Constant pressure type exhaust valve back pressure detecting device

Abstract

This application relates to the technical field of exhaust valve testing devices, and in particular to a testing device for the back pressure of a constant-pressure exhaust valve. A constant-pressure exhaust valve back pressure testing device includes a main body; the main body also has an air intake channel; it further includes a first rubber sleeve and a second rubber sleeve made of elastic rubber material, with identical structure and arranged in parallel and in the same direction; it also includes test channels, with a first channel, a second channel, a first connecting channel, a second connecting channel, a third channel, and a fourth channel arranged sequentially and serving as components of the test channel. This invention solves the technical problems existing in the prior art, and now provides a constant-pressure exhaust valve back pressure testing device that can seal and connect with the first and second arc-shaped openings of the constant-pressure exhaust valve during the measurement process, improving the accuracy of the measured back pressure results of the constant-pressure exhaust valve.

Description

Technical Field

[0001] This application relates to the field of exhaust valve testing devices, and in particular to a constant pressure exhaust valve back pressure testing device. Background Technology

[0002] With the rapid development of the automotive industry, OEMs are placing increasingly higher demands on automotive parts. The constant pressure exhaust valve is a key functional component for exhausting exhaust gases in commercial vehicles and a tool for controlling the exhaust pressure of the engine braking system, serving as a necessary supplement to vehicle braking. It can be said that the performance of the constant pressure exhaust valve plays a crucial role in the exhaust gas function of the entire vehicle.

[0003] The constant pressure exhaust valve has a constant pressure structure, and the exhaust back pressure must be tested before leaving the factory. Figure 1 , Figure 2 The diagram shows a structural schematic and cross-sectional view of a constant pressure exhaust valve. The constant pressure exhaust valve has a pressure regulating spring and a steel ball inside. The steel ball blocks the working channel of the exhaust valve. The so-called back pressure is the critical gas pressure at which high pressure gas can push the steel ball, so that the steel ball overcomes the pressure of the pressure regulating spring and lifts the pressure regulating spring.

[0004] The current technical challenge lies in the fact that the two ends of the working channel form a first arc-shaped opening and a second arc-shaped opening inside the valve body of the constant pressure exhaust valve, respectively. When using existing tooling to measure the back pressure of the working channel, it often happens that the gas transport channel inside the tooling is difficult to seal and connect with the first arc-shaped opening and the second arc-shaped opening, requiring repeated adjustments by the staff, but still cannot guarantee a good seal. Poor sealing will lead to air leakage at the connection point, affecting the accuracy of the back pressure measurement results of the constant pressure exhaust valve.

[0005] Therefore, the technical problem in the prior art is that there is a need to propose a detection device for the back pressure of a constant pressure exhaust valve, which can be sealed and connected with the first arc-shaped opening and the second arc-shaped opening of the constant pressure exhaust valve during the measurement process, thereby improving the accuracy of the measurement result of the back pressure of the constant pressure exhaust valve. Summary of the Invention

