Relief valve structure for plunger pump

Abstract

The present invention complies with the technical field of overflow valves, and mainly proposes an overflow valve structure for a plunger pump. It includes a valve body, the valve body is threadedly connected with an adjusting bolt, the valve body is slidably connected with a valve core, a spring is arranged between the valve core and the adjusting bolt, the valve body is provided with an overflow inlet, the valve core is sealed and cooperated with the overflow inlet, the valve body is provided with an overflow outlet, the first sealing member is provided with a cavity, the valve body is provided with a first channel, and the valve body is fixedly connected with a first sealing member. When the plunger pump needs to release pressure, the present invention moves the valve core and drives the first sealing member to contract, thereby reducing the contact area between the first sealing member and the rapidly outflowing liquid, reducing the impact of the liquid on the first sealing member when it flows out rapidly, and at the same time reducing the first sealing member's obstruction of the gap between the valve core and the valve body, reducing the probability of liquid cavitation, thereby reducing the occurrence of cavitation, and extending the service life of the device.

Description

Technical Field

[0001] The present invention aims at the technical field of overflow valves and particularly proposes an overflow valve structure for a plunger pump. Background Art

[0002] In the piston pump system, the relief valve (sometimes called a safety valve) plays an important role, mainly involving pressure control and system protection. The working principle of the relief valve is: the relief valve is set at a specific pressure value. Once the system pressure reaches or exceeds this preset value, the relief valve will open, allowing excess hydraulic oil to flow back to the tank or other low-pressure areas, thereby preventing the system pressure from further increasing.

[0003] When the existing relief valve is in use, the liquid in the plunger pump passes through the gap between the valve core and the valve body during the pressure relief process. Because the gap is small, the liquid flow rate is fast. The high-speed flowing liquid will cavitate and produce cavitation. When the valve core is unsealed, the sealing ring recovers from the squeezed state to its original state, so that the gap is further reduced, and the flow rate of the liquid will be further accelerated. In addition, the high-speed flowing liquid will also impact the sealing ring between the valve core and the valve body. The sealing ring is subjected to cavitation and the impact of high-speed flowing liquid for a long time, which will lead to its service life being shortened. Once the sealing ring is damaged, the entire plunger pump can no longer work normally. Summary of the invention

[0004] In order to overcome the shortcoming that the sealing ring of the existing device is easily damaged, the present invention provides a relief valve structure for a plunger pump.

[0005] The technical solution is as follows: an overflow valve structure for a plunger pump, comprising a valve body, an adjusting bolt being threadedly connected to one side of the valve body, a valve core being slidably connected to the valve body, a spring being arranged between the valve core and the adjusting bolt, an overflow inlet being arranged on the side of the valve body away from the adjusting bolt, the valve core being sealed in cooperation with the overflow inlet, an overflow outlet being arranged at a position of the valve body close to the overflow inlet, the first sealing member being provided with a cavity, a first channel being arranged on the side of the valve body away from the overflow outlet, a first sealing member being fixedly connected to the valve body, and the first sealing member being sealed in cooperation with the valve core.

[0006] Preferably, a second channel is provided on a side of the valve body close to the first sealing member, the second channel is communicated with the first channel, the second channel is communicated with the first sealing member, a first baffle is fixedly connected in the valve body, the valve body, the valve core and a side of the first baffle close to the overflow inlet cooperate to form a first cavity, the first cavity is communicated with the overflow outlet, the valve core is provided with a sliding member, the sliding member is slidably connected to the valve body, the first baffle is slidably connected to the valve core, the valve body, the valve core, the first baffle and the sliding member cooperate to form a second cavity, the second cavity and the first sealing member are both filled with liquid, and the valve body is provided with a third channel, the third channel communicates the first channel with the second cavity.

[0007] Preferably, the valve core consists of a truncated cone portion, a round rod portion and a disc portion, and the maximum diameter of the truncated cone portion of the valve core is smaller than the diameter of the first cavity.

[0008] Preferably, the truncated cone portion of the valve core is provided with an annular groove for increasing the contact area between the valve core and the first sealing member.

[0009] Preferably, a second seal is further included, the second seal is provided with a cavity, the second seal is fixedly connected to the valve body, the second seal is located on the side of the first seal away from the overflow inlet, the second seal is sealed with the valve core, the valve body is provided with a fourth channel, and the fourth channel connects the first channel and the second seal.

[0010] Preferably, a first gate is slidably connected in the valve body, a spring is provided between the first gate and the valve body, and the first gate cooperates with the first channel blockage.

