Liquid continuous quantitative delivery piston pump

Abstract

The present invention relates to the field of fluid machinery. The purpose is to provide a liquid continuous quantitative delivery piston pump, which can continuously and quantitatively deliver liquids of any viscosity, other fillers can be added to the liquid, the structure is simple, and the service life is long. The technical solution is: a liquid continuous quantitative delivery piston pump, characterized in that: the liquid continuous quantitative delivery piston pump includes a pump body with an upper end cover, a lower end cover and a cylinder body, a piston rod slidably positioned in the cylinder body, a reversing channel connecting the upper end cover and the lower end cover, and a reversing component installed in the lower end cover, the reversing component connects the reversing channel and the cylinder body respectively, and the upper end cover and the lower end cover are respectively provided with a discharge port and a feed port.

Description

Technical Field

[0001] The invention relates to the field of fluid machinery, in particular to a continuous quantitative delivery piston pump in a liquid delivery machinery. The piston pump can realize continuous quantitative delivery of liquids with any viscosity. Background Art

[0002] In recent years, with the rapid development of the global automotive, electronics, construction, energy, shipbuilding and other fields, the demand and demand standards for liquid materials such as glue, lubricating oil, liquid coatings, etc. required in the field are also gradually increasing, and liquid delivery pumps have developed rapidly; at present, the common liquid delivery pumps on the market mainly include gear pumps, screw pumps and plunger pumps. Although gear pumps can realize continuous liquid delivery, other solid fillers cannot be added to the liquid, screw pumps cannot be used for high-viscosity fluids, and plunger pumps cannot achieve pulsation-free continuous delivery of liquids. Their use is limited by factors such as the viscosity of the delivered liquid and the large fluctuations in liquid flow during reversing delivery; therefore, inventing a delivery pump with a simple structure, a long service life, and the ability to continuously and quantitatively deliver liquids of any viscosity can conform to the development trends of major industries and meet their development needs. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned background technology and to provide a liquid continuous quantitative delivery piston pump, which can continuously and quantitatively deliver liquids of any viscosity, other fillers can be added into the liquid, has a simple structure and a long service life.

[0004] The present invention adopts the following technical scheme: a liquid continuous quantitative delivery piston pump, characterized in that: the liquid continuous quantitative delivery piston pump includes a pump body with an upper end cover, a lower end cover and a cylinder body, a piston rod slidably positioned in the cylinder body, a reversing channel connecting the upper end cover and the lower end cover, and a reversing component installed in the lower end cover, the reversing component respectively connects the reversing channel and the cylinder body, and the upper end cover and the lower end cover are respectively provided with a discharge port and a feed port.

[0005] The upper end cover and the lower end cover are both provided with cavities communicated with the cylinder body, the discharge port is communicated with the cavity of the upper end cover, and the feed port is communicated with the cavity of the lower end cover.

[0006] An upper flood plug unit slidably matched with the piston rod is installed at the cavity of the upper end cover; a lower flood plug unit slidably matched with the cylinder body is installed at the lower part of the piston rod.

[0007] The upper flood-plug unit comprises an upper flood-plug fixing seat with a cylindrical cavity coaxially arranged with the piston rod, an upper flood-plug fixing ring and an upper flood-plug which are sequentially sleeved with the piston rod in the axial direction of the piston rod, and an upper flood-plug pressing seat which presses the upper flood-plug fixing ring and the upper flood-plug tightly into the cylindrical cavity of the upper flood-plug fixing seat.

[0008] The lower flood seal unit comprises a lower flood seal fixing ring and a lower flood seal which are sequentially sleeved on the lower part of the piston rod in the axial direction of the piston rod, and a lower flood seal fixing seat which fixes the lower flood seal fixing ring and the lower flood seal to the lower end of the piston rod.

[0009] The reversing assembly includes two left and right reversing ball valves installed in the cavity of the lower end cover and connected to each other; the left end outlet of the left reversing ball valve is closed by a clamping nut, the circumferential surface outlet is connected to the reversing channel, and the right end inlet is connected to the left end outlet of the right reversing ball valve; the right end inlet of the right reversing ball valve is connected to the feed port, and the circumferential surface outlet is connected to the cylinder body.

[0010] The reversing ball valve comprises a reversing sleeve with a horizontally arranged axis, a reversing ball positioning seat located on the right end surface of the reversing sleeve, a positioning ball movably positioned in the reversing sleeve, and a compression spring that pushes the positioning ball toward the reversing ball positioning seat.

[0011] Preferably, the cross-sectional area of ​​the piston rod is 1 / 2 of the inner hole area of ​​the cylinder body.