[0006] The purpose of this invention is to provide a device for detecting the back pressure of a constant pressure exhaust valve, addressing the aforementioned deficiencies in the prior art.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] A device for detecting the back pressure of a constant pressure exhaust valve includes a main body. A receiving cavity is provided within the main body, extending along a first straight line. A coaxial piston and a plug are disposed within the receiving cavity. Along the first straight line, the outer circumferential surface of the piston slides in a sealing contact with the inner wall of the receiving cavity, while the outer surface of the plug is fixedly sealed to the inner wall of the receiving cavity. A first gap exists between the piston and the plug along the direction of the first straight line. The main body also includes an air intake channel, with the first gap communicating only with the air intake channel. The main body has a mounting groove and a connecting hole. The mounting groove communicates with the receiving cavity through the connecting hole, and the opening of the mounting groove faces away from the receiving cavity. A connector seat is disposed within the mounting groove, movable along the direction of the first straight line. A connecting portion is provided on the side of the connector seat facing away from the opening of the mounting groove, passing through the connecting hole and connecting to the piston within the receiving cavity. The device includes a first channel, a second channel, a third channel, and a fourth channel. It also includes a first rubber sleeve and a second rubber sleeve made of elastic rubber material, with identical structures and arranged in parallel and oriented in the same direction. Both the first and second rubber sleeves are connected to the surface of the connector seat facing the groove opening. The surfaces of the first and second rubber sleeves facing away from the connector seat are conical or arc-shaped. A first connecting channel is provided inside the first rubber sleeve, and a second connecting channel is provided inside the second rubber sleeve. The first connecting channel forms a first connection port at the end of the first rubber sleeve facing away from the connector seat, and the second connecting channel forms a second connection port at the end of the second rubber sleeve facing away from the connector seat. It also includes a test channel, with the first channel, second channel, first connecting channel, second connecting channel, third channel, and fourth channel arranged sequentially and serving as components of the test channel.

[0009] Furthermore, along the first straight line, the first rubber sleeve is divided into an upper half and a lower half.

[0010] An annular groove is provided on the side surface of the connector seat away from the piston. The lower half of the first rubber sleeve is inserted into the annular groove, and the outer surface of the lower half is interference-fitted with the inner wall of the annular groove.

[0011] The surface of the first rubber sleeve that faces away from the piston, that is, the surface of the upper half that faces away from the lower half, is a conical or arc-shaped surface.

[0012] Furthermore, the first and second connecting channels are coaxially arranged, and the second and third connecting channels are coaxially arranged.

[0013] Furthermore, along the first straight line, the piston includes a first section and a second section coaxially connected, wherein the second section is located between the first section and the plug, and a first gap is formed between the second section and the plug;

[0014] The first section is connected to the connecting part, and the outer surface of the second section makes sliding and sealing contact with the inner wall of the receiving cavity.

[0015] Furthermore, it also includes a return spring, with a stepped surface between the first and second sections of the piston, the step extending perpendicular to the first straight line, the return spring extending along the first straight line, and one end of the return spring abutting against the stepped surface, and the other end abutting against the inner wall of the top of the cavity of the receiving cavity.

[0016] The connector seat has a first positioning surface on the side facing the piston, and the bottom wall of the mounting groove is a second positioning surface. The first positioning surface and the second positioning surface are in contact with each other or separate from each other.

[0017] Furthermore, one section of the outer surface of the plug is threadedly connected to the inner wall of the receiving cavity; a first sealing ring is provided between the other section of the outer surface of the plug and the inner wall of the receiving cavity, and the first sealing ring is used for sealing.

[0018] Furthermore, it also includes an elastic support portion located outside the main body. The extension direction of the elastic support portion forms a first preset angle with the first straight line. The elastic support portion includes a support head, a support block, a support spring, and a support rod. The support block is provided with a support hole, and the support rod is movably inserted through the support hole. One end of the support rod facing the main body is connected to the support head. The support spring is coaxially sleeved on the support rod and is located between the support head and the support block. The first preset angle is an acute angle.

[0019] Furthermore, the elastic support also includes an anti-detachment block, which is detachably connected to the end of the support rod away from the support head, and the support block is located between the support head and the anti-detachment block.

[0020] Furthermore, it also includes a support, with the main body and elastic support both located on one side of the support.

