Horizontally opposed piston pump

Abstract

The horizontally-opposed piston pump comprises a rack, a driving mechanism, a crankshaft, a pump body, pistons, connecting rods, a feeding pipe and a discharging pipe, the horizontally-arranged crankshaft is installed on the rack and comprises a plurality of connecting rod neck sets, each connecting rod neck set comprises two adjacent connecting rod necks, the phase difference of the two connecting rod necks in each connecting rod neck set is 180 degrees, and the two connecting rod necks in each connecting rod neck set are connected through a connecting rod. A driving mechanism for driving the crankshaft to rotate is installed on the rack, two pump bodies are fixed to the rack and symmetrically distributed on the two sides of the crankshaft, feeding cavities and discharging cavities are formed in the pump bodies, the feeding cavities of the two pump bodies are connected with the same feeding pipe, and the discharging cavities of the two pump bodies are connected with the same discharging pipe; according to the invention, the crankshaft, the connecting rod and the piston are matched, so that the piston pump can drive each cylinder of the piston pump to move through one driving mechanism, the structure of the device becomes simpler, and the transmission efficiency is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, particularly to the technical field of piston pumps. Background Art

[0002] A piston pump is a commonly used reciprocating pump. Structurally, it can be divided into single-cylinder and multi-cylinder types. Its characteristics include a relatively high head; it is suitable for transporting oil emulsions without solid particles at normal temperature, etc.; it is used in oil fields, coal seam water injection, oil injection, oil production; as a power pump for hydraulic presses and water presses, for hydraulic sand cleaning, and for transporting ammonia liquid in fertilizer factories, etc.; when a piston pump is used as a sludge pump, the following problems exist: the single-cylinder or single-group structure results in large output pulsation and severe pipeline vibration; the plunger component is easily corroded and worn by the sludge medium, with a short service life; the traditional valve body structure is prone to blockage in sludge with a high solid content, and the transmission efficiency of the power system is low, with high energy consumption.

[0003] The existing patent CN216812041U discloses a vertical piston pump device, which can effectively convey the medium, but one driving mechanism can only drive one piston, that is, only one cylinder can be driven to move. When the device is multi-cylinder, multiple driving mechanisms need to be set, and the device will become more complex and prone to vibration.

[0004] The existing patent CN222650141U discloses a crankshaft connecting rod device and a piston pump using the same, which can drive multiple cylinders of the piston pump to move through the crankshaft connecting rod device. However, due to the different sheet material directions of its multiple crankshaft cams relative to the rotating shaft, the piston pump is prone to vibration due to unbalanced forces. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art, and propose a horizontally opposed piston pump, which can drive multiple cylinders of the piston pump to move with one driving mechanism, and the piston pump has less vibration during operation.

[0006] To achieve the above object, the present invention provides a horizontally opposed piston pump, comprising a frame, a drive mechanism, a crankshaft, a pump body, pistons, connecting rods, a feed pipe, and a discharge pipe. A horizontally arranged crankshaft is installed on the frame. The crankshaft includes a plurality of connecting rod neck groups, each connecting rod neck group comprising two adjacent connecting rod necks with a phase difference of 180° between the two connecting rod necks in the connecting rod neck group. A drive mechanism for driving the crankshaft to rotate is installed on the frame. Two pump bodies are fixed on the frame and symmetrically distributed on both sides of the crankshaft. An inlet chamber and an outlet chamber are provided inside the pump body. The inlet chambers of the two pump bodies are both connected to the same feed pipe, and the outlet chambers of the two pump bodies are both connected to the same discharge pipe. A plurality of horizontally arranged cylinder chambers are provided inside the pump body. The number of cylinder chambers in the same pump body is equal to the number of connecting rod neck groups. The cylinder chambers open on the side of the pump body close to the crankshaft. The cylinder chambers in the two pump bodies correspond one by one. The two corresponding cylinder chambers correspond to a connecting rod group. The two corresponding cylinder chambers respectively correspond to the two connecting rod necks in the corresponding connecting rod neck group. A piston assembly is provided for the corresponding cylinder chamber and connecting rod neck. The piston assembly is composed of a piston and a connecting rod. One end of the connecting rod is rotatably installed on the connecting rod neck, and the other end of the connecting rod is hinged to the piston. The piston extends into the cylinder chamber and cooperates with the cylinder chamber. A plurality of auxiliary chambers corresponding one by one to the cylinder chambers are provided inside the pump body. The auxiliary chambers communicate with the ends of the cylinder chambers far from the crankshaft. An inlet one-way valve is provided between the auxiliary chamber and the inlet chamber, and an outlet one-way valve is provided between the auxiliary chamber and the outlet chamber.

