High-pressure plunger pump capable of resisting attenuation of pump hydraulic pressure

Abstract

The high-pressure plunger pump comprises a water inlet and outlet cover, a compression bin, a base, a motor and a plunger assembly, a water inlet pipe is formed on the outer wall of the water inlet and outlet cover, a liquid inlet flow channel is formed in the water inlet pipe, the water inlet and outlet cover and the compression bin and opened and closed through a liquid inlet one-way valve, and a water drainage pipe is formed in the outer wall of the compression bin. A liquid drainage flow channel is formed in the water drainage pipe and the compression bin, the liquid drainage flow channel is opened and closed by a liquid drainage one-way valve, the liquid drainage flow channel comprises an inner liquid drainage flow channel, a liquid drainage flow guide hole and an outer liquid drainage flow channel, and the inner liquid drainage flow channel is located on the side, away from the piston cavity, of the compression bin and communicates with the piston cavity through the liquid drainage flow guide hole; the liquid drainage flow guide hole is opened or closed by a liquid drainage one-way valve, and the outer liquid drainage flow channel is located in the water drainage pipe and is opposite to and communicated with the inner liquid drainage flow channel. According to the technical scheme, when the high-pressure plunger pump pumps liquid, the liquid flowing path is short, the flowing path is free of corners, and then liquid pressure attenuation during liquid pumping is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, and more specifically to a high-pressure plunger pump with pump liquid pressure attenuation resistance. Background Art

[0002] The plunger pump is a positive displacement pump that uses the reciprocating motion of the plunger in the pump cylinder to achieve the suction and discharge of liquid. The working principle of the plunger pump is based on the linear motion of the piston or plunger in the pump cylinder. This motion changes the volume of the pump chamber, thereby generating a pressure difference to drive the liquid flow. Therefore, the plunger pump can generate very high pressure and is suitable for occasions that require high-pressure liquid delivery. It also has the characteristics of being able to accurately control the flow of the pump by adjusting the stroke or speed of the plunger, as well as being compact in structure and occupying little space.

[0003] The patent with publication number CN219344891U and name “A high-pressure pump for conveying high-temperature liquid medium” discloses a plunger pump, which mainly includes a motor and a pump body. The pump body is provided with an inlet channel and a discharge channel, and the inlet channel and the discharge channel are respectively provided with an inlet check valve and a discharge check valve. A piston cavity is provided in the pump body, and the inlet channel and the discharge channel are connected with the piston cavity. A pump plunger assembly is provided in the piston cavity, one end of the pump plunger assembly is eccentrically connected to the output end of the motor, and the other end passes through the piston cavity and is connected to the discharge check valve. More specifically, the pump body includes a water inlet and outlet cover, a compression chamber and a base which are arranged in sequence and detachably connected, the inlet channel and the discharge channel are located in the water inlet and outlet cover and the compression chamber, and the piston cavity is located in the compression chamber and the base.

[0004] In the plunger pump of the above structure, the inlet channel and the discharge channel are distributed on the water inlet and outlet covers and the compression chamber of the pump body. An inlet pipe and an outlet pipe are also formed on the outer wall of the water inlet and outlet covers. The inner pipe sections of the inlet pipe and the outlet pipe also serve as part of the inlet channel and the discharge channel. Taking the discharge channel as an example, the part located in the outlet pipe is defined as the external discharge channel, and the part inside the inlet and outlet covers and the part inside the compression chamber are defined as the front side internal discharge channel and the rear side internal discharge channel, respectively. When pumping liquid, the discharge one-way valve is opened, and the liquid flows first through the rear side internal discharge channel of the compression chamber, then enters the front side discharge channel of the water inlet and outlet covers, and finally is pumped to the outside through the external discharge channel in the outlet pipe.

