Metering pump with pressure relief valve

Abstract

The utility model relates to the technical field of metering pumps, in particular to a metering pump with a pressure relief valve. In order to solve the problems that when the pressure in a pipeline connected with the output end of the metering pump is too high, a series of negative effects can be caused, normal operation of a system can be influenced, and damage to equipment, unstable flow or potential safety hazards can be caused, the following technical scheme is provided: the metering pump comprises a metering pump body, the metering pump body is connected with a liquid inlet pipe and a liquid outlet pipe; the two groups of one-way valves are respectively arranged between the liquid inlet pipe and the metering pump body and between the liquid discharge pipe and the metering pump body, and the one-way valves are used for ensuring that a liquid medium enters the metering pump body through the liquid inlet pipe and is discharged through the liquid discharge pipe; the pressure relief pipe is connected to the liquid discharge pipe; and a flow meter is mounted on the pressure relief pipe. According to the metering pump, the negative influence on the metering pump body and the system caused by overlarge pressure in the liquid discharge pipe can be effectively reduced, and the stability and the safety of the whole system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of metering pump especially relates to a metering pump with pressure relief valve. BACKGROUND

[0002] Metering pump is a kind of pump specially used for accurate control fluid flow, it can accurately deliver quantitative liquid to system, it is often used in chemical dosing, medicine injection, solution preparation and other applications needing accurate flow control.The core characteristics of metering pump are adjustable flow, precision, and usually can provide constant delivery, even if system pressure or fluid viscosity changes.When the pressure in the pipeline connected to the output end of metering pump is too large, it will cause a series of negative effects, which will affect the normal operation of the system, and may also cause damage to the equipment, unstable flow or safety hazards and other problems.In view of this, the utility model provides a metering pump with pressure relief valve. SUMMARY

[0003] The utility model aims at the problem that when the pressure in the pipeline connected to the output end of metering pump is too large in the background art, it will cause a series of negative effects, which will affect the normal operation of the system, and may also cause damage to the equipment, unstable flow or safety hazards, and proposes a metering pump with pressure relief valve.

[0004] The utility model discloses a kind of metering pumps with pressure relief valve, including metering pump body, the liquid inlet pipe and liquid outlet pipe are connected on the metering pump body;Two groups of check valves, two groups The check valve is installed between liquid inlet pipe and metering pump body and liquid outlet pipe and metering pump body respectively, and the check valve is used to ensure that liquid medium enters metering pump body through liquid inlet pipe and is discharged through liquid outlet pipe;Pressure relief pipe connected to the liquid outlet pipe, flowmeter is installed on the pressure relief pipe, and the flowmeter is provided with pressure relief valve installed on the pressure relief pipe between the liquid outlet pipe;Buffer mechanism is installed on the end of pressure relief pipe far from liquid outlet pipe, and the buffer mechanism is used to prevent liquid medium in pressure relief pipe directly enters into liquid inlet pipe;Liquid return pipe connected to the liquid inlet pipe, one end of the liquid return pipe is inserted into buffer mechanism.

[0005] Optionally, the check valve includes a hollow fixed shell, both ends of the fixed shell are provided with through holes, a plurality of fixed rods are fixedly connected to the inner wall of the fixed shell, one end of the plurality of fixed rods is commonly fixedly connected with a sleeve ring, a valve rod is slidably connected in the sleeve ring, a valve flap is fixedly connected to one end of the valve rod close to the liquid inlet pipe, and the diameter of the valve flap is greater than the diameter of the through hole.

[0006] Optionally, the buffer mechanism comprises a recovery tank fixedly connected to the side surface of the metering pump body, a plurality of inner sides of the recovery tank are fixedly connected with two groups of fixing blocks, the two groups of fixing blocks are fixedly connected with a limiting rod, the limiting rod is slidably connected with a limiting sleeve, the limiting sleeve is installed with a connecting plate, a plurality of groups of connecting plates are fixedly connected with a mounting plate, the top of the mounting plate is installed with a sealing plug, and the position of the sealing plug corresponds to the position of one end of the liquid return pipe.

[0007] Optionally, the buffer mechanism further comprises a push rod motor installed on the inner wall of the recovery tank, and the output end of the push rod motor is fixedly connected with a synchronization plate.

[0008] Optionally, the outer side of the push rod motor is provided with a waterproof cover, the waterproof cover is installed on the inner wall of the recovery tank, the output end of the push rod motor penetrates the waterproof cover, and the output end of the push rod motor is sleeved with a sealing ring, and the sealing ring is installed at the position penetrated by the output end of the push rod motor.

