Air channel arrangement structure of wheel cylinder

Abstract

The utility model discloses a wheel cylinder air passage arrangement structure which comprises a pump shell, an air cavity, a liquid cavity, an air inlet passage and a liquid inlet passage are arranged in the pump shell, the air inlet passage is located behind the air cavity and is parallel to the liquid cavity, the liquid inlet passage is horizontally perpendicular to the air inlet passage and is respectively intersected with the air inlet passage and the liquid cavity, and the liquid inlet passage is communicated with the liquid cavity. An air inlet channel liquid inlet hole located in the front end of the air inlet channel and a liquid cavity liquid inlet hole entering the liquid cavity are formed, and an inner air channel communicating with the air cavity from the air inlet channel is further formed in the pump shell. By the adoption of the air passage arrangement structure, the wheel cylinder has the advantage of being suitable for being installed at a plurality of positions around the gearbox.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile clutch operation, and relates to a clutch slave cylinder, in particular to an airway arrangement structure of the clutch slave cylinder. Background Art

[0002] The clutch slave cylinder (short for slave cylinder) is an important component of the automobile clutch operating mechanism. Its function is to control the engagement and disengagement of the clutch, thereby cutting off or transmitting the power output of the engine.

[0003] like Figure 1 As shown, the air inlet duct 410 of the existing slave pump is arranged to form a certain angle with the liquid cavity 120, thereby making the air valve assembly 10 and the hydraulic assembly 20 have a V-shaped structure. Therefore, this slave pump is called a V-type structure slave pump. Although this V-type structure slave pump has the advantage of simplifying the internal gas channel and liquid channel, its application occasions are strictly limited. Since its air inlet duct 410 is tilted upward and requires an external high-pressure air source, this V-type structure slave pump can only be installed on the side of the gearbox and cannot be installed below the bottom of the gearbox. However, some current vehicle manufacturers need to install the slave pump on the side of the gearbox, while others need to install the slave pump below the bottom of the gearbox. Therefore, for the applicant, it is necessary to develop a slave pump that can be installed on the side of the gearbox and below the bottom of the gearbox. For this purpose, the air duct of the slave pump needs to be rearranged. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a slave pump air duct arrangement structure, wherein the slave pump adopting the air duct arrangement structure can be adapted to be installed in multiple positions around the gearbox, thereby overcoming the shortcomings of the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The lip seal of the pump is sealed with a sealant on the front of the pump, and the sealant is sealed with a sealant on the back of the pump, the sealant is sealed with a sealant on the back of the pump, and the sealant is sealed with a sealant on the back of the pump, the sealant is sealed with a sealant on the back of the pump, and the sealant is sealed with a sealant on the back of the pump,

[0007] With this structure, since the air inlet duct is arranged parallel to the liquid cavity, it will not tilt upward. Even if it is installed below the bottom of the gearbox, it will not affect the external high-pressure air source. It can be installed in multiple positions around the gearbox.

[0008] In the present invention, the air inlet interface of the air inlet duct is perpendicular to the air inlet duct, which can further realize the external connection of the high-pressure air source to the side of the sub-pump.

[0009] In the present invention, the fluid inlet is located at the top of the fluid chamber. This ensures that when the brake fluid is discharged, no gas remains at the top of the fluid chamber, thus preventing the residual gas from affecting the piston rod stroke. This ensures accurate drive control of the slave cylinder and complete clutch disengagement.

[0010] In the present invention, a first sealing ring is provided at the front end of the liquid chamber to seal the gap between the piston rod and the liquid chamber. The liquid chamber inlet is located behind and adjacent to the first sealing ring, and a sealing support groove is provided on the end surface of the first sealing ring facing the liquid chamber inlet. With this structure, brake fluid entering the liquid chamber can quickly reach the first sealing ring, opening the sealing support groove, thereby squeezing the inner and outer sealing lips of the first sealing ring into close contact with the cylindrical surface of the piston rod and the inner wall of the liquid chamber, respectively, thereby achieving a sealing effect. The higher the brake fluid pressure in the liquid chamber, the better the sealing effect.

[0011] In the present invention, a second sealing ring is further provided at the front end of the liquid chamber, located in front of the first sealing ring, to seal the gap between the piston rod and the liquid chamber. The second sealing ring has a sealing support groove on its end surface facing the air chamber. Thus, when compressed air enters the air chamber, it fills the sealing support groove of the second sealing ring from the air chamber side, thereby squeezing the inner and outer sealing lips of the second sealing ring into close contact with the cylindrical surface of the piston rod and the inner wall of the liquid chamber, respectively. This, in conjunction with the first sealing ring, provides a secondary seal. Furthermore, the higher the gas pressure within the air chamber, the better the sealing effect.

