Pump head of injection pump

Abstract

The utility model discloses a pump head of an injection pump, which comprises a pump shell, a water inlet, a water outlet pipe and an injection orifice are arranged on the pump shell, a water inlet cavity communicated with the water inlet, a water outlet cavity communicated with the injection orifice and a backflow cavity communicated with the water outlet cavity are arranged in the pump shell, and a water through hole communicated with the water inlet cavity and the water outlet cavity is arranged on the inner wall of the pump shell. A first flaring end mounted on the jet venturi tube is communicated with the water through hole, a second flaring end is communicated with the water outlet cavity, a narrow end of a trumpet-shaped backflow tube in the pump shell is opposite to the first flaring end, and a sealing part of the circulation hole is arranged on the backflow cavity; a valve core of the manual stop valve is in sealing contact with the sealing part; the outer-layer liquid supplementing pipe is fixed to the inner wall of the pump shell, a first water inlet channel is formed between the first flaring end and the narrow opening end, the second flaring end is inserted into the outer-layer liquid supplementing pipe, and a second water inlet channel is formed between the second flaring end and the outer-layer liquid supplementing pipe. According to the pump shell, the backflow cavity and the pump shell are integrally designed, and the problems of untight sealing and water leakage caused by split design are solved.

Description

Technical Field

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

[0002] Jet self-priming pumps are widely used due to their strong self-priming ability, high self-priming height, low NPSH, high closing head and convenient use. The working principle of the jet self-priming pump is: before the water pump is started, the pump casing is filled with water. After starting, the motor drives the impeller to rotate at high speed to generate high pressure, so that the water in the impeller groove flows to the volute. At this time, negative pressure is formed in the water inlet pipe and the injection duct. The air and liquid in the water inlet pipeline are sucked into the impeller through the water inlet pipe and the trumpet-shaped nozzle, and then return to the water outlet of the pump body through the guide groove in the guide cover. In order to facilitate the smooth flow of the guide groove, a flow channel is made at the opening of the guide groove. The gas and liquid flow through the flow channel of the guide cover to the water outlet of the pump and are ejected out.

[0003] Prior art such as CN116641898A - a water pump with high self-priming and high efficiency, which discloses that a return pipe is connected to the rear end of the lower cavity wall of the water outlet cavity, the return pipe is connected to the trumpet-shaped jet nozzle, and a second valve is installed on the 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 trumpet-shaped jet nozzle through the return pipe, that is, to allow high-pressure water to 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 full of water, the second valve is closed to block the high-pressure water and the negative pressure area. Therefore, the water pump changes from a jet pump (the power of the jet pump is 15%-20%, the highest is 30%) to a centrifugal pump (the efficiency of the centrifugal pump is 50%-70%, the highest is 85%), the pumping efficiency of the water pump is greatly improved, and the water pump can always maintain the operation of the centrifugal pump after sucking water.

[0004] However, in this process, the return pipe is placed externally, resulting in a non-compact pump casing structure, and the return pipe needs to be connected to the pump casing by welding or screws, which often causes poor sealing and water leakage; in addition, because the water pump has no reminder function, the operator needs to always use his eyes to observe whether the water inlet pipe is full of water, which often leads to the second valve not being closed in time, causing the pump casing to complete self-priming, and part of the water in the water outlet chamber (inner chamber of the pump casing) in the pump casing still continuously flows back to the trumpet-shaped jet nozzle (return chamber), that is, high-pressure water continuously flows to the negative pressure area, causing the water to idle and circulate in the pump casing, consuming the electric energy of the motor in vain, and also affecting the water outlet efficiency of the pump. In addition, the water and air pressure entering the second water inlet channel is relatively low, which may cause the water and air in the second water inlet channel to reversely enter the water inlet chamber, causing the air to not be quickly pumped out, reducing the suction range of the pump.

[0005] Therefore, how to provide a jet pump head that integrates the return pipe and the pump casing to avoid the problem of poor sealing and leakage caused by the separate design, and can warn whether the water inlet pipe is full of water, so as to facilitate the operator to close the second valve in time, improve the water discharge efficiency of the pump, and increase the suction range of the pump is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0006] In view of this, the utility model provides a pump head of a jet pump that integrates a return pipe and a pump casing to avoid water leakage caused by a separate design, and can warn whether the water inlet pipe is full of water, making it convenient for the operator to close the second valve in time, thereby improving the water discharge efficiency of the pump and increasing the suction range of the pump.

