Universal type exhaust alarm device with anti-loosening function

Abstract

This utility model relates to the application field of metering pump products, specifically to a universal exhaust alarm device with anti-loosening function. It includes an exhaust valve body, the side of which is connected to a pressure gauge via an instrument connector assembly. One end of the exhaust valve body is connected to a vent nozzle, and the other end is connected to an exhaust valve connector. It also includes a reverse threaded sleeve, which has two sets of threads with opposite directions inside. The end threads of the exhaust valve body and the end threads of the exhaust valve connector have opposite directions, and their ends are connected by the reverse threaded sleeve. The outer surface of the reverse threaded sleeve has two fastening screw holes, which are respectively connected to the two sets of threads inside the sleeve. Anti-loosening soft balls are provided in the two fastening screw holes, and fastening screws are screwed into them. This utility model can conveniently and accurately set the preload of the return spring in the exhaust valve, while simultaneously adjusting the pressure gauge position.

Description

Technical Field

[0001] This utility model relates to the application field of metering pump products, specifically to a universal exhaust alarm device with anti-loosening function. Background Technology

[0002] The venting and diaphragm rupture alarm device on the hydraulic end of a hydraulic diaphragm metering pump is used to release gas between the two diaphragms on the pump's hydraulic end. If either diaphragm ruptures unexpectedly, a pressure gauge connected to the device will display a pressure reading as an alarm. Currently, the venting and diaphragm rupture alarm device is connected to the air guide plate on the hydraulic end of the metering pump via a vent valve connector. The vent valve and vent valve connector are threaded together, with a valve ball and return spring between them. Due to the sealing requirements between the vent valve and vent valve connector, Teflon tape needs to be wrapped around them during the screw-on connection to ensure a secure fit.

[0003] For example, Chinese utility model patent CN206234103U discloses a venting alarm device for a diaphragm metering pump, comprising: a guide plate with vent holes disposed between the pump head and the pump body; two diaphragms disposed on the guide plate, the two diaphragms forming a vacuum chamber that communicates with the vent holes; and an adjustable venting alarm valve disposed on the guide plate and communicating with the vent holes. The adjustable venting alarm valve includes a venting valve seat sealed to the guide plate, a venting valve sealed to the venting valve seat, a venting nozzle threadedly sealed to the venting valve, and a pressure sensor. The connection method between the venting valve and the venting valve seat in the above utility model makes it difficult to adjust the preload of the return spring located between the venting valve and the venting valve connector, which significantly affects the product's performance parameters and consistency, and is highly dependent on the assembly personnel's experience. Furthermore, relying on the screw-on method with PTFE tape cannot simultaneously guarantee a reliable connection between the venting valve and the venting valve connector, or the position of the pressure gauge connected to the side of the venting valve. Utility Model Content

[0004] In the existing technology, the preload of the return spring in the exhaust valve is not easy to adjust, which cannot ensure a secure connection between the exhaust valve and the exhaust valve connector while simultaneously adjusting the pressure gauge position. This utility model proposes a universal exhaust alarm device that can ensure the preload of the return spring while adjusting the pressure gauge position.

[0005] To achieve the above-mentioned technical effects, this utility model proposes:

[0006] A universal exhaust alarm device with anti-loosening function includes an exhaust valve body. A pressure gauge is connected to the side of the exhaust valve body via an instrument connector assembly. One end of the exhaust valve body is connected to a vent nozzle, and the other end is connected to an exhaust valve connector. A first valve ball is provided between the exhaust valve body and the vent nozzle. A spring and a second valve ball are provided between the exhaust valve body and the exhaust valve connector. The device also includes a reverse threaded sleeve. The reverse threaded sleeve has two sets of threaded surfaces with opposite directions of rotation inside. The end thread of the exhaust valve body and the end thread of the exhaust valve connector have opposite directions of rotation, and their ends are connected by the reverse threaded sleeve. The outer surface of the reverse threaded sleeve has two fastening screw holes, which are respectively connected to the two sets of threaded surfaces inside the reverse threaded sleeve. Anti-loosening soft balls are provided in the two fastening screw holes, and fastening screws are screwed into them.

