction effect, reliable function, and can greatly reduce the error requirements for assembly dimensions.

[0019] Designing the predetermined distance to be smaller than the linkage idle stroke can reduce the requirements on the size of each component and make manufacturing easier.

[0020] A linkage idle stroke is formed by adopting a limit pin and a linkage groove. The linkage idle stroke = the length of the linkage groove - the thickness of the limit pin, and the structure is simple.

[0021] The positioning pin is used to prevent the limit pin from radially separating from the installation channel, and the structure is simple and easy to assemble.

[0022] An elastic part is provided between the piston and the valve core. When the piston drives the valve core to move in the direction of closing the drain outlet, the piston drives the elastic part to elastically deform. After the piston is reset into position, the elastic part helps the valve core to continue to move a predetermined distance relative to the piston. By helping the valve core to reset with the help of the elastic part, the valve core can be reset more reliably and the sealing effect of the valve core on the drain outlet can be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional assembly diagram of a hydraulic drain valve according to a first embodiment of the present invention;

[0024] Figure 2 is a three-dimensional exploded view of a hydraulic drain valve according to a first embodiment of the present invention;

[0025] Figure 3 is a cross-sectional view of the hydraulic drain valve of the first embodiment of the present invention in an initial state;

[0026] Figure 4 is a cross-sectional view of the hydraulic drain valve according to the first embodiment of the present invention in a draining state;

[0027] Figure 5 is a perspective view of a valve core of a hydraulic drain valve according to a first embodiment of the present invention;

[0028] Figure 6 2 is a cross-sectional view of a hydraulic drain valve according to a second embodiment of the present invention in an initial state.

[0029] The following are the descriptions of the reference numerals:

[0030] 10-valve body; 11-lower valve body; 111-drain port; 12-upper valve body;

[0031] 20-valve core; 21-valve stem; 211-linkage groove; 22-sealing disk;

[0032] 30- hydraulic drive mechanism; 31- hydraulic cylinder; 311- water inlet channel; 32- piston; 321- compression part; 322- rod; 3221- limit pin; 32211- positioning hole; 3222- installation channel; 3223- positioning pin; 33- piston reset elastic member;

[0033] 40-Elastic piece. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0035] See Figures 1 to 6 As shown, a noise-reducing hydraulic drain valve according to a first embodiment of the present invention includes:

[0036] The valve body 10 has a drain port 111;

[0037] The valve core 20 is movably mounted on the valve body 10 to open and close the drain port 111;

[0038] The hydraulic drive mechanism 30 includes a hydraulic cylinder 31 provided on the valve body 10, a piston 32 slidably provided on the hydraulic cylinder 31, and a piston reset elastic member 33 for resetting the piston 32. The piston 32 is linked to the valve core 20 and there is a linkage idle stroke between the two.

[0039] Under the fluid pressure entering the hydraulic cylinder 31, the piston 32 overcomes the elastic force of the piston reset elastic member 33 and slides, thereby driving the valve core 20 to open the drain outlet 111; after the fluid pressure is released, the piston 32 slides under the elastic force of the piston reset elastic member 33 and then drives the valve core 20 to move in the direction of closing the drain outlet 111. After the piston 32 is reset to its position, the valve core 20 continues to move relative to the piston 32 for a predetermined distance and then seals with the drain outlet 111.

[0040] Specifically, after the piston 32 is reset, the valve core 20 can continue to move relative to the piston 32 for a predetermined distance under the action of its own gravity and / or the suction of the water flow in the drain outlet 111 and then seal with the drain outlet 111.

[0041] The piston reset elastic member 33 is preferably a compression spring. Of course, it can also be an elastic member of an airbag structure, etc. The specific elastic structure is not limited as long as it can drive the piston 32 to reset.

[0042] In this embodiment, the hydraulic cylinder 31 is provided with a water inlet channel 311, which provides pressurized water (such as tap water or water from a pump device) to the inner cavity of the hydraulic cylinder. The opening and closing of the water inlet channel 311 can be controlled by a valve device such as a solenoid valve.

[0043] In this embodiment, the valve body 10 includes a lower valve body 11 fixed to the bottom wall of the water tank (not shown) and an upper valve body 12 fixedly connected to the lower valve body 11 . The drain port 111 is provided in the lower valve body 11 , and the hydraulic cylinder 31 is fixed to the upper valve body 12 .

[0044] In this embodiment, the predetermined distance is preferably less than the linkage idle stroke. This reduces the dimensional requirements for various components and facilitates manufacturing. Of course, in some embodiments, the predetermined distance may be equal to the linkage idle stroke. However, such a design would impose higher dimensional requirements. Because the predetermined distance in this embodiment is less than the linkage idle stroke, when the piston 32 moves from its initial position toward the compression cylinder 31, it moves a distance equal to the difference between the linkage idle stroke and the predetermined distance before the valve core 20 moves toward opening the drain port 111.

