Valve seat structure of diaphragm pump and diaphragm pump

Abstract

A valve seat structure for a diaphragm pump and a diaphragm pump, including a water inlet seat provided in a valve seat, and a water inlet valve mounted in the water inlet seat. The water inlet seat has a mounting hole; the water inlet valve includes a water inlet valve plate and a water inlet valve stem which are connected to each other; the water inlet valve stem is mounted to the mounting hole, and the water inlet valve plate is of a bowl-shaped structure for movably opening and closing the water inlet hole. A guide base is mounted in the mounting hole in a reciprocating sliding manner; the water inlet valve stem has a first end which is fixedly connected to the water inlet valve plate and a second end which penetrates into and is fixed in an intermediate connecting hole of the guide base in the mounting hole.

Description

DESCRIPTIONBackground of the Invention

[0001] The present invention relates to a diaphragm pump.

[0002] The diaphragm pump is a new type of conveying machinery, which generally includes a pump head, a pump seat, a valve seat, a diaphragm, a swing support, a motor, and other components. The diaphragm pump can convey common liquids or various corrosive liquids, liquids with particles, liquids with high viscosity, volatility, flammability, and toxicity, etc. At present, with a rapid development of agricultural automation, people are becoming increasingly interested in using the diaphragm pump to realize automation of agricultural irrigation. Since the diaphragm pumps on the market have insufficient suction force when pumping viscous liquid fertilizer, there is a need for a diaphragm pump with a large flow and a high pressure, which can pump viscous liquid.

[0003] A water inlet valve of an existing diaphragm pump generally adopts a fixed structure, which mainly functions through a negative pressure generated by the movement of the diaphragm in the pump body that deforms a bowl-shaped water inlet valve plate of the fixed water inlet valve so as to open a water inlet hole. However, due to a large adsorption force of viscous liquid on the bowl-shaped water inlet valve plate, the diaphragm pump has insufficient suction force when suctioning the viscous liquid.

[0004] A common solution is to increase the flow and the suction pressure by increasing the power of the motor, such that the diaphragm pump has a good trafficability. However, a high motor speed will definitely result in a large current, and thus a large amount of heat generated by the motor, such that the service life of the motor is short, which will lead to a decrease of the service life of the diaphragm pump, a need for frequent replacement and maintenance, and an increase in the cost.

[0005] There is a diaphragm pump and a diaphragm pump pressure spring valve as disclosed in Chinese Patent Publication No. CN203614385U, where the piston is provided as a thick rubber seal for wear resistance, and in order to prevent the rubber seal from being unable to seal with the valve cavity, a compression spring is sleeved between the piston guide rod and the mounting hole. In this solution, the gland and the piston guide rod are screwed into a whole, such that the piston guide rod needs to be made of a hard material so as to ensure the threaded connection.

[0006] However, the long-term reciprocating movement of the piston is still likely to separate the threads between the gland and the piston guide rod, resulting in a short service life of the diaphragm pump. In addition, since the piston guide rod is made of the hard material but the piston needs to be made of a flexible material, the piston in this solution adopts a structure that one end of the piston guide rod is coated with the piston by injection molding, resulting in a large overall thickness of the piston.

[0007] Therefore, when the piston opens the water inlet hole, the edge of the piston cannot deform to open the water inlet hole, and the opening of the water inlet hole can only be realized by driving the piston guide rod to slide by a long course, such that the current of the motor needs to be increased, the power of the motor is increased, and the service life of the motor is shortened. In summary, the diaphragm pump in this solution is not suitable for suctioning the viscous liquid.

[0008] In view of the above, the present invention provides a novel valve seat structure of diaphragm pump and a diaphragm pump, so as to solve the above problems and the defects of the existing structure.BRIEF SUMMARY OF THE INVENTION

[0009] The present invention intends to provide a valve seat structure of diaphragm pump and a diaphragm pump, which have the advantages of convenience in pumping viscous liquid, long service life, and low cost.

[0010] To attain the above objects, the present invention has the following technical solutions:

[0011] A valve seat structure for a diaphragm pump, comprising a water inlet seat provided in a valve seat; a water inlet valve mounted in the water inlet seat;

[0012] the water inlet seat is provided with a mounting hole and a water inlet hole; the water inlet valve comprises a water inlet valve plate and a water inlet valve stem which are connected to each other; the water inlet valve stem is mounted to the mounting hole, and the water inlet valve plate is of a bowl-shaped structure for movably opening and closing the water inlet hole;

[0013] the water inlet valve plate is positioned on a front side of the water inlet seat; a guide base is provided at a back side of the water inlet seat; the guide base is mounted in the mounting hole in a reciprocating sliding manner; the water inlet valve stem has a first end which is fixedly connected to the water inlet valve plate and a second end which penetrates into and is fixed in an intermediate connecting hole of the guide base in the mounting hole;

[0014] the guide base has a first end which is distant from the water inlet valve plate; the first end of the guide base extends out of the mounting hole and is provided with a radially protruding restricting portion;

[0015] the guide base is sleeved with a pressure spring, and two ends of the pressure spring respectively abut against the restricting portion and an edge of the mounting hole on the back side of the water inlet seat.

[0016] Furthermore, an outer wall of the guide base is in clearance fit with an inner wall of the mounting hole; a blocking ring is arranged between the pressure spring and the edge of the mounting hole; the blocking ring is pressed by the pressure spring and abuts tightly against the edge of the mounting hole, and an inner ring edge of the blocking ring is elastically fitted to the outer wall of the guide base.

[0017] Furthermore, an annular mounting protruding ring protrudes from the edge of the mounting hole; an annular groove is recessed on the blocking ring; the annular groove is fitted into the mounting protruding ring.

[0018] Furthermore, the intermediate connecting hole of the guide base penetrates both ends of the guide base, and the water inlet valve stem penetrates the intermediate connecting hole; an annular slot is formed on the water inlet valve stem; an annular clamping block is provided in the intermediate connecting hole of the guide base; the annular clamping block is clamped in the annular slot.

[0019] Furthermore, the mounting hole is arranged in a middle part of the water inlet seat; a plurality of the water inlet holes are provided and the plurality of water inlet holes are distributed around the mounting hole.

[0020] Furthermore, the front side of the water inlet seat which is adjacent to the water inlet valve plate is a concave surface, and the water inlet valve plate is in an inverted bowl shape to correspond to the concave surface.

[0021] The present invention further provides a diaphragm pump, comprising a pump head, a pump seat, a swing support, a diaphragm, a motor and the aforementioned valve seat structure; the pump head, the pump seat and the motor are connected in sequence; the motor is mounted below the pump seat; one end of the motor penetrates into the pump seat and is mounted with the swing support; the valve seat is arranged between the pump head and the pump seat and above the swing support; the diaphragm is positioned between the valve seat and the swing support; a water inlet cavity and a water outlet cavity are formed between the pump head and the valve seat, and the pump head is provided with a water inlet communicated with the water inlet cavity and a water outlet communicated with the water outlet cavity.