[0009] Optionally, the valve flap, the sealing plug and the sealing ring are all made of rubber material.

[0010] Optionally, a liquid level meter is installed in the recovery tank.

[0011] Optionally, the end of the liquid return pipe inserted into the recovery tank is always below the liquid level in the recovery tank.

[0012] In summary, the present application includes at least one of the following beneficial technical effects:

[0013] The utility model discloses a pressure relief valve is set, when the liquid medium is transported in the metering pump body, when the pressure in the liquid discharge pipe is too large, the pressure relief valve opens, and part of the liquid medium enters the recovery tank for temporary storage, and the liquid medium passing through is measured through the flowmeter, so that the metering accuracy of the metering pump body is guaranteed.

[0014] Further, through the setting of the buffer mechanism, the liquid medium passing through the pressure relief valve first enters the recovery tank, and then is sucked into the metering pump body through the liquid return pipe and the liquid inlet pipe, so that the problem that the liquid medium passing through the pressure relief valve directly impacts the liquid inlet pipe, causing the valve flap to be not tightly sealed and affecting the metering result is effectively solved through the buffer mechanism.

[0015] In summary, the utility model can effectively reduce the negative influence of the excessive pressure in the liquid discharge pipe on the metering pump body and the system, and improve the stability and safety of the whole system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure diagram of the metering pump with a pressure relief valve is given.

[0017] Figure 2 is a sectional view of the schematic diagram of Figure 1 ;

[0018] Figure 3 is an enlarged schematic diagram of A in Figure 2 ;

[0019] Figure 4 is an enlarged schematic diagram of B in Figure 2 .

[0020] Reference signs:

[0021] 1, metering pump body; 11, liquid inlet pipe; 12, liquid outlet pipe;

[0022] 2, check valve; 21, fixed shell; 22, fixed rod; 23, collar; 24, valve rod; 25, valve flap;

[0023] 3, pressure relief pipe; 4, flow meter; 5, pressure relief valve;

[0024] 6, buffer mechanism; 61, recovery box; 62, fixed block; 63, limiting rod; 64, limiting sleeve; 65, connecting plate; 66, mounting plate; 67, sealing plug; 68, push rod motor; 69, synchronization plate; 610, waterproof cover; 611, sealing ring;

[0025] 7, liquid return pipe; 8, liquid level meter. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0027] The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0028] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0029] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "connection", "connection" should be broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through the intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] Embodiment

[0032] As Figures 1 to 4 shown, the utility model proposes a kind of metering pump with pressure relief valve, including metering pump body 1, metering pump body 1 is connected with liquid inlet pipe 11 and liquid outlet pipe 12.

[0033] Specifically, the above-mentioned metering pump includes two groups of check valves 2, two groups of check valves 2 are installed between liquid inlet pipe 11 and liquid outlet pipe 12 and metering pump body 1 respectively, check valve 2 is used to ensure that liquid medium passes through liquid inlet pipe 11 into metering pump body 1 and is discharged through liquid outlet pipe 12. Check valve 2 includes the fixed shell 21 of hollow setting, both ends of fixed shell 21 are provided with through hole, to facilitate liquid medium to pass through fixed shell 21. Six groups of fixed rods 22 are fixedly connected on the inner wall of fixed shell 21, one end of six groups of fixed rods 22 is fixedly connected with the collar 23, and the position of fixed rod 22 and collar 23 is fixed. Collar 23 is slidably connected with valve rod 24, so that collar 23 moves along the length direction of itself. Valve rod 24 is fixedly connected with valve clack 25 at one end close to liquid inlet pipe 11, and the diameter of valve clack 25 is greater than the diameter of through hole, so as to facilitate valve clack 25 to press on the position of through hole to prevent liquid medium from passing through, to achieve the purpose of one-way through.

[0034] Further, the metering pump comprises a pressure relief pipe 3 connected to the liquid discharge pipe 12, which facilitates the discharge of the liquid medium in the liquid discharge pipe 12. A flow meter 4 is installed on the pressure relief pipe 3, which is used to measure the amount of liquid medium passing through the pressure relief pipe 3. A pressure relief valve 5 is installed on the pressure relief pipe 3 between the flow meter 4 and the liquid discharge pipe 12. When the pressure in the liquid discharge pipe 12 is too high, the pressure relief valve 5 opens to allow part of the liquid medium in the liquid discharge pipe 12 to enter the pressure relief pipe 3.

