Jet flow structure of self-priming centrifugal pump

Abstract

The utility model provides a jet flow structure of a self-priming centrifugal pump, and belongs to the technical field of water pumps. The problem that an existing jet flow structure is poor in stability is solved. The self-absorption centrifugal pump jet flow structure comprises a shell and a bowl type valve made of rubber materials, a nozzle is arranged at the upper end of the shell, a horizontally-arranged barrel is arranged at the lower end of the shell, the bowl type valve is arranged in the barrel, the front end of the bowl type valve extends out of the barrel, a cover plate is fixed to the rear end of the barrel, and the rear end of the bowl type valve is clamped between the cover plate and the barrel and seals a rear end opening of the barrel. The cover plate is provided with a center hole penetrating front and back, a sliding rod made of metal materials is arranged in the center hole in a front-back sliding mode, the front end of the sliding rod extends into the middle of the bowl-type valve, the sliding rod and the bowl-type valve form a whole in an injection molding mode, and the rear end of the sliding rod extends out of the center hole. The jet flow structure of the self-priming centrifugal pump is stable.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, and relates to a self-priming centrifugal pump, and more particularly to a self-priming centrifugal pump jet structure. Background Technology

[0002] A self-priming centrifugal pump is a centrifugal pump that, except for the first start-up which requires priming, does not require priming upon subsequent starts. It can automatically extract gas from the suction pipe and transport liquid normally.

[0003] The structure of existing self-priming centrifugal pumps is as disclosed in the Chinese Patent Database as a fast self-priming jet centrifugal pump (application number: 200910181231.6). The pump shaft is mounted in the bearing housing, and the impeller is mounted on the pump shaft and in the pressure chamber. When the impeller rotates at high speed, the liquid in the pressure chamber is forced into the pump body's liquid storage chamber. The liquid flows into the pump body's return hole. Since the pressure cup valve in the pump body's liquid storage chamber is open, the liquid enters the return pipe and flows to the jet nozzle. Due to the high-speed jet ejected from the nozzle, a strong entrainment effect is generated on the gas at the impeller inlet. Water and gas are entrained to the impeller inlet. This process is repeated to drain the air from the pump inlet pipe and discharge it from the exhaust valve. The liquid flows out from the outlet pipe, and the pump works normally.

[0004] With technological advancements, to facilitate manual operation of cup valves, an operating rod is now often formed on one side of the valve and extends outwards. However, since current cup valves are generally made of rubber, there is a risk of breakage when the operating rod is pulled to force pressure movement, affecting its usability. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a structurally stable self-priming centrifugal pump jet structure.

[0006] The purpose of this utility model can be achieved through the following technical solution: a self-priming centrifugal pump jet structure, including a shell and a cup valve made of rubber material. The upper end of the shell is a nozzle, and the lower end of the shell is a horizontally arranged cylinder. The cup valve is arranged in the cylinder, with the front end of the cup valve extending out of the cylinder. A cover plate is fixed to the rear end of the cylinder. The rear end of the cup valve is clamped between the cover plate and the cylinder and closes the rear port of the cylinder. The cover plate has a central hole that extends through the front and rear. The feature is that a slide rod made of metal material is slidably arranged in the central hole. The front end of the slide rod extends into the middle of the cup valve, and the slide rod and the cup valve are formed into a whole by injection molding. The rear end of the slide rod extends out of the central hole.

[0007] The slide bar is made of metal, and the front end of the slide bar is injection molded as a whole with the cup valve to effectively enhance the connection stability and strength of the slide bar and the cup valve. This not only effectively prevents the slide bar and the cup valve from separating, but also enhances the sliding accuracy and stability of the cup valve, thereby greatly improving the working stability of this jet structure.

[0008] In the aforementioned self-priming centrifugal pump jet structure, an annular groove is formed on the outer wall of the front end of the slide rod, and the annular groove is coaxially arranged with the slide rod; the cup valve extends into the annular groove to form a positioning ring that matches the annular groove. The positioning ring cooperates with the annular groove to strengthen the connection between the slide rod and the cup valve in the axial direction, making the jet structure operate more stably.