[0021] Compared with the prior art, the advantages of this invention are:

[0022] I. This invention proposes a device for detecting the back pressure of a constant-pressure exhaust valve, comprising a test channel for flowing high-pressure gas required for testing. A first connecting channel within a first rubber sleeve and a second connecting channel within a second rubber sleeve are both part of the test channel. After the high-pressure gas flows out from the first connecting channel, it pushes a steel ball, causing the steel ball to overcome the pressure of the adjusting spring and lift the adjusting spring. The gas then flows back to the test channel from the second connecting channel, thus completing the detection of the back pressure of the constant-pressure exhaust valve. During the test, the conical or arc-shaped surface of the first rubber sleeve and the first... The arc-shaped opening has an interference fit with the hole wall to form a contact seal, and the conical or arc surface of the second rubber sleeve has an interference fit with the hole wall of the second arc-shaped opening to form a contact seal, thereby ensuring the sealing performance of the detection device with the first and second arc-shaped openings of the constant pressure exhaust valve during the test. Therefore, the present invention solves the technical problems existing in the prior art. It is now necessary to propose a detection device for the back pressure of a constant pressure exhaust valve, which can seal and connect with the first and second arc-shaped openings of the constant pressure exhaust valve during the measurement process, thereby improving the accuracy of the measurement results of the back pressure of the constant pressure exhaust valve.

[0023] II. In this invention, one end of the return spring abuts against the stepped surface, and the other end abuts against the inner wall of the cavity top. During the back pressure detection process, after high-pressure gas is injected into the first gap through the air intake channel, the piston, the connector seat, and the first and second rubber sleeves set on the connector seat all move in the direction away from the blockage. During this process, the return spring is compressed. After the back pressure detection is completed, the high-pressure gas injected into the air intake channel and the high-pressure gas in the detection channel are removed. The return spring will extend under its own elastic force, thereby pushing the piston in the direction of the blockage until the first positioning surface contacts the second positioning surface, so that the piston moves into place and completes the return action. Therefore, this invention solves the technical problem of how to make the piston, the first rubber sleeve and the second rubber sleeve set on the connector seat return to their original positions.

[0024] Third, in this invention, the support head is squeezed so that it moves toward the support block, the support spring is compressed, and then the constant pressure exhaust valve is sleeved on the body. The support head is released, the support spring extends elastically, and the support head presses against the outer surface of the constant pressure exhaust valve. Under the action of the elastic force of the support spring, the support head and the outer surface of the constant pressure exhaust valve remain relatively stationary through friction, thereby achieving the purpose of fixing the constant pressure exhaust valve.

[0025] Fourth, in this invention, one end of the support rod is inextricably bound to one side of the support block by the support head, and the other end of the support rod is inextricably bound to the other side of the support block by the anti-detachment block, thereby preventing the support rod from detaching from the support block. Attached Figure Description

[0026] Figure 1This is a schematic diagram of a constant pressure exhaust valve;

[0027] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0028] Figure 3 This is a schematic diagram of the structure of the constant pressure exhaust valve back pressure detection device of the present invention;

[0029] Figure 4 yes Figure 3 A structural diagram from another perspective;

[0030] Figure 5 yes Figure 4 A schematic diagram of the AA section;

[0031] Figure 6 This is a schematic diagram of the connector seat of the present invention;

[0032] Figure 7 yes Figure 6 Enlarged structural diagram of region B in the middle;

[0033] Figure 8 This is a schematic diagram of the structure of the main body of the invention;

[0034] Figure 9 yes Figure 8 A structural diagram from another perspective;

[0035] Figure 10 This is a schematic diagram showing the positional relationship between the connector, piston, and plug;

[0036] Figure 11 This is a schematic diagram of the air intake channel during use;

[0037] Figure 12 This is a schematic diagram showing the air intake channel and test channel during use.

[0038] Figure 13 This is a schematic diagram of the structure supporting the spring's return.

