Novel rear cover flush valve structure

Abstract

The utility model provides a novel rear cover flush valve structure, and belongs to the technical field of hydraulic pressure. The rear cover is provided with the slide way comprising the middle adjusting cavity and the spring cavities at the two ends, the two spring cavities are sealed through the adjusting end covers, the movable valve element is installed in the slide way in a sliding mode, the two ends of the movable valve element extend into the spring cavities, and the abutting springs are arranged between the two ends of the movable valve element and the two adjusting end covers. An operator can adjust the acting force, acting on the movable valve element, of the abutting spring through the two adjusting end covers, two adjusting point positions exist, adjustment can still be achieved through the other adjusting end cover after one adjusting end cover is blocked, and the adjusting flexibility is higher; meanwhile, the spring abutting seat is arranged between the abutting spring and the movable valve element, excessive movement of the spring abutting seat can be limited through the limiting blocking edge, the follow-up movable valve element is only subjected to the acting force of one abutting spring after moving by a preset distance, interference factors are fewer, and stability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pressure, in particular to a novel rear cover flushing valve structure. Background Art

[0002] When the hydraulic motor is working, its oil distribution plate moves at high speed in the cylinder body, causing a large amount of heat to be generated between the oil distribution plate and the cylinder body due to high-speed friction. In order to reduce the impact of heat generation, the industry usually installs a flushing valve structure on its housing. The housing cavity is connected through the flushing valve structure, and the oil in the circuit can enter the housing cavity through the flushing valve structure for cooling, thereby reducing the impact of heat generation.

[0003] At present, the existing flushing valve structures on the market are such as a flushing valve disclosed in patent CN101576105A, in which a directional valve cavity, a low-pressure oil channel, a high-pressure oil channel, and a pressure relief valve cavity are provided in the valve block, and a low-pressure oil port, a high-pressure oil port, and a flushing oil port are provided on the surface of the valve block. One end of the low-pressure oil channel is connected to the directional valve cavity, and the other end is connected to the low-pressure oil port. One end of the high-pressure oil channel is connected to the directional valve cavity, and the other end is connected to the high-pressure oil port. One end of the pressure relief valve cavity is connected to the directional valve cavity, and the other end is connected to the high-pressure oil port. One end of the pressure relief valve cavity is also connected to the directional valve cavity, and the other end is a pressure relief valve port linearly connected to the outside of the valve block. The flushing oil port is also connected to the pressure relief valve cavity. The directional valve core is arranged in the directional valve cavity. The directional valve core divides the directional valve chamber into a low-pressure oil chamber, a movable oil chamber and a high-pressure oil chamber in the directional valve chamber. The directional valve core can selectively connect or cut off the low-pressure oil channel and the pressure relief valve chamber when it reciprocates in the directional valve chamber. There are two return springs, which are respectively arranged between the two ends of the directional valve core and the side walls of the directional valve chamber. When in use, the high-pressure oil enters the high-pressure oil chamber of the directional valve chamber from the high-pressure oil port through the high-pressure oil channel, pushing the directional valve core to move to the other side, so that the low-pressure oil channel and the pressure relief valve chamber are connected. At this time, the low-pressure oil enters the pressure relief valve chamber from the low-pressure oil port through the low-pressure oil channel, pushing the pressure relief valve core to connect the flushing oil port and the pressure relief valve chamber, and the low-pressure oil can flow out from the flushing oil port to achieve flushing of the hydraulic motor housing. Although the above structure can meet the flushing requirements of the hydraulic motor, it only presses the return spring at one end against the directional valve cover. If the moving pressure of the directional valve core needs to be adjusted during later use, only the directional valve cover can be adjusted, and the adjustment position is single. If the directional valve cover is blocked after the hydraulic motor is installed in the equipment later, the hydraulic motor needs to be disassembled as a whole for adjustment, which is inconvenient to use. In addition, the return springs both directly press against the end of the directional valve core, so that when the directional valve core moves subsequently, the two return springs will always be mainly used on the directional valve core, causing the directional valve core to always be subjected to the force of the two return springs, and the stability is not high. Summary of the invention

