Constant flow pump

Abstract

The invention provides a constant flow pump which comprises a pump body, and a water inlet cavity, a water outlet cavity and a compression cavity are formed in the pump body. The pump head is arranged on the pump body, a valve element cavity, an inner cavity, an outer cavity and a balance cavity are formed in the pump head, the inner cavity is communicated with the water outlet cavity, and the outer cavity is communicated with the water inlet cavity; a water inlet communicated with the first end of the valve element cavity and a water outlet communicated with the inner cavity are formed in the side wall of the pump head, and the balance cavity is communicated with the water inlet through a balance flow channel; the valve element cavity is communicated with the outer cavity, a valve element is arranged in the valve element cavity in a sliding fit mode, the two ends of the valve element are communicated with the balance cavity and the water inlet respectively, and pressure balance or pressure difference reduction can be achieved. And the elastic component enables the valve core to have a movement trend of blocking the communication between the water inlet and the outer cavity. The constant flow pump is simple and compact in structure, small in size, reasonable in layout, convenient to machine and assemble, capable of achieving constant flow output, good in operation stability, high in reliability and wide in use scene.

Description

Technical Field

[0001] This invention relates to a pump, and more particularly to a constant flow pump. Background Technology

[0002] In modern industrial and residential environments, heating systems are widely used in various fields, such as water treatment, chemical reactions, and food processing. The precision and stability of these systems are crucial for ensuring the quality of the production process. Constant flow pumps, as a key component in these heating systems, primarily provide a stable liquid flow. Specifically, a constant flow pump maintains the outlet flow rate within a set range, unaffected by factors such as pipe resistance or changes in inlet water pressure. In devices like water purifiers, constant flow pumps play an even more important role, ensuring a stable water supply and enabling more precise temperature control at the outlet.

[0003] However, in practical applications, the operating status of the constant flow pump directly affects the accuracy of the heating temperature. This is because changes in the flow rate of the constant flow pump lead to instability in the water flow entering the heating system, further causing fluctuations in the heating temperature, resulting in decreased heating efficiency and affecting the quality of the final product. Specifically, if the flow rate of the constant flow pump is unstable, even if the heating system itself is designed reasonably, it will be difficult to achieve the expected heating effect, and overheating or underheating may even occur.

[0004] Therefore, the stability of the constant flow pump's flow rate is a key factor directly affecting the temperature control accuracy of the heating system. Existing constant flow pumps have design limitations; either their structure is too complex, resulting in high manufacturing and maintenance costs, or their structure limits flow control accuracy, making it difficult to meet stable output requirements under demanding operating conditions. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a constant flow pump with a compact structure, low manufacturing and operating costs, and high flow control accuracy.

[0006] This invention provides a constant flow pump, comprising: Pump body 6, wherein the pump body 6 is provided with an inlet chamber 60b, an outlet chamber 60a and a compression chamber 601; A pump head is mounted on the pump body 6. The pump head contains a valve core cavity 10, an inner cavity 104, an outer cavity 103, and a balance cavity 107. The inner cavity 104 is connected to the outlet cavity 60a, and the outer cavity 103 is connected to the inlet cavity 60b. The side wall of the pump head has an inlet 101 connected to the first end of the valve core cavity 10 and an outlet 102 connected to the inner cavity 104. The balance cavity 107 is connected to the inlet 101 through a balance flow channel 106. The valve core cavity 10 is connected to the outer cavity 103. A valve core 4 is slidably mounted inside the valve core cavity 10. The two ends of the valve core 4 are connected to the balance cavity 107 and the inlet 101, respectively, and can achieve pressure balance or reduce pressure difference. The elastic component 5 causes the valve core 4 to have a tendency to block the communication between the water inlet 101 and the outer cavity 103; When the compression chamber 601 works continuously and generates negative pressure in the outer chamber 103, the valve core 4 can slide and connect the water inlet port 101 with the outer chamber 103 to achieve water intake.