[0011] Preferably, a sliding rod is slidably connected in the valve body, a second gate slidably connected to the valve body is fixedly connected to the sliding rod, a tension spring is arranged between the second gate and the valve body on one side close to the sliding rod, and the first gate is provided with a groove which cooperates with the sliding rod to limit the position.

[0012] Preferably, the second gate cooperates with the fourth channel blockage.

[0013] Preferably, the sliding member is slidably connected to a limit column, a tension spring is arranged between the limit column and the sliding member, the sliding member is connected to the first channel through a hose, the valve core is provided with evenly distributed limit grooves, the limit column is limitedly cooperated with the adjacent limit grooves on the valve core, a second baffle is fixedly connected to the valve body, the sliding member is slidably connected to the valve core, and a circumferentially evenly distributed spring is arranged between the second baffle and the sliding member.

[0014] Preferably, an annular inclined surface is provided on one side of the limiting column close to the valve core, so as to enable the limiting column to be inserted into an adjacent limiting groove on the valve core.

[0015] Beneficial effects of the present invention: When the plunger pump needs to relieve pressure, the present invention moves the valve core and drives the first seal to contract, thereby reducing the contact area between the first seal and the rapidly flowing liquid, reducing the impact of the liquid on the first seal when it flows out rapidly, and at the same time reducing the obstruction of the first seal to the gap between the valve core and the valve body, thereby reducing the probability of liquid cavitation, thereby reducing the occurrence of cavitation and extending the service life of the device.

[0016] When the first seal is damaged, the first gate blocks the first channel and the second gate releases the blockage of the fourth channel, so that the second seal temporarily replaces the first seal to avoid affecting the normal operation of the plunger pump due to damage to the first seal.

[0017] When the first sealing member is damaged, the limiting column releases the connection between the valve core and the sliding member, so that the sliding member presses the liquid in the second cavity into the second sealing member, causing the second sealing member to expand and cooperate with the valve core to form a seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 It is a three-dimensional structural cross-sectional view of the valve body of the present invention;

[0020] Figure 3 It is a three-dimensional structural cross-sectional view of the valve body and valve core of the present invention;

[0021] Figure 4 It is a three-dimensional structural cross-sectional view of the first sealing member and the second sealing member of the present invention;

[0022] Figure 5 It is a three-dimensional structural cross-sectional view of the first gate, the sliding rod and the second gate of the present invention.

[0023] Explanation of the accompanying drawings: 1-valve body, 101-overflow inlet, 102-overflow outlet, 103-first channel, 104-second channel, 105-third channel, 106-fourth channel, 2-adjusting bolt, 3-valve core, 4-first sealing member, 5-first baffle, 6-sliding member, 7-second sealing member, 8-first gate, 9-sliding rod, 10-second gate, 11-limiting column, 12-second baffle. DETAILED DESCRIPTION

[0024] The following is a detailed description of the overflow valve structure for the plunger pump provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0025] When the overflow valve in the existing plunger pump is in use, the high-speed flowing liquid will cavitate and produce cavitation, which will accelerate the damage of the sealing ring. Once the sealing ring in the overflow valve is damaged, the entire plunger pump cannot work normally.

