Pump head structure of injection pump

Abstract

The utility model discloses a pump head structure of an injection pump, which comprises a pump shell, a water inlet, an injection orifice, a water inlet cavity, a water outlet cavity and a communicating hole are arranged on the pump shell, a first flaring end of an injection venturi tube in the pump shell is communicated with a water through hole, a second flaring end of the injection venturi tube is communicated with the water outlet cavity, and a narrow end of a horn-shaped return pipe of the pump shell is opposite to the first flaring end; the rear end of the water outlet cavity is connected with a water return pipe which is communicated with the trumpet-shaped return pipe and is provided with a valve; the outer-layer liquid supplementing pipe is fixed to the inner wall of the pump shell, the first flaring end and the narrow opening end form a first water inlet channel, the second flaring end is inserted into the outer-layer liquid supplementing pipe, and a second water inlet channel is formed between the first flaring end and the second flaring end; the inner partition plate extends downwards from the inner top wall of the water inlet cavity to the upper portion of the first flaring end, and a check valve is arranged on the inner partition plate. Water and air in the water inlet cavity can enter the second water inlet channel through the check valve and cannot reversely flow back to the water inlet cavity, so that the air is rapidly pumped in the self-suction process, and the suction lift of the pump is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of jet pumps, and more specifically, to a pump head structure of a jet pump. Background Art

[0002] Jet self-priming pumps, such as CN109779912A - A jet pump, CN109538489A - Jet pump, have the characteristics of strong self-priming ability, high self-priming height, low net positive suction head, high shut-off head, and convenient use, and are widely used. The working principle of the jet self-priming pump is as follows: Before the water pump starts, the pump shell is filled with water first. After starting, the motor drives the impeller to rotate at high speed to generate high pressure, so that the water flow in the impeller channel flows towards the volute. At this time, a negative pressure is formed in the water inlet pipe and the jet conduit, and the air and liquid in the water inlet pipeline are sucked into the impeller through the water inlet pipe and the flared nozzle, and then return to the water outlet of the pump shell through the diversion groove in the guide cover. In order to facilitate the smooth flow of the diversion groove, a flow port is made for the diversion groove at the opening of the diversion groove, and the gas and liquid flow out through the flow port of the guide cover to the water outlet of the pump and are ejected.

[0003] The prior art, such as CN116641898A - A water pump with high self-priming performance and high efficiency, discloses that a water return pipe is connected to the rear end of the lower cavity wall of the water outlet cavity, the water return pipe is communicated with the flared jet nozzle, and a second valve is installed on the water return pipe. During self-priming, the second valve is opened to allow part of the water in the water outlet cavity to flow back to the flared jet nozzle through the water return pipe, that is, to let the high-pressure water flow to the negative pressure area to complete the self-priming of the water pump. When the water inlet pipe of the water pump is filled with water, the second valve is closed to block the high-pressure water from the negative pressure area. Therefore, the water pump changes from a jet pump (the power of the jet pump is 15% - 20%, up to 30%) to a centrifugal pump (the efficiency of the centrifugal pump is 50% - 70%, up to 85%), and the pumping efficiency of the water pump is greatly improved, and the water pump can maintain the operation mode of the centrifugal pump all the time after sucking up water.

[0004] However, during this process, due to the relatively small pressure of the water and air entering the second water inlet channel, the water and air in the second water inlet channel may flow back into the water inlet cavity, resulting in the inability to quickly pump out all the air and reducing the suction lift of the pump. In addition, it is necessary for the operator to constantly observe with the eyes whether the water inlet pipe is filled with water, which often leads to untimely closing of the second valve. After the pump shell completes self-priming, part of the water in the water outlet cavity (the inner cavity of the pump shell) still continuously flows back to the flared jet nozzle (the return cavity), that is, the high-pressure water continuously flows to the negative pressure area, causing the water to rotate and circulate in the pump shell, wasting the electric energy of the motor in vain, and also affecting the water outlet efficiency of the pump.

[0005] Therefore, how to provide a pump head structure that can improve the suction lift of the pump and can timely close the return cavity to improve the water outlet efficiency of the pump is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0006] In view of this, the present utility model provides a pump head structure that can increase the suction lift of the pump, can timely close the reflux chamber, and improve the water outlet efficiency of the pump.

[0007] In order to achieve the above object, the present utility model adopts the following technical solutions:

[0008] A pump head structure of a jet pump, comprising:

[0009] A pump housing, an inlet connected to a water inlet pipe and a jet port connected to a water outlet pipe are formed on the housing wall of the pump housing. An inlet chamber communicating with the inlet and an outlet chamber communicating with the jet port are provided inside the pump housing. A water passing hole for communicating the inlet chamber and the outlet chamber is formed on the inner wall of the pump housing. A jet venturi tube is detachably installed on the inner wall of the pump housing. The first flared end of the jet venturi tube communicates with the water passing hole, and the second flared end of the jet venturi tube communicates with the outlet chamber. A horn-shaped reflux tube communicating with the inlet chamber is provided at the rear side position corresponding to the water passing hole inside the pump housing. The narrow end of the horn-shaped reflux tube is arranged opposite to the first flared end;