[0039] The markings in the figure are: body (1), receiving cavity (2), piston (3), plug (4), air intake channel (5), first gap (6), mounting groove (7), connecting hole (8), connector seat (9), first rubber sleeve (10), second rubber sleeve (11), connecting part (12), first channel (13), second channel (14), third channel (15), fourth channel (16), first connecting channel (17), second connecting channel (18), upper half (19), lower half (20), annular groove (21), first section (22), second section (23), first sealing ring (24), stepped surface (25), return spring (26), elastic support part (27), support head (28), support block (29), support spring (30), support (31), first connecting port (32), second connecting port (33), exhaust pipe (34), first positioning surface (35), second positioning surface (36), support rod (37), anti-detachment block (38). Detailed Implementation

[0040] The following detailed, non-limiting description of the invention's technical solutions, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length h," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0041] Example 1

[0042] like Figures 3-6As shown, this preferred embodiment proposes a constant pressure exhaust valve back pressure detection device, which includes a body 1, a receiving cavity 2 provided inside the body 1, the receiving cavity 2 extending along a first straight line, a coaxial piston 3 and a plug 4 provided inside the receiving cavity 2, along the first straight line, the outer circumferential surface of the piston 3 slidingly and sealingly contacts the inner wall of the receiving cavity 2, the outer surface of the plug 4 is fixedly and sealingly connected to the inner wall of the receiving cavity 2, and a first gap 6 exists between the piston 3 and the plug 4 along the direction of the first straight line; the body 1 also provides an air intake channel 5, the first gap 6 only connects to the air intake channel 5. The intake passage 5 is interconnected; the main body 1 is provided with a mounting groove 7 and a connecting hole 8. The mounting groove 7, connecting hole 8, and receiving cavity 2 are arranged sequentially along a first straight line. The mounting groove 7 communicates with the receiving cavity 2 through the connecting hole 8. The opening of the mounting groove 7 is positioned away from the receiving cavity 2. A connector seat 9 is provided inside the mounting groove 7. Along the direction of the first straight line, the connector seat 9 is movable within the mounting groove 7. A connecting part 12 is provided on the side of the connector seat 9 away from the opening of the mounting groove 7. The connecting part 12 passes through the connecting hole 8 and is connected to the piston 3 inside the receiving cavity 2. A first... The system includes a first channel 13, a second channel 14, a third channel 15, and a fourth channel 16; it also includes a first rubber sleeve 10 and a second rubber sleeve 11 made of elastic rubber material, with identical structures and arranged in parallel and oriented in the same direction. Both the first rubber sleeve 10 and the second rubber sleeve 11 are connected to the side surface of the connector seat 9 facing the groove 7. The side surfaces of the first rubber sleeve 10 and the second rubber sleeve 11 facing away from the connector seat 9 are both conical or arc-shaped surfaces. A first connecting channel 17 is provided inside the first rubber sleeve 10, and a second connecting channel 18 is provided inside the second rubber sleeve 11. The first connecting channel 17 and the second connecting channel 18 are arranged parallel to each other. The first connecting channel 17 forms a first connecting port 32 at the end of the first rubber sleeve 10 facing away from the connector seat 9, and the second connecting channel 18 forms a second connecting port 33 at the end of the second rubber sleeve 11 facing away from the connector seat 9. The system also includes a test channel, with the first channel 13, the second channel 14, the first connecting channel 17, the second connecting channel 18, the third channel 15, and the fourth channel 16 arranged sequentially and serving as components of the test channel.

[0043] like Figures 8-9 As shown, preferably, the body 1 is an approximately cylindrical structure, the receiving cavity 2 is an approximately cylindrical cavity, and preferably, the mounting groove 7 is a square groove, and the connecting hole 8 is a circular hole. Figure 10 As shown, the cross-sections of piston 3 and plug 4 are both circular.

[0044] like Figure 5 As shown above, the outer circumferential surface of piston 3 is in sliding sealing contact with the inner wall of receiving cavity 2. The sliding sealing structure adopts one of the existing technologies, for example, a sealing groove is provided on the outer circumferential surface of piston 3, and an O-ring is provided in the sealing groove.

[0045] More specifically, along the first straight line, the piston 3 includes a first segment 22 and a second segment 23 coaxially connected, wherein the second segment 23 is located between the first segment 22 and the plug 4, and a first gap 6 is formed between the second segment 23 and the plug 4; the first segment 22 is connected to the connecting part 12, and the outer surface of the second segment 23 has a sliding sealing contact with the inner wall of the receiving cavity 2.