[0012] In the present invention, a gap is defined between the first and second sealing rings. During the reciprocating motion of the piston rod, the sealing action of the first and second sealing rings creates a closed area within the gap, generating back pressure and causing unsteady movement of the piston rod. To prevent this, a vent is provided within the pump housing, connecting the gap to the outside.

[0013] In the present invention, the top of the liquid chamber has a guide groove extending from the liquid chamber inlet to the first sealing ring. The guide groove can further guide the rapid flow entering the liquid chamber to the first sealing ring.

[0014] In the present invention, a guide sleeve is fixed within the liquid chamber to fill the gap between the piston rod and the liquid chamber. By filling the gap between the piston rod and the liquid chamber, the guide sleeve guides the movement of the piston rod within the liquid chamber, preventing the piston rod from bouncing during axial movement within the liquid chamber and ensuring smooth axial movement of the piston rod.

[0015] In the present invention, a push rod is connected to the front end of the piston rod. The front end of the piston rod has a ball socket, and the rear end of the push rod has a ball head. The ball head is secured in the ball socket by an elastic clamp, with the large end of the elastic clamp engaging the wall of the ball socket and the small end engaging the ball head. This fixing method does not restrict the ball head from rotating in the ball socket, thereby allowing the push rod to swing appropriately when transmitting force outward.

[0016] With this technical solution, the intake duct is parallel to the liquid chamber and does not tilt upward, allowing the slave cylinder to be placed in multiple locations around the transmission. Therefore, the utility model has the advantages of being adaptable to installation in multiple locations around the transmission, as well as providing a good piston rod seal and allowing the air in the liquid chamber to be completely exhausted during the piston rod's return stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 This is a cross-sectional diagram of a V-shaped slave pump in the prior art;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the slave pump of the present utility model;

[0020] Figure 3 This is a front view of the slave pump of the present utility model;

[0021] Figure 4 It is a rear view of the slave pump of the present utility model;

[0022] Figure 5 for Figure 4 Middle AA section view;

[0023] Figure 6 for Figure 4 Middle CC section view;

[0024] Figure 6A for Figure 6 An enlarged view of the air valve in FIG.

[0025] Figure 7 for Figure 4 Middle DD section view;

[0026] Figure 7A for Figure 7 Enlarged view of point E in the middle;

[0027] Figure 7B for Figure 7 Enlarged view of point F in the middle;

[0028] Figure 7C for Figure 7 Enlarged view of point G in the middle;

[0029] Figure 8 for Figure 4 A cross-sectional view in the HH direction in the intake state;

[0030] Figure 8A for Figure 8 Enlarged view at point I in the middle;

[0031] Figure 9 for Figure 4 A cross-sectional view of the exhaust body taken along the HH axis;

[0032] Figure 9A for Figure 9 Enlarged view of J in the middle;

[0033] Figure 10 for Figure 4 Middle KK section view;

[0034] Figure 10A for Figure 10 Enlarged view of L in the middle;

[0035] Figure 11 for Figure 3 Middle BB section view;

[0036] Figure 12 This is a schematic diagram of the slave cylinder of the present invention being arranged next to the gearbox. DETAILED DESCRIPTION

[0037] like Figures 2 to 6 , combined Figure 7 、 Figure 11 As shown, the sub-pump air passage arrangement structure of the present invention includes a pump housing 100 , and the pump housing 100 has an air cavity 110 , a liquid cavity 120 , an air inlet passage 410 and a liquid inlet passage 420 therein.

[0038] The liquid cavity 120 is located at the rear of the air cavity 110. The liquid cavity 120 and the air cavity 110 are connected and arranged coaxially. The cross-sectional area of the air cavity 110 is larger than the cross-sectional area of the liquid cavity 120. A cover plate 111 is installed at the front opening of the air cavity 110.

[0039] A piston rod 210 is provided in the liquid chamber 120, the front end of which extends to the air chamber 110. A piston disc 220 is provided in the air chamber 110 and is fixed to the front end of the piston rod 210. A return spring 230 is provided between the piston disc 220 and the rear wall of the air chamber 110.