[0026] Embodiment 1: overflow valve structure for plunger pump, combined with Figure 1-Figure 4As shown, it includes a valve body 1, an adjusting bolt 2 is threadedly connected to the upper side of the valve body 1, and the initial compression amount of the spring between the adjusting bolt 2 and the valve core 3 is adjusted by rotating the adjusting bolt 2 to change the pressure required for the liquid to push the valve core 3. The valve core 3 is slidably connected in the valve body 1, and a spring is arranged between the valve core 3 and the adjusting bolt 2. The spring is initially in a compressed state and is used to make the valve core 3 block the overflow inlet 101. The overflow inlet 101 is arranged on the lower side of the valve body 1, and the valve core 3 and the overflow inlet 101 are blocked and matched. An overflow outlet 102 is arranged on the right side of the lower part of the valve body 1. When the liquid pressure in the plunger pump is too large, the liquid in it The overflow inlet 101 pushes the first channel 103 to move upward and is discharged from the overflow outlet 102. In this way, the pressure in the plunger pump is restored to normal. The left side of the valve body 1 is provided with a first channel 103. The lower side of the valve body 1 is fixedly connected with a first sealing member 4. The first sealing member 4 is provided with a cavity. The first sealing member 4 is made of elastic material. The first sealing member 4 is sealed with the valve core 3. The first sealing member 4 is tightly fitted with the valve core 3 in the expanded state to achieve a sealing effect. The lower side of the valve body 1 is provided with a second channel 104. The second channel 104 is connected to the first channel 103. The second channel 104 is connected to the first The sealing member 4 is connected, and a first baffle plate 5 is fixedly connected to the middle part of the valve body 1. The valve body 1, the valve core 3 and the lower side of the first baffle plate 5 cooperate to form a first cavity, which is used to allow the liquid discharged from the plunger pump to pass through. The first cavity is connected to the overflow outlet 102. The round rod portion of the valve core 3 is provided with a sliding member 6, and the sliding member 6 is slidably connected to the valve body 1. The first baffle plate 5 and the sliding member 6 are both penetrated by the valve core 3. The first baffle plate 5 is slidably connected to the valve core 3. The valve body 1, the valve core 3, the first baffle plate 5 and the sliding member 6 cooperate to form a second cavity. When the valve core 3 moves, the sliding member 6 is driven to move, so that the second cavity inhales or discharges liquid. The two cavities and the first sealing member 4 are both filled with liquid, which is used for transmission and may be hydraulic oil, etc. The valve body 1 is provided with a third channel 105, which connects the first channel 103 with the second cavity. The valve core 3 is composed of a frustum portion on the lower side, a round rod portion in the middle and a disc portion on the upper side. The maximum diameter of the frustum portion of the valve core 3 is smaller than the diameter of the first cavity, so that the liquid discharged from the plunger pump can smoothly enter the first cavity. The frustum portion of the valve core 3 is provided with an annular groove for increasing the contact area between the valve core 3 and the first sealing member 4, thereby improving the sealing effect between the valve core 3 and the first sealing member 4.

[0027] When using the device, first adjust the initial compression amount of the spring between the adjusting bolt 2 and the valve core 3 by turning the adjusting bolt 2, so as to change the pressure required to release the seal of the valve core 3, and then connect the overflow inlet 101 of the device with the plunger pump, and the liquid in the plunger pump enters the overflow inlet 101. When the liquid pressure in the plunger pump is greater than the elastic force of the spring adjacent to the valve core 3, the liquid in the plunger pump pushes the valve core 3, so that the valve core 3 moves upward and compresses the adjacent spring, and a gap is generated between the truncated cone portion of the valve core 3 and the valve body 1. The liquid with excessive pressure in the plunger pump enters the first cavity through the gap and is then discharged from the overflow outlet 102. When the valve core 3 moves upward, the valve core 3 drives the sliding member 6 to move upward. When the sliding member 6 moves upward, the volume of the second cavity increases to generate negative pressure, which pushes the liquid in the first sealing member 4 through the second channel 104. , the first channel 103 and the third channel 105 are sucked into the second cavity, the liquid in the first sealing member 4 is reduced, and the first sealing member 4 contracts under the action of its own elasticity, thereby reducing the obstruction of the first sealing member 4 to the gap between the valve core 3 and the valve body 1, reducing the probability of liquid cavitation, and then reducing the occurrence of cavitation, extending the service life of the device, and at the same time reducing the contact area between the first sealing member 4 and the rapidly flowing liquid, reducing the impact on the first sealing member 4 when the liquid flows out rapidly, and extending the service life of the first sealing member 4. When the liquid pressure in the plunger pump returns to normal, the valve core 3 is reset under the action of the adjacent spring. While the valve core 3 is reset, it drives the sliding member 6 to move downward and reset. The sliding member 6 presses the liquid in the second cavity back into the first sealing member 4, causing the first sealing member 4 to expand and form a seal with the adjacent annular groove on the valve core 3.

[0028] When the sealing ring in the existing overflow valve is damaged, the plunger pump will immediately stop working, affecting the normal progress of the project.

[0029] Example 2: Based on Example 1, Figure 2-Figure 4 As shown, it also includes a second seal 7, the second seal 7 is provided with a cavity, the second seal 7 is made of elastic material, the second seal 7 is used to play a temporary sealing role when the seal 4 is damaged, the second seal 7 is fixed in the valve body 1, the second seal 7 is located on the upper side of the first seal 4, the second seal 7 is initially in a contracted state, and is used to avoid the impact of liquid and the friction of the valve core 3, so that the second seal 7 can work normally when the first seal 4 is damaged, the second seal 7 is sealed with the valve core 3, and the valve body 1 is provided with a fourth channel 106, and the fourth channel 106 connects the first channel 103 and the second seal 7.

