A pressure switch

Abstract

The utility model provides a pressure switch, which belongs to the technical field of pressure switches. It solves the problem that the existing pressure switch is difficult to adjust. The pressure switch includes a housing, a pressure regulating screw, a pressure differential screw, a pressure regulating limit plate and a fastener. A pressure regulating spring and a pressure differential spring are arranged in the housing. The rod of the pressure regulating screw extends into the housing and is pressed and matched with the pressure regulating spring. The rod of the pressure differential screw extends into the housing and is pressed or stretched and matched with the pressure differential spring. The head of the pressure regulating screw and the head of the pressure differential screw are both located outside the housing. The pressure regulating limit plate has a fixed hole, a first wrench hole capable of rotating the head of the pressure regulating screw and a second wrench hole capable of rotating the head of the pressure differential screw. When the fastener passes through the fixed hole and is inserted into the housing to fix the pressure regulating limit plate and the housing, the head of the pressure regulating screw is inserted into the first wrench hole, and the head of the pressure differential screw is inserted into the second wrench hole. The pressure switch has the advantages of convenient adjustment and limiting.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure switches and relates to a pressure switch. Background Art

[0002] A pressure switch, also known as a pressure sensor or pressure controller, is an automated device that controls the on / off of a circuit by detecting changes in pressure in the system. The working principle of a pressure switch is that when the measured pressure reaches a preset value, the pressure sensing element (such as a diaphragm, bellows, piston, etc.) will be displaced or deformed, and then through mechanical transmission or electrical signal conversion, the switch component will be triggered, thereby controlling the opening or closing of the circuit, and realizing the monitoring and control of the system pressure.

[0003] Existing pressure switches, for example, Chinese patent literature discloses a pressure controller [patent number: 201520446214.1; authorization announcement number: CN204696034U], which includes a shell, a cover, a protective cover and a base. The shell is provided with a switch assembly, a mounting frame, a pressure indicating plate and a moving plate. The outer shell of the mounting frame is provided with a pressure regulating spring. The socket assembly includes a joint, a connector and a bellows. The joint, the connector and the bellows cooperate to form a cavity. The bellows is arranged in the shell and abuts against the pressure regulating spring. An adjusting screw is arranged on the base, the adjusting screw is inserted into the shell and pressed with the pressure regulating spring. The protective cover is placed outside the base and cooperates with the base to form a accommodating protection cavity for accommodating the adjusting screw.

[0004] The pressure controller of this structure adjusts the elastic force of the pressure regulating spring by adjusting the screw, and adjusts the elastic force of the pressure differential spring by the pressure differential screw. The heads of the adjusting screw and the pressure differential spring are both located outside the base, and a protective cover is placed outside the base and cooperates with the base to form a accommodating protection cavity for accommodating the heads of the adjusting screw and the pressure differential spring, so that there is no problem of misoperation of the adjusting screw and the pressure differential spring. However, when adjusting the pressure controller of this structure, the protective cover needs to be removed, and then an additional tool is needed to turn the adjusting screw and the pressure differential spring. After the adjustment is completed, the protective cover is installed again, which makes the adjustment troublesome. Summary of the invention

[0005] The utility model aims to solve the above problems in the prior art and proposes a pressure switch, which solves the technical problem of how to facilitate the adjustment and limit of the pressure switch.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a pressure switch, comprising a shell, a pressure-regulating screw and a pressure differential screw, the shell being provided with a pressure-regulating spring and a pressure differential spring, the rod of the pressure-regulating screw extending into the shell and being pressed and fitted with the pressure-regulating spring, the rod of the pressure differential screw extending into the shell and being pressed or stretched and fitted with the pressure differential spring, the head of the pressure-regulating screw and the head of the pressure differential screw being both located outside the shell, characterized in that the pressure switch also includes a pressure-regulating limit plate and a fastener, the pressure-regulating limit plate having a fixing hole, a first wrench hole for rotating the head of the pressure-regulating screw and a second wrench hole for rotating the head of the pressure differential screw, when the fastener passes through the fixing hole and is penetrated into the shell to fix the pressure-regulating limit plate and the shell together, the head of the pressure-regulating screw is penetrated into the first wrench hole, and the head of the pressure differential screw is penetrated into the second wrench hole.

