Diaphragm pump pressure relief structure and diaphragm pump

Abstract

The present invention belongs to the technical field of diaphragm pumps for water purifiers, and in particular, to a diaphragm pump pressure relief structure for a water purifier and a diaphragm pump including the pressure relief structure. The present invention provides a diaphragm pump pressure relief structure and a diaphragm pump, wherein a buffer cavity is formed in a mounting groove, and a protrusion that cooperates with an elastic member and a cavity side wall is formed at the outlet end of a first pressure relief hole. In an initial state, the valve plate is pressed against the end face of the protrusion under the action of the elastic member to close the first pressure relief hole. In a pressure relief state, the valve plate is partially deformed, and a second pressure relief hole connecting the first pressure relief hole and the buffer cavity is formed between the valve plate and the protrusion. During the pressure relief process, high-pressure water flows from the high-pressure cavity through the first pressure relief hole and the second pressure relief hole into the buffer cavity to form a first pressure drop. The high-pressure water in the buffer cavity flows into the low-pressure cavity through the third pressure relief hole to form a second pressure drop. By adding a buffer cavity, a multi-stage pressure drop of the high-pressure water flow is achieved, thereby reducing the sharp noise generated during pressure relief.

Description

Technical Field

[0001] The present invention belongs to the technical field of diaphragm pumps for water purifiers, and in particular to a diaphragm pump pressure relief structure for a water purifier and a diaphragm pump comprising the pressure relief structure. Background Art

[0002] With the popularity of household and commercial water purifiers, consumers have higher and higher requirements for the performance of water purifiers, especially the quietness of water purifiers during operation. A large part of the noise of water purifiers comes from the internal diaphragm booster pump.

[0003] When working, the diaphragm booster pump continuously provides a large water pressure to the filter membrane of the water purifier, thus generating noise. And with the improvement of energy-saving standards and the popularization of large-flux membranes, the working pressure required to be provided by the diaphragm booster pump is also getting higher and higher, making it easier for the diaphragm booster pump to open the pressure relief device, thus causing the diaphragm booster pump to generate greater pressure relief noise. During the pressurization process, the diaphragm pumps currently on the market will increase their noise linearly as the output water pressure increases, especially the sharp sound emitted by the pressure relief device when releasing pressure, which seriously affects the public's experience of the water purifier. Summary of the invention

[0004] The object of the present invention is to overcome the deficiencies in the prior art and to provide a diaphragm pump pressure relief structure and a diaphragm pump, which can effectively reduce the noise generated when the diaphragm pump is working.

[0005] This diaphragm pump pressure relief structure includes:

[0006] The fluid chamber includes a low-pressure chamber connected to the water inlet, a high-pressure chamber connected to the water outlet, a first pressure relief hole connected to the high-pressure chamber, and a mounting groove located at an outlet end of the first pressure relief hole;

[0007] A top cover, mounted on the fluid chamber by screws to close the mounting groove;

[0008] The valve plate is arranged in the mounting groove and is located between the fluid chamber and the top cover;

[0009] An elastic member, with two ends pressed between the top cover and the valve plate;

[0010] A buffer cavity is formed in the mounting groove, and a third pressure relief hole connecting the low-pressure cavity and the buffer cavity is provided in the buffer cavity; a cavity is formed on the top cover at a position corresponding to the first pressure relief hole, and the elastic member is arranged in the cavity; a protrusion that cooperates with the elastic member and the side wall of the cavity is formed at the outlet end of the first pressure relief hole, and in the initial state, the valve plate is pressed against the end face of the protrusion under the action of the elastic member to close the first pressure relief hole, and in the pressure relief state, the valve plate is partially deformed, and a second pressure relief hole connecting the first pressure relief hole and the buffer cavity is formed between the valve plate and the protrusion. During the pressure relief process, the high-pressure water flows from the high-pressure cavity through the first pressure relief hole and the second pressure relief hole into the buffer cavity to form the first pressure drop, and the high-pressure water in the buffer cavity flows into the low-pressure cavity through the third pressure relief hole to form the second pressure drop. By adding a buffer cavity, a multi-stage pressure drop of the high-pressure water flow is achieved, thereby reducing the sharp noise generated during pressure relief.