[0030] Combination Figure 4 and Figure 5As shown, a first gate 8 is slidably connected inside the valve body 1, and a spring is provided between the first gate 8 and the valve body 1. The spring is initially in a compressed state and is used to move the first gate 8 to the left to block the first channel 103. The first gate 8 cooperates with the first channel 103 in blocking.

[0031] Combination Figure 4 and Figure 5 As shown, a sliding rod 9 is slidably connected in the valve body 1, and a second gate 10 slidably connected to the valve body 1 is fixedly connected to the sliding rod 9. A tension spring is arranged between the lower side of the second gate 10 and the valve body 1. The tension spring is initially in a stretched state, and is used to move the second gate 10 downward to release the blockage of the fourth channel 106. At the same time, the tension spring is also used to provide the sliding rod 9 with the force required to limit the first gate 8. The first gate 8 is provided with a groove that cooperates with the sliding rod 9 to limit. Under the joint action of the liquid pressure in the first channel 103 and the limiting force of the sliding rod 9, the first gate 8 offsets the force generated by the spring adjacent to the first gate 8. When the liquid pressure in the first channel 103 decreases, the limiting force of the sliding rod 9 can no longer maintain the current position of the first gate 8, and the second gate 10 cooperates with the blocking of the fourth channel 106.

[0032] Combination Figure 2 and Figure 3 As shown, the sliding member 6 is slidably connected with a limit post 11, and a tension spring is arranged between the limit post 11 and the sliding member 6. The tension spring is initially in a stretched state and is used to move the sliding member 6 to the left to release the connection between the sliding member 6 and the valve core 3. The sliding member 6 is connected to the first channel 103 through a hose. When the pressure in the first channel 103 decreases, the sliding member 6 moves under the action of the adjacent tension spring. The valve core 3 is provided with two limit grooves evenly distributed up and down. The limit post 11 is limitedly matched with the adjacent limit grooves on the valve core 3. The right side of the limit post 11 An annular inclined surface is arranged on the side to facilitate the insertion of the limit column 11 into the adjacent limit groove on the valve core 3. A second baffle 12 is fixedly connected to the valve body 1. The second baffle 12 is located above the sliding member 6. The sliding member 6 is slidably connected to the valve core 3. Three springs evenly distributed circumferentially are arranged between the second baffle 12 and the sliding member 6. The springs are initially in a compressed state. When the limit column 11 releases the connection between the sliding member 6 and the valve core 3, the sliding member 6 moves downward under the action of the three springs, pressing the liquid in the second cavity into the second sealing member 7.

[0033] When the first sealing member 4 is damaged, the liquid in the first sealing member 4 leaks, and the liquid in the first channel 103 enters the first sealing member 4 through the second channel 104, and then leaks from the damaged part of the first sealing member 4, so that the pressure of the liquid in the first channel 103 is reduced. At this time, the first gate 8 moves to the left under the action of the adjacent spring, and squeezes the sliding rod 9 when the first gate 8 moves, so that the sliding rod 9 drives the second gate 10 to move upward, and the second gate 10 stretches the adjacent tension spring. When the first gate 8 moves to block the first channel 103, the first gate 8 is separated from the sliding rod 9, and the second gate 10 drives the sliding rod 9 to continue to move downward under the action of the adjacent tension spring, so that the second gate 10 releases the blockage of the fourth channel 106. At the same time as the liquid pressure in the first channel 103 is reduced, because the first channel 103 is connected to the sliding member 6 through the hose, the liquid pressure in the sliding member 6 is reduced, and the limiting column 11 moves to the left under the action of the adjacent tension spring. When the limiting column 11 is separated from the adjacent limiting groove on the valve core 3, the limiting column 11 is separated from the adjacent limiting groove on the valve core 3. When the valve is released, the sliding member 6 moves downward under the action of the three adjacent springs, and the sliding member 6 drives the limiting column 11 to move downward. At the same time, when the sliding member 6 moves downward, the volume of the second cavity becomes smaller, so that the liquid in the second cavity is pressed into the first channel 103 through the third channel 105, and the liquid enters the second sealing member 7 through the fourth channel 106. The liquid in the second sealing member 7 increases and expands, and the second sealing member 7 fits with the adjacent annular groove on the valve core 3, so that the second sealing member 7 temporarily replaces the first sealing member 4 for sealing to prevent the normal operation of the plunger pump from being affected by damage to the first sealing member 4. At the same time, the limiting column 11 is aligned with the limiting groove on the lower side of the valve core 3, and the liquid pressure in the first channel 103 returns to normal. The liquid enters the sliding member 6 through the hose, pushing the limiting column 11 to move rightward and stretching the adjacent tension spring. The limiting column 11 is inserted into the limiting groove on the lower side of the valve core 3, so that the valve core 3 and the sliding member 6 are re-fixed to restore the function of the device. After that, when the plunger pump is idle, the device can be removed and replaced with a new one.