[0007] After the pressure switch is produced, it is necessary to adjust the elastic force of the pressure regulating spring and the differential pressure spring, that is, the pressure value and differential pressure value at the factory. After the adjustment is completed, the first wrench hole is sleeved on the outside of the head of the pressure regulating screw, and the second wrench hole is sleeved on the outside of the head of the differential pressure screw, and then the fastener is passed through the fixing hole to fix the pressure regulating limit plate to the shell, thereby limiting the position of the pressure regulating screw and the differential pressure screw, so that the pressure regulating screw and the differential pressure screw cannot rotate, ensuring that the pressure value and differential pressure value of the pressure switch are always the factory value. When adjustment is needed, loosen the fastener, remove the pressure regulating limit plate, turn the pressure regulating screw through the first wrench hole to adjust the pressure value of the pressure regulating spring, turn the pressure differential screw through the second wrench hole to adjust the pressure differential value of the pressure differential spring, so that the pressure switch is easy to adjust; after the adjustment is completed, you only need to put the first wrench hole on the outside of the head of the pressure regulating screw again, put the second wrench hole on the outside of the head of the pressure differential screw, and then use the fasteners to fix the pressure regulating limit plate and the shell, so that the pressure regulating screw is limited circumferentially, the pressure differential screw is limited circumferentially, and the pressure switch is easy to limit.

[0008] In the above-mentioned pressure switch, the pressure regulating limit plate has a protrusion, and when the pressure regulating limit plate is attached to and fixed to the housing, the protrusion is arranged outside the edge of the housing. In this structure, the protrusion is used for the operator to hold, so that the pressure regulating limit plate is easy to take and put, thereby facilitating the adjustment and limiting of the pressure switch.

[0009] In the above-mentioned pressure switch, the housing has a groove, and the pressure regulating limit plate, the head of the pressure regulating screw and the head of the pressure differential screw are all located in the groove. The setting of the groove makes the pressure regulating limit plate, the head of the pressure regulating screw and the head of the pressure differential screw relatively indented, so that the pressure switch has a stronger overall sense and the local structure does not protrude too much.

[0010] In the above-mentioned pressure switch, the pressure regulating limit plate is in the shape of a flat plate, and the pressure regulating limit plate is attached to the outer wall of the shell. This structure makes the pressure regulating limit plate fit the shell better, so that the setting of the pressure regulating limit plate will not affect the normal use of the pressure switch.

[0011] In the above-mentioned pressure switch, the first wrench hole and the second wrench hole are respectively located in the ends of the pressure regulating limit plate at both ends along the length direction. This structure uses the lever principle to enable the pressure regulating limit plate to better turn the pressure regulating screw and the pressure differential screw, saving effort.

[0012] In the above-mentioned pressure switch, the fixing hole is located in the middle of the first wrench hole and the second wrench hole. The design is reasonable, so that the pressure regulating limit plate is firmly connected.

[0013] In the above-mentioned pressure switch, the pressure switch also includes a pressure regulating nut located in the housing, the pressure regulating nut is threadedly connected to the pressure regulating screw, the pressure regulating spring acts on the pressure regulating nut, the pressure regulating nut has a protruding pressure regulating indicator rod, the housing has a long strip-shaped pressure value groove, the outer end of the pressure regulating indicator rod is embedded in the pressure value groove so that the pressure regulating nut and the housing are circumferentially limited, and the pressure regulating indicator rod can move along the pressure value groove. In this structure, when the pressure regulating screw is rotated, the axial position of the pressure regulating screw remains unchanged, and the pressure value of the pressure regulating spring is changed by changing the axial position of the pressure regulating nut, which is a reasonable design.

[0014] In the above-mentioned pressure switch, the pressure switch also includes a pressure differential nut located in the housing, the pressure differential nut is threadedly connected to the pressure differential screw, the pressure differential spring acts on the pressure differential nut, the pressure differential nut has a protruding pressure differential indicator rod, the housing has a long strip-shaped pressure differential value groove, the outer end of the pressure differential indicator rod is embedded in the pressure differential value groove so that the pressure differential nut and the housing are circumferentially limited, and the pressure differential indicator rod can move along the pressure differential value groove. In this structure, when the pressure differential screw is rotated, the axial position of the pressure differential screw remains unchanged, and the pressure differential value of the pressure differential spring is changed by changing the axial position of the pressure differential nut, which is a reasonable design.

[0015] In the above-mentioned pressure switch, the pressure switch also includes a rocker arm, a bellows, a spring seat, a lever frame and a connecting frame, all of which are located in the shell, the rocker arm is hinged in the shell, the lever frame is fixedly connected to the shell, the pressure regulating spring is located in the spring seat, one end of the spring seat rests on the bellows under the action of the pressure regulating spring, and the other end is connected to one end of the rocker arm, one end of the connecting frame is connected to the other end of the rocker arm, the other end of the connecting frame is connected to the pressure differential spring, and the middle of the connecting frame is connected to the lever frame.