[0046] like Figure 5 As mentioned above, the outer surface of the plug 4 is fixedly and sealed to the inner wall of the receiving cavity 2. Specifically, one section of the outer circumference of the plug 4 is threadedly connected to the inner wall of the receiving cavity 2; a first sealing ring 24 is provided between the other section of the outer circumference of the plug 4 and the inner wall of the receiving cavity 2, and the first sealing ring 24 is used for sealing.

[0047] like Figure 6 , Figure 7 As shown, the specific structure of the first rubber sleeve 10 is as follows: along the first straight line, the first rubber sleeve 10 is divided into an upper half 19 and a lower half 20. The side surface of the connector seat 9 facing away from the piston 3 is provided with an annular groove 21. The lower half 20 of the first rubber sleeve 10 is inserted into the annular groove 21, and the outer surface of the lower half 20 is press-fitted with the inner wall of the annular groove 21. The side surface of the first rubber sleeve 10 facing away from the piston 3, that is, the side surface of the upper half 19 facing away from the lower half 20, is a conical surface or an arc surface.

[0048] The first rubber sleeve 10 and the second rubber sleeve 11 are both made of elastic rubber material and have the same structure. They can be deformed when squeezed and can recover their deformation after the squeezing force is removed. The dimensions of the first rubber sleeve 10 and the second rubber sleeve 11 are configured according to the first arc-shaped opening and the second arc-shaped opening of the specific constant pressure exhaust valve, and there are no restrictions here.

[0049] like Figure 6 As shown, the test channel is used to circulate high-pressure gas. Preferably, the first connecting channel 17 and the second channel 14 are coaxially arranged, the second connecting channel 18 and the third channel 15 are coaxially arranged, and the first connecting channel 17 and the second connecting channel 18 are arranged parallel to each other.

[0050] like Figure 3 As shown, preferably, an exhaust pipe 34 is also provided on one side of the connector seat 9. The channel formed by the pipe wall of the exhaust pipe 34 is an exhaust channel, which is a component of the test channel and is located at the end of the test channel.

[0051] As can be seen from the background art, the existing technical problem is that there is a need to propose a detection device for the back pressure of a constant pressure exhaust valve, which can be sealed and connected with the first arc-shaped opening and the second arc-shaped opening of the constant pressure exhaust valve during the measurement process, thereby improving the accuracy of the measurement result of the back pressure of the constant pressure exhaust valve.

[0052] like Figures 11-12 As shown, in use, firstly, the constant pressure exhaust valve is fitted over the body 1. Then, high-pressure gas is injected into the first gap 6 through the intake channel 5. The blockage 4 remains stationary. Under the action of the high-pressure gas, the piston 3 is pushed away from the blockage 4. At the same time, the connector seat 9 connected to the piston 3, the first rubber sleeve 10 and the second rubber sleeve 11 set on the connector seat 9 also move away from the blockage 4 along with the piston 3 until the first connecting channel 17 connects with the first arc-shaped opening of the constant pressure exhaust valve body through the first connecting port 32. The conical or arc-shaped surface of the first rubber sleeve 10 is aligned with the wall of the first arc-shaped opening. An interference fit forms a contact seal. The second connecting channel 18 connects to the second arc-shaped opening of the constant pressure exhaust valve body through the second connecting port 33. The conical or arc-shaped surface of the second rubber sleeve 11 is interference-fitted with the wall of the second arc-shaped opening to form a contact seal. Then, high-pressure gas is injected into the test channel. The high-pressure gas passes through the first channel 13, the second channel 14, the first connecting channel 17 in sequence, lifts the steel ball in the constant pressure exhaust valve and compresses the pressure regulating spring. After passing through the working channel inside the constant pressure exhaust valve, it passes through the second connecting channel 18, the third channel 15, the fourth channel 16, the exhaust pipe 34, and is finally discharged.

