Micro-flow odorizing plunger pump

Abstract

The invention discloses a micro-flow odorizing plunger pump which is characterized in that a rotary sleeve and a spiral positioning rod are matched with each other to form a thread pair, the spiral positioning rod is connected with a plunger rod, the plunger rod is sleeved with a spring, and the spring is connected with the spiral positioning rod. The motor drives the spiral sleeve to rotate, the spiral positioning rod is driven to do front-back piston motion through the rotating speed and the lead of the thread pair, the spiral positioning rod is connected with the plunger rod, the diameter of the plunger rod and the stroke of the system determine the minimum step pitch flow and the single-stroke maximum flow of the system, and the output amount of odorizing liquid can be accurately controlled. And the odorization amount is matched with the gas flow. The rotating sleeve and the spiral positioning rod are in spiral contact in one direction through the elastic force of deformation of the spring, the clearance of thread fit is eliminated, and the high precision of the micro odorizing pump is guaranteed. The hardness of the plunger rod is far higher than that of the hard alloy shell, the sapphire material surface roughness is very low, the friction force is very small, meanwhile, the plunger rod is very wear-resistant, and only the sapphire rod needs to be replaced during maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of gas odorization, and particularly to a micro-flow odorization plunger pump. Background Art

[0002] Gas odorization is to add a flavored liquid agent to colorless and odorless gas, so that the gas has a special smell of the agent, to ensure that when the gas leaks, it can be immediately detected by people or instruments. An odorization pump is a metering pump used to quantitatively add odorant to a gas pipeline. The odorization amount of the pump is expressed by the odorization flow rate (unit: mg / h) or the standard odorization amount (unit: mg / m 3 ). The amount of odorization depends on the stroke and odorization frequency of the odorization pump. The larger the stroke (or single injection amount) of the odorization pump and the higher the odorization frequency, the greater the odorization amount. However, there are some problems in the actual process of adding odorant.

[0003] The injection method of the existing odorization system causes the odorant and natural gas flow rates to be mismatched. Under the existing injection conditions, even when adjusted to the minimum injection amount, it far exceeds the reasonable injection amount, resulting in too high an odorant concentration in an environment with a small gas consumption, poor user experience, waste of odorant, and certain impact on the environment. Summary of the Invention

[0004] The purpose of the present invention is to provide a micro-flow odorization plunger pump for the above-mentioned deficiencies, which solves the problem that the injection method of the existing odorization system causes the odorant and natural gas flow rates to be mismatched. Under the existing injection conditions, even when adjusted to the minimum injection amount, it far exceeds the reasonable injection amount, resulting in too high a concentration in an environment with a small gas consumption, poor user experience, waste of odorant, and certain impact on the environment.

[0005] The present invention is realized by the following solution:

[0006] A micro-flow odorization plunger pump includes a housing, which is internally provided with an installation cavity, a stroke cavity, and a solution cavity that are connected to each other in sequence from left to right. The solution cavity is connected to an inlet check valve and an outlet check valve; a spiral sleeve is arranged in the installation cavity with a clearance fit. A spiral positioning rod is arranged in the spiral sleeve, and the right end of the spiral positioning rod extends into the stroke cavity. The spiral positioning rod and the spiral sleeve form a thread pair. The spiral sleeve is connected to a driving mechanism, and the driving mechanism drives the spiral sleeve to rotate, driving the spiral positioning rod to perform a piston movement back and forth through the rotation speed and the lead of the thread pair; a plunger rod, whose left end is connected to the right end of the spiral positioning rod and whose right end extends into the solution cavity with a clearance fit; and a spring, which is sleeved on the plunger rod, located in the stroke cavity, and one end is connected to the spiral positioning rod; wherein, the spiral positioning rod drives the plunger rod to move in the solution cavity to adjust the liquid output volume in the solution cavity.

[0007] Based on the structure of the above-mentioned micro-flow odorization plunger pump, there are two micro-flow odorization plunger pumps. The volume of the solution cavity of one micro-flow odorization plunger pump is smaller than that of the other micro-flow odorization plunger pump, and the solution cavities of the two micro-flow odorization plunger pumps are connected; wherein, the external liquid flows in from the micro-flow odorization plunger pump with the larger-volume solution cavity and flows out from the micro-flow odorization plunger pump with the smaller-volume solution cavity.