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

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

[0009] A pump casing, wherein a water inlet connected to a water inlet pipe and an injection port connected to a water outlet pipe are provided on the casing wall of the pump casing, a water inlet chamber connected to the water inlet, a water outlet chamber connected to the injection port and a reflux chamber connected to the water outlet chamber are provided inside the pump casing, the reflux chamber is located below the water outlet chamber, a water through hole for connecting the water inlet chamber and the water outlet chamber is provided on the inner wall of the pump casing, a jet venturi tube is detachably mounted on the inner wall of the pump casing, a first flared end of the jet venturi tube is connected to the water through hole, a second flared end of the jet venturi tube is connected to the water outlet chamber, a trumpet-shaped reflux pipe connected to the water inlet chamber and the reflux chamber is provided at a rear side position corresponding to the water through hole inside the pump casing, the narrow end of the trumpet-shaped reflux pipe is arranged opposite to the first flared end, and a sealing portion of a flow hole is provided on the cavity wall of the reflux chamber;

[0010] A manual stop valve, the manual stop valve being mounted on the pump housing, the valve core of the manual stop valve being in sealing contact with the sealing portion, and being used to seal the flow hole of the sealing portion;

[0011] The outer layer fluid infusion tube 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 between the two, the second flared end is inserted into the outer layer fluid infusion tube, and the gap between the two forms a second water inlet channel, the first water inlet channel and the second water inlet channel are both connected to the water inlet cavity, and the second water inlet channel is connected to the water outlet cavity.

[0012] It can be seen from the above technical solution that, compared with the prior art, the utility model discloses a pump head of a jet pump, in which a reflux chamber is integrated inside the pump casing, and there is no need to separately connect a reflux pipe, thereby effectively avoiding the problem of water leakage caused by a split design of the pump casing and the reflux pipe; and, when the jet pump is self-priming, the manual stop valve is opened to connect the water outlet chamber and the reflux chamber, that is, part of the water in the water outlet chamber is allowed to flow back to the trumpet-shaped reflux pipe through the flow hole of the sealing part, that is, the high-pressure water is allowed to flow to the negative pressure area to complete the self-priming of the water pump. Afterwards, by operating the manual stop valve, the valve core is sealed in contact with the flow hole of the sealing part, blocking the water outlet chamber and the reflux chamber, thereby preventing water from idling and circulating between the water outlet chamber and the reflux chamber in the pump housing. At this time, the jet pump (the power of the jet pump is 15%-20%, and the maximum is 30%) becomes a centrifugal pump (the efficiency of the centrifugal pump is 50%-70%, and the maximum is 85%), thereby greatly improving the water outlet efficiency of the jet pump, and the jet pump can maintain the operation of the centrifugal pump mode after sucking water, greatly improving the water outlet efficiency of the pump; in addition, the provision of the outer layer liquid replenishment tube allows the water in the water inlet chamber to not only enter the jet venturi tube through the first water inlet channel, but also to enter the water at a large flow rate through the second water inlet channel, so that the obstruction to water absorption caused by the narrow part of the jet venturi tube is compensated by the second water inlet channel, thereby improving the water absorption and water outlet efficiency of the pump.

[0013] Further, the sealing portion and the manual stop valve are both located below the trumpet-shaped return pipe, or the sealing portion is located on the third flared end side of the trumpet-shaped return pipe, and the manual stop valve is correspondingly arranged on the rear side of the third flared end.

[0014] Furthermore, it also includes an inner partition, which extends downward from the inner top wall of the water inlet chamber to the upper part of the first expanded end, and the second water inlet channel and the water inlet chamber are respectively located on both sides of the inner partition. A first check valve for unidirectional entry of water from the water inlet chamber into the second water inlet channel is installed on the inner partition.