[0007] Preferably, the number of connecting rod neck groups on the crankshaft is 1 - 4.

[0008] Preferably, the frame includes a crankcase. The crankshaft is installed in the crankcase. A plurality of avoidance holes corresponding one by one to the connecting rods are provided on the crankcase, and the connecting rods pass through the corresponding avoidance holes.

[0009] Preferably, the drive mechanism is composed of a motor, a first sprocket, a second sprocket, and a chain. The motor is fixed on the frame. The motor is connected to a first sprocket. The second sprocket is installed at one end of the crankshaft, and the chain is sleeved on both the first sprocket and the second sprocket at the same time.

[0010] Preferably, a sealing assembly is installed on the cylinder cavity. The sealing assembly is composed of a fixed cylinder, a pressing ring, a first sealing ring, a second sealing ring and a third sealing ring. A positioning groove is provided on the inner wall at the opening of the cylinder cavity. The fixed cylinder is inserted into the positioning groove. The fixed cylinder and the cylinder cavity are on the same central axis. The inner diameter of the fixed cylinder is equal to the inner diameter of the cylinder cavity. A pressing ring is fixed on the outer wall of the fixed cylinder. The pressing ring and the fixed cylinder are of an integral structure. The pressing ring abuts against the end of the pump body. The pressing ring and the pump body are fixed by a plurality of bolts. An annular first sealing groove is formed between the fixed cylinder and the bottom of the positioning groove. A first sealing ring is arranged in the first sealing groove. The first sealing ring is in close contact with the outer wall of the piston. An annular second sealing groove is provided on the outer wall of the fixed cylinder. A second sealing ring is arranged in the second sealing groove. The second sealing ring is in close contact with the inner wall of the positioning groove. A plurality of annular third sealing grooves are provided on the inner wall of the fixed cylinder. A third sealing ring is arranged in the third sealing groove. The third sealing ring is in close contact with the outer wall of the piston.

[0011] Preferably, the first sealing ring is a V-shaped PTFE sealing ring, the second sealing ring is an O-shaped fluororubber sealing ring, and the third sealing ring is a graphite-filled metal wound gasket.

[0012] Preferably, the piston is a ceramic piston.

[0013] Preferably, the pump body is composed of a discharge body, an intermediate body, and a feed body connected in sequence from top to bottom. The discharge chamber is formed on the discharge body, the cylinder chamber and the auxiliary chamber are formed on the intermediate body, and the feed chamber is formed on the feed body. The feed check valve is composed of a first feed valve chamber, a second feed valve chamber, a first blocking ball, a first gasket, and a first stop block. The first feed valve chamber is formed at the bottom end of the intermediate body and is connected to the auxiliary chamber. A first blocking ball is provided inside the first feed valve chamber, and several first stop blocks are provided on the inner wall of the first feed valve chamber. The first stop blocks are located above the first blocking ball, and a part of the upper projection of the first blocking ball falls on the first stop blocks. The second feed valve chamber is formed at the top end of the feed body and is connected to the feed chamber. An annular first limiting groove is formed at the top end of the inner wall of the second feed valve chamber. The first gasket is composed of a first main body ring and a first flange. The first main body ring is inserted into the first limiting groove. The inner diameter of the first main body ring is smaller than the outer diameter of the first blocking ball. A first flange is provided around the top end of the outer wall of the first main body ring. The intermediate body and the feed body clamp the first flange. The discharge check valve is composed of a first discharge valve chamber, a second discharge valve chamber, a second blocking ball, a second gasket, and a second stop block. The first discharge valve chamber is formed at the bottom end of the discharge body and is connected to the discharge chamber. A second blocking ball is provided inside the first discharge valve chamber, and several second stop blocks are provided on the inner wall of the first discharge valve chamber. The second stop blocks are located above the second blocking ball, and a part of the upper projection of the second blocking ball falls on the second stop blocks. The second discharge valve chamber is formed at the top end of the intermediate body and is connected to the auxiliary chamber. An annular second limiting groove is formed at the top end of the inner wall of the second discharge valve chamber. The second gasket is composed of a second main body ring and a second flange. The second main body ring is inserted into the second limiting groove. The inner diameter of the second main body ring is smaller than the outer diameter of the second blocking ball. A second flange is provided around the top end of the outer wall of the second main body ring. The intermediate body and the discharge body clamp the second flange.