[0040] Combine Figure 7A As shown, there is a gap between the piston rod 210 and the inner wall of the liquid chamber 120. A sealing assembly 130 is provided in the liquid chamber 120 near the front end of the air chamber 11. A guide sleeve 121 is fixed to the liquid chamber 120 behind the sealing assembly 130. The piston rod 210 is provided in the liquid chamber 120 and passes through the guide sleeve 121 and the sealing assembly 130 in sequence and extends into the air chamber 110. The guide sleeve 121 is used to fill the gap between the piston rod 210 and the liquid chamber 120, guides the movement of the piston rod 210 in the liquid chamber 120, avoids the piston rod 210 from jumping when it moves axially in the liquid chamber 120, and ensures the smooth axial movement of the piston rod 210.

[0041] The sealing assembly 130 is arranged between the liquid chamber 120 and the piston rod 210, and is composed of a first sealing ring 131, a first retaining ring 132, a first retaining spring 133, a second retaining ring 134, a second sealing ring 135, a third retaining ring 136 and a second retaining spring 137 from back to front.

[0042] The front end of the liquid chamber 120 has a stop step 120a near the guide sleeve 121, a first retaining groove 120b in the middle, and a second retaining groove 120c near the liquid chamber outlet. A first retaining spring 133 is embedded in the first retaining groove 120b, and a second retaining spring 137 is embedded in the second retaining groove 120c. A first retaining ring 132 and a second retaining ring 134 are disposed on the front and rear sides of the first retaining spring 133, respectively. A third retaining ring 136 is disposed on the rear side of the second retaining ring 137. A first sealing ring 132 is secured between the stop step 120a and the first retaining ring 132, and a second sealing ring 135 is secured between the second retaining ring 134 and the third retaining ring 136.

[0043] In this embodiment, the first sealing ring 131 has a sealing support groove 130a on its end surface facing the rear of the liquid chamber 120. The second sealing ring 135 also has a sealing support groove 130a on its end surface facing the air chamber 110. This arrangement offers the advantage that, upon entry of brake fluid into the liquid chamber 120, the pressured brake fluid quickly and immediately fills the sealing support groove 130a of the first sealing ring 131, thereby forcing the inner and outer sealing lips of the first sealing ring 131 to adhere tightly to the cylindrical surface of the piston rod 210 and the inner wall of the liquid chamber 120, respectively, thereby achieving a sealing effect. Furthermore, the higher the brake fluid pressure within the liquid chamber 120, the better the sealing effect. Similarly, when compressed air enters the air cavity 110, the compressed air will fill into the sealing expansion groove 130a of the second sealing ring 135 from the side of the air cavity 100, and then squeeze the inner and outer sealing lips of the second sealing ring 135 to fit tightly with the cylindrical surface of the piston rod 210 and the inner wall of the liquid cavity 120 respectively, cooperating with the first sealing ring to play a secondary sealing role, and the higher the gas pressure in the air cavity 110, the better the sealing effect.

[0044] A gap 122 is defined between the first sealing ring 131 and the second sealing ring 135. During the reciprocating motion of the piston rod 210, the sealing effect of the first and second sealing rings 131, 135 creates a sealed area within this gap, generating back pressure and causing the piston rod 210 to move unsteadily. To prevent this, the pump housing 100 includes a vent 120e connecting this sealed area 122 to the outside world.

[0045] Combine Figure 7C As shown, the circumferential surface of the piston disc 220 is provided with a first groove 221 and a third sealing ring 141 disposed within the first groove 221. The third sealing ring 141 is used to seal the piston disc 220 against the circumferential inner wall of the air cavity 110. The sealing support groove 130a of the third sealing ring 141 faces the rear of the air cavity 110. This allows compressed air entering the air cavity 110 to flow into the sealing support groove 130a of the third sealing ring 141, thereby forcing the inner and outer sealing lips of the third sealing ring 141 into close contact with the circumferential surface of the piston disc 220 and the inner wall of the air cavity 110, respectively, thereby achieving a sealing effect. Furthermore, the circumferential surface of the piston disc 220 is provided with a second groove 222, located forward of the first groove 221. A guide ring 142 is disposed within the second groove 222. The gap between the guide ring 142 and the air cavity 110 is very small, ensuring smooth movement of the piston disc 220 within the air cavity 110.