[0022] Furthermore, a middle part of the valve seat is provided with a water outlet zone, and the water outlet zone is defined by an annular wall protruding from a top of the valve seat; an interior of the water outlet zone is provided with five water outlet seats which are circumferentially distributed at equal intervals; a periphery of the water outlet zone is provided with five water inlet seats which are circumferentially distributed at equal intervals, each of the water inlet seats is radially opposite to one of the water outlet seats; the valve seat is correspondingly connected with the pump head; the water outlet cavity is formed between the interior of the water outlet zone and the pump head; the water inlet cavity is formed between an exterior of the water outlet zone and the pump head.

[0023] Furthermore, a pressure relief channel and a pressure blocking cavity are further provided in the pump head; a first end of the pressure relief channel is communicated with the water inlet, and a second end of the pressure relief channel is provided with a communication hole; the communication hole is communicated with the pressure blocking cavity, and the pressure blocking cavity is provided with a pressure hole at a side of the communication hole for communicating with the water outlet; an elastic diaphragm and a diaphragm spring are provided in the pressure blocking cavity, and the elastic diaphragm is abutted by the diaphragm spring to synchronously and movably block the communication hole and the pressure hole.

[0024] Furthermore, the water inlet and the water outlet are separately arranged at two sides of the top of the pump head; the pressure relief channel is transversely arranged between the water inlet and the water outlet, and the communication hole is arranged on the top of the pressure relief channel; the top surface of the pump head is concavely provided with the pressure blocking cavity, and the bottom of the pressure blocking cavity vertically faces the communication hole and the pressure hole; the top of the pressure blocking cavity is in locked closure by the mounting plate; the diaphragm spring is mounted in the pressure blocking cavity, and two ends of the diaphragm spring abut against the mounting plate and the elastic diaphragm respectively.

[0025] Furthermore, the pump head, the pump seat and the motor are locked and fixed into a whole by a plurality of connecting screws which are circumferentially distributed at intervals.

[0026] Furthermore, a one-way valve component is mounted on a water outlet channel inside the water outlet; a peripheral wall of the one-way valve component is provided with an annular sealing ring, and is in sealing fit with the water outlet channel through the annular sealing ring; an inner end of the one-way valve component distant from the water outlet is further provided with a number of elastic hooks protruding radially outward; an inner side of the water outlet channel is provided with a radially concave mounting slot; the one-way valve component is mounted inward from the water outlet, and is clamped in the mounting slot in the inner side of the water outlet channel by the elastic hooks.

[0027] By adopting the above technical solutions, in the diaphragm pump and the valve seat structure of the present invention, the water inlet valve stem with fixed structure in the prior art is changed into a sliding water inlet valve stem, such that in the suctioning of the viscous liquid, the problem that the water inlet valve plate is difficult to open can be overcome; at the same time, the pressure spring can reset the guide base and the water inlet valve; it is not necessary to increase the current of the motor, etc., so as to prevent shortening of the service life of the motor, increase the service life of the product, and realize high flow volume, high pressure, and pumping of viscous liquid.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a perspective diagram of a diaphragm pump according to an embodiment of the present invention;

[0029] FIG. 2 is an exploded view of a diaphragm pump according to an embodiment of the present invention;

[0030] FIG. 3 is a sectional view of a diaphragm pump according to an embodiment of the present invention;

[0031] FIG. 4 is an exploded view of a valve seat according to an embodiment of the present invention;

[0032] FIG. 5 is a schematic view of a water inlet valve according to an embodiment of the present invention;

[0033] FIG. 6 is a sectional view of a valve seat according to an embodiment of the present invention;

[0034] FIG. 7 is a sectional view of a pump head according to an embodiment of the present invention.

[0035] Description of reference numerals: a pump head 1, a pressure blocking cavity 11, a pressure hole 111, an elastic diaphragm 121, a diaphragm spring 122, a mounting plate 13, a water outlet channel 14, a mounting slot 141, a pump seat 2, a swing support 3, a diaphragm 4, a motor 5, a valve seat 6, a water outlet seat 61, a water outlet hole 611, a water inlet seat 62, a water inlet hole 621, a mounting hole 622, a mounting protruding ring 6221, an arc concave surface 623, a water outlet valve 63, a water inlet valve 64, a water inlet valve plate 641, a water inlet valve stem 642, an annular slot 6421, a water outlet zone 65, an annular wall 66, a guide base 67, an intermediate connecting hole 671, an annular clamping block 6711, a restricting portion 672, a pressure spring 68, a blocking ring 69, an inner ring edge 691, an annular groove 692, a water inlet cavity 7, a water inlet 71, a water outlet cavity 8, a water outlet 81, a pressure relief channel 9, a communication hole 91, a one-way valve component 10, an annular sealing ring 101, an elastic hook 102, and a connecting screw a.DETAILED DESCRIPTION OF THE INVENTION

[0036] As shown in FIG. 1 to FIG. 3, the diaphragm pump of the present invention comprises a pump head 1, a pump seat 2, a swing support 3, a diaphragm 4, a motor 5, and a valve seat 6.

[0037] The pump head 1, the pump seat 2 and the motor 5 are connected in sequence. The motor 5 is mounted below the pump seat 2, and one end of the motor 5 penetrates into the pump seat 2 and is mounted with the swing support 3. The valve seat 6 is arranged between the pump head 1 and the pump seat 2 and above the swing support 3. The diaphragm 4 is positioned between the valve seat 6 and the swing support 3. A water inlet cavity 7 and a water outlet cavity 8 are formed between the pump head 1 and the valve seat 6, and the pump head 1 is provided with a water inlet 71 communicated with the water inlet cavity 7 and a water outlet 81 communicated with the water outlet cavity 8.

[0038] In this embodiment, a middle part of the valve seat 6 is provided with a water outlet zone 65, and the water outlet zone 65 is defined by an annular wall 66 protruding from a top of the valve seat 6. An interior of the water outlet zone 65 is provided with five water outlet seats 61 which are circumferentially distributed at equal intervals, and each of the water outlet seats 61 is provided with a water outlet valve 63. A periphery of the water outlet zone 65 is provided with five water inlet seats 62 which are circumferentially distributed at equal intervals, each of the water inlet seats 62 is radially opposite to one of the water outlet seats 61, and each of the water inlet seats 62 is provided with a water inlet valve 64. The valve seat 6 is correspondingly connected with the pump head 1. The water outlet cavity 8 is formed between the interior of the water outlet zone 65 and the pump head 1, and the water outlet seats 61 are positioned in the water outlet cavity 8. The water inlet cavity 7 is formed between an exterior of the water outlet zone 65 and the pump head 1, and the water inlet seats 62 are positioned in the water inlet cavity 7.

[0039] In this embodiment, the pump head 1, the pump seat 2 and the motor 5 are locked and fixed into a whole by a plurality of connecting screws a which are circumferentially distributed at intervals.

[0040] As such, a pipe is connected to the water inlet 71 and placed into liquid. The motor 5 is energized, such that the motor 5 rotates to drive the swing support 3 to rotate, so as to allow the diaphragm 4 to swing up and down, such that the liquid is pumped up from the water inlet 71, discharged from the water outlet valves 63 after passing through the water inlet valves 64, and finally flows out from the water outlet 81.

[0041] In view of the problem in the prior art that it is difficult to suction the viscous liquid, the structure of the valve seat 6 is improved in the present invention, without increasing the current and the power of the motor 5.