[0011] Preferably, the cavity is a cylindrical cavity coaxially arranged with the first pressure relief hole; the raised portion includes a hollow cylindrical boss coaxially arranged with the first pressure relief hole, and a plurality of pressure ribs distributed around the boss, and the outer diameter of the boss is smaller than the inner diameter of the cavity; the side wall of the cavity presses the valve plate against the pressure ribs, and the elastic member presses the valve plate against the end face of the boss to achieve the closure of the first pressure relief hole. The process of achieving pressure relief in this structure is specifically as follows: since the outer diameter of the boss is smaller than the inner diameter of the cavity, the valve plate undergoes local deformation under the action of the high-pressure water flow, and the elastic part is compressed, that is, the part of the valve plate corresponding to the cavity is recessed into the cavity under the action of the high-pressure water flow (at this time, the elastic part is further compressed and retracted into the distance of one end of the cavity), and at the same time, the outer circle of the recessed part of the valve plate is still pressed against the pressure rib under the action of the side wall of the cavity. At this time, the second pressure relief hole will be formed between the end face of the boss and the valve plate, and the high-pressure water flows from the high-pressure cavity through the first pressure relief hole and the second pressure relief hole into the buffer cavity to form the first pressure drop.

[0012] Preferably, in the pressure relief state, the portion of the valve plate corresponding to the elastic member is deformed (with a limited deformation amount) and recessed into the cavity. At the same time, the outer circle of the deformed portion of the valve plate is pressed against the pressure rib under the action of the side wall of the cavity. Since the outer diameter of the boss is smaller than the inner diameter of the cavity, the second pressure relief hole is formed between the valve plate and the raised portion.

[0013] Preferably, the second pressure relief hole is formed between the outer edge of the boss end surface and the valve plate, and is located between two adjacent pressure ribs.

[0014] Preferably, the buffer cavity is formed on the periphery of the raised portion; there are multiple second pressure relief holes arranged around the boss; the use of multiple second pressure relief holes and the buffer cavity arranged around the boss can further disperse and block the generation of pressure relief noise.

[0015] Preferably, the top cover presses the edge portion of the valve plate into the mounting groove, which on the one hand realizes the sealing of the mounting groove, and on the other hand, the buffer cavity is formed by the fluid chamber, the valve plate, and the raised portion. That is, the sealing of the mounting groove and the sealing of the first pressure relief hole are realized by a whole valve plate while forming the buffer cavity, so the overall sealing is better and the structure is simpler.

[0016] Preferably, the valve plate is pressed on the first pressure relief hole to separate the high-pressure chamber from the buffer chamber. After installation, the buffer chamber, the low-pressure chamber and the high-pressure chamber are located on the same side of the valve plate, which can not only realize the flexible adjustment of the sealing pressure, but also reduce the risk of excessive fluctuation of the outlet pressure caused by the fluctuation of the water inlet pressure of the booster pump.

[0017] Preferably, the valve plate includes a body, a first groove formed on the upper end surface of the body, a second groove formed on the lower end surface of the body, and a pressing portion formed on the edge of the body; the first groove and the second groove are arranged in a staggered manner, the side wall of the cavity and the elastic member in the cavity are embedded in the first groove and abut against the bottom surface of the first groove, the top cover presses the pressing portion in the installation groove, and the second groove is opposite to the bottom surface of the installation groove to form the buffer cavity. The integral valve plate is used to achieve the sealing of the installation groove and the first pressure relief hole, and the volume of the buffer cavity is increased by using the second groove.

[0018] Preferably, the top cover is connected with an adjusting screw by a thread, and two ends of the elastic member are respectively against the valve plate and the adjusting screw. The maximum water outlet pressure is adjusted by rotating the adjusting screw.

[0019] Preferably, the elastic member comprises a spring and two spring seats respectively located at two ends of the spring, and the two spring seats respectively abut against the valve plate and the adjusting screw.

