Slurry pump string type valve group structure

Abstract

A string type valve group structure of a slurry pump is characterized in that a water inlet cavity and a water drainage cavity which are communicated with each other are arranged in a pump head body from bottom to top, and a water inlet valve assembly, a water inlet guide sleeve, a water drainage valve assembly, a water drainage valve gland and a valve cover assembly are sequentially arranged in the pump head body from bottom to top; a tandem structure from top to bottom is used, the water inlet valve assembly and the water drainage valve assembly are connected in series through the water inlet guide sleeve and the water drainage valve gland, finally, all the components are pressed into a whole in the pump head body through the valve deck, a cylinder cover does not need to be arranged, all the components are basically coaxial, and therefore the positioning difficulty is low when an inner cavity of the pump head body matched with all the components is machined; the machining difficulty of parts is reduced, the cost is low, the structural stability is good, damage and leakage are not prone to occurring, the assembly technological process can be effectively simplified, the requirement for the assembly position precision is low, the technology is simple and convenient, and the production and use efficiency of the slurry pump can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reciprocating mud pumps, in particular to a string-type valve group structure of a mud pump and a valve group assembly method. Background Technique

[0002] As Figure 1 shown, the commonly used valve group structure of the hydraulic end of a mud pump at present includes a pump head body (1). The pump head body (1) includes a water inlet cavity (11) and a water discharge cavity (12). Its working principle is as follows: As the plunger moves to the left, a negative pressure is formed in the water inlet cavity (11), the discharge valve (5) closes, and the inlet valve (2) opens. Mud enters through the lower water inlet hole. Then the plunger (17) moves to the right, a positive pressure is formed in the water inlet cavity (11), the inlet valve (2) closes, the discharge valve (5) opens, and the mud enters the water discharge cavity (12) through the discharge valve (2) and is discharged through the water discharge hole on the side wall of the water discharge cavity (12).

[0003] A valve cover (19) is provided at the upper end of the water discharge cavity (12), and a cylinder head (18) is provided on the side wall of the water inlet cavity (11). The discharge valve (5) and the inlet valve (2) are respectively pressed by corresponding springs. The inlet valve (2) and the discharge valve (5) are kept in a state where the corresponding valve ports are closed under normal pressure. When the pressure of the corresponding valve port reaches the set threshold value controlled by the spring, the corresponding valve will open to realize water inlet and discharge.

[0004] The above structure has the following defects:

[0005] 1. Seals need to be provided on both the valve cover and the cylinder head to maintain the sealing performance inside the pump head body. Therefore, at least two seals for preventing external leakage need to be provided. Seals are vulnerable parts in the working environment of high-pressure mud pumps. Therefore, each seal means an increased possibility of external leakage, resulting in a high probability of external leakage of the pump head body;

[0006] 2. The valve seat of each valve and the corresponding valve port in the pump head body are fixed by taper self-locking. When the pump flow rate is large, the valve and the corresponding valve seat are sometimes flushed out, and the valve stability is poor;

[0007] 3. As Figure 2 shown, since a spring guide seat (20) also needs to be fixedly provided on the cylinder head (18) to press the spring on the inlet valve (2), in order to apply force evenly, the spring must be concentric and coaxial with the valve port and the inlet valve (2). However, the cylinder head (18) is located on one side. Therefore, the assembly position accuracy requirements for the spring guide seat (20) for pressing the spring and the inlet valve (2) are high, and the force on the spring guide seat is uneven, resulting in high requirements for the connection strength between the spring guide seat (20) and the cylinder head (18). The processing cost and processing technology difficulty are also correspondingly higher. If the requirements cannot be met, it is easily damaged.

[0008] In summary, the above valve group structure has complex assembly process, high difficulty in component processing, high processing cost, poor structural stability, easy damage of accessories, and easy leakage, seriously affecting the production and use efficiency of the mud pump. Summary of the Invention

[0009] The utility model provides a mud pump string-type valve group structure and a valve group assembly method for solving the problems mentioned in the background technology, which can effectively simplify the assembly process flow, have low requirements for the accuracy of the assembly position, simple process, simple component processing, low cost, good structural stability, not easy to be damaged and not easy to leak, and can effectively improve the production and use efficiency of the mud pump.

