A diaphragm pump overpressure flow limiting structure and diaphragm pump

Abstract

The utility model discloses a diaphragm pump overpressure flow limiting structure and diaphragm pump belong to diaphragm pump field. Diaphragm pump overpressure flow limiting structure includes the protective cover, microswitch, spring cover, spring, spring seat, spring cover stop piece and pressure regulating screw, the protective cover is equipped with switch containing groove and spring cover containing groove, and the microswitch is set in the switch containing groove, and the spring cover includes spring mounting cover and the pressure rod at its side portion, and the spring mounting cover and spring cover containing groove slide fit, and the pressure rod and microswitch contact contact, the spring is set in the spring mounting cover, and the spring seat is fixed to the spring top, and the spring cover stop piece is fixed to spring cover containing groove opening outer edge, and the spring mounting cover passes through spring cover stop piece and extends, and the pressure rod is through the notch of spring cover stop piece side wall and extends and slides up and down, and the pressure regulating screw is set up on the protective cover and is in contact with spring seat. The utility model discloses through containing groove and the limiting structure on the protective cover realize each component positioning assembly, improve assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of diaphragm pumps, and in particular to an overpressure flow limiting structure for a diaphragm pump and the diaphragm pump itself. Background Technology

[0002] Existing miniature diaphragm pumps use overload backflow (overflow) or automatic power-off via pressure switches to control and limit pressure, preventing excessive pressure from causing safety hazards.

[0003] Currently, the pressure regulating and flow limiting devices used in diaphragm pumps employing automatic power-off via pressure switches are relatively large compared to the pump itself. One type of pressure regulating and flow limiting device is... Figure 1 As shown, the installation of the voltage regulating and current limiting device involves many components, the assembly process is complex, and the production cost is high. Utility Model Content

[0004] This utility model provides an overpressure flow limiting structure for a diaphragm pump and a diaphragm pump. By integrating the traditional switch fixing base and cover into one piece, the number of parts is reduced, the composition of the overpressure flow limiting structure is simplified, and the volume of the overpressure flow limiting structure is reduced. This solves the problems of complex assembly process and high production cost of pressure regulating and flow limiting devices, and helps to realize the miniaturization of diaphragm pumps.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0006] A first aspect of this utility model provides an overpressure limiting structure for a diaphragm pump, the overpressure limiting structure for the diaphragm pump comprising:

[0007] The cover is provided with a switch receiving groove and a spring sleeve receiving groove;

[0008] A micro switch is disposed in a switch receiving slot;

[0009] The spring sleeve includes a spring mounting sleeve that is closed at the bottom and open at the top, and a pressure rod located on the side of the spring mounting sleeve. The pressure rod contacts the contacts of the micro switch. The spring mounting sleeve slides in the spring sleeve receiving groove.

[0010] The spring is inserted into the spring mounting sleeve from top to bottom;

[0011] A spring seat, fixed to the top of the spring;

[0012] The spring sleeve limiting member is a ring-shaped structure, fixed to the outer edge of the opening of the spring sleeve receiving groove; the closed end of the spring mounting sleeve passes through the central cavity of the spring sleeve limiting member and extends out of the spring sleeve limiting member; a slot is opened on the side wall of the spring sleeve limiting member, and the pressure rod of the spring sleeve extends out of the slot and slides up and down along the slot; and

[0013] The pressure adjusting screw is located on the cover and contacts the pressing spring seat.

[0014] According to the aforementioned diaphragm pump overpressure flow limiting structure, a positioning protrusion is provided on the outer edge of the opening of the spring sleeve receiving groove, and a positioning groove that cooperates with the positioning protrusion is provided on the spring sleeve limiting member; when the spring sleeve limiting member is fixed on the cover, the positioning protrusion is inserted into the positioning groove.

[0015] Furthermore, the outer edge of the opening of the spring sleeve receiving groove is provided with an arc-shaped protrusion, and the inner wall of the spring sleeve limiting member is provided with an arc-shaped groove that matches the arc-shaped protrusion; when the spring sleeve limiting member is fixed on the cover, the arc-shaped protrusion is inserted into the arc-shaped groove.

[0016] According to the aforementioned diaphragm pump overpressure limiting structure, the cover has a through threaded hole for the pressure adjusting screw to pass through, and the through threaded hole communicates with the spring sleeve receiving groove; the through threaded hole is threadedly connected to the pressure adjusting screw.

[0017] According to the aforementioned diaphragm pump overpressure limiting structure, the closed end of the spring mounting sleeve has an arc-shaped surface structure.