[0008] Based on the structure of the above-mentioned micro-flow odorization plunger pump, the volume of the solution cavity of one micro-flow odorization plunger pump is 0.45 times that of the solution cavity of the other micro-flow odorization plunger pump. The two stroke solution cavities alternately inhale and discharge. When optimized to a volume ratio of 0.45 times, the fluctuation of the solution flow rate is the smallest.

[0009] Based on the structure of the above-mentioned micro-flow odorization plunger pump, the spiral positioning rod and the plunger rod are coaxially arranged.

[0010] Based on the structure of the above-mentioned micro-flow odorization plunger pump, the outer diameter of the spiral positioning rod is larger than the outer diameter of the plunger rod. The cavity formed after the part of the left end of the plunger rod placed in the stroke cavity is fitted with the stroke cavity is used to accommodate the spring. One end of the spring is connected to the spiral positioning rod, and the other end is connected to the inner wall of the stroke cavity.

[0011] Based on the structure of the above-mentioned micro-flow odorization plunger pump, the housing is made of cemented carbide.

[0012] Based on the structure of the above-mentioned micro-flow odorization plunger pump, the plunger rod is a sapphire plunger rod.

[0013] Based on the structure of the above-mentioned micro-flow odorization plunger pump, the driving mechanism is a motor.

[0014] Based on the structure of the above-mentioned micro-flow odorant injection plunger pump, the inlet check valve is arranged at the right end of the solution chamber and is coaxially arranged with the solution chamber, and the outlet check valve is located on the side of the solution chamber.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0016] 1. For the micro-flow odorant injection plunger pump of this solution, the rotating sleeve and the spiral positioning rod cooperate with each other to form a thread pair. The spiral positioning rod is connected to the plunger rod, and a spring is sleeved on the plunger rod. The spring is connected to the spiral positioning rod. The motor drives the spiral sleeve to rotate, and drives the spiral positioning rod to perform a reciprocating piston motion through the rotation speed and the lead of the thread pair. The spiral positioning rod is connected to the plunger rod. The diameter of the plunger rod and the stroke of the system determine the minimum step flow rate and the maximum single-stroke flow rate of the system, and can more accurately control the output volume of the odorant liquid, so that the odorant addition amount matches the gas flow rate. The elastic force of the spring deformation keeps the rotating sleeve and the spiral positioning rod in a spiral contact in one direction, eliminates the clearance of the thread fit, and ensures the high precision of the micro-odorant injection pump. The hardness of the plunger rod is much higher than that of the hard alloy housing, and the surface roughness of the sapphire material is very low. It has very little friction and is very wear-resistant. During maintenance, only the sapphire rod needs to be replaced, which is convenient for maintenance and has a long service life.

[0017] 2. When using the micro-flow odorant injection plunger pump of this solution for odorant injection, the consumption of the odorant is much lower than that of the products in the existing market. It can save a large amount of odorant consumption for the company's production and operation every year. At the same time, the power consumption of the product is also much smaller than that of similar products, and the power consumption during use is also significantly lower than that of existing products. The working frequency can reach 1200 times / minute, which is much higher than the frequency of similar products in the market (200 times / minute). In this way, although the single output flow rate is very small, due to the doubling of the working frequency, the flow rate range of the present invention is not lower than that of similar products in the market. Due to the low-power design, the power of the plunger pump is only 40W, and its volume and weight are much smaller than those of similar products. It has the application scenarios that other products in the market cannot achieve, such as being designed to be portable and powered by other green energy sources such as solar energy and wind energy. At the same time, the linearity of the work of the present invention can reach more than 0.99, which is much higher than the linearity of the products in the existing market, and has incomparable advantages in realizing precise odorant injection.

