A diaphragm pump for preventing frequent operation of pressure switch

Abstract

The present invention discloses a diaphragm pump for preventing a pressure switch from frequently operating, comprising a pump head, a valve seat, a pressure switch and a check valve assembly; the pump head is installed on one side of the valve seat, and the pressure switch is installed on the pump head; a water outlet channel and a water outlet cavity are provided on the pump head, and a mounting cavity is provided in the water outlet cavity; an end of the mounting cavity close to the valve seat has an opening connected to the water outlet cavity, a check valve assembly is installed at the opening, the check valve assembly is pressed and fixed by the pump head and the valve seat, and the other end of the mounting cavity has a detection flow channel directly connected to the detection end of the pressure switch, and the two ends of the mounting cavity are connected to the water outlet channel. The water in the detection flow channel can directly flow into the detection end, and when the pressure switch is powered on and heated when working, the water can play a cooling role, thereby effectively extending the service life of the pressure switch, improving the service life of the diaphragm pump, and improving the reliability of the product.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm pumps, in particular to a diaphragm pump capable of preventing a pressure switch from frequently operating. Background Art

[0002] The diaphragm pump relies on the back and forth movement of the diaphragm to change the volume of its working chamber, thereby achieving the suction and discharge of fluid. When the diaphragm pump is working normally, it will continuously transport fluid from its inlet to its outlet; when the outlet of the diaphragm pump is blocked, the pressure of the diaphragm pump and its inlet will continue to increase; based on this, the existing diaphragm pump will be equipped with a pressure switch to detect the pressure at the outlet, which can realize the automatic start of the diaphragm pump when the pressure is low, which is convenient for use, and the automatic stop of the diaphragm pump when the pressure is high, realizing overpressure protection of the diaphragm pump.

[0003] For example, the large-flow electric diaphragm pump disclosed in Chinese patent CN 203272082 U has a pressure switch at the outer end of the pump head to detect the pressure of the cavity inside the pump head, and can control the start and stop of the electric diaphragm pump according to the pressure change. However, the pressure switch of this solution directly detects the pressure inside the pump head, and the pressure inside the cavity is prone to internal leakage, which will cause unexpected pressure changes, causing the pressure switch to trip frequently, resulting in frequent startup of the electric diaphragm pump, and difficulty in normal operation.

[0004] Therefore, in order to prevent frequent tripping, some diaphragm pumps are equipped with a check valve assembly at the outlet to enable the pressure switch to detect the pressure at the outlet to avoid being affected by the cavity. For example, the pressure protection mechanism of the diaphragm pump disclosed in Chinese patent CN 218293816 U; in this scheme, when working, the check valve body ejector pushes against the sealing diaphragm to touch the contact of the micro switch to realize the function of the pressure switch.

[0005] However, the pressure switch (touch switch) in this solution will carry a large current when working, generate heat continuously, and easily burn out over time, resulting in a short service life of the diaphragm pump. Summary of the invention

[0006] The object of the present invention is to provide a diaphragm pump which can prevent a pressure switch from being frequently actuated, and has the advantage of increasing the service life of the product.

[0007] In order to achieve the above object, the solution of the present invention is:

[0008] A diaphragm pump for preventing a pressure switch from frequently operating comprises a pump head, a valve seat, a pressure switch and a check valve assembly; the pump head is mounted on one side of the valve seat, and the pressure switch is mounted on the pump head; a water outlet channel and a water outlet cavity are provided on the pump head, and a mounting cavity is provided in the water outlet cavity;

[0009] One end of the installation cavity close to the valve seat has an opening connected to the water outlet cavity, and the check valve assembly is installed at the opening. The other end of the installation cavity has a detection flow channel, which is directly connected to the detection end of the pressure switch. The two ends of the installation cavity are connected to the water outlet channel.

[0010] The check valve assembly comprises a check valve body, a check elastic member and a check valve seat;

[0011] The check valve seat is installed at the opening of the installation cavity, and a check through hole is provided in the middle of the check valve seat. An abutment ring is provided on the outer periphery of the check through hole. One side of the abutment ring is pressed and sealed by the edge of the opening of the installation cavity, and the other side abuts the valve seat. The side of the abutment ring close to the valve seat also has a conducting flow channel connecting the check through hole and the water outlet cavity.

[0012] The check valve body and the check elastic member are both installed in the installation cavity, and the check elastic member presses against the check valve body to elastically seal the check through hole.

[0013] Furthermore, the pressure switch is a differential pressure switch.