[0018] According to the aforementioned diaphragm pump overpressure limiting structure, the spring seat is a two-stage stepped frustum structure; the small-diameter cylindrical part of the spring seat is inserted into the first end of the spring; the bottom end of the pressure adjusting screw contacts and presses against the large-diameter cylindrical part of the spring seat; the second end of the spring is in the spring mounting sleeve.

[0019] According to the aforementioned diaphragm pump overpressure limiting structure, the spring mounting sleeve and the pressure rod are integrally formed.

[0020] According to the aforementioned diaphragm pump overpressure limiting structure, the spring sleeve receiving groove is shaped like a cylindrical hole, and the outer wall of the spring mounting sleeve is cylindrical.

[0021] A second aspect of this utility model is to provide a diaphragm pump, the diaphragm pump including a pump body and the diaphragm pump overpressure flow limiting structure described in the first aspect of this utility model;

[0022] The outlet channel of the pump body is connected to a pressure chamber with an upper opening. The upper opening of the pressure chamber is sealed by an elastic sealing gasket. The diaphragm pump overpressure limiting structure is installed on the pump body. The bottom end of the spring mounting sleeve is located on the upper surface of the elastic sealing gasket and is in contact with the elastic sealing gasket.

[0023] Furthermore, the overpressure limiting structure of the diaphragm pump is connected to the pump body via pump body screws.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The diaphragm pump overpressure limiting structure of this utility model eliminates the guide sleeve, switch fixing seat and base of the prior art. The cover is provided with switch receiving groove and spring sleeve receiving groove. The parts that match the shape are assembled according to the limit, which reduces the number of parts and improves the production and installation efficiency.

[0026] (2) The diaphragm pump overpressure limiting structure of this utility model adds a pressure rod to the outside of the spring mounting sleeve and cooperates with the groove on the spring sleeve limiting part, so that the spring sleeve can directly contact the micro switch in a smaller space, simplifying the complexity of the pressure feedback mechanism.

[0027] (3) In the diaphragm pump overpressure limiting structure of this utility model, the outer edge of the opening of the spring sleeve receiving groove is provided with a positioning protrusion, and the spring sleeve limiting part is provided with a positioning groove that cooperates with the positioning protrusion, so as to realize the positioning installation of the spring sleeve limiting part on the cover. The design of the positioning structure also provides a positioning function for the spring sleeve pressure rod to contact the contact of the micro switch.

[0028] (4) The top of the pump body of this utility model is designed with a cylindrical screw post, which makes it easy to quickly insert the overpressure limiting device into the pump body and position it conveniently. Since the volume of the overpressure limiting structure of the diaphragm pump is greatly reduced, the volume of the elastic sealing gasket is also reduced. In addition, the elastic sealing gasket is provided with a spherical groove, which can better match the closed end of the spring sleeve, increase the contact area, and improve the pressure feedback sensitivity. Attached Figure Description

[0029] Figure 1 A cross-sectional view of an existing overpressure flow-limiting structure;

[0030] Figure 2 This utility model presents a three-dimensional overpressure flow limiting structure for a diaphragm pump. Figure 1 ;

[0031] Figure 3 This utility model presents a three-dimensional overpressure flow limiting structure for a diaphragm pump. Figure 2 ;

[0032] Figure 4 This is an exploded view of the overpressure flow limiting structure of the diaphragm pump of this utility model;

[0033] Figure 5 This is a front view of the overpressure limiting structure of the diaphragm pump of this utility model;

[0034] Figure 6 for Figure 5 Sectional view along the middle AA direction;

[0035] Figure 7 A schematic diagram of the three-dimensional structure of the cover;

[0036] Figure 8 This is a three-dimensional structural diagram of the spring sleeve;

[0037] Figure 9 A three-dimensional structural diagram of the spring sleeve limiting component;

[0038] Figure 10 This is a front view of the diaphragm pump of this utility model;

[0039] Figure 11 for Figure 10 Sectional view along the BB direction;

[0040] Figure 12 for Figure 11 A cross-sectional view along the CC direction.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100. Diaphragm pump overpressure and flow limiting structure;

[0043] 1. Protective cover; 11. Switch receiving groove; 12. Spring sleeve receiving groove; 13. Positioning protrusion; 14. Arc-shaped protrusion; 15. Through threaded hole;

[0044] 2. Micro switch; 21. Contact;

[0045] 3. Spring sleeve; 31. Spring mounting sleeve; 32. Pressure rod;

[0046] 4. Spring;

[0047] 5. Spring seat;

[0048] 6. Spring sleeve limiting component; 61. Groove; 62. Positioning groove; 63. Arc-shaped groove;

[0049] 7. Adjusting screw;

[0050] 200. Pump body;

[0051] 201. Water outlet channel; 202. Pressure chamber; 203. Elastic sealing gasket; 204. Pump body screw. Detailed Implementation

[0052] To make the technical problem to be solved, the technical solution and advantages of this utility model clearer, the following will be described in conjunction with the accompanying drawings. Figures 2 to 12 The technical solution of this utility model is clearly and completely described in conjunction with specific embodiments.