[0018] 3. The micro - flow odorant - adding plunger pump of this solution is equipped with two micro - flow odorant - adding plunger pumps with the same structure. The solution chamber of the lower micro - flow odorant - adding plunger pump is 0.45 times that of the upper one. The plunger rods above and below alternately perform piston movements. The volume of the lower solution chamber is 0.45 times that of the upper one. During the forward stroke of the upper one, half of the liquid is sucked in by the suction stroke of the lower piston, and the other half is discharged through the discharge port. During the suction stroke of the upper one, the lower piston rod is in the forward stroke, discharging the liquid inhaled last time. The whole process ensures continuous liquid outflow. When the small - volume chamber is 0.45 times that of the other chamber, the fluid fluctuation is the smallest. This enables the odorant - adding system to always be in a continuous working state, improving work efficiency and making the operation of the odorant - adding system coherent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the micro - flow odorant - adding plunger pump of the present invention;

[0020] Figure 2 is a schematic structural diagram of Embodiment 2 of the present invention;

[0021] Reference numerals in the figures: 1. Housing; 11. Installation cavity, 12. Stroke cavity, 13. Solution cavity; 2. Rotary sleeve; 3. Spiral positioning rod; 4. Spring; 5. Plunger rod; 6. Inlet check valve; 7. Outlet check valve; 8. Motor; 9. Lower micro - flow odorant - adding plunger pump, 91. Solution chamber, 92. Connection cavity; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] All the features disclosed in this specification, or all the steps in any disclosed method or process, except for mutually exclusive features and / or steps, can be combined in any way.

[0023] Any feature disclosed in this specification (including any additional claims, abstract) can be replaced by other equivalent or similar - purpose alternative features unless specifically stated otherwise. That is, unless specifically stated, each feature is only an example in a series of equivalent or similar features.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a predetermined orientation, be constructed and operated in a predetermined orientation, and thus should not be construed as a limitation of the present invention.

[0025] Furthermore, terms such as "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more such features.

[0026] Embodiment 1

[0027] As Figure 1 shown, the present invention provides a technical solution:

[0028] A micro - flow odorant - adding plunger pump, which at least includes but is not limited to a housing 1. Inside the housing 1, a rotating sleeve 2, a spiral positioning rod 3, a spring 4, a plunger rod 5, an inlet check valve 6 and an outlet check valve 7 are sequentially installed from left to right. A motor 8 is connected to the rotating sleeve 2 to drive the rotating sleeve 2 to rotate.

[0029] The specific structure is as follows: The housing is made of cemented carbide material (for example, tungsten - cobalt - titanium alloy). There is a cavity inside the housing 1. From left to right, the cavity is sequentially provided with a connected installation cavity 11, a stroke cavity 12 and a liquid - containing cavity 13. The solution cavity 13 is communicated with the inlet check valve 6 and the outlet check valve 7. Among them, the inner diameter of the liquid - containing cavity 13 is smaller than that of the stroke cavity 12, and the liquid - containing cavity 13 and the stroke cavity 12 form a T - shaped cavity. The inlet check valve 6 is arranged at the right end of the liquid - containing cavity and is coaxially arranged with the liquid - containing cavity 13. The outlet check valve 7 is located on the lower side of the liquid - containing cavity 13. The liquid medicine enters the liquid - containing cavity 13 through the inlet check valve 6 and flows out of the liquid - containing cavity 13 through the outlet check valve 7 for odorant addition.

[0030] The spiral sleeve 2 is arranged in the installation cavity 11 and is in clearance fit with the installation cavity 11. The left end of the spiral sleeve 2 extends out of the installation cavity 11. A spiral positioning rod 3 is arranged in the spiral sleeve 2. The right end of the spiral positioning rod 3 extends into the stroke cavity 12. The spiral positioning rod 3 and the spiral sleeve 2 form a thread pair. The left end of the spiral sleeve 2 is connected to the driving mechanism (motor 8). The motor 8 drives the spiral sleeve 2 to rotate, and drives the spiral positioning rod 3 to perform a piston movement back and forth through the rotation speed and the lead of the thread pair. A plunger rod 5 is installed at the right end of the spiral positioning rod 3. The right end of the plunger rod 5 extends into the liquid storage cavity 13 and is in clearance fit. The clearance fit enables the plunger rod 5 to move in the liquid storage cavity 13. The left end of the plunger rod 5 is detachably connected to the spiral positioning rod 3, which is convenient for replacement after the plunger rod 3 is worn. Preferably, the plunger rod 5 is a sapphire plunger rod. The hardness of the sapphire plunger rod 5 is much higher than that of the cemented carbide housing 1, and the surface roughness of the sapphire material is very low. It has very little friction and is very wear-resistant. During maintenance, only the sapphire rod needs to be replaced, which is convenient for maintenance and has a long service life. A spring 4 is sleeved on the left side part of the plunger rod 5. The spring 4 is located in the stroke cavity 12. The left end of the spring 4 is connected to the spiral positioning rod 3. Among them, in the state of stopping liquid addition, the right end of the plunger rod 5 fits with the outlet of the inlet check valve 6 to block the outlet; the side rod body of the plunger rod 5 fits with the inlet of the outlet check valve 7 to block the inlet. During the liquid addition state, the plunger rod 5 moves to the left, opening the inlet check valve 6 and the outlet check valve 7. The liquid medicine enters the liquid storage cavity 13 through the inlet check valve 6 and flows out of the liquid storage cavity 13 through the outlet check valve 7 for liquid addition.