[0053] In this embodiment, a device for detecting the back pressure of a constant-pressure exhaust valve is proposed. The device includes a test channel for the flow of high-pressure gas required for the test. The first connecting channel 17 within the first rubber sleeve 10 and the second connecting channel 18 within the second rubber sleeve 11 are both part of the test channel. After the high-pressure gas flows out from the first connecting channel 17, it pushes a steel ball, causing the steel ball to overcome the pressure of the adjusting spring and lift the adjusting spring. The gas then flows back to the test channel from the second connecting channel 18, thus completing the detection of the back pressure of the constant-pressure exhaust valve. During the test, the conical surface of the first rubber sleeve 10 or... The arc surface and the wall of the first arc-shaped opening are press-fitted together to form a contact seal, and the conical or arc surface of the second rubber sleeve 11 is press-fitted together with the wall of the second arc-shaped opening to form a contact seal, thereby ensuring the sealing performance of the detection device with the first arc-shaped opening and the second arc-shaped opening of the constant pressure exhaust valve during the test. Therefore, this embodiment solves the technical problems existing in the prior art. Now, it is necessary to propose a detection device for the back pressure of a constant pressure exhaust valve, which can seal and connect with the first arc-shaped opening and the second arc-shaped opening of the constant pressure exhaust valve during the measurement process, thereby improving the accuracy of the measurement result of the back pressure of the constant pressure exhaust valve.

[0054] Furthermore, as mentioned above, during the back pressure detection process, after high-pressure gas is injected into the first gap 6 through the air intake channel 5, the piston 3, the connector seat 9, and the first rubber sleeve 10 and the second rubber sleeve 11 set on the connector seat 9 all move in the direction away from the blockage 4. Therefore, after the back pressure detection is completed, how to make the piston 3, the first rubber sleeve 10 and the second rubber sleeve 11 set on the connector seat 9 return to their original positions is the next technical problem to be solved. This technical problem is solved by the following technical solution.

[0055] like Figure 5 , Figure 6 , Figures 11-13 As shown, this embodiment also includes the following technical solution: a constant pressure exhaust valve back pressure detection device, which also includes a return spring 26. The piston 3 has a stepped surface 25 between the first section 22 and the second section 23. The extension direction of the stepped surface 25 is perpendicular to the first straight line. The return spring 26 extends along the first straight line, and one end of the return spring 26 abuts against the stepped surface 25, and the other end abuts against the inner wall of the top of the cavity of the receiving cavity 2. The connector seat 9 is provided with a first positioning surface 35 on the side facing the piston 3. The bottom wall of the mounting groove 7 is a second positioning surface 36. The first positioning surface 35 and the second positioning surface 36 are in contact with each other or separated from each other.

[0056] In this embodiment, one end of the return spring 26 abuts against the stepped surface 25, and the other end abuts against the inner wall of the top of the cavity 2. During the back pressure detection process, after high-pressure gas is injected into the first gap 6 through the air intake channel 5, the piston 3, the connector seat 9, and the first rubber sleeve 10 and the second rubber sleeve 11 set on the connector seat 9 all move in the direction away from the blockage 4. During this process, the return spring 26 is compressed. After the back pressure detection is completed, the high-pressure gas injected into the air intake channel 5 is removed, and the high-pressure gas in the detection channel is also removed. The return spring 26 will extend under its own elastic force, thereby pushing the piston 3 in the direction of the blockage 4 until the first positioning surface 35 contacts the second positioning surface 36, so that the piston 3 moves into place and completes the return action. Therefore, this embodiment solves the technical problem of how to make the piston 3, the first rubber sleeve 10 and the second rubber sleeve 11 set on the connector seat 9 return to their original positions.