[0046] Combine Figure 7BAs shown, the front end face of the piston rod 210 is also provided with a ball socket 211. The push rod 300 passes through the cover plate 111, and its rear end has a semicircular ball head 301. The ball head 301 is installed in the ball socket 211 and is fixed by an elastic clip 302. The elastic clip 302 is a conical tubular structure that allows the ball head 301 to pass through. Its large end 302a is stuck on the hole wall of the ball socket 311, and the small end 302b is stuck on the ball head 301, fixing the ball head 301 to prevent the ball head 301 from falling out of the ball socket. In addition, this fixing method will not limit the rotation of the ball head 301 in the ball socket 211, thereby allowing the push rod 300 to swing appropriately when transmitting force outward.

[0047] For example Figure 7 and Figure 8 As shown, one end of return spring 230 abuts against a positioning groove 231 on the inner surface of piston plate 220, while the other end abuts against the rear wall of air chamber 110 and is positioned by a raised platform 232 protruding from the rear wall and surrounding the fluid chamber. The function of return spring 230 is to balance the reaction force of the clutch pressure plate when there is no compressed air in air chamber 110 and no brake fluid in fluid chamber 120, allowing piston plate 220 to return to its initial position in air chamber 110.

[0048] Combine Figure 2 、 Figure 7 and Figure 11 As shown, the air inlet 410 is arranged parallel to the liquid chamber 120. Figure 6A As shown, the air valve 400 is installed in the air inlet duct 410 and includes a valve seat 401 , a sealing plug 402 , a cylinder 403 , a first spring 404 , a valve core 406 , a second spring 407 and a cover 408 .

[0049] Recombination Figure 8 and Figure 8AAs shown, the valve seat 401 and the cylinder 403 are fixed in the air inlet duct 410 by the compression of the sealing cover 408. The valve seat 401 divides the air inlet duct 410 into a front chamber 410a and a rear chamber 410b. The sealing plug 402 is located in the rear chamber 410b, and its plug portion initially seals the valve seat opening 401a of the valve seat 401. The cylinder 403 is located behind the sealing plug 402. The plunger portion of the sealing plug 402 is located in the cylinder 403, and the two are sealed by a fourth sealing ring 403a. The sealing plug 402 can move axially forward and backward under the guidance of the cylinder 403. The first spring 404 is mounted on the cylinder 403 and is located between the flange at the rear end of the cylinder 403 and the plug portion of the sealing plug 402. The valve core 406 is arranged in the front cavity 410a, and the rear end of the valve core 406 has a head 406a that can pass through the valve seat opening 401a, and the second spring 407 is arranged between the valve seat 401 and the valve core 406. Under the elastic action of the second spring 407, in the initial state, there is a gap between the valve core 406 and the valve seat 401. The valve core 406 has an air passage 406b extending from the rear end face of the head 406a to the interior and a lateral air passage 406c connected from the air passage 406b to the side surface of the valve core 406. The position corresponding to the lateral air passage 406c in the front cavity 410a is provided with an exhaust channel 411a connected to the outside. The valve core 406 is provided with a fifth sealing ring 406d (such as Figure 6A A sealing gasket 402a is provided on the front end of the plug portion of the sealing plug 402, which provides a seal when in contact with the valve seat opening 401a of the valve seat 401 or the head portion 406a of the valve core 406. A fourth sealing ring 403a is provided on the circumferential surface of the plunger portion of the sealing plug 401.

[0050] Combined with Figure 2 As shown, the rear end of the air inlet 410 has an air inlet interface 405 that is horizontal and perpendicular to the air inlet 410. The air inlet interface 405 is connected to the rear cavity 410b. The air inlet interface 405 is used to connect to a high-pressure air source.

[0051] Combine Figure 2 、 Figure 10 and Figure 10A As shown, an air hole 411 b is provided in the front cavity 410 a near the valve seat 401 , and an internal air passage 411 extending from the air hole 411 b to the rear wall of the air cavity 110 is provided in the pump housing 100 .

[0052] Combine Figure 2 and Figure 11 As shown, the pump housing 100 also has a liquid inlet 420. The liquid inlet 420 is horizontally perpendicular to the air inlet 410 and intersects with the air inlet 410 and the liquid cavity 120, respectively, and then forms an air inlet liquid inlet hole 421 (as shown in FIG. Figure 6AAs shown in FIG), a liquid inlet hole 422 is formed at the top of the liquid cavity 120 near the guide sleeve 121 (as shown in FIG). Figure 7A shown).

