A water inlet valve

Abstract

The utility model relates to a water inlet valve, including first valve body, second valve body, third valve body, negative pressure valve cover, pressure reducing subassembly, solenoid valve control assembly, negative pressure valve control assembly: second valve body has first connecting ring body, second connecting ring body, first connecting ring body center axle is perpendicular to second connecting ring body center axle and is connected in the side of second connecting ring body, first connecting ring body links to each other with first valve body and forms pressure reducing control cavity, second connecting ring body upper end links to each other with solenoid valve control assembly and forms solenoid valve control valve cavity, second connecting ring body lower end links to each other with third valve body and forms negative pressure valve upper valve cavity, the utility model discloses through the special structure design of second valve body, realizes in the valve body subassembly of small and clever compact along the fluid direction and sets up pressure reducing subassembly, solenoid valve control assembly, negative pressure valve control assembly in proper order, guarantees the water pressure of pumping to be low water pressure or no water pressure, forms water inlet double -sealed structure simultaneously, satisfies higher functional requirement and space requirement.

Description

Technical Field

[0001] This utility model relates to a water inlet valve. Background Technology

[0002] A negative pressure valve provides the necessary water flow to a drinking water heating system. The supply pressure is unlimited, but no water flows out if there is no negative pressure at the outlet. The negative pressure generated by the water pump draws water from the pressurized supply end, and water flow stops immediately when there is no negative pressure at the outlet. The flow rate is determined by the negative pressure at the outlet (pump speed - flow rate). This can replace the water tank in drinking water equipment, operating in a fully sealed manner to prevent contamination of drinking water by bacteria in the air. For example, patent CN202222974778.5 describes a mechanical negative pressure inlet valve, including a valve body with an inlet and an outlet. The valve body contains a sealing port, a sealing head, a sealing diaphragm, and a spring. The valve body has a vent hole for connecting the atmospheric cavity to the outside. A transmission structure between the sealing head and the sealing diaphragm allows the sealing diaphragm to move upwards, which in turn moves the sealing head upwards. The transmission structure includes a push plate that works in conjunction with the sealing head, located above the sealing diaphragm, and a spring positioned between the push plate and the valve body. In operation, an external water pump connects to the outlet. During operation, negative pressure is generated, attracting the sealing diaphragm to extend and retract upwards. This movement, via a push plate, causes the sealing head to move upwards, thus connecting the inlet and outlet. The operating flow rate is determined by the external water pump's throughput, ensuring flow stability. However, in actual use, the negative pressure valve is susceptible to upstream water pressure fluctuations, leading to leakage. To address the unreliability caused by upstream water pressure fluctuations, existing technology installs a pressure-reducing valve upstream of the negative pressure valve in the water circuit to maintain a constant water pressure within the required range, and also incorporates a solenoid valve, creating a double-sealed inlet structure. This approach results in cumbersome pipe connections, numerous interfaces, more potential leakage points, and requires more space. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a water inlet valve.

[0004] The technical solution adopted by this utility model is as follows: A water inlet valve includes a valve body assembly, a pressure reducing assembly, a solenoid valve control assembly, and a negative pressure valve control assembly. The valve body assembly includes a first valve body, a second valve body, a third valve body, and a negative pressure valve cover connected in sequence. The first valve body is provided with an inlet pipe, and the third valve body is provided with an outlet pipe. The second valve body has a first connecting ring and a second connecting ring, wherein the central axis of the first connecting ring is perpendicular to the central axis of the second connecting ring and is connected to the side of the second connecting ring; The outer end of the first connecting ring forms a first connecting seat for docking with the first valve body. The first valve body is connected to the second valve body to form a pressure reducing control cavity. The first valve body is provided with a pressure reducing port that connects the water inlet pipe and the pressure reducing control cavity. The pressure reducing component is disposed in the pressure reducing control cavity and cooperates with the pressure reducing port. The upper end of the second connecting ring forms a second connecting seat for docking with the solenoid valve control assembly, and the lower end forms a third connecting seat for docking with the third valve body. The second connecting seat is connected to the solenoid valve control assembly to form a solenoid valve control chamber, and the third connecting seat is connected to the third valve body to form a negative pressure valve upper valve chamber. The second valve body is provided with a flow passage connecting the pressure reducing control chamber and the solenoid valve control chamber, and an electromagnetic control valve port connecting the solenoid valve control chamber and the negative pressure valve upper valve chamber. The solenoid valve control assembly cooperates with the electromagnetic control valve port to control the on / off state of the electromagnetic control valve port. The third valve body is connected to the negative pressure valve cover to form the lower valve chamber of the negative pressure valve. The water outlet pipe is connected to the lower valve chamber of the negative pressure valve. The third valve body is provided with a negative pressure control valve port that connects the upper valve chamber and the lower valve chamber of the negative pressure valve. The negative pressure valve control component works with the negative pressure control valve port to control the opening and closing of the negative pressure control valve port.