[0042] As shown in FIG. 4 to FIG. 6, in the structure of the valve seat 6 of the diaphragm pump according to the present invention, each of the water inlet seats 62 of the valve seat 6 is provided with a mounting hole 622 and water inlet holes 621. Each of the water inlet valves 64 comprises a water inlet valve plate 641 and a water inlet valve stem 642 which are connected to each other. The water inlet valve stem 642 is mounted to the mounting hole 622, and the water inlet valve plate 641 is of a bowl-shaped structure for movably opening and closing the water inlet holes 621.

[0043] Each of the water inlet valve plates 641 is positioned on a front side of the corresponding water inlet seat 62. A guide base 67 is provided at a back side of the each of the water inlet seats 62, and each of the guide bases 67 is mounted in the corresponding mounting hole 622 in a reciprocating sliding manner. A first end of each of the water inlet valve stems 642 is fixedly connected to the corresponding water inlet valve plate 641, and a second end of each of the water inlet valve stems penetrates into and is fixed in an intermediate connecting hole 671 of the guide base 67 in the corresponding mounting hole 622. Each of the water inlet valves 64 can slide in the corresponding mounting hole 622 along with the guide base 67 in a reciprocating manner.

[0044] A first end of the each of the guide bases 67, which is distant from the corresponding water inlet valve plate 641, extends out of the corresponding mounting hole 622 and is provided with a radially protruding restricting portion 672. Each of the guide bases 67 is sleeved with a pressure spring 68, and two ends of the pressure spring 68 respectively abut against the restricting portion 672 and an edge of the corresponding mounting hole 622 on the back side of the corresponding water inlet seat 62. The pressure springs 68 are arranged to push the water inlet valves 64 toward the back sides of the water inlet seats 62, such that the water inlet valve plates 641 of the water inlet valves 64 abut tightly against the water inlet holes 621 on the front sides of the water inlet seats 62 to block and close the water inlet holes 621.

[0045] As such, by providing the pressure springs 68 and the slidable guide bases 67, the water inlet valve stems 642 in the prior art which are clamped with the water inlet seats 62 are changed to slidingly fit with the water inlet seats 62 and abutted by the pressure springs 68, such that the water inlet holes 621 can be opened more easily when viscous liquid is suctioned. Specifically, when the water inlet cavity 7 (pressure-free cavity) is filled with viscous liquid, as the conventional water inlet valve plate in the prior art is fixed and has a circular edge, the generated stress is too large, and the conventional water inlet valve plate can be adsorbed by the viscous liquid in a pressure-free state, such that the diaphragm pump always runs idle. Now, the water inlet valve stems which are clamped with the water inlet sets are configured to be in sliding fit with each of the mounting holes 622, such that when viscous liquid is suctioned, each of the water inlet valve plates 641 can slide towards a direction away from the water inlet 71 as a whole. Meanwhile, each of the water inlet valve plates 641 can deform as a whole to open the corresponding water inlet holes 621, such that the viscous liquid can be suctioned from the water inlet valves 64 through the water inlet holes 621 more easily, and then discharged from the water outlet cavity 8 and the water outlet 81 through the water outlet valves 63. Therefore, the problem that the viscous liquid is difficult to be suctioned is solved. Meanwhile, each of the guide bases 67 and the corresponding water inlet valve 64 can be reset by the corresponding pressure spring 68.

[0046] As shown in FIG. 6, in order to facilitate the sliding of each of the water inlet valves 64, in this embodiment, an outer wall of the corresponding guide base 67 is in clearance fit with an inner wall of the corresponding mounting hole 622; a blocking ring 69 is arranged between the pressure spring 68 and the edge of the mounting hole 622 to ensure that no small particles or impurities circulate in a gap between the outer wall of the guide base 67 and the inner wall of the mounting hole 622, thereby preventing jamming and disruption of the normal operation of the water inlet valve 64. Specifically, the blocking ring 69 is pressed by the pressure spring 68 and abuts tightly against the edge of the mounting hole 622. In addition, an inner ring edge 691 of the blocking ring 69 is elastically fitted to the outer wall of the guide base 67, such that the inner ring edge 691 of the blocking ring 69 can swing along with the up-and-down sliding of the guide base 67, and a portion of the liquid without impurities can enter the gap during the swinging process of the inner ring edge 691, such that the gap between the guide base 67 and the mounting hole 622 can be lubricated to reduce friction, and the heat generated by friction can be taken away.

[0047] As shown in FIG. 6, in this embodiment, an annular mounting protruding ring 6221 protrudes from the edge of each of the mounting holes 622, an annular groove 692 is recessed on each of the blocking rings 69, and the annular groove 692 is fitted into the corresponding mounting protruding ring 6221 to facilitate convenient mounting of the blocking ring 69. Meanwhile, each of the blocking rings 69 is accurately positioned and fitted into the corresponding mounting protruding ring 6221 with the compression of the corresponding pressure spring 68, such that the blocking ring 69 is prevented from deviating in the sliding process of the corresponding guide base 67.

[0048] As shown in FIG. 6, the intermediate connecting hole 671 of each of the guide bases 67 penetrates both ends of the guide base 67, and the corresponding water inlet valve stem 642 penetrates the intermediate connecting hole 671. An annular slot 6421 is formed on each of the water inlet valve stems 642, an annular clamping block 6711 is provided in the intermediate connecting hole 671 of each of the guide bases 67, and the annular clamping block 6711 is clamped in the corresponding annular slot 6421. The annular clamping block 6711 may be formed by radially protruding from an inner wall of the intermediate connecting hole 671, and may be interference-fitted in the position of the annular slot 6421, so as to prevent the water inlet valve stem 642 and the guide base 67 from slipping off.

[0049] As shown in FIG. 4, each of the mounting holes 622 is arranged in a middle part of the corresponding water inlet seat 62, and there are a plurality of the water inlet holes 621 that are distributed around the mounting hole 622. The middle part of the valve seat 6 is provided with the water outlet seats 61, and the valve seat 6 is provided with the water inlet seats 62 at the periphery of the water outlet seats 61. Each of the water outlet seats 61 is provided with water outlet holes 611, and each of the water outlet valves 63 is mounted on the corresponding water outlet seat 61 for movably opening and closing the water outlet holes 611.

[0050] In addition, the front side of each of the water inlet seats 62 which is adjacent to the corresponding water inlet valve plate 641 is a concave surface 623, and each of the water inlet valve plates 641 is in an inverted bowl shape to correspond to the concave surface 623.

[0051] In order to avoid excessive pressure in the water outlet cavity 8 of the diaphragm pump, a pressure relief channel 9 is further provided in the pump head 1 to protect the product.