[0057] like Figure 3 , Figure 4As shown, the constant pressure exhaust valve back pressure detection device of this embodiment further includes an elastic support 27. The elastic support 27 is located outside the main body 1. The extension direction of the elastic support 27 forms a first preset angle with the first straight line. The elastic support 27 includes a support head 28, a support block 29, a support spring 30, and a support rod 37. The support block 29 is provided with a support hole. The support rod 37 is movably inserted through the support hole. One end of the support rod 37 facing the main body 1 is connected to the support head 28. The support spring 30 is coaxially sleeved on the support rod 37. The support spring 30 is located between the support head 28 and the support block 29. The first preset angle is an acute angle.

[0058] In this embodiment, the support head 28 is squeezed, causing it to move toward the support block 29. The support spring 30 is compressed. Then, the constant pressure exhaust valve is sleeved on the body 1. The support head 28 is released, and the support spring 30 extends elastically. The support head 28 presses against the outer surface of the constant pressure exhaust valve. Under the action of the elastic force of the support spring 30, the support head 28 and the outer surface of the constant pressure exhaust valve remain relatively stationary due to friction, thereby achieving the purpose of fixing the constant pressure exhaust valve.

[0059] Furthermore, the elastic support portion 27 also includes an anti-detachment block 38, which is detachably connected to the end of the support rod 37 facing away from the support head 28. The support block 29 is located between the support head 28 and the anti-detachment block 38. In this embodiment, one end of the support rod 37 is inextricably bound to one side of the support block 29 via the support head 28, and the other end of the support rod 37 is inextricably bound to the other side of the support block 29 via the anti-detachment block 38, thereby preventing the support rod 37 from detaching from the support block 29.

[0060] like Figure 3 , Figure 4 As shown, the constant pressure exhaust valve back pressure detection device of this embodiment further includes a support 31, and the body 1 and the elastic support part 27 are both arranged on one side of the support 31.

[0061] Support 31 provides support for the entire body 1 and the elastic support part 27.

[0062] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A device for detecting the back pressure of a constant pressure exhaust valve, characterized in that, Includes a body (1), a receiving cavity (2) is provided inside the body (1), the receiving cavity (2) extends along a first straight line, a coaxial piston (3) and a plug (4) are provided inside the receiving cavity (2), along the first straight line, the outer circumferential surface of the piston (3) slides and seals against the inner wall of the receiving cavity (2), the outer surface of the plug (4) is fixedly and sealably connected to the inner wall of the receiving cavity (2), and a first gap (6) exists between the piston (3) and the plug (4) along the direction of the first straight line; The main body (1) is also provided with an air intake channel (5), and the first gap (6) is only connected to the air intake channel (5); the main body (1) is provided with an installation groove (7) and a connecting hole (8), the installation groove (7) is connected to the receiving cavity (2) through the connecting hole (8), and the groove opening of the installation groove (7) is set away from the receiving cavity (2); a connector seat (9) is provided in the installation groove (7), and the connector seat (9) is movable in the installation groove (7) along the direction of the first straight line; a connecting part (12) is provided on the side of the connector seat (9) away from the groove opening of the installation groove (7), and the connecting part (12) passes through the connecting hole (8) and is connected to the piston (3) in the receiving cavity (2); a first channel (13), a second channel (14), a third channel (15), and a fourth channel (16) are provided in the connector seat (9); It also includes a first rubber sleeve (10) and a second rubber sleeve (11) made of elastic rubber material, with the same structure and arranged in parallel in the same direction. The first rubber sleeve (10) and the second rubber sleeve (11) are both connected to the side surface of the connector seat (9) facing the groove (7). The side surface of the first rubber sleeve (10) and the second rubber sleeve (11) away from the connector seat (9) are both conical or arc-shaped. A first connecting channel (17) is provided in the first rubber sleeve (10), and a second connecting channel (18) is provided in the second rubber sleeve (11). The first connecting channel (17) forms a first connecting port (32) at the end of the first rubber sleeve (10) away from the connector seat (9), and the second connecting channel (18) forms a second connecting port (33) at the end of the second rubber sleeve (11) away from the connector seat (9). It also includes test channels, with the first channel (13), the second channel (14), the first connection channel (17), the second connection channel (18), the third channel (15), and the fourth channel (16) set up in sequence and serving as components of the test channels respectively.