[0007] The internal thread of the exhaust valve connector is designed to match the external thread structure of the exhaust valve, with opposite directions of rotation. They are connected using a reversible threaded sleeve. The reversible threaded sleeve has two sets of threaded surfaces with opposite rotation directions inside. During connection, the exhaust valve connector is first fixed in position, the pressure gauge is set to a preset position, and the reversible threaded sleeve is rotated counterclockwise or clockwise (depending on the thread direction of the exhaust valve end). This simultaneously screws the exhaust valve and exhaust valve connector into the reversible threaded sleeve, completing the connection. The outer surface of the reversible threaded sleeve has two fastening screw holes, which connect to the reversible threaded surfaces on the inner surface of the sleeve. Fastening screws and anti-loosening balls are used to secure the threaded connection of the internal threaded surfaces, ensuring a stable and reliable connection between the exhaust valve and the exhaust valve connector.

[0008] The exhaust valve body and the exhaust valve connector have a concave-convex surface structure. The exhaust valve body has a convex surface at one end, and the exhaust valve connector has a concave surface at one end. A sealing gasket is provided between the convex surface and the concave surface. The concave-convex surface structure can further improve the connection stability and sealing performance of the exhaust valve and the exhaust valve connector.

[0009] The convex surface and the concave surface compress the sealing gasket, and the compression amount of the sealing gasket ranges from 0.2mm to 0.5mm.

[0010] The outer side of the instrument connector assembly is provided with the fastening screw hole, and the anti-loosening soft ball is provided in the fastening screw hole and the fastening screw is screwed in.

[0011] The anti-loosening soft ball is made of nylon or polytetrafluoroethylene, and the fastening screw is made of stainless steel.

[0012] The pressure switch or pressure transmitter is connected to the side of the exhaust valve, and the pressure switch or pressure transmitter is connected to the pressure gauge through the internal air passage of the exhaust valve.

[0013] The exhaust valve connector is connected to a flexible tube, which is located at the end furthest from the exhaust valve. Using a flexible tube to connect to the exhaust valve connector allows the entire device to be installed vertically, preventing tilting and thus ensuring the second valve ball's return to its original position under gravity is effective.

[0014] One end of the flexible tube is welded to the exhaust valve, and the other end is welded to the air guide plate of the metering pump head.

[0015] A sealing ring is provided between the vent nozzle and the exhaust valve.

[0016] The beneficial effects of this utility model are:

[0017] 1. Optimize the connection method between the exhaust valve and the exhaust valve connector, making it easier to set the spring preload; 2. Allow for preset pressure gauge setting position, improving the aesthetics of the device; 3. Anti-loosening soft ball ensures a secure connection between the exhaust valve and the exhaust valve connector, preventing damage to the threaded surface of the fastening screw. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model installed on the air guide plate.

[0020] In the picture:

[0021] 1. Exhaust valve; 2. Exhaust valve connector; 3. Vent nozzle; 4. Pressure gauge; 5. Instrument connector assembly; 6. Pump head air guide plate; 7. Pressure tap; 8. Reverse threaded sleeve;

[0022] 101. First valve ball; 102. Second valve ball; 103. Spring; 104. Sealing ring; 105. Fastening screw hole; 106. Fastening screw; 107. Anti-loosening soft ball; 108. Sealing gasket; 109. Flexible tube. Detailed Implementation