[0005] The water inlet pipe is aligned with the central axis of the pressure reducing port; the central axis of the pressure reducing port is perpendicular to the central axis of the electromagnetic control valve port; the central axis of the electromagnetic control valve port is aligned with the central axis of the negative pressure control valve port; the water outlet pipe is perpendicular to the central axis of the negative pressure control valve port.

[0006] The first valve body is provided with a first annular seat extending into the first connecting ring body, and the end of the first annular seat forms a pressure reducing port; the pressure reducing assembly includes a sliding block, a first spring, and a gasket. The sliding block is sleeved on the outside of the first annular seat and slides and seals with the outer circumference of the first annular seat. The outer circumferential wall of the sliding block slides and seals with the inner wall of the first connecting ring body. A gasket is fixed on the sliding block corresponding to the pressure reducing port. The two ends of the first spring abut against the first valve body and the sliding block respectively, so that under the pressure of the first spring, an adjustable gap is formed between the gasket and the pressure reducing port.

[0007] The sliding block includes a first sliding ring and a second sliding ring connected as one piece. The inner circumference of the first sliding ring is adapted to the outer circumference of the first annular seat and the first sliding ring is sleeved on the outside of the first annular seat. A first sealing ring is embedded on the outer circumference of the first annular seat to form a sliding sealing fit with the inner wall of the first sliding ring. The outer circumference of the second sliding ring is adapted to the inner wall of the first connecting ring. A second sealing ring is embedded on the outer circumference of the second sliding ring to form a sliding sealing fit with the inner wall of the first connecting ring. The outer diameter of the first sliding ring is smaller than the outer diameter of the second sliding ring. A first spring is sleeved on the outside of the first sliding ring and its two ends abut against the first valve body and the second sliding ring, respectively.

[0008] The second sliding ring is provided with a fixed plate, the fixed plate is provided with a gasket mounting groove and a first through hole at the bottom of the gasket mounting groove, the gasket is fixed in the gasket mounting groove, and a pressure relief channel is provided on the outer periphery of the fixed plate and the inner periphery of the second sliding ring.

[0009] The first valve body has a first mounting plate connected to the first connecting seat on the outer periphery of the part where the water inlet pipe and the first annular seat are connected. The first mounting plate is fastened to the first valve body by bolts. The first connecting seat of the first connecting ring body has two positioning grooves on two opposite sides. The first mounting plate has two positioning blocks with matching shapes. The two positioning blocks have different shapes.

[0010] The upper valve chamber of the negative pressure valve is equipped with a negative pressure valve plug and a second spring that drives the negative pressure valve plug to press against and close the negative pressure control valve port. The lower valve chamber of the negative pressure valve is equipped with a pneumatic diaphragm and a movable component. The pneumatic diaphragm isolates the lower valve chamber of the negative pressure valve into a medium chamber and an atmospheric chamber. The medium chamber is connected to the negative pressure control valve port and the water outlet pipe. The negative pressure valve cover is equipped with a vent that connects the atmospheric chamber to the outside air. The two ends of the movable component are respectively engaged with the pneumatic diaphragm and the negative pressure valve plug.