[0052] Referring to FIG. 3 and FIG. 7, the pressure relief channel 9 and a pressure blocking cavity 11 are further provided in the pump head 1. A first end of the pressure relief channel 9 is communicated with the water inlet 71, and a second end of the pressure relief channel is provided with a communication hole 91. The communication hole 91 is communicated with the pressure blocking cavity 11, and the pressure blocking cavity 11 is provided with a pressure hole 111 at a side of the communication hole 91 for communicating with the water outlet 81. An elastic diaphragm 121 and a diaphragm spring 122 are provided in the pressure blocking cavity 11, and the elastic diaphragm 121 is abutted by the diaphragm spring 122 to synchronously and movably block the communication hole 91 and the pressure hole 111. Therefore, since the water outlet cavity 8 is communicated with the water outlet 81, when the pressure in the water outlet cavity 8 is too high, the elastic diaphragm 121 can be pushed up from the pressure hole 111, such that a portion of the liquid can flow from the communication hole 91 to the water inlet 71 through the pressure relief channel 9, thereby realizing pressure relief protection.

[0053] Specifically, the water inlet 71 and the water outlet 81 are separately arranged at two sides of the top of the pump head 1. The pressure relief channel 9 is transversely arranged between the water inlet 71 and the water outlet 81, and the communication hole 91 is arranged on the top of the pressure relief channel 9. The top surface of the pump head 1 is concavely provided with the pressure blocking cavity 11, and the bottom of the pressure blocking cavity 11 vertically faces the communication hole 91 and the pressure hole 111. The top of the pressure blocking cavity 11 is in locked closure by a mounting plate 13. The diaphragm spring 122 is mounted in the pressure blocking cavity 11, and two ends of the diaphragm spring 122 abut against the mounting plate 13 and the elastic diaphragm 121 respectively. Therefore, when the pressure of the liquid flowing from the water outlet cavity 8 to the water outlet 81 is too high, the elastic diaphragm 121 is pushed up against the elastic force of the diaphragm spring 122, thereby communicating the water outlet and the water inlet via the pressure relief channel 9, such that the liquid flows back to the water inlet 71 for pressure relief protection.

[0054] Meanwhile, according to the requirements of the working environment, a one-way valve component 10 can be mounted on the water outlet 81, such that the liquid in the water outlet 81 can only flow out in one direction, and cannot flow into the diaphragm pump in a reverse direction, while the pressure in the output pipeline is maintained.

[0055] Specifically, the one-way valve component 10 can be mounted on a water outlet channel 14 inside the water outlet 81. The peripheral wall of the one-way valve component 10 is provided with an annular sealing ring 101, and is in sealing fit with the water outlet channel 14 through the annular sealing ring 101. An inner end of the one-way valve component 10 distant from the water outlet 81 is further provided with a number of elastic hooks 102 protruding radially outward. In this embodiment, the one-way valve component is provided with four elastic hooks 102 which are circumferentially and uniformly distributed on the outer wall of the inner end of the one-way valve component 10 at intervals. The inner side of the water outlet channel 14 is provided with a radially concave mounting slot 141.

[0056] Therefore, the one-way valve component 10 is mounted inward from the water outlet 81, and is clamped in the mounting slot 141 in the inner side of the water outlet channel 14 by the elastic hooks 102. The mounting is convenient and quick, and the one-way valve component 10 is fixed by the mounting slot 141, such that the one-way valve component cannot move in the water outlet channel 14.

[0057] In summary, in the structures of the diaphragm pump and the valve seat 6 of the present invention, the water inlet valve stem 642 with fixed structure in the prior art is changed into a sliding water inlet valve stem 642, such that in the suctioning of the viscous liquid, the problem that the water inlet valve plate 641 is difficult to open can be overcome without increasing the current of the motor 5, etc., so as to prevent shortening of the service life of the motor 5, increase the service life of the product, and realize high flow volume, high pressure, and pumping of viscous liquid.

Examples

Embodiment Construction

[0036]As shown in FIG. 1 to FIG. 3, the diaphragm pump of the present invention comprises a pump head 1, a pump seat 2, a swing support 3, a diaphragm 4, a motor 5, and a valve seat 6.

[0037]The pump head 1, the pump seat 2 and the motor 5 are connected in sequence. The motor 5 is mounted below the pump seat 2, and one end of the motor 5 penetrates into the pump seat 2 and is mounted with the swing support 3. The valve seat 6 is arranged between the pump head 1 and the pump seat 2 and above the swing support 3. The diaphragm 4 is positioned between the valve seat 6 and the swing support 3. A water inlet cavity 7 and a water outlet cavity 8 are formed between the pump head 1 and the valve seat 6, and the pump head 1 is provided with a water inlet 71 communicated with the water inlet cavity 7 and a water outlet 81 communicated with the water outlet cavity 8.

[0038]In this embodiment, a middle part of the valve seat 6 is provided with a water outlet zone 65, and the water outlet zone 65 ...

DESCRIPTIONBackground of the Invention

[0001] The present invention relates to a diaphragm pump.

[0002] The diaphragm pump is a new type of conveying machinery, which generally includes a pump head, a pump seat, a valve seat, a diaphragm, a swing support, a motor, and other components. The diaphragm pump can convey common liquids or various corrosive liquids, liquids with particles, liquids with high viscosity, volatility, flammability, and toxicity, etc. At present, with a rapid development of agricultural automation, people are becoming increasingly interested in using the diaphragm pump to realize automation of agricultural irrigation. Since the diaphragm pumps on the market have insufficient suction force when pumping viscous liquid fertilizer, there is a need for a diaphragm pump with a large flow and a high pressure, which can pump viscous liquid.

[0003] A water inlet valve of an existing diaphragm pump generally adopts a fixed structure, which mainly functions through a negative pressure generated by the movement of the diaphragm in the pump body that deforms a bowl-shaped water inlet valve plate of the fixed water inlet valve so as to open a water inlet hole. However, due to a large adsorption force of viscous liquid on the bowl-shaped water inlet valve plate, the diaphragm pump has insufficient suction force when suctioning the viscous liquid.

[0004] A common solution is to increase the flow and the suction pressure by increasing the power of the motor, such that the diaphragm pump has a good trafficability. However, a high motor speed will definitely result in a large current, and thus a large amount of heat generated by the motor, such that the service life of the motor is short, which will lead to a decrease of the service life of the diaphragm pump, a need for frequent replacement and maintenance, and an increase in the cost.

[0005] There is a diaphragm pump and a diaphragm pump pressure spring valve as disclosed in Chinese Patent Publication No. CN203614385U, where the piston is provided as a thick rubber seal for wear resistance, and in order to prevent the rubber seal from being unable to seal with the valve cavity, a compression spring is sleeved between the piston guide rod and the mounting hole. In this solution, the gland and the piston guide rod are screwed into a whole, such that the piston guide rod needs to be made of a hard material so as to ensure the threaded connection.

[0006] However, the long-term reciprocating movement of the piston is still likely to separate the threads between the gland and the piston guide rod, resulting in a short service life of the diaphragm pump. In addition, since the piston guide rod is made of the hard material but the piston needs to be made of a flexible material, the piston in this solution adopts a structure that one end of the piston guide rod is coated with the piston by injection molding, resulting in a large overall thickness of the piston.

[0007] Therefore, when the piston opens the water inlet hole, the edge of the piston cannot deform to open the water inlet hole, and the opening of the water inlet hole can only be realized by driving the piston guide rod to slide by a long course, such that the current of the motor needs to be increased, the power of the motor is increased, and the service life of the motor is shortened. In summary, the diaphragm pump in this solution is not suitable for suctioning the viscous liquid.