[0023] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0024] In the prior art, the exhaust valve 1 and exhaust valve connector 2 of the exhaust device rely on the screw-on method of Teflon tape, which cannot simultaneously guarantee a reliable screw-on connection between the exhaust valve 1 and exhaust valve connector 2, and the position of the pressure gauge 4 connected to the side of the exhaust valve 1. This further affects the preload of the spring 103, resulting in poor lifting and lowering effect of the second valve ball 102 and untimely response. At the same time, due to the space constraints of the metering pump, the exhaust device is usually set at an angle, which can cause the valve ball to get stuck and not reseat smoothly. In addition, the preload of the spring 103 cannot be too large, so it is not possible to reliably tighten it by relying solely on the force of the spring 103. Therefore, poor sealing between the valve ball and the valve seat is likely to occur. When the plunger of the metering pump reaches the suction stroke, air is drawn back into the diaphragm interlayer, causing insufficient discharge. To address the problems in the prior art, the following is a preferred embodiment of the present invention.

[0025] Example 1

[0026] Reference Appendix Figure 1 The universal exhaust alarm device with anti-loosening function in this embodiment includes an exhaust valve 1 body. The side of the exhaust valve 1 body is connected to a pressure gauge 4 through an instrument connector assembly 5. One end of the exhaust valve 1 body is connected to a vent 3, and the other end is connected to an exhaust valve connector 2. A first valve ball 101 is provided between the exhaust valve 1 body and the vent 3. A spring 103 and a second valve ball 102 are provided between the exhaust valve 1 body and the exhaust valve connector 2.

[0027] Specifically, the exhaust valve 1 has two interconnected air passages that pass through it axially and radially, respectively. The axial end faces of the exhaust valve 1 have internal and external threads, respectively. The internal thread end is screwed onto the vent nozzle 3, and a sealing ring 104 is provided between them to improve airtightness. At the internal thread end, where the air passage passes through the exhaust valve 1 axially, there is a cavity to accommodate the first valve ball 101. The first valve ball 101 is located in this cavity. Under normal conditions, the first valve ball 101 is closed by gravity. When driven by airflow from the other end of the air passage, it is lifted, allowing airflow to pass through and be discharged via the vent valve. At the external thread end, where the air passage passes through the exhaust valve 1 axially, there is a cavity to accommodate a spring 103, which is used to abut against the second valve ball 102. The air passage passing through the exhaust valve 1 radially is connected to the air passage passing through it axially.

[0028] One end face of the exhaust valve connector 2 has a cavity for accommodating the second ball valve. This end has a threaded surface with the opposite direction to the thread of the external threaded end of the exhaust valve 1, and its outer diameter is equal to that of the external threaded end of the exhaust valve 1. This end is used to mate with the external threaded end of the exhaust valve 1, forming a cavity to accommodate the spring 103 and the second ball valve 102. The other end of the exhaust valve connector 2 has an air hole that connects to the cavity containing the second ball valve 102. Under normal conditions, the spring 103 is compressed to generate a preload. The second ball valve 102, under the influence of gravity and the thrust of the spring 103, closes this through-hole. Driven by airflow from the air hole, the spring 103 is lifted, allowing airflow to pass through. The air hole on one side of the cavity is enlarged to increase the diameter of the circle where its opening contacts the second ball valve 102, improving airflow efficiency.

[0029] In this embodiment, a reverse threaded sleeve 8 is also included. The reverse threaded sleeve 8 has two sets of threaded surfaces with opposite directions inside. The end thread of the exhaust valve 1 body and the end thread of the exhaust valve connector 2 have opposite directions, and their ends are connected by the reverse threaded sleeve 8. The outer side of the reverse threaded sleeve 8 is provided with two fastening screw holes 105. The two fastening screw holes 105 are respectively connected to the two sets of threaded surfaces inside the reverse threaded sleeve 8, and the two fastening screw holes 105 are provided with anti-loosening soft balls 107 and fastening screws 106 are screwed into them.