[0004] In view of the above-mentioned problems existing in the prior art, the present invention aims to provide a novel rear cover flushing valve structure, in which adjusting end covers are installed on the rear cover and at both ends of the slideway. At the same time, spring seats are provided on the sliding sleeves at both ends of the moving valve core, and the tightening springs at both ends are respectively arranged between the two spring seats and the corresponding adjusting end covers, so that the force applied by the tightening springs to the moving valve core can be adjusted from both ends of the rear cover, thereby increasing the adjustment parts and avoiding the problem that the hydraulic motor needs to be disassembled as a whole for adjustment after an adjustment part is blocked. At the same time, a spring seat is provided between the tightening spring and the end of the moving valve core, and a limit step can be provided in the slideway to limit the movement of the spring seat, so that the moving valve core is no longer affected by the tightening spring on the corresponding spring seat after moving a predetermined distance, so that the moving valve core is only affected by a single tightening spring at this time, and the stability is higher.

[0005] The specific technical solutions are as follows:

[0006] A novel rear cover flushing valve structure comprises a rear cover, a movable valve core, a tightening spring, an adjusting end cover and a one-way valve. A slideway running through both sides is provided on the rear cover. The movable valve core is slidably installed in the slideway. The tightening spring is installed in the slideway and is located at both ends of the movable valve core. The adjusting end cover seals the end of the slideway. The middle of the slideway is connected with the flushing channel. The one-way valve is arranged in the flushing channel. The structure also comprises a spring seat. The slideway is a through hole running through both sides of the rear cover. The middle of the slideway is an adjusting chamber and both ends are spring chambers. Furthermore, a limiting step is arranged in the slideway and between each spring chamber and the adjusting chamber. The rear cover is provided with a high-pressure oil hole and a low-pressure oil hole connecting the inlet and outlet oil channels. At the same time, the high-pressure oil hole and the low-pressure oil hole are respectively connected to the two ends of the regulating chamber. A connecting groove is provided on the outer wall of the middle part of the movable valve core along its axial direction. The length of the connecting groove is less than the distance between the high-pressure oil hole and the low-pressure oil hole and is greater than the distance between the high-pressure oil hole or the low-pressure oil hole and the flushing channel. The two ends of the movable valve core extend into the two regulating chambers respectively and are both provided with spring seats. At the same time, an adjusting end cover is installed at one end of each spring chamber away from the adjusting chamber, and the ends of the tightening springs installed at the two ends of the movable valve core respectively abut against the corresponding spring seats and the adjusting end cover.

[0007] In the above-mentioned novel rear cover flushing valve structure, each adjusting end cover is threadedly connected to the inner wall of the corresponding spring cavity, and a knob is provided at one end of the adjusting end cover exposed outside the spring cavity.

[0008] The above-mentioned new type of rear cover flushing valve structure, wherein a positioning hole is opened on the end face of one end of the adjusting end cover installed in the spring cavity, and a protruding ring is provided on the side of the spring support close to the adjusting end cover, one end of the tightening spring is inserted into the corresponding positioning hole of the adjusting end cover, and the other end is sleeved on the corresponding ring on the spring support.

[0009] In the above-mentioned novel rear cover flushing valve structure, both ends of the movable valve core are provided with guide columns extending along its axial direction, and the spring support seat is slidably sleeved outside the guide columns at the corresponding ends of the movable valve core.

[0010] In the above-mentioned novel rear cover flushing valve structure, when the movable valve core is installed in the slideway, a gap is provided between the outer wall of the movable valve core and the inner wall of the limiting step.

[0011] In the above-mentioned novel rear cover flushing valve structure, the rear cover is also provided with a first pressure relief channel which is connected to the regulating chamber and the high-pressure oil hole at the same time and is connected to the regulating chamber and the low-pressure oil hole at the same time.

[0012] In the above-mentioned novel rear cover flushing valve structure, a second pressure relief channel connected to the flushing channel is also opened on the rear cover, a one-way valve is installed in the second pressure relief channel, and a plug of the one-way valve extends into the flushing channel.

[0013] The above-mentioned novel rear cover flushing valve structure has an outer edge of an outer wall on a sleeve ring of a spring seat and located at one end close to the regulating end cover and is arranged to protrude outwards, and one end of the spring sleeved on the sleeve ring is clamped on the outer edge of the protrusion.