[0010] In order to achieve the above object, the utility model adopts the following technical solutions:

[0011] A mud pump string-type valve group structure includes a pump head body. The feature is that an upper water inlet cavity and a water drainage cavity which are communicated with each other are arranged in the pump head body from bottom to top. An inlet hole is arranged on the pump head body at the bottom of the water inlet cavity. The inlet hole is a stepped hole. A plunger mounting hole is arranged on the pump head body on one side of the water inlet cavity. A total mounting hole is arranged on the pump head body at the upper end of the water drainage cavity. A drainage hole is arranged on the pump head body on the side of the water drainage cavity. An inlet valve assembly, an inlet guide sleeve, a drainage valve assembly, a drainage valve gland and a valve cover assembly are sequentially arranged in the pump head body from bottom to top;

[0012] The inlet valve assembly includes an inlet valve and an inlet valve seat. The inlet valve and the inlet valve seat cooperate with each other and are arranged on the step of the inlet hole. An inlet guide sleeve is arranged above the inlet valve assembly. The inlet guide sleeve is a cylindrical tube. The lower port of the inlet guide sleeve presses on the inlet valve seat. A partition block is arranged in the middle of the inlet guide sleeve, separating the inlet guide sleeve into upper and lower layers. A plurality of through holes are arranged along the radial direction on the wall of each layer of the inlet guide sleeve. Columnar bosses are arranged at the center of the lower end face of the partition block and the center of the upper end face of the inlet valve respectively. An inlet valve spring is further arranged in the inlet guide sleeve. The inlet valve spring is arranged between the lower end face of the partition block and the upper end face of the inlet valve. The two ends of the inlet valve spring are respectively sleeved on the columnar bosses and are coaxial with them;

[0013] The drainage valve assembly includes a drainage valve and a drainage valve seat. The drainage valve seat is arranged above the inlet guide sleeve. The drainage valve and the drainage valve seat are arranged in the pump head body as a separating mechanism for separating the water inlet cavity and the water drainage cavity. The bottom surface of the drainage valve seat presses on the top surface of the inlet guide sleeve to press the inlet guide sleeve tightly;

[0014] The described drain valve gland is arranged above the drain valve assembly. The drain valve gland includes a circular cover body and a cylindrical peripheral edge that protrudes downward along the outer circle of the bottom surface of the cover body and has a certain thickness. A number of square through holes are evenly distributed along the radial direction on the upper edge of the cylindrical peripheral edge. Columnar bosses are provided at the center of the bottom surface of the circular cover body and the center of the upper end surface of the drain valve. A drain valve spring is also provided inside the cylindrical peripheral edge. The drain valve spring is arranged between the lower end surface of the circular cover body and the upper end surface of the drain valve, and both ends of the drain valve spring are respectively sleeved on the bosses and are coaxial with the bosses.

[0015] The described valve cover assembly is installed on the total installation hole of the pump head body. The valve cover assembly includes a valve cover fixing seat and a valve cover body. The valve cover fixing seat is an annular flange. The central hole of the valve cover fixing seat is coaxial with the total installation hole. An internal thread is provided along the axial direction on the inner wall of the central hole of the valve cover fixing seat. The surrounding flange holes are fixed to the pump head body through bolts. The valve cover body is disc-shaped, and an external thread that matches the central hole of the valve cover fixing seat is provided on the side wall of the valve cover body.

[0016] A further solution is: in order to reduce the noise generated by valve impact, concave buffer pad installation holes are also provided in the bosses at the lower end surfaces of the circular cover body and the partition block respectively. Sound-absorbing buffer pads made of elastic materials that protrude outward by a certain height are provided in the buffer pad installation holes.

[0017] A further solution is: for the overall sealing performance, sealing rings are provided at the contact parts between the outer wall of the inlet valve seat, the outer wall of the drain valve seat, the upper outer side surface of the inlet guide sleeve, and the upper outer side surface of the drain valve gland and the inner wall of the pump head body respectively.

[0018] The beneficial effects of the present utility model are as follows: Using a series structure from top to bottom, the inlet valve assembly and the drain valve assembly are connected in series through the inlet guide sleeve and the drain valve gland, and finally all components are tightly pressed into one body in the pump head body by the valve cover. There is no need to set a cylinder head anymore, and all components are basically coaxial. Therefore, the positioning difficulty during the processing of the inner cavity of the pump head body that cooperates with each component is low, the processing difficulty of the components is reduced, the cost is low, the structural stability is good, it is not easy to be damaged or leaked, the assembly process flow can be effectively simplified, the requirement for the assembly position accuracy is low, the process is simple, and the production and use efficiency of the mud pump can be effectively improved. Brief Description of the Drawings