[0010] A return pipe is connected to the rear end of the lower chamber wall of the outlet chamber. The return pipe communicates with the third flared end of the horn-shaped reflux tube, and a valve is installed on the return pipe;

[0011] An outer liquid supplement pipe is fixed on the inner wall of the pump housing. The first flared end and the narrow end are arranged at intervals, and a first water inlet channel is formed therebetween. The second flared end is inserted into the outer liquid supplement pipe, and a second water inlet channel is formed in the gap therebetween. The first water inlet channel and the second water inlet channel are both communicated with the inlet chamber, and the second water inlet channel is communicated with the outlet chamber;

[0012] An inner partition plate extends downward from the inner top wall of the inlet chamber to the upper part of the first flared end. The two sides of the inner partition plate are respectively the second water inlet channel and the inlet chamber. A check valve for allowing the water in the inlet chamber to enter the second water inlet channel unidirectionally is installed on the inner partition plate.

[0013] As can be seen from the above technical solutions, compared with the prior art, the present utility model discloses a pump head structure of a jet pump. When the jet pump self-priming, the valve is opened, enabling part of the water in the water outlet cavity to flow back to the horn-shaped return pipe through the return pipe, that is, allowing the high-pressure water to flow to the negative pressure area to complete the self-priming of the water pump. When the water inlet pipe is full of water, the valve is closed, blocking the high-pressure water from flowing to the negative pressure area through the return pipe, thus avoiding the idling and circulation of water in the pump casing. At this time, the jet pump (the power of the jet pump is 15%-20%, up to 30%) becomes a centrifugal pump (the efficiency of the centrifugal pump is 50%-70%, up to 85%), thereby greatly improving the water outlet efficiency of the jet pump, and the jet pump can maintain the operation mode of the centrifugal pump after sucking up water. In addition, the setting of the outer liquid supplement pipe enables the water in the water inlet cavity to enter the jet venturi tube not only through the first water inlet channel, but also through the second water inlet channel with a large flow rate, making up for the obstruction to water absorption generated by the narrow part of the jet venturi tube through the second water inlet channel, thereby improving the water absorption and water outlet efficiency of the pump. And because the pressure of the water and air entering the second water inlet channel is relatively small, it may cause the water and air in the second water inlet channel to flow back into the water inlet cavity in the reverse direction, resulting in the air not being quickly exhausted and reducing the suction lift of the pump. Therefore, the check valve enables the water and air in the water inlet cavity to enter the second water inlet channel, while the water and air in the second water inlet channel will not flow back into the water inlet cavity, enabling the air to be quickly exhausted during the self-priming process and greatly increasing the suction lift of the pump.

[0014] Further, the valve is an electric valve, which is electrically connected to the controller of the jet pump, and a liquid level sensor electrically connected to the controller of the jet pump is installed on the water inlet.

[0015] The beneficial effects of adopting the above technical solutions are as follows: When the liquid level sensor on the water inlet of the jet pump detects the flow of water, it indicates that the water inlet pipe is full of water, and at this time the controller controls the electric valve to close. Therefore, a liquid level sensor and an electric valve are provided on the pump head to realize the automatic switching of the jet pump to the centrifugal pump, without manual operation, and the water outlet efficiency of the pump can be improved after switching to the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0017] Figure 1 It is a schematic structural diagram of a pump head structure of a jet pump provided by the present utility model.

[0018] Figure 2Schematic diagram of the water flow after the assembly of the pump head structure and the impeller assembly of a jet pump provided by the present utility model. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] As Figure 1 shown, an embodiment of the present utility model discloses a pump head structure of a jet pump, including:

[0021] A pump casing 1, on the casing wall of the pump casing 1, there are provided a water inlet 101 connected to a water inlet pipe and a jet port 102 connected to a water outlet pipe. Inside the pump casing 1, there is a water inlet cavity 103 communicating with the water inlet 101 and a water outlet cavity 104 communicating with the jet port 102. On the inner wall of the pump casing 1, there is a water passing hole 105 for communicating the water inlet cavity 103 and the water outlet cavity 104. The jet venturi tube 2 is installed on the inner wall of the pump casing 1 by screw connection or snap connection or integral molding. The first flared end 201 of the jet venturi tube 2 communicates with the water passing hole 105, and the second flared end 202 of the jet venturi tube 2 communicates with the water outlet cavity 104. At the rear side position corresponding to the water passing hole 105 inside the pump casing 1, there is a flared return pipe 3 communicating with the water inlet cavity 103. The narrow end 301 of the flared return pipe 3 is arranged opposite to the first flared end 201;

[0022] At the rear end of the lower cavity wall of the water outlet cavity 104, there is a return pipe 4 connected. The return pipe 4 communicates with the third flared end 302 of the flared return pipe 3, and a valve 5 is installed on the return pipe 4;

[0023] An outer liquid supplement pipe 6, which is installed on the inner wall of the pump casing 1 by welding or screwing or integral molding. The first flared end 201 and the narrow end 301 are arranged at intervals, and a first water inlet channel 106 is formed therebetween. The second flared end 202 is inserted into the outer liquid supplement pipe 6, and a second water inlet channel 107 is formed in the gap therebetween. Both the first water inlet channel 106 and the second water inlet channel 107 communicate with the water inlet cavity 103, and the second water inlet channel 107 communicates with the water outlet cavity 104;

[0024] An inner partition 7, the inner partition 7 extends downward from the inner top wall of the water inlet cavity 103 to the upper part of the first flared end 201. On both sides of the inner partition 7 are the second water inlet channel 107 and the water inlet cavity 103 respectively. A check valve 8 for allowing the water in the water inlet cavity 103 to enter the second water inlet channel 107 unidirectionally is installed on the inner partition 7.