[0014] The above-mentioned new type of rear cover flushing valve structure, wherein a through inner hole is opened in the center of the spring seat, a guide column is inserted into the inner hole, a collar is arranged outside the hole edge at one end of the inner hole, and at the same time, the diameter of the inner hole is larger than the outer diameter of the guide column, and the hole edge of the end of the inner hole away from the collar is arranged in a trumpet-shaped expansion.

[0015] In the above-mentioned novel rear cover flushing valve structure, the communicating groove is an annular groove arranged around the outside of the movable valve core.

[0016] The positive effects of the above technical solution are:

[0017] The above-mentioned novel rear cover flushing valve structure is characterized in that adjusting end covers are installed on the rear cover and at both ends of the slideway. At the same time, spring seats are slidingly provided on both ends of the moving valve core, and the ends of the clamping springs at both ends of the moving valve core are respectively abutted between the spring seats and the adjusting end covers at the corresponding ends, so that there are at least two positions on the rear cover that can adjust the force applied by the clamping spring to the moving valve core, avoiding the problem that the hydraulic motor needs to be disassembled as a whole for adjustment after an adjusting end cover is blocked later, and the adjustment flexibility is higher. At the same time, the spring seat is used as a bearing structure for the clamping spring to abut on the moving valve core. At the same time, limiting steps are provided at both ends of the slideway where the moving valve core is located. The limiting steps limit the excessive movement of the spring seat, so that the moving valve core is no longer subjected to the force of the clamping spring on the corresponding spring seat after moving a predetermined distance, so that the moving valve core is subsequently only subjected to the action of a single clamping spring, and the stability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of an embodiment of a novel rear cover flushing valve structure of the utility model;

[0019] Figure 2 for Figure 1 Sectional view along line AA;

[0020] Figure 3 for Figure 1 a cross-sectional view along line BB;

[0021] Figure 4 for Figure 3 Sectional view along line CC.

[0022] In the attached drawings: 1. rear cover; 11. slideway; 12. flushing channel; 13. high-pressure oil hole; 14. low-pressure oil hole; 15. first pressure relief channel; 16. second pressure relief channel; 111. regulating chamber; 112. spring chamber; 113. limiting step; 2. movable valve core; 21. connecting groove; 22. guide column; 3. tightening spring; 4. adjusting end cover; 41. knob; 42. positioning hole; 5. one-way valve; 6. spring seat; 61. collar. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments are combined with the attached Figure 1 To Attachment Figure 4 The technical solution provided by the utility model is described in detail, but the following content is not intended to limit the utility model.

[0024] Figure 1 It is a structural diagram of an embodiment of a novel rear cover flushing valve structure of the utility model; Figure 2 for Figure 1 Sectional view along line AA; Figure 3 for Figure 1 a cross-sectional view along line BB; Figure 4 for Figure 3 A cross-sectional view along line CC. Figures 1 to 4 As shown, the novel rear cover flushing valve structure provided in this embodiment includes: a rear cover 1, a movable valve core 2, a retaining spring 3, an adjusting end cover 4, a one-way valve 5 and a spring retaining seat 6.

[0025] Specifically, a slideway 11 running through both sides is provided on the rear cover 1, and the movable valve core 2 is slidably installed in the slideway 11, and the liquid flow in the slideway 11 is controlled by the movable valve core 2 moving in the slideway 11. In addition, the holding spring 3 is installed in the slideway 11 and is located at both ends of the movable valve core 2, that is, the two ends of the movable valve core 2 are respectively supported by the two holding springs 3, which provides support for the movable valve core 2, and also provides pre-pressure for the movement of the movable valve core 2. In addition, the end of the slideway 11 is sealed by the adjusting end cover 4, that is, the end of the slideway 11 is closed by the adjusting end cover 4, ensuring the sealing of the end of the slideway 11. In addition, the middle part of the slideway 11 is connected to the flushing channel 12, so that after the movable valve core 2 moves, the liquid entering the slide can flow into the flushing channel 12, and flow into the shell cavity to be cooled through the flushing channel 12, meeting the flushing requirements. In addition, a one-way valve 5 is provided in the flushing channel 12 so that the liquid flowing from the flushing channel 12 into the housing cavity is restricted by the one-way valve 5, thereby avoiding the backflow of the liquid and providing higher safety assurance.