[0005] During actual use, it was found that products such as coffee machines equipped with the above-mentioned structural plunger pump had the problem of liquid pressure attenuation during the pumping process. The reason for this problem is that the liquid flow path is long and needs to pass through the compression chamber and the water inlet and outlet covers one by one. When the liquid enters the external liquid discharge channel from the front inner discharge channel, due to the existence of the corner between the front inner discharge channel and the external liquid discharge channel, its flow direction will change significantly, resulting in obvious liquid pressure attenuation, which causes a significant negative impact on the functional effects of products such as coffee machines that have strict requirements on the pumping effect. Utility Model Content

[0006] In view of the above situation, in order to overcome the problem that in the process of pumping liquid by the plunger pump in the above-mentioned prior art, the liquid flow path is long, and there is a corner between the front side inner discharge channel and the outer discharge channel of the discharge channel, which causes the liquid flow direction to change significantly and produces obvious liquid pressure attenuation, resulting in a significant negative impact on the pumping effect, the purpose of the utility model is to provide a high-pressure plunger pump with a short liquid flow path and no corners in the flow path during pumping liquid, thereby effectively reducing the liquid pressure attenuation during pumping liquid.

[0007] In order to achieve the above purpose, the technical solution of the utility model is:

[0008] A high-pressure plunger pump with anti-attenuation of pump liquid pressure, comprising an inlet and outlet water cover, a compression chamber and a base which are arranged in sequence from front to back, a motor is arranged on the outer wall of the base, a piston cavity is arranged in the base, a plunger assembly connected to the output end of the motor is arranged in the piston cavity, an inlet pipe is formed on the outer wall of the inlet and outlet water cover, the inlet pipe, the inlet and outlet water cover and the interior of the compression chamber form an inlet flow channel connected to the piston cavity, the inlet flow channel is opened and closed by an inlet one-way valve, a drain pipe is formed on the outer wall of the compression chamber, the drain pipe and the interior of the compression chamber form a discharge flow channel connected to the piston cavity, the discharge flow channel is opened and closed by a discharge one-way valve, the discharge flow channel comprises an inner discharge flow channel, a discharge guide hole and an outer discharge flow channel, the inner discharge flow channel is located on the side of the compression chamber away from the piston cavity, and is connected to the piston cavity through the discharge guide hole, the discharge guide hole is opened or closed by the discharge one-way valve, the outer discharge flow channel is located inside the drain pipe, and is opposite to and connected to the inner discharge flow channel.

[0009] Preferably, a first valve chamber and a second valve chamber are provided in the compression chamber, and the first valve chamber and the second valve chamber are respectively located on one side of the liquid inlet channel and the liquid discharge channel, and the liquid inlet check valve and the liquid discharge check valve are respectively movably provided in the first valve chamber and the second valve chamber, and open and close the liquid inlet channel and the liquid discharge channel respectively when moving.

[0010] Preferably, the liquid inlet channel includes an inner liquid inlet channel, a liquid inlet guide hole and an outer liquid inlet channel. The inner liquid inlet channel is located inside the water inlet and outlet cover, the liquid inlet guide hole is located in the compression chamber, and it connects the inner liquid inlet channel and the piston chamber, the liquid inlet guide hole is opened or closed by the liquid inlet one-way valve, and the outer liquid inlet channel is located inside the water inlet pipe and is connected to the inner liquid inlet channel.

[0011] Preferably, the plunger assembly includes a crankshaft, a ball bearing and an eccentric wheel, a matching groove is opened at one end of the crankshaft, the ball bearing is embedded in the matching groove, and the eccentric wheel has a base portion, the base portion is embedded in the inner ring of the ball bearing, and is eccentrically connected to the output end of the motor.

[0012] Preferably, the eccentric wheel further comprises a boss portion located on the outer wall of the base portion, and the boss portion abuts against the outer wall of the ball bearing.

[0013] Preferably, the plunger assembly further comprises a diaphragm, which is connected to the other end of the crankshaft and cooperates with a step between the diaphragm and the inner wall of the compression chamber.

[0014] Preferably, both the liquid inlet one-way valve and the liquid discharge one-way valve are umbrella valves.

[0015] Preferably, the water inlet and outlet covers, the compression chamber and the base are detachably fixed by threaded fasteners.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] (1) A drainage pipe is formed on the outer wall of the compression chamber of the high-pressure plunger pump of the utility model, and a drainage channel connected to the piston chamber is formed inside the drainage pipe and the compression chamber, thereby making the water inlet pipe of the drainage pipe closer to the piston chamber in space, thereby shortening the total length of the drainage channel and alleviating the attenuation of the hydraulic pressure during the pumping process.