[0008] In view of the above, the present invention provides a novel valve seat structure of diaphragm pump and a diaphragm pump, so as to solve the above problems and the defects of the existing structure.BRIEF SUMMARY OF THE INVENTION

[0009] The present invention intends to provide a valve seat structure of diaphragm pump and a diaphragm pump, which have the advantages of convenience in pumping viscous liquid, long service life, and low cost.

[0010] To attain the above objects, the present invention has the following technical solutions:

[0011] A valve seat structure for a diaphragm pump, comprising a water inlet seat provided in a valve seat; a water inlet valve mounted in the water inlet seat;

[0012] the water inlet seat is provided with a mounting hole and a water inlet hole; the water inlet valve comprises a water inlet valve plate and a water inlet valve stem which are connected to each other; the water inlet valve stem is mounted to the mounting hole, and the water inlet valve plate is of a bowl-shaped structure for movably opening and closing the water inlet hole;

[0013] the water inlet valve plate is positioned on a front side of the water inlet seat; a guide base is provided at a back side of the water inlet seat; the guide base is mounted in the mounting hole in a reciprocating sliding manner; the water inlet valve stem has a first end which is fixedly connected to the water inlet valve plate and a second end which penetrates into and is fixed in an intermediate connecting hole of the guide base in the mounting hole;

[0014] the guide base has a first end which is distant from the water inlet valve plate; the first end of the guide base extends out of the mounting hole and is provided with a radially protruding restricting portion;

[0015] the guide base is sleeved with a pressure spring, and two ends of the pressure spring respectively abut against the restricting portion and an edge of the mounting hole on the back side of the water inlet seat.

[0016] Furthermore, an outer wall of the guide base is in clearance fit with an inner wall of the mounting hole; a blocking ring is arranged between the pressure spring and the edge of the mounting hole; the blocking ring is pressed by the pressure spring and abuts tightly against the edge of the mounting hole, and an inner ring edge of the blocking ring is elastically fitted to the outer wall of the guide base.

[0017] Furthermore, an annular mounting protruding ring protrudes from the edge of the mounting hole; an annular groove is recessed on the blocking ring; the annular groove is fitted into the mounting protruding ring.

[0018] Furthermore, the intermediate connecting hole of the guide base penetrates both ends of the guide base, and the water inlet valve stem penetrates the intermediate connecting hole; an annular slot is formed on the water inlet valve stem; an annular clamping block is provided in the intermediate connecting hole of the guide base; the annular clamping block is clamped in the annular slot.

[0019] Furthermore, the mounting hole is arranged in a middle part of the water inlet seat; a plurality of the water inlet holes are provided and the plurality of water inlet holes are distributed around the mounting hole.

[0020] Furthermore, the front side of the water inlet seat which is adjacent to the water inlet valve plate is a concave surface, and the water inlet valve plate is in an inverted bowl shape to correspond to the concave surface.

[0021] The present invention further provides a diaphragm pump, comprising a pump head, a pump seat, a swing support, a diaphragm, a motor and the aforementioned valve seat structure; the pump head, the pump seat and the motor are connected in sequence; the motor is mounted below the pump seat; one end of the motor penetrates into the pump seat and is mounted with the swing support; the valve seat is arranged between the pump head and the pump seat and above the swing support; the diaphragm is positioned between the valve seat and the swing support; a water inlet cavity and a water outlet cavity are formed between the pump head and the valve seat, and the pump head is provided with a water inlet communicated with the water inlet cavity and a water outlet communicated with the water outlet cavity.

[0022] Furthermore, a middle part of the valve seat is provided with a water outlet zone, and the water outlet zone is defined by an annular wall protruding from a top of the valve seat; an interior of the water outlet zone is provided with five water outlet seats which are circumferentially distributed at equal intervals; a periphery of the water outlet zone is provided with five water inlet seats which are circumferentially distributed at equal intervals, each of the water inlet seats is radially opposite to one of the water outlet seats; the valve seat is correspondingly connected with the pump head; the water outlet cavity is formed between the interior of the water outlet zone and the pump head; the water inlet cavity is formed between an exterior of the water outlet zone and the pump head.

[0023] Furthermore, a pressure relief channel and a pressure blocking cavity are further provided in the pump head; a first end of the pressure relief channel is communicated with the water inlet, and a second end of the pressure relief channel is provided with a communication hole; the communication hole is communicated with the pressure blocking cavity, and the pressure blocking cavity is provided with a pressure hole at a side of the communication hole for communicating with the water outlet; an elastic diaphragm and a diaphragm spring are provided in the pressure blocking cavity, and the elastic diaphragm is abutted by the diaphragm spring to synchronously and movably block the communication hole and the pressure hole.

[0024] Furthermore, the water inlet and the water outlet are separately arranged at two sides of the top of the pump head; the pressure relief channel is transversely arranged between the water inlet and the water outlet, and the communication hole is arranged on the top of the pressure relief channel; the top surface of the pump head is concavely provided with the pressure blocking cavity, and the bottom of the pressure blocking cavity vertically faces the communication hole and the pressure hole; the top of the pressure blocking cavity is in locked closure by the mounting plate; the diaphragm spring is mounted in the pressure blocking cavity, and two ends of the diaphragm spring abut against the mounting plate and the elastic diaphragm respectively.

[0025] Furthermore, the pump head, the pump seat and the motor are locked and fixed into a whole by a plurality of connecting screws which are circumferentially distributed at intervals.

[0026] Furthermore, a one-way valve component is mounted on a water outlet channel inside the water outlet; a peripheral wall of the one-way valve component is provided with an annular sealing ring, and is in sealing fit with the water outlet channel through the annular sealing ring; an inner end of the one-way valve component distant from the water outlet is further provided with a number of elastic hooks protruding radially outward; an inner side of the water outlet channel is provided with a radially concave mounting slot; the one-way valve component is mounted inward from the water outlet, and is clamped in the mounting slot in the inner side of the water outlet channel by the elastic hooks.

[0027] By adopting the above technical solutions, in the diaphragm pump and the valve seat structure of the present invention, the water inlet valve stem with fixed structure in the prior art is changed into a sliding water inlet valve stem, such that in the suctioning of the viscous liquid, the problem that the water inlet valve plate is difficult to open can be overcome; at the same time, the pressure spring can reset the guide base and the water inlet valve; it is not necessary to increase the current of the motor, etc., so as to prevent shortening of the service life of the motor, increase the service life of the product, and realize high flow volume, high pressure, and pumping of viscous liquid.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a perspective diagram of a diaphragm pump according to an embodiment of the present invention;

[0029] FIG. 2 is an exploded view of a diaphragm pump according to an embodiment of the present invention;

[0030] FIG. 3 is a sectional view of a diaphragm pump according to an embodiment of the present invention;

[0031] FIG. 4 is an exploded view of a valve seat according to an embodiment of the present invention;

[0032] FIG. 5 is a schematic view of a water inlet valve according to an embodiment of the present invention;

[0033] FIG. 6 is a sectional view of a valve seat according to an embodiment of the present invention;

[0034] FIG. 7 is a sectional view of a pump head according to an embodiment of the present invention.