[0007] When the pressure at the inlet 101 and the outer cavity 103 is balanced, or the pressure difference is less than the force of the elastic component, the valve core 4 slides in the opposite direction under the action of the elastic component 5 and blocks the connection between the inlet 101 and the outer cavity 103.

[0008] Furthermore, the second end of the valve core cavity 10 is open and connected to the outer cavity 103, and one end of the valve core 4 extends into the balance cavity 107 after passing through the outer cavity 103.

[0009] Furthermore, the side wall of the valve core 4 is provided with an annular protrusion to form a spring support portion 42. The elastic component 5 is a spring and is sleeved on the valve core 4. One end of the elastic component 5 contacts the end face of the outer cavity 103, and the other end contacts the spring support portion 42.

[0010] Furthermore, the side wall of the inlet end of the valve core 4 is provided with a first drainage groove 430 communicating with the valve core cavity 10 and / or the side wall of the outlet end of the valve core cavity 10 is provided with a second drainage groove 120 communicating with the outer cavity 103, and a first sealing ring is provided between the first drainage groove 430 and the second drainage groove 120.

[0011] Furthermore, the first diversion channel 430 and the second diversion channel 120 are located on the same axial plane, and when the valve core 4 moves towards the outer cavity, the first diversion channel 430 can communicate with the second diversion channel 120 and realize water discharge.

[0012] Furthermore, the first drainage channel 430 and the second drainage channel 120 are multiple sets and are evenly distributed circumferentially.

[0013] Furthermore, the inner wall of the first diversion channel 430 in the water outlet direction is a sloped or arc-shaped surface.

[0014] Furthermore, the valve core 4 is provided with a limiting hole 410 at its end, and the balance cavity 107 is provided with a limiting post 21 that can be inserted into the limiting hole 410 and restrict the rotation of the valve core 4, thereby making the first drainage groove 430 on the side wall of the valve core 4 and the second drainage groove 120 on the valve core cavity 10 located on the same axial plane.

[0015] Furthermore, the second drainage groove 120 includes a first groove 1201 disposed on the inner wall of the valve core cavity 10 and a second groove 1202 disposed at the end of the valve core cavity and communicating with the first groove 1201.

[0016] Furthermore, the valve core 4 includes a first cylindrical body 41 and a second cylindrical body 43. An annular protrusion is provided between the first cylindrical body 41 and the second cylindrical body 43 to form a spring support portion 42. A limiting hole 410 with a non-circular cross-section is provided at the top of the first cylindrical body 41. A sealing ring mounting groove 431 is provided on the sidewalls of both the first cylindrical body 41 and the second cylindrical body 43.

[0017] Furthermore, the outer cavity 103 includes an upper cavity and a lower cavity that are interconnected. The valve core cavity 10, the inner cavity 104, and the lower cavity are arranged sequentially from the inside to the outside. The upper cavity is located at the upper end and outside of the valve core cavity 10, and the balance cavity is located above the upper cavity.

[0018] Furthermore, the pump head is provided with an inner cylinder 12 and an outer cylinder 14. The upper end of the inner cylinder 12 is open and the lower end is sealed to form the valve core cavity 10. The upper end of the outer cylinder 14 is sealed and the lower end is open. The outer side of the outer cylinder 14 forms an inlet area 141 for docking with the inlet cavity 60b, and the inner side of the outer cylinder 14 forms an outlet area 142 for docking with the outlet cavity 60a. The outer wall of the outer cylinder 14 is connected to the inner wall of the pump head through a connecting bracket 112, and the outer cavity 103 is formed above the connecting bracket. The side wall of the pump head is provided with an inlet pipe connected to the inner cylinder 12 and an outlet pipe connected to the outer cylinder 14.

[0019] Furthermore, the upper end of the outer cavity 103 is open and sealed with an end cap 2. A partition 3 is provided inside the outer cavity 103, and the partition 3 and the end cap 2 form the balance cavity 107. A first connecting pipe 34 is provided on the partition 3, and a first hole 340 communicating with the upper surface of the partition is formed inside the first connecting pipe 34. A second connecting pipe 13 is provided on the water inlet pipe, and a second hole 130 communicating with the water inlet is formed inside the second connecting pipe 13. The second connecting pipe 13 is connected to the first connecting pipe 34 to form the balance flow channel.