[0014] Furthermore, the water outlet chamber and the installation chamber are formed on one side of the pump head close to the valve seat, and a detection chamber connected to the detection channel is formed on the other side; the pressure switch is installed on the other side of the pump head, and the detection end of the pressure switch is inserted and installed in the detection chamber to seal the detection chamber.

[0015] Furthermore, the detection channel is arranged in the side wall between the installation cavity and the detection cavity, and includes a first flow channel and a second flow channel which are interconnected and circular, the first flow channel is connected to the installation cavity, the second flow channel is connected to the detection cavity, and the aperture of the first flow channel is larger than the aperture of the second flow channel.

[0016] Furthermore, the side of the check valve body away from the check through hole is provided with a valve stem; and the installation cavity is provided with a guide groove for the valve stem to be inserted.

[0017] Furthermore, the side of the check through hole close to the check valve body is an outwardly expanded tapered hole.

[0018] Furthermore, a check valve sealing ring is provided on the peripheral wall of the check valve body.

[0019] Furthermore, the middle part of the check valve seat has an insert boss, the insert boss is inserted into the opening of the installation cavity, and a boss sealing ring is provided on the peripheral wall of the insert boss; the middle part of the insert boss is the check through hole.

[0020] Furthermore, the valve seat has a plurality of circumferentially spaced water outlets on one side facing the water outlet chamber of the pump head, and a water outlet valve plate is provided at the water outlet; the abutment ring of the check valve seat has a plurality of abutment portions circumferentially spaced around the check through hole on the side close to the valve seat, the number of the abutment portions corresponds to the number of the water outlet valve plates, and each abutment portion abuts respectively between circumferentially adjacent water outlet valve plates on the valve seat, and the conducting flow channel is formed between the circumferentially adjacent abutment portions; the conducting flow channel has space for the water outlet valve plate to move.

[0021] Furthermore, the pump head has a plurality of abutment columns protruding toward the valve seat, each abutment column corresponds to each water outlet valve plate and is used to press and fix the water outlet valve plate.

[0022] After adopting the above technical scheme, first of all, it has the advantages of convenient assembly and convenient production. During installation, the check elastic member and the check valve body can be installed into the installation cavity first, and then the check valve seat can be set at the opening of the installation cavity, and then the pump head can be fixed to the valve seat, so that the check valve seat can be pressed by the edge of the installation cavity opening and the valve seat. That is, the check valve seat can be fixed by assembling the pump head and the valve seat, and there is no need to lock or screw the check valve seat additionally, so that the assembly of the check valve assembly can be completed conveniently and quickly; secondly, the detection flow channel is connected with the water outlet channel through the installation cavity, and directly It is connected to the detection end of the pressure switch, and the check valve assembly can unidirectionally conduct the water outlet chamber and the water outlet channel, so that the pressure switch can directly detect the water pressure changes in the water outlet channel, automatically and accurately control the start and stop actions of the diaphragm pump, and is not affected by the water outlet chamber. It can effectively solve the problem of frequent jumping of the pressure switch when the water outlet chamber is depressurized; and the water in the detection flow channel can directly flow into the detection end. When the pressure switch is working, it is powered on and generates heat, and the water can play a cooling role, thereby effectively extending the service life of the pressure switch, increasing the service life of the diaphragm pump, and improving the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of an embodiment of the present invention;

[0024] Figure 2 A side view of an embodiment of the present invention;

[0025] Figure 3 for Figure 2 Sectional view at AA;

[0026] Figure 4 for Figure 3 Stereoscopic view of

[0027] Figure 5 An exploded view of an embodiment of the present invention;

[0028] Figure 6 A partial structural exploded view of an embodiment of the present invention.

[0029] Explanation of reference numerals: horizontal pump body 1, bracket 2, diaphragm 3, valve seat 4, water outlet 41, water outlet valve plate 42, pump head 5, water outlet channel 51, water outlet chamber 52, installation chamber 53, opening 531, detection channel 532, first channel 533, second channel 534, guide groove 535, guide column 536, detection chamber 54, water inlet chamber 55, pressure switch cover 56, abutment column 57, pressure switch 6, detection end 61, sealing ring 62, check valve assembly 7, check valve body 71, valve stem 711, check valve sealing ring 712, check elastic member 72, check valve seat 73, check through hole 731, abutment ring 732, conducting channel 733, tapered hole 734, plug-in boss 736, boss sealing ring 737, abutment portion 738. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] like Figures 1 to 6 As shown, a diaphragm pump for preventing a pressure switch from frequently operating according to the present invention is shown.