[0031] The working process of the micro-flow odorant injection plunger pump of the present invention is as follows:

[0032] The motor 8 provides power to drive the rotating sleeve 2 to rotate. The rotating sleeve 2 and the spiral positioning rod 3 form a thread pair. The spiral positioning rod 3 is driven to perform a piston movement back and forth through the rotation speed and the lead of the thread pair. The spiral positioning rod 3 is connected to the sapphire plunger rod 5. The diameter of the sapphire plunger rod 5 and the stroke of the system determine the minimum step flow rate and the maximum single-stroke flow rate of the system. The plunger rod 5 is driven by the spiral positioning rod 3 to move in the liquid storage cavity 13 to adjust the liquid output volume in the liquid storage cavity 13. The liquid output volume of the odorant is controlled by the diameter and stroke of the plunger rod 5, and the output volume of the odorant liquid can be controlled more accurately, so that the odorant addition amount matches the gas flow rate.

[0033] When the sapphire plunger rod 5 moves to the left, the inlet check valve 6 opens and the outlet check valve 7 closes, and the system draws liquid from the outside, and the liquid enters the solution chamber 13. When the sapphire plunger rod 5 moves to the right, the inlet check valve 6 closes and the outlet check valve 7 opens, and the system discharges liquid to the outside. The elastic force generated by the deformation of the spring 4 keeps the rotating sleeve 2 and the spiral positioning rod 3 in spiral contact in one direction, eliminating the clearance of the thread fit and ensuring the high precision of the micro-dosing pump. The hardness of the sapphire plunger rod 5 is much higher than that of the cemented carbide housing, and the surface roughness of the sapphire material is very low. It has very little friction and is very wear-resistant. During maintenance, only the sapphire rod needs to be replaced, which is convenient for maintenance and has a long service life.

[0034] Preferably, the spiral positioning rod 3 and the plunger rod 5 are coaxially arranged. The coaxial arrangement is conducive to the movement of the plunger rod in the linear direction to be consistent with the spiral positioning rod 3, reducing the collision and friction between the plunger rod 5 and the inner wall of the stroke chamber, and prolonging the service life of the plunger rod 5.

[0035] Preferably, the outer diameter of the spiral positioning rod 3 is larger than the outer diameter of the plunger rod 5. The part of the left end of the plunger rod 5 placed in the stroke chamber 13 forms a cavity for accommodating the spring 4 after being fitted with the stroke chamber 13. One end of the spring 4 is connected to the spiral positioning rod 3, and the other end is connected to the inner wall of the stroke chamber 13. That is, the spring 4 and the spiral positioning rod 3 are coaxially arranged. The elastic force generated by the deformation of the spring 4 keeps the rotating sleeve 2 and the spiral positioning rod 3 in spiral contact in one direction, eliminating the clearance of the thread fit and ensuring the high precision of the micro-dosing pump.

[0036] Embodiment 2

[0037] As Figure 2 shown, the difference between this embodiment and Embodiment 1 is that there are two micro-flow dosing plunger pumps, which are arranged parallel to each other up and down. The structures of the two micro-flow dosing plunger pumps are the same, that is, the upper micro-flow dosing plunger pump and the lower micro-flow dosing plunger pump 9.