[0015] The beneficial effect of adopting the above technical solution is that because the water and air pressure entering the second water inlet channel is relatively low, the water and air in the second water inlet channel may reversely enter the water inlet chamber, causing the air to not be quickly pumped out, thereby reducing the suction range of the pump. Therefore, the first check valve allows the water and air in the water inlet chamber to enter the second water inlet channel, while the water and air in the second water inlet channel will not flow back to the water inlet chamber, so that the air is quickly pumped out during the self-priming process and the suction range of the pump is greatly improved.

[0016] Furthermore, a water level sensor and an alarm which are both electrically connected to the controller of the jet pump are installed on the water inlet pipe.

[0017] The beneficial effect of adopting the above technical solution is: when the water level sensor detects that the water inlet pipe of the jet pump is full of water, the alarm will sound and light alarm, and the operator can close the manual stop valve in time according to the alarm. At this time, the valve core of the manual stop valve is in sealing contact with the flow hole of the sealing part, blocking the water outlet chamber and the reflux chamber, thereby preventing water from idling and circulating between the water outlet chamber and the reflux chamber in the pump housing. At this time, the jet pump (the power of the jet pump is 15%-20%, the highest is 30%) becomes a centrifugal pump (the efficiency of the centrifugal pump is 50%-70%, the highest is 85%), thereby greatly improving the water outlet efficiency of the jet pump, and the jet pump can maintain the centrifugal pump mode after sucking water, greatly improving the water outlet efficiency of the pump. Therefore, by setting a water level sensor to monitor whether the water inlet pipe is full of water and alarming through the alarm, the operator does not need to observe the water inlet state of the water inlet pipe with his eyes all the time, reducing the degree of human eye fatigue, and avoiding the problem of water reciprocating in the pump housing and reducing the water outlet efficiency due to the untimely closing of the manual stop valve.

[0018] Furthermore, a second check valve is installed on the water inlet pipe.

[0019] The beneficial effect of adopting the above technical solution is: the setting of the second check valve allows water to enter the water inlet chamber only from the water inlet pipe, and the water in the water inlet chamber cannot flow out through the water inlet pipe. This can avoid the time-consuming and laborious problem of having to fill the water pump with water again when using the water pump next time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of a first embodiment of a pump head of a jet pump provided by the utility model.

[0022] Figure 2 This is a schematic structural diagram of a second embodiment of a pump head of a jet pump provided by the utility model.

[0023] Figure 3 A schematic diagram of the flow direction of water after the second embodiment of the pump head of a jet pump provided by the utility model is assembled with an impeller assembly. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figure 1 As shown, the first embodiment of the utility model discloses a pump head of a jet pump, characterized in that it comprises:

[0026] The pump housing 1 has a water inlet 101 connected to the water inlet pipe 10 and a jet port 102 connected to the water outlet pipe on its shell wall. Specifically, the water inlet 101 is arranged at the rear end side of the pump housing 1, and the jet port 102 is arranged on the outer peripheral side wall of the pump housing 1. The pump housing 1 has a water inlet chamber 103 connected to the water inlet 101, a water outlet chamber 104 connected to the jet port 102, and a reflux chamber 105 connected to the water outlet chamber 104. The reflux chamber 105 is located below the water outlet chamber 104. The inner wall of the pump housing 1 has a water inlet chamber 103 and a water outlet chamber 104 for connecting the water inlet chamber 103 and the water outlet chamber 104. The water through hole 106, the jet venturi tube 2 is detachably mounted on the inner wall of the pump housing 1 (can be connected by screws or clamping), the first flared end 201 of the jet venturi tube 2 is connected to the water through hole 106, the second flared end 202 of the jet venturi tube 2 is connected to the water outlet chamber 104, and a trumpet-shaped reflux pipe 3 connected to the water inlet chamber 103 and the reflux chamber 105 is provided at the rear side position corresponding to the water through hole 106 inside the pump housing 1, the narrow end 301 of the trumpet-shaped reflux pipe 3 is arranged opposite to the first flared end 201, and a sealing portion 107 of a flow hole is provided on the cavity wall of the reflux chamber 105;

[0027] A manual stop valve 4, the manual stop valve 4 is mounted on the pump housing 1, and a valve core of the manual stop valve 4 is in sealing contact with the sealing portion 107, so as to seal the flow hole of the sealing portion 107;

[0028] The outer layer fluid infusion tube 5 is welded, screwed or integrally formed 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 108 is formed between the two. The second flared end 202 is inserted into the outer layer fluid infusion tube 5, and the gap between the two forms a second water inlet channel 109. The first water inlet channel 108 and the second water inlet channel 109 are both connected to the water inlet chamber 103, and the second water inlet channel 109 is connected to the water outlet chamber 104.