[0026] Specifically, the slideway 11 is a through hole that passes through both sides of the rear cover 1, which facilitates the processing of the slideway 11. Both ends of the slideway 11 are provided with adjustment end caps 4 and sealed. At the same time, the middle of the slideway 11 is set as an adjustment chamber 111, and both ends of the slideway 11 are set as spring chambers 112, and the spring chambers 112 at both ends are connected with the adjustment chamber 111, which provides conditions for the subsequent movement of the valve core 2 in the slideway 11. In addition, a limiting step 113 is provided in the slideway 11 and between each spring chamber 112 and the adjustment chamber 111. The limiting step 113 is a structure protruding from the inner wall of the slideway 11, which provides conditions for the subsequent restriction of excessive movement of the spring retaining seat 6. At this time, a high-pressure oil hole 13 and a low-pressure oil hole 14 are provided on the rear cover 1 to connect the inlet and outlet oil passages, that is, the liquid in the inlet and outlet oil passages can enter the high-pressure oil hole 13 and the low-pressure oil hole 14 respectively, and at the same time, the high-pressure oil hole 13 and the low-pressure oil hole 14 are connected to the two ends of the regulating chamber 111 respectively, so that the liquid entering the high-pressure oil hole 13 and the low-pressure oil hole 14 can flow to the regulating chamber 111. In addition, a connecting groove 21 is provided on the outer wall of the middle part of the movable valve core 2 along its axial direction, and the length of the connecting groove 21 is less than the distance between the high-pressure oil hole 13 and the low-pressure oil hole 14, and at the same time, the length of the connecting groove 21 is greater than the distance between the high-pressure oil hole 13 or the low-pressure oil hole 14 and the flushing channel 12, so that when the movable valve core 2 moves from the high-pressure oil hole 13 to the low-pressure oil hole 14, the connecting groove 21 can connect the low-pressure oil hole 14 and the flushing channel 12, so that the liquid in the low-pressure oil hole 14 can flow into the flushing channel 12 through the connecting groove 21, meeting the flushing requirements. Preferably, the structures at both ends of the slide 11 are arranged symmetrically, and the structures at both ends of the movable valve core 2 are also arranged symmetrically. At the same time, the high-pressure oil hole 13 and the low-pressure oil hole 14 are also arranged symmetrically on the warm rear cover 1, so that the directions of the low-pressure oil hole 14 and the high-pressure oil hole 13 can be swapped later to achieve the reverse installation of the flushing valve structure of the rear cover 1, which is more convenient for disassembly and assembly. In addition, the two ends of the movable valve core 2 are respectively extended into the two regulating chambers 111 and are both sleeved with spring retaining seats 6, that is, spring retaining seats 6 are installed at both ends of the movable valve core 2 and in each regulating chamber 111, and at the same time, an adjusting end cover 4 is installed at one end of each spring chamber 112 away from the adjusting chamber 111, and the ends of the tightening springs 3 installed at both ends of the movable valve core 2 are respectively pressed against the corresponding spring retaining seats 6 and the adjusting end cover 4, that is, one end of the tightening spring 3 can be supported by the adjusting end cover 4, and the other end is supported by the spring retaining seat 6. It abuts against the end of the movable valve core 2. In the initial state, the movable valve core 2 is elastically supported by two clamping springs 3. When the movable valve core 2 moves, one clamping spring 3 is compressed and the other clamping spring 3 is extended. At this time, the extended clamping spring 3 pushes the spring retaining seat 6 to move toward one side of the regulating chamber 111, and makes the spring retaining seat 6 be supported by its corresponding limiting step 113, so that the extended clamping spring 3 no longer acts on the movable valve core 2, so that the movable valve core 2 is only supported by one clamping spring 3 at this time, and the stability is higher.In addition, when it is necessary to adjust the pre-support force of the clamping spring 3 on the movable valve core 2, the operator can compress or relax the clamping spring 3 by adjusting the adjusting end covers 4 at both ends. This not only realizes the adjustment, but also provides two locations on the rear cover 1 for adjustment, thereby avoiding the problem of the hydraulic motor needing to be completely disassembled for adjustment after one of the adjusting end covers 4 is blocked, and the adjustment flexibility is higher.