[0034] The present invention provides a thought and method. There are many methods and ways to implement the technical solution. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A relief valve structure for a plunger pump, comprising a valve body (1), one side of the valve body (1) being threadedly connected to an adjusting bolt (2), a valve core (3) being slidably connected inside the valve body (1), a spring being arranged between the valve core (3) and the adjusting bolt (2), an overflow inlet (101) being arranged on a side of the valve body (1) away from the adjusting bolt (2), the valve core (3) being sealed and matched with the overflow inlet (101), an overflow outlet (102) being arranged on a position of the valve body (1) close to the overflow inlet (101), characterized in that: The valve body (1) further comprises a first sealing member (4), wherein the first sealing member (4) is provided with a cavity, a first channel (103) is provided on a side of the valve body (1) away from the overflow outlet (102), the first sealing member (4) is fixedly connected to the valve body (1), and the first sealing member (4) and the valve core (3) are in sealing cooperation; A second channel (104) is provided on a side of the valve body (1) close to the first sealing member (4), the second channel (104) being in communication with the first channel (103), the second channel (104) being in communication with the first sealing member (4), a first baffle (5) being fixedly connected to the inside of the valve body (1), the valve body (1), the valve core (3) and a side of the first baffle (5) close to the overflow inlet (101) cooperating to form a first cavity, the first cavity being in communication with the overflow outlet (102), The valve core (3) is provided with a sliding member (6), the sliding member (6) is slidably connected to the valve body (1), the first baffle plate (5) is slidably connected to the valve core (3), the valve body (1), the valve core (3), the first baffle plate (5) and the sliding member (6) cooperate to form a second cavity, the second cavity and the first sealing member (4) are both filled with liquid, the valve body (1) is provided with a third channel (105), the third channel (105) connects the first channel (103) with the second cavity; The valve body (1) further comprises a second sealing member (7), wherein the second sealing member (7) is provided with a cavity, the second sealing member (7) is fixedly connected to the valve body (1), the second sealing member (7) is located on a side of the first sealing member (4) away from the overflow inlet (101), the second sealing member (7) is in sealing cooperation with the valve core (3), the valve body (1) is provided with a fourth channel (106), and the fourth channel (106) connects the first channel (103) and the second sealing member (7); A first gate (8) is slidably connected inside the valve body (1), a spring is provided between the first gate (8) and the valve body (1), and the first gate (8) cooperates with the first passage (103) to block; A sliding rod (9) is slidably connected inside the valve body (1), a second gate (10) slidably connected to the valve body (1) is fixedly connected to the sliding rod (9), a tension spring is arranged between the side of the second gate (10) close to the sliding rod (9) and the valve body (1), and the first gate (8) is provided with a groove that cooperates with the sliding rod (9) to limit the position; The second gate (10) cooperates with the fourth channel (106) to block; The sliding member (6) is slidably connected to a limiting column (11), a tension spring is provided between the limiting column (11) and the sliding member (6), the sliding member (6) is connected to the first channel (103) via a hose, the valve core (3) is provided with evenly distributed limiting grooves, the limiting column (11) is limitedly matched with adjacent limiting grooves on the valve core (3), a second baffle (12) is fixedly connected to the valve body (1), the sliding member (6) is slidably connected to the valve core (3), and a circumferentially evenly distributed spring is provided between the second baffle (12) and the sliding member (6).

2. The overflow valve structure for a plunger pump according to claim 1, characterized in that: The valve core (3) is composed of a truncated cone portion, a round rod portion and a disc portion, and the maximum diameter of the truncated cone portion of the valve core (3) is smaller than the diameter of the first cavity.

3. The overflow valve structure for a plunger pump according to claim 2, characterized in that: The truncated cone portion of the valve core (3) is provided with an annular groove, which is used to increase the contact area between the valve core (3) and the first sealing member (4).

4. The overflow valve structure for a plunger pump according to claim 1, characterized in that: An annular inclined surface is provided on one side of the limiting column (11) close to the valve core (3), for enabling the limiting column (11) to be inserted into an adjacent limiting groove on the valve core (3).

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