[0053] Example 1:

[0054] This utility model embodiment provides an overpressure flow limiting structure for a diaphragm pump, such as... Figures 2 to 6 As shown, the overpressure limiting structure of the diaphragm pump includes a cover 1, a micro switch 2, a spring sleeve 3, a spring 4, a spring seat 5, a spring sleeve limiting component 6, and a pressure adjusting screw 7.

[0055] Specifically, the structure of the cover 1 is as follows: Figure 7 As shown, the cover 1 has a switch receiving groove 11 and a spring sleeve receiving groove 12. The spring sleeve receiving groove 12 is located at the center of the cover 1, and the switch receiving groove 11 is located on one side of the spring sleeve receiving groove 12. The micro switch 2 is disposed in the switch receiving groove 11.

[0056] In this utility model, the guide sleeve, switch fixing seat and base of the prior art are eliminated. The cover is provided with a switch receiving groove 11 and a spring sleeve receiving groove 12. The parts that match the shape are assembled according to the limit, which reduces the number of parts.

[0057] The structure of spring sleeve 3 is as follows Figure 8 As shown, the spring sleeve 3 includes a spring mounting sleeve 31 that is closed at the bottom and open at the top, and a pressure rod 32 located on the side of the spring mounting sleeve 31. The pressure rod 32 contacts the contact 21 of the micro switch 2. The spring mounting sleeve 31 slides within the spring sleeve receiving groove 12. The spring 4 is inserted into the spring mounting sleeve 31 from top to bottom. The spring seat 5 is fixed to the top of the spring 4.

[0058] The structure of the spring sleeve limiting component 6 is as follows Figure 9 As shown, the spring sleeve limiting member 6 is a ring structure, and the spring sleeve limiting member 6 is fixed to the outer edge of the opening of the spring sleeve receiving groove 12; the closed end of the spring mounting sleeve 31 passes through the central cavity of the spring sleeve limiting member 6 and extends out of the spring sleeve limiting member 6; the side wall of the spring sleeve limiting member 6 is provided with a slot 61, the pressure rod 32 of the spring sleeve 3 extends out of the slot 61 and slides up and down along the slot 61, and the pressure rod 32 extending out of the spring sleeve limiting member 6 contacts the contact 21 of the micro switch 2.

[0059] This invention simplifies the complexity of the pressure feedback mechanism by adding a pressure rod 32 to the outside of the spring mounting sleeve 31 and cooperating with the slot 61 on the spring sleeve limiting member 6, so that the spring sleeve 3 can directly contact the micro switch 2 in a smaller space.

[0060] The pressure adjusting screw 7 is located on the cover 1, and its bottom end contacts and presses against the top of the spring seat 5. By turning the pressure adjusting screw 7, the pre-compression of the spring 4 is adjusted, thereby adjusting the control accuracy of the diaphragm pump overpressure limiting structure.

[0061] To ensure the spring sleeve limiting member 6 is positioned and installed on the cover 1, a positioning protrusion 13 is provided on the outer edge of the opening of the spring sleeve receiving groove 12, and a positioning groove 62 is provided on the spring sleeve limiting member 6 to cooperate with the positioning protrusion 13. When the spring sleeve limiting member 6 is fixed on the cover 1, the positioning protrusion 13 is inserted into the positioning groove 62. The design of the positioning structure also provides a positioning function for the spring sleeve 3's pressure rod 32 to contact the contact 21 of the micro switch 2, eliminating the need for manual adjustment of the position of the spring sleeve 3's pressure rod 32, thus facilitating component installation.

[0062] The spring sleeve limiting member 6 may have one or more positioning grooves 62. Preferably, the spring sleeve limiting member 6 has one positioning groove 62, and the positioning groove 62 and the slot 61 are spaced apart on the ring of the spring sleeve limiting member 6. More preferably, the positioning groove 62 and the slot 61 are in a relative position; when the positioning groove 62 and the positioning protrusion 13 are engaged, the pressure rod 32 of the spring sleeve 3 contacts the contact 21 of the micro switch 2.