[0032] like Figure 5 The diaphragm pump may include a horizontal pump body 1, a bracket 2, a diaphragm 3, a valve seat 4, a pump head 5, a pressure switch 6 and a check valve assembly 7; the bracket 2, the diaphragm 3, the valve seat 4 and the pump head 5 are installed in sequence at one lateral end of the horizontal pump body 1 to realize the water pumping function of a conventional diaphragm pump.

[0033] The horizontally placed pump body 1 , the bracket 2 and the diaphragm 3 may adopt conventional structures, and the main improvements of the present invention are in the pump head 5 and the valve seat 4 .

[0034] Specifically, the pump head 5 is installed on one side of the valve seat 4 , and the pressure switch 6 is installed on the pump head 5 .

[0035] See also Figure 3 and Figure 4 The pump head 5 is provided with a water outlet channel 51 and a water outlet cavity 52 , and the water outlet cavity 52 has a mounting cavity 53 therein.

[0036] One end of the installation cavity 53 close to the valve seat 4 has an opening 531 connected to the water outlet cavity 52, and the check valve assembly 7 is installed at the opening 531. The other end of the installation cavity 53 has a detection channel 532, and the detection channel 532 is directly connected to the detection end 61 of the pressure switch 6. The two ends of the installation cavity 53 are connected to the water outlet channel 51.

[0037] The check valve assembly 7 includes a check valve body 71 , a check elastic member 72 and a check valve seat 73 .

[0038] The check valve seat 73 is installed at the opening 531 of the installation cavity 53, and has a check hole 731 in the middle of the check valve seat 73. The outer periphery of the check hole 731 has an abutment ring 732. One side of the abutment ring 732 is pressed and sealed by the edge of the opening 531 of the installation cavity 53, while the other side abuts the valve seat 4. The abutment ring 732 also has a conducting channel 733 connecting the check hole 731 and the water outlet cavity 52 on the side close to the valve seat 4.

[0039] The check valve body 71 and the check elastic member 72 are both installed in the installation cavity 53 , and the check elastic member 72 presses against the check valve body 71 to elastically seal the check through hole 731 .

[0040] Therefore, during installation, the check elastic member 72 and the check valve body 71 can be first installed into the installation cavity 53, and then the check valve seat 73 can be set at the opening 531 of the installation cavity 53, and then the pump head 5 can be fixed to the valve seat 4, so that the check valve seat 73 can be pressed tightly by the edge of the opening 531 of the installation cavity 53 and the valve seat 4, that is, the check valve seat 73 can be fixed by assembling the pump head 5 and the valve seat 4, without the need to additionally lock or screw the check valve seat 73, so that the assembly of the check valve assembly 7 can be completed conveniently and quickly; at the same time, the detection flow channel 532 is connected to the water outlet channel 51 through the installation cavity 53, and is directly connected to the pressure The detection end 61 of the pressure switch 6, and the check valve assembly 7 can unidirectionally conduct the water outlet chamber 52 and the water outlet channel 51, so that the pressure switch 6 can directly detect the water pressure change of the water outlet channel 51, automatically and accurately control the start and stop action of the diaphragm pump, and is not affected by the water outlet chamber 52, which can effectively solve the problem of frequent jumping of the pressure switch 6 when the water outlet chamber 52 is depressurized; and the water in the detection channel 532 can directly flow into the detection end 61. When the pressure switch 6 is working, it is powered on and generates heat, and the water can play a role in cooling and dissipating heat, thereby effectively extending the service life of the pressure switch 6, increasing the service life of the diaphragm pump, and improving the reliability of the product.

[0041] In this embodiment, the pressure switch 6 takes a differential pressure switch as an example; by detecting the pressure change at the end 61, the opening and resetting of the butterfly metal diaphragm inside the differential pressure switch can be controlled, so as to control the shutdown and start-up of the water pump. The opening pressure value and the reset pressure value of the butterfly metal diaphragm can be accurately set, and the difference range between the opening pressure value and the reset pressure value can be set large. After the switch is powered off, it takes time to reset and power on, which can also slow down the frequent operation of the switch.