[0020] Furthermore, the sidewall of the outer cavity 103 is provided with a plurality of support columns 111, the top surface of the support columns 111 forming a support surface for supporting the partition 3; the upper end of the partition 3 contacts the end cover 2 and achieves axial positioning.

[0021] Furthermore, the partition 3 includes a partition body 31 with the same cross-sectional shape as the outer cavity. The edge of the partition body 31 extends axially downward to form a mounting portion 32. A sealing ring is provided on the side wall of the mounting portion 32. A groove 310 is provided on the top surface of the partition body 31. The groove 310 and the end cap 2 form the balance cavity 107. A central hole 311 is passed through the center of the groove 310. The edge of the central hole 311 extends axially downward to form a valve sleeve 33. One end of the valve core is slidably fitted in the valve sleeve 33. A spring seat for installing an elastic component is formed on the outer side of the valve sleeve 33.

[0022] Furthermore, the side wall of the mounting part 32 is provided with a second sealing ring 321 that can contact the inner wall of the end cover 2 and a third sealing ring 322 that can contact the inner wall of the outer cavity. Furthermore, the inlet cross-sectional area of ​​the balanced flow channel is smaller than the inlet cross-sectional area of ​​the first end of the valve core.

[0023] This invention relates to a constant flow pump. When the compression chamber continuously operates and generates negative pressure in the outer chamber, the valve core slides against the preload of the elastic component, opening the water inlet channel to ensure continuous fluid supply. When the pressure at the inlet and the outer chamber is balanced or the pressure difference is insufficient, the valve core resets under the action of the elastic component, blocking water inflow and preventing overflow. Through this cycle of negative pressure drive and pressure balance reset, the flow rate is always maintained at a stable value corresponding to the preload of the elastic component, effectively avoiding the fluctuating or intermittent flow caused by pressure fluctuations in traditional pumps.

[0024] The balancing chamber is connected to the inlet via a flow channel, maintaining a dynamic pressure balance across the valve core. This prevents malfunctions caused by sudden changes in inlet pressure, such as unstable water supply. Even with fluctuations in inlet pressure, the valve core can accurately respond to the negative pressure signal from the compression chamber, ensuring consistent effective flow rate each time water enters the valve, thus eliminating flow fluctuations at the source.

[0025] By adjusting the preload of the elastic component, it can adapt to different working pressure ranges. The sliding design of the valve core in the valve core cavity, combined with the pressure balance of the balance chamber, reduces sliding resistance and improves the sensitivity of action. It can still maintain the consistency of flow output in complex or unstable water supply environments, and is applicable to a wide range of scenarios.

[0026] The constant flow pump of this invention has a simple and compact structure, small size, reasonable layout, is easy to process and assemble, can achieve constant flow output, and has good operational stability, high reliability, and wide application scenarios. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the constant flow pump of the present invention; Figure 2 This is a schematic diagram of the constant flow pump of the present invention from another angle; Figure 3 This is a cross-sectional view of the constant flow pump of the present invention; Figure 4 This is an exploded structural diagram of the constant flow pump of the present invention; Figure 5 This is a schematic diagram of the internal structure of the constant flow pump of the present invention; Figure 6 This is a cross-sectional view of the pump head of the constant flow pump of the present invention; Figure 7 for Figure 6 Enlarged view of section A in the middle; Figure 8 This is an exploded structural diagram of the pump head of the constant flow pump of the present invention; Figure 9 This is a schematic diagram of the pump casing of the constant flow pump of the present invention; Figure 10 This is a cross-sectional view of the pump housing of the constant flow pump of the present invention; Figure 11 This is a cross-sectional view of the pump casing of the constant flow pump of the present invention. Figure 12 This is a schematic diagram of the structure of the diaphragm of the constant flow pump of the present invention; Figure 13 This is a schematic diagram of the diaphragm structure of the constant flow pump of the present invention from another angle; Figure 14 This is a cross-sectional view of the baffle plate of the constant flow pump of the present invention; Figure 15 This is a schematic diagram of the valve core of the constant flow pump of the present invention; Figure 16 This is a schematic diagram of the valve core of the constant flow pump of the present invention from another angle; Figure 17 This is a cross-sectional view of the valve core of the constant flow pump of the present invention; Figure 18 for Figure 8 Enlarged view of section B in the middle; Figure 19 This is a schematic diagram of the pump body of the constant flow pump of the present invention; Figure 20 This is a cross-sectional view of the pump body of the constant flow pump of the present invention.

