Metering pump

Abstract

The utility model discloses a metering pump which comprises a shell, a metering pump and a movement mechanism, the metering pump and the movement mechanism are arranged in the shell, and one side of the shell is further connected with a connector. The quantitative bag is arranged in the second cavity, the driving mechanism is arranged in the first cavity, and gas is injected into or discharged out of the first cavity through the gas pipe to drive the movement mechanism to move repeatedly, so that the quantitative bag is extruded, the quantitative bag is in a contracted state to an extended state, and liquid is sucked into the quantitative bag from the liquid inlet pipeline; the liquid is extruded out of the quantitative bag from the stretching state to the contracting state and is discharged through the liquid outlet pipeline, and the technical problem that gas in the gas bin of the metering pump flows into the liquid bin to affect the liquid is solved. According to the utility model, a first in-place sensor and a second in-place sensor are arranged at a first preset position and a second preset position in the first chamber, so that the first in-place sensor and the second in-place sensor can judge whether the driving mechanism reaches a specified preset position or not.

Description

Technical Field

[0001] The utility model relates to the field of metering pumps, in particular to a metering pump. Background Art

[0002] A metering pump is a hydraulic pump in which the volume of oil discharged by the pump (i.e. displacement) remains fixed when the pump shaft rotates one circle. It has a simpler structure than a variable displacement pump and is widely used. It is usually used to pump out special liquids.

[0003] In addition, existing metering pumps usually adopt a design in which the gas chamber and the quantitative chamber are separated. The liquid in the quantitative chamber is pushed out by a push rod pushing a sealing disk in the quantitative chamber. The push rod connects the liquid chamber and the gas chamber. Since the push rod needs to slide in the liquid chamber and the gas chamber, there is a gap between the two chambers. The gas in the gas chamber of the traditional metering pump will flow into the liquid chamber, affecting the normal use of the liquid chamber. Utility Model Content

[0004] The utility model provides a metering pump to solve the technical problem in the prior art that the gas in the gas bin of the metering pump flows into the liquid bin and affects the normal use of the liquid bin.

[0005] The technical solution adopted by the utility model is:

[0006] The utility model provides a metering pump, comprising:

[0007] A shell, wherein the shell is divided into a first chamber and a second chamber in sequence, and the shell is provided with a front air pipe and a rear air pipe communicating with the first chamber;

[0008] A quantitative capsule installed in the second chamber;

[0009] A connector, the connector is connected to the housing, the connector is provided with a liquid inlet pipe and a liquid outlet pipe connected to the quantitative capsule, the liquid inlet pipe is provided with an inlet one-way valve, and the liquid outlet pipe is provided with a liquid outlet one-way valve;

[0010] A motion mechanism, wherein the motion mechanism is installed in the first chamber, a push rod of the motion mechanism closes the first chamber and the second chamber, and one end of the push rod extends into the second chamber to connect with the quantitative capsule;

[0011] When the rear air pipe is opened, gas is injected into the first chamber to push the moving mechanism to move from the second preset position to the first preset position, and the push rod drives the quantitative bag to extend. After the liquid enters the quantitative bag from the liquid inlet pipe, the gas in the first chamber is discharged from the rear air pipe. The front air pipe is opened, and gas is injected into the first chamber through the front air pipe to push the moving mechanism to move from the first preset position to the second preset position, so that the push rod compresses the quantitative bag, and the liquid in the quantitative bag is discharged through the liquid outlet pipe.

[0012] Furthermore, the motion mechanism comprises:

[0013] a blocking valve, the blocking valve having an interference fit with the first chamber;

[0014] A push rod, one end of which is connected to the blocking valve, and the other end of which extends into the second chamber to compress the quantitative capsule.

[0015] Furthermore, the metering pump also includes a pull plate assembly, one side of the pull plate assembly is connected to the push rod, and the other side of the pull plate assembly is fixed to the quantitative capsule.

[0016] Furthermore, the metering pump also includes a pull plate assembly, one side of the pull plate assembly is connected to the push rod, and the other side of the pull plate assembly is fixed to the quantitative capsule.