[0011] The upper surface of the bottom plate of the second connecting ring body is provided with an upwardly extending second annular seat, the upper end of which forms an electromagnetic control valve port; the lower surface of the bottom plate of the second connecting ring body is provided with a downwardly extending mating ring, which is inserted into the third valve body to form a plug-in fit and a sealed fit between the two.

[0012] The upper valve chamber of the negative pressure valve is equipped with a negative pressure valve plug and a second spring corresponding to the negative pressure control valve port; the lower valve chamber of the negative pressure valve is equipped with a pneumatic diaphragm and a movable component. The pneumatic diaphragm isolates the lower valve chamber of the negative pressure valve into a medium chamber and an atmospheric chamber. The medium chamber is connected to the negative pressure control valve port and the water outlet pipe. The negative pressure valve cover is equipped with a vent that connects the atmospheric chamber to the outside air. The two ends of the movable component are respectively engaged with the pneumatic diaphragm and the negative pressure valve plug; the second valve body is equipped with a spring limiting plate in the central flow channel. The outer peripheral wall of the spring limiting plate is spaced at a certain distance from the inner peripheral wall of the second valve body and the two are connected by several evenly distributed connecting ribs to form several flow holes; the upper end of the second spring abuts against the spring limiting plate and the lower end abuts against the negative pressure valve plug; the connecting ribs extend towards the negative pressure control valve port to form a limiting groove that fits the outer periphery of the negative pressure valve plug.

[0013] The pneumatic diaphragm includes a telescopic part, a bending part, and a mounting part connected sequentially from the inside to the outside. The mounting part is located between the third valve body and the negative pressure valve cover. The bending part protrudes towards the negative pressure valve cover. The movable part is provided with a movable disc that cooperates with the telescopic part and a circular skirt extending into the bending part is formed on the outer periphery of the movable disc. The movable disc is provided with a plurality of second through holes.

[0014] The beneficial effects of this utility model are as follows: Through the special structural design of the second valve body, this utility model realizes the sequential arrangement of pressure reducing component, solenoid valve control component, and negative pressure valve control component along the fluid direction within a small and compact valve body assembly. It adds a depressurization function on the basis of the original negative pressure valve to ensure that the upstream water pressure is constant within the customer's required range, reducing damage to the product and solving the problem of the impact of upstream water pressure fluctuations on the product. The solenoid valve in the middle controls the opening or closing of the water path, and the negative pressure valve downstream controls the opening or closing of the water path, ensuring that the water pressure sucked out by the pump is low or no water pressure. At the same time, it forms a double sealing structure for water inlet, meeting higher functional and space requirements. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 This is an exploded view of one embodiment of the present invention; Figure 3 This is a cross-sectional view of the internal structure of the decompression control cavity in one embodiment of the present invention; Figure 4 This is a cross-sectional view of the internal structure of the connecting part of the second valve body, the third valve body, and the negative pressure valve cover in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the second valve body in one embodiment of the present invention; Figure 6 This is a cross-sectional view of the second valve body in one embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the first valve body in one embodiment of the present invention; Figure 8 This is a cross-sectional view of the first valve body in one embodiment of the present invention; Figure 9 This is a cross-sectional view of the third valve body in one embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the movable component in one embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the pneumatic diaphragm in one embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of the negative pressure valve cover in one embodiment of the present invention; In the diagram, the components are: first valve body - 110, inlet pipe - 111, pressure reducing port - 112, first annular seat - 113, first mounting plate - 114, positioning block - 115, second valve body - 120, flow passage - 121, electromagnetic control valve port - 122, first connecting ring body - 123, positioning groove - 1231, second connecting ring body - 124, second annular seat - 1241, mating ring - 1242, spring limiting plate - 125, connecting rib - 126, flow hole - 127, connecting column - 128, third valve body - 130, outlet pipe - 131, negative pressure control valve port - 132, third annular seat - 133, negative pressure valve cover - 140, vent - 141; Sliding block-210, first sliding ring-211, second sliding ring-212, fixed plate-213, gasket mounting groove-2131, first through hole-2132, pressure relief channel-215, first spring-220, first sealing ring-230, second sealing ring-240, gasket-250; Solenoid valve control assembly-300; Negative pressure valve plug-410, second spring-420, pneumatic diaphragm-430, telescopic part-431, bending part-432, mounting part-433, moving part-440, push rod-441, moving plate-442, circular skirt-443, second through hole-444. Detailed Implementation

[0017] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0018] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0019] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0020] A type of inlet valve, such as Figure 1 , Figure 2 As shown, it includes a valve body assembly, a pressure reducing assembly, a solenoid valve control assembly (300), and a negative pressure valve control assembly.