[0019] Figure 1 It is a structural schematic diagram of the prior art;

[0020] Figure 2 It is a structural schematic diagram of the prior art spring guide seat;

[0021] Figure 3 It is a structural schematic diagram of the embodiment of the present utility model;

[0022] Figure 4Schematic diagram of the inner cavity structure of the pump head body in the embodiment of the present utility model;

[0023] Figure 5 Schematic diagram of the structure of the water inlet guide sleeve in the embodiment of the present utility model

[0024] Figure 6 Schematic diagram of the structure of the water inlet valve gland in the embodiment of the present utility model;

[0025] Figure 7 Schematic diagram of the appearance of the water inlet valve gland in the embodiment of the present utility model. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Embodiment

[0027] As Figures 3 to 6 shown, a mud pump string valve group structure includes a pump head body 1. Among them, an inlet cavity 11 and a drainage cavity 12 that communicate with each other are provided in the pump head body 1 from bottom to top. An inlet hole 13 is provided on the pump head body 1 at the bottom of the inlet cavity 11. The inlet hole 13 is a stepped hole. A plunger mounting hole 14 is provided on the pump head body 1 on one side of the inlet cavity 11. A main mounting hole 15 is provided on the pump head body 1 at the upper end of the drainage cavity 12. A drainage hole 16 is provided on the pump head body 1 on the side of the drainage cavity 12; an inlet valve assembly, a water inlet guide sleeve 4, a drainage valve assembly, a drainage valve gland 7, and a valve cover assembly are sequentially provided in the pump head body 1 from bottom to top;

[0028] The inlet valve assembly includes an inlet valve 2 and an inlet valve seat 3. The inlet valve 2 and the inlet valve seat 3 cooperate with each other and are arranged on the step of the inlet hole 13. A water inlet guide sleeve 4 is provided above the inlet valve assembly. The water inlet guide sleeve 4 is a cylindrical tube. The lower port of the water inlet guide sleeve 4 is pressed on the inlet valve seat 3. A partition block 41 is provided in the middle of the water inlet guide sleeve 4, dividing the water inlet guide sleeve 4 into upper and lower layers. A plurality of through holes are provided in the wall of each layer of the water inlet guide sleeve 4 along the radial direction. Columnar bosses are provided at the center of the lower end face of the partition block 41 and the center of the upper end face of the inlet valve 2 respectively. A water inlet valve spring 42 is further provided in the water inlet guide sleeve 4. The water inlet valve spring 42 is arranged between the lower end face of the partition block 41 and the upper end face of the inlet valve 2. The two ends of the water inlet valve spring 42 are respectively sleeved on the columnar bosses and are coaxial with them;

[0029] The drainage valve assembly includes a drainage valve 5 and a drainage valve seat 6. The drainage valve seat 6 is arranged above the water inlet guide sleeve 4. The drainage valve 5 and the drainage valve seat 6 are arranged in the pump head body 1 as a partition mechanism for separating the inlet cavity 11 and the drainage cavity 12. The bottom surface of the drainage valve seat 6 is pressed on the top surface of the water inlet guide sleeve 4 to press the water inlet guide sleeve 4 tightly;

[0030] The described drain valve gland 7 is arranged above the drain valve assembly. The drain valve gland 7 includes a circular cover body 71 and a cylindrical peripheral edge 72 that protrudes downward along the outer circle of the bottom surface of the circular cover body 71 and has a certain thickness. A number of square through holes are evenly distributed along the radial direction on the cylindrical peripheral edge 72. A columnar boss is provided at the center of the bottom surface of the circular cover body 71 and at the center of the upper end surface of the drain valve 6. A drain valve spring 73 is also provided inside the cylindrical peripheral edge 72. The drain valve spring 73 is arranged between the lower end surface of the circular cover body 71 and the upper end surface of the drain valve 6. Both ends of the drain valve spring 73 are respectively sleeved on the bosses and are coaxial with the bosses.

[0031] The described valve cover assembly is installed on the total installation hole 15 of the pump head body. The valve cover assembly includes a valve cover fixing seat 8 and a valve cover body 9. The valve cover fixing seat 8 is an annular flange. The center hole of the valve cover fixing seat 8 is coaxial with the total installation hole 15. An internal thread 81 is provided along the axial direction on the inner wall of the center hole of the valve cover fixing seat 8. The surrounding flange holes are fixedly connected to the pump head body 1 through bolts. The valve cover body 9 is disc-shaped. An external thread that matches the center hole of the valve cover fixing seat 8 is provided on the side wall of the valve cover body 9.