[0017] Furthermore, the second chamber is provided with an exhaust port communicating with the outside.

[0018] Furthermore, the first preset position is provided with a first in-position sensor, and the second preset position is provided with a second in-position sensor.

[0019] Furthermore, a limiting block is provided in the first chamber at a position opposite to the motion mechanism to limit the moving range of the motion mechanism, and the first in-position sensor is mounted on the limiting block.

[0020] Furthermore, the shell includes a first shell provided with a first chamber and a second shell provided with a second chamber, and the first shell and the second shell are spliced ​​to form the shell.

[0021] Furthermore, the metering pump also includes a base plate assembly for supporting the bottom of the housing.

[0022] Furthermore, a sealing ring is provided between the limiting block and the inner wall of the first chamber.

[0023] Furthermore, electromagnetic switches are provided at the front air intake pipe and the rear air intake pipe.

[0024] Compared with the prior art, the utility model sets a quantitative capsule in the second chamber, sets a driving mechanism in the first chamber, injects or discharges gas into the first chamber through the air pipe to drive the motion mechanism to move repeatedly, thereby squeezing the quantitative capsule, and the quantitative capsule changes from a contracted state to an extended state, sucking liquid from the liquid inlet pipe into the quantitative capsule, and the quantitative capsule changes from an extended state to a contracted state, squeezing the liquid out of the quantitative capsule and discharging it through the liquid outlet pipe, thereby solving the technical problem that the gas in the gas bin of the metering pump will flow into the liquid bin and affect the liquid. The utility model also proposes to install a first in-position sensor and a second in-position sensor at the first preset position and the second preset position in the first chamber, so that it can judge whether the driving mechanism has reached the specified preset position. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a schematic diagram of the internal structure of an embodiment of the utility model;

[0027] Figure 2 It is a three-dimensional structural schematic diagram of an embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of a three-dimensional structure from another perspective of an embodiment of the utility model;

[0029] Figure 4 A side view of an embodiment of the utility model;

[0030] Figure 5 It is a rear view of an embodiment of the utility model;

[0031] Figure 6 A bottom view of an embodiment of the utility model;

[0032] 1. Shell; 101. First chamber; 102. Second chamber;

[0033] 2. Quantitative capsule;

[0034] 31. Liquid outlet pipe; 32. Liquid inlet pipe;

[0035] 41. Liquid outlet one-way valve; 42. Liquid inlet one-way valve;

[0036] 51, anterior trachea; 52, posterior trachea;

[0037] 61. Block valve; 62. Push rod;

[0038] 7. Pull plate assembly;

[0039] 81, a first in-position sensor; 82, a second in-position sensor;

[0040] 9. Connector; 91. Liquid inlet; 92. Liquid outlet;

[0041] 10. Limiting block; 11. Sealing ring; 12. Bottom plate assembly;

[0042] 13. Exhaust port. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] The principle and structure of the present utility model are described in detail below with reference to the accompanying drawings and embodiments.

[0045] A metering pump is a hydraulic pump in which the volume of oil discharged by the pump (i.e. displacement) remains fixed when the pump shaft rotates one circle. It has a simpler structure than a variable displacement pump and is widely used. It is usually used to pump out special liquids.

[0046] In addition, existing metering pumps usually adopt a design in which the gas chamber and the quantitative chamber are separated. The liquid in the quantitative chamber is pushed out by a push rod pushing the sealing disk in the quantitative chamber. The push rod connects the liquid chamber and the gas chamber. Since the push rod needs to slide in the two chambers, there is a gap between the two chambers. The gas in the gas chamber of the traditional metering pump will flow into the liquid chamber, affecting the normal use of the liquid chamber.