[0009] In the above-mentioned self-priming centrifugal pump jet structure, the axial cross-section of the positioning ring is arc-shaped, which facilitates the forming of the positioning ring and reduces the processing difficulty.

[0010] In the above-mentioned self-priming centrifugal pump jet structure, there are at least two annular grooves distributed along the axis of the slide bar, and each annular groove is provided with the aforementioned positioning ring to further strengthen the connection strength between the slide bar and the cup valve.

[0011] In the aforementioned self-priming centrifugal pump jet structure, a guide ring is formed on the rear side of the cover plate. The guide ring is fitted over the slide rod, and the outer wall of the slide rod contacts and fits against the inner wall of the guide ring. The guide ring is provided to enhance the support of the slide rod and ensure stable sliding of the cup valve.

[0012] In the above-mentioned self-priming centrifugal pump jet structure, the slide bar includes a straight rod-shaped main body, and an annular limiting seat is formed on the outer wall of the main body. The outer wall of the limiting seat contacts and fits with the inner wall of the guide ring, and the limiting seat can press on the rear side of the cover plate to limit the forward movement distance of the cup valve, prevent the cup valve from being excessively deformed during operation, and enhance the service life of the cup valve.

[0013] Compared with existing technologies, the jet structure of this self-priming centrifugal pump has the following advantages:

[0014] 1. The slide bar is made of metal material, and the front end of the slide bar is injection molded into the cup valve as a whole to effectively enhance the connection stability and strength of the slide bar and the cup valve. This not only effectively prevents the slide bar and the cup valve from separating, but also enhances the sliding accuracy and stability of the cup valve, thereby greatly improving the working stability of this jet structure.

[0015] 2. The positioning ring and the annular groove cooperate to strengthen the connection between the slide rod and the cup valve in the axial direction, so that the jet structure can operate more stably. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the jet structure of this self-priming centrifugal pump.

[0017] Figure 2 This is a schematic diagram of the slide bar structure.

[0018] In the figure, 1 is the shell; 1a is the nozzle; 1b is the cylinder; 2 is the cup valve; 2a is the positioning ring; 3 is the cover plate; 3a is the guide ring; 4 is the slide rod; 4a is the annular groove; and 4b is the limit seat. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] like Figure 1 As shown, the self-priming centrifugal pump jet structure includes a housing 1 and a cup valve 2. The housing 1 is a one-piece structure, with a nozzle 1a at the upper end and a horizontally arranged cylinder 1b at the lower end, and the lower end of the nozzle 1a is connected to the inner cavity of the cylinder 1b; the cup valve 2 is a one-piece rubber component, with cup-shaped structures at both ends and a solid columnar structure in the middle.

[0021] Specifically

[0022] like Figure 1 As shown, the bowl valve 2 is horizontally installed inside the cylinder 1b, with its front end extending out of the cylinder 1b. A cover plate 3 is fixed to the rear end of the cylinder 1b, and the rear end of the bowl valve 2 is clamped between the cover plate 3 and the cylinder 1b, sealing the rear port of the cylinder 1b. In use, under pressure, the bowl valve 2 is compressed backward, causing its front end to move backward and seal the front port of the cylinder 1b.

[0023] The cover plate 3 has a central hole that extends through the entire structure from front to back, and the central hole is coaxial with the cylinder 1b. A slide rod 4 made of metal is slidably mounted inside the central hole. The front end of the slide rod 4 extends into the middle of the cup valve 2, and the slide rod 4 and the cup valve 2 are formed as a whole by injection molding. The rear end of the slide rod 4 extends out of the central hole. The slide rod 4 can be made of stainless steel, aluminum alloy, or other materials.

[0024] The slide rod 4 is made of metal, and the front end of the slide rod 4 is injection molded as a whole with the cup valve 2 to effectively enhance the connection stability and strength of the slide rod 4 and the cup valve 2. This not only effectively prevents the slide rod 4 and the cup valve 2 from separating, but also enhances the sliding accuracy and stability of the cup valve 2, thereby greatly improving the working stability of this jet structure.