[0014] Preferably, a first convex ring is provided on the top end surface of the first main body ring. The cross section of the first convex ring is semi-circular. The inner diameter of the first convex ring is equal to the inner diameter of the first main body ring. At least one second convex ring is provided on the inner wall of the first main body ring. A third convex ring is provided around the bottom wall of the first main body ring. The third convex ring is in contact with the bottom wall of the first limiting groove. A fifth convex ring is provided on the top end surface of the second main body ring. The cross section of the fifth convex ring is semi-circular. The inner diameter of the fifth convex ring is equal to the inner diameter of the second main body ring. At least one sixth convex ring is provided on the inner wall of the second main body ring. A seventh convex ring is provided around the bottom wall of the second main body ring. The seventh convex ring is in contact with the bottom wall of the second limiting groove.

[0015] Advantages of the present invention: By cooperating the crankshaft, connecting rod and piston, the piston pump can drive each cylinder of the piston pump through a driving mechanism, making the structure of the device relatively simple and the transmission efficiency higher; The crankshaft, connecting rod, piston and pump body adopt a horizontally opposed layout, making the vibration amplitude of the device smaller during operation; The piston is a ceramic piston, making the piston more wear-resistant and corrosion-resistant, and improving the service life of the device.

[0016] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. Brief Description of the Drawings

[0017] Figure 1 is the front view of the horizontally opposed piston pump of the present invention; Figure 2 is the top sectional view of the horizontally opposed piston pump of the present invention; Figure 3 is the sectional view of the sealing assembly of the horizontally opposed piston pump of the present invention; Figure 4 is the longitudinal sectional view of the pump body of the horizontally opposed piston pump of the present invention; Figure 5 is the sectional view of the first gasket of the horizontally opposed piston pump of the present invention; Figure 6 is the sectional view of the second gasket of the horizontally opposed piston pump of the present invention.

[0018] In the figure: 1 - frame, 2 - crankshaft, 3 - pump body, 4 - cylinder chamber, 10 - motor, 11 - first sprocket, 12 - second sprocket, 15 - crankcase, 16 - avoidance hole, 20 - connecting rod journal, 21 - connecting rod, 22 - piston, 31 - discharge body, 32 - intermediate body, 33 - feed body, 35 - feed chamber, 36 - discharge chamber, 37 - feed pipe, 38 - discharge pipe, 40 - auxiliary chamber, 41 - sealing assembly, 42 - positioning groove, 51 - first feed valve chamber, 52 - second feed valve chamber, 53 - first plug ball, 54 - first stop block, 55 - first gasket, 56 - first limiting groove, 61 - first discharge valve chamber, 62 - second discharge valve chamber, 63 - second plug ball, 64 - second stop block, 65 - second gasket, 66 - second limiting groove, 411 - fixed cylinder, 412 - pressing ring, 415 - first sealing ring, 416 - second sealing ring, 417 - third sealing ring, 551 - first main body ring, 552 - first flange, 553 - first convex ring, 554 - second convex ring, 555 - third convex ring, 651 - second main body ring, 652 - second flange, 653 - fifth convex ring, 654 - sixth convex ring, 655 - seventh convex ring. Detailed Embodiments