[0018] (2) The discharge channel of the high-pressure plunger pump of the utility model is composed of three parts: an inner discharge channel, a discharge guide hole and an outer discharge channel. The inner discharge channel is located on the side of the compression chamber away from the piston chamber. The inner discharge channel is not directly connected to the piston chamber, but is connected to the piston chamber through the discharge guide hole. The discharge guide hole is opened or closed by a discharge one-way valve. The outer discharge channel is located inside the drain pipe. The outer discharge channel is also opposite to and connected to the inner discharge channel. The utility model cancels the no-corner design between the outer discharge channel and the inner discharge channel, thereby avoiding a significant change in the flow direction of the liquid when it passes through during the pumping process, achieving effective control of the liquid pressure attenuation, and significantly improving the pumping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the high-pressure plunger pump of the utility model;

[0020] Figure 2It is a schematic diagram of the exploded structure of the high-pressure plunger pump of the utility model;

[0021] Figure 3 This is a schematic diagram of the overall structure of the water inlet and outlet cover of the high-pressure plunger pump of the utility model;

[0022] Figure 4 This is a schematic diagram of the overall structure of the compression chamber of the high-pressure plunger pump of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the utility model high-pressure plunger pump when the water inlet and outlet covers and the compression chamber are separated from the base;

[0024] Figure 6 This utility model Figure 5 A schematic diagram of the enlarged structure of part A (the arrow is the flow direction of the liquid when pumping liquid);

[0025] Figure 7 This is a schematic diagram of the structure of the utility model high-pressure plunger pump when the water inlet and outlet covers are separated from the compression chamber;

[0026] Figure 8 This utility model Figure 7 Schematic diagram of the enlarged structure of part B (the arrow indicates the flow direction of the liquid when pumping liquid).

[0027] As shown in the figure:

[0028] 1. Water inlet and outlet covers; 101. Water inlet pipe; 101a. External liquid inlet channel; 102. Internal liquid inlet channel; 2. Compression chamber; 201. Drain pipe; 201a. External liquid discharge channel; 202. Internal liquid discharge channel; 203. Liquid discharge guide hole; 204. First valve chamber; 205. Second valve chamber; 206. Liquid inlet guide hole; 3. Base; 301. Piston chamber; 4. Motor; 5. Liquid inlet check valve; 6. Liquid discharge check valve; 7. Crankshaft; 701. Matching groove; 8. Ball bearing; 9. Eccentric wheel; 901. Base portion; 902. Boss portion; 10. Diaphragm; 11. Threaded fasteners. DETAILED DESCRIPTION

[0029] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of simplifying the description, and do not indicate or imply that the directions are specific directions that must be possessed and specific directions, structures, and operations, and therefore should not be understood as limitations on the present utility model.