[0038] In this embodiment, the volume of the solution chamber 91 of the lower micro-flow dosing plunger pump is smaller than the volume of the solution chamber 13 of the upper micro-flow dosing plunger pump. The solution chambers 13 and 92 of the two micro-flow dosing plunger pumps are connected through a connecting chamber 92. An outlet check valve 7 is provided at one end of the connecting chamber 92 close to the outlet of the solution chamber of the upper micro-flow dosing plunger pump, and an inlet check valve is provided at the liquid inlet of the solution chamber 92 of the lower micro-flow dosing plunger pump. The solution chamber 92 of the lower micro-flow dosing plunger pump is connected to the outlet check valve. The external liquid medicine flows in from the upper micro-flow dosing plunger pump with a larger volume solution chamber and flows out from the micro-flow dosing plunger pump with a smaller volume solution chamber. Preferably, the volume of the solution chamber 91 of the lower micro-flow dosing plunger pump is half of the volume of the solution chamber 13 of the upper micro-flow dosing plunger pump.

[0039] The working process of the micro - flow odorant - adding plunger pump of the present invention is as follows: Liquid medicine in a liquid state from the outside flows into the upper micro - flow odorant - adding plunger pump with a relatively large - volume solution chamber. The upper plunger rod and the lower plunger rod alternately perform piston movements. The volume of the lower solution chamber is 0.45 times that of the upper solution chamber. During the forward stroke of the upper part, half of the liquid is sucked in by the suction stroke of the lower piston, and the other half is discharged through the discharge port. During the suction stroke of the upper part, the lower piston rod is in the forward stroke, discharging the liquid sucked in the previous time. The whole process ensures that the liquid flows out continuously, enabling the odorant - adding system to always be in a continuous working state, improving work efficiency, and making the operation of the odorant - adding system coherent.

[0040] The above - mentioned are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A micro-flow odorant injection plunger pump, characterized in that: It includes a housing, inside which there are successively arranged, from left to right, an installation cavity, a stroke cavity and a solution cavity that are interconnected. The solution cavity is communicated with an inlet check valve and an outlet check valve; a spiral sleeve, which is arranged in the installation cavity with a clearance fit. A spiral positioning rod is arranged in the spiral sleeve, and the right end of the spiral positioning rod extends into the stroke cavity. The spiral positioning rod and the spiral sleeve form a screw pair. The spiral sleeve is connected to a driving mechanism, and the driving mechanism drives the spiral sleeve to rotate, driving the spiral positioning rod to perform a piston movement back and forth through the rotation speed and the lead of the screw pair; a plunger rod, the left end of which is connected to the right end of the spiral positioning rod, and the right end extends into the solution cavity with a clearance fit; and a spring, which is sleeved on the plunger rod and is located in the stroke cavity, with one end connected to the spiral positioning rod; wherein, the spiral positioning rod drives the plunger rod to move in the solution cavity to adjust the liquid output volume in the solution cavity.

2. The micro-flow odorant injection plunger pump according to claim 1, characterized in that: There are two micro-flow odorization plunger strokes, and the solution volume of one of the micro-flow odorization plunger strokes is less than that of the other micro-flow odorization plunger stroke. The solution cavities of the two micro-flow odorization plunger pumps are communicated. Among them, the external liquid flows into the micro-flow odorization plunger pump with the solution cavity of a larger volume and flows out from the micro-flow odorization plunger pump with the solution cavity of a smaller volume.

3. The micro-flow odorant injection plunger pump according to claim 2, characterized in that: The volume of the solution cavity of one of the micro-flow odorization plunger pumps is 0.45 times that of the solution cavity of the other micro-flow odorization plunger pump.

4. The micro-flow odorant injection plunger pump according to claim 1, characterized in that: The spiral positioning rod and the plunger rod are coaxially arranged.

5. The micro-flow odorant injection plunger pump according to claim 1, characterized in that: The outer diameter of the spiral positioning rod is larger than that of the plunger rod. The cavity formed after the part of the left end of the plunger rod placed in the stroke cavity is fitted with the stroke cavity is used to accommodate the spring. One end of the spring is connected to the spiral positioning rod, and the other end is connected to the inner wall of the stroke cavity.

6. The micro-flow odorant injection plunger pump according to claim 1, characterized in that: The housing is made of cemented carbide.

7. The micro-flow odorant injection plunger pump according to claim 1, characterized in that: The plunger rod is a sapphire plunger rod.

8. The micro-flow odorant injection plunger pump according to claim 1, characterized in that: The driving mechanism is a motor.

9. The micro-flow odorant injection plunger pump according to claim 1, characterized in that: The inlet check valve is arranged at the right end of the solution cavity and is coaxially arranged with the solution cavity. The outlet check valve is located on the side of the solution cavity.

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