[0030] Specifically, the inner surface of the reversible threaded sleeve 8 has two sets of threads with opposite directions cut in half along its thickness direction, used for screwing the exhaust valve 1 and the exhaust valve connector 2 respectively. Since the threads at the mating ends of the exhaust valve 1 and the exhaust valve connector 2 are screwed together, while ensuring that the circumferential orientations of the exhaust valve 1 and the exhaust valve connector 2 are different (i.e., the exhaust valve 1 and the exhaust valve connector 2 do not rotate), the exhaust valve 1 and the exhaust valve connector 2 can be moved closer or further apart by rotating the reversible threaded sleeve in opposite directions. Furthermore, a sealing gasket 108 is provided on the mating end face of the exhaust valve 1 and the exhaust valve connector 2 to ensure airtightness between them.

[0031] The fastening screw hole 105 is located near both ends of the positive and negative threaded sleeve 8. An anti-loosening soft ball 107 is provided between the screw-in locking screw and the threaded surface of the exhaust valve 1 or exhaust valve connector 2. After the exhaust valve 1 and exhaust valve connector 2 are connected, the anti-loosening soft ball 107 is placed into the fastening screw hole 105, the fastening screw 106 is screwed in, and the anti-loosening soft ball 107 is squeezed, which creates a certain amount of pressure on the threaded surface of the exhaust valve 1 or exhaust valve connector 2 to prevent the threaded connection from loosening due to factors such as vibration of the metering pump.

[0032] Example 2

[0033] Reference Appendix Figure 1 and 2In this embodiment, the universal exhaust alarm device with anti-loosening function includes an exhaust valve 1 body. The side of the exhaust valve 1 body is connected to a pressure gauge 4 through an instrument connector assembly 5. One end of the exhaust valve 1 body is connected to a vent 3, and the other end is connected to an exhaust valve connector 2. The exhaust valve 1 and the exhaust valve connector 2 are connected by a positive and negative threaded sleeve 8.

[0034] Specifically, there is a first valve ball 101 between the vent nozzle 3 and the exhaust valve 1, and a spring 103 and a second valve ball 102 are provided between the exhaust valve 1 and the exhaust valve connector 2. The spring 103 abuts against the exhaust valve 1, and the second valve ball 102 abuts against the exhaust valve connector 2.

[0035] In this embodiment, the reversible threaded sleeve 8 has two sets of threaded surfaces with opposite directions of rotation inside. The end thread of the exhaust valve 1 body and the end thread of the exhaust valve connector 2 have opposite directions of rotation, and their ends are connected by the reversible threaded sleeve 8. By fixing the exhaust valve 1 and the exhaust valve connector 2 and rotating the reversible threaded sleeve 8, the ends of the exhaust valve 1 and the exhaust valve connector 2 can be connected to form a cavity that accommodates the spring 103 and the second valve ball 102.

[0036] The outer surface of the reversible threaded sleeve 8 has two fastening screw holes 105, which are respectively connected to two sets of threaded surfaces inside the reversible threaded sleeve 8. Each of the two fastening screw holes 105 contains an anti-loosening ball 107 and is screwed onto a fastening screw 106. The fastening screw 106 is made of stainless steel. To prevent damage to the threaded surfaces caused by direct contact between the fastening screw 106 and the threaded surfaces to be fastened, an anti-loosening ball 107 is provided between the fastening screw 106 and the threaded surfaces to be fastened. In this embodiment, the anti-loosening ball 107 is made of nylon; in some other embodiments, it may be made of polytetrafluoroethylene (PTFE).

[0037] It should be noted that the function of the anti-loosening soft ball 107 is to prevent the fastening screw 106 from damaging the threaded surface to be tightened. Therefore, a small ball made of a relatively soft material, similar to the material of the fastening screw 106 and the threaded surface to be tightened, needs to be placed between the two to prevent loosening and to provide isolation. In this embodiment, the anti-loosening soft ball 107 can be replaced with other relatively soft materials, as long as it effectively isolates the threaded surface to be tightened from the fastening screw 106 while still achieving a tightening effect.

[0038] In this embodiment, a concave-convex surface structure is provided between the exhaust valve 1 body and the exhaust valve connector 2. The exhaust valve 1 body has a convex surface at its end, and the exhaust valve connector 2 has a concave surface at its end. A sealing gasket 108 is provided between the convex and concave surfaces. The concave-convex surface structure enables the exhaust valve 1 and the exhaust valve connector 2 to be more accurately connected, and also serves to position the sealing gasket 108.