[0012] Preferably, the upper flood plug and the lower flood plug are both made of soft material.

[0013] The beneficial effects of the present invention are as follows: the present invention has a simple structure, is stable and reliable, can continuously and quantitatively transport liquids of any viscosity, improves work efficiency, and other fillers can be added to the liquid without affecting the service life. When the piston of the present invention transports the liquid in both directions, the fluctuation of the transport volume in the two processes is small. While meeting the continuous and quantitative transport of liquid materials such as glue, lubricating oil, and liquid coatings in various industries, it can also effectively improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a main structural schematic diagram of the present invention.

[0015] Figure 2 It is a three-dimensional structural schematic diagram of the present invention.

[0016] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure.

[0017] Figure 4 It is a three-dimensional structural schematic diagram of the piston rod in the present invention.

[0018] Figure 5 It is an exploded schematic diagram of the reversing component in the present invention.

[0019] Figure 6 It is a schematic diagram of a working state of the present invention.

[0020] Figure 7 It is the second schematic diagram of the working state of the present invention.

[0021] Figure 8 It is the third schematic diagram of the working state of the present invention.

[0022] Fig. 9 It is four schematic diagrams of the working state of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0024] Figure 1 The liquid continuous quantitative delivery piston pump shown includes a pump body 1-2 with a cylinder body, a piston rod 2 slidably positioned in the cylinder body, an upper end cover 1-3 located at one end of the cylinder body and provided with a discharge port, a lower end cover 1-4 located at the other end of the cylinder body and provided with a feed port, a reversing channel 4 connecting the discharge port and the lower end cover, and a reversing assembly 3 installed in the lower end cover, wherein the reversing assembly connects the reversing channel, the cylinder body and the feed port.

[0025] Figure 2 In the pump body shown, the upper end cover and the lower end cover are connected by a plurality of support columns 1-1 and are fixed at the upper and lower ends of the cylinder body respectively; Figure 6 As shown, both the upper end cover and the lower end cover are provided with cavities inside and are communicated with the cylinder body, the left end of the upper end cover is provided with a discharge port communicated with the internal cavity, and the right end of the lower end cover is provided with a feed port communicated with the internal cavity.

[0026] Figure 3 The piston rod 2-1 is slidably matched with the upper floodgate unit installed on the upper end cover, and the lower part of the piston rod is installed with a lower floodgate unit.

[0027] like Figure 3-Figure 4 As shown, in the upper flood-plug unit, the upper flood-plug fixing seat 2-2-1 is fixed on the upper part of the upper end cover, and a cylindrical cavity is provided inside the upper flood-plug fixing seat; the upper flood-plug fixing ring 2-2-2 and the upper flood-plug 2-2-3 are arranged in the cylindrical cavity from top to bottom in the axial direction of the piston rod, and are sleeved on the piston rod to slide with the piston rod; the upper flood-plug pressing seat 2-2-4 is fixed on the upper part of the upper flood-plug fixing seat, and the upper flood-plug fixing ring and the upper flood-plug are pressed tightly inside the cylindrical cavity of the upper flood-plug fixing seat.

[0028] like Figure 3-Figure 4As shown, in the lower universal plug unit, the lower universal plug fixing ring 2-3-2 and the lower universal plug 2-3-3 are fixed to the lower side of the shaft shoulder 2-3-4 at the lower end of the piston rod (sleeved on the piston rod from bottom to top along the axial direction of the piston rod), and the lower universal plug fixing seat 2-3-1 fixes the lower universal plug fixing ring and the lower universal plug to the lower end of the piston rod (through a threaded structure) (the boss portion of the lower universal plug fixing seat has a diameter greater than the diameter of the piston rod; when the screw rod of the lower universal plug fixing seat is screwed into the screw hole of the piston rod, the boss portion presses and fixes the lower universal plug fixing ring and the lower universal plug to the lower end surface of the shaft shoulder).

[0029] like Figure 3 As shown, the reversing assembly includes two reversing ball valves 3-1 installed in the cavity of the lower end cover and connected to each other (the clamping nut 3-2 is sealed and fixed to the left end screw of the cavity of the lower end cover through a sealing ring, and the two reversing ball valves are pressed into the cavity of the lower end cover). The left end outlet of the reversing ball valve on the left side is closed by the clamping nut, and the circumferential surface outlet (by Figure 5 It can be seen that there are four circumferential surface outlets) connected to the reversing channel, the right end inlet is connected to the left end outlet of the right reversing ball valve; the right end inlet of the right reversing ball valve is connected to the feed port, and the circumferential surface outlet (by Figure 5 It can be seen that there are four circumferential surface outlets) connected to the cylinder body.