[0047] like Figure 1-6 As shown, the utility model proposes a metering pump, including: a housing 1, a quantitative capsule 2, a connector 9 and a motion mechanism. The housing 1 is divided into a first chamber 101 and a first chamber 102 in sequence. The first chamber 101 is used to install the motion mechanism, and the first chamber 102 is used to install the quantitative capsule 2. The quantitative capsule 2 is used to quantify the amount of liquid, and the push rod 62 of the motion mechanism seals the first chamber 101 and the first chamber 102. Through the movement of the motion mechanism, the quantitative capsule 2 changes from a compressed state to an extended state, and the liquid is sucked into the quantitative capsule 2 from the liquid inlet pipe 32 of the connector 9. The quantitative capsule 2 changes from an extended state to a compressed state, and the liquid is discharged from the liquid outlet pipe 31 of the connector 9. The push rod 62 will not directly contact the liquid, and even if the gas in the first chamber 101 enters the first chamber 102, it will not affect the normal use of the liquid tank.

[0048] In the specific embodiment, the housing 1 is divided into a first chamber 101 and a second chamber 102 from left to right. The housing 1 is provided with a front air intake duct 51 and a rear air intake duct 52 communicating with the first chamber 101, and the front air intake duct 51 is on the left side of the rear air intake duct 52.

[0049] The quantitative capsule 2 is a compressible structure, similar to an accordion pleated structure, which can be compressed and stretched. The quantitative capsule 2 is installed horizontally in the first chamber 102 so that the quantitative capsule 2 can be compressed or stretched horizontally.

[0050] The connector 9 is connected to the housing 1, specifically to the end of the first chamber 102. The connector 9 is provided with a liquid inlet pipe 32 and a liquid outlet pipe 31 which can be communicated with the quantitative capsule 2, and the liquid inlet pipe 32 is provided with a liquid inlet check valve 42, and the liquid outlet pipe 31 is provided with a liquid outlet check valve 41. When the quantitative capsule 2 changes from a compressed state to an extended state, liquid is sucked into the quantitative capsule 2 from the liquid inlet pipe 32. Since the liquid inlet pipe 32 is provided with a liquid inlet check valve 42, the liquid exists in the quantitative capsule 2. When the quantitative capsule 2 changes from an extended state to a compressed state, the liquid stored in the quantitative capsule 2 is discharged from the liquid outlet pipe 31.

[0051] The motion mechanism is installed in the first chamber 101 and can move transversely in the first chamber 101. One end of the push rod 62 of the motion mechanism is in the first chamber 101, and the other end extends into the first chamber 102 to seal the first chamber 101 and the first chamber 102. The push rod is interference fit with the first chamber and the second chamber. The end of the push rod 62 extending into the first chamber 102 is connected to the quantitative capsule 2, so that when the motion mechanism moves in the first chamber 101, the push rod 62 drives the quantitative capsule 2 to compress or stretch.

[0052] During use, the front air pipe 51 is first closed, and the rear air pipe 52 is opened. Gas is injected into the first chamber 101 from the rear air pipe 52. The pressure on the right side of the moving mechanism in the first chamber 101 increases, pushing the moving mechanism to move to the left. The pushing mechanism moves from the second preset position to the first preset position. The push rod 62 pulls the quantitative capsule 2 from the compressed state to the extended state, and the liquid is sucked into the quantitative capsule 2 from the liquid inlet pipe 32. After the pushing mechanism moves to the first preset position, the gas is discharged from the rear air pipe 52, and then the rear air pipe 52 is closed, and the front air pipe 51 is opened. Gas enters the first chamber 101 from the front air pipe 51. The pressure on the left side of the moving mechanism in the first chamber 101 increases, pushing the moving mechanism to move to the right. The pushing mechanism moves from the first preset position to the second preset position. The push rod 62 pushes the quantitative capsule 2 from the extended state to the compressed state, and the liquid is discharged from the liquid discharge pipe.

[0053] In a further embodiment, the housing 1 includes a first housing provided with a first chamber 101 and a second housing provided with a first chamber 102 , and the first housing and the second housing are spliced ​​to form the housing 1 .

[0054] The liquid inlet pipe 32 and the liquid outlet pipe 31 of the connector 9 extend outwards. When the connector 9 is connected to the housing 1 , the liquid inlet pipe 32 and the liquid outlet pipe 31 extend into the first chamber 102 and communicate with the quantitative capsule 2 .

[0055] Electromagnetic switches are provided at the front air intake pipe 51 and the rear air intake pipe 52 to control the opening and closing of the front air intake pipe 51 and the rear air intake pipe 52 .