[0019] Embodiment 1: Refer to Figure 1 ,Figure 2 The horizontally opposed piston pump of the present invention includes a frame 1, a driving mechanism, a crankshaft 2, a pump body 3, pistons 22, connecting rods 21, a feed pipe 37, and a discharge pipe 38. A horizontally arranged crankshaft 2 is installed on the frame 1. The crankshaft 2 includes a plurality of connecting rod neck groups. Each connecting rod neck group includes two adjacent connecting rod necks 20. The phase difference between the two connecting rod necks 20 in the connecting rod neck group is 180°. A driving mechanism for driving the crankshaft 2 to rotate is installed on the frame 1. Two pump bodies 3 are fixed on the frame 1 and are symmetrically distributed on both sides of the crankshaft 2. An inlet chamber 35 and an outlet chamber 36 are provided inside the pump body 3. The inlet chambers 35 of the two pump bodies 3 are both connected to the same feed pipe 37, and the outlet chambers 36 of the two pump bodies 3 are both connected to the same discharge pipe 38. A plurality of horizontally arranged cylinder chambers 4 are provided inside the pump body 3. The number of cylinder chambers 4 in the same pump body 3 is equal to the number of connecting rod neck groups. The cylinder chambers 4 are open on the side of the pump body 3 close to the crankshaft 2. The cylinder chambers 4 in the two pump bodies 3 correspond one by one. The two corresponding cylinder chambers 4 correspond to a set of connecting rods 21. The two corresponding cylinder chambers 4 respectively correspond to the two connecting rod necks 20 in the corresponding connecting rod neck group. A piston 22 assembly is provided for the corresponding cylinder chamber 4 and connecting rod neck 20. The piston 22 assembly is composed of a piston 22 and a connecting rod 21. One end of the connecting rod 21 is rotatably installed on the connecting rod neck 20, and the other end of the connecting rod 21 is hinged to the piston 22. The piston 22 extends into the cylinder chamber 4, and the piston 22 cooperates with the cylinder chamber 4. A plurality of auxiliary chambers 40 corresponding to the cylinder chambers 4 one by one are provided inside the pump body 3. The auxiliary chambers 40 are communicated with the ends of the cylinder chambers 4 far from the crankshaft 2. A feed check valve is provided between the auxiliary chamber 40 and the feed chamber 35, and a discharge check valve is provided between the auxiliary chamber 40 and the discharge chamber 36.

[0020] The number of connecting rod neck groups on the crankshaft 2 is 1 - 4.

[0021] In order to better protect the crankshaft 2, the frame 1 includes a crankcase 15. The crankshaft 2 is installed in the crankcase 15. A plurality of avoidance holes 16 corresponding to the connecting rods 21 one by one are provided on the crankcase 15, and the connecting rods 21 pass through the corresponding avoidance holes 16.

[0022] Embodiment Two: In order to make the device have better transmission efficiency, the driving mechanism is composed of a motor 10, a first sprocket 11, a second sprocket 12, and a chain. The motor 10 is fixed on the frame 1. The motor 10 is connected to a first sprocket 11. The second sprocket 12 is installed at one end of the crankshaft 2, and the chain is sleeved on the first sprocket 11 and the second sprocket 12 at the same time.