[0028] In the diagram: 1. Pump casing, 2. End cover, 3. Baffle plate, 4. Valve core, 5. Elastic component, 6. Pump body, 10. Valve core cavity, 12. Inner cylinder, 13. Second connecting pipe, 14. Outer cylinder, 21. Limiting post, 31. Baffle plate body, 32. Mounting part, 33. Valve sleeve, 34. First connecting pipe, 41. First cylindrical body, 42. Spring support part, 43. Second cylindrical body, 61. First check valve, 62. Second check valve, 64. Elastic diaphragm, 101. Inlet, 102. Outlet, 103. Outer cavity, 104. Inner cavity, 106. Balance Flow channel, 107, balance chamber, 111, support column, 112, connecting bracket, 120, second diversion groove, 1201, first groove, 1202, second groove, 130, second hole, 141, water inlet area, 142, water outlet area, 310, groove, 311, center hole, 321, second sealing ring, 322, third sealing ring, 340, first hole, 410, limiting hole, 430, first diversion groove, 431, sealing ring mounting groove, 434, first sealing ring, 601, compression chamber, 60a, water outlet chamber, 60b, water inlet chamber. Detailed Implementation

[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] See Figures 1-20 The present invention provides a constant flow pump, which includes a pump body 6 and a pump head.

[0031] The pump body 6 is connected to a motor as the power source. The pump body 6 has an inlet chamber 60b, an outlet chamber 60a, and a compression chamber 601. The compression chamber 601 contains an elastic membrane 64, which can undergo elastic deformation to increase or decrease the chamber volume. The inlet chamber 60b is connected to the compression chamber 601 via an inlet channel, and the outlet chamber 60a is connected to the compression chamber 601 via an outlet channel. A first one-way valve 61 is provided on the inlet channel, which allows the fluid in the inlet chamber 60b to flow in one direction only. The fluid flows into the compression chamber 601; a second one-way valve 62 is provided on the outlet channel, which allows the fluid in the compression chamber 601 to flow unidirectionally into the outlet chamber 60a; when the elastic diaphragm 64 moves away from the pump body, a negative pressure is formed in the compression chamber 601, and the fluid in the inlet chamber 60b enters the compression chamber 601 through the first one-way valve 61; when the elastic diaphragm 64 moves closer to the pump body, the pressure in the compression chamber 601 increases, and the fluid is discharged into the outlet chamber 60a and output through the second one-way valve 62.

[0032] A pump head is mounted on the pump body 6. Inside the pump head are a valve core cavity 10, an inner cavity 104, an outer cavity 103, and a balancing cavity 107. The inner cavity 104 connects to the outlet cavity 60a, and the outer cavity 103 connects to the inlet cavity 60b. The side wall of the pump head has an inlet 101 and an outlet 102. The inlet 101 connects to the first end of the valve core cavity 10, and the outlet 102 connects to the inner cavity 104. Simultaneously, the balancing cavity 107 connects to the inlet 101 via a balancing flow channel 106. The valve core cavity 10 connects to the outer cavity 103, and a valve core 4 is slidably mounted within the valve core cavity 10. This valve core 4 can slide within the valve core cavity 10, enabling on / off control of the inlet 101 and the outer cavity 103. In this embodiment, the two ends of the valve core 4 are connected to the balancing cavity 107 and the inlet 101, respectively, thereby balancing the pressure (water pressure) at both ends of the valve core 4 or reducing the pressure difference.