[0021] The valve body assembly includes a first valve body (110), a second valve body (120), a third valve body (130), and a negative pressure valve cover (140) connected in sequence. The first valve body (110) is provided with an inlet pipe (111), and the third valve body (130) is provided with an outlet pipe (131). The first valve body (110) is connected to the second valve body (120) to form a pressure reducing control chamber. The inlet pipe (111) is connected to the pressure reducing control chamber. The second valve body (120) is connected to the solenoid valve control assembly (300) to form a solenoid valve control chamber. The second valve body (120) is connected to the third valve body (130) to form the upper valve chamber of the negative pressure valve. The third valve body (130) is connected to the negative pressure valve cover (140) to form the lower valve chamber of the negative pressure valve. The outlet pipe (131) is connected to the lower valve chamber of the negative pressure valve.

[0022] like Figure 2 As shown, the first valve body (110) is provided with a pressure reducing port (112) connecting the water inlet pipe (111) and the pressure reducing control chamber. The pressure reducing assembly is disposed in the pressure reducing control chamber and cooperates with the pressure reducing port (112); Figure 4 As shown, the second valve body (120) is provided with a flow passage (121) connecting the pressure reducing control chamber and the solenoid valve control chamber, and a solenoid control valve port (122) connecting the solenoid valve control chamber and the upper valve chamber of the negative pressure valve. The solenoid valve control assembly (300) cooperates with the solenoid control valve port (122) to control the opening and closing of the solenoid control valve port (122). The third valve body (130) is provided with a negative pressure control valve port (132) connecting the upper valve chamber of the negative pressure valve and the lower valve chamber of the negative pressure valve. The negative pressure valve control assembly cooperates with the negative pressure control valve port (132) to control the opening and closing of the negative pressure control valve port (132).

[0023] The water inlet pipe (111) is in the same direction as the central axis of the pressure reducing port (112); the central axis of the pressure reducing port (112) is perpendicular to the central axis of the electromagnetic control valve port (122); the central axis of the electromagnetic control valve port (122) is in the same direction as the central axis of the negative pressure control valve port (132); the water outlet pipe (131) is perpendicular to the central axis of the negative pressure control valve port (132).

[0024] Specifically, such as Figure 5 , Figure 6As shown, the second valve body (120) has a first connecting ring (123) and a second connecting ring (124). The central axis of the first connecting ring (123) is perpendicular to the central axis of the second connecting ring (124) and is connected to the side of the second connecting ring (124). The outer end of the first connecting ring (123) forms a first connecting seat for docking with the first valve body (110). The upper end of the second connecting ring (124) forms a second connecting seat for docking with the solenoid valve control assembly (300). The lower end of the second connecting ring (124) forms a third connecting seat for docking with the third valve body (130). The upper surface of the bottom plate of the second connecting ring body (124) is provided with an upwardly extending second annular seat (1241), the upper end of the second annular seat (1241) forms an electromagnetic control valve port (122); the lower surface of the bottom plate of the second connecting ring body (124) is provided with a downwardly extending mating ring (1242), the mating ring (1242) is inserted into the third valve body (130) to form a plug-in fit and a sealed fit between the two; the flow passage (121) is located at the position where the first connecting ring body (123) and the second connecting ring body (124) are connected and communicates with the outer cavity of the second annular seat (1241), the center of the flow passage (121) is coaxially arranged with the center of the first connecting ring body (123).