[0032] In order to reduce the noise generated by valve impact, concave buffer pad installation holes are also provided in the bosses at the lower end surfaces of the circular cover body 71 and the partition block 41. A sound-absorbing buffer pad 10 made of an elastic material that protrudes outward by a certain height is provided in the buffer pad installation holes.

[0033] For the overall sealing performance, sealing rings are provided at the contact parts of the outer wall of the inlet valve seat 3, the outer wall of the drain valve seat 6, the upper outer side surface of the inlet guide sleeve 4, and the upper outer side surface of the drain valve gland 7 with the inner wall of the pump head body 1 respectively.

Claims

1. A series valve group structure of a mud pump, including a pump head body, characterized in that Inside the pump head body, there are an inlet chamber and a drain chamber that communicate with each other from bottom to top. On the pump head body at the bottom of the inlet chamber, there is an inlet hole, which is a stepped hole. On the pump head body on one side of the inlet chamber, there is a plunger mounting hole. On the pump head body at the upper end of the drain chamber, there is a main mounting hole, and on the side of the drain chamber on the pump head body, there is a drain hole; Inside the pump head body, there are successively arranged an inlet valve assembly, an inlet guide sleeve, a drain valve assembly, a drain valve gland, and a valve cover assembly from bottom to top; The inlet valve assembly includes an inlet valve and an inlet valve seat. The inlet valve and the inlet valve seat cooperate with each other and are arranged on the step of the inlet hole. Above the inlet valve assembly, there is an inlet guide sleeve. The inlet guide sleeve is a cylindrical tube. The lower port of the inlet guide sleeve presses on the inlet valve seat. In the middle of the inlet guide sleeve, there is a partition block that divides the inlet guide sleeve into upper and lower layers. On each layer of the wall of the inlet guide sleeve, there are several through holes arranged radially. At the center of the lower end face of the partition block and at the center of the upper end face of the inlet valve, there are columnar bosses respectively. Inside the inlet guide sleeve, there is also an inlet valve spring. The inlet valve spring is arranged between the lower end face of the partition block and the upper end face of the inlet valve. The two ends of the inlet valve spring are respectively sleeved on the columnar bosses and are coaxial with them; The drain valve assembly includes a drain valve and a drain valve seat. The drain valve seat is arranged above the inlet guide sleeve. The drain valve and the drain valve seat are arranged in the pump head body as a partition mechanism for separating the inlet chamber and the drain chamber. The bottom surface of the drain valve seat presses on the top surface of the inlet guide sleeve to press the inlet guide sleeve tightly; The drain valve gland is arranged above the drain valve assembly. The drain valve gland includes a circular cover body and a cylindrical peripheral edge that protrudes downward along the outer circle of the bottom surface of the cover body and has a certain thickness. On the cylindrical peripheral edge, there are several square through holes arranged radially. At the center of the bottom surface of the circular cover body and at the center of the upper end face of the drain valve, there are columnar bosses respectively. Inside the cylindrical peripheral edge, there is also a drain valve spring. The drain valve spring is arranged between the lower end face of the circular cover body and the upper end face of the drain valve. The two ends of the drain valve spring are respectively sleeved on the bosses and are coaxial with the bosses; The valve cover assembly is installed on the main mounting hole of the pump head body. The valve cover assembly includes a valve cover fixing seat and a valve cover body. The valve cover fixing seat is an annular flange. The central hole of the valve cover fixing seat is coaxial with the main mounting hole. On the inner wall of the central hole of the valve cover fixing seat, there is an internal thread arranged axially. The surrounding flange holes are fixed to the pump head body through bolts. The valve cover body is a disc-shaped. On the side wall of the valve cover body, there is an external thread that matches the central hole of the valve cover fixing seat.

2. The structure of the series valve group of the mud pump according to claim 1, characterized in that: In the bosses on the lower end face of the circular cover body and the partition block, there are also concave buffer pad mounting holes respectively. In the buffer pad mounting holes, there are sound-absorbing buffer pads made of elastic materials that protrude outward by a certain height.

3. The structure of a series valve set of a mud pump according to claim 1 or 2, characterized in that: On the outer wall of the inlet valve seat, on the outer wall of the drain valve seat, on the outer side surface of the upper end of the inlet guide sleeve, and on the outer side surface of the upper end of the drain valve gland, there are sealing rings at the contact parts with the inner wall of the pump head body respectively.

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