Backflow prevention jet device

Abstract

The utility model provides an anti-backflow jet device which comprises a jet device body provided with a water inlet channel and a water outlet channel, a cavity of the water outlet channel is gradually expanded in the extending direction of the cavity, a movable plugging piece is arranged in the cavity, and the movable plugging piece is influenced by the acting force change of a medium in the water outlet channel. The movable plugging piece can move between a first position and a second position, and when the movable plugging piece moves to the second position, the movable plugging piece and the water outlet channel are clamped to achieve sealing of the water outlet channel. Based on the prior art, on the basis that an original jet device structure is not changed, the steel ball is arranged in the cavity of the water outlet passage, and the spherical surface of the steel ball is matched with the cavity of the water outlet passage, so that good sealing efficiency is achieved, and backflow water is prevented from impacting the water inlet passage and polluting the water inlet end.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bodies, in particular to an anti-backflow injector. Background Art

[0002] Intelligent toilets are sanitary facilities commonly used now. Compared with ordinary toilets, intelligent toilets have the following functions: such as hip washing, lower body washing, seat ring warming, warm air drying, automatic deodorization, etc. Among them, hip washing and lower body washing are realized by the cooperation of an injector and a nozzle in a fluid delivery pipeline for pressure flushing. However, since the nozzle is located inside the ceramic body and above the toilet bowl, even if it can be folded or retracted into the cover plate, it is still inevitably contaminated by splashed dirt. Coupled with the fact that a vacuum appears inside the fluid delivery pipeline at the moment when the water supply to the nozzle is cut off, it is extremely easy to cause the dirt to be sucked back into the nozzle and flow back through the water outlet passage, affecting the hygiene standard for secondary use. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide an anti-backflow injector to solve the technical problems in the above background.

[0004] To solve the above technical problems, the utility model provides an anti-backflow injector, which includes an injector body provided with a water inlet passage and a water outlet passage. The cavity of the water outlet passage gradually expands along its extending direction, and a movable plugging member is arranged therein. The movable plugging member moves between a first position and a second position under the influence of the change of the acting force of the medium in the water outlet passage.

[0005] When the movable plugging member moves to the first position, its lower surface is placed on the limit seat, the water outlet passage is opened, and the water flow enters the water outlet channel and then passes through the limit seat into the water outlet device.

[0006] When the movable plugging member moves to the second position, the movable plugging member engages with the water outlet channel against the extending direction of the water outlet channel to prevent the water flow in the water outlet passage from flowing back into the injector.

[0007] In a preferred embodiment: a constriction neck section is provided at one end of the water outlet passage close to its inlet, and the cavity size of the constriction neck section is smaller than the cavity size of the water outlet passage.

[0008] In a preferred embodiment: the cavity of the water outlet passage is conical, with its large mouth end facing outwards, and the limit seat is engaged on the large mouth end.

[0009] In a preferred embodiment: the limit seat includes a bottom cover covering the large mouth end of the water outlet passage, a top block supporting the movable plugging member, and an elastic rib plate connecting the bottom cover and the top block. A notch is provided on the bottom cover.

[0010] In a preferred embodiment: The elastic rib plates are arranged around the cavity of the water outlet passage at intervals. The elastic rib plate includes a first part that fits tightly with the side wall of the cavity of the water outlet passage, and a second part that connects the top block and the first part.

[0011] In a preferred embodiment: The slope of the second part is greater than that of the first part.

[0012] In a preferred embodiment: The movable plugging member is a steel ball.

[0013] In a preferred embodiment: The outlet size of the water inlet passage is smaller than the inlet size of the water outlet passage.

[0014] Compared with the prior art, the technical solution of the present utility model has the following beneficial effects:

[0015] Based on the prior art, without changing the structure of the original injector, the present utility model sets a steel ball in the cavity of the water outlet passage, and uses the spherical surface of the steel ball itself to fit with the cavity of the water outlet passage to achieve good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a plan view of the existing injector;

[0017] Figure 2 is a longitudinal sectional view of the existing injector

[0018] Figure 3 is a longitudinal sectional view of the movable plugging member in the first position in the injector of the present utility model;

[0019] Figure 4 is a longitudinal sectional view of the movable plugging member in the second position in the injector of the present utility model;

[0020] Figure 5 is an exploded view of the injector of the present utility model;

[0021] Figure 6 is a top view of the limit seat;

[0022] Figure 7 is a bottom view of the limit seat;

[0023] Figure 8 is a sectional view of the limit seat along its height direction;

[0024] Figure 9 is an installation and fitting diagram of the injector system of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] In the prior art, a jet injector is often provided in a water-using device to isolate the water source through air. Figure 1 - Figure 2 FIG. is a longitudinal sectional view of a jet injector commonly used in the current prior art. It can be seen from its illustrated structure that the jet injector includes two oppositely arranged water inlet passages 11 and water outlet passages 13, and a jet chamber 12 provided between the outlet of the water inlet passage 11 and the inlet of the water outlet passage 13. Since the water inlet passage 11, the jet chamber 12 and the water outlet passage 13 are connected in a through-air-blocking structure, when the nozzle connected to the water outlet passage 13 disconnects the water outlet instantaneously, due to the action of water gravity and the reverse force of the spray rod retraction at the water outlet end inside the water outlet passage 13, the residual water in the cavity is backsprayed into the water inlet passage 11, resulting in water source pollution.