[0025] The valve 5 is preferably an electric valve, which is electrically connected to the controller of the jet pump. A liquid level sensor 9 electrically connected to the controller of the jet pump is installed on the water inlet 101.

[0026] Figure 2 It shows the installation structural position relationship between the pump housing structure and the impeller assembly 10 of the dotted line structure. Among them, the impeller assembly 10 is detachably connected to the open side of the pump housing 1. The second flared end 202 of the jet venturi tube and the second water inlet channel 107 can both communicate with the water inlet 1001 of the impeller assembly 10. The water outlet 1002 on the outer edge of the impeller assembly 10 communicates with the water outlet cavity 104.

[0027] The working principle of this pump housing structure is as follows: Fill the pump housing with water through the water injection port 11 on the pump housing. The impeller assembly 10 rotates, causing the water in the pump housing to be ejected through the narrow end, forming a high-speed water flow at the water inlet cavity. At this time, the pressure in the water inlet cavity decreases to form a negative pressure, and the water at a lower level outside will be sucked by the negative pressure through the water inlet and flow into the pump housing interior, and simultaneously flow into the water inlet of the impeller assembly through the first water inlet channel and the second water inlet channel, and enter the water outlet cavity through the guide flow of the impeller assembly and finally be ejected through the jet port. During this process, when the liquid level sensor senses that the water inlet pipe of the jet pump is full of water, the controller of the jet pump controls the valve to close automatically. At this time, the jet pump (the power of the jet pump is 15%-20%, up to 30%) becomes a centrifugal pump (the efficiency of the centrifugal pump is 50%-70%, up to 85%), thereby greatly improving the water outlet efficiency of the jet pump. And after the jet pump sucks up water, it can maintain the operation mode of the centrifugal pump all the time, greatly improving the water outlet efficiency of the pump. The setting of the check valve can only allow the water and air in the water inlet cavity to enter the second water inlet channel and cannot flow reversely into the water inlet cavity, enabling the air to be quickly exhausted during the self-priming process and greatly increasing the suction lift of the pump.

[0028] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the relevant parts, reference can be made to the description in the method part.

[0029] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pump head structure of a jet pump, characterized in that: include: A pump casing (1), wherein a water inlet (101) connected to a water inlet pipe and an injection port (102) connected to a water outlet pipe are provided on the casing wall of the pump casing (1); a water inlet chamber (103) connected to the water inlet (101) and a water outlet chamber (104) connected to the injection port (102) are provided inside the pump casing (1); a water through hole (105) for connecting the water inlet chamber (103) and the water outlet chamber (104) is provided on the inner wall of the pump casing (1); and the injection venturi tube (2) is detachably mounted on the casing wall. On the inner wall of the pump housing (1), the first flared end (201) of the jet venturi tube (2) is in communication with the water through hole (105), and the second flared end (202) of the jet venturi tube (2) is in communication with the water outlet chamber (104). A trumpet-shaped return pipe (3) in communication with the water inlet chamber (103) is provided at a rear position corresponding to the water through hole (105) inside the pump housing (1), and the narrow end (301) of the trumpet-shaped return pipe (3) is arranged opposite to the first flared end (201); A water return pipe (4) is connected to the rear end of the lower cavity wall of the water outlet cavity (104), the water return pipe (4) is in communication with the third expanded end (302) of the trumpet-shaped return pipe (3), and a valve (5) is installed on the water return pipe (4); An outer layer liquid infusion tube (6) is fixed on the inner wall of the pump housing (1), the first flared end (201) and the narrow end (301) are arranged at intervals, and a first water inlet channel (106) is formed between the two, the second flared end (202) is inserted into the outer layer liquid infusion tube (6), and the gap between the two forms a second water inlet channel (107), the first water inlet channel (106) and the second water inlet channel (107) are both connected to the water inlet chamber (103), and the second water inlet channel (107) is connected to the water outlet chamber (104); An inner baffle (7), the inner baffle (7) extending downward from the inner top wall of the water inlet chamber (103) to the upper part of the first flared end (201), the second water inlet channel (107) and the water inlet chamber (103) being located on both sides of the inner baffle (7), and a check valve (8) for allowing water in the water inlet chamber (103) to enter the second water inlet channel (107) in one direction being installed on the inner baffle (7).

2. A pump head structure of a jet pump according to claim 1, characterized in that: The valve (5) is an electric valve, which is electrically connected to the controller of the jet pump. A liquid level sensor (9) electrically connected to the controller of the jet pump is installed on the water inlet (101).

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