[0023] Embodiment Three: Refer to Figure 3, in order to improve the sealing effect between the cylinder cavity 4 and the piston 22, a sealing assembly 41 is installed on the cylinder cavity 4. The sealing assembly 41 is composed of a fixed cylinder 411, a pressing ring 412, a first sealing ring 415, a second sealing ring 416 and a third sealing ring 417. A positioning groove 42 is provided on the inner wall at the opening of the cylinder cavity 4. The fixed cylinder 411 is inserted into the positioning groove 42. The fixed cylinder 411 and the cylinder cavity 4 are on the same central axis. The inner diameter of the fixed cylinder 411 is equal to the inner diameter of the cylinder cavity 4. A pressing ring 412 is fixed on the outer wall of the fixed cylinder 411. The pressing ring 412 and the fixed cylinder 411 are of an integral structure. The pressing ring 412 abuts against the end of the pump body 3. The pressing ring 412 and the pump body 3 are fixed by a plurality of bolts. An annular first sealing groove is formed between the fixed cylinder 411 and the bottom of the positioning groove 42. The first sealing ring 415 is arranged in the first sealing groove. The first sealing ring 415 is in close contact with the outer wall of the piston 22. An annular second sealing groove is provided on the outer wall of the fixed cylinder 411. The second sealing ring 416 is arranged in the second sealing groove. The second sealing ring 416 is in close contact with the inner wall of the positioning groove 42. A plurality of annular third sealing grooves are provided on the inner wall of the fixed cylinder 411. The third sealing ring 417 is arranged in the third sealing groove. The third sealing ring 417 is in close contact with the outer wall of the piston 22.

[0024] The first sealing ring 415 is a V-shaped PTFE sealing ring, the second sealing ring 416 is an O-shaped fluororubber sealing ring, and the third sealing ring 417 is a graphite-filled metal wound gasket.

[0025] Embodiment Four: In order to improve the service life of the piston 22, the piston 22 is a ceramic piston 22.

[0026] Embodiment Five: Refer to Figure 4, in order to make the structure of the device more compact, the pump body 3 is composed of a discharge body 31, an intermediate body 32, and a feed body 33 connected in sequence from top to bottom. The discharge cavity 36 is opened on the discharge body 31, the cylinder cavity 4 and the auxiliary cavity 40 are opened on the intermediate body 32, and the discharge cavity 36 is opened on the feed body 33. The feed one-way valve is composed of a first feed valve cavity 51, a second feed valve cavity 52, a first blocking ball 53, a first gasket 55, and a first stopper 54. The first feed valve cavity 51 is opened at the bottom end of the intermediate body 32 and is communicated with the auxiliary cavity 40. A first blocking ball 53 is arranged inside the first feed valve cavity 51. A plurality of first stoppers 54 are arranged on the inner wall of the first feed valve cavity 51. The first stoppers 54 are located above the first blocking ball 53. A part of the upper projection of the first blocking ball 53 falls on the first stoppers 54. The second feed valve cavity 52 is opened at the top end of the feed body 33 and is communicated with the feed cavity 35. An annular first gasket 56 is opened at the top end of the inner wall of the second feed valve cavity 52. The first gasket 55 is composed of a first main body ring 551 and a first flange 552. The first main body ring 551 is inserted into the first gasket 56. The inner diameter of the first main body ring 551 is smaller than the outer diameter of the first blocking ball 53. A circle of first flanges 552 is arranged at the top end of the outer wall of the first main body ring 551. The intermediate body 32 and the feed body 33 clamp the first flange 552. The discharge one-way valve is composed of a first discharge valve cavity 61, a second discharge valve cavity 62, a second blocking ball 63, a second gasket 65, and a second stopper 64. The first discharge valve cavity 61 is opened at the bottom end of the discharge body 31 and is communicated with the discharge cavity 36. A second blocking ball 63 is arranged inside the first discharge valve cavity 61. A plurality of second stoppers 64 are arranged on the inner wall of the first discharge valve cavity 61. The second stoppers 64 are located above the second blocking ball 63. A part of the upper projection of the second blocking ball 63 falls on the second stoppers 64. The second discharge valve cavity 62 is opened at the top end of the intermediate body 32 and is communicated with the auxiliary cavity 40. An annular second limiting groove 66 is opened at the top end of the inner wall of the second discharge valve cavity 62. The second gasket 65 is composed of a second main body ring 651 and a second flange 652. The second main body ring 651 is inserted into the second limiting groove 66. The inner diameter of the second main body ring 651 is smaller than the outer diameter of the second blocking ball 63. A circle of second flanges 652 is arranged at the top end of the outer wall of the second main body ring 651. The intermediate body 32 and the discharge body 31 clamp the second flange 652.