[0029] In view of this, based on the structural characteristics of the existing jet injector, the present utility model proposes a backflow-preventing jet injector for preventing the water in the water outlet passage 13 from flowing back into the water tank. Refer to Figure 3 - Figure 9As shown in the figure, in addition to having the structural features of the above jet injector, it further includes a movable plugging member 131 and a limit seat 132. The limit seat 132 is in a limiting fit at the end of the water outlet channel against the extending direction of the cavity of the water outlet passage 13. The movable plugging member 131 is arranged in the cavity space enclosed by the limit seat 132 and the water outlet passage 13, and it can move between a first position and a second position under the influence of the change in the acting force of the medium in the water outlet passage 13. When the movable plugging member 131 moves to the first position, its lower surface abuts against the limit seat 132, the water outlet passage 13 is opened, and the water flow enters the water outlet channel and then passes through the notch on the limit seat 132 and enters the nozzle. When the movable plugging member 131 is subjected to the reverse acting force generated in the water outlet passage 13 and moves from the first position to the second position, at this time, the movable plugging member 131 engages with the wall surface of the water outlet channel against the extending direction of the water outlet channel, so as to prevent the problem of water source pollution caused by the backflow of the water flow in the water outlet passage 13.

[0030] In this embodiment, the outlet size of the water inlet passage 11 on the jet injector is set to be smaller than the inlet size of its water outlet passage 13, which can effectively improve the fluid flux in the jet injector. In addition, the structure of the water outlet channel is set to include a constriction neck section connected to one end of its inlet and a cavity connected to the constriction neck section. The cavity size of the water outlet channel gradually expands along its extending direction to form a conical opening, and the limit seat 132 is engaged in the end of the opening against the direction of the cavity opening.

[0031] Specifically, the limit seat 132 includes a bottom cover 1321 covering the end face of the flared opening, a top block 1323 supporting the movable plugging member 131, and elastic rib plates 1322 connecting the bottom cover 1321 and the top block 1323. Looking in detail, the elastic rib plates 1322 include a first part that is in interference fit with the inner wall of the cavity of the water outlet passage 13, and a second part with a slope greater than the first part, one end of which is connected to the top block 1323 and the other end is connected to the first part. Since the elastic rib plates 1322 are arranged around the cavity of the water outlet passage 13 at intervals and there is a notch on the bottom cover 1321, the interior of the limit seat 132 is in a space-emptied state. When the water column on the water inlet passage 11 is sprayed into the inlet of the water outlet channel through the jet chamber 12, at this time, the steel balls penetrating the cavity of the water outlet channel move in the extending direction of the cavity under the action of the water flow impact force until their lower surfaces abut against the top block 1323 of the limit seat 132. The moment the steel balls are disengaged from the cavity of the water outlet passage 13, the water outlet passage 13 is opened, and the water flow enters the water outlet channel and then passes through the limit seat 132 and enters the nozzle.

[0032] As mentioned above, it is only the preferred specific embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model who makes non-substantive modifications to the present utility model using this concept shall fall within the scope of infringement of the protection scope of the present utility model.

Claims

1. A reflux prevention injector, comprising an injector body provided with a water inlet passage and a water outlet passage, characterized in that: The cavity of the water outlet passage gradually expands along its extending direction, and an active blocking member is arranged therein. The active blocking member moves between a first position and a second position under the influence of the change of the acting force of the medium in the water outlet passage; When the active blocking member moves to the first position, its lower surface is placed on the limit seat, the water outlet passage is opened, and the water flow enters the water outlet device after passing through the limit seat; When the active blocking member moves to the second position, the active blocking member engages with the water outlet passage against the extending direction of the water outlet passage to prevent the water flow in the water outlet passage from flowing back into the ejector.

2. The anti-backflow injector according to claim 1, characterized in that: The water outlet passage is provided with a constriction neck section at one end near its inlet, and the cavity size of the constriction neck section is smaller than the cavity size of the water outlet passage.

3. The anti-backflow injector according to claim 2, wherein: The cavity of the water outlet passage is conical, with its large mouth end facing outward, and the limit seat is engaged on the large mouth end.

4. The anti-backflow injector according to claim 3, characterized in that: The limit seat includes a bottom cover covering the large mouth end of the water outlet passage, a top block supporting the active blocking member, and an elastic rib plate connecting the bottom cover and the top block. A notch is provided on the bottom cover.

5. The anti-backflow injector according to claim 4, characterized in that: The elastic rib plates are arranged around the cavity of the water outlet passage at intervals. The elastic rib plate includes a first part that is in interference fit with the side wall of the cavity of the water outlet passage, and a second part connecting the top block and the first part.

6. The anti-backflow ejector according to claim 5, characterized in that: The slope of the second part is greater than that of the first part.

7. The anti-backflow injector according to claim 1, characterized in that: The active blocking member is a steel ball.

8. The anti-backflow injector according to claim 1, wherein: The outlet size of the water inlet passage is smaller than the inlet size of the water outlet passage.

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