[0056] The motion mechanism specifically includes: a blocking valve 61 and a push rod 62. The blocking valve 61 is connected to the inner wall of the first chamber 101 by interference fit, and the blocking valve 61 can move in the first chamber 101. One end of the push rod 62 is connected to the blocking valve 61. When the blocking valve 61 moves, the push rod 62 is driven to move. The other end of the push rod 62 extends from the first chamber 101 and then extends into the first chamber 102, so as to compress the quantitative capsule 2 in the first chamber 102.

[0057] The end of the push rod 62 extending into the first chamber 102 may also be provided with a pull plate assembly 7, and the pull plate assembly 7 includes: a fixed portion and a push-pull portion. The fixed portion is in the shape of a circular plate, parallel to the quantitative capsule 2, and its center position is fixed to the end of the push rod 62. The push-pull portion is in the shape of a ring, parallel to the quantitative capsule 2, one side is connected to the fixed portion, and the other side is connected to the quantitative capsule 2. When the push rod 62 drives the push-pull assembly to move, when the push rod 62 moves from the first preset position to the second preset position, that is, moves toward the right first chamber 102, at this time, the interaction force between the push-pull portion and the quantitative capsule 2 increases, compressing the quantitative capsule 2; when the push rod 62 drives the push-pull assembly to move, when the push rod 62 moves from the second preset position to the first preset position, that is, moves toward the left first chamber 101, at this time, the interaction force between the push-pull portion and the quantitative capsule 2 gradually decreases, and the quantitative capsule 2 stretches;

[0058] In a further embodiment, the connector 9 is provided with a liquid inlet 91 which can be communicated with the liquid inlet pipeline 32 and a liquid outlet 92 which can be communicated with the liquid outlet pipeline 31, so as to facilitate the connection of the metering pump with the external pipeline.

[0059] The first chamber 102 is provided with an exhaust port 13 connected to the outside world, and the exhaust port 13 can be arranged at the lower end of the first chamber 102 of the housing 1 and connected to the first chamber 102. During the operation of the metering pump, as the push rod 62 of the motion mechanism repeatedly moves between the first chamber 101 and the first chamber 102, it is impossible to completely avoid that the gas in the first chamber 101 will not run into the first chamber 102, and when the quantitative capsule 2 is repeatedly compressed, gas will also enter the first chamber 102. If the first chamber 102 is completely sealed, when there is too much gas in the first chamber 102, it may affect the compression of the quantitative capsule 2. Therefore, an exhaust port connected to the first chamber 102 is arranged on the housing to discharge the gas in the first chamber 102 in time. The exhaust port 13 can discharge the air in the first chamber 102, so that the pressure in the liquid bin is consistent with the external pressure, and better assist the work of the quantitative capsule 2.

[0060] The first preset position of the metering pump is set on the left side of the blocking valve 61 in the first chamber 101. At this time, when the blocking valve 61 is in the first preset position, the quantitative capsule 2 is in a fully extended state. The second preset position is set on the right side of the blocking valve 61 in the first chamber 101. When the blocking valve 61 moves to the second preset position, the quantitative capsule 2 is in a compressed state. A first in-place sensor 81 is provided at the first preset position, and a second in-place sensor 82 is provided at the second preset position. The first in-place sensor 81 and the second in-place sensor 82 are used to detect whether the blocking valve 61 of the motion mechanism moves to the preset position, so as to know the compression of the quantitative capsule 2 and prevent the liquid in the quantitative capsule 2 from not being the expected volume due to the motion mechanism not moving to the right position.

[0061] A limiting block 10 is provided in the first chamber 101 at a position opposite to the motion mechanism to limit the moving range of the motion mechanism, and the first in-position sensor 81 is installed on the limiting block. The limiting block 10 is provided in the first chamber 101 for sealing.

[0062] Furthermore, the metering pump also includes a base plate assembly 12 for supporting the bottom of the shell 1, and the base plate assembly 12 includes two vertical plates and a horizontal cross plate. The cross plate is placed on the surface to be placed, and the two vertical plates are vertical and fixed to the cross plate at intervals. The top of the vertical plate is fixed to the shell 1 to support the metering pump as a whole.