[0053] For example Figure 6A As shown, a blocking step 410c is provided in the middle of the front chamber 410a to prevent the valve core 406 from moving to the bottom of the front end of the front chamber 410a. Thus, with the blocking step 410 preventing the valve core 406 from moving to the bottom of the front end of the front chamber 410a, a gap always exists between the front end of the valve core 406 and the bottom of the front chamber 410a when the valve core 406 is in the initial state. This gap allows brake fluid to smoothly enter the front chamber 410a from the intake port 421.

[0054] When the driver steps on the clutch pedal, the clutch pedal will control the main pump in the vehicle clutch system to output brake fluid. The brake fluid enters the front cavity 410a of the intake duct 410 through the intake duct liquid inlet hole 421 through the liquid inlet channel 420 and enters the liquid cavity 120 through the liquid cavity liquid inlet hole 422.

[0055] When the brake fluid enters the front chamber 410a of the intake passage 410, it drives the valve core 406 to push open the sealing plug 402, separate it from the valve seat 401, and open the valve seat port 401a, so that the rear chamber 410b and the front chamber 410a are connected. At this time, the compressed air in the rear chamber 410b enters the front chamber 410a through the valve seat port 410b, and enters the air chamber 110 from the air hole 411b through the internal air passage 411 (that is, at this time, the intake interface 405, the rear chamber 410b, the valve seat port 401a of the valve seat 401, the front chamber 410a, the air hole 411, and the internal air passage 411 connected in sequence form an intake passage, as shown in FIG. Figure 8A and Figure 10A As shown by the middle arrow, the piston disc 220 in the air chamber 110, under the action of the compressed air, and the piston rod 110 in the liquid chamber 120, under the action of the brake fluid, move forward together, driving the push rod 300 forward, thereby driving the pressure plate and driven plate of the external clutch to separate. As the valve core 406 pushes open the sealing plug 402, the sealing plug 402 simultaneously blocks the opening of the central air passage 406b, preventing the compressed air that has flowed into the front chamber 410a from leaking out of the central air passage 406b.

[0056] When the driver releases the clutch pedal, the clutch pedal no longer controls the master pump's output of brake fluid to the slave pump, and the brake fluid in both the front chamber 410a and the fluid chamber 120 loses pressure. Consequently, the valve core 406 in the intake duct 410, under the action of the second spring 407, returns to its initial position. The sealing plug 402, under the action of the first spring 404, returns to the initial sealing position of the valve seat opening 401a of the valve seat 401, thus severing the connection between the rear chamber 410b and the front chamber 410a. Simultaneously, the push rod 300, under the reaction force of the clutch pressure plate, drives the piston rod 210 and piston plate 220 back together. During the retraction process, the piston rod 210 discharges the brake fluid in the liquid chamber from the liquid chamber inlet hole 422 via the liquid inlet channel 420 back to the main pump, and the piston plate 220 discharges the gas in the air chamber 110 through the internal air channel 411, the air hole 411b, the gap between the valve core 406 and the valve seat 401, the middle air channel 406b, the lateral air channel 406c, and the exhaust channel 411a to the outside of the slave pump (that is, at this time, the internal air channel 411, the air hole 411b, the gap between the valve core 406 and the valve seat 401, the middle air channel 406b, the lateral air channel 406c, and the exhaust channel 411a are connected in sequence to form an exhaust channel, as shown in FIG. Figure 9 、 Figure 9A arrows).

[0057] From the above description, it can be seen that the air valve 400 of the utility model can automatically switch between intake and exhaust according to whether brake fluid is introduced, and the switching is fast and reliable without any blowby problem.

[0058] For example Figure 8A As shown, an exhaust hole 402b extending from the rear end face to the front end face is further provided in the sealing plug 402. When the valve core 406 abuts the sealing plug 402, the exhaust hole 402b interfaces with the central air passage 406b, allowing the interior of the cylinder 403 to communicate with the outside via the exhaust hole 402b, the central air passage 406b, the lateral air passage 406c, and the exhaust passage 411a. This solves the problem of back pressure caused by the formation of a closed space inside the cylinder 403 when the sealing plug 402 moves back and forth, thereby preventing the travel of the sealing plug 401 from being affected.