[0027] More specifically, each adjustment end cap 4 is threadedly connected to the inner wall of the corresponding spring cavity 112, that is, by twisting the adjustment end cap 4, the length of the adjustment end cap 4 extending into the spring cavity 112 can be adjusted, thereby achieving the purpose of compressing or loosening the spring 3 and meeting the adjustment requirements. In addition, a knob 41 is provided at one end of the adjustment end cap 4 exposed outside the spring cavity 112, which facilitates the operator to twist the adjustment end cap 4 through the knob 41, making it more convenient to use.

[0028] More specifically, a positioning hole 42 is provided on the end face of one end of the adjusting end cover 4 installed in the spring cavity 112, and the positioning hole 42 is a blind hole. At the same time, a protruding ring 61 is provided on the side of the spring seat 6 close to the adjusting end cover 4. When the clamping spring 3 is installed between the adjusting end cover 4 and the corresponding spring seat 6, one end of the clamping spring 3 is inserted into the positioning hole 42 of the corresponding adjusting end cover 4, and the other end is sleeved on the ring 61 on the corresponding spring seat 6. That is, the positioning holes 42 and the ring 61 are used to realize the positioning of the two ends of the clamping spring 3, thereby improving the stability of the installation of the clamping spring 3, achieving higher control accuracy and more reasonable structural design.

[0029] More specifically, both ends of the movable valve core 2 are provided with guide columns 22 extending along the axial direction thereof, and the cross-section of the guide columns 22 is smaller than the end cross-section of the movable valve core 2, so that abutment steps can be formed between the end face of the movable valve core 2 and the guide columns 22. When the spring retaining seat 6 is subsequently slidably sleeved outside the guide columns 22 at the corresponding end of the movable valve core 2, the guide columns 22 can provide guidance for the spring retaining seat 6, and at the same time, the spring retaining seat 6 can contact the end face of the movable valve core 2 and support the movable valve core 2, thereby providing conditions for the clamping spring 3 to stably act on the movable valve core 2.

[0030] More specifically, when the movable valve core 2 is installed in the slide 11, a gap is provided between the outer wall of the movable valve core 2 and the inner wall of the limiting step 113, so that a gap is formed between the movable valve core 2 and the limiting step 113, thereby realizing the connection between the regulating chamber 111 and the spring chambers 112 at both ends, so that the liquid that subsequently enters the regulating chamber 111 from the high-pressure oil hole 13 can enter the spring chamber 112 through the above-mentioned gap, thereby pushing the movable valve core 2 to overcome the elastic force of the clamping spring 3 at the other end and move, thereby realizing the connection between the low-pressure oil hole 14 and the flushing channel 12 and meeting the flushing requirements. It is worth pointing out that when the pressure of the liquid entering the high-pressure oil hole 13 is insufficient, the liquid flowing into the spring chamber 112 cannot push the movable valve core 2 to slide in the slide 11, and the flushing valve cannot be started. When the pressure of the liquid entering the high-pressure oil hole 13 increases and is greater than the elastic force of the pressing spring 3, the liquid flowing into the spring chamber 112 from the above-mentioned notch can push the movable valve core 2 to slide in the slide 11, thereby realizing the connection between the low-pressure oil hole 14 and the flushing channel 12 and meeting the flushing requirements.

[0031] More specifically, a first pressure relief channel 15 is provided on the rear cover 1, which is connected to the regulating chamber 111 and the high-pressure oil hole 13 at the same time. Similarly, a first pressure relief channel 15 is provided on the rear cover 1, which is connected to the regulating chamber 111 and the low-pressure oil hole 14 at the same time. The first pressure relief channel 15 facilitates the processing of the slide 11, the high-pressure oil hole 13 and the low-pressure oil hole 14. At the same time, it also facilitates the pressure relief operation of the corresponding parts such as the high-pressure oil hole 13, the low-pressure oil hole 14 and the slide 11 when the pressure is too high in the future. It has higher safety and can also facilitate the subsequent cleaning of the holes in the entire rear cover 1. In addition, a plugging cover is installed at the mouth of the first pressure relief channel 15 to ensure the sealing performance of the first pressure relief channel 15 under normal conditions and ensure the normal use of the flushing valve.