[0025] like Figure 7 As shown, the first valve body (110) has a first mounting plate (114) connected to a first connecting seat on the outer periphery of one end of the water inlet pipe (111). The first mounting plate (114) and the first valve body (110) are fastened together by bolts. The first valve body (110) has a first annular seat (113) protruding on the other side of the first mounting plate (114) opposite to the water inlet pipe (111). The first annular seat (113) extends into the first connecting ring body (123) and the end of the first annular seat (113) forms a pressure reducing port (112).

[0026] like Figure 3 As shown, the pressure-reducing assembly includes a sliding block (210), a first spring (220), a first sealing ring (230), a second sealing ring (240), and a gasket (250). Figure 8As shown, the sliding block (210) includes a first sliding ring (211) and a second sliding ring (212) connected as one piece. The inner circumference of the first sliding ring (211) is adapted to the outer circumference of the first annular seat (113), and the first sliding ring (211) is sleeved on the outside of the first annular seat (113). The first sealing ring (230) is embedded in the outer circumference of the first annular seat (113) and forms an effective sliding sealing fit with the inner wall of the first sliding ring (211). The outer circumference of the second sliding ring (212) is adapted to the inner wall of the first connecting ring body (123). The second sealing ring (240) is embedded in the outer circumference of the second sliding ring (212) and forms an effective sliding sealing fit with the inner wall of the first connecting ring body (123). A fixed plate (213) is provided inside the second sliding ring (212). A gasket (250) is fixed on the side of the fixed plate (213) facing the pressure reducing port (112), so that the gasket (250) cooperates with the pressure reducing port (112). A pressure reducing channel (215) is provided on the outer periphery of the fixed plate (213) and the inner periphery of the second sliding ring (212). The outer diameter of the first sliding ring (211) is smaller than the outer diameter of the second sliding ring (212). A first spring (220) is sleeved on the outside of the first sliding ring (211) and its two ends abut against the first mounting plate (114) and the second sliding ring (212) respectively. Under the pressure of the first spring (220), an adjustable gap is formed between the gasket (250) and the pressure reducing port (112). Through the structure of the above pressure reducing component, the front-end water pressure is kept constant within the customer's required range, reducing damage to the product and solving the problem of the impact of front-end water pressure fluctuations on the product.

[0027] like Figure 5 , Figure 6 As shown, the first connecting seat of the first connecting ring (123) is provided with two positioning grooves (1231) on two opposite sides, such as Figure 7 As shown, the first mounting plate (114) is provided with two matching positioning blocks (115). The two positioning blocks (115) have different shapes, so that the first valve body (110) and the second valve body (120) have a unique relative connection direction.

[0028] like Figure 8 , Figure 9 As shown, the fixing plate (213) is provided with a gasket mounting groove (2131) and a first through hole (2132) is provided at the bottom of the gasket mounting groove (2131) to facilitate the installation of the fixing gasket (250).

[0029] The solenoid valve control assembly (300) includes components such as an electromagnetic coil, an iron core, and a sealing plug. The change in electromagnetic field caused by the energization / de-energization of the electromagnetic coil drives the iron core to move the sealing plug, thereby blocking or removing the solenoid control valve port (122). The solenoid valve control assembly (300) is a conventional structure in the art, so its specific structure will not be described in detail.

[0030] The upper valve chamber of the negative pressure valve is provided with a negative pressure valve plug (410) corresponding to the negative pressure control valve port (132) and a second spring (420) that drives the negative pressure valve plug (410) to press and close the negative pressure control valve port (132). The lower valve chamber of the negative pressure valve is provided with a pneumatic diaphragm (430) and a movable part (440). The pneumatic diaphragm (430) isolates the lower valve chamber of the negative pressure valve into a medium chamber and an atmospheric chamber. The medium chamber is connected to the negative pressure control valve port (132) and the water outlet pipe (131). The negative pressure valve cover (140) is provided with a vent (141) that connects the atmospheric chamber to the outside air. The two ends of the movable part (440) are respectively engaged with the pneumatic diaphragm (430) and the negative pressure valve plug (410).