[0063] To ensure the stable installation of the spring sleeve limiting member 6 on the cover 1, an arc-shaped protrusion 14 is provided on the outer edge of the opening of the spring sleeve receiving groove 12, and an arc-shaped groove 63 is provided on the inner wall of the spring sleeve limiting member 6 to cooperate with the arc-shaped protrusion 14; when the spring sleeve limiting member 6 is fixed on the cover 1, the arc-shaped protrusion 14 is inserted into the arc-shaped groove 63.

[0064] To facilitate the installation of the pressure adjusting screw 7 on the cover 1, the cover 1 has a through threaded hole 15 for the pressure adjusting screw 7 to pass through. The through threaded hole 15 communicates with the spring sleeve receiving groove 12; the through threaded hole 15 is threadedly connected to the pressure adjusting screw 7.

[0065] Optionally, the closed end of the spring mounting sleeve 31 has an arc-shaped surface structure. Compared with the closed end of the spring mounting sleeve 31 having a planar structure, the closed end of the arc-shaped spring mounting sleeve 31 makes stable contact with the elastic sealing gasket 203 of the pump body 200, which can reduce the volume of the elastic sealing gasket 203 and realize the miniaturization of the diaphragm pump.

[0066] Specifically, the spring seat 5 has a two-stage stepped frustum structure; the small-diameter cylindrical part of the spring seat 5 is inserted into the first end of the spring 4; the bottom end of the adjusting screw 7 contacts and presses against the large-diameter cylindrical part of the spring seat 5; the second end of the spring 4 is in the spring mounting sleeve 31.

[0067] Specifically, the spring mounting sleeve 31 and the pressure rod 32 are integrally formed. The integrally formed spring sleeve 3 is easy to manufacture. In addition, the pressure rod 32 can also be fixedly connected to the spring mounting sleeve 31 by means of plugging, welding, etc.

[0068] Specifically, the spring sleeve receiving groove 12 is a cylindrical hole, and the outer wall of the spring mounting sleeve 31 is cylindrical. Alternatively, the spring sleeve receiving groove 12 is also a square hole, and the corresponding outer wall of the spring mounting sleeve 31 is square.

[0069] Assembly method of diaphragm pump overpressure limiting structure:

[0070] Install the spring seat 5 onto one end of the spring 4. Insert the end of the spring 4 with the spring seat 5 into the spring sleeve receiving groove 12 of the cover 1. Place the spring sleeve 3 onto the spring 4. Install the micro switch 2 into the switch receiving groove 11. The pressure rod 32 of the spring sleeve 3 contacts the contact 21 of the micro switch 2. Use the spring sleeve limiting member 6 to limit the spring sleeve 3, ensuring that the contact 21 of the micro switch 2 directly contacts the pressure rod 32 of the spring sleeve 3. After assembly, the micro switch 2 can function as a mechanical pressure switch. Furthermore, the assembly of a diaphragm pump overpressure current limiting structure eliminates the need for screw tightening, significantly improving production efficiency and further reducing costs.

[0071] Example 2:

[0072] This utility model embodiment provides a diaphragm pump, which includes a pump body 200 and an overpressure flow limiting structure 100 of the diaphragm pump of embodiment 1 of this utility model, such as... Figure 10 As shown.

[0073] like Figure 11 and Figure 12 As shown, the outlet side channel 201 of the pump body 200 is connected to a pressure chamber 202 with an upper opening. The upper opening of the pressure chamber 202 is sealed by an elastic sealing gasket 203. The diaphragm pump overpressure limiting structure 100 is installed on the pump body 200. The bottom end of the spring mounting sleeve 31 is located on the upper surface of the elastic sealing gasket 203 and is in contact with the elastic sealing gasket 203.

[0074] Furthermore, the diaphragm pump overpressure limiting structure 100 is connected to the pump body 200 via pump body screws 204. The top of the pump body is designed with cylindrical screw posts, allowing the overpressure limiting device to be quickly inserted into the pump body for easy positioning.

[0075] Because the volume of the overpressure limiting structure of the diaphragm pump is greatly reduced, the volume of the elastic sealing gasket is also reduced. Furthermore, the elastic sealing gasket 203 is provided with a spherical groove, which can better fit with the closed end of the spring sleeve 3, increasing the contact area and improving the pressure feedback sensitivity.