[0020] A diaphragm pump comprises the aforementioned pressure relief structure.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention forms a buffer cavity in the installation groove, and at the same time, a protrusion that cooperates with the elastic member and the side wall of the cavity is formed at the outlet end of the first pressure relief hole. In the initial state, the valve plate is pressed against the end face of the protrusion under the action of the elastic member to close the first pressure relief hole. In the pressure relief state, the valve plate is partially deformed, and a second pressure relief hole connecting the first pressure relief hole and the buffer cavity is formed between the valve plate and the protrusion. During the pressure relief process, the high-pressure water flows from the high-pressure cavity through the first pressure relief hole and the second pressure relief hole into the buffer cavity to form the first pressure drop. The high-pressure water in the buffer cavity flows into the low-pressure cavity through the third pressure relief hole to form the second pressure drop. By adding a buffer cavity, a multi-stage pressure drop of the high-pressure water flow is achieved, thereby reducing the sharp noise generated during pressure relief.

[0023] 2. The raised portion includes a hollow cylindrical boss coaxially arranged with the first pressure relief hole, and a plurality of ribs distributed around the boss. The outer diameter of the boss is smaller than the inner diameter of the cavity. When the pressure is released, the portion of the valve plate corresponding to the cavity is recessed into the cavity under the action of the high-pressure water flow (at this time, the elastic member is further compressed and retracted into the distance of one end of the cavity). At the same time, the outer circle of the recessed portion of the valve plate is still pressed against the ribs under the action of the cavity side wall, thereby forming a second pressure relief hole between the end face of the boss and the valve plate. The high-pressure water flows from the high-pressure cavity through the first pressure relief hole and the second pressure relief hole into the buffer cavity to form the first pressure drop. The position and size relationship between the cavity side wall and the raised portion is reasonably utilized to achieve pressure relief, and the structural design is ingenious.

[0024] 3. The use of multiple second pressure relief holes and a buffer cavity arranged around the boss can further disperse and block the generation of pressure relief noise.

[0025] 4. The high-pressure chamber, buffer chamber, and low-pressure chamber are located on the same side of the valve plate, that is, no matter in the initial state or the pressure relief state, the water in the pump is always located on one side of the valve plate, which can not only realize the flexible adjustment of the blocking pressure, but also reduce the risk of excessive fluctuation of the outlet pressure caused by the fluctuation of the inlet pressure of the booster pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an exploded view of the pressure relief structure of the present invention.

[0027] Figure 2 It is a top view of the pressure relief structure of the present invention.

[0028] Figure 3 for Figure 2 AA section view.

[0029] Figure 4 for Figure 2 BB section view.

[0030] Figure 5 A top view of the fluid chamber.

[0031] Figure 6 It is a three-dimensional diagram of the valve plate in the present invention.

[0032] Figure 7 It is a schematic diagram of the structure when the second pressure relief hole in the present invention is opened.

[0033] Figure 8 It is an exploded view of the diaphragm pump of the present invention.

[0034] Fig. 9 It is a cross-sectional view of the diaphragm pump of the present invention.

[0035] Fig.10 It is a top view of the diaphragm pump of the present invention.

[0036] Fig.11 for Fig.10 CC section view.

[0037] Fig.12 for Fig.10 DD section view.

[0038] Fig.13 for Fig.12 A partial enlarged view of . DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0040] like Figure 1-Figure 7 As shown, the present embodiment provides a diaphragm pump pressure relief structure, comprising:

[0041] The fluid chamber 1 comprises a low-pressure chamber 1-2 connected to the water inlet 1-1, a high-pressure chamber 1-4 connected to the water outlet 1-3, a first pressure relief hole 1-5 (a hollow cylinder in this example) connected to the high-pressure chamber 1-4, and a mounting groove 1-6 located at the outlet end of the first pressure relief hole 1-5; the low-pressure chamber 1-2 is formed after the diaphragm chamber 9 is installed in the fluid chamber 1 (see Fig.11 The side chamber formed between the middle fluid chamber and the diaphragm chamber) and the high pressure chambers 1-4 (see Fig.11 a cavity located in the middle formed between the fluid chamber and the diaphragm chamber);

[0042] A top cover 2 is mounted on the fluid chamber 1 by screws to close the mounting slots 1-6;

[0043] The valve plate 3 is arranged in the mounting groove 1-6 and is located between the fluid chamber 1 and the top cover 2;

[0044] The elastic member 4 has two ends pressed between the top cover 2 and the valve plate 3;