[0031] The second valve body (120) has a spring limiting plate (125) in the central flow channel. The outer peripheral wall of the spring limiting plate (125) is spaced apart from the inner peripheral wall of the second valve body (120) and the two are connected by several evenly distributed connecting ribs (126) to form several flow holes (127). The second spring (420) is a compression spring, and its upper end abuts against the spring limiting plate (125). The connecting ribs (126) extend toward the negative pressure control valve port (132) to form a limiting groove that fits the outer periphery of the negative pressure valve plug (410). In this embodiment, there are six connecting ribs (126), which are evenly distributed to form six flow holes (127) to reduce the vertical impact force of the water flow.

[0032] Furthermore, the second valve body (120) and the third valve body (130) are detachably connected by a plurality of threaded fasteners evenly distributed around the circumference. Specifically, as shown in... Figure 5 , Figure 6 As shown, the second valve body (120) has a plurality of connecting posts (128) extending along the central axis of the electromagnetic control valve port (122) and evenly distributed at equal intervals, forming a third connecting seat. The bottom of the connecting post (128) is provided with a connecting hole, and the third valve body (130) is provided with a plurality of second connecting holes. The threaded fastener passes through the second connecting hole and extends into the first connecting hole to be threadedly connected to the connecting post.

[0033] like Figure 10 As shown, the third valve body (130) is provided with a third annular seat (133), and the upper end of the third annular seat (133) forms a negative pressure control valve port (132); as Figure 6 As shown, the movable part (440) is provided with a top rod (441) that extends into the third annular seat (133).

[0034] like Figure 7 As shown, the pneumatic diaphragm (430) includes a telescopic part (431), a bending part (432), and a mounting part (433) connected sequentially from the inside to the outside. The mounting part (433) is located between the third valve body (130) and the negative pressure valve cover (140). The bending part (432) protrudes towards the negative pressure valve cover (140). The movable part (440) is provided with a movable disc (442) that cooperates with the telescopic part (431), and a circular skirt (443) extending into the bending part (432) is formed on the outer periphery of the movable disc (442). The movable disc (442) is provided with a plurality of second through holes (444). The circular skirt (443) on the outer periphery of the movable disc (442) is designed to match the diaphragm groove with a circular skirt to reduce the influence of water flow. The addition of four second through holes (444) on the movable disc (442) as water passage holes can reduce the noise and vibration caused by the downward pressure of water flow.

[0035] This application integrates a solenoid valve and a negative pressure valve into a single combined valve. A pressure reducing unit is installed upstream of the solenoid valve to ensure the upstream water pressure remains constant within the customer's required range, reducing damage to the product and resolving the impact of upstream water pressure fluctuations. The solenoid valve controls the flow of water in the middle, while the negative pressure valve controls the flow downstream, ensuring the pump draws out low or no water pressure. This forms a double-sealed inlet structure. The inlet solenoid valve needs to be energized to allow water flow into the upper valve chamber of the negative pressure valve, and then the pump at the outlet needs to operate to drive the moving part (440) to rise and open the negative pressure valve plug (410) to ensure unobstructed water flow. This perfectly solves the problem of leakage that may occur with prolonged use of the negative pressure valve; the original negative pressure valve would still resonate under certain operating conditions, which is perfectly resolved by combining the solenoid valve control; and a double-confirmation safety system is formed through mechanical and electromagnetic control.

[0036] The inlet pipe (111) and outlet pipe (131) are quick-connect straight-insertion pipes, which are convenient for connecting to pipelines. Quick-connect straight-insertion pipes are a conventional structure in this field, so the specific structure will not be described in detail.