[0032] More specifically, a second pressure relief channel 16 connected to the flushing channel 12 is also provided on the rear cover 1. At this time, the one-way valve 5 is installed in the second pressure relief channel 16, that is, a fork is formed in the middle of the flushing channel 12 through the second pressure relief channel 16, which provides installation space for the one-way valve 5 and facilitates the disassembly, assembly and adjustment of the one-way valve 5. In addition, when the one-way valve 5 is installed in the second pressure relief channel 16, the plug of the one-way valve 5 extends into the flushing channel 12, and the flushing channel 12 is opened or closed by the action of the plug of the one-way valve 5, that is, when the liquid enters the flushing channel 12 from the regulating chamber 111, the liquid can push the plug to open the flushing channel 12, and vice versa, when the liquid flows in the reverse direction, the plug closes the flushing channel 12, ensuring one-way flushing.

[0033] More specifically, the outer edge of one end of the ring 61 of the spring seat 6 is arranged to protrude outward. At this time, the end of the ring 61 that is arranged to protrude outward is the outer edge of the outer wall of one end close to the adjusting end cover 4, so that the end of the ring 61 close to the adjusting end cover 4 is the large head end, and when one end of the clamping spring 3 is subsequently sleeved on the ring 61, the end of the clamping spring 3 sleeved on the ring 61 is clamped on the outer edge of the protrusion, that is, a clamping edge is formed by the outer edge of the protrusion on the ring 61, which limits the reverse detachment of the clamping spring 3 and improves the reliability of the connection between the clamping spring 3 and the ring 61.

[0034] More specifically, the center of the spring retainer 6 is provided with an inner hole that penetrates through it, that is, when the spring retainer 6 is sleeved on the end of the movable valve core 2, the guide column 22 is penetrated in the inner hole of the spring retainer 6, so that the spring retainer 6 and the movable valve core 2 are sleeved together, which can not only realize the stable installation of the spring retainer 6 on the end of the movable valve core 2, but also enable the spring retainer 6 to move relative to the movable valve core 2, thus avoiding the spring retainer 6 from interfering with the movement of the movable valve core 2 toward the other end, and making the structural design more reasonable. In addition, the collar 61 is arranged outside the hole edge at one end of the inner hole, so that the collar 61 can be arranged coaxially with the guide column 22, thus preventing the force applied by the clamping spring 3 to the movable valve core 2 from being tilted, and achieving higher stability. At the same time, the diameter of the inner hole of the clamping spring 3 is slightly larger than the outer diameter of the guide column 22, so that the clamping spring 3 can slide smoothly on the guide column 22. In addition, the hole along the end of the inner hole away from the setting ring 61 is arranged in a trumpet-shaped expansion, so that the opening of the inner hole of the end where the spring retaining seat 6 is pressed against the end of the movable valve core 2 is enlarged, thereby facilitating the spring retaining seat 6 to be sleeved on the outside of the guide column 22, making assembly more convenient and the structural design more reasonable.

[0035] More specifically, the connecting groove 21 is arranged as an annular groove arranged around the outside of the movable valve core 2, so that the outer periphery of the middle area of ​​the movable valve core 2 is the connecting groove 21, so that no matter whether the movable valve core 2 will rotate circumferentially during use, the connecting groove 21 can ensure the conduction and isolation of the low-pressure oil hole 14 and the flushing channel 12, and has better adaptability and higher reliability.