[0059] As shown Figure 7 and Figure 7AAs shown, the liquid chamber inlet hole 422 is located at the top of the liquid chamber 120 and is disposed near the guide sleeve 121, that is, near the first sealing ring 131 of the sealing assembly 130. A guide groove 422a is also disposed at the top of the liquid chamber 120, extending from the liquid chamber inlet hole 422 to the first sealing ring 131. Because the liquid chamber inlet hole 422 is close to the first sealing ring 131 and the guide groove 422a has a diversion function, the brake fluid flowing in through the liquid chamber inlet hole 422 will first and quickly flow to the first sealing ring 131, initially expanding the first sealing ring 131 to quickly seal the piston rod 210 and improve the sealing effect. Setting the liquid inlet hole 422 at the top of the liquid cavity 120 is conducive to the automatic discharge of air in the liquid cavity 120, and has the function of automatic exhaust. There will be no air residue in the liquid cavity. Therefore, when the clutch pedal is stepped on to add brake fluid, there is no air residue area in the liquid cavity that needs to be filled with the added brake fluid first. The brake fluid will directly drive the piston rod, avoiding the influence of the residual air in the liquid cavity on the clutch system stroke, thereby ensuring the accuracy of the slave cylinder transmission control and the complete separation of the clutch.

[0060] The above is the air channel arrangement structure of the slave pump of the present invention. Since the air inlet is parallel to the liquid cavity and does not tilt upward, the slave pump can be arranged at multiple locations beside the gearbox. Figure 12 As shown, the slave pump 001 can be placed in the upper left corner, left side, or bottom of the gearbox 002. Therefore, the utility model has the advantages of being adaptable to multiple locations around the gearbox, and also has the advantages of good piston rod sealing effect and the ability to completely exhaust the air in the liquid chamber during the piston rod return stroke.

Claims

1. A sub-pump airway arrangement structure, comprising a pump housing, wherein the pump housing has an air cavity, a liquid cavity, an air inlet and a liquid inlet, wherein the liquid cavity is located at the rear of the air cavity, the liquid cavity and the air cavity are communicated and coaxially arranged, a piston rod with a front end extending to the air cavity is provided in the liquid cavity, a piston disc fixed to the front end of the piston rod is provided in the air cavity, a return spring is further provided in the air cavity between the piston disc and the rear wall of the air cavity, the front end of the air inlet terminates inside the pump housing, the rear end has an air inlet interface, and an air valve is provided inside, characterized in that: The air inlet duct is located behind the air cavity and parallel to the liquid cavity. The liquid inlet duct is horizontally and perpendicularly to the air inlet duct, and intersects with the air inlet duct and the liquid cavity respectively, thereby forming an air inlet duct liquid inlet hole located at the front end of the air inlet duct and a liquid cavity liquid inlet hole entering the liquid cavity respectively. The interior of the pump housing also has an internal air duct connected from the air inlet duct to the air cavity.

2. The slave pump airway arrangement structure according to claim 1, characterized in that: The air intake interface of the air intake duct is perpendicular to the air intake duct.

3. The slave pump airway arrangement structure according to claim 1, characterized in that: The liquid inlet hole of the liquid cavity is located at the top of the liquid cavity.

4. The slave pump airway arrangement structure according to claim 1, characterized in that: A first sealing ring is provided at the front end of the liquid chamber to seal the gap between the piston rod and the liquid chamber. The liquid inlet hole of the liquid chamber is located behind and close to the first sealing ring. The first sealing ring has a sealing support groove on the end surface facing the liquid inlet hole of the liquid chamber.

5. The slave pump airway arrangement structure according to claim 4, characterized in that: The front end of the liquid cavity is further provided with a second sealing ring located in front of the first sealing ring for sealing the gap between the piston rod and the liquid cavity. The end surface of the second sealing ring facing the air cavity is provided with a sealing support groove.

6. The slave pump airway arrangement structure according to claim 5, characterized in that: There is a space between the first sealing ring and the second sealing ring, and a ventilation channel communicating with the space and the outside is provided in the pump housing.

7. The slave pump airway arrangement structure according to claim 4, characterized in that: The top of the liquid cavity is provided with a guide groove extending from the liquid inlet hole of the liquid cavity to the first sealing ring.

8. The slave pump airway arrangement structure according to claim 1, characterized in that: A guide sleeve is fixed in the liquid cavity and is used to fill the gap between the piston rod and the liquid cavity.

9. The slave pump airway arrangement structure according to claim 1, characterized in that: A push rod is connected to the front end surface of the piston rod.

10. The slave pump airway arrangement structure according to claim 9, characterized in that: The front end surface of the piston rod has a ball socket, and the rear end of the push rod has a ball head. The ball head is fixed in the ball socket through an elastic clamp. The large end of the elastic clamp is clamped on the inner wall of the ball socket, and the small end is clamped on the ball head.

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