[0025] To further explain, such as Figure 1 and Figure 2 As shown, an annular groove 4a is formed on the outer wall of the front end of the slide rod 4, and the annular groove 4a is coaxially arranged with the slide rod 4; the cup valve 2 extends into the annular groove 4a to form a positioning ring 2a that matches the annular groove 4a. The positioning ring 2a cooperates with the annular groove 4a to strengthen the connection between the slide rod 4 and the cup valve 2 in the axial direction, making the jet structure operate more stably. Preferably, the axial cross section of the positioning ring 2a is arc-shaped, which is beneficial to the forming of the positioning ring 2a and reduces the processing difficulty.

[0026] Furthermore, there are at least two annular grooves 4a distributed along the axial direction of the slide rod 4, and each annular groove 4a is provided with the aforementioned positioning ring 2a to further strengthen the connection between the slide rod 4 and the cup valve 2. Preferably, there are two annular grooves 4a.

[0027] like Figure 1 As shown, a guide ring 3a is integrally formed on the rear side of the cover plate 3. The guide ring 3a is sleeved on the outside of the slide rod 4, and the outer wall of the slide rod 4 contacts and cooperates with the inner wall of the guide ring 3a. The guide ring 3a is provided to strengthen the support of the slide rod 4 and ensure the stable sliding of the cup valve 2. The slide rod 4 includes a straight rod-shaped main body, and an annular limiting seat 4b is integrally formed on the outer wall of the main body. The outer wall of the limiting seat 4b contacts and cooperates with the inner wall of the guide ring 3a, and the limiting seat 4b can press against the rear side of the cover plate 3 to limit the forward movement distance of the cup valve 2, prevent the cup valve 2 from being excessively deformed during operation, and enhance the service life of the cup valve 2.

[0028] In the actual product, the outer wall of the main body and the inner wall of the central hole, as well as the inner wall of the guide ring 3a and the outer wall of the limit seat 4b, are all connected by circumferential surface contact.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A self-priming centrifugal pump jet structure, comprising a housing (1) and a cup-shaped valve (2) made of rubber material, wherein the upper end of the housing (1) is a nozzle (1a), the lower end of the housing (1) is a horizontally arranged cylinder (1b), the cup-shaped valve (2) is disposed inside the cylinder (1b), the front end of the cup-shaped valve (2) extends out of the cylinder (1b), a cover plate (3) is fixed to the rear end of the cylinder (1b), the rear end of the cup-shaped valve (2) is clamped between the cover plate (3) and the cylinder (1b) and closes the rear port of the cylinder (1b), the cover plate (3) has a central hole arranged through the front and rear, characterized in that, A slide rod (4) made of metal material is slidably installed in the center hole. The front end of the slide rod (4) extends into the middle of the cup valve (2), and the slide rod (4) and the cup valve (2) are formed into a whole by injection molding. The rear end of the slide rod (4) extends out of the center hole.

2. The self-priming centrifugal pump jet structure according to claim 1, characterized in that, An annular groove (4a) is provided on the outer wall of the front end of the slide rod (4), and the annular groove (4a) is coaxially arranged with the slide rod (4); the cup valve (2) extends into the annular groove (4a) to form a positioning ring (2a) that matches the annular groove (4a).

3. The self-priming centrifugal pump jet structure according to claim 2, characterized in that, The axial cross section of the positioning ring (2a) is circular arc-shaped.

4. The self-priming centrifugal pump jet structure according to claim 2 or 3, characterized in that, There are at least two annular grooves (4a) distributed along the axial direction of the slide bar (4), and each annular groove (4a) is provided with the aforementioned positioning ring (2a).

5. The self-priming centrifugal pump jet structure according to claim 1, characterized in that, A guide ring (3a) is formed on the rear side of the cover plate (3). The guide ring (3a) is sleeved on the outside of the slide rod (4), and the outer wall of the slide rod (4) is in contact with the inner wall of the guide ring (3a).

6. The self-priming centrifugal pump jet structure according to claim 5, characterized in that, The slide bar (4) includes a straight rod-shaped main body, and an annular limiting seat (4b) is formed on the outer wall of the main body. The outer wall of the limiting seat (4b) contacts and cooperates with the inner wall of the guide ring (3a), and the limiting seat (4b) can press on the rear side of the cover plate (3).

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