[0027] Refer to Figure 5 , in order to improve the sealing performance between the first blocking ball 53 and the first gasket 55, a circle of first convex rings 553 is arranged on the top end surface of the first main body ring 551. The cross section of the first convex rings 553 is semicircular. The inner diameter of the first convex rings 553 is equal to the inner diameter of the first main body ring 551. At least one second convex ring 554 is arranged on the inner wall of the first main body ring 551. A circle of third convex rings 555 is arranged on the bottom wall of the first main body ring 551. The third convex rings 555 are in contact with the bottom wall of the first gasket 56.

[0028] Refer to Figure 6 Figure 6 , in order to improve the sealing performance between the second ball stopper 63 and the second gasket 65, a circle of fifth convex rings 653 is provided on the top end surface of the second main body ring 651. The cross-section of the fifth convex ring 653 is semi-circular, and the inner diameter of the fifth convex ring 653 is equal to the inner diameter of the second main body ring 651. At least one sixth convex ring 654 is provided on the inner wall of the second main body ring 651, and a circle of seventh convex rings 655 is provided on the bottom wall of the second main body ring 651. The seventh convex ring 655 is in contact with the bottom wall of the second limiting groove 66.

[0029] Working process of the present invention: During the working process of the horizontally opposed piston pump of the present invention, taking the piston pump as a sludge pump as an example, the motor 10 drives the crankshaft 2 to rotate through the combination of the first sprocket 11, the chain and the second sprocket 12. The connecting rod neck 20 on the crankshaft 2 drives the piston 22 to reciprocate in the cylinder cavity 4 through the connecting rod 21. When the piston 22 moves towards the direction close to the crankshaft 2, a negative pressure state is formed inside the cylinder cavity 4, and the sludge entering the feed cavity 35 from the feed pipe 37 pushes up the first ball stopper 53 in the feed check valve, and the feed check valve is in an open state. The sludge enters the cylinder cavity 4. During this process, due to the negative pressure state in the cylinder cavity 4, the second ball stopper 63 in the discharge check valve is tightly pressed against the second gasket 65 under the action of the negative pressure, and the discharge check valve is in a closed state; when the piston 22 moves away from the direction of the crankshaft 2, a positive pressure state is formed inside the cylinder cavity 4, and the sludge in the cylinder block 4 pushes up the second ball stopper 63 in the discharge check valve, and the discharge check valve is in an open state. The sludge enters the discharge cavity 36 from the cylinder block 4 and leaves through the discharge pipe 38. During this process, due to the positive pressure state in the cylinder cavity 4, the first ball stopper 53 in the feed check valve is tightly pressed against the first gasket 55 under the action of the negative pressure, and the feed check valve is in a closed state.

[0030] Since the two connecting rod necks included in the same connecting rod neck group respectively correspond to two cylinder cavities 4 in different pump bodies 2, and the two cylinder cavities 4 are in the same feeding or discharging state, the force of the device is relatively balanced, and the vibration during the operation of the device is small.