[0035] Further, the metering pump further comprises a buffer mechanism 6 installed on the pressure relief pipe 3 away from the liquid discharge pipe 12. The buffer mechanism 6 is used to prevent the liquid medium in the pressure relief pipe 3 from directly entering the liquid inlet pipe 11, thereby preventing the liquid in the pressure relief pipe 3 from directly impacting the liquid inlet pipe 11 to cause the sealing of the valve disc 25 to be not tight. The buffer mechanism 6 comprises a recovery tank 61 fixedly connected to the side of the metering pump body 1, and the position of the recovery tank 61 is fixed. Three inner sides of the recovery tank 61 are fixedly connected with two groups of fixed blocks 62, and the two groups of fixed blocks 62 are fixedly connected with a limiting rod 63. The position of the fixed blocks 62 and the limiting rod 63 is fixed. The limiting rod 63 is slidingly connected with a limiting sleeve 64, and the limiting sleeve 64 is installed with a connecting plate 65 which moves synchronously with the limiting sleeve 64. A plurality of connecting plates 65 are fixedly connected with a mounting plate 66 which moves stably under the limiting action of the limiting rod 63 and the limiting sleeve 64. The mounting plate 66 is installed with a sealing plug 67 at the top, and the position of the sealing plug 67 corresponds to the position of one end of the liquid return pipe 7. The sealing plug 67 is used to seal the liquid return pipe 7 after approaching the liquid return pipe 7, preventing the liquid medium from entering the liquid return pipe 7, thereby preventing the liquid return pipe 7 from absorbing too much liquid medium, causing the liquid level to be below the liquid return pipe 7, and causing bubbles in the liquid return pipe 7 to affect the metering result. The buffer mechanism 6 further comprises a push rod motor 68 installed on the inner wall of the recovery tank 61, and the output end of the push rod motor 68 is fixedly connected with a synchronous plate 69 which is fixedly connected with the mounting plate 66. The push rod motor 68 drives the mounting plate 66 to move through the synchronous plate 69 after being started. The outer side of the push rod motor 68 is provided with a waterproof cover 610 which is installed on the inner wall of the recovery tank 61 and is used to prevent the waterproof cover 610 from being eroded by the liquid medium. The output end of the push rod motor 68 penetrates the waterproof cover 610, and the output end of the push rod motor 68 is sleeved with a sealing ring 611 which is installed at the position of the waterproof cover 610 penetrated by the output end of the push rod motor 68, preventing the liquid medium from entering the waterproof cover 610. The valve disc 25, the sealing plug 67 and the sealing ring 611 are all made of rubber material and have good sealing performance.

[0036] Finally, the metering pump comprises a liquid return pipe 7 connected to the liquid inlet pipe 11, one end of the liquid return pipe 7 is inserted into the buffer mechanism 6, and the end of the liquid return pipe 7 inserted into the recovery tank 61 is always below the liquid level in the recovery tank 61, preventing gas from entering the liquid return pipe 7.

[0037] The liquid level gauge 8 is installed in the recovery tank 61 to monitor the liquid level in the recovery tank 61, so that the push rod motor 68 is started to seal the liquid return pipe 7 when the liquid level is low.

[0038] In the embodiment, when the metering pump body 1 is started to bring liquid in, the valve disc 25 of the one-way valve 2 connected with the liquid inlet pipe 11 is close to the collar 23, and the liquid enters the metering pump body 1 through the liquid inlet pipe 11, while the valve disc 25 of the one-way valve 2 connected with the liquid outlet pipe 12 is away from the collar 23, and the liquid in the liquid outlet pipe 12 cannot enter the metering pump body 1. When the liquid is discharged, the valve disc 25 of the one-way valve 2 connected with the liquid inlet pipe 11 is away from the collar 23, and the liquid in the metering pump body 1 cannot enter the liquid inlet pipe 11, while the valve disc 25 of the one-way valve 2 connected with the liquid outlet pipe 12 is close to the collar 23, and the liquid in the metering pump body 1 is discharged through the liquid outlet pipe 12. At the same time, when the pressure in the liquid outlet pipe 12 is too large and reaches the set value of the pressure relief valve 5, the pressure relief valve 5 is opened, part of the liquid in the liquid outlet pipe 12 enters the recovery tank 61 through the pressure relief pipe 3, and the liquid passing through the pressure relief pipe 3 is metered by the flow meter 4, which cooperates with the metering pump body 1 to make the metering result accurate. When the liquid in the recovery tank 61 is at a high liquid level, the push rod motor 68 is started to drive the mounting plate 66 to move downward through the synchronization plate 69, so that the mounting plate 66 moves downward under the limiting action of the limiting rod 63 and the limiting sleeve 64, so that the sealing plug 67 is away from the liquid return pipe 7, so that when the metering pump body 1 extracts liquid from the liquid inlet pipe 11, part of the liquid in the recovery tank 61 is also extracted through the liquid return pipe 7. When the liquid in the recovery tank 61 is at a low liquid level, the push rod motor 68 is started to drive the sealing plug 67 to move upward and seal one end of the liquid return pipe 7, to prevent the liquid in the recovery tank 61 from entering the liquid return pipe 7.