[0031] like Figures 1 to 8 As shown, the utility model relates to a high-pressure plunger pump with anti-attenuation of pump liquid pressure. Consistent with conventional plunger pumps, it includes a water inlet and outlet cover 1, a compression chamber 2 and a base 3 arranged in sequence from front to back, a motor 4 is arranged on the outer wall of the base 3, a piston chamber 301 is arranged in the base 3, the output end of the motor 4 passes through the base 3 to the piston chamber 301, a plunger assembly connected to the output end of the motor 4 is arranged in the piston chamber 301, the plunger assembly is driven by the motor 4 to change the effective volume of the piston chamber 301, a water inlet pipe 101 for liquid to enter is formed on the outer wall of the water inlet and outlet cover 1, and the water inlet pipe 101, the water inlet and outlet cover 1 and the interior of the compression chamber 2 are connected to the piston chamber 301 The liquid inlet flow channel is opened and closed by a liquid inlet one-way valve 5. When the effective volume of the piston chamber 301 is expanded, negative pressure is formed to make the liquid inlet one-way valve 5 move toward the piston chamber 301 to open the liquid inlet flow channel to complete the liquid inlet activity. The liquid enters the piston chamber 301 through the liquid inlet flow channel. In particular, a drain pipe 201 is formed on the outer wall of the compression chamber 2. The drain pipe 201 and the interior of the compression chamber 2 form a liquid discharge flow channel connected to the piston chamber 301, thereby making the drain pipe 201 and the water inlet pipe 101 closer to the piston chamber 301 in space, so as to shorten the total length of the liquid discharge flow channel and alleviate the attenuation of the hydraulic pressure during the pumping process. The liquid discharge flow channel is opened and closed by a liquid discharge one-way valve 6. Open and close. When the effective volume of the piston chamber 301 is compressed, the pressure in the chamber increases, pushing the discharge one-way valve 6 to move away from the piston chamber 301 to open the discharge channel, and allowing the liquid to be pumped to the outside through the discharge channel. The discharge channel consists of three parts: the inner discharge channel 202, the discharge guide hole 203 and the outer discharge channel 201a. The inner discharge channel 202 is located on the side of the compression chamber 2 away from the piston chamber 301. The inner discharge channel 202 is not directly connected to the piston chamber 301, and is connected to the piston chamber 301 through the discharge guide hole 203. The discharge guide hole 203 is opened or closed by the discharge one-way valve 6, and the outer discharge channel 201a is located inside the drain pipe 201. , the outer liquid discharge channel 201a is also opposite to and connected with the inner liquid discharge channel 202. The utility model cancels the design of no corner between the outer liquid discharge channel 201a and the inner liquid discharge channel 202. When pumping liquid, when the discharge check valve 6 is pushed by the pressure in the piston chamber 301, the discharge guide hole 203 of the discharge channel is opened, so that the inner liquid discharge channel 202 is connected with the piston chamber 301. After the liquid overflows into the inner liquid discharge channel 202 through the discharge guide hole 203, it can be directly discharged from the drain pipe 201 through the outer liquid discharge channel 201a, thereby avoiding a large change in the flow direction of the liquid when passing through during the pumping process, achieving effective control of the liquid pressure attenuation, and significantly improving the pumping effect.

[0032] like Figure 4As shown, a first valve chamber 204 and a second valve chamber 205 are provided in the compression chamber 2, and the first valve chamber 204 and the second valve chamber 205 are respectively located on one side of the liquid inlet flow channel and the liquid discharge flow channel, and the liquid inlet check valve 5 and the liquid discharge check valve 6 are respectively movably provided in the first valve chamber 204 and the second valve chamber 205, and respectively open and close the liquid inlet flow channel and the liquid discharge flow channel when they are moved. The high-pressure plunger pump of the utility model respectively inlets and pumps liquid when the liquid inlet check valve 5 and the liquid discharge check valve 6 are moved to open the liquid inlet flow channel and the liquid discharge flow channel, and correspondingly, pumps liquid and inlets liquid when the liquid inlet check valve 5 and the liquid discharge check valve 6 are moved to close the liquid inlet flow channel and the liquid discharge flow channel.

[0033] like Figures 1 to 4 As shown, the liquid inlet flow channel includes an inner liquid inlet flow channel 102, a liquid inlet guide hole 206 and an outer liquid inlet flow channel 101a. The inner liquid inlet flow channel 102 is located inside the water inlet and outlet cover 1, and the liquid inlet guide hole 206 is located in the compression chamber 2. The liquid inlet guide hole 206 is parallel to the discharge guide hole 203, and it connects the inner liquid inlet flow channel 102 and the piston chamber 301. The liquid inlet guide hole 206 is opened or closed by the liquid inlet check valve 5. The outer liquid inlet flow channel 101a is located in the water inlet pipe 10 1 and is connected with the inner liquid inlet channel 102. When the high-pressure plunger pump of the utility model is filled with liquid, the effective volume of the piston chamber 301 of the base 3 is expanded under the action of the plunger assembly, and a negative pressure is formed in the piston chamber 301, and the liquid inlet check valve 5 is moved in the first valve chamber 204 to open the liquid inlet channel. At this time, the liquid can enter the piston chamber 301 through the outer liquid inlet channel 101a of the water inlet pipe 101, the inner liquid inlet channel 102 and the liquid inlet guide hole 206 in sequence.