[0031] The above embodiments are illustrative of the present invention, not limiting of the present invention. Any simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. Horizontally opposed piston pump, characterized in that: The invention comprises a frame (1), a driving mechanism, a crankshaft (2), a pump body (3), a piston (22), a connecting rod (21), a feed pipe (37), and a discharge pipe (38), wherein a horizontally arranged crankshaft (2) is mounted on the frame (1), the crankshaft (2) comprises a plurality of connecting rod neck groups, the connecting rod neck groups comprise two adjacent connecting rod necks (20), the two connecting rod necks (20) in the connecting rod neck groups have a phase difference of 180°, the frame (1) is mounted with a driving mechanism for driving the crankshaft (2) to rotate, and the frame (1) ) are fixed with two pump bodies (3), the two pump bodies (3) are symmetrically distributed on both sides of the crankshaft (2), the pump bodies (3) are provided with a feed chamber (35) and a discharge chamber (36) inside, the feed chambers (35) of the two pump bodies (3) are connected to the same feed pipe (37), the discharge chambers (36) of the two pump bodies (3) are connected to the same discharge pipe (38), the pump body (3) is provided with a plurality of horizontally arranged cylinder chambers (4), the number of cylinder chambers (4) in the same pump body (3) is equal to the number of connecting rod neck groups The cylinder chamber (4) opens at the side of the pump body (3) close to the crankshaft (2), the cylinder chambers (4) in the two pump bodies (3) correspond to each other, the two corresponding cylinder chambers (4) correspond to a connecting rod (21) group, the two corresponding cylinder chambers (4) correspond to two connecting rod necks (20) in the corresponding connecting rod neck group, the corresponding cylinder chambers (4) and connecting rod necks (20) are equipped with a piston (22) assembly, the piston (22) assembly consists of a piston (22) and a connecting rod (21), one end of the connecting rod (21) is rotatably mounted On the connecting rod neck (20), the other end of the connecting rod (21) is hinged to the piston (22), the piston (22) extends into the cylinder cavity (4), the piston (22) and the cylinder cavity (4) cooperate with each other, a plurality of auxiliary cavities (40) corresponding to the cylinder cavities (4) are provided inside the pump body (3), the auxiliary cavities (40) are connected to the end of the cylinder cavity (4) away from the crankshaft (2), a feed check valve is provided between the auxiliary cavity (40) and the feed cavity (35), and a discharge check valve is provided between the auxiliary cavity (40) and the discharge cavity (36).

2. The horizontally opposed piston pump according to claim 1, characterized in that: The number of connecting rod neck groups on the crankshaft (2) is 1-4.

3. The horizontally opposed piston pump according to claim 1, characterized in that: The frame (1) includes a crankcase (15), the crankshaft (2) is installed in the crankcase (15), and the crankcase (15) is provided with a plurality of avoidance holes (16) corresponding to the connecting rods (21) one by one, and the connecting rods (21) pass through the corresponding avoidance holes (16).

4. The horizontally opposed piston pump according to claim 1, characterized in that: The driving mechanism comprises a motor (10), a first sprocket (11), a second sprocket (12) and a chain. The motor (10) is fixed on the frame (1). The motor (10) is connected to a first sprocket (11). The second sprocket (12) is mounted on one end of the crankshaft (2). The chain is simultaneously sleeved on the first sprocket (11) and the second sprocket (12).

5. The horizontally opposed piston pump according to claim 1, characterized in that: A sealing assembly (41) is installed on the cylinder cavity (4), and the sealing assembly (41) is composed of a fixed cylinder (411), a pressure ring (412), a first sealing ring (415), a second sealing ring (416) and a third sealing ring (417). A circle of positioning grooves (42) is provided on the inner wall of the opening of the cylinder cavity (4), and the fixed cylinder (411) is inserted into the positioning grooves (42). The fixed cylinder (411) and the cylinder cavity (4) are located on the same central axis. The inner diameter of the fixed cylinder (411) is equal to the inner diameter of the cylinder cavity (4). A circle of pressure rings (412) is fixed on the outer wall of the fixed cylinder (411). The pressure ring (412) and the fixed cylinder (411) are an integrated structure. The pressure ring (412) abuts against the end of the pump body (3). The pressure ring (412) 12) is fixed to the pump body (3) by a plurality of bolts, an annular first sealing groove is formed between the fixing cylinder (411) and the bottom of the positioning groove (42), a first sealing ring (415) is arranged in the first sealing groove, and the first sealing ring (415) is in close contact with the outer wall of the piston (22), an annular second sealing groove is arranged on the outer wall of the fixing cylinder (411), a second sealing ring (416) is arranged in the second sealing groove, and the second sealing ring (416) is in close contact with the inner wall of the positioning groove (42), a plurality of annular third sealing grooves are arranged on the inner wall of the fixing cylinder (411), a third sealing ring (417) is arranged in the third sealing groove, and the third sealing ring (417) is in close contact with the outer wall of the piston (22).

6. The horizontally opposed piston pump according to claim 5, characterized in that: The first sealing ring (415) is a V-shaped PTFE sealing ring, the second sealing ring (416) is an O-shaped fluororubber sealing ring, and the third sealing ring (417) is a graphite-filled metal winding gasket.