[0039] The above specific embodiments are only optional embodiments of the present application, and based on the technical solutions of the present application and the related inspiration of the above embodiments, those skilled in the art can make various alternative improvements and combinations on the above specific embodiments.

Claims

1. A metering pump with a pressure relief valve, characterized in that The utility model provides a kind of metering pump, including: Metering pump body (1), the liquid inlet pipe (11) and the liquid outlet pipe (12) are connected on the metering pump body (1); Two groups of check valves (2), two groups of check valves (2) are installed between liquid inlet pipe (11) and liquid outlet pipe (12) and metering pump body (1) respectively, check valve (2) is used to ensure that liquid medium enters metering pump body (1) through liquid inlet pipe (11) and is discharged through liquid outlet pipe (12); Pressure relief pipe (3) connected to the liquid outlet pipe (12), flowmeter (4) is installed on the pressure relief pipe (3), pressure relief valve (5) is arranged between flowmeter (4) and liquid outlet pipe (12) and is installed on pressure relief pipe (3); Buffer mechanism (6) is installed on the end of pressure relief pipe (3) away from liquid outlet pipe (12), buffer mechanism (6) is used to prevent liquid medium in pressure relief pipe (3) from directly entering liquid inlet pipe (11); Liquid return pipe (7) connected to the liquid inlet pipe (11), one end of the liquid return pipe (7) is inserted into buffer mechanism (6).

2. A metering pump with relief valve according to claim 1, characterized in that The check valve (2) includes a hollow fixed shell (21), both ends of the fixed shell (21) are provided with through holes, a plurality of fixed rods (22) are fixedly connected to the inner wall of the fixed shell (21), one end of the plurality of fixed rods (22) is fixedly connected to a sleeve ring (23), a valve rod (24) is slidably connected to the sleeve ring (23), a valve disc (25) is fixedly connected to one end of the valve rod (24) close to the liquid inlet pipe (11), and the diameter of the valve disc (25) is greater than the diameter of the through hole.

3. A metering pump with relief valve according to claim 2, characterized in that The buffer mechanism (6) includes a recovery tank (61) fixedly connected to the side of the metering pump body (1), a plurality of inner sides of the recovery tank (61) are fixedly connected to two groups of fixed blocks (62), the two groups of fixed blocks (62) are fixedly connected to a limiting rod (63), the limiting rod (63) is slidably connected to a limiting sleeve (64), the limiting sleeve (64) is installed on a connecting plate (65), a plurality of connecting plates (65) are fixedly connected to an installation plate (66), a sealing plug (67) is installed on the top of the installation plate (66), and the position of the sealing plug (67) corresponds to the position of one end of the liquid return pipe (7).

4. A metering pump with relief valve according to claim 3, characterized in that The buffer mechanism (6) further includes a push rod motor (68) installed on the inner wall of the recovery tank (61), the output end of the push rod motor (68) is fixedly connected to a synchronization plate (69), and the synchronization plate (69) is fixedly connected to the installation plate (66).

5. A metering pump with relief valve according to claim 4, characterized in that A waterproof cover (610) is arranged on the outer side of the push rod motor (68), the waterproof cover (610) is installed on the inner wall of the recovery tank (61), the output end of the push rod motor (68) penetrates the waterproof cover (610), and a sealing ring (611) is sleeved on the output end of the push rod motor (68), and the sealing ring (611) is installed on the position of the waterproof cover (610) penetrated by the output end of the push rod motor (68).

6. A metering pump with relief valve according to claim 5, characterized in that The valve disc (25), the sealing plug (67), and the sealing ring (611) are all made of rubber.

7. A metering pump with relief valve according to claim 6, characterized in that A liquid level meter (8) is installed in the recovery tank (61).

8. A metering pump with relief valve according to claim 7, characterized in that The one end of the liquid return pipe (7) inserted into the recovery tank (61) is always below the liquid level in the recovery tank (61). The one end of the liquid return pipe (7) inserted into the recovery tank (61) is always below the liquid level in the recovery tank (61).

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