[0042] like Figure 5 and Figure 6As shown, the water outlet cavity 52 and the installation cavity 53 can be formed on one side of the pump head 5 close to the valve seat 4, and the detection cavity 54 connected to the detection flow channel 532 can be formed on the other side; the pressure switch 6 is installed on the other side of the pump head 5, and the detection end 61 of the pressure switch 6 is inserted and installed in the detection cavity 54 and seals the detection cavity 54. Therefore, the check valve assembly 7 and the pressure switch 6 can be installed on both sides of the pump head 5, respectively, and the check valve seat 73 of the check valve assembly 7 can be installed by the mutual locking and fixing of the pump head 5 and the valve seat 4, which is convenient for assembly, and the peripheral wall of the detection end 61 of the pressure switch 6 can be provided with multiple sealing rings 62 and then directly inserted into the detection cavity 54 for sealing installation, which is not only convenient for product assembly and can greatly improve the production and assembly efficiency, but also convenient for the mold opening and manufacturing of the pump head 5 components, and has a good waterproof sealing effect.

[0043] In this embodiment, the water outlet chamber 52 can be located in the middle of the pump head 5, and the outer periphery of the water outlet chamber 52 can be the water inlet chamber 55, the middle of the water outlet chamber 52 is the installation chamber 53, and a pressure switch cover 56 can also be provided on the pump head 5 to cover the pressure switch 6 for protection.

[0044] like Figure 3 The detection channel 532 is arranged in the side wall between the installation cavity 53 and the detection cavity 54, and includes a circular first channel 533 and a second channel 534 that are interconnected. The first channel 533 is connected to the installation cavity 53, and the second channel 534 is connected to the detection cavity 54. The aperture of the first channel 533 is larger than the aperture of the second channel 534, so as to facilitate product injection and demolding and ensure the structural strength of the product.

[0045] like Figure 6 As shown, the side of the check valve body 71 of this embodiment away from the check hole 731 has a valve stem 711; the installation cavity 53 has a guide groove 535 for the valve stem 711 to be inserted. When the check valve body 71 is lifted up by water pressure to connect the check hole 731 between the water outlet cavity 52 and the installation cavity 53, the valve stem 711 can be used to guide along the guide groove 535 to prevent the check valve body 71 from deflecting.

[0046] See also Figure 3 and Figure 4 In this embodiment, a guide column 536 may be formed inside the installation cavity 53, and the guide groove 535 is formed in the middle of the guide column 536. The non-return elastic member 72 may be a spring, and the spring may be sleeved on the guide column 536. One end of the spring may press against the side wall of one lateral end of the installation cavity 53, and the other end of the spring may press against the non-return valve body 71. The detection flow channel 532 may be arranged above the guide column 536 and be horizontally connected to the detection cavity 54. The water outlet channel 51 may be longitudinally connected to the middle of the installation cavity 53.

[0047] See also Figure 3The side of the check hole 731 close to the check valve body 71 may be an outwardly expanded conical hole 734, and the peripheral wall of the check valve body 71 may be provided with a check valve sealing ring 712. In this way, the sealing effect of the check valve body 71 on the check hole 731 is improved, ensuring the smooth operation of the pressure switch 6.

[0048] For example Figures 3 to 6 The middle part of the check valve seat 73 may have a plug-in boss 736, which may be inserted into the opening 531 of the installation cavity 53 to facilitate the pre-fixation of the check valve seat 73 during assembly, and a boss sealing ring 737 is provided on the peripheral wall of the plug-in boss 736 to facilitate installation and sealing; and the middle part of the plug-in boss 736 is the check through hole 731.

[0049] At the same time, the valve seat 4 may have a plurality of circumferentially spaced water outlets 41 on the side facing the water outlet chamber 52 of the pump head 5, and a water outlet valve plate 42 is provided at the water outlet 41; in this embodiment, the valve seat 4 is provided with 5 water outlets 41, correspondingly with 5 water outlet valve plates 42.

[0050] The side of the abutment ring 732 of the check valve seat 73 close to the valve seat 4 may have a plurality of abutment portions 738 circumferentially spaced around the check through hole 731, the number of the abutment portions 738 corresponds to the number of the outlet valve plates 42, and each abutment portion 738 abuts against each circumferentially adjacent outlet valve plates 42 on the valve seat 4, and the conducting flow channel 733 is formed between the circumferentially adjacent abutment portions 738. The plurality of conducting flow channels 733 are provided to facilitate water from the water outlet 41 of the valve seat 4 to enter the water outlet cavity 52 and then quickly enter the check through hole 731, the installation cavity 53 and the water outlet channel 51 through each conducting flow channel, thereby ensuring the water outlet flow of the diaphragm pump and reducing the influence of the abutment ring 732 on the flow.