[0034] like Figure 2 As shown, the plunger assembly includes a crankshaft 7, a ball bearing 8 and an eccentric wheel 9. A matching groove 701 is opened at one end of the crankshaft 7, and the ball bearing 8 is embedded in the matching groove 701. The eccentric wheel 9 has a base portion 901, and the base portion 901 is embedded in the inner ring of the ball bearing 8 and is eccentrically connected to the output end of the motor 4. When the high-pressure plunger pump of the utility model is in operation, the motor 4 first drives the eccentric wheel 9 to rotate eccentrically, and the eccentric wheel 9 pushes the crankshaft 7 through the ball bearing 8 to make it swing. The ball bearing 8 is used to provide support for the eccentric wheel 9, and enable the eccentric wheel 9 to rotate faster and more smoothly, and reduce the energy loss during its rotation, so as to achieve efficient and silent driving.

[0035] like Figure 2 As shown, the eccentric wheel 9 also has a boss portion 902 located on the outer wall of the base portion 901, and the boss portion 902 abuts against the outer wall of the ball bearing 8, so that the eccentric wheel 9 is supported by the ball bearing 8 at the bottom to avoid falling, thereby maintaining a stable connection with the crankshaft 7 and the motor 4.

[0036] like Figure 2As shown, the plunger assembly also includes a diaphragm 10, which is connected to the other end of the crankshaft 7. When the crankshaft 7 swings under the action of the eccentric wheel 9, it drives the diaphragm 10 to reciprocate and deform back and forth, thereby realizing the change of the effective volume of the piston chamber 301. The diaphragm 10 also cooperates with the step between the inner wall of the compression chamber, and the step is used to limit the displacement of the diaphragm 10, so that it can be stably matched with the base 3.

[0037] Furthermore, both the liquid inlet check valve 5 and the liquid discharge check valve 6 are umbrella valves.

[0038] like Figure 1 , Figure 2 and Figure 7 As shown, the water inlet and outlet cover 1, the compression chamber 2 and the base 3 are detachably fixed by threaded fasteners 11. The threaded connection is a quick and convenient detachable connection method, which facilitates the assembly of the water inlet and outlet cover 1, the compression chamber 2 and the base 3, and utilizes the self-locking property of the thread to keep the water inlet and outlet cover 1, the compression chamber 2 and the base 3 firmly connected.

[0039] Combination Figures 1 to 8 When the plunger pump of the utility model is in operation, the motor 4 drives the eccentric wheel 9 of the plunger assembly to rotate eccentrically, and the eccentric wheel 9 pushes the crankshaft 7 through the ball bearing 8 to make it swing, and the crankshaft 7 drives the diaphragm 10 to deform back and forth, thereby realizing the change of the effective volume of the piston chamber 301. More specifically, when liquid is inlet, the diaphragm 10 is pulled backward and deformed to expand the effective volume of the piston chamber 301, and negative pressure is formed in the cavity to make the liquid inlet check valve 5 move toward the piston chamber 301 to open the liquid inlet guide hole 206 of the liquid inlet flow channel, and the liquid passes through the outer liquid inlet flow channel 1 of the water inlet pipe 101 in turn. 01a, the inner liquid inlet channel 102 and the liquid inlet guide hole 206 in the water inlet and outlet cover 1 enter the piston chamber 301 to complete the liquid intake. When pumping liquid, the diaphragm 10 is pushed forward and deformed to reduce the effective volume of the piston chamber 301. The pressure in the cavity increases, pushing the discharge check valve 6 to move back to the piston chamber 301 to open the discharge guide hole 203 of the discharge channel. At this time, the inner discharge channel 202 is connected with the piston chamber 301. The liquid overflows into the inner discharge channel 202 through the discharge guide hole 203 and can be discharged directly through the outer discharge channel 201a to the drain pipe 201.

[0040] The above embodiments and descriptions are only for explaining the principle and the best embodiment of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected.