[0016] In the above-mentioned pressure switch, the pressure switch also includes a moving contact piece, a stationary contact piece and a wiring assembly all located in the shell, the stationary contact piece is electrically connected to the wiring assembly, the other end of the rocker arm is fixedly connected to a partition bar, the moving contact piece elastically rests on the partition bar, and the rocker arm drives the partition bar to move so that the moving contact piece and the stationary contact piece can contact or separate from each other.

[0017] Compared with the prior art, the pressure switch provided by the utility model has the following advantages:

[0018] 1. When adjusting the pressure switch, loosen the fasteners, remove the pressure regulating limit plate, turn the pressure regulating screw through the first wrench hole to adjust the pressure value of the pressure regulating spring, turn the pressure differential screw through the second wrench hole to adjust the pressure differential value of the pressure differential spring, so that the pressure switch can be adjusted conveniently.

[0019] 2. When the pressure switch is limited, it is only necessary to put the first wrench hole on the outside of the head of the pressure regulating screw, and the second wrench hole on the outside of the head of the differential pressure screw, and then fasten the pressure regulating limit plate and the shell together through fasteners, so that the pressure regulating screw is limited circumferentially, the differential pressure screw is limited circumferentially, and the pressure switch is convenient to limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the pressure switch.

[0021] Figure 2 It is a schematic diagram of the overall structure of the pressure regulating limit plate of the pressure switch.

[0022] Figure 3 This is the internal structure of the pressure switch Figure 1 .

[0023] Figure 4 This is the internal structure of the pressure switch Figure 2 .

[0024] In the figure, 1, housing; 2, pressure-adjusting screw; 3, differential pressure screw; 4, pressure-adjusting spring; 5, differential pressure spring; 6, pressure-adjusting limit plate; 61, fixing hole; 62, first wrench hole; 63, second wrench hole; 64, protrusion; 7, fastener; 8, groove; 9, pressure-adjusting nut; 10, pressure-adjusting indicator rod; 11, pressure value slot; 12, differential pressure nut; 13, differential pressure indicator rod; 14, differential pressure slot; 15, rocker arm; 16, bellows; 17, spring seat; 18, lever frame; 19, connecting frame; 20, moving contact piece; 21, stationary contact piece; 22, wiring assembly; 23, spacer. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] like Figure 1 , Figure 3 , Figure 4 As shown, the pressure switch includes a housing 1, a pressure regulating screw 2, a differential pressure screw 3, a pressure regulating spring 4, a differential pressure spring 5, a pressure regulating limit plate 6, a fastener 7, a pressure regulating nut 9, a pressure regulating indicating rod 10, a differential pressure nut 12, a differential pressure indicating rod 13, a rocker arm 15, a bellows 16, a spring seat 17, a lever frame 18, a connecting frame 19, a moving contact piece 20, a stationary contact piece 21, a wiring assembly 22 and a spacer 23. The pressure regulating spring 4, the differential pressure spring 5, the pressure regulating nut 9, the pressure regulating indicating rod 10, the differential pressure nut 12, the differential pressure indicating rod 13, the rocker arm 15, the bellows 16, the spring seat 17, the lever frame 18, the connecting frame 19, the moving contact piece 20, the stationary contact piece 21, the wiring assembly 22 and the spacer 23 are all located in the housing 1.

[0027] The rod of the pressure regulating screw 2 extends into the housing 1 and is pressed and matched with the pressure regulating spring 4, and the head of the pressure regulating screw 2 is located outside the housing 1. The pressure regulating nut 9 is threadedly connected with the pressure regulating screw 2, and the pressure regulating spring 4 acts on the pressure regulating nut 9. The pressure regulating nut 9 has a protruding pressure regulating indicator rod 10, and the housing 1 has a long strip-shaped pressure value groove 11. The outer end of the pressure regulating indicator rod 10 is embedded in the pressure value groove 11 so that the pressure regulating nut 9 and the housing 1 are circumferentially limited, and the pressure regulating indicator rod 10 can move along the pressure value groove 11.