2. The device for detecting the back pressure of a constant pressure exhaust valve according to claim 1, characterized in that, Along the first straight line, the first rubber sleeve (10) is divided into an upper half (19) and a lower half (20). The connector seat (9) has an annular groove (21) on the side surface away from the piston (3). The lower half (20) of the first rubber sleeve (10) is inserted into the annular groove (21), and the outer surface of the lower half (20) is interference-fitted with the inner wall of the annular groove (21). The surface of the first rubber sleeve (10) facing away from the piston (3), that is, the surface of the upper half (19) facing away from the lower half (20), is a conical surface or an arc surface.

3. The device for detecting the back pressure of a constant pressure exhaust valve according to claim 2, characterized in that, The first connecting channel (17) and the second channel (14) are coaxially arranged, and the second connecting channel (18) and the third channel (15) are coaxially arranged.

4. The device for detecting the back pressure of a constant pressure exhaust valve according to any one of claims 1-3, characterized in that, Along the first straight line, the piston (3) includes a first segment (22) and a second segment (23) connected coaxially, wherein the second segment (23) is located between the first segment (22) and the plug (4), and the first gap (6) is formed between the second segment (23) and the plug (4); The first segment (22) is connected to the connecting part (12), and the outer surface of the second segment (23) is in sliding sealing contact with the inner wall of the receiving cavity (2).

5. The device for detecting the back pressure of a constant pressure exhaust valve according to claim 4, characterized in that, It also includes a return spring (26), and there is a stepped surface (25) between the first section (22) and the second section (23) of the piston (3). The extension direction of the stepped surface (25) is perpendicular to the first straight line. The return spring (26) extends along the first straight line, and one end of the return spring (26) abuts against the stepped surface (25), and the other end abuts against the inner wall of the top of the cavity of the receiving cavity (2). The connector seat (9) is provided with a first positioning surface (35) on the side facing the piston (3), and the bottom wall of the mounting groove (7) is a second positioning surface (36). The first positioning surface (35) and the second positioning surface (36) are in contact with each other or separated from each other.

6. The device for detecting the back pressure of a constant pressure exhaust valve according to claim 1, characterized in that, One section of the outer circumference of the plug (4) is threadedly connected to the inner wall of the receiving cavity (2); a first sealing ring (24) is provided between the other section of the outer circumference of the plug (4) and the inner wall of the receiving cavity (2), and the first sealing ring (24) is used for sealing.

7. The device for detecting the back pressure of a constant pressure exhaust valve according to claim 1, characterized in that, It also includes an elastic support part (27), which is located outside the main body (1). The extension direction of the elastic support part (27) forms a first preset angle with the first straight line. The elastic support part (27) includes a support head (28), a support block (29), a support spring (30), and a support rod (37). The support block (29) is provided with a support hole, and the support rod (37) is movably inserted through the support hole. The end of the support rod (37) facing the main body (1) is connected to the support head (28). The support spring (30) is coaxially sleeved on the support rod (37) and is located between the support head (28) and the support block (29). The first preset angle is an acute angle.

8. The device for detecting the back pressure of a constant pressure exhaust valve according to claim 7, characterized in that, The elastic support (27) also includes an anti-detachment block (38), which is detachably connected to the end of the support rod (37) away from the support head (28), and the support block (29) is located between the support head (28) and the anti-detachment block (38).

9. The device for detecting the back pressure of a constant pressure exhaust valve according to claim 7, characterized in that, It also includes a support (31), and the main body (1) and the elastic support (27) are both located on one side of the support (31).

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