[0029] In this embodiment, the manual stop valve is opened when the jet pump is self-priming, so that the water outlet chamber and the reflux chamber are connected, that is, part of the water in the water outlet chamber is allowed to flow back to the trumpet-shaped reflux pipe through the flow hole of the sealing part, that is, the high-pressure water is allowed to flow to the negative pressure area to complete the self-priming of the water pump. Afterwards, by operating the manual stop valve, the valve core is sealed in contact with the flow hole of the sealing part, blocking the water outlet chamber and the reflux chamber, thereby preventing water from idling and circulating between the water outlet chamber and the reflux chamber in the pump casing. At this time, the jet pump (the power of the jet pump is 15%-20%, and the maximum is 30%) becomes a centrifugal pump (the efficiency of the centrifugal pump is 50%-70%, and the maximum is 85%), thereby greatly improving the water outlet efficiency of the jet pump, and the jet pump can maintain the operation of the centrifugal pump mode after sucking water, greatly improving the water outlet efficiency of the pump; in addition, the provision of the outer layer liquid replenishment tube allows the water in the water inlet chamber to not only enter the jet venturi tube through the first water inlet channel, but also to enter the water at a large flow rate through the second water inlet channel, so that the obstruction to water absorption caused by the narrow part of the jet venturi tube is compensated by the second water inlet channel, thereby improving the water absorption and water outlet efficiency of the pump.

[0030] It should be noted that the sealing portion 107 can be an annular sealing boss with a flow hole integrally formed with the cavity wall of the reflux cavity, or a brass sealing ring installed on the reflux cavity, the center hole of the brass sealing ring being the flow hole.

[0031] The sealing portion 107 and the manual stop valve 4 are both located below the trumpet-shaped return pipe 3 (see Figure 1 The manual stop valve of the solid line structure in FIG), or the sealing portion 107 is located on the third flared end 302 side of the trumpet-shaped return pipe 3, and the manual stop valve 4 is correspondingly arranged on the rear side of the third flared end 302 (see FIG. Figure 1 Manual stop valve with dotted line structure in the figure).

[0032] The second embodiment of the utility model further comprises an inner baffle 6, which extends downward from the inner top wall of the water inlet chamber 103 to the upper part of the first expanded end 201, and the second water inlet channel 109 and the water inlet chamber 103 are respectively formed on both sides of the inner baffle 6, and a first check valve 7 for the water of the water inlet chamber 103 to enter the second water inlet channel 109 in one direction is installed on the inner baffle 6. In this embodiment, the first check valve 7 allows the water and air in the water inlet chamber to enter the second water inlet channel, while the water and air in the second water inlet channel will not flow back to the water inlet chamber, so that the air is quickly pumped out during the self-priming process and the suction range of the pump is greatly improved.

[0033] In the above two embodiments, a water level sensor 8 and an alarm 9, both electrically connected to the controller of the jet pump, are installed on the water inlet pipe 10. In this way, when the water level sensor detects that the water inlet pipe of the jet pump is full of water, the alarm sounds and sounds an alarm, and the operator can close the manual stop valve in time according to the alarm. At this time, the valve core of the manual stop valve is in sealing contact with the flow hole of the sealing part, blocking the water outlet chamber and the reflux chamber, thereby preventing water from idling and circulating between the water outlet chamber and the reflux chamber in the pump housing.

[0034] A second check valve 11 is installed on the water inlet pipe 10, so that after the jet pump is stopped, the water in the pump housing will not flow out in the opposite direction, ensuring that there is always water in the pump housing. When used next time, there is no need to fill the pump body with water again, which causes time-consuming and laborious problems.

[0035] Figure 3 The schematic diagram shows the installation structural position relationship between the pump casing structure and the impeller assembly 11 of the dotted line structure, wherein the impeller assembly 11 is detachably connected to the open side of the pump casing 1, the second expanded end 202 of the jet venturi tube and the second water inlet channel 109 can be connected to the water inlet 1101 of the impeller assembly 11, and the water outlet 1102 at the outer edge of the impeller assembly 11 is connected to the water outlet chamber 104.