[0045] A buffer cavity 5 is formed in the mounting groove 1-6, and a third pressure relief hole 6 is provided in the buffer cavity, which is connected to the low-pressure cavity 1-2 and the buffer cavity 5; a cavity 2-1 is formed on the top cover 2 at a position corresponding to the first pressure relief hole 1-5, and the elastic member 4 is arranged in the cavity, with one end against the bottom of the cavity; a protrusion 1-7 is formed at the outlet end of the first pressure relief hole 1-5, which cooperates with the elastic member 4 and the side wall 2-2 of the cavity 2-1; in this example, the cavity 2-1 is a cavity arranged coaxially with the first pressure relief hole 1-5. The cylindrical cavity; the raised portion 1-7 includes a hollow cylindrical boss 1-7-1 coaxially arranged with the first pressure relief hole 1-5, and four pressure ribs 1-7-2 distributed around the boss (arranged along the radial direction of the boss, evenly distributed around the boss, and at the same height as the boss), the outer diameter of the boss 1-7-1 is smaller than the inner diameter of the cavity 2-1; in the initial state (non-pressure relief state), the side wall 2-2 of the cavity 2-1 presses the valve plate 3 against the pressure rib 1-7-2, and the elastic member 4 presses the valve plate 3 against the boss 1 -7-1 end face to achieve the closure of the first pressure relief hole 1-5; in the pressure relief state, since the outer diameter of the boss 1-7-1 is smaller than the inner diameter of the cavity 2-1, the valve plate 3 is partially deformed under the action of the high-pressure water flow, and the elastic member 4 is compressed, that is, the part of the valve plate 3 corresponding to the cavity 2-1 is recessed into the cavity 2-1 under the action of the high-pressure water flow (at this time, the elastic member is further compressed and retracted into the distance of one end of the cavity), and the outer circle of the recessed part of the valve plate 3 is still pressed against the pressure rib 1-7-2 under the action of the side wall 2-2 of the cavity 2-1, At this time, a second pressure relief hole 7 connecting the first pressure relief hole 1-5 and the buffer chamber 5 will be formed between the outer edge of the end face of the boss 1-7-1 and the valve plate 3, and the second pressure relief hole 7 is located between two adjacent pressure ribs 1-7-2. The high-pressure water flows from the high-pressure chamber 1-4 through the first pressure relief hole 1-5 and the second pressure relief hole 7 into the buffer chamber 5 to form the first pressure drop. The high-pressure water in the buffer chamber 5 flows into the low-pressure chamber 1-2 through the third pressure relief hole 6 to form the second pressure drop. By adding the buffer chamber 5, a multi-stage pressure drop of the high-pressure water flow can be achieved, thereby reducing the sharp noise generated during pressure relief.

[0046] The buffer cavity 5 is formed on the periphery of the raised portion 1-7, surrounding the raised portion 1-7; there are four second pressure relief holes 7, which are arranged around the boss 1-7-1 and located between two adjacent pressure ribs 1-7-2; the use of multiple second pressure relief holes 7 and the buffer cavity 5 arranged around the boss 1-7-1 can further disperse and block the generation of pressure relief noise.

[0047] The valve plate 3 includes a body 3-1, a first groove 3-2 formed on the upper end surface of the body 3-1, a second groove 3-3 formed on the lower end surface of the body 3-1, and a circle of pressing parts 3-4 formed on the edge of the body 3-1; the first groove 3-2 and the second groove 3-3 are staggered, specifically, the first groove 3-2 is recessed inward from the upper end surface of the body 3-1, and the second groove 3-3 is recessed inward from the lower end surface of the body 3-1, the projections of the first groove 3-2 and the second groove 3-3 on the end surface of the body 3-1 do not overlap, and share a side wall; the side wall of the cavity 2-1 The elastic member 4 in the cavity 2-1 is embedded in the first groove 3-2 and abuts against the bottom surface of the first groove, so that the valve plate 3 is pressed against the pressure rib 1-7-2 by the side wall of the cavity 2-1, and the valve plate 3 is pressed against the end surface of the boss 1-7-1 by the elastic member 4 to achieve the closure of the first pressure relief hole 1-5; the top cover 2 presses the pressing part 3-4 into the installation groove 1-6 to achieve the sealing of the installation groove, and the second groove 3-3 is opposite to the bottom surface of the installation groove 1-6, which expands the volume of the buffer cavity 5 (formed by the fluid chamber, the valve plate, and the convex part). The integral valve plate 3 is used to achieve the sealing of the installation groove 1-6 and the first pressure relief hole 1-5, and the sealing effect is better. At the same time, the volume of the buffer cavity 5 is increased by the second groove 3-3.