[0045] In this embodiment, the valve core 20 includes a valve stem 21 and a sealing disk 22. The sealing disk 22 is fixed to the bottom end of the valve stem 21 and engages with the drain port 111. The piston 32 includes a compression portion 321 and a rod portion 322, which are connected to each other. The compression portion 321 is located within the hydraulic cylinder 31 and slidably engages with the inner wall of the hydraulic cylinder 31. The rod portion 322 extends downward from the hydraulic cylinder 31 and is connected to the valve stem 21. The rod portion 322 and the valve stem 21 have the aforementioned linkage idle travel.

[0046] Specifically, the valve stem 21 is provided with a linkage groove 211 extending in the sliding direction of the valve stem 21, and the rod portion 322 is provided with a limit pin 3221. The limit pin 3221 slides within the linkage groove 211. The limit pin 3221 and the linkage groove 211 achieve a linkage with a linkage idle stroke between the rod portion 322 and the valve stem 21. The linkage idle stroke = the length of the linkage groove 211 minus the thickness of the limit pin 3221. Of course, alternatively, the linkage groove can be provided on the rod portion 322, while the limit pin is provided on the valve stem 21.

[0047] Preferably, the valve stem 21 is a hollow structure, an opening is formed at the top end of the valve stem 21, and the rod portion 322 is inserted into the valve stem 21 through the top end opening of the valve stem 21. A linkage groove 211 is provided on the opposite sides of the valve stem 21, and an installation channel 3222 is radially provided on the rod portion 322. The limit pin 3221 is passed through the installation channel 3222 and the rod portion 322 is exposed at both ends to cooperate with the linkage groove 211.

[0048] In order to prevent the limiting pin 3221 from radially disengaging from the mounting channel 3222, in this embodiment, the rod portion 322 is designed as a hollow structure, an opening is formed at the top end of the rod portion 322, and a positioning hole 32211 is provided in the middle of the limiting pin 3221. A positioning pin 3223 is inserted into the rod portion 322 through the top end opening of the rod portion 322 and inserted into the positioning hole 32211. The positioning pin 3223 prevents the limiting pin 3221 from radially disengaging from the mounting channel 3222. The structure is simple and easy to assemble.

[0049] See also Figure 3 At this time, the hydraulic drain valve is in the initial state, the piston 32 is in the downward position under the action of the piston reset elastic member 33, and the valve core 20 is in the position of closing the drain port 111. At this time, the piston 32 does not apply any force to the valve core 20.

[0050] See also Figure 4 At this time, the hydraulic drain valve is in the drainage state, water flows into the hydraulic cylinder 31 through the water inlet channel 311, and the piston 32 slides upward under the fluid pressure entering the hydraulic cylinder 31, overcoming the elastic force of the piston reset elastic member 33. When the sliding stroke of the piston 32 = the linkage idle stroke - the predetermined distance, the piston 32 begins to drive the valve core 20 to move upward and open the drain port 111 to achieve drainage.

[0051] When the drainage is completed, the water inlet channel 311 is cut off, and the hydraulic cylinder 31 starts to relieve pressure (the pressure relief structure of the hydraulic cylinder 31 can adopt existing technology, such as setting a pressure relief hole for pressure relief, etc., which is not explained in detail here). The piston 32 slides in the linkage idle stroke under the elastic force of the piston reset elastic member 33, and drives the valve core 20 to move in the direction of closing the drain outlet 111. After the piston 32 is reset to its position, the valve core 20 can continue to move relative to the piston 32 for a predetermined distance under the action of its own gravity and / or the suction of the water flow at the drain outlet 111, and then seal with the drain outlet 111, thereby achieving water stopping.

[0052] See also Figure 6 The second embodiment of the present invention is a noise-reducing hydraulic drain valve. This embodiment differs from the first embodiment only in that an elastic member 40 is disposed between the piston 32 and the valve core 20. As the piston 32 moves the valve core 20 toward closing the drain port 111, the piston 32 elastically deforms the elastic member 40. After the piston 32 returns to its original position, the elastic member 40 assists the valve core 20 in continuing to move relative to the piston 32 a predetermined distance. Specifically, the elastic member 40 is a compression spring that springs between the bottom end of the rod 322 and the bottom wall of the inner cavity of the valve stem 21.

[0053] In this embodiment, the elastic member 40 assists the valve core 20 in resetting, which can make the valve core 20 more reliably reset and make the valve core 20 have a better sealing effect on the drain port 111.

[0054] The remaining structures not described in this embodiment refer to the description of the first embodiment, and the working process is also roughly the same as that of the first embodiment, which will not be repeated here.