[0036] The novel rear cover flushing valve structure provided in this embodiment includes a rear cover 1, a movable valve core 2, a pressing spring 3, an adjusting end cover 4, a one-way valve 5 and a spring pressing seat 6; a slideway 11 penetrating at both ends is provided on the rear cover 1, and the slideway 11 is divided into spring chambers 112 at both ends and an adjusting chamber 111 in the middle, and the two spring chambers 112 are sealed by the adjusting end cover 4, the movable valve core 2 is slidably installed in the slideway 11 and both ends extend into the spring chamber 112, and pressing springs 3 are provided between both ends of the movable valve core 2 and the two adjusting end covers 4, so that the operator can adjust the valve core 2 by sliding the slideway 11 through the two ends. The adjusting end cover 4 adjusts the force of the clamping spring 3 acting on the movable valve core 2, and there are two adjusting points, so that after one of the adjusting end covers 4 is blocked, adjustment can still be achieved through the other adjusting end cover 4, and the adjustment flexibility is higher. In addition, a limited stop edge is set between the spring chamber 112 and the adjusting chamber 111, and a spring seat 6 is set between the clamping spring 3 and the movable valve core 2. The excessive movement of the spring seat 6 can be limited by the limited stop edge, so that the movable valve core 2 is only subjected to the force of a clamping spring 3 after moving a predetermined distance, is less affected by interference factors, and has higher stability.

[0037] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel rear cover flushing valve structure, comprising a rear cover, a movable valve core, a tightening spring, an adjusting end cover and a one-way valve, wherein the rear cover is provided with a slideway running through both sides, the movable valve core is slidably installed in the slideway, and the tightening spring is installed in the slideway and located at both ends of the movable valve core, the adjusting end cover seals the end of the slideway, the middle of the slideway is connected to the flushing channel, the one-way valve is arranged in the flushing channel, and the characteristic is that: The cam is provided with a plurality of springs, each of which is provided with a plurality of springs, each of which is provided with a plurality of springs, each of which is provided with a plurality of springs, each of which is provided with a plurality of springs.

2. The novel rear cover flushing valve structure according to claim 1 is characterized in that: Each of the adjusting end covers is threadedly connected to the inner wall of the corresponding spring cavity, and a knob is arranged at one end of the adjusting end cover exposed outside the spring cavity.

3. The novel rear cover flushing valve structure according to claim 1 is characterized in that: The adjusting end cover is installed on the end surface of one end in the spring cavity and is provided with a positioning hole, and the spring retaining seat is provided with a protruding ring on the side close to the adjusting end cover, one end of the tightening spring is inserted into the corresponding positioning hole of the adjusting end cover, and the other end is sleeved on the corresponding ring on the spring retaining seat.

4. The novel rear cover flushing valve structure according to claim 3 is characterized in that: Both ends of the movable valve core are provided with guide columns extending along the axial direction thereof, and the spring support seat is slidably sleeved outside the guide columns at the corresponding ends of the movable valve core.

5. The novel rear cover flushing valve structure according to claim 1 is characterized in that: When the movable valve core is installed in the slideway, a gap is provided between the outer wall of the movable valve core and the inner wall of the limiting step.

6. The novel rear cover flushing valve structure according to claim 1 is characterized in that: The rear cover is also provided with a first pressure relief channel which is connected to the regulating chamber and the high-pressure oil hole at the same time and is connected to the regulating chamber and the low-pressure oil hole at the same time.

7. The novel rear cover flushing valve structure according to claim 1 is characterized in that: The rear cover is also provided with a second pressure relief channel connected to the flushing channel. The one-way valve is installed in the second pressure relief channel, and the plug of the one-way valve extends into the flushing channel.

8. The novel rear cover flushing valve structure according to claim 4 is characterized in that: The outer edge of the outer wall of the spring support seat on the sleeve ring and located at one end close to the regulating end cover is arranged to protrude outwards, and one end of the tightening spring sleeved on the sleeve ring is clamped on the outer edge of the protrusion.

9. The novel rear cover flushing valve structure according to claim 8 is characterized in that: A through inner hole is provided at the center of the spring retaining seat, the guide column is inserted into the inner hole, and the collar is arranged outside the hole edge at one end of the inner hole. At the same time, the diameter of the inner hole is larger than the outer diameter of the guide column, and the hole edge of the inner hole away from the end where the collar is arranged is arranged in a trumpet-shaped expansion.

10. The novel rear cover flushing valve structure according to claim 1 is characterized in that: The communicating groove is an annular groove arranged around the movable valve core.

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