[0035] Description of reference numerals: a pump head 1, a pressure blocking cavity 11, a pressure hole 111, an elastic diaphragm 121, a diaphragm spring 122, a mounting plate 13, a water outlet channel 14, a mounting slot 141, a pump seat 2, a swing support 3, a diaphragm 4, a motor 5, a valve seat 6, a water outlet seat 61, a water outlet hole 611, a water inlet seat 62, a water inlet hole 621, a mounting hole 622, a mounting protruding ring 6221, an arc concave surface 623, a water outlet valve 63, a water inlet valve 64, a water inlet valve plate 641, a water inlet valve stem 642, an annular slot 6421, a water outlet zone 65, an annular wall 66, a guide base 67, an intermediate connecting hole 671, an annular clamping block 6711, a restricting portion 672, a pressure spring 68, a blocking ring 69, an inner ring edge 691, an annular groove 692, a water inlet cavity 7, a water inlet 71, a water outlet cavity 8, a water outlet 81, a pressure relief channel 9, a communication hole 91, a one-way valve component 10, an annular sealing ring 101, an elastic hook 102, and a connecting screw a.DETAILED DESCRIPTION OF THE INVENTION

[0036] As shown in FIG. 1 to FIG. 3, the diaphragm pump of the present invention comprises a pump head 1, a pump seat 2, a swing support 3, a diaphragm 4, a motor 5, and a valve seat 6.

[0037] The pump head 1, the pump seat 2 and the motor 5 are connected in sequence. The motor 5 is mounted below the pump seat 2, and one end of the motor 5 penetrates into the pump seat 2 and is mounted with the swing support 3. The valve seat 6 is arranged between the pump head 1 and the pump seat 2 and above the swing support 3. The diaphragm 4 is positioned between the valve seat 6 and the swing support 3. A water inlet cavity 7 and a water outlet cavity 8 are formed between the pump head 1 and the valve seat 6, and the pump head 1 is provided with a water inlet 71 communicated with the water inlet cavity 7 and a water outlet 81 communicated with the water outlet cavity 8.

[0038] In this embodiment, a middle part of the valve seat 6 is provided with a water outlet zone 65, and the water outlet zone 65 is defined by an annular wall 66 protruding from a top of the valve seat 6. An interior of the water outlet zone 65 is provided with five water outlet seats 61 which are circumferentially distributed at equal intervals, and each of the water outlet seats 61 is provided with a water outlet valve 63. A periphery of the water outlet zone 65 is provided with five water inlet seats 62 which are circumferentially distributed at equal intervals, each of the water inlet seats 62 is radially opposite to one of the water outlet seats 61, and each of the water inlet seats 62 is provided with a water inlet valve 64. The valve seat 6 is correspondingly connected with the pump head 1. The water outlet cavity 8 is formed between the interior of the water outlet zone 65 and the pump head 1, and the water outlet seats 61 are positioned in the water outlet cavity 8. The water inlet cavity 7 is formed between an exterior of the water outlet zone 65 and the pump head 1, and the water inlet seats 62 are positioned in the water inlet cavity 7.

[0039] In this embodiment, the pump head 1, the pump seat 2 and the motor 5 are locked and fixed into a whole by a plurality of connecting screws a which are circumferentially distributed at intervals.

[0040] As such, a pipe is connected to the water inlet 71 and placed into liquid. The motor 5 is energized, such that the motor 5 rotates to drive the swing support 3 to rotate, so as to allow the diaphragm 4 to swing up and down, such that the liquid is pumped up from the water inlet 71, discharged from the water outlet valves 63 after passing through the water inlet valves 64, and finally flows out from the water outlet 81.

[0041] In view of the problem in the prior art that it is difficult to suction the viscous liquid, the structure of the valve seat 6 is improved in the present invention, without increasing the current and the power of the motor 5.

[0042] As shown in FIG. 4 to FIG. 6, in the structure of the valve seat 6 of the diaphragm pump according to the present invention, each of the water inlet seats 62 of the valve seat 6 is provided with a mounting hole 622 and water inlet holes 621. Each of the water inlet valves 64 comprises a water inlet valve plate 641 and a water inlet valve stem 642 which are connected to each other. The water inlet valve stem 642 is mounted to the mounting hole 622, and the water inlet valve plate 641 is of a bowl-shaped structure for movably opening and closing the water inlet holes 621.

[0043] Each of the water inlet valve plates 641 is positioned on a front side of the corresponding water inlet seat 62. A guide base 67 is provided at a back side of the each of the water inlet seats 62, and each of the guide bases 67 is mounted in the corresponding mounting hole 622 in a reciprocating sliding manner. A first end of each of the water inlet valve stems 642 is fixedly connected to the corresponding water inlet valve plate 641, and a second end of each of the water inlet valve stems penetrates into and is fixed in an intermediate connecting hole 671 of the guide base 67 in the corresponding mounting hole 622. Each of the water inlet valves 64 can slide in the corresponding mounting hole 622 along with the guide base 67 in a reciprocating manner.

[0044] A first end of the each of the guide bases 67, which is distant from the corresponding water inlet valve plate 641, extends out of the corresponding mounting hole 622 and is provided with a radially protruding restricting portion 672. Each of the guide bases 67 is sleeved with a pressure spring 68, and two ends of the pressure spring 68 respectively abut against the restricting portion 672 and an edge of the corresponding mounting hole 622 on the back side of the corresponding water inlet seat 62. The pressure springs 68 are arranged to push the water inlet valves 64 toward the back sides of the water inlet seats 62, such that the water inlet valve plates 641 of the water inlet valves 64 abut tightly against the water inlet holes 621 on the front sides of the water inlet seats 62 to block and close the water inlet holes 621.

[0045] As such, by providing the pressure springs 68 and the slidable guide bases 67, the water inlet valve stems 642 in the prior art which are clamped with the water inlet seats 62 are changed to slidingly fit with the water inlet seats 62 and abutted by the pressure springs 68, such that the water inlet holes 621 can be opened more easily when viscous liquid is suctioned. Specifically, when the water inlet cavity 7 (pressure-free cavity) is filled with viscous liquid, as the conventional water inlet valve plate in the prior art is fixed and has a circular edge, the generated stress is too large, and the conventional water inlet valve plate can be adsorbed by the viscous liquid in a pressure-free state, such that the diaphragm pump always runs idle. Now, the water inlet valve stems which are clamped with the water inlet sets are configured to be in sliding fit with each of the mounting holes 622, such that when viscous liquid is suctioned, each of the water inlet valve plates 641 can slide towards a direction away from the water inlet 71 as a whole. Meanwhile, each of the water inlet valve plates 641 can deform as a whole to open the corresponding water inlet holes 621, such that the viscous liquid can be suctioned from the water inlet valves 64 through the water inlet holes 621 more easily, and then discharged from the water outlet cavity 8 and the water outlet 81 through the water outlet valves 63. Therefore, the problem that the viscous liquid is difficult to be suctioned is solved. Meanwhile, each of the guide bases 67 and the corresponding water inlet valve 64 can be reset by the corresponding pressure spring 68.