[0037] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A water inlet valve, characterized in that: Includes valve body assembly, pressure reducing assembly, solenoid valve control assembly (300), and negative pressure valve control assembly: The valve body assembly includes a first valve body (110), a second valve body (120), a third valve body (130), and a negative pressure valve cover (140) connected in sequence. The first valve body (110) is provided with an inlet pipe (111), and the third valve body (130) is provided with an outlet pipe (131). The second valve body (120) has a first connecting ring body (123) and a second connecting ring body (124), wherein the central axis of the first connecting ring body (123) is perpendicular to the central axis of the second connecting ring body (124) and is connected to the side of the second connecting ring body (124); The outer end of the first connecting ring (123) forms a first connecting seat for docking with the first valve body (110). The first valve body (110) and the second valve body (120) are connected to form a pressure reducing control cavity. The first valve body (110) is provided with a pressure reducing port (112) that connects the water inlet pipe (111) and the pressure reducing control cavity. The pressure reducing assembly is disposed in the pressure reducing control cavity and cooperates with the pressure reducing port (112). The upper end of the second connecting ring (124) forms a second connecting seat for docking with the solenoid valve control assembly (300), and the lower end forms a third connecting seat for docking with the third valve body (130). The second connecting seat is connected to the solenoid valve control assembly (300) to form a solenoid valve control valve chamber, and the third connecting seat is connected to the third valve body (130) to form a negative pressure valve upper valve chamber. The second valve body (120) is provided with a flow passage (121) connecting the pressure reducing control chamber and the solenoid valve control valve chamber, and an electromagnetic control valve port (122) connecting the solenoid valve control valve chamber and the negative pressure valve upper valve chamber. The solenoid valve control assembly (300) cooperates with the electromagnetic control valve port (122) to control the opening and closing of the electromagnetic control valve port (122). The third valve body (130) is connected to the negative pressure valve cover (140) to form the lower valve chamber of the negative pressure valve. The water outlet pipe (131) is connected to the lower valve chamber of the negative pressure valve. The third valve body (130) is provided with a negative pressure control valve port (132) that connects the upper valve chamber and the lower valve chamber of the negative pressure valve. The negative pressure valve control component cooperates with the negative pressure control valve port (132) to control the opening and closing of the negative pressure control valve port (132).

2. The inlet valve according to claim 1, characterized in that: The water inlet pipe (111) is in the same direction as the central axis of the pressure reducing port (112); the central axis of the pressure reducing port (112) is perpendicular to the central axis of the electromagnetic control valve port (122); the central axis of the electromagnetic control valve port (122) is in the same direction as the central axis of the negative pressure control valve port (132); the water outlet pipe (131) is perpendicular to the central axis of the negative pressure control valve port (132).

3. The inlet valve according to claim 1 or 2, characterized in that: The first valve body (110) is provided with a first annular seat (113) extending into the first connecting ring body (123), and the end of the first annular seat (113) forms a pressure reducing port (112); the pressure reducing assembly includes a sliding block (210), a first spring (220), and a gasket (250). The sliding block (210) is sleeved on the outside of the first annular seat (113) and slides and seals with the outer periphery of the first annular seat (113). The outer periphery of the sliding block (210) slides and seals with the inner wall of the first connecting ring body (123). The gasket (250) is fixed on the sliding block (210) corresponding to the pressure reducing port (112). The two ends of the first spring (220) abut against the first valve body (110) and the sliding block (210) respectively, so that under the pressure of the first spring (220), an adjustable gap is formed between the gasket (250) and the pressure reducing port (112).

4. The inlet valve according to claim 3, characterized in that: The sliding block (210) includes a first sliding ring (211) and a second sliding ring (212) connected as one piece. The inner circumference of the first sliding ring (211) is adapted to the outer circumference of the first annular seat (113) and the first sliding ring (211) is sleeved on the outside of the first annular seat (113). The outer circumference of the first annular seat (113) is embedded with a first sealing ring (230) to form a sliding sealing fit with the inner wall of the first sliding ring (211). The outer circumference of the second sliding ring (212) is adapted to the inner wall of the first connecting ring body (123). The outer circumference of the second sliding ring (212) is embedded with a second sealing ring (240) to form a sliding sealing fit with the inner wall of the first connecting ring body (123). The outer diameter of the first sliding ring (211) is smaller than the outer diameter of the second sliding ring (212). The first spring (220) is sleeved on the outside of the first sliding ring (211) and its two ends abut against the first valve body (110) and the second sliding ring (212) respectively.