[0033] Meanwhile, an elastic component 5 is provided inside the pump body 6. This elastic component 5 is a compression spring, which causes the valve core 4 to tend to move closer to the water inlet 101, that is, to tend to block the water inlet 101 from communicating with the outer cavity 103.

[0034] When the compression chamber 601 operates continuously, it generates negative pressure in the outer chamber 103, causing the valve core 4 to move towards the lower pressure direction. This connects the valve core cavity 10 with the outer chamber 103, thus connecting the inlet 101 with the outer chamber 103. Fluid enters the outer chamber 103 from the inlet 101 through the valve core cavity 10, achieving water intake. Specifically, since the compression chamber is a unidirectional moving cavity, the negative pressure generated by a single movement or an increase in volume is insufficient to lift the valve core. However, the continuous operation of the compression chamber, coupled with a unidirectional exhaust process, generates a larger negative pressure, thereby pulling the valve core upward.

[0035] When the pressure of the inlet 101 and the outer cavity 103 is balanced, or the pressure difference is less than the force of the elastic component, the valve core 4 slides in the opposite direction under the action of the elastic component 5, thereby blocking the connection between the inlet 101 and the outer cavity 103.

[0036] When the compression chamber 601 contracts, its internal pressure increases, which in turn opens the second one-way valve 62, allowing the fluid to be discharged from the compression chamber 601 into the outlet chamber 60a, and then output through the outlet 102 via the inner cavity 104, thus realizing water discharge.

[0037] This application incorporates a valve core and an elastic component within the pump head, forming an automatic adjustment mechanism. When the compression chamber operates continuously, causing a negative pressure of 103 in the outer chamber, the valve core overcomes the preload of the elastic component and slides, opening the water inlet channel. When the pressure at the inlet and the outer chamber is balanced or the pressure difference is insufficient, the valve core resets under the action of the elastic component, blocking the water inlet. This achieves constant water flow output, effectively preventing water flow interruptions or backflow caused by pressure fluctuations. Simultaneously, this application includes a balance chamber and a balance flow channel within the pump head. The balance chamber connects to the inlet via the balance flow channel, preventing valve core malfunctions caused by inlet pressure fluctuations and reducing the driving force required for valve core sliding, thus improving the sensitivity and reliability of valve core operation. By adjusting the preload of the elastic component, it can adapt to different working pressure ranges, enabling stable operation in complex or unstable water supply environments, thus having a wide range of applications. Furthermore, the above structure improves the smoothness of valve core sliding, preventing vibrations caused by sudden changes in force.

[0038] In this embodiment, the second end of the valve core cavity 10 is open and connects to the outer cavity 103. One end of the valve core 4 passes through the outer cavity 103 and extends into the balance cavity 107. The structure is compact, the layout is reasonable, and it is easy to process and assemble as a whole.

[0039] In this embodiment, the valve core cavity 10, inner cavity 104, and outer cavity 103 are coaxially arranged. The outer cavity 103 includes an upper cavity and a lower cavity that are interconnected and arranged vertically. The valve core cavity 10, inner cavity 104, and lower cavity are arranged sequentially from the inside to the outside. The upper cavity is located at the upper end and outside of the valve core cavity 10, and the balance cavity is located above the upper cavity. Its layout is reasonable, which facilitates overall processing and assembly and effectively improves the integration and sealing reliability of the pump head.