[0046] As shown in FIG. 6, in order to facilitate the sliding of each of the water inlet valves 64, in this embodiment, an outer wall of the corresponding guide base 67 is in clearance fit with an inner wall of the corresponding mounting hole 622; a blocking ring 69 is arranged between the pressure spring 68 and the edge of the mounting hole 622 to ensure that no small particles or impurities circulate in a gap between the outer wall of the guide base 67 and the inner wall of the mounting hole 622, thereby preventing jamming and disruption of the normal operation of the water inlet valve 64. Specifically, the blocking ring 69 is pressed by the pressure spring 68 and abuts tightly against the edge of the mounting hole 622. In addition, an inner ring edge 691 of the blocking ring 69 is elastically fitted to the outer wall of the guide base 67, such that the inner ring edge 691 of the blocking ring 69 can swing along with the up-and-down sliding of the guide base 67, and a portion of the liquid without impurities can enter the gap during the swinging process of the inner ring edge 691, such that the gap between the guide base 67 and the mounting hole 622 can be lubricated to reduce friction, and the heat generated by friction can be taken away.

[0047] As shown in FIG. 6, in this embodiment, an annular mounting protruding ring 6221 protrudes from the edge of each of the mounting holes 622, an annular groove 692 is recessed on each of the blocking rings 69, and the annular groove 692 is fitted into the corresponding mounting protruding ring 6221 to facilitate convenient mounting of the blocking ring 69. Meanwhile, each of the blocking rings 69 is accurately positioned and fitted into the corresponding mounting protruding ring 6221 with the compression of the corresponding pressure spring 68, such that the blocking ring 69 is prevented from deviating in the sliding process of the corresponding guide base 67.

[0048] As shown in FIG. 6, the intermediate connecting hole 671 of each of the guide bases 67 penetrates both ends of the guide base 67, and the corresponding water inlet valve stem 642 penetrates the intermediate connecting hole 671. An annular slot 6421 is formed on each of the water inlet valve stems 642, an annular clamping block 6711 is provided in the intermediate connecting hole 671 of each of the guide bases 67, and the annular clamping block 6711 is clamped in the corresponding annular slot 6421. The annular clamping block 6711 may be formed by radially protruding from an inner wall of the intermediate connecting hole 671, and may be interference-fitted in the position of the annular slot 6421, so as to prevent the water inlet valve stem 642 and the guide base 67 from slipping off.

[0049] As shown in FIG. 4, each of the mounting holes 622 is arranged in a middle part of the corresponding water inlet seat 62, and there are a plurality of the water inlet holes 621 that are distributed around the mounting hole 622. The middle part of the valve seat 6 is provided with the water outlet seats 61, and the valve seat 6 is provided with the water inlet seats 62 at the periphery of the water outlet seats 61. Each of the water outlet seats 61 is provided with water outlet holes 611, and each of the water outlet valves 63 is mounted on the corresponding water outlet seat 61 for movably opening and closing the water outlet holes 611.

[0050] In addition, the front side of each of the water inlet seats 62 which is adjacent to the corresponding water inlet valve plate 641 is a concave surface 623, and each of the water inlet valve plates 641 is in an inverted bowl shape to correspond to the concave surface 623.

[0051] In order to avoid excessive pressure in the water outlet cavity 8 of the diaphragm pump, a pressure relief channel 9 is further provided in the pump head 1 to protect the product.

[0052] Referring to FIG. 3 and FIG. 7, the pressure relief channel 9 and a pressure blocking cavity 11 are further provided in the pump head 1. A first end of the pressure relief channel 9 is communicated with the water inlet 71, and a second end of the pressure relief channel is provided with a communication hole 91. The communication hole 91 is communicated with the pressure blocking cavity 11, and the pressure blocking cavity 11 is provided with a pressure hole 111 at a side of the communication hole 91 for communicating with the water outlet 81. An elastic diaphragm 121 and a diaphragm spring 122 are provided in the pressure blocking cavity 11, and the elastic diaphragm 121 is abutted by the diaphragm spring 122 to synchronously and movably block the communication hole 91 and the pressure hole 111. Therefore, since the water outlet cavity 8 is communicated with the water outlet 81, when the pressure in the water outlet cavity 8 is too high, the elastic diaphragm 121 can be pushed up from the pressure hole 111, such that a portion of the liquid can flow from the communication hole 91 to the water inlet 71 through the pressure relief channel 9, thereby realizing pressure relief protection.

[0053] Specifically, the water inlet 71 and the water outlet 81 are separately arranged at two sides of the top of the pump head 1. The pressure relief channel 9 is transversely arranged between the water inlet 71 and the water outlet 81, and the communication hole 91 is arranged on the top of the pressure relief channel 9. The top surface of the pump head 1 is concavely provided with the pressure blocking cavity 11, and the bottom of the pressure blocking cavity 11 vertically faces the communication hole 91 and the pressure hole 111. The top of the pressure blocking cavity 11 is in locked closure by a mounting plate 13. The diaphragm spring 122 is mounted in the pressure blocking cavity 11, and two ends of the diaphragm spring 122 abut against the mounting plate 13 and the elastic diaphragm 121 respectively. Therefore, when the pressure of the liquid flowing from the water outlet cavity 8 to the water outlet 81 is too high, the elastic diaphragm 121 is pushed up against the elastic force of the diaphragm spring 122, thereby communicating the water outlet and the water inlet via the pressure relief channel 9, such that the liquid flows back to the water inlet 71 for pressure relief protection.

[0054] Meanwhile, according to the requirements of the working environment, a one-way valve component 10 can be mounted on the water outlet 81, such that the liquid in the water outlet 81 can only flow out in one direction, and cannot flow into the diaphragm pump in a reverse direction, while the pressure in the output pipeline is maintained.

[0055] Specifically, the one-way valve component 10 can be mounted on a water outlet channel 14 inside the water outlet 81. The peripheral wall of the one-way valve component 10 is provided with an annular sealing ring 101, and is in sealing fit with the water outlet channel 14 through the annular sealing ring 101. An inner end of the one-way valve component 10 distant from the water outlet 81 is further provided with a number of elastic hooks 102 protruding radially outward. In this embodiment, the one-way valve component is provided with four elastic hooks 102 which are circumferentially and uniformly distributed on the outer wall of the inner end of the one-way valve component 10 at intervals. The inner side of the water outlet channel 14 is provided with a radially concave mounting slot 141.

[0056] Therefore, the one-way valve component 10 is mounted inward from the water outlet 81, and is clamped in the mounting slot 141 in the inner side of the water outlet channel 14 by the elastic hooks 102. The mounting is convenient and quick, and the one-way valve component 10 is fixed by the mounting slot 141, such that the one-way valve component cannot move in the water outlet channel 14.

[0057] In summary, in the structures of the diaphragm pump and the valve seat 6 of the present invention, the water inlet valve stem 642 with fixed structure in the prior art is changed into a sliding water inlet valve stem 642, such that in the suctioning of the viscous liquid, the problem that the water inlet valve plate 641 is difficult to open can be overcome without increasing the current of the motor 5, etc., so as to prevent shortening of the service life of the motor 5, increase the service life of the product, and realize high flow volume, high pressure, and pumping of viscous liquid.

Examples

Embodiment Construction

[0036]As shown in FIG. 1 to FIG. 3, the diaphragm pump of the present invention comprises a pump head 1, a pump seat 2, a swing support 3, a diaphragm 4, a motor 5, and a valve seat 6.