[0051] Furthermore, the conducting flow channel 733 may have a space for the water outlet valve plate 42 to move, so that when the diaphragm pump is running, the water outlet valve plate 42 can open the water outlet 41 to discharge water.

[0052] At the same time, the pump head 5 has a plurality of abutment columns 57 protruding toward the valve seat 4 . Each abutment column 57 corresponds to each water outlet valve plate 42 and is used to press and fix the water outlet valve plate 42 .

[0053] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, equivalent changes and modifications without departing from the principle of the present invention should still belong to the protection scope of the present invention.

[0054] In the description of the embodiments of the present application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

Claims

1. A diaphragm pump for preventing a pressure switch from frequently operating, comprising a pump head, a valve seat, a pressure switch and a check valve assembly; the pump head is mounted on one side of the valve seat, and the pressure switch is mounted on the pump head; characterized in that: The pump head is provided with a water outlet channel and a water outlet cavity, and the water outlet cavity is provided with a mounting cavity; One end of the installation cavity close to the valve seat has an opening connected to the water outlet cavity, and the check valve assembly is installed at the opening. The other end of the installation cavity has a detection flow channel, which is directly connected to the detection end of the pressure switch. The two ends of the installation cavity are connected to the water outlet channel. The water outlet cavity and the installation cavity are formed on one side of the pump head close to the valve seat, and a detection cavity connected to the detection channel is formed on the other side; the pressure switch is installed on the other side of the pump head, and the detection end of the pressure switch is inserted and installed in the detection cavity to seal the detection cavity; the detection channel is arranged in the side wall between the installation cavity and the detection cavity; The check valve assembly comprises a check valve body, a check elastic member and a check valve seat; The check valve seat is installed at the opening of the installation cavity, and a check through hole is provided in the middle of the check valve seat. An abutment ring is provided on the outer periphery of the check through hole. One side of the abutment ring is pressed and sealed by the edge of the opening of the installation cavity, and the other side abuts the valve seat. The side of the abutment ring close to the valve seat also has a conducting flow channel connecting the check through hole and the water outlet cavity. The check valve body and the check elastic member are both installed in the installation cavity, and the check elastic member presses against the check valve body to elastically seal the check through hole; The side of the valve seat facing the water outlet chamber of the pump head has a plurality of water outlets arranged at circumferential intervals, and a water outlet valve plate is provided at the water outlet; the side of the abutment ring of the check valve seat close to the valve seat has a plurality of abutment parts arranged at circumferential intervals around the check through hole, the number of the abutment parts corresponds to the number of the water outlet valve plates, and each abutment part abuts between circumferentially adjacent water outlet valve plates on the valve seat, and the conducting flow channel is formed between the circumferentially adjacent abutment parts; the conducting flow channel has space for the water outlet valve plate to move.

2. A diaphragm pump for preventing frequent operation of a pressure switch according to claim 1, characterized in that: The pressure switch is a differential pressure switch.

3. A diaphragm pump for preventing frequent operation of a pressure switch according to claim 1, characterized in that: The detection flow channel comprises a first flow channel and a second flow channel which are interconnected and circular, wherein the first flow channel is connected to the installation cavity, and the second flow channel is connected to the detection cavity, and the aperture of the first flow channel is larger than the aperture of the second flow channel.

4. A diaphragm pump for preventing frequent operation of a pressure switch according to claim 1, characterized in that: The side of the check valve body away from the check through hole is provided with a valve stem; the installation cavity is provided with a guide groove for the valve stem to be inserted.

5. A diaphragm pump for preventing frequent operation of a pressure switch according to claim 1, characterized in that: The side of the check through hole close to the check valve body is an outwardly expanded tapered hole.

6. A diaphragm pump for preventing frequent operation of a pressure switch according to claim 1, characterized in that: A check valve sealing ring is arranged on the peripheral wall of the check valve body.

7. A diaphragm pump for preventing frequent operation of a pressure switch according to claim 1, characterized in that: The middle part of the check valve seat is provided with an inserting boss, which is inserted into the opening of the installation cavity, and a boss sealing ring is provided on the peripheral wall of the inserting boss; the middle part of the inserting boss is the check through hole.

8. A diaphragm pump for preventing frequent operation of a pressure switch according to claim 1, characterized in that: The pump head is provided with a plurality of abutment columns protruding toward the valve seat, each abutment column corresponding to each water outlet valve plate and used for pressing and fixing the water outlet valve plate.

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