[0055] The present invention designs the linkage between the piston and the valve core of the hydraulic drive mechanism to have a linkage idle stroke, so that after the piston is reset to its position, the valve core can continue to move relative to the piston for a predetermined distance before it seals and cooperates with the drain port. In other words, the piston does not directly drive the valve core to move to the position of sealing and closing the drain port, but the piston is reset to its position in advance, and the valve core is reset to its position afterwards. In this way, the piston will not force the valve core to cooperate with the drain port, which can avoid the problem of the valve core being forced to abut against the edge of the drain port and making a loud noise under the push of the piston. Moreover, since the valve core is not forced to close the drain port by the action of the piston, the problem of the valve core being deformed due to the long-term action of the piston after long-term use can be avoided. It can play a certain protective role on the valve core, making the product have a longer service life and a more reliable seal. The present invention has a simple structure, obvious noise reduction effect, reliable function, and can greatly reduce the error requirements for assembly dimensions.

[0056] The above embodiments are only used to further illustrate the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A noise-reducing hydraulic drain valve, characterized in that: include: a valve body having a drain port; a valve core movably disposed on the valve body to open and close the drain port; A hydraulic drive mechanism includes a hydraulic cylinder provided on the valve body, a piston slidably provided on the hydraulic cylinder, and a piston reset elastic member for resetting the piston, wherein the piston is linked with the valve core and a linkage idle stroke is provided between the two. The piston overcomes the elastic force of the piston reset elastic member under the fluid pressure entering the hydraulic cylinder and slides, thereby driving the valve core to open the drain outlet; after the fluid pressure is released, the piston slides the linkage idle stroke under the elastic force of the piston reset elastic member and drives the valve core to move in the direction of closing the drain outlet. After the piston is reset to its position, the valve core continues to move relative to the piston for a predetermined distance and then seals with the drain outlet.

2. The noise-reducing hydraulic drain valve according to claim 1, characterized in that: The predetermined distance is less than or equal to the linkage idle stroke.

3. The noise-reducing hydraulic drain valve according to claim 1, characterized in that: The valve core includes a valve stem and a sealing disk, the sealing disk is fixed to the bottom end of the valve stem and cooperates with the drain port, the piston includes a compression part and a rod part connected to each other, the compression part is located in the hydraulic cylinder, the rod part extends out of the hydraulic cylinder and is connected to the valve stem, and the linkage idle stroke is provided between the rod part and the valve stem.

4. The noise-reducing hydraulic drain valve according to claim 3, characterized in that: One of the valve stem and the rod portion is provided with a linkage groove extending along the sliding direction of the valve stem, and the other of the valve stem and the rod portion is provided with a limit pin, and the limit pin slides in the linkage groove. The limit pin and the linkage groove realize linkage cooperation with a linkage idle stroke between the rod portion and the valve stem, and the linkage idle stroke = the length of the linkage groove - the thickness of the limit pin.

5. The noise-reducing hydraulic drain valve according to claim 4, characterized in that: The valve stem is a hollow structure, and an opening is formed at the top end of the valve stem. The rod is inserted into the valve stem through the top end opening of the valve stem. A linkage groove is provided on each of the opposite sides of the valve stem. An installation channel is provided radially on the rod. The limit pin is passed through the installation channel and the rod is exposed at both ends to cooperate with the linkage groove.

6. The noise-reducing hydraulic drain valve according to claim 5, characterized in that: The rod portion is a hollow structure, an opening is formed at the top end of the rod portion, a positioning hole is provided in the middle of the limit pin, a positioning pin is inserted into the rod portion through the top end opening of the rod portion and inserted into the positioning hole, and the positioning pin is used to prevent the limit pin from radially detaching from the installation channel.

7. The noise-reducing hydraulic drain valve according to claim 1, characterized in that: After the piston is reset, the valve core continues to move relative to the piston for the predetermined distance under the action of its own gravity and / or the suction force of the water flow in the drain outlet, and then seals and cooperates with the drain outlet.

8. The noise-reducing hydraulic drain valve according to claim 7, characterized in that: An elastic member is provided between the piston and the valve core. When the piston drives the valve core to move toward closing the drain outlet, the piston drives the elastic member to elastically deform. After the piston returns to its position, the elastic member helps the valve core to continue to move the predetermined distance relative to the piston.

9. The noise-reducing hydraulic drain valve according to claim 8, characterized in that: The valve core includes a valve stem and a sealing disk, which is fixed to the bottom end of the valve stem and cooperates with the drain port. The piston includes a compression part and a rod part that are connected to each other. The compression part is located in the hydraulic cylinder. The rod part extends out of the hydraulic cylinder and is connected to the valve stem. There is a linkage idle stroke between the rod part and the valve stem. The valve stem is a hollow structure with an opening at the top. The rod part extends into the valve stem from the top opening of the valve stem. The elastic member is a compression spring, which bounces between the bottom end of the rod part and the bottom wall of the inner cavity of the valve stem.

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