7. The horizontally opposed piston pump according to claim 1, characterized in that: The piston (22) is a ceramic piston (22).

8. The horizontally opposed piston pump according to claim 1, characterized in that: The pump body (3) is composed of a discharge body (31), an intermediate body (32) and a feed body (33) which are connected in sequence from top to bottom; a discharge chamber (36) is provided on the discharge body (31); a cylinder chamber (4) and an auxiliary chamber (40) are provided on the intermediate body (32); and the discharge chamber (36) is provided on the feed body (33); the feed check valve is composed of a first feed valve chamber (51), a second feed valve chamber (52), a first blocking ball (53), a first sealing gasket (55) and a first stopper (54); the first feed valve chamber (51) is provided at the bottom end of the intermediate body (32) and is connected to the auxiliary chamber (40); a first blocking ball (53) is provided inside the first feed valve chamber (51); and the first feed valve chamber (52) is provided with a first blocking ball (53). A plurality of first stoppers (54) are provided on the inner wall of the valve cavity (51), the first stoppers (54) being located above the first blocking ball (53), and a portion of the upper projection of the first blocking ball (53) falls on the first stoppers (54). The second feed valve cavity (52) is provided at the top end of the feed body (33) and is in communication with the feed cavity (35). An annular first sealing gasket (56) is provided at the top end of the inner wall of the second feed valve cavity (52), the first sealing gasket (55) being composed of a first main body ring (551) and a first flange (552). The first main body ring (551) is inserted into the first sealing gasket (56), the inner diameter of the first main body ring (551) being smaller than the outer diameter of the first blocking ball (53), and the first main body ring (551) being smaller than the outer diameter of the first blocking ball (53). A circle of first flange (552) is provided at the top of the outer wall of the body ring (551); the intermediate body (32) and the feed body (33) clamp the first flange (552); the discharge one-way valve comprises a first discharge valve cavity (61), a second discharge valve cavity (62), a second blocking ball (63), a second sealing gasket (65) and a second blocking block (64); the first discharge valve cavity (61) is opened at the bottom end of the discharge body (31) and is connected to the discharge cavity (36); a second blocking ball (63) is provided inside the first discharge valve cavity (61); a plurality of second blocking blocks (64) are provided on the inner wall of the first discharge valve cavity (61); the second blocking block (64) is located above the second blocking ball (63); the second blocking ball (63) A portion of the upper projection falls on the second stopper (64); the second discharge valve chamber (62) is opened at the top of the intermediate body (32) and is connected to the auxiliary chamber (40); an annular second limiting groove (66) is opened at the top of the inner wall of the second discharge valve chamber (62); the second sealing gasket (65) is composed of a second main body ring (651) and a second flange (652); the second main body ring (651) is inserted into the second limiting groove (66); the inner diameter of the second main body ring (651) is smaller than the outer diameter of the second blocking ball (63); a circle of second flanges (652) are provided at the top of the outer wall of the second main body ring (651); the intermediate body (32) and the discharge body (31) clamp the second flange (652).

9. The horizontally opposed piston pump according to claim 8, characterized in that: A circle of first convex rings (553) is provided on the top surface of the first main body ring (551); the cross section of the first convex ring (553) is semicircular; the inner diameter of the first convex ring (553) is equal to the inner diameter of the first main body ring (551); at least one second convex ring (554) is provided on the inner wall of the first main body ring (551); a circle of third convex rings (555) is provided on the bottom wall of the first main body ring (551); the third convex ring (555) contacts the bottom wall of the first sealing gasket (56); A circle of fifth convex rings (653) is provided on the top surface of the second main body ring (651); the cross section of the fifth convex ring (653) is semicircular; the inner diameter of the fifth convex ring (653) is equal to the inner diameter of the second main body ring (651); at least one sixth convex ring (654) is provided on the inner wall of the second main body ring (651); a circle of seventh convex rings (655) is provided on the bottom wall of the second main body ring (651); the seventh convex ring (655) contacts the bottom wall of the second limiting groove (66).

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