[0039] Specifically, the convex and concave surfaces compress the sealing gasket 108, with the compression range being 0.2mm to 0.5mm. Since the spring 103 has certain requirements for the preload of the second valve ball 102, if the preload is too large, the load on the second valve ball 102 increases, hindering air discharge; if the preload is too small, it fails to promote the rapid return of the second valve ball 102. Therefore, the structural characteristics of the positive and negative threaded sleeve 8 with the exhaust valve 1 and exhaust valve connector 2, as well as the concave and convex surface structure, allow assemblers to easily control the preload of the spring 103.

[0040] In this embodiment, a fastening screw hole 105 is provided on the outer side of the instrument connector assembly 5. An anti-loosening soft ball 107 is provided in the fastening screw hole 105 and a fastening screw 106 is screwed into it. The structure of the fastening screw 106 and the anti-loosening soft ball 107 is incorporated into the threaded connection between the pressure gauge 4 and the instrument connector assembly 5 to prevent the instrument from being accidentally loosened during the transportation of the device.

[0041] In other embodiments of this example, the exhaust valve connector 2 is connected to a flexible tube 109, which is located at the end away from the concave surface. One end of the flexible tube 109 is welded to the exhaust valve 1, and the other end is welded to the pump head guide plate 6 of the metering pump. Specifically, the flexible tube 109 is made of thin-walled steel pipe, and a suitable length of thin-walled steel pipe can be bent to keep the exhaust device in a vertical position. The exhaust valve connector 2 is provided with an air hole at the end where it is welded to the flexible tube 109. At the same time, the hole at this end is enlarged, and one end of the flexible tube 109 is connected to this enlarged hole and fully welded to ensure airtightness. The other end of the flexible tube 109 is connected to the pressure hole 7 of the pump head guide plate 6 and fully welded. The use of the flexible tube 109 connection method ensures the airtightness between the exhaust valve connector 2 and the pressure hole 7 on the pump head guide plate 6, and at the same time, the exhaust valve 1 and the exhaust valve connector 2 are set vertically to avoid the effect of tilting on the effect of the first valve ball 101 and the second valve ball 102.

[0042] Example 3

[0043] Reference Appendix Figure 1 In this embodiment, the universal exhaust alarm device with anti-loosening function includes an exhaust valve 1 body. The side of the exhaust valve 1 body is connected to a pressure gauge 4 through an instrument connector assembly 5. One end of the exhaust valve 1 body is connected to a vent 3, and the other end is connected to an exhaust valve connector 2. The exhaust valve 1 and the exhaust valve connector 2 are connected by a positive and negative threaded sleeve 8.

[0044] Specifically, there is a first valve ball 101 between the vent nozzle 3 and the exhaust valve 1, and a spring 103 and a second valve ball 102 are provided between the exhaust valve 1 and the exhaust valve connector 2. The spring 103 abuts against the exhaust valve 1, and the second valve ball 102 abuts against the exhaust valve connector 2.

[0045] In this embodiment, the reversible threaded sleeve 8 has two sets of threaded surfaces with opposite directions of rotation inside. The end thread of the exhaust valve 1 body and the end thread of the exhaust valve connector 2 have opposite directions of rotation, and their ends are connected by the reversible threaded sleeve 8. By fixing the exhaust valve 1 and the exhaust valve connector 2 and rotating the reversible threaded sleeve 8, the ends of the exhaust valve 1 and the exhaust valve connector 2 can be connected to form a cavity that accommodates the spring 103 and the second valve ball 102.