[0040] Specifically, the pump head includes a pump housing 1, which includes a cylindrical pump housing body 11. Inside the pump housing 1, there is an inner cylinder 12 and an outer cylinder 14. Preferably, the two are coaxial. The upper end of the inner cylinder 12 is open and the lower end is closed to form a valve core cavity 10. The upper end of the outer cylinder 14 is closed and the lower end is open. In this embodiment, the upper end of the outer cylinder extends radially inward and connects to the side wall of the inner cylinder 12 to form an upper air vent structure. A water inlet area 141 is formed on the outer side of the outer cylinder 14. The lower end of the water inlet area 141 is open and is used to dock with the water inlet cavity 60b. A water outlet area 142 is formed on the inner side of the outer cylinder 14. The lower end of the water outlet area 142 is open and is used to dock with the water outlet cavity 60a.

[0041] The outer wall of the outer cylinder 14 is connected to the inner wall of the pump head through the connecting bracket 112 to form an integral structure. The connecting bracket 112 has a connecting hole, which connects the outer cavity 103 and the water inlet area (water inlet chamber). The outer cavity 103 is formed above the connecting bracket. The side wall of the pump head is provided with a water inlet pipe and a water outlet pipe. The water inlet pipe is connected to the inner cylinder 12 and has a hollow structure, which forms a water inlet. The water outlet pipe is connected to the outer cylinder 14 and has a hollow structure, which forms a water outlet. In this embodiment, the water inlet pipe and the water outlet pipe are coaxially arranged, and their axes are perpendicular to and intersect the axis of the inner cylinder.

[0042] The upper end of the outer cavity 103 is open and an end cap 2 is installed and sealed with bolts. A partition 3 is provided inside the outer cavity 103, and a balance cavity 107 is formed between the partition 3 and the end cap 2. The axial height of the balance cavity 107 is small. A first connecting pipe 34 is provided on the partition 3. In this embodiment, the axis of the first connecting pipe 34 is parallel to the axis of the inner cylinder. A first hole 340 communicating with the upper surface of the partition is formed inside the first connecting pipe 34. At the same time, a second connecting pipe 13 is provided on the water inlet pipe. The second connecting pipe 13 is coaxial with the first connecting pipe. A second hole 130 communicating with the water inlet (water inlet pipe) is formed inside the second connecting pipe 13. The second connecting pipe 13 and the first connecting pipe 34 are connected to form a balance flow channel.

[0043] Multiple support columns 111 are provided on the side wall of the outer cavity 103. In this embodiment, the multiple support columns 111 are evenly distributed around the circumference, and their lower ends are provided with screw holes for fixed connection with the pump body. The top surface of the support column 111 forms a support surface for supporting the support surface of the partition 3. The upper end of the partition 3 contacts the end cover 2, thereby realizing the axial positioning of the partition 3.

[0044] In this embodiment, the partition 3 includes a partition body 31 with the same cross-sectional shape as the outer cavity and the end cap. The edge of the partition body 31 extends axially downward to form a mounting portion 32. A sealing ring is provided on the side wall of the mounting portion 32. Specifically, a second sealing ring 321 that can contact the inner wall of the end cap 2 and a third sealing ring 322 that can contact the inner wall of the outer cavity are provided on the side wall of the mounting portion 32. A groove 310 is provided on the top surface of the partition body 31. A balance cavity 107 is formed between the groove 310 and the end cap 2. A central hole 311 is passed through the center of the groove 310. The edge of the central hole 311 extends axially downward to form a valve sleeve 33. One end of the valve core is slidably fitted in the valve sleeve 33. At the same time, a spring seat is formed on the outer side of the valve sleeve 33 for mounting elastic components.

[0045] During assembly, the baffle in this application resembles a piston structure, fitting inside the outer cavity. The distance between the supporting surface and the bottom surface of the end cover is slightly greater than the thickness of the baffle (including the mounting portion), allowing the baffle to undergo a small displacement in the axial direction. This displacement is used to compensate for axial force changes caused by pressure fluctuations during pump operation, ensuring dynamic stability of the liquid pressure in the balance chamber. That is, when the outer cavity is subjected to negative pressure, the valve core moves upward, reducing the volume in the balance chamber. Simultaneously, under the action of negative pressure, the baffle moves downward slightly, achieving volume compensation in the balance chamber and thus maintaining relative stability of the pressure in the balance chamber.