[0076] Working principle:

[0077] When the water pressure in the outlet pipe reaches a certain value, the high-pressure liquid in the pressure chamber 202 exerts upward pressure on the elastic sealing gasket 203, causing it to deform upward and push the spring sleeve 3 upward a certain distance. The pressure rod 32 of the spring sleeve 3 presses the contact 21 of the micro switch 2, causing the circuit to disconnect and the motor to stop running. The water pressure in the outlet pipe is then limited to a certain range to prevent damage to the equipment. When the blockage is cleared, the water pressure in the outlet pipe decreases, the pressure in the pressure chamber 202 decreases, and the elastic sealing gasket 203 and spring sleeve 3 reset under the pressure of the spring 4. The contact 21 of the micro switch 2 also resets, and the motor restarts.

[0078] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0079] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solutions of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model.

Claims

1. A diaphragm pump overpressure flow limiting structure, characterized in that, include: The cover (1) is provided with a switch receiving groove (11) and a spring sleeve receiving groove (12); A micro switch (2) is disposed in a switch receiving slot (11); The spring sleeve (3) includes a spring mounting sleeve (31) that is closed at the bottom and open at the top and a pressure rod (32) located on the side of the spring mounting sleeve (31). The pressure rod (32) contacts the contact (21) of the micro switch (2). The spring mounting sleeve (31) slides in the spring sleeve receiving groove (12). The spring (4) is inserted into the spring mounting sleeve (31) from top to bottom; Spring seat (5) is fixed to the top of spring (4); The spring sleeve limiting member (6) is a ring-shaped structure, fixed to the outer edge of the opening of the spring sleeve receiving groove (12); the closed end of the spring mounting sleeve (31) passes through the central cavity of the spring sleeve limiting member (6) and extends out of the spring sleeve limiting member (6); the side wall of the spring sleeve limiting member (6) has a slot (61), and the pressure rod (32) of the spring sleeve (3) extends out of the slot (61) and slides up and down along the slot (61); and The pressure adjusting screw (7) is set on the cover (1) and contacts the pressing spring seat (5).

2. The diaphragm pump overpressure limiting structure according to claim 1, characterized in that, The outer edge of the opening of the spring sleeve receiving groove (12) is provided with a positioning protrusion (13), and the spring sleeve limiting member (6) is provided with a positioning groove (62) that cooperates with the positioning protrusion (13); when the spring sleeve limiting member (6) is fixed on the cover (1), the positioning protrusion (13) is inserted into the positioning groove (62).

3. The diaphragm pump overpressure limiting structure according to claim 2, characterized in that, The outer edge of the opening of the spring sleeve receiving groove (12) is provided with an arc-shaped protrusion (14), and the inner wall of the spring sleeve limiting member (6) is provided with an arc-shaped groove (63) that matches the arc-shaped protrusion (14); when the spring sleeve limiting member (6) is fixed on the cover (1), the arc-shaped protrusion (14) is inserted into the arc-shaped groove (63).

4. The diaphragm pump overpressure flow limiting structure according to claim 1, characterized in that, The cover (1) has a through threaded hole (15) through which the pressure adjusting screw (7) passes. The through threaded hole (15) is connected to the spring sleeve receiving groove (12). The through threaded hole (15) is threadedly connected to the pressure adjusting screw (7).

5. The diaphragm pump overpressure flow limiting structure according to claim 1, characterized in that, The closed end of the spring mounting sleeve (31) has an arc-shaped surface structure.

6. The diaphragm pump overpressure flow limiting structure according to claim 1, characterized in that, The spring seat (5) is a two-stage stepped frustum structure; the small-diameter cylindrical part of the spring seat (5) is inserted into the first end of the spring (4); the bottom end of the adjusting screw (7) contacts and presses against the large-diameter cylindrical part of the spring seat (5); the second end of the spring (4) is in the spring mounting sleeve (31).

7. The diaphragm pump overpressure limiting structure according to claim 1, characterized in that, The spring mounting sleeve (31) and the pressure rod (32) are integrally formed structures.

8. The diaphragm pump overpressure flow limiting structure according to claim 1, characterized in that, The spring sleeve receiving groove (12) is cylindrical, and the outer wall of the spring mounting sleeve (31) is cylindrical.

9. A diaphragm pump, characterized in that, Includes a pump body (200) and a diaphragm pump overpressure limiting structure (100) as described in any one of claims 1 to 8. The outlet side channel (201) of the pump body (200) is connected to a pressure chamber (202) with an upper opening. The upper opening of the pressure chamber (202) is sealed by an elastic sealing gasket (203). The diaphragm pump overpressure limiting structure (100) is installed on the pump body (200). The bottom end of the spring mounting sleeve (31) is located on the upper surface of the elastic sealing gasket (203) and is in contact with the elastic sealing gasket (203).

10. The diaphragm pump according to claim 9, characterized in that, The diaphragm pump overpressure limiting structure (100) is connected to the pump body (200) by pump body screws (204).

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