[0048] The top cover 2 is threadedly connected with an adjusting screw 8, and the two ends of the elastic member 4 are respectively against the valve plate 3 and the adjusting screw 8. By rotating the adjusting screw 8, the compression degree of the elastic member 4 in the cavity 2-1 can be adjusted, thereby adjusting the maximum water outlet pressure. In this example, the elastic member 4 includes a spring 4-1 and two spring seats 4-2 respectively located at the two ends of the spring, and the two spring seats 4-2 are respectively against the valve plate 3 and the adjusting screw 8.

[0049] The working principle of the pressure relief structure of this embodiment is as follows: the water in the low-pressure chamber 1-2 is pressurized and pressed into the high-pressure chamber 1-4. When the pressure in the high-pressure chamber 1-4 reaches the set pressure value, the elastic member 4 is compressed, and the portion of the valve plate 3 corresponding to the cavity 2-1 is recessed into the cavity 2-1 under the action of the high-pressure water flow. At the same time, the outer circle of the recessed portion of the valve plate 3 is still pressed against the pressure rib 1-7-2 under the action of the side wall 2-2 of the cavity 2-1. At this time, four second pressure relief holes 7 connecting the first pressure relief hole 1-5 and the buffer chamber 5 are formed between the outer edge of the end face of the boss 1-7-1 and the valve plate 3. The high-pressure water flows from the high-pressure chamber 1-4 through the first pressure relief hole 1-5 and the second pressure relief hole 7 into the buffer chamber 5 to form the first pressure drop. The high-pressure water in the buffer chamber 5 flows into the low-pressure chamber 1-2 through the third pressure relief hole 6 to form the second pressure drop, thereby reducing the sharp noise generated during pressure relief.

[0050] like Figure 8-Figure 13As shown, the diaphragm pump of this embodiment includes the aforementioned diaphragm pump pressure relief structure, as well as a diaphragm chamber 9, a diaphragm 10, a bracket 11, and a motor 12 that cooperate with the fluid chamber 1. The fluid chamber 1 presses the diaphragm chamber 9 and the diaphragm 10 onto the bracket 11 in sequence and fixes them by screws. The diaphragm chamber 9 is located between the fluid chamber 1 and the diaphragm 10. A one-way suction valve 13 and a one-way discharge valve 14 are respectively installed on the diaphragm chamber 9. A plurality of boosting chambers 15 are formed between the diaphragm chamber 9 and the diaphragm 10. The boosting chambers A piston 16 is arranged inside, and the piston is fixed on a piston frame component 17 by screws. The piston frame component 17 is connected to the output end of the motor 12. When the motor 12 is working, it drives the piston frame component 17 and the piston 16 to do up and down reciprocating motion together, so that the boosting chamber 15 sucks water flow from the low-pressure chamber 1-2 through the one-way suction valve 13 and boosts the pressure, and then provides high-pressure water flow to the high-pressure chamber 1-4 through the one-way discharge valve 14. When the pressure in the high-pressure chamber 1-4 reaches the set pressure value, the pressure is relieved through the aforementioned pressure relief structure. According to the test, the diaphragm pump adopting the pressure relief structure of the present invention can not only achieve low noise under the rated pressure, but also has no sharp noise when the pressure is relieved under high pressure, and the noise has no obvious change.