[0046] An annular protrusion is provided on the side wall of the valve core 4, thereby forming a spring support part 42. The elastic component 5 is a spring, which is sleeved on the outside of the valve core 4. One end of the elastic component 5 contacts the end face of the outer cavity 103, and the other end contacts the spring support part 42; thereby realizing the elastic installation of the valve core 4 in the pump head.

[0047] To improve the smoothness of valve core movement and the stability of water output, in this embodiment, a first drainage groove 430 is provided on the side wall of the water inlet end of the valve core 4. The first drainage groove 430 connects to the first end of the valve core cavity 10 and the water inlet. A second drainage groove 120 is provided on the side wall of the water outlet end of the valve core cavity 10. The second drainage groove 120 connects to the outer cavity 103. A first sealing ring 434 is provided between the first drainage groove 430 and the second drainage groove 120. When the valve core moves axially, the first drainage groove and the second drainage groove are connected or completely separated, realizing the connection or blockage between the water inlet and the outer cavity 103. During this process, the valve core is still slidably fitted in the valve core cavity to ensure guiding accuracy and operational reliability.

[0048] Preferably, there are multiple sets of first drainage channels 430 and second drainage channels 120, evenly distributed circumferentially; each set includes a first drainage channel 430 and a second drainage channel 120 located on the same axial plane; when the valve core 4 moves towards the outer cavity, the first drainage channel 430 can connect with the second drainage channel 120 to achieve water discharge; through the above structural arrangement, the movement stroke of the valve core can be reduced, and the connection response speed can be improved; at the same time, the connection area during connection is increased, thereby improving the water intake efficiency and ensuring the continuity and stability of water output. The synergistic effect of multiple sets of drainage channels can effectively reduce fluid resistance and improve dynamic response performance. Specifically, a limiting hole 410 is provided at the end of the valve core 4. This limiting hole is non-circular, such as a rectangular or polygonal hole. Simultaneously, a limiting post 21, which can be inserted into the limiting hole 410, is provided in the balance chamber 107. This limiting post restricts the rotation of the valve core 4, thereby ensuring that the first drainage groove 430 on the side wall of the valve core 4 and the second drainage groove 120 on the valve core cavity 10 are located on the same axial plane, preventing radial misalignment and improving operational reliability and stability. To prevent the limiting hole 410 and the side wall of the limiting post 21 from being too close together, creating a sealed chamber between their ends and generating internal pressure, in this embodiment, one or more connecting grooves are provided on the side wall of the limiting hole. The end of the connecting groove extends to the upper end of the valve core, meaning that the limiting hole 410 is directly connected to the balance chamber 107 through the connecting groove. When the valve core moves, water between the limiting hole of the valve core and the end of the limiting post on the end cap 2 can be drained through the connecting groove, preventing internal pressure and ensuring stable and reliable operation of the valve core.

[0049] In this embodiment, the inner wall of the first diversion channel 430 in the water outlet direction is a sloped or arc-shaped surface, which has a guiding effect and can effectively guide the water flow into the outer cavity, reducing turbulence and pressure loss.

[0050] In this embodiment, the second drainage groove 120 includes a first groove 1201 disposed on the inner wall of the valve core cavity 10 and a second groove 1202 disposed at the end of the valve core cavity. The second groove 1202 communicates with the first groove 1201. Through the above arrangement, the annular protrusion on the side wall of the valve core can be prevented from fitting with the end of the valve core cavity and affecting the communication between the second drainage groove and the outer cavity, thus ensuring unobstructed flow.