[0030] like Figure 5 As shown, in the reversing ball valve, the axis of the reversing sleeve 3-1-1 is arranged horizontally, the reversing ball positioning seat 3-1-2 is located on the right end surface of the reversing sleeve, the positioning ball 3-1-3 can be movably positioned in the reversing sleeve, and the compression spring 3-1-4 pushes the positioning ball toward the reversing ball positioning seat.

[0031] Preferably, the upper flood plug and the lower flood plug are both made of soft material; further preferably, the soft material is rubber.

[0032] Preferably, the cross-sectional area of ​​the piston rod is 1 / 2 of the inner hole area of ​​the cylinder body.

[0033] The working principle of the present invention is: the present invention can continuously and quantitatively transport liquid materials during the working process; the following selection Figure 6-Figure 9 The working principle of the present invention is described;

[0034] Figure 6State shown: the piston rod is fully pushed into the pump body by an external driving component (not shown in the figure), the feed port maintains a certain inlet pressure, the reversing ball in the right reversing ball valve is pushed to the right end of the reversing ball valve under the action of the compression spring and the liquid pressure in the cavity of the lower end cover, and fits tightly with the inner hole edge of the reversing ball positioning seat, and the feed port is closed; the reversing ball in the left reversing ball valve is pushed to the left end of the reversing ball valve under the action of the liquid pressure in the cavity of the lower end cover; the internal cavities of the upper and lower end covers, the reversing channel, and the annular space between the piston rod and the inner wall of the cylinder body are all filled with liquid materials.

[0035] Figure 7 State shown: when the piston rod is pulled out under the action of the external driving component, the liquid material in the annular space formed by the piston rod and the inner wall of the cylinder body is squeezed upward, and under the sealing action of the upper flood plug, the liquid material is transported to the discharge port through the internal cavity of the upper end cover (as shown by the liquid material transport arrow in the upper end cover cavity); while the liquid material is being transported to the discharge port, it passes through the reversing channel, which increases the internal pressure of the liquid in the reversing channel, pushes the reversing ball in the left reversing ball valve to move toward the right end of the reversing ball valve, and fits tightly with the inner hole edge of the reversing ball positioning seat, the right end inlet of the left reversing ball valve is closed, and the liquid material in the reversing channel cannot flow into the cylinder body through the right reversing ball valve, and the liquid material in the annular space between the piston cylinder and the inner wall of the cylinder body is completely transported to the discharge port; at the same time, the space in the cylinder body increases, the pressure of the liquid material decreases, and the inlet pressure of the feed port pushes the reversing ball of the right reversing ball valve to move to the left side of the reversing ball valve, the feed port is opened, and the liquid material enters the cylinder body through the cavity of the lower end cover (in the direction shown by the arrow).

[0036] Figure 8 State shown: When the piston rod pushes the pump body under the action of the external driving component, the liquid pressure in the cylinder body increases, pushing the reversing ball in the right reversing ball valve to move to the right side of the reversing ball valve and fits tightly with the inner hole edge of the reversing ball positioning seat, and the feed port is closed; the reversing ball of the left reversing ball valve moves to the left under the push of the liquid pressure, and the feed port of the left reversing ball valve is opened. The liquid material in the cylinder body passes through the left reversing ball valve and the reversing channel and is transported to the discharge port ( Figure 8 The liquid material is transported in the cavity of the middle and lower end covers as shown by the arrows; since the discharge port is connected to the annular space formed by the piston rod and the inner wall of the cylinder body through the internal cavity of the upper end cover, a part of the liquid material is transported into the annular space when being transported to the discharge port (as shown by the arrows). Figure 8 The liquid material is transported in the cavity of the middle and upper end cover as indicated by the arrow).

[0037] Fig. 9 State shown: When the piston rod is fully pushed into the pump body by the external driving component, the piston pump returns to Figure 6 The status shown; so follow Figures 6 to 9 The state shown is repeated repeatedly to achieve continuous transportation of liquid materials.

[0038] From the above work process, we can see that Figure 7 The state shown transports the material in the annular space between the piston rod and the inner wall of the cylinder body to the discharge port. Figure 8 In the state shown, part of the liquid material in the cylinder is transported to the discharge port, and the other part of the liquid material is transported to the annular space between the piston rod and the inner wall of the cylinder body; since the cross-sectional area of ​​the piston rod is 1 / 2 of the area of ​​the inner hole of the cylinder body, and the volume of the annular space between the piston rod and the inner wall of the cylinder body is 1 / 2 of the volume of the cylinder body, Figure 8 1 / 2 of the liquid in the middle cylinder is transported to the discharge port, and 1 / 2 is transported to the annular space; Figure 7 The working process is to transport the liquid material in the annular space, which occupies 1 / 2 of the cylinder volume, to the discharge port. Figure 7 and Figure 8 The working process conveys equal amounts of liquid materials, that is, the present invention can realize continuous quantitative conveying of liquid.