[0028] In this embodiment, the rod of the pressure differential screw 3 extends into the housing 1 and is stretched and matched with the pressure differential spring 5, and the head of the pressure differential screw 3 is located outside the housing 1. In actual production, the rod of the pressure differential screw 3 extends into the housing 1 and is pressed and matched with the pressure differential spring 5. The pressure differential nut 12 is threadedly connected with the pressure differential screw 3, and the pressure differential spring 5 acts on the pressure differential nut 12. The pressure differential nut 12 has a protruding pressure differential indicator rod 13, and the housing 1 has a long strip-shaped pressure differential value groove 14. The outer end of the pressure differential indicator rod 13 is embedded in the pressure differential value groove 14 to limit the pressure differential nut 12 and the housing 1 circumferentially, and the pressure differential indicator rod 13 can move along the pressure differential value groove 14.

[0029] like Figure 2As shown, the pressure regulating limit plate 6 is in the shape of a flat plate, and is provided with a fixing hole 61, a first wrench hole 62 capable of rotating the head of the pressure regulating screw 2, and a second wrench hole 63 capable of rotating the head of the differential pressure screw 3. The first wrench hole 62 and the second wrench hole 63 are respectively located in the ends of the pressure regulating limit plate 6 at both ends along the length direction, and the fixing hole 61 is located in the middle of the first wrench hole 62 and the second wrench hole 63. The pressure regulating limit plate 6 is provided with a protrusion 64. When the fastener 7 passes through the fixing hole 61 and is inserted into the housing 1 to fix the pressure regulating limit plate 6 and the housing 1, the head of the pressure regulating screw 2 is inserted into the first wrench hole 62, the head of the differential pressure screw 3 is inserted into the second wrench hole 63, the pressure regulating limit plate 6 is abutted against the outer wall of the housing 1, and the protrusion 64 is protruding outside the edge of the housing 1. The housing 1 has a groove 8, and the pressure regulating limit plate 6, the head of the pressure regulating screw 2 and the head of the pressure differential screw 3 are all located in the groove 8. In this embodiment, the fastener 7 is a bolt, and in actual production, the fastener 7 can be a screw.

[0030] The rocker arm 15 is hinged in the housing 1, the lever frame 18 is fixed in the housing 1, the pressure regulating spring 4 is located in the spring seat 17, one end of the spring seat 17 abuts against the bellows 16 under the action of the pressure regulating spring 4, and the other end is connected to one end of the rocker arm 15, one end of the connecting frame 19 is connected to the other end of the rocker arm 15, the other end of the connecting frame 19 is connected to the pressure difference spring 5, and the middle of the connecting frame 19 is connected to the lever frame 18. The stationary contact piece 21 is electrically connected to the wiring assembly 22, the other end of the rocker arm 15 is fixed with a spacer bar 23, the moving contact piece 20 elastically abuts against the spacer bar 23, and the rocker arm 15 drives the spacer bar 23 to move to make the moving contact piece 20 and the stationary contact piece 21 contact or separate.

[0031] When adjustment is required, loosen the fastener 7, remove the pressure regulating limit plate 6, rotate the pressure regulating screw 2 through the first wrench hole 62 to adjust the pressure value of the pressure regulating spring 4, and rotate the pressure differential screw 3 through the second wrench hole 63 to adjust the pressure differential value of the pressure differential spring 5. After the adjustment is completed, it is only necessary to cover the first wrench hole 62 on the outside of the head of the pressure regulating screw 2 again, cover the second wrench hole 63 on the outside of the head of the pressure differential screw 3, and then fix the pressure regulating limit plate 6 and the housing 1 together through the fastener 7.

[0032] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0033] Although this article uses more terms such as housing 1, pressure regulating screw 2, differential pressure screw 3, pressure regulating spring 4, differential pressure spring 5, pressure regulating limit plate 6, fixing hole 61, first spanner hole 62, second spanner hole 63, protrusion 64, fastener 7, groove 8, pressure regulating nut 9, pressure regulating indicator rod 10, pressure value slot 11, differential pressure nut 12, differential pressure indicator rod 13, differential pressure slot 14, rocker arm 15, bellows 16, spring seat 17, lever frame 18, connecting frame 19, moving contact piece 20, stationary contact piece 21, wiring assembly 22, spacer 23, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A pressure switch, comprising a housing (1), a pressure regulating screw (2) and a pressure differential screw (3), wherein a pressure regulating spring (4) and a pressure differential spring (5) are provided in the housing (1), the rod of the pressure regulating screw (2) extends into the housing (1) and is pressed and matched with the pressure regulating spring (4), the rod of the pressure differential screw (3) extends into the housing (1) and is pressed or stretched and matched with the pressure differential spring (5), the head of the pressure regulating screw (2) and the head of the pressure differential screw (3) are both located outside the housing (1), characterized in that: The pressure switch also includes a pressure regulating limit plate (6) and a fastener (7). The pressure regulating limit plate (6) has a fixing hole (61), a first wrench hole (62) capable of rotating the head of the pressure regulating screw (2), and a second wrench hole (63) capable of rotating the head of the pressure differential screw (3). When the fastener (7) passes through the fixing hole (61) and is inserted into the housing (1) so that the pressure regulating limit plate (6) and the housing (1) are fixedly connected, the head of the pressure regulating screw (2) is inserted into the first wrench hole (62), and the head of the pressure differential screw (3) is inserted into the second wrench hole (63).