Claims

1. A high-pressure plunger pump with anti-attenuation pump fluid pressure, comprising a water inlet and outlet cover (1), a compression chamber (2) and a base (3) arranged in sequence from front to back, a motor (4) being arranged on the outer wall of the base (3), a piston chamber (301) being arranged in the base (3), a plunger assembly connected to the output end of the motor (4) being arranged in the piston chamber (301), a water inlet pipe (101) being formed on the outer wall of the water inlet and outlet cover (1), a liquid inlet channel communicating with the piston chamber (301) being formed inside the water inlet pipe (101), the water inlet and outlet cover (1) and the compression chamber (2), the liquid inlet channel being opened and closed by a liquid inlet check valve (5), characterized in that: A drainage pipe (201) is formed on the outer wall of the compression chamber (2), and the drainage pipe (201) and the interior of the compression chamber (2) form a drainage channel that is connected to the piston chamber (301). The drainage channel is opened and closed by a drainage one-way valve (6). The drainage channel comprises an inner drainage channel (202), a drainage guide hole (203) and an outer drainage channel (201a). The inner drainage channel (202) is located on a side of the compression chamber (2) away from the piston chamber (301), and is connected to the piston chamber (301) through the drainage guide hole (203). The drainage guide hole (203) is opened or closed by the drainage one-way valve (6). The outer drainage channel (201a) is located inside the drainage pipe (201), and is opposite to and connected to the inner drainage channel (202).

2. A high-pressure plunger pump with pump fluid pressure resistance attenuation according to claim 1, characterized in that: The compression chamber (2) is provided with a first valve chamber (204) and a second valve chamber (205), the first valve chamber (204) and the second valve chamber (205) are respectively located on one side of the liquid inlet flow channel and the liquid discharge flow channel, the liquid inlet check valve (5) and the liquid discharge check valve (6) are respectively movably arranged in the first valve chamber (204) and the second valve chamber (205), and when moving, they respectively open and close the liquid inlet flow channel and the liquid discharge flow channel.

3. A high-pressure plunger pump with pump fluid pressure resistance attenuation according to claim 1, characterized in that: The liquid inlet flow channel comprises an inner liquid inlet flow channel (102), a liquid inlet guide hole (206) and an outer liquid inlet flow channel (101a); the inner liquid inlet flow channel (102) is located inside the water inlet and outlet cover (1); the liquid inlet guide hole (206) is located in the compression chamber (2) and is connected to the inner liquid inlet flow channel (102) and the piston chamber (301); the liquid inlet guide hole (206) is opened or closed by a liquid inlet one-way valve (5); and the outer liquid inlet flow channel (101a) is located inside the water inlet pipe (101) and is connected to the inner liquid inlet flow channel (102).

4. A high-pressure plunger pump with pump fluid pressure resistance attenuation according to claim 1, characterized in that: The plunger assembly comprises a crankshaft (7), a ball bearing (8) and an eccentric wheel (9); a matching groove (701) is provided at one end of the crankshaft (7); the ball bearing (8) is embedded in the matching groove (701); the eccentric wheel (9) has a base portion (901); the base portion (901) is embedded in the inner ring of the ball bearing (8) and is eccentrically connected to the output end of the motor (4).

5. A high-pressure plunger pump with pump fluid pressure resistance attenuation according to claim 4, characterized in that: The eccentric wheel (9) further comprises a boss portion (902) located on the outer wall of the base portion (901), and the boss portion (902) abuts against the outer wall of the ball bearing (8).

6. A high-pressure plunger pump with pump fluid pressure resistance attenuation according to claim 4, characterized in that: The plunger assembly also includes a diaphragm (10), which is connected to the other end of the crankshaft (7) and cooperates with the step between the diaphragm and the inner wall of the compression chamber.

7. A high-pressure plunger pump with pump fluid pressure resistance attenuation according to claim 1, characterized in that: The liquid inlet check valve (5) and the liquid discharge check valve (6) are both umbrella valves.

8. The high-pressure plunger pump with pump fluid pressure resistance attenuation according to claim 1, characterized in that: The water inlet and outlet cover (1), the compression chamber (2) and the base (3) are detachably fixed via threaded fasteners (11).

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