Claims

1. A diaphragm pump pressure relief structure, comprising: A fluid chamber (1), the fluid chamber (1) comprising a low-pressure chamber (1-2) connected to a water inlet (1-1), a high-pressure chamber (1-4) connected to a water outlet (1-3), a first pressure relief hole (1-5) connected to the high-pressure chamber (1-4), and a mounting groove (1-6) located at an outlet end of the first pressure relief hole (1-5); A top cover (2) mounted on the fluid chamber (1); A valve plate (3) is arranged in the mounting groove (1-6) and is located between the fluid chamber (1) and the top cover (2); An elastic member (4), with two ends abutting between the top cover (2) and the valve plate (3); The invention is characterized in that: a buffer cavity (5) is formed in the mounting groove (1-6), and a third pressure relief hole (6) is provided in the buffer cavity, which is connected with the low-pressure cavity (1-2) and the buffer cavity (5); a cavity (2-1) is formed on the top cover (2) at a position corresponding to the first pressure relief hole (1-5), and the elastic member (4) is arranged in the cavity; a protrusion (1-7) is formed at the outlet end of the first pressure relief hole (1-5) and cooperates with the elastic member (4) and the side wall of the cavity (2-1); in an initial state, the valve plate (3) is pressed against the end face of the protrusion (1-7) under the action of the elastic member (4) to close the first pressure relief hole (1-5); in a pressure relief state, the valve plate (3) is partially deformed, and a second pressure relief hole (7) is formed between the valve plate (3) and the protrusion (1-7) to connect with the first pressure relief hole (1-5) and the buffer cavity (5); The cavity (2-1) is a cylindrical cavity coaxially arranged with the first pressure relief hole (1-5); the raised portion (1-7) comprises a hollow cylindrical boss (1-7-1) coaxially arranged with the first pressure relief hole (1-5), and a plurality of ribs (1-7-2) distributed around the boss, the outer diameter of the boss (1-7-1) being smaller than the inner diameter of the cavity (2-1); the side wall of the cavity (2-1) presses the valve plate (3) against the ribs (1-7-2), and the elastic member (4) presses the valve plate (3) against the end face of the boss (1-7-1); In the pressure relief state, the portion of the valve plate (3) corresponding to the elastic member (4) is deformed and recessed into the cavity (2-1), and at the same time, the outer ring of the deformed portion of the valve plate (3) is pressed against the pressure rib (1-7-2) under the action of the side wall of the cavity (2-1), and the second pressure relief hole (7) is formed between the valve plate (3) and the outer edge of the end surface of the boss (1-7-1) of the raised portion (1-7), and the second pressure relief hole (7) is located between two adjacent pressure ribs (1-7-2); The valve plate (3) comprises a body (3-1), a first groove (3-2) formed on the upper end surface of the body (3-1), a second groove (3-3) formed on the lower end surface of the body (3-1), and a pressing portion (3-4) formed on the edge of the body (3-1); the first groove (3-2) and the second groove (3-3) are arranged in a staggered manner, the side wall of the cavity (2-1) and the elastic member (4) in the cavity (2-1) are embedded in the first groove (3-2) and abut against the bottom surface of the first groove, the top cover (2) presses the pressing portion (3-4) into the mounting groove (1-6), and the second groove (3-3) is opposite to the bottom surface of the mounting groove (1-6) to form the buffer cavity (5).

2. The diaphragm pump pressure relief structure according to claim 1, characterized in that: The buffer cavity (5) is formed on the periphery of the raised portion (1-7); and there are a plurality of second pressure relief holes (7) arranged around the boss (1-7-1).

3. The diaphragm pump pressure relief structure according to claim 1, characterized in that: The top cover (2) presses the edge of the valve plate (3) into the mounting groove (1-6), and the fluid chamber (1), the valve plate (3), and the raised portion (1-7) together form the buffer cavity (5); the buffer cavity (5), the low-pressure cavity (1-2), and the high-pressure cavity (1-4) are located on the same side of the valve plate (3).

4. The diaphragm pump pressure relief structure according to claim 1, characterized in that: The top cover (2) is connected to an adjusting screw (8) via a thread, and two ends of the elastic member (4) respectively abut against the valve plate (3) and the adjusting screw (8).

5. The diaphragm pump pressure relief structure according to claim 4, characterized in that: The elastic member (4) comprises a spring (4-1) and two spring seats (4-2) respectively located at two ends of the spring, and the two spring seats (4-2) respectively abut against the valve plate (3) and the adjusting screw (8).

6. A diaphragm pump, characterized in that: The invention comprises the pressure relief structure described in any one of claims 1 to 5.

Images