5. The inlet valve according to claim 4, characterized in that: The second sliding ring (212) is provided with a fixed plate (213), the fixed plate (213) is provided with a gasket mounting groove (2131) and a first through hole (2132) is provided at the bottom of the gasket mounting groove (2131). The gasket (250) is fixed in the gasket mounting groove (2131). The outer periphery of the fixed plate (213) and the inner periphery of the second sliding ring (212) are provided with a pressure relief channel (215).

6. The inlet valve according to claim 3, characterized in that: The first valve body (110) has a first mounting plate (114) connected to the first connecting seat on the outer periphery of the part where the water inlet pipe (111) and the first annular seat (113) are connected. The first mounting plate (114) and the first valve body (110) are fastened together by bolts. The first connecting seat of the first connecting ring body (123) has two positioning grooves (1231) on two opposite sides. The first mounting plate (114) has two positioning blocks (115) with matching shapes. The two positioning blocks (115) have different shapes.

7. The inlet valve according to claim 1 or 2, characterized in that: The upper valve chamber of the negative pressure valve is provided with a negative pressure valve plug (410) corresponding to the negative pressure control valve port (132) and a second spring (420) that drives the negative pressure valve plug (410) to press and close the negative pressure control valve port (132). The lower valve chamber of the negative pressure valve is provided with a pneumatic diaphragm (430) and a movable part (440). The pneumatic diaphragm (430) isolates the lower valve chamber of the negative pressure valve into a medium chamber and an atmospheric chamber. The medium chamber is connected to the negative pressure control valve port (132) and the water outlet pipe (131). The negative pressure valve cover (140) is provided with a vent (141) that connects the atmospheric chamber to the outside air. The two ends of the movable part (440) are respectively engaged with the pneumatic diaphragm (430) and the negative pressure valve plug (410).

8. The inlet valve according to claim 7, characterized in that: The upper surface of the bottom plate of the second connecting ring body (124) is provided with an upwardly extending second annular seat (1241), and the upper end of the second annular seat (1241) forms an electromagnetic control valve port (122); the lower surface of the bottom plate of the second connecting ring body (124) is provided with a downwardly extending mating ring (1242), and the mating ring (1242) is inserted into the third valve body (130) to form a plug-in fit and a sealed fit between the two.

9. The inlet valve according to claim 8, characterized in that: The upper valve chamber of the negative pressure valve is equipped with a negative pressure valve plug (410) and a second spring (420) corresponding to the negative pressure control valve port (132); the lower valve chamber of the negative pressure valve is equipped with a pneumatic diaphragm (430) and a movable part (440). The pneumatic diaphragm (430) isolates the lower valve chamber of the negative pressure valve into a medium chamber and an atmospheric chamber. The medium chamber is connected to the negative pressure control valve port (132) and the water outlet pipe (131). The negative pressure valve cover (140) is equipped with a vent (141) to connect the atmospheric chamber with the outside air. The two ends of the movable part (440) are respectively matched with the pneumatic diaphragm (430) and the negative pressure valve plug (410). The second valve body (120) is provided with a spring limiting plate (125) in the central flow channel. The outer peripheral wall of the spring limiting plate (125) and the inner peripheral wall of the second valve body (120) are separated by a certain distance and are connected by a number of evenly distributed connecting ribs (126) to form a number of flow holes (127). The upper end of the second spring (420) abuts against the spring limiting plate (125) and the lower end abuts against the negative pressure valve plug (410). The connecting ribs (126) extend towards the negative pressure control valve port (132) to form a limiting groove that is adapted to the outer periphery of the negative pressure valve plug (410).

10. The inlet valve according to claim 9, characterized in that: The pneumatic diaphragm (430) includes a telescopic part (431), a bending part (432), and a mounting part (433) connected sequentially from the inside to the outside. The mounting part (433) is located between the third valve body (130) and the negative pressure valve cover (140). The bending part (432) protrudes towards the negative pressure valve cover (140). The movable part (440) is provided with a movable disc (442) that cooperates with the telescopic part (431) and a circular skirt (443) extending into the bending part (432) is formed on the outer periphery of the movable disc (442). The movable disc (442) is provided with a plurality of second through holes (444).

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