[0046] The outer side of the reversible threaded sleeve 8 has two fastening screw holes 105, which are respectively connected to two sets of threaded surfaces inside the reversible threaded sleeve 8. Each of the two fastening screw holes 105 has an anti-loosening ball 107 and is screwed onto a fastening screw 106. To prevent damage to the threaded surfaces caused by direct contact between the fastening screw 106 and the threaded surface to be fastened, an anti-loosening ball 107 is provided between the fastening screw 106 and the threaded surface to be fastened.

[0047] In this embodiment, a pressure switch or pressure transmitter is connected to the side of the exhaust valve 1, and the pressure switch or pressure transmitter is connected to the pressure gauge 4 through the internal air passage of the exhaust valve 1. A hydraulic bypass for connecting an external pressure switch or pressure transmitter is added to the exhaust valve 1 to achieve remote alarm display.

[0048] This utility model features a universal exhaust alarm device with anti-loosening function. It optimizes the connection method between the exhaust valve and the exhaust valve connector, making it easier to set the spring preload and preset the pressure gauge position, thus improving the device's aesthetics. The anti-loosening soft ball ensures a secure connection between the exhaust valve and the exhaust valve connector, preventing damage to the threaded surface of the fastening screws.

[0049] The above description is a preferred embodiment of the present utility model, used to illustrate the present utility model and its effects. It should be noted that, for those skilled in the art, for the purpose of making foreseeable improvements and modifications without departing from the principles of the present utility model, such improvements and modifications are also within the protection scope of the present utility model.

Claims

1. A universal exhaust alarm device with anti-loosening function, comprising an exhaust valve body, wherein a pressure gauge is connected to the side of the exhaust valve body via an instrument connector assembly, one end of the exhaust valve body is connected to a vent nozzle, and the other end is connected to an exhaust valve connector, characterized in that, Also includes: The reversible threaded sleeve has two sets of threaded surfaces with opposite directions inside. The end thread of the exhaust valve body and the end thread of the exhaust valve connector have opposite directions, and their ends are connected by the reversible threaded sleeve. The outer side of the positive and negative threaded sleeve is provided with two fastening screw holes. The two fastening screw holes are respectively connected to two sets of threaded surfaces inside the positive and negative threaded sleeve, and anti-loosening soft balls are provided in the two fastening screw holes and fastening screws are screwed in.

2. A universal exhaust alarm device with anti-loosening function according to claim 1, characterized in that, The exhaust valve body and the exhaust valve connector are provided with a concave-convex surface structure. The exhaust valve body has a convex surface at its end and the exhaust valve connector has a concave surface at its end. A sealing gasket is provided between the convex surface and the concave surface.

3. A universal exhaust alarm device with anti-loosening function according to claim 2, characterized in that, The convex surface and the concave surface compress the sealing gasket, and the compression amount of the sealing gasket ranges from 0.2mm to 0.5mm.

4. A universal exhaust alarm device with anti-loosening function according to claim 1, 2, or 3, characterized in that, The outer side of the instrument connector assembly is provided with the fastening screw hole, and the anti-loosening soft ball is provided in the fastening screw hole and the fastening screw is screwed in.

5. A universal exhaust alarm device with anti-loosening function according to claim 4, characterized in that, The anti-loosening soft ball is made of nylon or polytetrafluoroethylene, and the fastening screw is made of stainless steel.

6. A universal exhaust alarm device with anti-loosening function according to claim 1, characterized in that, The pressure switch or pressure transmitter is connected to the side of the exhaust valve, and the pressure switch or pressure transmitter is connected to the pressure gauge through the internal air passage of the exhaust valve.

7. A universal exhaust alarm device with anti-loosening function according to claim 1, characterized in that, The exhaust valve connector is connected to a flexible tube, which is located at the end furthest from the exhaust valve.

8. A universal exhaust alarm device with anti-loosening function according to claim 7, characterized in that, One end of the flexible tube is welded to the exhaust valve, and the other end is welded to the air guide plate of the metering pump head.

9. A universal exhaust alarm device with anti-loosening function according to claim 1, characterized in that, A sealing ring is provided between the vent nozzle and the exhaust valve.

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