[0063] Preferably, an annular sealing ring 11 is provided between the limiting block and the inner wall of the first chamber 101 to further seal the first chamber 101 and prevent the gas from escaping from between the limiting block and the housing 1 when the gas is injected into the first chamber 101 .

[0064] Compared with the prior art, the utility model provides a quantitative capsule 2 in the first chamber 102, a driving mechanism in the first chamber 101, and injects or discharges gas into the first chamber 101 through the trachea to drive the motion mechanism to move repeatedly, thereby squeezing the quantitative capsule 2. The quantitative capsule 2 changes from a contracted state to an extended state, and the liquid is sucked into the quantitative capsule 2 from the liquid inlet pipe 32. The quantitative capsule 2 changes from an extended state to a contracted state, and the liquid is squeezed out of the quantitative capsule 2 and discharged through the liquid outlet pipe 31, thereby solving the technical problem that the gas in the first chamber of the metering pump will flow into the second chamber and affect the liquid. The utility model also proposes to install a first in-place sensor 81 and a second in-place sensor at the first preset position and the second preset position in the first chamber 101, so that it can judge whether the driving mechanism has reached the specified preset position, and prevent the driving mechanism from not reaching the specified position and affecting the volume of the liquid sucked and discharged.

[0065] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0066] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0067] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0068] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A metering pump, characterized in that: include: A shell, wherein the shell is divided into a first chamber and a second chamber in sequence, and the shell is provided with a front air pipe and a rear air pipe communicating with the first chamber; A quantitative capsule installed in the second chamber; A connector, the connector is connected to the housing, the connector is provided with a liquid inlet pipe and a liquid outlet pipe connected to the quantitative capsule, the liquid inlet pipe is provided with an inlet one-way valve, and the liquid outlet pipe is provided with a liquid outlet one-way valve; A motion mechanism, wherein the motion mechanism is installed in the first chamber, a push rod of the motion mechanism closes the first chamber and the second chamber, and one end of the push rod extends into the second chamber to connect with the quantitative capsule; When the rear air pipe is opened, gas is injected into the first chamber to push the moving mechanism to move from the second preset position to the first preset position, and the push rod drives the quantitative bag to extend. After the liquid enters the quantitative bag from the liquid inlet pipe, the gas in the first chamber is discharged from the rear air pipe. The front air pipe is opened, and gas is injected into the first chamber through the front air pipe to push the moving mechanism to move from the first preset position to the second preset position, so that the push rod compresses the quantitative bag, and the liquid in the quantitative bag is discharged through the liquid outlet pipe.

2. The metering pump according to claim 1, characterized in that: The motion mechanism comprises: a blocking valve, the blocking valve having an interference fit with the first chamber; A push rod, one end of which is connected to the blocking valve, and the other end of which extends into the second chamber to compress the quantitative capsule.

3. The metering pump according to claim 2, characterized in that: The metering pump also includes a pull plate assembly, one side of which is connected to the push rod, and the other side of which is fixed to the quantitative bag.

4. The metering pump according to claim 1, characterized in that: The second chamber is provided with an exhaust port communicating with the outside.

5. The metering pump according to claim 1, characterized in that: The first preset position is provided with a first in-position sensor, and the second preset position is provided with a second in-position sensor.

6. The metering pump according to claim 5, characterized in that: A limiting block is provided in the first chamber at a position opposite to the motion mechanism to limit the moving range of the motion mechanism, and the first in-position sensor is installed on the limiting block.

7. The metering pump according to claim 1, characterized in that: The shell includes a first shell provided with a first chamber and a second shell provided with a second chamber, and the first shell and the second shell are spliced ​​to form the shell.

8. The metering pump according to claim 1, characterized in that: The metering pump further includes a base plate assembly for supporting the bottom of the housing.

9. The metering pump according to claim 6, characterized in that: A sealing ring is provided between the limiting block and the inner wall of the first chamber.

10. The metering pump according to claim 1, characterized in that: Electromagnetic switches are provided at the front air intake pipe and the rear air intake pipe.

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