[0039] like Figure 7 and Figure 8 The piston rod is pulled out and pushed in at the same speed, so the two working processes both convey quantitative materials at a uniform speed and in the same time, and the flow rates of the materials conveyed in the two working processes are the same, that is, the present invention can realize continuous equal flow rate conveying of liquid.

[0040] The present invention has a simple structure and can continuously and quantitatively transport liquids of any viscosity at an equal flow rate. Under the action of the left and right reversing ball valves and when the cross-sectional area of ​​the piston rod and the inner hole area of ​​the cylinder body meet a specific relationship, the volume fluctuation of the transported liquid during the two working processes of pulling out and pushing in the piston rod is small. A single working process of the present invention can also meet the liquid transportation within a larger volume span, and can meet the needs of the automotive, electronics, construction, aerospace and other industries for continuous and quantitative transportation of liquids of any viscosity.

[0041] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many variations are possible. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A liquid continuous quantitative delivery piston pump, characterized in that: The liquid continuous quantitative delivery piston pump comprises a pump body (1-2) having an upper end cover (1-3), a lower end cover (1-4) and a cylinder body, a piston rod (2) slidably positioned in the cylinder body, a reversing channel (4) connecting the upper end cover and the lower end cover, and a reversing component (3) installed in the lower end cover, the reversing component respectively connecting the reversing channel and the cylinder body, the upper end cover is provided with a discharge port, and the lower end cover is provided with a feed port; The cross-sectional area of ​​the piston rod is 1 / 2 of the area of ​​the inner hole of the cylinder body, and the volume of the annular space between the piston rod and the inner wall of the cylinder body is 1 / 2 of the volume of the cylinder body; The reversing assembly comprises two left and right reversing ball valves (3-1) installed in the cavity of the lower end cover and connected to each other; the left end outlet of the left reversing ball valve is closed by a clamping nut (3-2), the circumferential surface outlet is connected to the reversing channel, and the right end inlet is connected to the left end outlet of the right reversing ball valve; the right end inlet of the right reversing ball valve is connected to the feed port, and the circumferential surface outlet is connected to the cylinder body.

2. The liquid continuous quantitative delivery piston pump according to claim 1, characterized in that: The upper end cover and the lower end cover are both provided with cavities communicated with the cylinder body, the discharge port is communicated with the cavity of the upper end cover, and the feed port is communicated with the cavity of the lower end cover.

3. The liquid continuous quantitative delivery piston pump according to claim 2, characterized in that: An upper flood plug unit slidably matched with the piston rod is installed at the cavity of the upper end cover; a lower flood plug unit slidably matched with the cylinder body is installed at the lower part of the piston rod.

4. The liquid continuous quantitative delivery piston pump according to claim 3, characterized in that: The upper flood-plug unit comprises an upper flood-plug fixing seat (2-2-1) with a cylindrical cavity coaxially arranged with the piston rod, an upper flood-plug fixing ring (2-2-2) and an upper flood-plug (2-2-3) which are sequentially sleeved with the piston rod in the axial direction of the piston rod, and an upper flood-plug pressing seat (2-2-4) which presses the upper flood-plug fixing ring and the upper flood-plug tightly into the cylindrical cavity of the upper flood-plug fixing seat.

5. The liquid continuous quantitative delivery piston pump according to claim 4, characterized in that: The lower pan-plug unit comprises a lower pan-plug fixing ring (2-3-2) and a lower pan-plug (2-3-3) which are sequentially sleeved on the lower part of the piston rod in the direction of the piston rod axis, and a lower pan-plug fixing seat (2-3-1) which fixes the lower pan-plug fixing ring and the lower pan-plug to the lower end of the piston rod.

6. The liquid continuous quantitative delivery piston pump according to claim 5, characterized in that: The reversing ball valve comprises a reversing sleeve (3-1-1) whose axis is arranged horizontally, a reversing ball positioning seat (3-1-2) located on the right end surface of the reversing sleeve, a positioning ball (3-1-3) movably positioned in the reversing sleeve, and a compression spring (3-1-4) for pushing the positioning ball toward the reversing ball positioning seat.

7. The liquid continuous quantitative delivery piston pump according to claim 6, characterized in that: The upper flood plug and the lower flood plug are both made of soft material.

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