[0036] The working principle of the pump casing is as follows: water is filled into the pump casing through the water filling port 12 on the pump casing, and the impeller assembly 11 rotates, so that the water in the pump casing is ejected through the narrow end of the return pipe 3, forming a high-speed water flow at the water inlet chamber. At this time, the pressure in the water inlet chamber is reduced to form a negative pressure, and the water at the low point outside will be pumped by the negative pressure through the water inlet to the inside of the pump casing, and flow through the first water inlet channel and the second water inlet channel at the same time to the water inlet of the impeller assembly, and enter the water outlet chamber through the water outlet through the guide of the impeller assembly, and finally be ejected through the injection port. During this process, when the water level sensor detects that the water inlet pipe of the jet pump is full of water, the alarm will sound and light, and the operator can close the manual stop valve in time according to the alarm. At this time, the valve core of the manual stop valve is in sealing contact with the flow hole of the sealing part, blocking the water outlet chamber and the reflux chamber, thereby preventing water from idling and circulating between the water outlet chamber and the reflux chamber 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 of the centrifugal pump after sucking up water, which greatly improves the water outlet efficiency of the pump.

[0037] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred 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 the relevant parts can be referred to the method part.

[0038] 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 apparent to those skilled in the art, and the general principles defined herein may 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 the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pump head of a jet pump, characterized in that: include: A pump casing (1), wherein a water inlet (101) connected to a water inlet pipe (10) and an injection port (102) connected to a water outlet pipe are provided on the casing wall of the pump casing (1); the pump casing (1) has a water inlet chamber (103) connected to the water inlet (101), a water outlet chamber (104) connected to the injection port (102), and a reflux chamber (105) connected to the water outlet chamber (104); the reflux chamber (105) is located below the water outlet chamber (104); a water through hole (106) 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 an injection venturi tube (2) is provided. The pump housing (1) is detachably mounted 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 (106); 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) and the return chamber (105) is provided at a rear position corresponding to the water through hole (106) inside the pump housing (1); the narrow end (301) of the trumpet-shaped return pipe (3) is arranged opposite to the first flared end (201); and a sealing portion (107) of a flow hole is provided on the wall of the return chamber (105); a manual stop valve (4), the manual stop valve (4) being mounted on the pump housing (1), the valve core of the manual stop valve (4) being in sealing contact with the sealing portion (107) for sealing the flow hole of the sealing portion (107); The outer layer infusion tube (5) is fixed on the inner wall of the pump housing (1), the first flared end (201) and the narrow end (301) are arranged at an interval, and a first water inlet channel (108) is formed between the two, the second flared end (202) is inserted into the outer layer infusion tube (5), and the gap between the two forms a second water inlet channel (109), the first water inlet channel (108) and the second water inlet channel (109) are both connected to the water inlet chamber (103), and the second water inlet channel (109) is connected to the water outlet chamber (104).

2. A pump head for a jet pump according to claim 1, characterized in that: The sealing portion (107) and the manual stop valve (4) are both located below the trumpet-shaped return pipe (3), or the sealing portion (107) is located on the third flared end (302) side of the trumpet-shaped return pipe (3), and the manual stop valve (4) is correspondingly arranged on the rear side of the third flared end (302).

3. A pump head for a jet pump according to claim 1, characterized in that: The invention also comprises an inner baffle (6), wherein the inner baffle (6) extends downward from the inner top wall of the water inlet chamber (103) to the upper part of the first flared end (201), and the second water inlet channel (109) and the water inlet chamber (103) are located on both sides of the inner baffle (6), respectively. A first check valve (7) is installed on the inner baffle (6) for water in the water inlet chamber (103) to enter the second water inlet channel (109) in one direction.

4. A pump head for a jet pump according to any one of claims 1 to 3, characterized in that: The water inlet pipe (10) is provided with a water level sensor (8) and an alarm (9) both of which are electrically connected to the controller of the jet pump.

5. A pump head for a jet pump according to claim 4, characterized in that: A second check valve (11) is installed on the water inlet pipe (10).

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