[0051] The valve core 4 includes a coaxial first cylindrical body 41 and a second cylindrical body 43. An annular protrusion is provided between the first cylindrical body 41 and the second cylindrical body 43, forming a spring support part 42. A limiting hole 410 is opened at the top of the first cylindrical body 41. At the same time, a sealing ring mounting groove 431 is opened on the side wall of both the first cylindrical body 41 and the second cylindrical body 43 for installing the sealing ring. In this embodiment, the sealing ring at the lower end is the first sealing ring 434, which is used to block the communication between the water inlet and the outer cavity, and the sealing ring at the upper end is used to block the communication between the outer cavity and the balance cavity.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A constant flow pump, characterized in that, include: The pump body is provided with an inlet chamber, an outlet chamber and a compression chamber; A pump head is disposed on the pump body. The pump head has a valve core cavity, an inner cavity, an outer cavity, and a balance cavity. The inner cavity is connected to the outlet cavity, and the outer cavity is connected to the inlet cavity. The side wall of the pump head has an inlet connected to the first end of the valve core cavity and an outlet connected to the inner cavity. The balance cavity is connected to the inlet through a balance flow channel. The valve core cavity is connected to the outer cavity, and a valve core is slidably mounted in the valve core cavity. The two ends of the valve core are respectively connected to the balance cavity and the inlet. The elastic component gives the valve core a tendency to block the connection between the inlet and the outer cavity.

2. The constant flow pump as described in claim 1, characterized in that: The second end of the valve core cavity is open and communicates with the outer cavity, and one end of the valve core passes through the outer cavity and extends into the balance cavity.

3. The constant flow pump as described in claim 1, characterized in that: The valve core has a first drainage groove on the side wall of the inlet end that connects to the valve core cavity and / or a second drainage groove on the side wall of the outlet end that connects to the outer cavity. A first sealing ring is provided between the first drainage groove and the second drainage groove.

4. The constant flow pump as described in claim 3, characterized in that: The first and second drainage channels are located on the same axial plane, and when the valve core moves towards the outer cavity, the first drainage channel can communicate with the second drainage channel and achieve water discharge.

5. The constant flow pump as described in claim 3, characterized in that: The valve core is provided with a limiting hole at its end, and the balance cavity is provided with a limiting post that can be inserted into the limiting hole and restrict the rotation of the valve core, thereby making the first drainage groove on the side wall of the valve core and the second drainage groove on the valve core cavity located on the same axial plane.

6. The constant flow pump as described in claim 3, characterized in that: The second drainage groove includes a first groove disposed on the inner wall of the valve core cavity and a second groove disposed at the end of the valve core cavity and communicating with the first groove.

7. The constant flow pump as described in claim 1, characterized in that: The pump head is provided with an inner cylinder and an outer cylinder. The upper end of the inner cylinder is open and the lower end is sealed to form the valve core cavity. The upper end of the outer cylinder is sealed and the lower end is open. The outer side of the outer cylinder forms an inlet area for docking with the inlet cavity, and the inner side of the outer cylinder forms an outlet area for docking with the outlet cavity. The outer wall of the outer cylinder is connected to the inner wall of the pump head through a connecting bracket, and the outer cavity is formed above the connecting bracket. The side wall of the pump head is provided with an inlet pipe connected to the inner cylinder and an outlet pipe connected to the outer cylinder.

8. The constant flow pump as described in claim 1, characterized in that: The upper end of the outer cavity is open and sealed with an end cap. A partition is provided inside the outer cavity, and the partition and the end cap form the balance cavity. A first connecting pipe is provided on the partition, and a first hole is formed inside the first connecting pipe that communicates with the upper surface of the partition. A second connecting pipe is provided on the water inlet pipe, and a second hole is formed inside the second connecting pipe that communicates with the water inlet. The second connecting pipe is connected to the first connecting pipe to form the balance flow channel.

9. The constant flow pump as described in claim 8, characterized in that: The partition includes a partition body with the same cross-sectional shape as the outer cavity. The edge of the partition body extends axially downward to form a mounting portion, and a sealing ring is provided on the side wall of the mounting portion. The top surface of the partition body is provided with a groove, and the groove and the end cap form the balance cavity. A central hole is passed through the center of the groove, and the edge of the central hole extends axially downward to form a valve sleeve. One end of the valve core is slidably fitted into the valve sleeve, and a spring seat for installing an elastic component is formed on the outer side of the valve sleeve.

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