[0037]The pump head 1, the pump seat 2 and the motor 5 are connected in sequence. The motor 5 is mounted below the pump seat 2, and one end of the motor 5 penetrates into the pump seat 2 and is mounted with the swing support 3. The valve seat 6 is arranged between the pump head 1 and the pump seat 2 and above the swing support 3. The diaphragm 4 is positioned between the valve seat 6 and the swing support 3. A water inlet cavity 7 and a water outlet cavity 8 are formed between the pump head 1 and the valve seat 6, and the pump head 1 is provided with a water inlet 71 communicated with the water inlet cavity 7 and a water outlet 81 communicated with the water outlet cavity 8.

[0038]In this embodiment, a middle part of the valve seat 6 is provided with a water outlet zone 65, and the water outlet zone 65 ...

Claims

1. A valve seat structure of a diaphragm pump, comprising:a water inlet seat provided in a valve seat; a water inlet valve mounted in the water inlet seat;the water inlet seat is provided with a mounting hole and a water inlet hole; the water inlet valve comprises a water inlet valve plate and a water inlet valve stem which are connected to each other; the water inlet valve stem is mounted to the mounting hole, and the water inlet valve plate is of a bowl-shaped structure for movably opening and closing the water inlet hole;the water inlet valve plate is positioned on a front side of the water inlet seat; a guide base is provided at a back side of the water inlet seat; the guide base is mounted in the mounting hole in a reciprocating sliding manner; the water inlet valve stem has a first end which is fixedly connected to the water inlet valve plate and a second end which penetrates into and is fixed in an intermediate connecting hole of the guide base in the mounting hole;the guide base has a first end which is distant from the water inlet valve plate; the first end of the guide base extends out of the mounting hole and is provided with a radially protruding restricting portion;the guide base is sleeved with a pressure spring, and two ends of the pressure spring respectively abut against the restricting portion and an edge of the mounting hole on the back side of the water inlet seat.

2. The valve seat structure of the diaphragm pump of claim 1, wherein an outer wall of the guide base is in clearance fit with an inner wall of the mounting hole; a blocking ring is arranged between the pressure spring and the edge of the mounting hole; the blocking ring is pressed by the pressure spring and abuts tightly against the edge of the mounting hole, and an inner ring edge of the blocking ring is elastically fitted to the outer wall of the guide base.

3. The valve seat structure of the diaphragm pump of claim 2, wherein an annular mounting protruding ring protrudes from the edge of the mounting hole; an annular groove is recessed on the blocking ring; the annular groove is fitted into the mounting protruding ring.

4. The valve seat structure of the diaphragm pump of claim 1, wherein the intermediate connecting hole of the guide base penetrates both ends of the guide base, and the water inlet valve stem penetrates the intermediate connecting hole; an annular slot is formed on the water inlet valve stem; an annular clamping block is provided in the intermediate connecting hole of the guide base; the annular clamping block is clamped in the annular slot.

5. The valve seat structure of the diaphragm pump of claim 1, wherein the mounting hole is arranged in a middle part of the water inlet seat; a plurality of the water inlet holes are provided and the plurality of water inlet holes are distributed around the mounting hole.

6. The valve seat structure of the diaphragm pump of claim 1, wherein the front side of the water inlet seat which is adjacent to the water inlet valve plate is a concave surface, and the water inlet valve plate is in an inverted bowl shape to correspond to the concave surface.

7. A diaphragm pump, comprising a pump head, a pump seat, a swing support, a diaphragm, a motor and the valve seat structure of claim 1; the pump head, the pump seat and the motor are connected in sequence; the motor is mounted below the pump seat; one end of the motor penetrates into the pump seat and is mounted with the swing support; the valve seat is arranged between the pump head and the pump seat and above the swing support; the diaphragm is positioned between the valve seat and the swing support; a water inlet cavity and a water outlet cavity are formed between the pump head and the valve seat, and the pump head is provided with a water inlet communicated with the water inlet cavity and a water outlet communicated with the water outlet cavity.

8. The diaphragm pump of claim 7, wherein a middle part of the valve seat is provided with a water outlet zone, and the water outlet zone is defined by an annular wall protruding from a top of the valve seat; an interior of the water outlet zone is provided with five water outlet seats which are circumferentially distributed at equal intervals; a periphery of the water outlet zone is provided with five water inlet seats which are circumferentially distributed at equal intervals, each of the water inlet seats is radially opposite to one of the water outlet seats; the valve seat is correspondingly connected with the pump head; the water outlet cavity is formed between the interior of the water outlet zone and the pump head; the water inlet cavity is formed between an exterior of the water outlet zone and the pump head.

9. The diaphragm pump of claim 7, wherein a pressure relief channel and a pressure blocking cavity are further provided in the pump head; a first end of the pressure relief channel is communicated with the water inlet, and a second end of the pressure relief channel is provided with a communication hole; the communication hole is communicated with the pressure blocking cavity, and the pressure blocking cavity is provided with a pressure hole at a side of the communication hole for communicating with the water outlet; an elastic diaphragm and a diaphragm spring are provided in the pressure blocking cavity, and the elastic diaphragm is abutted by the diaphragm spring to synchronously and movably block the communication hole and the pressure hole.

10. The diaphragm pump of claim 7, wherein a one-way valve component is mounted on a water outlet channel inside the water outlet; a peripheral wall of the one-way valve component is provided with an annular sealing ring, and is in sealing fit with the water outlet channel through the annular sealing ring; an inner end of the one-way valve component distant from the water outlet is further provided with a number of elastic hooks protruding radially outward; an inner side of the water outlet channel is provided with a radially concave mounting slot; the one-way valve component is mounted inward from the water outlet, and is clamped in the mounting slot in the inner side of the water outlet channel by the elastic hooks.

11. The diaphragm pump of claim 7, wherein an outer wall of the guide base is in clearance fit with an inner wall of the mounting hole; a blocking ring is arranged between the pressure spring and the edge of the mounting hole; the blocking ring is pressed by the pressure spring and abuts tightly against the edge of the mounting hole, and an inner ring edge of the blocking ring is elastically fitted to the outer wall of the guide base.

12. The diaphragm pump of claim 11, wherein an annular mounting protruding ring protrudes from the edge of the mounting hole; an annular groove is recessed on the blocking ring; the annular groove is fitted into the mounting protruding ring.

13. The diaphragm pump of claim 7, wherein the intermediate connecting hole of the guide base penetrates both ends of the guide base, and the water inlet valve stem penetrates the intermediate connecting hole; an annular slot is formed on the water inlet valve stem; an annular clamping block is provided in the intermediate connecting hole of the guide base; the annular clamping block is clamped in the annular slot.

14. The diaphragm pump of claim 7, wherein the mounting hole is arranged in a middle part of the water inlet seat; a plurality of the water inlet holes are provided and the plurality of water inlet holes are distributed around the mounting hole.

15. The diaphragm pump of claim 7, wherein the front side of the water inlet seat which is adjacent to the water inlet valve plate is a concave surface, and the water inlet valve plate is in an inverted bowl shape to correspond to the concave surface.

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