2. A pressure switch according to claim 1, characterized in that: The pressure regulating limit plate (6) has a protrusion (64), and when the pressure regulating limit plate (6) is abutted and fixedly connected to the shell (1), the protrusion (64) is arranged to protrude outside the edge of the shell (1).

3. A pressure switch according to claim 1, characterized in that: The housing (1) is provided with a groove (8), and the pressure regulating limit plate (6), the head of the pressure regulating screw (2) and the head of the pressure differential screw (3) are all located in the groove (8).

4. A pressure switch according to claim 1, 2 or 3, characterized in that: The pressure regulating limit plate (6) is in the shape of a flat plate, and the pressure regulating limit plate (6) is attached to the outer side wall of the shell (1).

5. A pressure switch according to claim 1, 2 or 3, characterized in that: The first wrench hole (62) and the second wrench hole (63) are respectively located at the ends of the pressure regulating and limiting plate (6) at both ends along the length direction.

6. A pressure switch according to claim 1, 2 or 3, characterized in that: The fixing hole (61) is located in the middle of the first wrench hole (62) and the second wrench hole (63).

7. A pressure switch according to claim 1, 2 or 3, characterized in that: The pressure switch also includes a pressure regulating nut (9) located in the housing (1), the pressure regulating nut (9) being threadedly connected to the pressure regulating screw (2), the pressure regulating spring (4) acting on the pressure regulating nut (9), the pressure regulating nut (9) having a protruding pressure regulating indicating rod (10), the housing (1) having a long strip-shaped pressure value groove (11), the outer end of the pressure regulating indicating rod (10) being embedded in the pressure value groove (11) so that the pressure regulating nut (9) and the housing (1) are circumferentially limited, and the pressure regulating indicating rod (10) can move along the pressure value groove (11).

8. A pressure switch according to claim 1, 2 or 3, characterized in that: The pressure switch also includes a pressure differential nut (12) located in the housing (1), the pressure differential nut (12) being threadedly connected to the pressure differential screw (3), the pressure differential spring (5) acting on the pressure differential nut (12), the pressure differential nut (12) having a protruding pressure differential indicating rod (13), the housing (1) having a long strip-shaped pressure differential value groove (14), the outer end of the pressure differential indicating rod (13) being embedded in the pressure differential value groove (14) so ​​that the pressure differential nut (12) and the housing (1) are circumferentially limited, and the pressure differential indicating rod (13) can move along the pressure differential value groove (14).

9. A pressure switch according to claim 1, 2 or 3, characterized in that: The pressure switch also includes a rocker arm (15), a bellows (16), a spring seat (17), a lever frame (18) and a connecting frame (19) all located in the housing (1); the rocker arm (15) is hinged in the housing (1); the lever frame (18) is fixedly connected to the housing (1); the pressure regulating spring (4) is located in the spring seat (17); one end of the spring seat (17) abuts against the bellows (16) under the action of the pressure regulating spring (4); the other end is connected to one end of the rocker arm (15); one end of the connecting frame (19) is connected to the other end of the rocker arm (15); the other end of the connecting frame (19) is connected to the pressure differential spring (5); and the middle of the connecting frame (19) is connected to the lever frame (18).

10. A pressure switch according to claim 9, characterized in that: The pressure switch also includes a moving contact piece (20), a stationary contact piece (21) and a wiring assembly (22) all located in the housing (1); the stationary contact piece (21) is electrically connected to the wiring assembly (22); the other end of the rocker arm (15) is fixedly connected to a partition bar (23); the moving contact piece (20) elastically abuts against the partition bar (23); the rocker arm (15) drives the partition bar (23) to move so that the moving contact piece (20) and the stationary contact piece (21) are in contact with or separated from each other.

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